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CN101055703A - Apparatus and method for driving backlight of liquid crystal display apparatus - Google Patents

Apparatus and method for driving backlight of liquid crystal display apparatus Download PDF

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Publication number
CN101055703A
CN101055703A CNA200610169498XA CN200610169498A CN101055703A CN 101055703 A CN101055703 A CN 101055703A CN A200610169498X A CNA200610169498X A CN A200610169498XA CN 200610169498 A CN200610169498 A CN 200610169498A CN 101055703 A CN101055703 A CN 101055703A
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China
Prior art keywords
voltage
main
feedback
driver
drive device
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Granted
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CNA200610169498XA
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Chinese (zh)
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CN101055703B (en
Inventor
李泰旭
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LG Display Co Ltd
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LG Philips LCD Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133604—Direct backlight with lamps
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/04—Display protection

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention provides a backlight driving device used for a liquid crystal display device and a method thereof. The backlight driving device of the liquid crystal display (LCD) device comprises a main transformer and an auxiliary transformer which are used for supplying current to a plurality of lamps, and a main driver and an auxiliary driver which are used for driving the lamps. The backlight driving device comprises a working state unit which converts an AC voltage which is generated by a phase difference between a main AC voltage and an auxiliary AC voltage which are respectively fed back from the main transformer and the auxiliary transformer into a simulation DC voltage, a protection controller which determines the generated errors during the working period of the lamps according to the simulation DC voltage and outputs the working error signal when the error is generated, and a lamp driving controller which responds to the working error signal to stop the driving of the main driver and the auxiliary driver.

Description

The backlight drive device of liquid crystal indicator and method
Technical field
The present invention relates to a kind of liquid crystal display (LCD) device, relate more specifically to a kind of backlight drive device and driving method thereof of LCD device, it is suitable in the mask voltage supply automatically when producing mistake of lamp duration of work.
Background technology
Usually, liquid crystal display (LCD) device is controlled the transmittance of liquid crystal cells with display image according to vision signal.The advantage of active array type LCD device is, so can realize moving image because switchgear is controlled each liquid crystal cells on one's own initiative.Thin film transistor (TFT) (hereinafter referred to as " TFT ") is mainly as the switchgear in the active array type LCD device.
Fig. 1 is the equivalent circuit diagram according to the pixel of the LCD device of prior art.
With reference to Fig. 1, this LCD is converted to analog data voltage it is supplied to data line DL based on the gamma reference voltage with digital input data, thereby supply scanning impulse to select lines GL simultaneously liquid crystal cells Clc is charged.
The grid of TFT links to each other with select lines GL, and its source electrode links to each other with data line DL.In addition, the drain electrode of TFT links to each other with the pixel electrode of liquid crystal cells Clc and the electrode of holding capacitor Cst.
The public electrode of liquid crystal cells Clc has been supplied common electric voltage Vcom.The data voltage of feeding from data line DL when holding capacitor Cst is stored in the TFT conducting is to keep this data voltage for liquid crystal cells Clc.
When select lines GL applies scanning impulse, the TFT conducting with its source electrode and the drain electrode between passage is provided, thereby the data voltage on the pixel electrode supply data line DL of liquid crystal cells Clc.The orientation of the liquid crystal molecule of liquid crystal cells changes according to the electric field that produces between pixel electrode and public electrode, thus can modulate incide the LCD device light with display image.
Structure according to the LCD device of prior art will be described below.Fig. 2 shows the block diagram according to the structure of the LCD device of prior art.
With reference to Fig. 2, LCD device 100 comprises: be provided with the LCD plate 110 of thin film transistor (TFT) (TFT), described thin film transistor (TFT) be positioned at the data line DL1 to DLm that is used for each liquid crystal cells Clc and select lines GL1 to GLn each intersect near; Data driver 120 is used for to data line DL1 to DLm supply data voltage; Gate driver 130 is used for supplying scanning impulse to select lines GL1 to GLn; Gamma pedestal generator 140 is used to generate the gamma reference voltage and they is supplied to data driver 120; Backlight assembly 150 is used for irradiates light on LCD plate 110; Inverter 160 is used for applying interchange (AC) voltage and current to backlight assembly 150; Common electric voltage generator 170 is used to generate common electric voltage Vcom and it is supplied to the public electrode of liquid crystal cells Clc; Gating driving voltage generator 180 is used to generate gating high voltage VGH and gating low-voltage VGL, and they are supplied to gate driver 130; And timing controller 190, be used for control data driver 120 and gate driver 130.
LCD plate 110 has the liquid crystal between two glass substrates.On the lower glass substrate of LCD plate 110, data line DL1 to DLm and select lines GL1 to GLn are vertically intersected with each other.Described TFT is arranged near the intersection of data line DL1 to DLm and select lines GL1 to GLn.Described TFT in response to scanning impulse from data line DL1 to DLm to liquid crystal cells Clc supply data voltage.The grid of TFT links to each other with select lines GL1 to GLn, and its source electrode links to each other with data line DL1 to DLm.In addition, the drain electrode of TFT links to each other with holding capacitor Cst with the pixel electrode of liquid crystal cells Clc.
TFT conducting in response to the scanning impulse that imposes on its gate terminal via select lines GL1 to GLn.When the TFT conducting, the data voltage on the data line DL1 to DLm just imposes on the pixel electrode of liquid crystal cells Clc.
Data driver 120 is in response to from the data drive control signal DDC of timing controller 190 and to data line DL1 to DLm supply data voltage.In addition, 120 couples of digital of digital video data RGB that feed from timing controller 190 of data driver sample and latch, based on the gamma reference voltage that generates by gamma pedestal generator 140 described digital of digital video data is converted to and can then they be supplied to data line DL1 to DLm at the analog data voltage of liquid crystal cells Clc place representing gradation level level.
Gate driver 130 is in response to from the gating drive control signal GDC of timing controller 190 and gating shift clock GSC and generate scanning impulse (strobe pulse) in turn, and they are supplied to select lines GL1 to GLn.High level voltage and low level voltage that gate driver 130 is determined scanning impulse according to gating high voltage VGH and gating low-voltage VGL from gating driving voltage generator 180.
Gamma pedestal generator 140 receives maximum level supply voltage VDD generating positive and negative gamma reference voltage, and they are exported to data driver 120.
Backlight assembly 150 is arranged on the rear side of LCD plate 110, and by from the interchange AC voltage and current of inverter 160 supply and to LCD plate 110 irradiates lights.
Inverter 160 square-wave signal that generates of portion within it is converted to triangular signal, this triangular signal is compared with direct current DC supply voltage VCC from the LCD device provisioning, then result and production burst dim signal based on the comparison.In response to this pulse light modulation signal, the drive integrated circult IC (not shown) control in the inverter 160 imposes on the AC voltage and current of backlight assembly 150.
Common electric voltage generator 170 receives high level supply voltage VDD and generates common electric voltage Vcom, and it is supplied to the public electrode of the liquid crystal cells Clc at each the pixel place that is arranged on LCD plate 110.
Gating driving voltage generator 180 has been supplied high level supply voltage VDD with generation gating high voltage VGH and gating low-voltage VGL, and they are supplied to data driver 130.Here, gating high voltage VGH is than the critical voltage height of the TFT at each the pixel place that is arranged on LCD plate 110, and gating low-voltage VGL is lower than the critical voltage of described TFT.Gating high voltage VGH of Sheng Chenging and gating low-voltage VGL are used for respectively determining the high level voltage and the low level voltage of the scanning impulse that generated by gate driver 130 by this way.
Timing controller 190 is supplied digital of digital video data RGB from the digital video adapter (not shown) to data driver 120, and simultaneously generate data drive control signal DDC and gating drive control signal GDC, and they are supplied to data driver 120 and gate driver 130 respectively in response to clock signal clk usage level/vertical synchronizing signal H and V.Here, data drive control signal DDC comprises source shift clock SSC, source enabling pulse SSP, polarity control signal POL and source output enable signal SOE etc.Gating drive control signal GDC comprises gating enabling pulse GSP and gating output enable signal GOE etc.
To be described in the structure of prior art backlight drive device included in the backlight assembly of LCD device below with said structure.
Fig. 3 shows the block diagram according to the structure of the backlight drive device of the LCD device of prior art.
With reference to Fig. 3, backlight drive device 200 comprises lamp driving governor 202, master driver 203, from driver 204, main DC/AC switching part 205, from DC/AC switching part 206, main-transformer 207 and from transformer 208.
Lamp driving governor 202 according to described pulse light modulation signal generate be used to control a plurality of lamps 201 recommend (push-pull) gating signal.
Master driver 203 and from driver 204 in response to described recommend gating signal and generate be used for described a plurality of lamp 201 draw bridge (pull-bridge) gating signal.
Main DC/AC switching part 205 will be converted to AC voltage 400Vrms from the DC high level voltage DC 400V of master driver 203 inputs according to the described bridge gating signal of drawing, and supply positive AC voltage 400Vrms and negative AC voltage 400Vrms via two signal wires to main-transformer 207.
To be converted to AC voltage 400Vrms from DC/AC switching part 206 from DC high level voltage DC 400V according to the described bridge gating signal of drawing from driver 204 input, and via two signal paths to from transformer 208 positive AC voltage 400Vrms of supply and negative AC voltage 400Vrms.Main DC/AC switching part 205 and have the AC voltage 400Vrms of same phase from DC/AC switching part 206 output.
Main-transformer 207 will boost from the AC voltage 400Vrms that main DC/AC switching part 205 is imported via two signal wires and be AC voltage 750Vrms, and it is supplied to one side of described a plurality of lamp 201.To be AC voltage 750Vrms from boosting via the AC voltage 400Vrms of two signal wires input from transformer 208, and it will be supplied to the another side of described a plurality of lamp 201 from DC/AC switching part 206.Have and the AC voltage 750Vrms opposite phases of exporting from main-transformer 207 from AC voltage 750Vrms from transformer 208 outputs.
Thereby the AC voltage 750Vrms with opposite phase is supplied to the two edges of described a plurality of lamp 201.As a result, supplied AC voltage 1500Vrms to described a plurality of lamps 201 basically.Be supplied to the size of the AC voltage of lamp 201 to change according to the type and the quantity of lamp.
As mentioned above, the backlight drive device of prior art does not have error detection function, thereby examiner or consumer may be shocked by electricity.
Summary of the invention
Therefore, the invention reside in a kind of backlight drive device and method of LCD device, it has overcome one or more problem that causes owing to the limitation of prior art and shortcoming basically.
Advantage of the present invention provides a kind of backlight drive device and driving method thereof of LCD device, and it is suitable in the mask voltage supply automatically when producing mistake of lamp duration of work.
Supplementary features of the present invention and advantage will be set forth in will illustrating below, and a part will become clear from instructions, perhaps can know by implementing the present invention.These and other advantage of the present invention can be realized by the structure of specifically noting in writing instructions and claims and accompanying drawing and obtain.
In order to realize these and other advantage and according to purpose of the present invention, such as enforcement and broadly described, the backlight drive device of a kind of liquid crystal display (LCD) device comprises and being used for to the main-transformer of a plurality of lamp supply of current with from transformer and be used to drive the master driver of described lamp and from driver, this backlight drive device comprises: the working condition unit, this working condition unit will according to respectively by described main-transformer and described be analog D C voltage from the main AC voltage of transformer feedback with from the AC voltage transitions that the phase differential between the AC voltage generates; The protection controller, this protection controller uses described analog D C voltage and determines to produce mistake at the duration of work of described lamp, and when producing mistake, the output services rub-out signal; And the lamp driving governor, this lamp driving governor stops described master driver and described driving from driver in response to described error of performance signal.
In a kind of driving method of backlight drive device of LCD device (this backlight drive device comprise be used for to the main-transformer of a plurality of lamp supply of current and from transformer and be used to drive the master driver of described lamp and from driver), the present invention includes following steps: with the described main-transformer of reason and described from transformer feedback main AC voltage and from the phase differential of AC voltage and the AC voltage transitions that generates is an analog D C voltage; By using described analog D C voltage to come the lamp of judgment task whether to produce mistake, and generate error of performance signal and enable signal according to this result; And described master driver and described driving from driver are stopped, perhaps in response to from the enable signal of described protection controller and the described master driver of driven and described from driver.Here, the present invention also comprises the steps: to be main dc voltage from the main AC voltage transitions of described main-transformer feedback, and will from described be from dc voltage from transformer feedback from the AC voltage transitions; Under the initial driving situation, use the described main dc voltage of feedback and describedly judge that from dc voltage the initial error of described lamp produces, to generate initial error signal and enable signal according to this result; And described master driver and described initial driving from driver are stopped.
In a kind of backlight drive device of LCD device, this backlight drive device comprises and being used for to the main-transformer of a plurality of lamp supply of current with from transformer and be used to drive the master driver of described lamp and from driver, the present invention includes: the Voltage Feedback device, it will be main dc voltage from the main AC voltage transitions of described main-transformer feedback that this Voltage Feedback device is used for, and be used for from described from transformer feedback from the AC voltage transitions for from dc voltage; Protection controller, this protection controller use the described main dc voltage of feedback and describedly judge the generation of the initial error of described lamp from dc voltage, and generate initial error signal and enable signal according to this result under the initial driving situation; And lamp driving governor; this lamp driving governor is used in response to from the error of performance signal of described protection controller and make described master driver and described initial driving from driver stops, perhaps in response to from the enable signal of described protection controller and the described master driver of driven and described from driver.
In a kind of driving method of backlight drive device of LCD device (this backlight drive device comprise be used for to the main-transformer of a plurality of lamp supply of current and from transformer and be used to drive the master driver of described lamp and from driver), the present invention includes following steps: will be main dc voltage from the main AC voltage transitions of described main-transformer feedback, and will from described be from dc voltage from transformer feedback from the AC voltage transitions; Under the initial driving situation, use the described main dc voltage of feedback and describedly judge the generation of the initial error of described lamp, and generate initial error signal and enable signal according to this result from dc voltage; And in response to from the initial error signal of described protection controller and make described master driver and described driving from driver stops, perhaps in response to from the enable signal of described protection controller and the described master driver of driven and described from driver.
In a kind of backlight drive device of LCD device (this backlight drive device comprise be used for to the main-transformer of a plurality of lamp supply of current and from transformer and be used to drive the master driver of described lamp and from driver), the present invention includes: working condition pick-up unit, this working condition pick-up unit be used for because of from described main-transformer and described from transformer feedback main AC voltage and be analog D C voltage from the AC voltage transitions that the phase differential of AC voltage generates; And master controller, the mistake of the lamp that this master controller is used to use described analog D C voltage to judge described work produces, and described master driver and described driving from driver are stopped according to this result, the perhaps described master driver of driven and described from driver.Here; the present invention also comprises: the Voltage Feedback device; being used for to be main dc voltage from the main AC voltage transitions of described main-transformer feedback, and be used for from described from transformer feedback from the AC voltage transitions for from dc voltage, they are exported to described protection controller.
In a kind of driving method of backlight drive device of LCD device (this backlight drive device comprise be used for to the main-transformer of a plurality of lamp supply of current and from transformer and be used to drive the master driver of described lamp and from driver), the present invention includes following steps: will because of from described main-transformer and described from transformer feedback main AC voltage and be analog D C voltage from the AC voltage transitions that the phase differential of AC voltage generates; And use described analog D C voltage to judge that the mistake of the lamp of described work produces, to stop described master driver and described driving, the perhaps described master driver of driven and described according to this result from driver from driver.
In a kind of backlight drive device of LCD device (this backlight drive device comprise be used for to the main-transformer of a plurality of lamp supply of current and from transformer and be used to drive the master driver of described lamp and from driver), the present invention includes: the Voltage Feedback device, it will be main dc voltage from the main AC voltage transitions of described main-transformer feedback that this Voltage Feedback device is used for, and be used for from described from transformer feedback from the AC voltage transitions for from dc voltage; And main control unit, this main control unit is under the initial driving situation, use the described main dc voltage and the described generation of judging the initial error of described lamp from dc voltage of feedback, so that described master driver and described initial driving from driver are stopped, the perhaps described master driver of driven and described from driver.
In a kind of driving method of backlight drive device of LCD device (this backlight drive device comprise be used for to the main-transformer of a plurality of lamp supply of current and from transformer and be used to drive the master driver of described lamp and from driver), the present invention includes following steps: will be main dc voltage from the main AC voltage transitions of described main-transformer feedback, and will from described be from dc voltage from transformer feedback from the AC voltage transitions; And under the initial driving situation, use the described main dc voltage and the described generation of judging the initial error of described lamp from dc voltage of feedback, so that described master driver and described initial driving from driver are stopped, the perhaps described master driver of driven and described from driver.
In a kind of backlight drive device of LCD device (this backlight drive device comprise be used for to the main-transformer of a plurality of lamp supply of current and from transformer and be used to drive the master driver of described lamp and from driver), the present invention includes: working condition pick-up unit, this working condition pick-up unit be used for by from described main-transformer and described from transformer feedback main AC voltage and from the phase differential of AC voltage and the AC voltage transitions that generates is an analog D C voltage; The protection controller, the mistake that this protection controller is used to use described analog D C voltage to judge described lamp of working produces, and described master driver and described driving from driver are stopped according to this result, the perhaps described master driver of driven and described from driver; And the lamp driving governor, this lamp driving governor is controlled described master driver and described output from driver according to the pulse light modulation signal of being imported.Here; the present invention also comprises: the Voltage Feedback device; being used for to be main dc voltage from the main AC voltage transitions of described main-transformer feedback, and be used for from described from transformer feedback from the AC voltage transitions for from dc voltage, they are exported to described protection controller.
In a kind of driving method of backlight drive device of LCD device (this backlight drive device comprise be used for to the main-transformer of a plurality of lamp supply of current and from transformer and be used to drive the master driver of described lamp and from driver), the present invention includes following steps: will by from described main-transformer and described from transformer feedback main AC voltage and from the phase differential of AC voltage and the AC voltage transitions that generates is an analog D C voltage; And use described analog D C voltage to judge that the mistake of described lamp of working produces, and according to this result to described master driver and described, perhaps to described master driver and described from driver supply enable signal from driver supply disable signal.Here, the present invention also comprises the steps: to be main dc voltage from the main AC voltage transitions of described main-transformer feedback, and will from described be from dc voltage from transformer feedback from the AC voltage transitions; Under the initial driving situation, use the described main dc voltage of feedback and describedly judge the generation of the initial error of described lamp, to generate initial error signal and initial normal signal according to this result from dc voltage; And described master driver and described initial driving from driver are stopped.
In a kind of backlight drive device of LCD device (this backlight drive device comprise be used for to the main-transformer of a plurality of lamp supply of current and from transformer and be used to drive the master driver of described lamp and from driver), the present invention includes: working condition pick-up unit, this working condition pick-up unit be used for by from described main-transformer and described from transformer feedback main AC voltage and from the phase differential of AC voltage and the AC voltage transitions that generates is an analog D C voltage; And main control unit, this main control unit is used for controlling described master driver and described output from driver in response to the pulse light modulation signal of being imported, and be used to use described analog D C voltage to judge the generation of the mistake of described lamp of working, and stop to drive described master driver and described from driver or the described master driver of driven and described from driver according to this result.Here, the present invention also comprises: the Voltage Feedback device, being used for to be main dc voltage from the main AC voltage transitions of described main-transformer feedback, and be used for from described from transformer feedback from the AC voltage transitions for from dc voltage, to output it to described main control unit.
In a kind of backlight drive device of LCD device (this backlight drive device comprise be used for to the main-transformer of a plurality of lamp supply of current and from transformer and be used to drive the master driver of described lamp and from driver), the present invention includes: feedback section is used for from the main AC voltage of described main-transformer output with from described feeding back from AC voltage from transformer output; And the protection controller, this protection controller uses by the main AC voltage of described feedback section feedback with from AC voltage and wrongheaded generation, and is producing when wrong, and described master driver and described driving from driver are stopped.
Should be appreciated that top all is exemplary and indicative to general introduction of the present invention and following detailed description, and aims to provide the further explanation of invention as claimed in claim.
Description of drawings
Comprise accompanying drawing providing further understanding of the present invention, it is merged in and has constituted the part of this instructions, shows embodiments of the invention, and is used from the explanation principle of the invention with this instructions one.
In the accompanying drawings:
Fig. 1 is the equivalent circuit diagram according to the pixel of the LCD device of prior art;
Fig. 2 shows the block diagram according to the structure of the LCD device of prior art;
Fig. 3 shows the block diagram according to the structure of the backlight drive device of the LCD device of prior art;
Fig. 4 shows the block diagram according to the structure of the backlight drive device of the LCD device of the embodiment of the invention;
Fig. 5 is the first main voltage divider shown in Figure 4 and the circuit diagram of the second main voltage divider;
Fig. 6 is shown in Figure 4 first from the voltage divider and second circuit diagram from voltage divider;
Fig. 7 is the circuit diagram of working condition detecting device shown in Figure 4;
Fig. 8 is the circuit diagram of main AC/DC converter shown in Figure 4;
Fig. 9 is the circuit diagram from the AC/DC converter shown in Figure 4;
Figure 10 shows the block diagram of the structure of the backlight drive device of LCD device according to another embodiment of the present invention;
Figure 11 shows the block diagram according to the structure of the backlight drive device of further embodiment of this invention;
Figure 12 produces voltage oscillogram when wrong at the duration of work according to the backlight drive device of the LCD device of further embodiment of this invention;
Figure 13 shows the block diagram of the structure of protection controller shown in Figure 11;
Figure 14 shows the block diagram according to the structure of the backlight drive device of the liquid crystal indicator of further embodiment of this invention; And
Figure 15 shows the block diagram of structure of the backlight drive device of liquid crystal indicator according to yet another embodiment of the invention.
Embodiment
To explain embodiments of the invention below, its example shown in the drawings.In institute's drawings attached, use identical Reference numeral to represent same or analogous parts.
Fig. 4 shows the block diagram of structure of the backlight drive device of liquid crystal display (LCD) device according to the embodiment of the invention.
With reference to Fig. 4, according to the backlight drive device 300 of the embodiment of the invention comprise main DC/AC switching part 205, from DC/AC switching part 206, main-transformer 207 with from transformer 208.
Backlight drive device 300 also comprises: lamp driving governor 301 is used for generating the gating signal of recommending that is used to control a plurality of lamps 201 according to the pulse light modulation signal; Master driver 302 and from driver 303, be used in response to described recommend gating signal and generate be used to drive described a plurality of lamp 201 draw the bridge gating signal; The first main voltage divider 304 and the second main voltage divider 305 are used to make from the main AC voltage decline of main-transformer 207 outputs and to it and feed back; First from voltage divider 306 and second from voltage divider 307, be used to make from descending and it is fed back from transformer 208 outputs from AC voltage; Working condition detecting device 308 is used for based on being converted to the DC wrong voltage by the first main voltage divider 304 and first from the main AC voltage of voltage divider 306 feedback and the AC wrong voltage that generates from the phase differential between the AC voltage; Main AC/DC converter 309, being used for the main AC voltage transitions by second main voltage divider 305 feedbacks is main dc voltage; With from AC/DC converter 310, be used for by second from voltage divider 307 feedback from the AC voltage transitions for from dc voltage; And protection controller 311; when being used for producing mistake during operation; use via the voltage of working condition detecting device 308 feedback to lamp driving governor 301 direct output services rub-out signals; to stop to drive master driver 302 and from driver 303; and when producing the initial driving mistake; use is directly exported the initial error signal via main AC/DC converter 309 and/or from the voltage of AC/DC converter 310 feedback to lamp driving governor 301, to stop to drive master driver 302 and from driver 303.
Lamp driving governor 301 generates according to the pulse light modulation signal and is used to control main DC/AC switching part 205 and from the gating signal of recommending of the blocked operation of DC/AC switching part 206, and this is recommended that gating signal is supplied to master driver 302 and from driver 303.When generating the initial error signals by protection controller 311 under the initial driving situation, lamp driving governor 301 is exported disable signal in response to the initial error signal, to stop master driver 302 and from the driving of driver 303.And when under working condition during by protection controller 311 generating run control signals, lamp driving governor 301 is exported disable signal in response to the error of performance signal, to stop master driver 302 and from the driving of driver 303.Here, the lamp pulse dim signal is the signal that is used to regulate the brightness of a plurality of lamps 201.
Master driver 302 is in response to the gating signal of recommending from lamp driving governor 301 input, and generate the switching that is used to control main DC/AC switching part 205 draw the bridge gating signal, and output it to main DC/AC switching part 205.When under the driving situation or under the working condition from lamp driving governor 301 when master driver 302 has been imported disable signal, master driver 302 stops to draw the generation of bridge gating signal.
From driver 303 in response to the gating signal of recommending from lamp driving governor 301 input, and generate be used to control from the switching of DC/AC switching part 206 draw the bridge gating signal, and output it to from DC/AC switching part 206.When under the driving situation or under the working condition from lamp driving governor 301 to when driver 303 has been imported disable signal, stop to draw the generation of bridge gating signal from driver 303.
The first main voltage divider 304 will drop to 12V to 13V from the main AC voltage of the 1.2KV to 1.3KV of main-transformer 207 output, and it is fed back to working condition detecting device 308.The second main voltage divider 305 will drop to 12V to 13V from the main AC voltage of the 1.2KV to 1.3KV of main-transformer 207 output, and it is fed back to main AC/DC converter 309.
First from voltage divider 306 will from from the 1.2KV to 1.3KV of transformer 208 output drop to 12V to 13V from AC voltage, and it is fed back to working condition detecting device 308.Second from voltage divider 307 will from from the 1.2KV to 1.3KV of transformer 208 output drop to 12V to 13V from AC voltage, and it is fed back to from AC/DC converter 310.
Working condition detecting device 308 will be based on being converted to the DC wrong voltage by the first main voltage divider 304 and first from the main AC voltage of voltage divider 306 feedback and the AC wrong voltage that generates from the phase differential between the AC voltage, and output it to protection controller 311.When at main AC voltage with when not having phase differential between AC voltage, working condition detecting device 308 is exported 0V basically to protection controller 311.
Main AC/DC converter 309 will be main dc voltage from the main AC voltage transitions of second main voltage divider 305 feedbacks, and output it to protection controller 311.
From AC/DC converter 310 will from second from voltage divider 307 feedback be from dc voltage from the AC voltage transitions, and output it to and protect controller 311.
Protection controller 311 will be the first digital feedback voltage and the second digital feedback voltage by main AC/DC converter 309 and the analog D C voltage transitions of feeding back from AC/DC converter 310; and the size and the benchmark initial voltage of this first digital feedback voltage and the second digital feedback voltage compared, whether wrong under the initial driving situation to judge.When the size of digital feedback voltage was identical with the benchmark initial voltage, protection controller 311 just determined that the initial driving situations are normal and to lamp driving governor 301 output enable signals.When described size differed from one another, protection controller 311 was just determined under the initial driving situation wrong, and to lamp driving governor 301 output initial error signals.
Whether protection controller 311 will be a digital feedback voltage by the analog D C voltage transitions of working condition detecting device 308 feedbacks also, and the size and the benchmark job voltage of this digital feedback voltage is compared, wrong to determine under working condition.When the size of digital feedback voltage was identical with the benchmark initial voltage, protection controller 311 just determined that working conditions are normal and to lamp driving governor 301 output enable signals.When described size differed from one another, protection controller 311 was just determined under working condition wrong, and to lamp driving governor 301 output services rub-out signals.Here, when working condition just often because by the first main voltage divider 304 with first from the main AC voltage of voltage divider 306 feedback with identical, so working condition detecting device 308 is essentially the voltage of 0V to 311 outputs of protection controller from the phase place of AC voltage.On the other hand; when producing mistake during operation; because by the first main voltage divider 304 and first from the main AC voltage of voltage divider 306 feedback with from the phase differential between the AC voltage; so working condition detecting device 308 will be converted to the DC wrong voltage by the main AC voltage of feedback and the AC wrong voltage that produces from the phase differential between the AC voltage in the middle of work, and will output it to protection controller 311.In other words, protection controller 311 will be converted to numeric error voltage by the analog D C wrong voltage of working condition detecting device 308 conversions, and compare to judge whether benchmark job voltage and this numeric error voltage wrong.
As mentioned above, when when the duration of work according to backlight drive device of the present invention produces mistake, protection controller 311 uses feedback voltages and detects wrong generation, then the error of performance signal is exported to lamp driving governor 301.Lamp driving governor 301 is exported disable signal in response to this error of performance signal then, to stop to drive master driver 302 and from driver 303.
Backlight drive device according to the present invention detects mistake during operation, protects controller 311 to stop to drive master driver 302 then and from driver 303.Therefore, can minimize or prevent infringement, for example electric shock to the examiner.
Fig. 5 is the first main voltage divider shown in Figure 4 and the circuit diagram of the second main voltage divider.
With reference to Fig. 5, the first main voltage divider 304 comprises the output that is connected in series in main-transformer 207 and capacitor C1 and the C2 between the ground.Be transferred to working condition detecting device 308 by the voltage that capacitor C1 and C2 distributed via the node between capacitor C1 and C2.
The second main voltage divider 305 comprises the output that is connected in series in main-transformer 207 and capacitor C3 and the C4 between the ground.Capacitor C3 and C4 and capacitor C1 and C2 are connected in parallel.Be transferred to main AC/DC converter 309 by the voltage that capacitor C3 and C4 distributed via the node between capacitor C3 and C4.
Fig. 6 is shown in Figure 4 first from the voltage divider and second circuit diagram from voltage divider.
With reference to Fig. 6, first comprises from voltage divider 306 and to be connected in series in from the output of transformer 208 and capacitor C5 and C6 between the ground.Be transferred to working condition detecting device 308 by the voltage that capacitor C5 and C6 distributed via the node between capacitor C5 and C6.
Second comprises from voltage divider 307 and to be connected in series in from the output of transformer 208 and capacitor C7 and C8 between the ground.Capacitor C7 and C8 and capacitor C5 and C6 are connected in parallel.The voltage that is distributed by capacitor C7 and C8 is transferred to from AC/DC converter 310 via the node between capacitor C7 and C8.
Fig. 7 is the circuit diagram of working condition detecting device shown in Figure 4.
With reference to Fig. 7, working condition detecting device 308 comprises the resistor R 1 that links to each other with the output of the first main voltage divider 304, with first resistor R 2 that links to each other from the output of voltage divider 306, be connected resistor R 3 between resistor R 1 and R2 and the ground, be connected resistor R 4 between protection controller 311 and the resistor R 1, be connected the resistor R of protecting between controller 311 and resistor R 4 and the ground 5.Working condition detecting device 308 also comprises and is connected the capacitor C9 between resistor R 1 and R4 and the ground and is connected capacitor C10 between protection controller 311 and resistor R 4 and the ground.Capacitor C9 and resistor R 3 are connected in parallel, and C10 and resistor R 5 are connected in parallel.
Fig. 8 is the circuit diagram of main AC/DC converter shown in Figure 4.
With reference to Fig. 8, main AC/DC converter 309 comprises: diode D1, and wherein anode links to each other with the output of the second main voltage divider 305, and negative electrode links to each other with protection controller 311; Diode D2, wherein anode links to each other with ground, and negative electrode links to each other with the negative electrode of diode D1; Resistor R 6, it is connected between the negative electrode and protection controller 311 and ground of diode D1; And capacitor C11, it is connected between the negative electrode and protection controller 311 and ground of diode D1.C11 also is connected in parallel with resistor R 6.And the negative electrode of diode D2 links to each other with diode D1, and R6 and diode D2 are connected in parallel.
Fig. 9 is the circuit diagram from the AC/DC converter shown in Figure 4.
With reference to Fig. 9, comprise from AC/DC converter 310: diode D3, wherein anode links to each other with second output from voltage divider 307, and negative electrode links to each other with protection controller 311; Diode D4, wherein anode links to each other with ground, and negative electrode links to each other with the negative electrode of diode D3; Resistor R 7, it is connected between the negative electrode and protection controller 311 and ground of diode D3; And capacitor C12, it is connected between the negative electrode and protection controller 311 and ground of diode D3.C12 also is connected in parallel with resistor R 7.And the negative electrode of diode D4 links to each other with diode D3, and R7 and diode D4 are connected in parallel.
Figure 10 shows the block diagram of the structure of the backlight drive device of LCD device according to another embodiment of the present invention.
With reference to Figure 10, backlight drive device 400 is to comprise with backlight drive device 300 similarities shown in Fig. 4: main DC/AC switching part 205, from DC/AC switching part 206, main-transformer 207, from transformer 208, master driver 302, from driver 303, the first main voltage divider 304 and the second main voltage divider 305, first from voltage divider 306 and second from voltage divider 307, working condition detecting device 308, main AC/DC converter 309 and from AC/DC converter 310.
Backlight drive device 400 also comprises master controller 410, be used for generating the gating signal of recommending that is used to control a plurality of lamps 201 according to the pulse light modulation signal, and be used for judging this wrong error of performance signal producing during operation to use when wrong to generate via the voltage of working condition detecting device 308 feedbacks, stop with indication master driver 302 with from the driving of driver 303, and be used for when producing the initial driving mistake, using generating and judge this wrong initial error signal, stop with indication master driver 302 with from the driving of driver 303 via main AC/DC converter 309 and/or from the voltage of AC/DC converter 310 feedbacks.
Lamp driving governor 301 shown in Fig. 4 and protection controller 311 are implemented as the master controller 410 of single-chip, and its function is as follows.
Master controller 410 generates according to the lamp pulse dim signal and is used to control main DC/AC switching part 205 and from the gating signal of recommending of the blocked operation of DC/AC switching part, and it is supplied to master driver 302 and from driver 303.
Master controller 410 will be the first digital feedback voltage and the second digital feedback voltage by main AC/DC converter 309 and the analog D C voltage transitions of feeding back from AC/DC converter 310, and the size and the benchmark initial voltage of this first digital feedback voltage and the second digital feedback voltage compared, whether wrong under the initial driving situation to judge.When the size of digital feedback voltage was identical with the benchmark initial voltage, master controller 410 was just judged the normal and output enable signal of initial driving situation.When described size differed from one another, master controller 410 produced wrong under the initial driving situation and output initial error signal with regard to judging.
Whether master controller 410 will be a digital feedback voltage by the analog D C voltage transitions of working condition detecting device 308 feedbacks, and the size and the benchmark job voltage of this digital feedback voltage is compared, wrong under working condition to judge.When the size of digital feedback voltage was identical with the benchmark initial voltage, master controller 410 is normal and output enable signal with regard to the judgment task situation.When described size differed from one another, master controller 410 produced mistake and the output services rub-out signal with regard to judging under working condition.In other words, whether master controller 410 will be converted to numeric error voltage by the analog D C wrong voltage of working condition detecting device 308 conversions, and compare to judge benchmark job voltage and this numeric error voltage wrong during operation.
If generate the initial error signal under the initial driving situation, then master controller 410 is exported disable signal in response to the initial error signal, to stop to drive master driver 302 and from driver 303.And if generate the error of performance signal under working condition, then master controller 410 is exported disable signal in response to the error of performance signal, to stop to drive master driver 302 and from driver 303.
As mentioned above, in backlight drive device 400 according to another embodiment of the present invention, if produce mistake during operation, then master controller 410 uses feedback voltages and detects the generation of duration of work mistake, exports disable signal then to stop to drive master driver 302 and from driver 303.
Figure 11 shows the block diagram according to the structure of the backlight drive device of further embodiment of this invention.
With reference to Figure 11, backlight drive device 500 is to comprise with backlight drive device 300 similarities shown in Fig. 4: main DC/AC switching part 205, from DC/AC switching part 206, main-transformer 207, from transformer 208, master driver 302, from driver 303, the first main voltage divider 304 and the second main voltage divider 305, first from voltage divider 306 and second from voltage divider 307, working condition detecting device 308, main AC/DC converter 309 and from AC/DC converter 310.
Backlight drive device 500 also comprises: lamp driving governor 510 is used for generating the gating signal of recommending that is used to control a plurality of lamps 201 according to the pulse light modulation signal; And protection controller 520; be used for when producing mistake, using via the voltage of working condition detecting device 308 feedbacks the directly error of performance signal of output judgement mistake during operation; stop with indication master driver 302 with from the driving of driver 303; and be used for exporting the initial error signal of judging the initial driving mistake producing to use when wrong, to stop to lamp driving governor 510 indication master drivers 302 with from the driving of driver 303 via main AC/DC converter 309 with from the voltage of AC/DC converter 310 feedbacks.
Lamp driving governor 510 generates according to the pulse light modulation signal and is used to control main DC/AC switching part 205 and from the gating signal of recommending of the blocked operation of DC/AC switching part 206, and this is recommended that gating signal is supplied to master driver 302 and from driver 303.When generating the initial error signals by protection controller 520 under the initial driving situation, lamp driving governor 510 is exported disable signal in response to this initial error signal, to stop master driver 302 and from the driving of driver 303.
Under the initial driving situation to the input of protection controller 520 via the main dc voltage of simulation of main AC/DC converter 309 feedbacks and via from the simulation of AC/DC converter 310 feedbacks from dc voltage; the main dc voltage of the simulation of protecting controller 520 to feed back then is converted to the first digital feedback voltage; whether and the simulation that will feed back is converted to the second digital feedback voltage from dc voltage, and compare to judge the size and the benchmark initial voltage of this first digital feedback voltage and the second digital feedback voltage wrong in initial operation.When the size of digital feedback voltage was identical with the benchmark initial voltage, protection controller 520 just judged that initial operation is normal, and controls lamp driving governor 510 in the mode that can drive lamp 201 continuously.When described size differed from one another, protection controller 520 just judged that initial operation produces mistake, and to lamp driving governor 510 output initial error signals.If generate the initial error signal, then lamp driving governor 510 in response to this initial error signal to master driver 302 with from driver 303 output disable signal, to stop master driver 302 and from the operation of driver 303.
The main dc voltage of simulation that under working condition, feeds back via working condition detecting device 308 to 520 inputs of protection controller; protect controller 520 that the size and the benchmark initial voltage of feedback voltage are compared then, with according to the result to master driver 302 with from driver 303 output enable signal or disable signal.When the size of feedback voltage was identical with the benchmark initial voltage, protection controller 520 generated enable signals to output it to master driver 302 and from driver 303.When described size differed from one another, protection controller 520 just generated disable signal to output it to master driver 302 and from driver 303.If from protection controller 520 input disable signal, then make master driver 302 and stop from the operation of driver 303 by this disable signal.
Master driver 302 is drawn the bridge gating signal in response to what generate the switching that is used to control main DC/AC switching part 205 from the recommending gating signal of lamp driving governor 510 input, to output it to main DC/AC switching part 205.When under the initial driving situation from lamp driving governor 510 during to master driver 302 input disable signal, master driver 302 just stops to draw the generation of bridge gating signal.When under working condition from protection controller 520 during to master driver 302 input disable signal, master driver 302 just stops to draw the generation of bridge gating signal.On the other hand, when under working condition from protection controller 520 during to master driver 302 input enable signals, master driver 302 is just drawn the bridge gating signal in response to generating from lamp driving governor 510 the recommending gating signal of input.
From driver 303 in response to generate from the recommending gating signal of lamp driving governor 510 input be used to control from the switching of DC/AC switching part 206 draw the bridge gating signal, to output it to from DC/AC switching part 206.When under the initial driving situation from lamp driving governor 510 to from driver 303 input disable signal the time, just stop to draw the generation of bridge gating signal from driver 303.And when under working condition from protection controller 520 to from driver 303 input disable signal the time, just stop to draw the generation of bridge gating signal from driver 303.On the other hand, when under working condition from protection controller 520 to from driver 303 input enable signals the time, just draw the bridge gating signal from driver 303 in response to generating from lamp driving governor 510 the recommending gating signal of input.
As mentioned above; if the duration of work at backlight drive device 500 produces mistake; then protect controller 520 just directly to export disable signal to master driver 302 with from driver 303; so that its driving stops, thereby backlight drive device 500 produces point to master driver 302 with spent time of about 10 μ s from the driving halt of driver 303 from the mistake of duration of work.Therefore, backlight drive device 500 has reduced the high voltage duration of may cause damage to the examiner (for example, shocking by electricity etc.) basically, as shown in figure 12.
Lamp driving governor 510 and protection controller 520 can be implemented as single chip.
Figure 13 shows the block diagram of the structure of protection controller shown in Figure 11.
With reference to Figure 13, protection controller 520 comprises: A/D converter 521, and being used under the initial driving situation to be the first digital feedback voltage and the second digital feedback voltage via main AC/DC converter 309 and the analog D C voltage transitions of feeding back from AC/DC converter 310; Mistake sensor 522, be used for the size and the benchmark initial voltage of the first digital feedback voltage and the second digital feedback voltage are compared, to represent normal initial normal signal of initial operations or initial error signals to 510 outputs of lamp driving governor according to this result; And comparer 523, be used under working condition and will compare via the size and the benchmark job voltage of the analog D C voltage of working condition detecting device 308 feedbacks, with according to this result to master driver 302 with from driver 303 output enable signal or disable signal.
If under the initial driving situation to A/D converter 521 input via the main dc voltage of simulation of main AC/DC converter 309 feedbacks and via from the simulation of AC/DC converter 310 feedbacks from dc voltage, then the A/D converter 521 main dc voltage of simulation that will feed back is converted to the first digital feedback voltage, and the simulation that will feed back is converted to the second digital feedback voltage from dc voltage, they are exported to wrong sensor 522.Here, A/D converter 521 is exported the first digital feedback voltage and the second digital feedback voltage in turn, and sets the output order with the hardware system method.For example, A/D converter 521 is at first exported the first digital feedback voltage to an input terminal input of two input terminals, exports the second digital feedback voltage to another input terminal input then.
Mistake sensor 522 will be compared with the benchmark initial voltage by the first digital feedback voltage and the second digital feedback voltage of A/D converter 521 conversion, to judge the mistake generation of initial operation.When the size of the first digital feedback voltage and the second digital feedback voltage was identical with the benchmark initial voltage, mistake sensor 522 was normal and to the initial normal signal of lamp driving governor 510 outputs with regard to judging initial operation.When described size differed from one another, mistake sensor 522 just judged that the mistake of initial operation produces, and to lamp driving governor 510 output initial error signals.
Comparer 523 has benchmark job voltage by non-inverting input (+) input, and by reversed input terminal (-) input feedback voltage, to export disable signal and enable signals to the master driver 302 that links to each other with lead-out terminal with from driver 303.
If under working condition, imported the analog D C voltage that feeds back via working condition detecting device 308 to non-inverting input (+), and to reversed input terminal (-) input reference operating voltage, then comparer 523 compares the size and the benchmark job voltage of feedback voltage, with according to this result to master driver 302 with from driver 303 output enable signal or disable signal.When described size was identical, comparer 523 generated enable signals to output it to master driver 302 and from driver 303.When described size differed from one another, comparer 523 generated disable signal to export master driver 302 to and from driver 303.
As mentioned above, the present invention produces mask voltage supply automatically when wrong at the lamp duration of work of liquid crystal indicator, thereby can minimize or prevent the infringement to the examiner that causes because of mistake.
In addition, the present invention has significantly reduced the time interval that produces wrong shielding point to the voltage supply from the lamp work of liquid crystal indicator, thereby can minimize or prevent high voltage to the infringement that the examiner caused, and for example shocks by electricity.
Figure 14 shows the block diagram according to the structure of the backlight drive device of the liquid crystal indicator of further embodiment of this invention.
With reference to Figure 14, backlight drive device 600 is to comprise with backlight drive device 500 similarities shown in Figure 11: master driver 302, from driver 303, main DC/AC switching part 205, from DC/AC switching part 206, main-transformer 207 and from transformer 208.
Backlight drive device 600 comprises: lamp driving governor 610 is used for controlling master driver 302 and from driver 303 according to the pulse light modulation signal of input; Feedback section 620 is used for from the main AC voltage of main-transformer 207 output with from feeding back from AC voltage from transformer 208 outputs; And protection controller 630, be used to use by the main AC voltage of feedback section 620 feedbacks with from AC voltage and detect wrong generation, to stop master driver 302 when wrong and from the driving of driver 303 producing.
620 pairs of master drivers 302 of feedback section and feed back from the output voltage of driver 303, and can realize feedback method in many ways.And the driving method of protection controller 630 is according to the feedback method of feedback section 620 and difference.
At first, will the situation that realize feedback section 620 by first kind of feedback method be described.
Feedback section 620 makes from the main AC voltage decline of main-transformer 207 outputs and to it and feeds back, and make from feeding back from the decline of AC voltage and to it from transformer 208 outputs under initial situation.Here, the main AC voltage transitions that feedback section 620 will be fed back is the main dc voltage of feedback, and will feed back from the AC voltage transitions for feedback from dc voltage, protect controller 630 so that they are fed back to.Specifically, feedback section 620 is fed back main dc voltages and is fed back from dc voltage to 630 outputs of protection controller in turn under initial situation.
Feedback section 620 is under working condition; make from the main AC voltage of main-transformer 207 feedback and descend and make from descending from transformer 208 feedbacks from AC voltage; to be analog D C voltage by the main AC voltage of feedback and the simulation AC voltage transitions that produces from the phase differential between the AC voltage then, it is exported to protection controller 630.Here, when at the main AC voltage of feedback with when not having phase differential between AC voltage, feedback section 620 is because the main AC voltage of feedback and have the opposite phases relation thereby export roughly 0V to protection controller 630 from AC voltage.
Whether protection controller 630 will be a digital feedback voltage via the analog D C voltage transitions of feedback section 620 feedbacks under initial situation, and compare to judge the size and the digital feedback voltage of benchmark initial voltage wrong under the initial driving situation.When the size of benchmark initial voltage was identical with digital feedback voltage, protection controller 630 just judged that the initial driving situation is normal, and to master driver 302 with from driver 303 output enable signals.When described size differed from one another, protection controller 630 just judgement produced mistake under initial situation, and to master driver 302 with from driver 303 output disable signal.
Whether protection controller 630 will be digital AC voltage via the analog D C voltage transitions of feedback section 620 feedbacks under working condition, and compare to judge the size and the digital AC voltage of benchmark initial voltage wrong under working condition.When the size of benchmark initial voltage was identical with digital AC voltage, protection controller 630 was normal with regard to the judgment task situation, and to master driver 302 with from driver 303 output enable signals.When described size differed from one another, protection controller 630 just judgement produced mistake under working condition, and to master driver 302 with from driver 303 output disable signal.
Next, will the situation that realize feedback section 620 by second kind of feedback method be described.
Feedback section 620 makes from the main AC voltage decline of main-transformer 207 outputs and to it and feeds back, and make from feeding back from the decline of AC voltage and to it from transformer 208 outputs under working condition.Here, feedback section 620 will be fed back main AC voltage transitions and be the main dc voltage of feedback, and will feed back from the AC voltage transitions for feeding back from dc voltage, they are fed back to protection controller 630.Specifically, feedback section 620 is fed back main dc voltages and is fed back from dc voltage to 630 outputs of protection controller in turn under working condition.
And; feedback section 620 is under initial situation; make from the main AC voltage of main-transformer 207 feedback and descend and make from descending from transformer 208 feedbacks from AC voltage; to be analog D C voltage by the main AC voltage of feedback and the simulation AC voltage transitions that produces from the phase differential between the AC voltage then, it is exported to protection controller 630.Here, when at the main AC voltage of feedback with when not having phase differential between AC voltage, feedback section 620 is because the main AC voltage of feedback and have the opposite phases relation and export roughly 0V to protection controller 630 from AC voltage.
Whether protection controller 630 will be a digital feedback voltage via the analog D C voltage transitions of feedback section 620 feedbacks under working condition, and compare to judge the size and the digital feedback voltage of benchmark job voltage wrong under working condition.When the size of benchmark job voltage was identical with digital feedback voltage, protection controller 630 was normal with regard to the judgment task situation, and to master driver 302 with from driver 303 output enable signals.When described size differed from one another, protection controller 630 just judgement produced mistake under working condition, and to master driver 302 with from driver 303 output disable signal.
Whether protection controller 630 will be digital AC voltage via the analog D C voltage transitions of feedback section 620 feedbacks under initial situation, and compare to judge the size and the digital AC voltage of benchmark initial voltage wrong under initial situation.When the size of benchmark initial voltage was identical with digital AC voltage, protection controller 630 just judged that initial situation is normal, and to master driver 302 with from driver 303 output enable signals.When described size differed from one another, protection controller 630 just judgement produced mistake under initial situation, and to master driver 302 with from driver 303 output disable signal.
Whether on the other hand, protection controller 630 can be implemented by this way, that is, the size of analog D C voltage and the reference voltage that feeds back via feedback section 620 are compared, thereby judge wrong under initial situation or working condition.In this case, protecting controller 630 not carry out is the processing of digital voltage with the analog D C voltage transitions of feeding back wherein.
Figure 15 shows the block diagram of the backlight drive device of liquid crystal indicator according to yet another embodiment of the invention.
With reference to Figure 15, backlight drive device 700 is to comprise with the similarity of the backlight drive device 500 shown in Figure 11: master driver 302, from driver 303, main DC/AC switching part 205, from DC/AC switching part 206, main-transformer 207 and from transformer 208.
Backlight drive device 700 also comprises: lamp driving governor 710 is used for controlling master driver 302 and from driver 303 according to the pulse light modulation signal of input; Feedback section 720 is used for from the main AC voltage of main-transformer 207 output with from feeding back from AC voltage from transformer 208 outputs; And protection controller 730, be used to use by the main AC voltage of feedback section 720 feedbacks with from AC voltage and come wrongheaded generation, to produce when wrong, stop master driver 302 and from the driving of driver 303.
720 pairs of master drivers 302 of feedback section and feed back from the output voltage of driver 303, and can realize feedback method in many ways.And the driving method of protection controller 730 is according to the feedback method of feedback section 720 and difference.
At first, will the situation that be realized feedback section 720 by the third feedback method be described.
Feedback section 720 makes from the main AC voltage decline of main-transformer 207 outputs and to it and feeds back, and make from feeding back from the decline of AC voltage and to it from transformer 208 outputs under initial situation or working condition.Here, the main AC voltage transitions that feedback section 720 will be fed back is the main dc voltage of feedback, and will feed back from the AC voltage transitions for feedback from dc voltage, protect controller 730 so that they are fed back to.Specifically, feedback section 720 in turn to the main dc voltage of protection controller 730 output feedback and feedback from dc voltage.
Whether protection controller 730 will be a digital feedback voltage via the analog D C voltage transitions of feedback section 720 feedbacks under initial situation or working condition, and compare to judge the size and the digital feedback voltage of reference voltage wrong under initial situation or working condition.When the size of reference voltage was identical with digital feedback voltage, protection controller 730 just judged that initial situation or working condition are normal, and to master driver 302 with from driver 303 output enable signals.When described size differed from one another, protection controller 730 just judgement had produced mistake under initial situation or working condition, and to master driver 302 with from driver 303 output disable signal.
Next, will the situation that realize feedback section 720 by the 4th kind of feedback method be described.
Feedback section 720 is under initial situation or working condition; make from the main AC voltage of main-transformer 207 feedbacks and descend; and make from descending from transformer 208 feedbacks from AC voltage; to be analog D C voltage by the main AC voltage of feedback and the simulation AC voltage transitions that produces from the phase differential between the AC voltage then, it is exported to protection controller 730.Here, when at the main AC voltage of feedback with when not having phase differential between AC voltage, feedback section 720 is because the main AC voltage of feedback and have the opposite phases relation and export roughly 0V to protection controller 730 from AC voltage.
Whether protection controller 730 will be digital AC voltage via the analog D C voltage transitions of feedback section 720 feedbacks under initial situation or working condition, and compare to judge the size and the digital AC voltage of reference voltage wrong under initial situation or working condition.When the size of reference voltage was identical with digital feedback voltage, protection controller 730 just judged that initial situation or working condition are normal, with to master driver 302 with from driver 303 output enable signals.When described size differed from one another, protection controller 730 just judgement produced mistake under initial situation or working condition, to export disable signal to master driver 302 with from driver 303.
Whether protection controller 730 can be implemented by this way, that is, the size of analog D C voltage and the reference voltage that feeds back via feedback section 720 are compared, thereby judge wrong under initial situation or working condition.In this case, protecting controller 730 not carry out is the processing of digital voltage with the analog D C voltage transitions of feeding back wherein.
As mentioned above, the present invention uses the main AC voltage of feedback and detects the initial driving mistake from AC voltage.According to principle of the present invention, the main AC voltage of feedback and any from AC voltage can be used for detecting the initial driving mistake.
It will be apparent to one skilled in the art that and under the situation that does not break away from the spirit or scope of the present invention, to make various modifications and variations the present invention.Thereby the present invention is intended to cover described modification of the present invention and modification, as long as they drop in the scope of claims and equivalent thereof.
The application requires the korean patent application No.P2006-0033604 that submits to April in 2006 13 and the right of priority of the korean patent application No.P2006-0108859 that submits on November 6th, 2006, by reference it is incorporated into, be used for all purposes, as proposing fully here.

Claims (100)

1, a kind of backlight drive device of liquid crystal indicator, this backlight drive device comprise and being used for to the main-transformer of a plurality of lamp supply of current with from transformer and be used to drive the master driver of described lamp and from driver, this backlight drive device comprises:
The working condition unit, this working condition unit will according to respectively from described main-transformer and described be analog D C voltage from the main AC voltage of transformer feedback with from the AC voltage transitions that the phase differential between the AC voltage generates;
The protection controller, this protection controller uses described analog D C voltage and determines to produce mistake at the duration of work of described lamp, and when producing mistake, the output services rub-out signal; And
The lamp driving governor, this lamp driving governor stops described master driver and described driving from driver in response to described error of performance signal.
2, backlight drive device according to claim 1, wherein, described working condition unit comprises:
The first main voltage divider is used to make from the described main AC voltage decline of described main-transformer output and to it and feeds back;
First from voltage divider, is used to make from described feed back from the decline of AC voltage and to it from the described of transformer output; And
The working condition detecting device, the AC voltage transitions that is used for generating according to described main AC voltage and described phase differential between AC voltage because of feedback is described analog D C voltage, to output it to described protection controller.
3, backlight drive device according to claim 2; wherein; whether described protection controller is a digital feedback voltage with described simulation AC voltage transitions, and the size and the described digital feedback voltage of benchmark job voltage is compared, wrong to determine under working condition.
4, backlight drive device according to claim 3; wherein; when the size of described benchmark job voltage and described digital feedback voltage big or small identical, described protection controller just determines that working condition is normal and to described lamp driving governor output enable signal.
5, backlight drive device according to claim 3, wherein, when described size differed from one another, described protection controller was just determined to produce mistake at the duration of work of described lamp, and exports described error of performance signal to described lamp driving governor.
6, backlight drive device according to claim 1, this backlight drive device also comprises:
The Voltage Feedback device, being used for to be main dc voltage from the main AC voltage transitions of described main-transformer feedback, and be used for from described from transformer feedback from the AC voltage transitions for from dc voltage, they being exported to described protection controller, and
Wherein, described protection controller uses described main AC voltage and describedly defines the initial driving mistake from dc voltage, and
Wherein, described lamp driving governor is according to definite described master driver and described from driver of controlling of described protection controller.
7, backlight drive device according to claim 6, wherein, described Voltage Feedback device comprises:
The second main voltage divider is used to make from the described main AC voltage decline of described main-transformer output and to it and feeds back;
Second from voltage divider, is used to make from described feed back from the decline of AC voltage and to it from the described of transformer output;
Main AC/DC converter, being used for the main AC voltage transitions via the described second main voltage divider feedback is described main dc voltage, to output it to described protection controller; And
Main AC/DC converter, being used for the main AC voltage transitions via the described second main voltage divider feedback is described main dc voltage, to output it to described protection controller.
8, backlight drive device according to claim 7; wherein; the described main dc voltage that described protection controller will feed back and describedly be converted to the first digital feedback voltage and the second digital feedback voltage from dc voltage; and the size of benchmark initial voltage and the size of described first digital feedback voltage and the described second digital feedback voltage compared, to have determined whether the initial driving mistake.
9, backlight drive device according to claim 8; wherein; when the size of described benchmark initial voltage and the described first digital feedback voltage and the second digital feedback voltage big or small identical, described protection controller just determines that the initial driving situation is normal and to described lamp driving governor output enable signal.
10, backlight drive device according to claim 8, wherein, when described size differed from one another, described protection controller just defined the initial driving mistake, and to described lamp driving governor output initial error signal.
11, backlight drive device according to claim 10, wherein, described lamp driving governor stops described master driver and described initial driving from driver in response to described initial error signal.
12, backlight drive device according to claim 1, wherein, described protection controller and described lamp driving governor are implemented as single chip.
13, a kind of driving method backlight of liquid crystal indicator, this is backlight to comprise and being used for to the main-transformer of a plurality of lamp supply of current with from transformer and be used to drive the master driver of described lamp and from driver, this method comprises the steps:
Will because of from described main-transformer and described from transformer feedback main AC voltage and be analog D C voltage from the AC voltage transitions that the phase differential of AC voltage generates;
By using described analog D C voltage to come the lamp of judgment task whether to produce mistake, and generate error of performance signal and enable signal according to this result; And
In response to from the error of performance signal of described protection controller and stop described master driver and described driving, perhaps in response to from the enable signal of described protection controller and the described master driver of driven and described from driver from driver.
14, backlight driving method according to claim 13, wherein, the described step that voltage is changed comprises the steps:
Make from the described main AC voltage decline of described main-transformer output and to it and feed back;
Make from described and feed back from the decline of AC voltage and to it from the described of transformer output; And
The AC voltage transitions that will generate because of the described main AC voltage and the described phase differential between AC voltage of feedback is described analog D C voltage.
15, backlight driving method according to claim 14, wherein, the step of described generation signal is a digital feedback voltage with described simulation AC voltage transitions under the working condition of described lamp, and benchmark job voltage and described digital feedback voltage compared, whether wrong to determine under working condition in the step of described generation signal.
16, backlight driving method according to claim 15, wherein, when the size of described benchmark job voltage and described digital feedback voltage big or small identical, described backlight drive device is just determined normal working condition, and generates described enable signal.
17, backlight driving method according to claim 15, wherein, when described size differed from one another, described backlight drive device was just determined to produce mistake at described duration of work, and exports described error of performance signal.
18, backlight driving method according to claim 13, described method also comprises the steps:
To be main dc voltage from the main AC voltage transitions of described main-transformer feedback, and will from described be from dc voltage from transformer feedback from the AC voltage transitions;
Under the initial driving situation, use the described main dc voltage of feedback and describedly judge that from dc voltage the initial error of described lamp produces, to generate initial error signal or enable signal according to this result; And
Stop described master driver and described initial driving in response to described initial error signal from driver.
19, backlight driving method according to claim 18, wherein, the described step that voltage is changed comprises the steps:
Make from the described main AC voltage decline of described main-transformer output and to it and feed back;
Make from described and feed back from the decline of AC voltage and to it from the described of transformer output;
To be described main dc voltage via the main AC voltage transitions of the described second main voltage divider feedback; And
To be described from voltage divider feedback from the AC voltage transitions via described second from dc voltage.
20, backlight driving method according to claim 19, wherein, in the described step that generates initial error signal or enable signal, the described main dc voltage that described backlight drive device will feed back and describedly be converted to the first digital feedback voltage and the second digital feedback voltage from dc voltage, and the size of described benchmark initial voltage and the described first digital feedback voltage and the described second digital feedback voltage compared, to determine whether the initial driving mistake is arranged under the initial driving situation.
21, backlight driving method according to claim 20, wherein, when the size of described benchmark initial voltage was identical with the described second digital feedback voltage with the described first digital feedback voltage, described backlight drive device was just determined that the initial driving situation is normal and is exported described enable signal.
22, backlight driving method according to claim 20, wherein, when described size differed from one another, described backlight drive device generated described initial error signal with regard to determining to produce wrong under the initial driving situation.
23, a kind of backlight drive device of liquid crystal indicator, this backlight drive device comprise and being used for to the main-transformer of a plurality of lamp supply of current with from transformer and be used to drive the master driver of described lamp and from driver, this backlight drive device comprises:
It will be main dc voltage from the main AC voltage transitions of described main-transformer feedback that Voltage Feedback device, this Voltage Feedback device are used for, and be used for from described from transformer feedback from the AC voltage transitions for from dc voltage;
Protection controller, this protection controller use the described main dc voltage of feedback and describedly judge the generation of the initial error of described lamp from dc voltage, and generate initial error signal and enable signal according to this result under the initial driving situation; And
The lamp driving governor; this lamp driving governor is used in response to from the initial error signal of described protection controller and stop described master driver and described initial driving from driver, perhaps in response to from the enable signal of described protection controller and the described master driver of driven and described from driver.
24, backlight drive device according to claim 23, wherein, described Voltage Feedback device comprises:
The second main voltage divider is used to make from the described main AC voltage decline of described main-transformer output and to it and feeds back;
Second from voltage divider, is used to make from described feed back from the decline of AC voltage and to it from the described of transformer output;
Main AC/DC converter, being used for the main AC voltage transitions via the described second main voltage divider feedback is described main dc voltage, to output it to described protection controller; And
Main AC/DC converter, be used for via described second from voltage divider feedback be described from the AC voltage transitions from dc voltage, to output it to described protection controller.
25, backlight drive device according to claim 24; wherein; the described main dc voltage that described protection controller will feed back and describedly be converted to the first digital feedback voltage and the second digital feedback voltage from dc voltage; and the size of benchmark initial voltage and the described first digital feedback voltage and the described second digital feedback voltage compared, whether wrong to determine under the initial driving situation.
26, backlight drive device according to claim 25; wherein; when the size of described benchmark initial voltage is identical with the second digital feedback voltage with the described first digital feedback voltage; described protection controller just determines that the initialization situation is normal, and exports described enable signal to described lamp driving governor.
27, backlight drive device according to claim 25, wherein, when described size differed from one another, described protection controller was just determined to have produced mistake under the initial driving situation, and to described lamp driving governor output initial error signal.
28, backlight drive device according to claim 23, wherein, described protection controller and described lamp driving governor are implemented as a chip.
29, a kind of driving method backlight of liquid crystal indicator, this is backlight to comprise and being used for to the main-transformer of a plurality of lamp supply of current with from transformer and be used to drive the master driver of described lamp and from driver, this method comprises the steps:
To be main dc voltage from the main AC voltage transitions of described main-transformer feedback, and will from described be from dc voltage from transformer feedback from the AC voltage transitions;
Under the initial driving situation, use the described main dc voltage of feedback and describedly judge the generation of the initial error of described lamp, and generate initial error signal and enable signal according to this result from dc voltage; And
In response to from the described initial error signal of described protection controller and stop described master driver and described driving, perhaps in response to from the described enable signal of described protection controller and the described master driver of driven and described from driver from driver.
30, backlight driving method according to claim 29, wherein, the described step that voltage is changed comprises the steps:
Make from the described main AC voltage decline of described main-transformer output and to it and feed back;
Make from described and feed back from the decline of AC voltage and to it from the described of transformer output;
To be described main dc voltage via the main AC voltage transitions of the described second main voltage divider feedback; And
To be described from voltage divider feedback from the AC voltage transitions via described second from dc voltage.
31, backlight driving method according to claim 30, wherein, in the described step that generates described initial error signal or described enable signal, the described main dc voltage that described backlight drive device will feed back and describedly be converted to the first digital feedback voltage and the second digital feedback voltage from dc voltage, and the size of benchmark initial voltage and the described first digital feedback voltage and the described second digital feedback voltage compared, whether wrong to determine under the initial driving situation.
32, backlight driving method according to claim 31, wherein, when the size of described benchmark initial voltage is identical with the described second digital feedback voltage with the described first digital feedback voltage, described backlight drive device just determines that the initial driving situation is normal, and generates described enable signal to described lamp driving governor.
33, backlight driving method according to claim 31, wherein, when described size differed from one another, described backlight drive device generated described initial error signal with regard to determining to produce wrong under the initial driving situation.
34, a kind of backlight drive device of liquid crystal indicator, this backlight drive device comprise and being used for to the main-transformer of a plurality of lamp supply of current with from transformer and be used to drive the master driver of described lamp and from driver, this backlight drive device comprises:
Working condition pick-up unit, this working condition pick-up unit be used for because of from described main-transformer and described from transformer feedback main AC voltage and be analog D C voltage from the AC voltage transitions that the phase differential of AC voltage generates;
The protection controller, the mistake of the lamp that this protection controller is used to use described analog D C voltage to judge described work produces, and stop described master driver and described driving, the perhaps described master driver of driven and described from driver from driver according to this result; And
The lamp driving governor, this lamp driving governor is controlled described master driver and described output from driver according to the pulse light modulation signal of being imported.
35, backlight drive device according to claim 34, wherein, described working condition unit comprises:
The first main voltage divider is used to make from the described main AC voltage decline of described main-transformer output and to it and feeds back;
First from voltage divider, is used to make from described feed back from the decline of AC voltage and to it from the described of transformer output; And
The working condition detecting device, the AC voltage transitions that is used for generating because of the main AC voltage of described feedback and described phase differential between AC voltage is described analog D C voltage, to output it to described protection controller.
36, backlight drive device according to claim 35, wherein, described protection controller comprises comparer, this comparer is used under working condition and will compares from the size and the benchmark job voltage of the analog D C voltage of described working condition detecting device.
37, backlight drive device according to claim 36, wherein, when the size of described benchmark job voltage was identical with described analog D C voltage, described comparer was just to described master driver and described from driver output enable signal.
38, backlight drive device according to claim 36, wherein, when described size differed from one another, described comparer was just to described master driver and described from driver output disable signal.
39, backlight drive device according to claim 34, this backlight drive device also comprises:
The Voltage Feedback device, being used for to be main dc voltage from the main AC voltage transitions of described main-transformer feedback, and be used for from described from transformer feedback from the AC voltage transitions for from dc voltage, they being exported to described protection controller, and
Wherein, described protection controller uses described main AC voltage and describedly determines that from dc voltage the mistake of initial driving situation produces, and
Described lamp driving governor is controlled described master driver and described initial driving from driver according to the judgement of described protection controller.
40, according to the described backlight drive device of claim 39, wherein, described Voltage Feedback device comprises:
The second main voltage divider is used to make from the described main AC voltage decline of described main-transformer output and to it and feeds back;
Second from voltage divider, is used to make from described feed back from the decline of AC voltage and to it from the described of transformer output;
Main AC/DC converter, being used for the main AC voltage transitions via the described second main voltage divider feedback is described main dc voltage, to output it to described protection controller; And
Main AC/DC converter, being used for the main AC voltage transitions via the described second main voltage divider feedback is described main dc voltage, to output it to described protection controller.
41, according to the described backlight drive device of claim 40; wherein; the described main dc voltage that described protection controller will feed back and describedly be converted to the first digital feedback voltage and the second digital feedback voltage from dc voltage; and the size of benchmark initial voltage and the described first digital feedback voltage and the described second digital feedback voltage compared, whether wrong to determine under the initial driving situation.
42, according to the described backlight drive device of claim 41; wherein; when the size of described benchmark initial voltage is identical with the second digital feedback voltage with the described first digital feedback voltage; described protection controller just determines that the initial driving situation is normal, and exports initial normal signal to described lamp driving governor.
43, according to the described backlight drive device of claim 42, wherein, described lamp driving governor is the described master driver of initial driving and described from driver in response to described initial normal signal.
44, according to the described backlight drive device of claim 41, wherein, when described size differed from one another, described protection controller was just determined to have produced mistake under the initial driving situation, and to described lamp driving governor output initial error signal.
45, according to the described backlight drive device of claim 44, wherein, described lamp driving governor stops described master driver and described initial driving from driver in response to described initial error signal under the initial driving situation.
46, a kind of driving method backlight of liquid crystal indicator, this is backlight to comprise and being used for to the main-transformer of a plurality of lamp supply of current with from transformer and be used to drive the master driver of described lamp and from driver, this method comprises the steps:
Will because of from described main-transformer and described from transformer feedback main AC voltage and be analog D C voltage from the AC voltage transitions that the phase differential of AC voltage generates; And
Use described analog D C voltage to judge that the mistake of described lamp of working produces, with according to this result to described main-transformer and described, perhaps to described main-transformer and described from transformer supply enable signal from transformer supply disable signal.
47, according to the described backlight driving method of claim 46, wherein, the described step that voltage is changed comprises the steps:
Make from the described main AC voltage decline of described main-transformer output and to it and feed back;
Make from described and feed back from the decline of AC voltage and to it from the described of transformer output; And
The AC voltage transitions that will generate because of the main AC voltage of described feedback and described phase differential between AC voltage is described analog D C voltage.
48, according to the described backlight driving method of claim 46, wherein, the step of described generation signal is a digital feedback voltage with described simulation AC voltage transitions under the working condition of described lamp, and the size and the described digital feedback voltage of benchmark job voltage compared, whether wrong to determine under working condition in the step of described suppling signal.
49, according to the described backlight driving method of claim 48, wherein, when the size of described benchmark job voltage was identical with described digital feedback voltage, described backlight drive device was just to described master driver with describedly supply described enable signal from driver.
50, according to the described backlight driving method of claim 48, wherein, when described size differed from one another, described backlight drive device was to described master driver and describedly supply described disable signal from driver.
51, according to the described backlight driving method of claim 46, this backlight driving method also comprises the steps:
To be main dc voltage from the main AC voltage transitions of described main-transformer feedback, and will from described be from dc voltage from transformer feedback from the AC voltage transitions;
Under the initial driving situation, use the described main dc voltage of feedback and describedly judge that from dc voltage the initial error of described lamp produces, to generate initial error signal or enable signal according to this result; And
Stop described master driver and described initial driving in response to described initial error signal from driver.
52, according to the described backlight driving method of claim 51, wherein, the described step that voltage is changed comprises the steps:
Make from the described main AC voltage decline of described main-transformer output and to it and feed back;
Make from described and feed back from the decline of AC voltage and to it from the described of transformer output;
To be described main dc voltage via the main AC voltage transitions of the described second main voltage divider feedback; And
To be described from voltage divider feedback from the AC voltage transitions via described second from dc voltage.
53, according to the described backlight driving method of claim 52, wherein, in the described step that generates described initial error signal or described initial normal signal, the described main dc voltage that described backlight drive device will feed back and describedly be converted to the first digital feedback voltage and the second digital feedback voltage from dc voltage, and the size of benchmark initial voltage and the described first digital feedback voltage and the described second digital feedback voltage compared, whether wrong to determine under the initial driving situation.
54, according to the described backlight driving method of claim 53, wherein, when the size of described benchmark initial voltage was identical with the described second digital feedback voltage with the described first digital feedback voltage, described backlight drive device generated described initial normal signal with regard to determining that the initial driving situation is normal.
55, according to the described backlight driving method of claim 53, wherein, when described size differed from one another, described backlight drive device generated described initial error signal with regard to determining to have produced wrong under the initial driving situation.
56, a kind of backlight drive device of liquid crystal indicator, this backlight drive device comprise and being used for to the main-transformer of a plurality of lamp supply of current with from transformer and be used to drive the master driver of described lamp and from driver, this backlight drive device comprises:
Working condition pick-up unit, this working condition pick-up unit be used for because of from described main-transformer and described from transformer feedback main AC voltage and be analog D C voltage from the AC voltage transitions that the phase differential of AC voltage generates; And
Main control unit, this main control unit is used for controlling described master driver and described output from driver in response to the pulse light modulation signal of being imported, and the mistake that is used to use described analog D C voltage to judge described lamp of working produces, to stop described master driver and described driving or the described master driver of driven and described from driver from driver according to this result.
57, according to the described backlight drive device of claim 56, wherein, described working condition unit comprises:
The first main voltage divider is used to make from the described main AC voltage decline of described main-transformer output and to it and feeds back;
First from voltage divider, is used to make from described feed back from the decline of AC voltage and to it from the described of transformer output; And
The working condition detecting device, the AC voltage transitions that is used for generating because of the main AC voltage of described feedback and described phase differential between AC voltage is described analog D C voltage, to output it to described protection controller.
58, according to the described backlight drive device of claim 57, wherein, described main control unit comprises comparer, and this comparer is used under working condition and will compares from the size and the benchmark job voltage of the analog D C voltage of described working condition detecting device.
59, according to the described backlight drive device of claim 58, wherein, when the size of described benchmark job voltage was identical with described analog D C voltage, described comparer was just to described master driver and described from driver output enable signal.
60, according to the described backlight drive device of claim 58, wherein, when described size differed from one another, described comparer was just to described master driver and described from driver output disable signal.
61, according to the described backlight drive device of claim 56, this backlight drive device also comprises:
The Voltage Feedback device, being used for to be main dc voltage from the main AC voltage transitions of described main-transformer feedback, and be used for from described from transformer feedback from the AC voltage transitions for from dc voltage, they being exported to described main control unit, and
Wherein, described main control unit uses described main AC voltage and describedly determines that from dc voltage the mistake of initial driving situation produces, and controls described master driver and described initial driving from driver according to this result.
62, according to the described backlight drive device of claim 61, wherein, described Voltage Feedback device comprises:
The second main voltage divider is used to make from the described main AC voltage decline of described main-transformer output and to it and feeds back;
Second from voltage divider, is used to make from described feed back from the decline of AC voltage and to it from the described of transformer output;
Main AC/DC converter, being used for the main AC voltage transitions via the described second main voltage divider feedback is described main dc voltage, to output it to described main control unit; And
Main AC/DC converter, being used for the main AC voltage transitions via the described second main voltage divider feedback is described main dc voltage, to output it to described main control unit.
63, according to the described backlight drive device of claim 61, wherein, the described main dc voltage that described main control unit will feed back and describedly be converted to the first digital feedback voltage and the second digital feedback voltage from dc voltage, and the size of benchmark initial voltage and the described first digital feedback voltage and the second digital feedback voltage compared, whether wrong to determine under the initial driving situation.
64, according to the described backlight drive device of claim 63, wherein, when the size of described benchmark initial voltage is identical with the second digital feedback voltage with the described first digital feedback voltage, described main control unit just determines that the initial driving situation is normal, and the described master driver of initial driving and described from driver.
65, according to the described backlight drive device of claim 63, wherein, when described size differed from one another, described main control unit was just determined to produce mistake under the initial driving situation, and stops described master driver and described initial driving from driver.
66, a kind of backlight drive device of liquid crystal indicator, this backlight drive device comprise and being used for to the main-transformer of a plurality of lamp supply of current with from transformer and be used to drive the master driver of described lamp and from driver, this backlight drive device comprises:
Feedback section is used for from the main AC voltage of described main-transformer output with from described feeding back from AC voltage from transformer output; And
Protection controller, this protection controller use by the main AC voltage of described feedback section feedback with from AC voltage and wrongheaded generation, with producing when wrong, stop described master driver and described driving from driver.
67, according to the described backlight drive device of claim 66; wherein; described feedback section will be from the main dc voltage of main AC voltage transitions for feeding back of described main-transformer feedback under initial situation; and will from described from transformer feedback from the AC voltage transitions for feedback from dc voltage, and in turn main dc voltage of described feedback and described feedback are exported to described protection controller from AC voltage.
68, according to the described backlight drive device of claim 67; wherein; described protection controller is converted to digital feedback voltage with the main dc voltage of described feedback and described feedback from dc voltage under initial situation; and the size and the digital feedback voltage of benchmark initial voltage compared, whether wrong to determine under the initial driving situation.
69, according to the described backlight drive device of claim 68, wherein, when the size of described benchmark initial voltage was identical with digital feedback voltage, described protection controller was just to described master driver and described from driver output enable signal.
70, according to the described backlight drive device of claim 68, wherein, when described size differed from one another, described protection controller was just to described master driver and described from driver output disable signal.
71, according to the described backlight drive device of claim 67; wherein; described feedback section is under working condition; will because of from described main-transformer and described be analog D C voltage from the main AC voltage of transformer feedback and from the simulation AC voltage transitions that the phase differential between the AC voltage generates, to output it to described protection controller.
72, according to the described backlight drive device of claim 71; wherein; described protection controller will be digital AC voltage by the analog D C voltage transitions of described feedback section feedback under working condition; and the size and the digital AC voltage of benchmark job voltage compared, whether wrong to determine under working condition.
73, according to the described backlight drive device of claim 72, wherein, when the size of described benchmark job voltage was identical with digital AC voltage, described protection controller was just to described master driver and described from driver output enable signal.
74, according to the described backlight drive device of claim 72, wherein, when described size differed from one another, described protection controller was just to described master driver and described from driver output disable signal.
75, according to the described backlight drive device of claim 67, wherein, whether described protection controller will be compared by the size and the benchmark job voltage of the analog D C voltage of described feedback section feedback under working condition, wrong to determine under working condition.
76, according to the described backlight drive device of claim 75, wherein, when the described analog D C voltage of the size of described benchmark job voltage and feedback was identical, described protection controller was just to described master driver and described from driver output enable signal.
77, according to the described backlight drive device of claim 75, wherein, when described size differed from one another, described protection controller was just to described master driver and described from driver output disable signal.
78, according to the described backlight drive device of claim 66; wherein; described feedback section is under working condition; will be from the main dc voltage of main AC voltage transitions for feeding back of described main-transformer feedback; and will from described from transformer feedback from the AC voltage transitions for feedback from dc voltage, and in turn the main dc voltage of described feedback and described feedback exported to described protection controller from AC voltage.
79, according to the described backlight drive device of claim 78; wherein; described protection controller is under working condition; main dc voltage of described feedback and described feedback are converted to digital feedback voltage from dc voltage; and the size and the digital feedback voltage of benchmark job voltage compared, whether wrong to determine under working condition.
80, according to the described backlight drive device of claim 79, wherein, when the size of described benchmark job voltage was identical with digital feedback voltage, described protection controller was just to described master driver and described from driver output enable signal.
81, according to the described backlight drive device of claim 79, wherein, when described size differed from one another, described protection controller was just to described master driver and described from driver output disable signal.
82, according to the described backlight drive device of claim 78; wherein; described feedback section is under initial situation; will because of from described main-transformer and described be analog D C voltage from the main AC voltage of transformer feedback with from the simulation AC voltage transitions that the phase differential between the AC voltage generates, and output it to described protection controller.
83,2 described backlight drive devices according to Claim 8; wherein; described protection controller is under initial situation; to be digital AC voltage via the analog D C voltage transitions of described feedback section feedback; and the size and the digital AC voltage of benchmark initial voltage compared, whether wrong to determine under initial situation.
84,3 described backlight drive devices according to Claim 8, wherein, when the size of described benchmark initial voltage was identical with digital AC voltage, described protection controller was just to described master driver and described from driver output enable signal.
85,3 described backlight drive devices according to Claim 8, wherein, when described size differed from one another, described protection controller was just to described master driver and described from driver output disable signal.
86, according to the described backlight drive device of claim 78, wherein, whether described protection controller will compare via the size and the benchmark initial voltage of the analog D C voltage of described feedback section feedback under initial situation, wrong to determine under initial situation.
87,6 described backlight drive devices according to Claim 8, wherein, when the described analog D C voltage of the size of described benchmark initial voltage and feedback was identical, described protection controller was just to described master driver and described from driver output enable signal.
88,6 described backlight drive devices according to Claim 8, wherein, when described size differed from one another, described protection controller was just to described master driver and described from driver output disable signal.
89, according to the described backlight drive device of claim 66; wherein; described feedback section is under initial situation or working condition; will be from the main dc voltage of main AC voltage transitions for feeding back of described main-transformer feedback; and will from described from transformer feedback from the AC voltage transitions for feedback from dc voltage, in turn the main dc voltage of described feedback and described feedback exported to described protection controller from dc voltage.
90,9 described backlight drive devices according to Claim 8; wherein; described protection controller is under initial situation or working condition; main dc voltage of described feedback and described feedback are converted to digital feedback voltage from dc voltage; and the size and the digital feedback voltage of reference voltage compared, whether wrong to determine under initial situation or working condition.
91, according to the described backlight drive device of claim 90, wherein, when the size of described reference voltage was identical with digital feedback voltage, described protection controller was just to described master driver and described from driver output enable signal.
92, according to the described backlight drive device of claim 90, wherein, when described size differed from one another, described protection controller was just to described master driver and described from driver output disable signal.
93, according to the described backlight drive device of claim 66; wherein; described feedback section is under initial situation or working condition; will because of from described main-transformer and described be analog D C voltage from the main AC voltage of transformer feedback with from the simulation AC voltage transitions that the phase differential between the AC voltage generates, and output it to the protection controller.
94, according to the described backlight drive device of claim 93; wherein; described protection controller is under initial situation or working condition; to be digital AC voltage via the analog D C voltage transitions of described feedback section feedback; and the size and the digital AC voltage of reference voltage compared, whether wrong to determine under initial situation or working condition.
95, according to the described backlight drive device of claim 94, wherein, when the size of described reference voltage was identical with digital AC voltage, described protection controller was just to described master driver and described from driver output enable signal.
96, according to the described backlight drive device of claim 94, wherein, when described size differed from one another, described protection controller was just to described master driver and described from driver output disable signal.
97, according to the described backlight drive device of claim 66, wherein, described feedback section under initial situation or working condition, will because of from described main-transformer and described be analog D C voltage from the main AC voltage of transformer feedback with from the simulation AC voltage transitions that the phase differential between the AC voltage generates.
98, according to the described backlight drive device of claim 97; wherein; whether described protection controller will compare via the size and the reference voltage of the analog D C voltage of described feedback section feedback under initial situation or working condition, wrong to determine under initial situation or working condition.
99, according to the described backlight drive device of claim 98, wherein, when the size of described reference voltage was identical with described simulation AC voltage, described protection controller was just to described master driver and described from driver output enable signal.
100, according to the described backlight drive device of claim 98, wherein, when described size differed from one another, described protection controller was just to described master driver and described from driver output disable signal.
CN200610169498XA 2006-04-13 2006-12-15 Apparatus and method for driving backlight of liquid crystal display apparatus Expired - Fee Related CN101055703B (en)

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