CN102446491A - Integrated backlight driving chip and light emitting diode backlight device - Google Patents
Integrated backlight driving chip and light emitting diode backlight device Download PDFInfo
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- CN102446491A CN102446491A CN2010105044188A CN201010504418A CN102446491A CN 102446491 A CN102446491 A CN 102446491A CN 2010105044188 A CN2010105044188 A CN 2010105044188A CN 201010504418 A CN201010504418 A CN 201010504418A CN 102446491 A CN102446491 A CN 102446491A
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- backlight
- led
- emitting diode
- light
- digital control
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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
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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
- G09G3/36—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 using liquid crystals
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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention discloses an integrated backlight driving chip which is used for driving a light-emitting diode backlight module. The integrated backlight driving chip comprises a scaling control circuit and a backlight driving circuit. The scaling control circuit comprises a digital control unit and a variable reference voltage generating unit. The digital control unit is used for generating a digital control signal. The variable reference voltage generating unit is used for generating a reference voltage. The backlight driving circuit is coupled to the digital control unit, the variable reference voltage generating unit and the light emitting diode backlight module, and is used for generating a backlight driving signal according to the digital control signal and the reference voltage so as to drive the light emitting diode backlight module.
Description
Technical field
The present invention relates to a kind of integration backlight driving chip and LED backlight device, refer to a kind of integration backlight driving chip and LED backlight device of integrating the digital control ability of image-zooming chip especially.
Background technology
LCD (Liquid Crystal Display; LCD) have characteristics such as frivolous, radiationless pollution of external form and low consumpting power; Therefore, be widely used on the electronic products such as flat-surface television, computer system, mobile phone, personal digital assistant.The principle of work system of LCD controls the transmittance of liquid crystal layer by the ordered state that changes liquid crystal molecule, and to produce the output light of varying strength, the backlight module of arranging in pairs or groups again reaches the effect of show image.Typical liquid crystal includes liquid crystal panel, control chip group, chip for driving group and backlight module.Control chip is responsible for the conversion and the processing of signal of video signal.Chip for driving is responsible for exporting corresponding voltage signal, controls the transmittance of each picture element of liquid crystal panel, with the show image signal.Wherein, control chip group comprises an image-zooming chip, is used for that signal of video signal is carried out image-zooming and handles, and meets the signal of video signal of outputting standard (the for example resolution or the aspect ratio of level and vertical picture) with generation.
In addition, because liquid crystal molecule itself can be not luminous,, make liquid crystal panel reach the effect of demonstration so LCD must provide liquid crystal panel required light source by backlight module.The backlight module of tradition liquid crystal panel is that (Cold Cathode Fluorescent Lamp is CCFL) as light source with cathode fluorescent tube.Compared to the employed light source of tradition; Light emitting diode (Light Emitting Diode, LED) have power saving, assembly life-span length, no mercury, colour gamut abundant, need not warm up multiple advantages such as lamp time and reaction velocity be fast, and luminescence efficiency constantly promotes; Cost reduces day by day; Therefore, in recent years, light emitting diode has and replaces the trend that cathode fluorescent tube is used as the backlight module light source gradually.
Please refer to Fig. 1, Fig. 1 is the synoptic diagram of a known LED backlight device 10.LED backlight device 10 includes a light-emitting diode (LED) backlight module 102, a backlight driving chip 104 and a backlight drive circuit plate 106.As shown in Figure 1, light-emitting diode (LED) backlight module 102 includes the light emitting diode serial C1～Cm of parallel connection, and each light emitting diode serial system is made up of the light emitting diode of a plurality of serial connections.Backlight driving chip 104 is to be arranged on the backlight drive circuit plate 106, is used for driven for emitting lights diode backlight module 102 and control the brightness of each light emitting diode, reaches the effect of show image so that liquid crystal panel to be provided.In general; For in response to different application requirements, backlight driving chip 104 must be controlled the size of current or the switching frequency of each light emitting diode serial of flowing through through a non-essential resistance R, yet; Non-essential resistance R can't provide broad change in resistance usually, satisfies trickleer adjustment.Moreover, for different application settings, need different resistance to arrange in pairs or groups usually, in other words, the variation of the various non-essential resistances of backlight driving chip 104 necessary collocation, the beginning can be dealt with various application demands, thus, will cause the too high problem of cost.And; Light-emitting diode (LED) backlight module 102 (the for example difference of the quantity of light emitting diode or assembled arrangement mode) to different set also must provide corresponding backlight driving chip 104, that is to say; Because inborn restriction; Known backlight driving chip can't satisfy the variation control of electric current miscellaneous or switching frequency, and flexible use can't be provided, and on integral body is used, exists great inconvenience.
On the other hand; Fault handling (FAULT) mechanism about LED backlight device 10; Usually lie in light-emitting diode (LED) backlight module 102 when the situation of superpotential or short circuit takes place, operating power is turned off and light-emitting diode (LED) backlight module 102 and backlight driving chip 104 are decommissioned to reach protective effect.Then, restart operating power again, proceed the backlight drive operation.Yet along with restarting of total system running, original error situation does not but go on record, thereby causes the degree of difficulty of debug in the future.
Summary of the invention
Therefore, fundamental purpose of the present invention promptly is to provide a kind of integration backlight driving chip and LED backlight device.
The present invention discloses a kind of integration backlight driving chip, is used for driving a light-emitting diode (LED) backlight module, includes: a convergent-divergent control circuit includes: a digital control unit is used for producing a digital controlled signal; And a variable reference voltage generation unit, be used for producing a reference voltage; An and backlight drive circuit; Be coupled to this digital control unit, this variable reference voltage generation unit and this light-emitting diode (LED) backlight module; Be used for producing a backlight drive signal, to drive this light-emitting diode (LED) backlight module according to this digital controlled signal and this reference voltage.
The present invention also discloses a kind of LED backlight device, includes: a light-emitting diode (LED) backlight module; And one integrate backlight driving chip, includes; One convergent-divergent control circuit includes: a digital control unit is used for producing a digital controlled signal; And a variable reference voltage generation unit, be used for producing a reference voltage; An and backlight drive circuit; Be coupled to this digital control unit, this variable reference voltage generation unit and this light-emitting diode (LED) backlight module; Be used for producing a backlight drive signal, to drive this light-emitting diode (LED) backlight module according to this digital controlled signal and this reference voltage.
Description of drawings
Fig. 1 is the synoptic diagram of a known LED backlight device.
Fig. 2 is the synoptic diagram of embodiment of the invention LED backlight device.
Wherein, description of reference numerals is following:
10,20 LED backlight devices
102,202 light-emitting diode (LED) backlight modules
104 backlight driving chip
106 backlight drive circuit plates
204 integrate backlight driving chip
206 convergent-divergent control circuits
208 backlight drive circuits
210 digital control units
212 variable reference voltage generation units
214 digital control buffers
216 detecting fault unit
C1～Cm light emitting diode serial
D backlight drive setting value
The ER error result
The R non-essential resistance
The SC digital controlled signal
SD backlight drive signal
SR error detection signal
The VR reference voltage
Embodiment
Please refer to Fig. 2, Fig. 2 is the synoptic diagram of embodiment of the invention LED backlight device 20.LED backlight device 20 includes a light-emitting diode (LED) backlight module 202 and and integrates backlight driving chip 204.In the present embodiment, light-emitting diode (LED) backlight module 202 includes the light emitting diode serial C1～Cm of parallel connection, and each light emitting diode serial system is made up of the light emitting diode of a plurality of serial connections, but not as limit.In other words, light-emitting diode (LED) backlight module 202 also can only have a light emitting diode serial, and each light emitting diode serial also can only comprise single light emitting diode.Integrate backlight driving chip 204 and be used for driven for emitting lights diode backlight module 202, reach the effect of show image so that a liquid crystal panel to be provided.
Integrate backlight driving chip 204 and include a convergent-divergent control circuit 206 and a backlight drive circuit 208.Convergent-divergent control circuit 206 includes a digital control unit 210, a variable reference voltage generation unit 212 and one digital control buffer 214.Digital control buffer 214 is used for storing a backlight drive setting value D, and digital control unit 210 is coupled to digital control buffer 214, is used for according to backlight drive setting value D, produces a digital controlled signal SC, to provide to backlight drive circuit 208.For example, digital controlled signal SC can be sent to backlight drive circuit 208 via a control bus.Variable reference voltage generation unit 212 is coupled to backlight drive circuit 208, is used for producing a reference voltage VR.Backlight drive circuit 208 is coupled to digital control unit 210, variable reference voltage generation unit 212 and light-emitting diode (LED) backlight module 202; Be used for according to digital controlled signal SC and reference voltage VR; Produce a backlight drive signal SD, with driven for emitting lights diode backlight module 202.In other words, the present invention does not need extra non-essential resistance, but passes through the digital control ability of convergent-divergent control circuit 206, adjusts the required backlight drive signal SD of backlight drive circuit 208 outputs, to provide more flexibly and accurate backlight drive selection.
Further specify, to different application, the for example variation set of backlight drive or drive different types of light-emitting diode (LED) backlight module.The present invention can set various required backlight drive setting value D by software mode in digital control buffer 214, so that digital control unit 210 produces digital controlled signal SC according to this.Backlight drive circuit 208 produces required backlight drive signal SD, with driven for emitting lights diode backlight module 202 again according to digital controlled signal SC and reference voltage VR.Therefore, the setting value parameter that when the variation demand used, only need change digital control buffer 214 can provide required backlight drive signal SD.
Therefore; The present invention is through convergent-divergent control circuit 206 in the integration script control chip and the backlight drive circuit 208 in the back lighting device; Make the whole number control ability that backlight drive circuit 208 convergent-divergent control circuits 206 capable of using are had; Provide light-emitting diode (LED) backlight module 202 more polynary driving selection to reach more accurate signal quality, thus, can significantly promote the application of elastic of backlight drive.
Because in general LCD, originally promptly having the convergent-divergent control circuit in the control chip of liquid crystal panel provides the picture element Signal Processing.The convergent-divergent control circuit is made into a convergent-divergent control chip usually, and places and provide image-zooming to handle on the individual printed circuit boards.Moreover in the general LED backlight device, backlight drive circuit also is to be made into a backlight driving chip usually, and places backlight drive is provided on the individual printed circuit boards.In the present invention, convergent-divergent control circuit 206 and backlight drive circuit 208 are integrated in the same chip.In the case, convergent-divergent control circuit 206 still can provide the function of the signal of video signal conversion of liquid crystal panel, and utilizes the whole number control ability of convergent-divergent control circuit 206, realizes more polynary and accurate backlight drive purpose.In addition, convergent-divergent control circuit 206 is connected with circuit between the backlight drive circuit 208 only to be needed can accomplish in the chip internal backguy, and need not use complicated printed circuit board wiring.Therefore, compared to known technology, the present invention does not need on printed circuit board (PCB), to use extra passive component, and only need use single printed circuit board (PCB) to realize, thus, can effectively reduce manufacturing cost.
On the other hand; Integrate backlight driving chip 204 and also comprise a detecting fault unit 216; It is coupled to light-emitting diode (LED) backlight module 202, backlight drive circuit 208 and digital control buffer 214, is used for detecting the running error situation of light-emitting diode (LED) backlight module 202.When detecting light-emitting diode (LED) backlight module 202 generation running error situations (for example superpotential or short circuit), detecting fault unit 216 can produce an error result ER and error detection signal SR.Error result ER is stored to digital control buffer 214, for the debug reference.Error detection signal SR can be transferred into backlight drive circuit 208, handles to provide backlight drive circuit 208 to carry out relevant abnormalities.In the case; Because error result ER is stored in the digital control buffer 214; Therefore, as long as can find out the operating mistake that on light-emitting diode (LED) backlight module 202, is taken place easily, further to get rid of unusual condition according to this through the digital control buffer 214 of access.In other words; Buffer function in the present invention's convergent-divergent control circuit 206 capable of using; The unusual condition that light-emitting diode (LED) backlight module 202 is taken place is noted down; So that the processing reference of follow-up debug to be provided, and be unlikely to after unusual condition takes place, only can carry out system passively and restart action and do not have further debug program.
In sum, the present invention does not need extra non-essential resistance, but passes through the digital control ability of convergent-divergent control circuit 206; Adjust the required backlight drive signal of backlight drive circuit 208 outputs; Select with accurate backlight drive to provide more flexibly, in other words, through the operation of programmable; Can significantly promote the application of elastic of backlight drive, to realize more polynary and accurate backlight drive purpose.In addition, the present invention more only need use single printed circuit board (PCB) can realize image-zooming function and backlight drive function, and can effectively reduce manufacturing cost using the extra passive component on the printed circuit board (PCB) except not needing.On the other hand, the buffer function in the further convergent-divergent control circuit 206 capable of using of the present invention is noted down the unusual condition that light-emitting diode (LED) backlight module 202 is taken place get off, and the processing reference of follow-up debug is provided, to reduce the degree of difficulty of debug program.
The above is merely the preferred embodiments of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (13)
1. integrate backlight driving chip for one kind, be used for driving a light-emitting diode (LED) backlight module, it is characterized in that,
Include:
One convergent-divergent control circuit includes:
One digital control unit is used for producing a digital controlled signal; And
One variable reference voltage generation unit is used for producing a reference voltage; And
One backlight drive circuit; Be coupled to this digital control unit, this variable reference voltage generation unit and this light-emitting diode (LED) backlight module; Be used for producing a backlight drive signal, to drive this light-emitting diode (LED) backlight module according to this digital controlled signal and this reference voltage.
2. integration backlight driving chip as claimed in claim 1; It is characterized in that this convergent-divergent control circuit also includes a digital control buffer, is coupled to this digital control unit; Be used for storing a backlight drive setting value, so that this digital control unit produces this digital controlled signal according to this.
3. integration backlight driving chip as claimed in claim 2; It is characterized in that; This integration backlight driving chip also includes a detecting fault unit; Be coupled to this light-emitting diode (LED) backlight module, this backlight drive circuit and this digital control buffer, be used for detecting the running error situation of this light-emitting diode (LED) backlight module.
4. integration backlight driving chip as claimed in claim 3; It is characterized in that; When detecting this light-emitting diode (LED) backlight module generation running error situation, this detecting fault unit produces an error result, and this error result is stored to this digital control buffer.
5. integration backlight driving chip as claimed in claim 3 is characterized in that, when detecting this light-emitting diode (LED) backlight module generation running error situation in this detecting fault unit, this detecting fault unit produces an error detection signal to this backlight drive circuit.
6. integration backlight driving chip as claimed in claim 1 is characterized in that, this digital controlled signal system is sent to this backlight drive circuit via a control bus.
7. LED backlight device includes:
One light-emitting diode (LED) backlight module; And
One integrates backlight driving chip, includes;
One convergent-divergent control circuit includes:
One digital control unit is used for producing a digital controlled signal; And
One variable reference voltage generation unit is used for producing a reference voltage; And
One backlight drive circuit; Be coupled to this digital control unit, this variable reference voltage generation unit and this light-emitting diode (LED) backlight module; Be used for producing a backlight drive signal, to drive this light-emitting diode (LED) backlight module according to this digital controlled signal and this reference voltage.
8. LED backlight device as claimed in claim 7 is characterized in that, this light-emitting diode (LED) backlight module includes a plurality of light emitting diode serials arranged side by side.
9. LED backlight device as claimed in claim 7; It is characterized in that this convergent-divergent control circuit also includes a digital control buffer, is coupled to this digital control unit; Be used for storing a backlight drive setting value, so that this digital control unit produces this digital controlled signal according to this.
10. LED backlight device as claimed in claim 9; It is characterized in that; This integration backlight driving chip also includes a detecting fault unit; Be coupled to this light-emitting diode (LED) backlight module, this backlight drive circuit and this digital control buffer, be used for detecting the running error situation of this light-emitting diode (LED) backlight module.
11. LED backlight device as claimed in claim 10; It is characterized in that; When detecting this light-emitting diode (LED) backlight module generation running error situation, this detecting fault unit produces an error result, and this error result is stored to this digital control buffer.
12. LED backlight device as claimed in claim 10; It is characterized in that; When detecting this light-emitting diode (LED) backlight module generation running error situation in this detecting fault unit, this detecting fault unit produces an error detection signal to this backlight drive circuit.
13. LED backlight device as claimed in claim 7 is characterized in that, this digital controlled signal system is sent to this backlight drive circuit via a control bus.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610073721.4A CN105590589A (en) | 2010-10-08 | 2010-10-08 | Integrated backlight driving chip and light emitting diode backlight device |
| CN2010105044188A CN102446491A (en) | 2010-10-08 | 2010-10-08 | Integrated backlight driving chip and light emitting diode backlight device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105044188A CN102446491A (en) | 2010-10-08 | 2010-10-08 | Integrated backlight driving chip and light emitting diode backlight device |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610073721.4A Division CN105590589A (en) | 2010-10-08 | 2010-10-08 | Integrated backlight driving chip and light emitting diode backlight device |
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| CN102446491A true CN102446491A (en) | 2012-05-09 |
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| CN2010105044188A Pending CN102446491A (en) | 2010-10-08 | 2010-10-08 | Integrated backlight driving chip and light emitting diode backlight device |
| CN201610073721.4A Pending CN105590589A (en) | 2010-10-08 | 2010-10-08 | Integrated backlight driving chip and light emitting diode backlight device |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610073721.4A Pending CN105590589A (en) | 2010-10-08 | 2010-10-08 | Integrated backlight driving chip and light emitting diode backlight device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102930807A (en) * | 2012-08-31 | 2013-02-13 | 浙江工业大学 | Two-bus parallel LED colored bulb lamp display screen control system |
| CN109741710A (en) * | 2019-02-20 | 2019-05-10 | 昆山弘锦威电子有限公司 | Integrate backlight driving chip and LED backlight device |
| CN112437515A (en) * | 2020-05-07 | 2021-03-02 | 光宝电子(广州)有限公司 | Backlight module and operation method thereof |
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| CN201114910Y (en) * | 2007-10-18 | 2008-09-10 | 康佳集团股份有限公司 | A LED driving circuit |
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| CN100529855C (en) * | 2006-09-29 | 2009-08-19 | 群康科技(深圳)有限公司 | LCD device |
| CN101388195A (en) * | 2008-08-26 | 2009-03-18 | 矽创电子股份有限公司 | Control chip of color sequential liquid crystal display device |
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2010
- 2010-10-08 CN CN2010105044188A patent/CN102446491A/en active Pending
- 2010-10-08 CN CN201610073721.4A patent/CN105590589A/en active Pending
Patent Citations (4)
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| CN101207953A (en) * | 2006-12-21 | 2008-06-25 | 钰瀚科技股份有限公司 | Light-emitting diode driver and drive system |
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| US20090225021A1 (en) * | 2008-03-05 | 2009-09-10 | Ye Byoung-Dae | Method of driving a light source, light source device for performing the same, and display device having the light source device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102930807A (en) * | 2012-08-31 | 2013-02-13 | 浙江工业大学 | Two-bus parallel LED colored bulb lamp display screen control system |
| CN102930807B (en) * | 2012-08-31 | 2015-03-04 | 浙江工业大学 | Two-bus parallel LED colored bulb lamp display screen control system |
| CN109741710A (en) * | 2019-02-20 | 2019-05-10 | 昆山弘锦威电子有限公司 | Integrate backlight driving chip and LED backlight device |
| CN112437515A (en) * | 2020-05-07 | 2021-03-02 | 光宝电子(广州)有限公司 | Backlight module and operation method thereof |
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| Publication number | Publication date |
|---|---|
| CN105590589A (en) | 2016-05-18 |
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Application publication date: 20120509 |