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CN100476937C - Image display device and display device control method - Google Patents

Image display device and display device control method Download PDF

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Publication number
CN100476937C
CN100476937C CNB2005800328782A CN200580032878A CN100476937C CN 100476937 C CN100476937 C CN 100476937C CN B2005800328782 A CNB2005800328782 A CN B2005800328782A CN 200580032878 A CN200580032878 A CN 200580032878A CN 100476937 C CN100476937 C CN 100476937C
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China
Prior art keywords
transmitter
modulator
row
value
voltage
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Expired - Fee Related
Application number
CNB2005800328782A
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Chinese (zh)
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CN101031948A (en
Inventor
菲利普·勒罗伊
多米尼克·加诺特
哈桑·格尔莫德
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THOMSON LICENSING CORP
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THOMSON LICENSING CORP
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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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • 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
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3283—Details of drivers for data electrodes in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
    • 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
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
    • G09G2320/0295—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel by monitoring each display pixel
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0693—Calibration of display systems
    • 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
    • G09G2330/02—Details of power systems and of start or stop of display operation

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

The invention relates to an active matrix image display device consisting of: several light emitters (22, 23, 24); a current modulator (26) which is connected to each emitter; means (8, 14, 15) for selecting emitters (22, 23, 24); means (36, 39, 40) for powering the emitters; and an operational amplifier (35) comprising an inverting input (-), a noninverting input (+) and an output. According to the invention, either the noninverting input (+) or the inverting input (-) of the operational amplifier (35) is connected to the output (42) of the power supply means (36, 39, 40) such as to form, together with the modulator (26) gate which is connected to the output of the operational amplifier (35), a feedback loop for the operational amplifier (35), when one of the emitters (22, 23, 24) is selected. The invention also relates to a method of controlling one such display device.

Description

Image display and display device control method
Technical field
The method that the present invention relates to a kind of display device, display control circuit and be used for display image.
More specifically, the present invention relates to a kind of active array type (active-matrix) image display, this image display comprises:
-several optical transmitting sets form by the transmitter array of row with column distribution, and each transmitter can be shown the periodically addressing of value of signal, the video data of this display signal value presentation video duration;
-current modulator, be connected in series to each optical transmitting set of array, thereby form transmitter-modulator string, described modulator comprises source electrode, drain electrode, grid, more than or equal to release (trip) starting voltage of this modulator,, drain current powers for described optical transmitting set for the voltage between one in drain electrode and the source electrode and the grid thereby can passing described modulator;
The holding capacitor of-electric charge can keep the control voltage at each modulator grid place in described image persistence;
-selecting arrangement can be selected the transmitter with delegation;
-drive the luminous device of transmitter, for every row, this device comprises: be used for the device to these transmitters power supplies, this electric supply installation comprises one output terminal in the end points of each transmitter-modulator string that is connected to described row; With at least one operational amplifier, be used to control the corresponding modulating device, have inverting input (-), in-phase input end (+) and output terminal, when having selected to be connected to the transmitter of this modulator, the output terminal of described amplifier can be connected to the grid of each modulator of these row, thereby described control voltage is applied to described grid.
Background technology
Image display is used for the various application such as motor vehicles, digital camera or portable phone more and more.
Known in display device, on the basis of organic light emission unit, form optical transmitting set, such as the display device of OLED (Organic Light Emitting Diode) type.
Especially, can on market, generally obtain passive matrix (passive-matrix) OLED display device.But they consume a large amount of electric energy and have short life.
Active array type OLED display device comprises integrated electronic component, and shows the many advantages such as the compatibility of low consumption, high resolving power, video rate and life-span longer than passive matrix OLED display device.
Traditionally, these display devices comprise the active matrix that is formed by light emitter arrays particularly.Each optical transmitting set is tied to the pixel or the sub-pixel of the image that (tied to) will show, and via the array address of addressing circuit by row electrode and column electrode.
Addressing circuit specifically comprises current modulator, this current modulator can drive current by transmitter and therefore drive each pixel of display device or sub-pixel luminous.
In active matrix, these modulators are thin film transistor (TFT) TFT, and this TFT is produced from the polysilicon that produces according to low temperature polycrystalline silicon (LTPS) technology on the amorphous silicon layer basis.Yet this technology is introduced the local space that discharges starting voltage and is changed between these transistors.These variations are that the size of silicon grain and combination (bond) are not fully controlled because the following fact promptly arrives in the crystallization steps of polysilicon (Poly-Si) at amorphous silicon (Si-a).
Therefore, by the same power supplies power voltage supply and produce the electric current of varying strength by the TFT transistor of identical demonstration curtage control.In addition, the release starting voltage of thin film transistor (TFT) is tended to along with the time changes in uneven (inhomogeneous) mode.
Now, because the transmitter emission is proportional to the luminous intensity by its electric current, so the unevenness of these transistorized release threshold values (heterogeneity) causes comprising the brightness irregularities of this transistorized display device.This has caused difference and tangible user's visual discomfort between the luminous grade.
In order to limit this discomfort, the various circuit that discharge starting voltage have been proposed to be used to compensate.
For example, file EP-1340019 has described a kind of display device that comprises compensating circuit, this compensating circuit comprises operational amplifier, the output terminal of this operational amplifier is connected to the grid of modulator and the in-phase input end of this operational amplifier is connected to the anode of same each transmitter of row in succession, and does not comprise the modulator that is associated with described transmitter.
Yet this equipment is very complicated.The control of a large amount of switches of its specific requirement.
Summary of the invention
Target of the present invention is to realize better simply display device.
Given this purpose, theme of the present invention is a kind of active array type image display, it is characterized in that:, thereby utilize during in selecting described transmitter one grid of the modulator of the output terminal that is connected to operational amplifier to form the feedback loop of operational amplifier the in-phase input end of operational amplifier and a described output terminal that is connected to electric supply installation in the inverting input.
Therefore, be different from the image element circuit of describing in the file EP-1340019 that has quoted, the input end of operational amplifier is not connected to the public terminal of the transmitter-modulator string of each pixel, but is connected in the end points of this string one.
Therefore, the present invention makes it may be at least during the addressing period of these transmitters, and the electric current that is used for to the transmitter of every row is powered that directly gives an order is powered to transmitter.Advantage of the present invention is not measure this electric current and carry out this instruction.
Depend on employed display packing, in the time will showing each image or each image repeatedly, each transmitter of addressing periodically.
According to specific embodiment, this equipment comprises one or more following characteristics.
Be connected to a drain electrode or a source electrode in the described end of each transmitter-modulator string of described row of output terminal of described electric supply installation corresponding to described modulator.
Then, the output terminal transitive dependency of operational amplifier 35 is in shows signal V Data22, V Data23With the release starting voltage V that depends on the modulator 26 that is connected to selected transmitter 22,23,24 ThControl signal V cControl signal V cCan be to capacitor 30 chargings.
Be connected in the in-phase input end (+) of operational amplifier of output terminal and the inverting input (-), can receive the signal that depends on display signal value, this display signal value will be addressed to the transmitter from described column selection.
According to the first main transformer shape, described electric supply installation also comprises the driving generator, its be suitable for by to the described end of described transmitter corresponding emitter-modulator string in one drive signal is provided, thereby discontinuously in succession with power feed each transmitter to row, described drive signal depends on display signal value, and this display signal value will be addressed to the transmitter from described column selection.Therefore, drive generator only during its addressing period adjoining land power to transmitter.
Then, electric supply installation generally also comprises keeps (sustain) generator, and its function is outside their address phase, to the transmitter power supply of these row.This equipment requirements is suitable for driving generator and keeping the powered switch device that switches transmitter between the generator.In practice, therefore generally in each addressing circuit, have two extra switch, one is used for during address phase this transmitter-modulator being series-connected to the driving generator, and another is used for outside address phase this transmitter-modulator is series-connected to keeps generator.
As previously mentioned, the output terminal that drives generator is connected in the in-phase input end (+) of operational amplifier and the inverting input (-) one.Only during the transmitter that addressing should be listed as, this identical output terminal is the described end that is connected to corresponding transmitter-modulator string via being switched on the switch that is used for addressing also.
Described driving generator comprises display voltage generator and the resistive element that is connected in series, and voltage generator is suitable for generating the voltage that relies on display signal value, and this display signal value will be addressed to the transmitter from described column selection.
This resistor can be the resistor of voltage generator inside.
Utilize this resistors in series, during addressing period, in this resistor, flow through the release starting voltage that the current value that therefore flows through does not rely on the modulator that is associated with this transmitter in this transmitter.Then, this current value be proportional to the described value of shows signal on the one hand and be applied to the in-phase input end of operational amplifier and another magnitude of voltage of inverting input between poor, be inversely proportional to the resistance value of resistive element on the other hand.
According to the second preferred main transformer shape, described electric supply installation comprises the driving generator, this driving generator can provide same drive signal by in the end points of each transmitter-modulator string that is listed as, come to power continuously to whole group of transmitter of row, described drive signal depend on display signal value and, described display signal value was for before being addressed to whole group of transmitter and the current value that is addressed to whole group of transmitter of row of row in image persistence.Advantageously, do not need the generator of keeping that adds, and formerly need this to keep generator in the first main transformer shape.
Described driving generator comprises display voltage generator and the resistive element that is connected in series, and this voltage generator be suitable for producing depend on image persistence before be addressed to the display signal value of whole group of transmitter of these row and the current whole group of transmitter that is addressed to these row display signal value and voltage.
This resistor can be the resistor of voltage generator inside.In this resistor and therefore utilize this resistors in series, value of current flowing is independent of the release starting voltage of the modulator that is associated with this transmitter in this transmitter.Then, current value be proportional on the one hand described shows signal value and and be applied to poor between another the magnitude of voltage of the in-phase input end of operational amplifier and inverting input, be inversely proportional to the resistance value of resistive element on the other hand.
Do not comprise switchgear between its each in the end points of the output terminal of described electric supply installation and the transmitter of these row-modulator string.Advantageously, compare with the first main transformer shape, simplified the addressing circuit of transmitter, this is because no longer need alternately to switch in the end points of transmitter-modulator string one between the different driving generator, and this needs in the first main transformer shape.
The output terminal that drives generator is connected in the in-phase input end (+) of operational amplifier and the inverting input (-) on the one hand, is not connected to the described end points of corresponding transmitter-modulator string with having intermediate switch on the other hand.
Voltage generator is connected to resistive element, to be delivered in the drive current that obtains on the basis that concerns below:
I = ( Σ n = 1 p V data n ) - V ref n R
Wherein R is a resistive element,
V Ref nBe the reference voltage that is associated with transmitter n, and
V Data nBe the value that is addressed to the display voltage of transmitter n, and
P is the total number of the transmitter in the row.
Described drive unit also comprises can be to the reference generator of the inverting input (-) of operational amplifier and another transmission reference signal in the in-phase input end (+).
Each transmitter shows specific electrical characteristics and/or light characteristic, and the value of each reference signal depends on described electrical characteristics and/or light characteristic.
Each transmitter is associated with colour light emitting, and can come modulating reference signal as the function of the color of the transmitter that is assigned to described selection.
Traditionally, by the given white color of trichromatic coordinate mark.Utilize the present invention, the color performance of optimizing equipment easily, and the aging difference between can the compensate for emission device.
Transmitter is grouped into the many groups adjacent transmitter that is suitable for each emission different colours, and for every group, as follows described reference signal is distributed to each transmitter of this group, promptly caused by the described white color of this group emission by same these transmitters of display signal value addressing.
Described driving arrangement also comprises data storage device, and this data storage device can be stored display signal value, is addressed to each transmitter at this display signal value of image persistence.
Theme of the present invention also is a kind of method of active array type image display, this active array type image display comprises: several optical transmitting sets, form and press the transmitter array that row and column distributes, each transmitter can be shown periodically addressing of signal value, and this display signal value is illustrated in the video data of image persistence; Current modulator comprises source electrode, drain electrode, grid, a transmitter that is connected in series to array in the drain electrode of each modulator or the source electrode, thus form the transmitter-modulator string that comprises two end points; Selecting arrangement can select transmitter capable; The holding capacitor of electric charge can keep the control voltage at the grid place of described or each modulator in described image persistence; Drive the luminous device of transmitter of row, comprise that at least one has the operational amplifier of inverting input, normal phase input end and output terminal; This method comprises the following steps:
-select signal (V by selecting arrangement to the capable transmission of transmitter Select);
-apply drive signal (I) by drive unit in the end points of each transmitter-modulator string of row;
-apply control signal (V by drive unit to the grid of each modulator that is connected to selected transmitter c),
It is characterized in that it also comprises the following steps:
-select transmitter capable, so that utilize the output terminal be connected to operational amplifier modulator grid and utilize the in-phase input end of described operational amplifier of described output terminal of the electric supply installation that is connected to these transmitters and inverting input in one, form the feedback loop of described operational amplifier.
According to specific embodiment, this method comprises following characteristics, that is: drive signal depend on image persistence be addressed to row whole group of transmitter shows signal value and.
Description of drawings
The description that only provides and provide with reference to the accompanying drawings below the reading by by way of example, the present invention may be better understood for the general, in the accompanying drawing:
-Fig. 1 is the synoptic diagram according to display device of the present invention;
-Fig. 2 is the synoptic diagram of the part of the display device represented among Fig. 1;
-Fig. 3 is that the process flow diagram according to some steps of control method of the present invention represented in summary;
-Fig. 4 is that expression is applied to the time distribution map according to the selection voltage of the selection electrode of first addressing circuit of display device of the present invention;
-Fig. 5 is that expression is applied to the time distribution map according to the selection voltage of the selection electrode of second addressing circuit of display device of the present invention;
-Fig. 6 be expression that generator produces by driving, be used for addressing in succession according to each addressing circuit of the same row of display device of the present invention, the time distribution map of the display voltage of first circuit and second circuit particularly;
-Fig. 7 is the time distribution map of drain current that the modulator of first addressing circuit is flow through in expression;
-Fig. 8 is that the time distribution map according to the drain current of the modulator of second addressing circuit of display device of the present invention is flow through in expression;
-Fig. 9 is the time distribution map of expression by the drive current that produces according to the driver element of display device of the present invention;
-Figure 10 is the synoptic diagram of first variant embodiment of the part of representing in Fig. 2 of display device;
-Figure 11 is the synoptic diagram of second variant embodiment of the part of representing in Fig. 2 of display device;
-Figure 12 comprises that expression is as the diagram that is applied to according to the curve of electric current function, that flow through them of the voltage of the terminal of each transmitter of display device of the present invention;
-Figure 13 is the synoptic diagram of the 3rd variant embodiment of the part of representing in Fig. 2 of display device.
Embodiment
Fig. 1 represents according to image display of the present invention.The latter is made of the active matrix 1 that control device 2 drives.
In a manner known way, active matrix 1 comprises a plurality of addressing circuits 3,4,5,6, each be associated with the transmitter (not shown) and according to the row and column distribution.
The control device 2 of active matrix comprises control system 7, selects control circuit 8 and addressing control circuit 10.
Control system 7 can receive image display signal, can handle this signal (for example, decoding and decompression) and transmit shows signal to selection control circuit 8 transmission synchronizing signals and to addressing control circuit 10.
Select control circuit 8 to be connected to a plurality of column electrodes 14,15, each and transmitter line correlation join.One receives synchronizing signal, and circuit 8 is suitable for producing strobe pulse V at each column electrode 14 in succession Select, with the corresponding sweep frequency of image persistence under, select the whole group addressing circuit 3,6 of this row at first successively.Strobe pulse V SelectIt is the logical data that is used to select transmitter.
Addressing control circuit 10 is connected to a plurality of row electrodes 16,17 and a plurality of drive electrode 18,19, and each is associated with transmitter row 21A, 21B.It comprises a plurality of addressing driver element 20A, 20B, and each can be by row electrode 16,17 and drive electrode 18,19 addressing and to addressing circuit 3,4,5,6 power supplies of row 21A, 21B.
Column electrode 14,15, row electrode 16,17 and drive electrode 18,19 make and select respectively, the addressing, specific circuit in the set of circuits 3,4,5,6 of addressing display devices and become possibility to this addressing, specific circuit supply.
Therefore, by the column electrode 14 of only selecting display device, and can transmit control voltage V by activating cTo electrode 16 with can transmit the driver element 20A of drive current I to the electrode 18 of row 21A, activate the electrode 16 of the electrode that is positioned at this row 14 and this row transmitter 21A and the circuit 3 of the infall of electrode 18, and do not activate same row other circuit 4 ..., 5.
Fig. 2 represents optical transmitting set 22,23,24, and each is associated with the addressing circuit 3,4,5 of one group of pixel of transmitter row 21A and the addressing driver element 20A of these transmitter row 21A and the selection control circuit 8 of addressing driving circuit 3,4,5,6.
The transmitter the 22,23, the 24th of display device, Organic Light Emitting Diode.They comprise anode and negative electrode.The structure of these diodes is " traditional ", that is to say that anode is a lower level, and in substrate side, negative electrode is than the upper strata.
These transmitter emissions are proportional to the luminosity of the electric current that flows through them.Each this pixel of transmitter primordial.These base pixels have same alike result (same color emission) under the situation of monochrome screen, perhaps under the situation of color/graphics with the formal construction of red, green and blue triplets (trios).
In framework of the present invention, the transmitter group 22,23,24 of row is associated with the sub-pixel of same color.The transmitter of three adjacent column is associated with color redness, green, blueness in succession.Change as the function of the I-E characteristic of these transmitters for the electric current that makes identical value passes transmitter 22,23,24 needed bias voltages, and change as the function of the color of the sub-pixel that is associated with the transmitter 22,23,24 of every row particularly.
Because the addressing circuit 3,4,5 of active matrix 1 is identical, will only describe circuit 3 in detail.
Switch 28, holding capacitor 29 and power electrode 30 that circuit 3 comprises current modulator 26, formed by transistor.
Current modulator 26 and switch 28 are thin film transistor (TFT)s, and it is deposited on the technology of polysilicon (Poly-Si), amorphous silicon (a-Si) or monocrystalline silicon (μ c-Si) in the thin layer on the glass substrate (glass substrate) based on utilization.This element comprises three electrodes: drain electrode and source electrode, flow through the modulating current that is called as drain current between them; And gate electrode, will control voltage V cBe applied to this electrode.
The source electrode of modulator 26 is connected to the anode of transmitter 22, by this way modulator 26 and transmitter 22 is connected in series.With one 31 in the end points of this string, be the drain electrode of modulator 26 here promptly, be connected to drive electrode 18.With the grid of modulator 26, be connected to the first terminal of capacitor 29 on the one hand, be connected to the electric current of switch 28 through electrode (drain electrode or source electrode) via electric wire 33 on the other hand.Another electric current of switch 28 is connected to row electrode 16 through electrode (drain electrode or source electrode).The grid of switch 28 is connected to column electrode 14.Second terminal of each capacitor 29 of this group circuit 3,4,5 of row 21A is connected to power electrode 30.At last, with the other end 32 of each modulator-transmitter string, be the negative electrode of transmitter 22 here promptly, be connected to power electrode 34.Two power electrodes 30 and 34 can be connected to same electromotive force by the lead (not shown) together.
The modulator of representing among Fig. 2 26 is n types, thus when when operation its drain current it drain electrode and its source electrode between flow through.Merit attention, this equipment also can be used to drive the TFT of the p type of the diode that still has traditional structure as shown in figure 10.
Be arranged in the grid and the capacitor between the source electrode 29 of modulator 26, be suitable for the duration of image T1, T2 in the corresponding time interval in basic to keep the control voltage of the grid of modulator 26 be constant, thereby in this duration, keep the brightness of transmitter.
As known in the art, power electrode 30 can be provided to the required voltage that is biased into desired potential a terminal of capacitor 29.
Modulate driver element 20A, thereby compensate the release starting voltage V of each modulator 26 of this group addressing circuit 3,4,5 that is listed as 21A with the feedback loop of after this describing ThAnd transmitter 22,23,24 power supplies to transmitter row 21A.
For this reason, it comprise have inverting input-, in-phase input end+and the operational amplifier 35 of output terminal.The output terminal of this amplifier 35 is connected to row electrode 16, and its in-phase input end+be connected to drive electrode 18, to guarantee transmitter power supply via the modulator that is associated with the transmitter of these row to these row.Therefore, this in-phase input end+be connected to simultaneously anode of each transmitter 22,23,24 of row 21A via the modulator 26 that is associated of each transmitter 22,23,24 with row 21A.
Therefore, when the switch 28 of the addressing circuit 3,4,5 of transmitter row 21A is connected, form the feedback loop of amplifier 35 by end points 31, modulator 26, line 33 and the row electrode 16 of drive electrode 18, modulator-transmitter string at every turn.Should be noted that in the embodiment that Fig. 2 and Figure 10 present of forming in the drain electrode of end points 31 and the modulator of this string of modulator-transmitter string of a feedback loop part or the source electrode is corresponding.
Amplifier 35 can be operated in feedback, and the therefore release starting voltage V of each modulator 26 of the addressing circuit 3,4,5 of compensate for emission device row 21A Th, as in description, explaining subsequently.
In addition, the transmitter 22,23,24 that driver element 20A can addressed column 21A and by transmitter 22,23,24 power supplies of drive current I to row 21A.This electric current I depends on the display voltage V of the transmitter 22,23,24 that is addressed to these row 21A Data22, V Data23, V Data24Value and.
For this reason, it comprises drive current generator 36 and pedestal generator 38, they be connected respectively to the in-phase input end of amplifier 35+and inverting input-.
Form current feedback circuit 36 by the variable voltage generator 39 that is connected in series to resistor 40.Drive electrode 18 be connected to resistor 40 output terminal, be connected to node 42, therefore form an output terminal of current feedback circuit 36.
Generator 39 is variable voltage generators, and its voltage is as shows signal V Data22, V Data23Value function and change, the value of this shows signal will be addressed to transmitter 22,23, as explaining in description subsequently.
Generator 38 be suitable for being delivered in during the setting of display device fixing and are generators of specific reference voltage for every row.As distortion, also may utilize the variable voltage generator; The variation of reference voltage is the function of the transmitter row 21A that is addressed, will describe in description subsequently.
The output terminal of generator 38 alternatively via resistor 44 be connected to the inverting input of amplifier 35-.For the operation of driver element 20A, this resistor 44 is not absolute necessary.It only has the favourable function of balance between two input ends of operational amplifier 35.
Equally alternatively, capacitor 46 be connected the inverting input of amplifier 35-and the output terminal of this amplifier between.Resistor 44 and capacitor 46 constitute compensation to be arranged, and this compensation is arranged and made the accuracy and the stability that advantageously improve circuit become possibility.
Driver element 20A also comprises the control module 50 of data storage device 48 and generator 38 and generator 39.
Memory storage 48 comprises database 52, and this database 52 is suitable for being stored on the one hand the shows signal V of each transmitter 22,23 that is addressed to row 21A in the previous image persistence T1 process Data 22, V Data23Value, and storage is used to discern or locate the data of addressing transmitter 22,23 on the other hand, wherein transmitter 22,23 transmitter that has been addressed to of this value just.
Memory storage 48 also comprises catalogue 54, and this catalogue 54 is suitable for storing the reference voltage value that is associated with this group transmitter that is listed as 21A.This value depends on color redness, the green or blue that is associated with the transmitter 22,23 that is listed as 21A.
As can in Figure 12, finding out, show different I-E characteristics with the transmitter that different colours is associated.Therefore, be necessary different voltage is applied to the terminal of the terminal of red emission device and blue emitter so that obtain same brightness and the identical value of the electric current that flows through these transmitters.
Here, as the function of color of the transmitter of row 21A, the reference voltage value of the catalogue 54 of fixing every row.During the display device of carrying out is provided with, in factory, carry out this operation before display device is delivered for use.Set up these reference values, thus the variation between the current-voltage electrical characteristics of the various transmitters of compensation equipment and/or the characteristics of luminescence, as described later.
Usually, because these characteristics mainly depend on the color that transmitter sends, three different reference voltage values will be arranged: to the first public value V of red emission device group of first row Ref.R, to the green emitter group of secondary series public second the value V Ref.G, and to tertial blue emitter group public the 3rd the value V Ref.BAccording to more complicated distortion, for every row of transmitter, these reference voltage values are specific, thus even the current-voltage electrical characteristics between them and/or the variation of the characteristics of luminescence when transmitter of each row of compensation has identical glow color.
Only ought be addressed to the shows signal V of transmitter DataBe higher than the reference voltage V that is associated with it RefThe time, electric current just can flow through transmitter.For fear of the shows signal that must use too high value, during display device is provided with, will preferably set up the minimum possible values of reference voltage, and still obtain the compensation expected.
Control Component 50 is connected to memory storage 48, with search and recorded information in described device.
In addition, assembly 50 can receive the shows signal that is transmitted by system 7, and can come control generator 38 and 39 as this signal and the function that is stored in the information in the memory storage 48.
When operation, 22,23,24 groups of transmitters that circuit 8 and 10 can addressing matrix 1 and to its power supply, and 22,23,24 groups of the transmitters of selection matrix 1 in succession.
In the process of the step 60 in being illustrated in Fig. 3, when the first picture frame T1 began, switch one was connected, and driving circuit 20A and circuit 8 be first transmitter 22 luminous of control row 21A just.This step 60 comprises that step 62 is to 69.
In the process of step 62, circuit 8 produces strobe pulse V at column electrode 14 places Select22This pulse that is illustrated among Fig. 4 can be connected switch 28.
Concurrently, in the process of step 64, the reference voltage of assembly 50 inquiry catalogues 54 to determine to be associated with the row of transmitter 22.Particularly, this reference voltage depends on the color of the sub-pixel that is associated with the transmitter 22,23,24 of these row.
During step 66, assembly 50 control generators 38 make the latter transmit the reference voltage V at the transmitter of row 21A Ref21A, the value of this reference voltage is constant and equal V Ref a
Concurrently, in the process of step 68, assembly 50 receives the display voltage V that will be addressed to transmitter 22 from control system 7 Data22Value V aSign or position with the transmitter 22 of the addressing that is associated with this value.Then, assembly 50 should be worth V aAnd the identification record of the transmitter that is addressed to of this value is in database 52.
Simultaneously, in the process of step 69, assembly 50 control generators 39 make the latter produce the display voltage V that will be addressed to transmitter 22 Data22Value V a, as shown in Figure 6.
Therefore, generator 38 will equal V Ref aReference voltage V Ref21ABe provided to the inverting input of amplifier 35-.Simultaneously, generator 39 is with the V that equals shown in Figure 6 aVoltage V Data22Be provided to resistor 40.This voltage V aProduce drive current I=I 22, be introduced into the drain electrode of modulator 26 by drive electrode 18.This drive current I=I that in Fig. 7, represents 22By following contextual definition:
I 22 = V a - V ref a R
V wherein aBe the display voltage V that produces by generator 39 Data 22Value, V Ref aBe that R is the value of resistor 40 by the value of the reference voltage of generator 38 generations.Should be noted that optional resistor 44 does not enter during electric current calculates, this be because do not have tangible electric current, at least about drive current I 22Value, flow through this resistor.
The modulator 26 that consideration is connected in series to the circuit 3 of first transmitter 22 operates in (V in its saturation mode Gs-V Th＜V Ds), equal drive current I by its drain current, and relation of plane is set up down:
I = I 22 = k ( V gs - V th ) 2
= V a - V ref a R
I wherein 22Be drain current by modulator 26, V GsBe the grid of modulator 26 and the voltage between the source electrode, k is the constant that depends on the inherent characteristic of modulator 26, V ThBe the release starting voltage of modulator 26, and V DsBe the drain electrode of modulator 26 and the voltage between the source electrode.
Utilization is according to feedback loop of the present invention, the inverting input of amplifier 35-and in-phase input end+between electric potential difference disappear.Then, the voltage of node 42 equals V Ref aTherefore amplifier 35 controls voltage V to the grid transmission of modulator 26 c, it automatically is modulated to a value, makes electric current I=(V a-V Ref a)/R passes the modulator 26 and the transmitter 22 of series connection, so the release starting voltage of this electric current and modulator 26 is irrelevant.Therefore directly obtained compensation, and do not comprised measurement the electric current by this transmitter to the release starting voltage of the transmitter 22 of equipment.
According to control voltage V cThe value value of deriving V automatically Gs
Control voltage V cValue not only depend on the shows signal V of transmitter Data22With the reference voltage V that is associated with this transmitter Ref a, also depend on the release starting voltage V of modulator 26 Th
When generator 39 has been forced display voltage V Data22Value V aThe time, because generator 38 has been forced voltage V Ref a, because the architectural characteristic of modulator 26 is discharged starting voltage V ThBe intrinsic, so adjust and modulate the control voltage V of the grid that is applied to modulator 26 by amplifier 35 cThereby, compensated the release starting voltage V of this modulator Th
Therefore, the control voltage V of the output terminal of modulated amplifier 35 accurately cFor utilizing display voltage V Data 22Value V aThe voltage that addressing transmitter 22 is required, and with the release starting voltage V of modulator 26 ThValue irrespectively carry out this modulation, even and described voltage to change also be like this along with the time.
Then, in the excess time of image persistence, keep this control voltage by capacitor 29 at the grid place of modulator 26, and the switch 28 of circuit 3 is disconnected once more, just as be known in the art.
In the process of step 70, light second transmitter 23 of row 21A.Step 70 comprises that step 72 is to 79.
In the process of step 72, the strobe pulse V that circuit 8 is represented in column electrode 15 transmits such as Fig. 5 Select23
In the process of step 74, assembly 50 is determined the reference voltage V that is associated with the row of transmitter 23 by inquiring memory storage 48 Ref21ABecause transmitter 23 and transmitter 22 be in same row, and since these transmitters all be associated with same color, so this reference voltage V Ref21AValue V Ref aEqual the reference voltage V of generation during addressing first transmitter 22 Ref22Value V Ref a
In the process of step 76, assembly 50 control reference generators 38 make the latter be created in the voltage V that determines during the step 74 Ref a
Concurrently, in the process of step 77, assembly 50 receives from system 7 will be addressed to display voltage V transmitter 23 and that represent among Fig. 6 Data23Value V b, and the sign or the position of the transmitter that is addressed 23 that is associated with this value, and it is recorded in the database 52.
In the process of step 78, assembly 50 will before be addressed to the display voltage V of the transmitter 22 of same row Data22Value V aWith the display voltage V that will be addressed to next transmitter 23 Data 23Value V bAddition.
Then, in the process of step 79, assembly 50 control generators 39 make the latter transmit to equal the display voltage of the magnitude of voltage that calculates, i.e. V during step 78 a+ V b
Therefore, represent in Fig. 9 that the new drive current that flows through resistor R and drive electrode 18 becomes I=I 23+ I 22, wherein the common point of resistor R and drive electrode 18 be connected to the in-phase input end of amplifier 35+, and by following contextual definition:
I = I 22 + I 23 = V data 22 + V data 23 - V ref a R
Light transmitter 22 needed electric current I 22=(V Data22-V Ref a)/R continues to modulator 26 power supplies.Particularly, because the switch 28 of circuit 3 is to disconnect now, so keep same control voltage V by capacitor 29 rather than by amplifier 35 at the grid place of the modulator 26 of first circuit 3 cThis voltage V cControl makes this intensity equal the intensity of programming in the process of step 60 to the strength of current of transmitter 22 power supplies.
Residual current I on the drive electrode 18 23=I-I 22=V Data23/ R gives modulator 26 power supplies of second circuit 4.Because in the process of step 72, the switch 28 of circuit 4 has been connected, so the line 33 of the modulator 26 of the end points 31 of row electrode 16, amplifier 35, drive electrode 18, modulator-transmitter string, second circuit 4 and second circuit 4 forms the new feedback loop of amplifier 35.Therefore, from the control voltage V of amplifier 35 cCompensate the release starting voltage V of the modulator 26 of second circuit 4 as previously Th
By carry out the step of similar step 72 to 79 for each addressing circuit 3,4,5 of row 21A, in the process of the first identical picture frame duration T 1, whole group of transmitter 22,23,24 by addressed column 21A continues to carry out the method according to addressing display device of the present invention.Particularly, database 52 is included in the process of this first picture frame the value V of the display voltage of p each transmitter that is addressed to row 21A then Data.n, and assembly 50 control generators 39, make the latter transmit display voltage V = Σ n V data . n . Then, flow through the drive current I of drive electrode 18 by following total relation definition:
I = Σ n I n = ( Σ n = 1 p V data . n ) - V ref 21 A R
Wherein:
I is by driver element 20A drive current that produce and that flow through drive electrode 18;
I nIt is the electric current that flows through transmitter n;
V Data nIt is the value that is addressed to the image display voltage of transmitter n;
V Ref21AIt is value with the reference voltage that is associated of transmitter of row 21A; And
P is the number of the transmitter among the row 21A.
After image persistence T1, whole group of transmitter 22,23,24 conducts of row 21A indicate to be lighted by the function of the display voltage of the view data of these transmitter demonstrations, and in the process of step 80, circuit 3 is addressed for the second time.This step 80 comprises that step 82 is to step 89.
Step 82,84,86,87,88 and 89 is equal to step 62,64,66,68 and 69 respectively, and no longer is described.For this addressing for the second time of circuit 3, adjust these steps and make assembly 50:
-from being received in the process of previous picture frame, database 52 before had been addressed to the display voltage V of transmitter 22 Data22Value V a, and receive the display voltage V ' that will be addressed to transmitter 22 from system 7 Data22New value V ' a, and should newly be worth V ' aBe recorded in the database 52 with replace old value V a
-from
Figure C20058003287800193
In deduct old value V aAnd will newly be worth V ' aBe added on it.
Assembly 50 control generators 39 then, make the latter transmit to equal to be calculated and
Figure C20058003287800194
The display voltage of new value.
The addressing second time of executive circuit 4 in the same manner.After image persistence T2, the function of the display voltage of the new image data that the whole group of transmitter 22,23,24 of row 21A shown by these transmitters as indicating and lighting.
Then as picture frame T2 followed by picture frame T1, other picture frame is followed by previous picture frame.
In one exemplary embodiment of the present invention, as shown in Figure 6, in the process of image persistence T1, will equal V Ref aReference voltage V Ref22Value be applied to the inverting input of amplifier 35-, and will equal V aDisplay voltage V Data22Value be addressed to transmitter 22.In the process of new image persistence T2, continue this value V of addressing voltage a
Therefore, in the process of the second image persistence T2, not do not revise and
Figure C20058003287800201
And be not modified in the process of previous image persistence T1 capacitor 29 charge stored by circuit 3.
Equally, during the step of lighting transmitter 23 (not shown in Fig. 3), first and the process of previous image persistence T3 (Fig. 6) in, the value that is addressed to the display voltage of transmitter 23 equals V b, in the process of next image persistence T4, this value that is addressed to the display voltage of transmitter 23 equals 0 then.
Therefore and
Figure C20058003287800202
Reduced value V simply Data, make and eliminated the whole electric charges that on the capacitor 29 of circuit 4, accumulate, and make the latter show zero potential, the feature of the diode of promptly not lighting.
Advantageously, this display device and this display packing make and avoided initial phase to become possibility before programming addressing circuit 3,4,5 as can be seen.
Advantageously, utilize one of the input end be applied to amplifier 35 and for every row transmitter or for as many groups of row of many here group different colours are specific reference voltages, the advantageously feasible consumption that reduces display device becomes possibility.Particularly, if the value of coming selection reference voltage not only in the mode of the variation of the electrical characteristics of transmitter of each row of compensation and/or the characteristics of luminescence, also, then can correspondingly move and reduce the value V of shows signal to obtain the value that mode that every row reference voltage minimum may mean value is come selection reference voltage Data, therefore reducing will be by the electric power of power source generator 39 generations.
Under the situation of the Fig. 2 of the OLED display device with traditional structure, form active matrix 1 interface be the anode of transmitter 22,23 (diode) with " tradition " structure: drain electrode (n type situation) or the source electrode (p type situation) with modulator 26 is connected to drive electrode 18 then, and the negative electrode of transmitter 22,23 is connected to electrode 34.Then, drive electrode 18 is connected to node 42, at the normal phase input end of one of the output terminal of this place's electric supply installation 36 and amplifier 35+link together.
Yet, as shown in figure 11, the present invention also is applied to have the display device of so-called inverted structure, wherein the negative electrode of transmitter forms the interface of active matrix: drain electrode (p type situation) or the source electrode (n type situation) with modulator 26 is connected to drive electrode 18 then, and the anode of transmitter 22,23 is connected to electrode 34.Drive electrode 18 is connected to node 42, the inverting input of and amplifier 35 current at one of output terminal of this place's supply unit 36-link together.This circuit is more stable than the circuit of describing about the diode with traditional structure, advantageously, does not need resistor 44 or any balance and/or compensation condenser 46 now.Then, shows signal is corresponding to negative voltage, and " pulls out " electric current of diode from power electrode 34.
As distortion, generator 38 can be changed reference voltage as the aging function of transmitter, perhaps can reduce this reference voltage in the low consumption pattern.
As distortion, reference voltage is associated with every row transmitter.In this case, memory storage 48 comprises the database of the value that can store the reference voltage that will be applied to every row transmitter.Driver element 50 be suitable for searching for as the function of the sign of this transmitter row or position this database with the inverting input that obtains being applied to amplifier 35-the value of reference voltage.
According to the present invention, during the setting before equipment enters service, preferably set up poor (V with the electrical characteristics that compensate each transmitter row and/or the mode of the difference in the characteristics of luminescence Ref x-V Ref y).
A part that shows the display device of the 3rd variant embodiment among Figure 13 according to the present invention.
The identical electronic package of electronic package this display device and display device shown in Figure 2 is represented with identical Reference numeral.
This display device comprises addressing circuit 103, and it is connected to addressing driver element 20A by row electrode 16 and drive electrode 18 on the one hand, is connected to by column electrode 14 on the other hand and selects circuit 8.
Circuit 103 is suitable for addressing transmitter 22 and powers to transmitter 22, and the negative electrode of transmitter 22 is connected to power electrode 34.
Three switches 28,106,108, holding capacitor 29 and ground-electrode 110 that circuit 103 comprises current modulator 26, formed by transistor.
The drain electrode of modulator 26 is connected to the anode of transmitter 22, thereby is connected in series modulator 26 and transmitter 22.The grid of modulator 26 is connected to first end of capacitor 29 on the one hand, is connected to an electric current of switch 28 by electrode (drain electrode or source electrode) by electric wire 33 on the other hand.Another electric current of switch 28 is connected to row electrode 16 by electrode (drain electrode or source electrode).The grid of switch 28 is connected to column electrode 14.Second end of capacitor 29 is connected to ground-electrode 110.The source electrode of modulator 26 is connected to the drain electrode of switch 108 on the one hand, and an electric current that is connected to switch 106 on the other hand is by electrode (drain electrode or source electrode).The source electrode of switch 108 is connected to ground-electrode 110.The grid of switch 108 is connected to column electrode 14.Another electric current of switch 106 is connected to drive electrode 18 by electrode (drain electrode or source electrode).The grid of switch 106 is connected to column electrode 14.
Part has shown driving circuit 20A.It comprises the assembly identical with driving circuit shown in Figure 2, and operation in an identical manner.
Drive electrode 18 is connected to the reverse input end and the resistor 40 of operational amplifier 35.
Row electrode 16 is connected to the output terminal 35 of operational amplifier.
Driving circuit 20A is suitable for powering to each transmitter 22 of circuit 103 discontinuously in succession, to pass through circuit I 21Be delivered to one of the end points of transmitter 22-modulator 26 string and addressed column 21A.
The in-phase input end of operational amplifier 35 is suitable for receiving the reference voltage of the transmitter 22 that is used to be listed as 21A, and the value of this reference voltage depends on the color of the sub-pixel that is associated with the transmitter 22 of these row.
Be addressed to the display voltage V of transmitter 22 DataBe provided for resistor 40.This voltage generates and is applied to the drive current of the electric current of switch 106 by electrode.
Addressing circuit 103 refresh the stage during, column electrode 14 is in logic state 0, thus switch 28 and 106 disconnects, and switch 108 is connected.
Form the feedback loop of amplifier 35 by drive electrode 18, switch 106, modulator 26 and switch 28.This feedback loop allows the electric current I of steady flow through drive electrode 18 21AThereby described electric current satisfies following equation:
I 21A＝(V 21A-V ref)/R
The release starting voltage of the grid of amplifier 35 compensating for modulator 26 that under feedback model, move, and irrelevant with the characteristic of modulator 26.
Then, the store voltages on modulator 26 grids is in capacitor 29.
At storaging current I 21AStage during, therefore column electrode 14 switches to logic state 1, and switch 28 is connected with 106, and switch 108 disconnections.
Advantageously, through from refreshing the stage during the memory phase, the voltage on the drain electrode of modulator 26, source electrode and the gate electrode does not change, so through from refreshing the stage during the memory phase, the identical electric current transmitter 22 of flowing through.
Advantageously, make it finally to control the electric current of the transmitter 22 of flowing through, generate accurate grid scale (grid scale), brightness uniformly and low noise thus, even also like this on high-resolution screen according to this equipment of third embodiment of the invention.
Advantageously, do not compare with there being the feedback display device, the required time of this display device of programming is shorter. Advantageously, this display device allows the wide diffusion of characteristic, especially aspect the threshold voltage of modulator 26.

Claims (16)

1. an active matrix image display device (1) comprising:
-several optical transmitting sets (22,23,24) form and press the transmitter array that row and column (21A, 21B) distributes, the value (V of shows signal Data22, V Data23) to periodically be addressed to each transmitter (22,23,24), the video data of this value representation image persistence (T1, T2, T3, T4); And
-current modulator (26), each optical transmitting set (22,23,24) that is connected in series to described array is to form transmitter-modulator string, described modulator (26) comprises source electrode, drain electrode, grid, for the release starting voltage (V of the voltage between source electrode and the grid more than or equal to this modulator Th), drain current can pass described modulator to power to described transmitter (22,23,24); And
The holding capacitor of-electric charge (29) can keep the control voltage at each modulator (26) grid place at described image persistence (T1, T2, T3, T4); And
-selecting arrangement (8,14,15) can be selected the transmitter (22) with delegation; And
The luminous device (20A, 35,36,38,39,40,48) of the described transmitter of-driving, (21A) comprising for every row: be used for the device (36,39,40) to these transmitters (22,23,24) power supplies, this electric supply installation comprises one output terminal (42) in the end points (31,32) of each transmitter-modulator string that is connected to described row (21A); With at least one operational amplifier (35), be used to control corresponding modulating device (26), have inverting input (-), in-phase input end (+) and output terminal, when the transmitter of having selected to be connected to this modulator (26) (22,23,24), described amplifier (35) output terminal can be connected to the grid of each modulator (26) of these row (21A), thereby described control voltage is applied to described grid;
It is characterized in that: an output terminal (42) that is connected to described electric supply installation (36,39,40) in the in-phase input end (+) of described operational amplifier (35) and the inverting input (-), thereby during in having selected described transmitter (22,23,24) one, form the feedback loop of described operational amplifier (35) with the grid of the described modulator (26) of the output terminal that is connected to described operational amplifier (35).
2. equipment as claimed in claim 1 is characterized in that: be connected to a drain electrode or a source electrode corresponding to described modulator (26) in the described end points (31,32) of each transmitter-modulator string of described row (21A) of output terminal (42) of described electric supply installation (36,39,40).
3. equipment as claimed in claim 1 or 2 is characterized in that: one that is connected in the in-phase input end (+) of described operational amplifier (35) of described output terminal (42) and the inverting input (-) can receive the value (V that depends on shows signal Data22, V Data23) signal, the value of this shows signal will be addressed to the transmitter of selecting from described row (21A) (22,23,24).
4. equipment as claimed in claim 1 or 2, it is characterized in that: described electric supply installation (36,39,40) also comprises driving generator (36,39,40), described driving generator (36,39,40) be suitable for by to the described end points (31,32) of described transmitter corresponding emitter-modulator string in one drive signal (In) is provided, in succession to each transmitter (22,23,24) power supply of row (21A), described drive signal (In) depends on the value (V of shows signal discontinuously Data22, V Data23), this value will be addressed to the transmitter of selecting from described row (21A) (22,23,24).
5. equipment as claimed in claim 4 is characterized in that: described driving generator (36,39,40) comprises the display voltage (V that is connected in series Data22, V Data23) generator (39) and resistive element (40), and this voltage generator (39) is suitable for producing the value (V that depends on shows signal Data22, V Data23) voltage, the value of this shows signal will be addressed to the transmitter of selecting from described row (21A) (22,23,24).
6. equipment as claimed in claim 1 or 2, it is characterized in that: described electric supply installation (36,39,40) also comprise driving generator (36,39,40), described driving generator (36,39,40) can be by described end points (31 to each transmitter-modulator string that is listed as (21A), 32) one in provides same drive signal (I), come continuously to the whole group of transmitter (22 that is listed as (21A), 23,24) power supply, described drive signal (I) depends at image persistence (T1, T2, T3, T4) before be addressed to and the current whole group of transmitter (22 that is addressed to row (21A), value (the V of shows signal 23) Data22, V Data23) and.
7. equipment as claimed in claim 6 is characterized in that: described driving generator (36,39,40) comprises the display voltage (V that is connected in series Data22, V Data23) generator (39) and resistive element (40), and voltage generator (39) is suitable for producing depending in image persistence (T1, T2, T3, T4) and before had been addressed to and the value (V of the shows signal of the current whole group of transmitter (22,23) that is addressed to row (21A) Data22, V Data23) and voltage.
8. equipment as claimed in claim 7 is characterized in that: it does not comprise switchgear between each end points of the output terminal of described power-supply unit and the transmitter of described row-modulator string.
9. equipment as claimed in claim 7 is characterized in that: voltage generator (39) is connected to resistive element (40), to be delivered in the drive current (I) that obtains on the basis that concerns below:
I = ( Σ n = 1 p V data n ) - V ref n R
Wherein R is resistive element (40),
V Ref nBe the reference voltage that is associated with transmitter n, and
V Data nBe the value that is addressed to the display voltage of transmitter n, and
P is the total number of the transmitter in the row.
10. equipment as claimed in claim 1 or 2, it is characterized in that: described drive unit (20A, 35,36,38,39,40,48) also comprises reference generator (38), and this reference generator can be to the inverting input (-) of operational amplifier (35) and another transmission reference signal (V of in-phase input end (+) Ref).
11. equipment as claimed in claim 10 is characterized in that: each transmitter (22,23,24) shows specific electrical characteristics and/or light characteristic, and each reference signal (V Ref) value depend on described electrical characteristics and/or light characteristic.
12. equipment as claimed in claim 10 is characterized in that: each transmitter (22,23,24) is associated with the luminous of color, and can be as the FUNCTION MODULATION reference signal (V of the color of the transmitter that is assigned to described selection (22,23,24) Ref).
13. equipment as claimed in claim 10 is characterized in that: described transmitter (22,23,24) is grouped into many group adjacent transmitter (22,23,24), is suitable for each emission different colours, and for every group, as follows with described reference signal (V Ref) distribute to each transmitter of this group, promptly by same display signal value (V Data22, V Data23) these transmitters of addressing cause by this group emission white color.
14. equipment as claimed in claim 1 or 2 is characterized in that: described driving arrangement (20A, 35,36,38,39,40,48) also comprises data storage device (48), and this data storage device (48) can be stored described display signal value (V Data22, V Data23), be addressed to each transmitter (22,23) at this display signal value of image persistence (T1, T2, T3, T4).
15. the control method of an active matrix image display device (1), this active matrix image display device comprises: several optical transmitting sets (22,23,24) form and press the transmitter array that row and column (21A, 21B) distributes, display signal value (V Data22, V Data23) to periodically be addressed to each transmitter (22,23), this display signal value is illustrated in the video data of image persistence (T1, T2, T3, T4); Current modulator (26) comprises source electrode, drain electrode, grid, a transmitter (22,23,24) that is connected in series to described array in drain electrode of each modulator (26) or the source electrode, thus form the transmitter-modulator that comprises two end points (31,32); Selecting arrangement (8,14,15) can be selected transmitter capable (22); The holding capacitor of electric charge (29) can keep the control voltage at the grid place of described or each modulator (26) in described image persistence (T1, T2); Drive the luminous device (20A, 35,36,38,39,40,48) of transmitter (22,23) of row, comprise that at least one has the operational amplifier of inverting input (-), normal phase input end (+) and output terminal (35); This method comprises the following steps:
-transmit selection signal (V by selecting arrangement to transmitter (22) row Select);
-apply drive signal (I) by drive unit (20A, 35,36,38,39,40,48) in the end points (31,32) of each transmitter-modulator string of row (21A);
-apply control signal (V by drive unit (20A, 35,36,38,39,40,48) to the grid of each modulator (26) that is connected to selected transmitter (22) c),
It is characterized in that it also comprises the following steps:
-select transmitter capable, so that utilize the described modulator (26) of the output terminal be connected to described operational amplifier (35) grid, and utilize in the in-phase input end (+) of described operational amplifier (35) of described output terminal (42) of the electric supply installation (36,39,40) that is connected to these transmitters (22,23) and the inverting input (-) one, form the feedback loop of described operational amplifier (35).
16. method as claimed in claim 15 is characterized in that: drive signal (I) depends on the value (V of shows signal that is addressed to the whole group of transmitter (22,23) of described row (21A) in image persistence (T1, T2, T3, T4) Data22, V Data23) and.
CNB2005800328782A 2004-07-29 2005-07-29 Image display device and display device control method Expired - Fee Related CN100476937C (en)

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