CN102426816A - Method for repairing bad display of active-matrix organic light-emitting display - Google Patents

Abstract

The invention discloses a method for repairing bad display of an active-matrix organic light-emitting display, comprising the following steps of: (a) adding a touch screen and a Mura debugging box on the display; (b) touching abnormal areas on a display screen and sending the coordinate positions of the abnormal areas to a coordinate processing module in the Mura debugging box; forming all bad pixel areas; (c) burning different Gamma Look Up Tables into a Gamma register of a driving chip in sequence for each bad pixel area by a register burning module, and implementing different Gamma correction voltages to correct the grey-level brightness of the bad pixel areas; and (d) repeating the step (c) till the grey-level brightness of the pixel areas of the whole display is uniform. According to the method provided by the invention, the touch screen is used for dividing all the bad pixel areas, differentiated Gamma voltage correction is implemented for all abnormal areas, the cost of correction equipment is reduced and the debugging speed is improved.

Description

The bad restorative procedure of a kind of demonstration of active matrix/organic light emitting display

Technical field

The present invention relates to a kind of gray scale correction method of display, relate in particular to a kind of bad restorative procedure of demonstration of active matrix/organic light emitting display.

Background technology

Organic light emitting display (OLED) is the active illuminating device.Compare present main flow flat panel display Thin Film Transistor-LCD (TFT-LCD); OLED has high-contrast; Wide viewing angle, low-power consumption, advantage such as volume is thinner; Being expected to become the flat panel display of future generation after LCD, is one of the maximum technology that receives publicity in the present flat panel display.

To the LCD product; Set the Gamma curve that the TFT panel need be carried out; The Gamma curve: human eye is under relatively darker environment; Sensitivity to the brightness variation; Can will exceed much than the environment at light, the relation between sensation of people's brain (X) and the brightness (Y) is following:

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Be referred to as this relation " Gamma (gamma) curve " traditionally, A is a constant, but this is an approximate formula, and the Γ of brain is not a definite value, is about about 2.2 to 2.5.Afterwards, the corresponding relation of brightness and brain sensation just has been fixed up; And under the certain situation of back light source brightness, penetration can be directly proportional with brightness; And the relation of pixel voltage and penetration can change along with the difference of liquid crystal, so the corresponding relation of pixel voltage and video data, just need adjust along with employed liquid crystal.

AMOLED product and LCD are similar, and the corresponding relation of pixel voltage and video data also need adjust along with the characteristic of TFT and OLED.Video data to pass on, be the sensation of brain in fact, rather than brightness, so need do correction, make the direct ratio that is perceived by of video data and brain according to the Γ curve of brightness and brain sensation.

As shown in Figure 1, in the time of 0 GTG, corresponding data voltage is 0.6V, in the time of 80 GTGs; Corresponding data voltage is 1.3V, and during 127 GTGs, corresponding data voltage is 2.6V; During 170 GTGs, corresponding data voltage is 3.8V, and 255 GTG corresponding data voltages are 5V.Under the perfect condition,, whole front panel gets final product for providing a voltage-GTG mapping table.

But because the inhomogeneity of TFT and OLED characteristic causes under the same GTG and data voltage, the brightness of OLED is different, the panel of various zonal brightness disproportionations one occurs, i.e. the Mura phenomenon.Mura was a japanese character originally, but along with the LCD LCD of Japan is developed all over the world, and this word has also just become literal that the whole world can be general at display circle.Mura is meant the inhomogeneous phenomenon that causes various vestiges of display brightness; The simplest determination methods switches to black picture and other low grey menu exactly in the darkroom; Firmly go to see from various angle then; Along with processing procedure flaw miscellaneous, general LCD display all has Mura miscellaneous.Possibly be travers or 45 degree angle bead lines; Possibly be cut very straight square; Possibly be that certain corner occurs one; Possibly be that the colored rule that do not have fully can be sayed the vestige in one in west, east.To the Mura phenomenon; Comparatively general method is; Adopt multizone, many Gamma are technological, promptly each abnormal area in the every panel carried out the Gamma voltage correction of differentiation; Utilization than normal Gamma voltage (curve 0) slightly the voltage of high (curve 1) or lower slightly (curve 2) compensate the otherness of TFT and OLED, obtain the panel of brightness homogeneous.As shown in Figure 2.

Existing practical implementation way is following; Utilize CCD sensor that the bad panel of Mura is implemented to take pictures and analyze picture; Carry out image rectification then, perhaps after the correction data, feed back to data driving chip to correction data; Each abnormal area is carried out differentiation come out, describe like Fig. 3 FB(flow block).

Because comparatively loaded down with trivial details treatment scheme and the higher instrument cost of CCD sensor of above-mentioned implementing method needs the photographic analysis picture, and picture carried out image rectification, obtains correction data then, sends correction data to chip for driving.Observe its calibration result then.This flow process that circulates repeatedly, up to proofread and correct accomplish till.In order to reduce equipment cost and to reduce operating process, be necessary the gray scale correction method of existing LCD display is improved. ?

Summary of the invention

Technical matters to be solved by this invention provides a kind of bad restorative procedure of demonstration of active matrix/organic light emitting display, reduces the calibration equipment cost, reduces operating process, improves debugging speed.

The present invention solves the problems of the technologies described above the bad restorative procedure of demonstration that the technical scheme that adopts provides a kind of active matrix/organic light emitting display; Comprise the steps: that (a) increases touch-screen and Mura debugging box on display; Said Mura debugging box comprises register burning module and the coordinate processing module with read-write capability, and said debugging box connects the communication interface of display driver chip; (b) on display screen, touch abnormal area, send to the coordinate processing module in the Mura debugging box to the coordinate position of abnormal area; The coordinate processing module calculates the residing location of pixels of abnormal area, then this location of pixels is corresponded to the graph image storage unit, constitutes each bad pixel zone; (c) the register burning module, is implemented different gamma-corrected voltages and is corrected this bad pixel zone GTG brightness successively with the gamma register of the burned chip for driving of the corresponding look-up table of different gamma electric voltages-GTG each bad pixel zone; (d) repeating step c, the Real Time Observation calibration result is till the pixel region GTG brightness homogeneous of whole display.

The bad restorative procedure of the demonstration of above-mentioned active matrix/organic light emitting display, wherein, the size dimension of said touch-screen and display screen is roughly the same.

The present invention contrasts prior art has following beneficial effect: the bad restorative procedure of the demonstration of active matrix/organic light emitting display provided by the invention; Divide each bad pixel zone through utilizing touch-screen; And each abnormal area carried out the Gamma voltage correction of differentiation; Reduce the calibration equipment cost, reduce operating process, improve debugging speed. ?

Description of drawings

Fig. 1 is existing GTG and data voltage corresponding relation synoptic diagram;

Fig. 2 is existing many Gamma calibration curve synoptic diagram;

Fig. 3 is existing many Gamma corrective system treatment scheme synoptic diagram;

Fig. 4 is many Gamma of the present invention corrective system treatment scheme synoptic diagram;

Fig. 5 is many Gamma of the present invention corrective system Organization Chart;

The defective region coordinate border that Fig. 6 obtains touch-screen for coordinate processing module of the present invention is converted into the synoptic diagram of pixel region;

Fig. 7 supplies selectable some the Gamma curves of register cd-rom recorder for the present invention.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is done further description.

Fig. 4 is many Gamma of the present invention corrective system treatment scheme synoptic diagram; Fig. 5 is many Gamma of the present invention corrective system Organization Chart.

See also Fig. 4 and Fig. 5, the bad restorative procedure of the demonstration of active matrix/organic light emitting display provided by the invention comprises the steps:

(a) on display, increase touch-screen and Mura debugging box, said Mura debugging box comprises register burning module and the coordinate processing module with read-write capability; The register burning module can be selected the cd-rom recorder of present I2C or SPI interface for use, like AT45DB321D SPI FLASH, and S-24CS16A0I EEPROM, the coordinate processing module can be selected coordinate setting treating apparatus commonly used at present for use, details no longer one by one at this; Said debugging box connects the communication interface of display driver chip; The debugging box can link to each other with PC simultaneously and carry out parameter setting and graphic presentation;

(b) on display screen, touch abnormal area, send to the coordinate processing module in the Mura debugging box to the coordinate position of abnormal area; The coordinate processing module calculates the residing location of pixels of abnormal area, then this location of pixels is corresponded to the graph image storage unit, constitutes each bad pixel zone;

(c) the register burning module is regional according to each bad pixel that the coordinate processing module obtains; To each bad pixel zone; With the Gamma register of the burned chip for driving of the corresponding look-up table (Gamma look up table) of different gamma electric voltages-GTG, implement different gamma-corrected voltages and correct this bad pixel zone GTG brightness successively;

(d) repeating step c, the Real Time Observation calibration result is till the pixel region GTG brightness homogeneous of whole display.

The present invention utilizes touch screen technology; Set up graphic interface through on display screen, increasing touch-screen, through touching abnormal area, send to the residing location of pixels that coordinate processing module in the Mura debugging box calculates abnormal area to the coordinate position of abnormal area; Then this location of pixels is corresponded to GRAM (graph image storage unit); Constitute each defective region, implement different Gamma correction voltages, correct GTG brightness with this.

As shown in Figure 6, be example with the 12inch panel, the AA district is of a size of 289.87mm x 181mm (long x is wide); Pel array is 1280RGBx 800 (long x is wide); Each pixel region is 289.87mm/ (1280*3)=67um (length), 181mm/800=201um (wide), and promptly 67umx201um is the used zone of a sub-pixel regions; The defective region border that utilizes touch-screen to obtain can obtain defective region present position in GRAM (graph image storage unit).The corresponding look-up table number of gamma electric voltage-GTG is selected according to the different panels size; N is the display picture element line number, and is as shown in Figure 7, and extreme case can each pixel provide a LUT form; But required cost is higher; So in the actual debug process, the way of considered debugging cost compromise is carried out.It is all displays spare of background that gray scale correction method provided by the invention can be applied to the tft array.If LCD, that just can only have been regulated according to the characteristic of TFT, but if AMOLED, and the characteristic of that and TFT and OLED just all has and concerned, but the inhomogeneity of OLED is occurred frequently unlike the TFT that kind.

Though the present invention discloses as above with preferred embodiment; Right its is not that any those skilled in the art are not breaking away from the spirit and scope of the present invention in order to qualification the present invention; When can doing a little modification and perfect, so protection scope of the present invention is when being as the criterion with what claims defined.

Claims (2)

1. the bad restorative procedure of the demonstration of an active matrix/organic light emitting display is characterized in that, comprises the steps:

(a) on display, increase touch-screen and Mura debugging box, said Mura debugging box comprises register burning module and the coordinate processing module with read-write capability, and said debugging box connects the communication interface of display driver chip;

(b) on display screen, touch abnormal area, send to the coordinate processing module in the Mura debugging box to the coordinate position of abnormal area; The coordinate processing module calculates the residing location of pixels of abnormal area, then this location of pixels is corresponded to the graph image storage unit, constitutes each bad pixel zone;

(c) the register burning module, is implemented different gamma-corrected voltages and is corrected this bad pixel zone GTG brightness successively with the gamma register of the burned chip for driving of the corresponding look-up table of different gamma electric voltages-GTG each bad pixel zone;

(d) repeating step c, the Real Time Observation calibration result is till the pixel region GTG brightness homogeneous of whole display.

2. the bad restorative procedure of the demonstration of active matrix/organic light emitting display as claimed in claim 1 is characterized in that, the size dimension of said touch-screen and display screen is roughly the same.

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