CN102915719B - Device and method for preventing burning and color cast of liquid crystal panel - Google Patents
Device and method for preventing burning and color cast of liquid crystal panel Download PDFInfo
- Publication number
- CN102915719B CN102915719B CN201210445684.7A CN201210445684A CN102915719B CN 102915719 B CN102915719 B CN 102915719B CN 201210445684 A CN201210445684 A CN 201210445684A CN 102915719 B CN102915719 B CN 102915719B
- Authority
- CN
- China
- Prior art keywords
- pixel
- picture
- polar signal
- instantly
- image data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention relates to a device for preventing the burning and the color cast of a liquid crystal panel. The device comprises a memory unit, a lookup table, an analysis unit and a polarity reset unit, wherein the analysis unit is used for receiving image data of one current image, which is corresponding to a pixel; the image data of the current image is stored in the memory unit; according to the gray scale voltage of the image data of a previous image, which is corresponding to the pixel and the gray scale voltage of the image data of the current image, a first polarity signal of the current image, which is corresponding to the pixel, is generated; the polarity rest unit is used for generating a second polarity signal of the current image, which is corresponding to the pixel according to the first polarity signal and the second polarity signal of two previous second images, which are corresponding to the pixel, and the image data of the current image, which is corresponding to the pixel, and the second polarity signal are output to a source electrode driving circuit.
Description
Technical field
The invention relates to a kind of devices and methods therefor of liquid crystal panel, espespecially a kind of liquid crystal panel of avoiding burns the devices and methods therefor of paying with colour cast.
Background technology
Please refer to Fig. 1, Fig. 1 is the schematic diagram of the pixel 100 in explanation liquid crystal panel.As shown in Figure 1, pixel 100 comprises a switch 102, a storage capacitors CS and a liquid crystal capacitance CLC, and wherein switch 102 is to be coupled to a data line DL, one scan line SL, storage capacitors CS and liquid crystal capacitance CLC; Storage capacitors CS is coupled to a common electrode wire VCOMLINE, switch 102 and liquid crystal capacitance CLC; Liquid crystal capacitance CLC is coupled to switch 102 and storage capacitors CS, in order to receive a common voltage VCOMCF.As shown in Figure 1, because the confluce of data line DL and common electrode wire VCOMLINE forms a stray capacitance CSK, so when the voltage on data line DL switches because of change in polarity, can cause the voltage VCOM_CS on common electrode wire VCOMLINE to be affected.If for example, the change direction of all data line DL in liquid crystal panel identical (voltage is all and changes from small to big), voltage VCOM_CS is affected the most serious.
Please refer to Fig. 2, Fig. 2 is the voltage VCLC of enable signal VS, liquid crystal capacitance CLC on account for voltage VCOM_CS, sweep trace SL and the schematic diagram of the data voltage VDATA on data line DL.As shown in Figure 2, when switch 102 cuts out according to enable signal VS, if voltage VCOM_CS not yet returns back to an ideal value VCOM_DC of voltage VCOM_CS, can affect the voltage VCLC of liquid crystal capacitance CLC, the briliancy that causes pixel 100 to produce is influenced, further makes the shown picture of liquid crystal panel produce colour cast.Above-mentioned phenomenon is called the coupling effect of voltage VCOM_CS.
Please refer to Fig. 3 and Fig. 4, Fig. 3 is the schematic diagram of the common electric voltage compensator 300 that provides of explanation US20070002005 United States Patent (USP), and Fig. 4 is the schematic diagram of account for voltage VCOM_CS and bucking voltage VCOM_CSB.As shown in Figure 3, US20070002005 United States Patent (USP) is that all common electrode wire in liquid crystal panel are concatenated, and is connected to common electric voltage compensator 300.Then, common electric voltage compensator 300 can, according to resistance R 1 and R2 and a common reference voltage VCOMF, produce one and the anti-phase bucking voltage VCOM_CSB of voltage VCOM_CS, and input to all common electrode wire in liquid crystal panel.Therefore, US20070002005 United States Patent (USP) can be by the ratio (R2/R1) of adjusting resistance R1 and R2, makes the spoke that shakes identical (as shown in Figure 4) of voltage VCOM_CS and bucking voltage VCOM_CSB.So, US20070002005 United States Patent (USP) can be eliminated voltage VCOM_CS by the effect that change in voltage was coupled of data voltage VDATA.
Because US20070002005 United States Patent (USP) need be set the ratio (R2/R1) of resistance R 1 and R2 in advance, so if the FEOL of liquid crystal panel produces variation, or different process conditions, produce different coupled voltages, resistance R 1 need to be readjusted with the ratio (R2/R1) of R2.In addition, because need the back coupling cabling of design voltage VCOM_CS in liquid crystal panel, so the design of liquid crystal panel is more complicated, cause the cost of liquid crystal panel to increase.Therefore,, for the colour cast problem that solves liquid crystal panel, prior art is not a good selection.
Summary of the invention
One embodiment of the invention provide a kind of liquid crystal panel of avoiding to burn the device of paying with colour cast, and this liquid crystal panel comprises a plurality of pixels.This device comprises a mnemon, a look-up table, an analytic unit and a polarity reset cell.This look-up table is in order to store the gray scale voltage corresponding to a plurality of GTG values; This analytic unit is to be coupled to this mnemon and this look-up table, in order to receive the image data for picture instantly corresponding to a pixel, store this instantly the image data of picture to this mnemon, and according to the gray scale voltage of the image data of the last picture corresponding to this pixel and this gray scale voltage of the image data of picture instantly, produce one first polar signal corresponding to the picture instantly of this pixel; This polarity reset cell is to be coupled to this analytic unit, in order to according to the first polar signal corresponding to the picture instantly of this pixel with corresponding to the second polar signal of the first two picture of this pixel, generation is corresponding to one second polar signal of the picture instantly of this pixel, and output corresponding to the image data of the picture instantly of this pixel and this second polar signal to one source pole driving circuit.
Another embodiment of the present invention provides a kind of liquid crystal panel of avoiding to burn the method for paying with colour cast, wherein this liquid crystal panel comprises a plurality of pixels, one avoids liquid crystal panel to burn the device of paying with colour cast comprises a mnemon, a look-up table, an analytic unit and a polarity reset cell, and this look-up table stores the gray scale voltage corresponding to a plurality of GTG values.The method comprises this analytic unit and receives the image data for picture instantly corresponding to a pixel, and store this instantly the image data of picture to this mnemon; This analytic unit, according to the gray scale voltage of the image data of the last picture corresponding to this pixel and this gray scale voltage of the image data of picture instantly, produces one first polar signal corresponding to the picture instantly of this pixel; This polarity reset cell is according to the first polar signal of the picture instantly corresponding to this pixel with corresponding to the second polar signal of the first two picture of this pixel, and generation is corresponding to one second polar signal of the picture instantly of this pixel; The output of this polarity reset cell corresponding to the image data of the picture instantly of this pixel and this second polar signal to one source pole driving circuit.
The invention provides a kind of liquid crystal panel of avoiding and burn the devices and methods therefor of paying with colour cast.This device and the method are to utilize an analytic unit according to a gray scale voltage and of the image data corresponding to a last picture of a pixel gray scale voltage of the image data of picture instantly, generation is corresponding to this one first polar signal of picture instantly of this pixel, then utilize a polarity reset cell according to corresponding to this pixel this instantly picture the first polar signal and corresponding to the second polar signal of the first two picture of this pixel, produce and export one second polar signal corresponding to the picture instantly of this pixel to one source pole driving circuit.So, this source electrode drive circuit can be according to this image data of picture and this second polar signal instantly corresponding to this pixel, produce one first gray scale voltage to this pixel, and this pixel can show this image data of picture instantly according to this first gray scale voltage.Therefore, compared to prior art, the present invention not only can see through this analytic unit and avoid this pixel to produce now picture of colour cast, also can see through this polarity reset cell and avoid this pixel generation to burn the picture of paying in cash.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the pixel in explanation liquid crystal panel.
Fig. 2 is account for voltage, scan the schematic diagram of the voltage of online enable signal, liquid crystal capacitance and the data voltage of online data.
Fig. 3 is the schematic diagram of the common electric voltage compensator that provides of explanation US20070002005 United States Patent (USP).
Fig. 4 is the schematic diagram of account for voltage and bucking voltage.
To be that one embodiment of the invention explanations is a kind of avoid liquid crystal panel to burn paying and the schematic diagram of the device of colour cast Fig. 5.
Fig. 6 is the schematic diagram of explanation polarity reset cell.
Fig. 7 is that explanation is after liquid crystal panel start, corresponding to the schematic diagram of second polar signal of first picture of pixel and the polar relationship of the second polar signal of second picture.
Fig. 8 is that explanation is after liquid crystal panel start, corresponding to the schematic diagram of the polar relationship of the second polar signal, the second polar signal of a M-1 picture and second polar signal of M-2 picture of M picture of pixel.
To be that another embodiment of the present invention explanation is a kind of avoid liquid crystal panel to burn paying and the process flow diagram of the method for colour cast Fig. 9.
[primary clustering symbol description]
100 pixels
102 switches
300 common electric voltage compensators
500 devices
502 mnemons
504 look-up tables
506 analytic units
508 polarity reset cells
510 source electrode drive circuits
5082 the one D type flip-flops
5084 time delay open-circuits
5086 the 2nd D type flip-flops
5088 the 3rd D type flip-flops
5090 first phase inverters
5092 second phase inverters
5094 first with door
5096 mutual exclusions or door
5098 second with door
5100 or door
CS storage capacitors
CLK frequency
CLC liquid crystal capacitance
CSK stray capacitance
DL data line
ID, IDP image data
Original the first polar signal of OFP
PS1 (M), PS1 (1), PS1 (2) first polar signals
PS2 (M), PS2 (M-1), PS2 (M-2) the second polar signal
、PS2(1)、PS2(2)
R1, R2 resistance
SL sweep trace
The common reference voltage of VCOMF
VCOMLINE common electrode wire
VCOMCF common voltage
VCOM_CS, VCLC voltage
VS enable signal
VGP, VG gray scale voltage
VDATA data voltage
VCOM_DC ideal value
VCOM_CSB bucking voltage
+ positive polarity
-negative polarity
900-912 step.
Embodiment
Please refer to Fig. 5, to be that one embodiment of the invention explanations is a kind of avoid liquid crystal panel to burn paying and the schematic diagram of the device 500 of colour cast Fig. 5, and wherein liquid crystal panel comprises a plurality of pixels, and device 500 is to be contained in time schedule controller.As shown in Figure 5, device 500 comprises a mnemon 502, a look-up table 504, an analytic unit 506 and a polarity reset cell 508, and wherein look-up table 504 is for example, in order to store the gray scale voltage (look-up table 504 is in order to store the gray scale voltage corresponding to 256 GTG values) corresponding to a plurality of GTG values.As shown in Figure 5, analytic unit 506 is to be coupled to mnemon 502 and look-up table 504, in order to receive the image data ID for picture instantly corresponding to the pixel (P) in liquid crystal panel, and the image data ID that stores picture is instantly to mnemon 502, wherein the image data ID of picture has the original first polar signal OFP corresponding to pixel (P) instantly.In addition, analytic unit 506 is from reading in look-up table 504 corresponding to the gray scale voltage VGP of the image data IDP of a last picture of pixel (P) and the gray scale voltage VG of the image data ID of picture instantly, and wherein the image data IDP corresponding to the last picture of pixel (P) is stored in mnemon 502.Then, analytic unit 506, according to gray scale voltage VGP, gray scale voltage VG and formula (1), produces one first difference D1:
D1 = VGP – VG (1)
Analytic unit 506 is separately according to gray scale voltage VGP, the reversed polarity gray scale voltage of the image data ID of picture instantly
and formula (2), produce one second difference D2:
D2 = VGP –
(2)
When the second difference D2 is greater than the first difference D1, analytic unit 506 produces corresponding to the polarity of the original first polar signal OFP of one first polar signal PS1 (M) of the picture instantly of pixel (P) and picture instantly corresponding to pixel (P) identical; When the second difference D2 is less than the first difference D1, analytic unit 506 produces corresponding to the first polar signal PS1 (M) of the picture instantly of pixel (P) and contrary corresponding to the polarity of the original first polar signal OFP of the picture instantly of pixel (P).In addition, the first polar signal PS1 (M) corresponding to the picture instantly of pixel (P) can be a positive signal or a negative polarity signal.So, analytic unit 506 is the first polar signal PS1 (M) corresponding to the picture instantly of pixel (P) according to formula (1) and formula (2) generation, can avoid pixel (P) to produce colour cast and now look like.
As shown in Figure 5, polarity reset cell 508 is to be coupled to analytic unit 506, in order to according to the first polar signal PS1 (M) corresponding to the picture instantly of pixel (P) with corresponding to the second polar signal PS2 (M-1) and the PS2 (M-2) (by 508 generations of polarity reset cell) of the first two picture of pixel (P), generation is corresponding to one second polar signal PS2 (M) of the picture instantly of pixel (P), and output corresponding to the image data ID of the picture instantly of pixel (P) and the second polar signal PS2 (M) to one source pole driving circuit 510.
Please refer to Fig. 6, Fig. 6 is the schematic diagram of explanation polarity reset cell 508.As shown in Figure 6, polarity reset cell 508 comprise one the one D type flip-flop 5082, a time delay open-circuit 5084, one the 2nd D type flip-flop 5086, one the 3rd D type flip-flop 5088, one first phase inverter 5090, one second phase inverter 5092, one first with door 5094, one mutual exclusion or (exclusive OR) lock 5096, one second with door 5098 and one or door 5100.As shown in Figure 6, the one D type flip-flop 5082 has a first input end, in order to receive the first polar signal PS1 (M) corresponding to the picture instantly of pixel (P), one second input end, in order to receive a frequency CLK, and a positive output end, in order to according to frequency CLK, output is corresponding to the first polar signal PS1 (M) of the picture instantly of pixel (P); Time delay open-circuit 5084 is the positive output ends that are coupled to a D type flip-flop 5082, and wherein, in 2 frequency periods after liquid crystal panel start, time delay open-circuit 5084 is a short-circuit condition; The 2nd D type flip-flop 5086 has a first input end, one second input end, and in order to receive frequency CLK, and a positive output end, in order to according to frequency CLK, export the second polar signal PS2 (M-1) corresponding to the last picture of pixel (P); The 3rd D type flip-flop 5088 has a first input end, one second input end, and in order to receive frequency CLK, and a positive output end, in order to according to frequency CLK, export the second polar signal PS2 (M-2) corresponding to the first two picture of pixel (P); The first phase inverter 5090 has an input end, is coupled to the positive output end of the 3rd D type flip-flop 5088, in order to receive the second polar signal PS2 (M-2) corresponding to the first two picture of pixel (P), and an output terminal; The second phase inverter 5092 has an input end, is coupled to the positive output end of the 2nd D type flip-flop 5086, in order to receive the second polar signal PS2 (M-1) corresponding to the last picture of pixel (P), and an output terminal; First 5094 has a first input end with door, is coupled to the output terminal of the first phase inverter 5090, and one second input end is coupled to the output terminal of the second phase inverter 5092 and an output terminal; Mutual exclusion or door 5096 have a first input end, are coupled to the positive output end of the 3rd D type flip-flop 5088, and one second input end is coupled to the positive output end of the 2nd D type flip-flop 5086 and an output terminal; Second has a first input end with door 5098, be coupled to mutual exclusion or door 5096 output terminal, one second input end, is coupled to the first input end of a D type flip-flop 5082, in order to receive the first polar signal PS1 (M) corresponding to the picture instantly of pixel (P), and an output terminal; Or door 5100 has a first input end, be coupled to first with door 5094 output terminal, one second input end, be coupled to second with the output terminal of door 5098, and an output terminal, the second polar signal PS2 (M) in order to output corresponding to the picture instantly of pixel (P).
Please refer to Fig. 7 and Fig. 8, Fig. 7 is that explanation is after liquid crystal panel start, schematic diagram corresponding to the second polar signal PS2 (1) of first picture of pixel (P) and the polar relationship of the second polar signal PS2 (2) of second picture, to illustrate after liquid crystal panel start with Fig. 8, corresponding to the second polar signal PS2 (M), the second polar signal PS2 (M-1) of a M-1 picture of M picture of pixel (P) and the schematic diagram of the polar relationship of the second polar signal PS2 (M-2) of M-2 picture, wherein M≤3.As shown in Figure 6 and Figure 7,2 frequency periods after liquid crystal panel start, because it can be short-circuit condition for polarity information and the time delay open-circuit 5084 of first picture corresponding to pixel (P) and second picture judgement that polarity reset cell 508 does not have, so the polarity of the first polar signal PS1 (1) of first picture corresponding to pixel (P) that the polarity of the second polar signal PS2 (1) of first picture corresponding to pixel (P) that polarity reset cell 508 produces produces with analytic unit 506 is identical; The polarity of the first polar signal PS1 (2) of second picture corresponding to pixel (P) that the polarity of the second polar signal PS2 (2) of second picture corresponding to pixel (P) that polarity reset cell 508 produces produces with analytic unit 506 is identical.For example, when the polarity of the first polar signal PS1 (1) of first picture corresponding to pixel (P) is positive polarity (+), corresponding to the polarity of the second polar signal PS2 (1) of first picture of pixel (P), be also positive polarity (+); When the polarity of the first polar signal PS1 (1) of first picture corresponding to pixel (P) is negative polarity (-), corresponding to the polarity of the second polar signal PS2 (1) of first picture of pixel (P), be also negative polarity (-); When the polarity of the first polar signal PS1 (2) of second picture corresponding to pixel (P) is positive polarity (+), corresponding to the polarity of the second polar signal PS2 (2) of second picture of pixel (P), be also positive polarity (+); When the polarity of the first polar signal PS1 (2) of second picture corresponding to pixel (P) is negative polarity (-), corresponding to the polarity of the second polar signal PS2 (2) of second picture of pixel (P), be also negative polarity (-).
As shown in Figure 6 and Figure 8, after liquid crystal panel start, the 3rd picture and picture afterwards corresponding to pixel (P), because it can be an open-circuit condition for polarity information and the time delay open-circuit 5084 of the 3rd picture corresponding to pixel (P) and the judgement of picture afterwards that polarity reset cell 508 has, so the polarity corresponding to the second polar signal PS2 (M) of M picture of pixel (P) can be according to the polarity of the second polar signal PS2 (M-1) of M-1 picture, the polarity of the second polar signal PS2 (M-2) of M-2 picture, polarity and formula (3) corresponding to the first polar signal PS1 (M) of M picture of pixel (P) produce:
(3)
Therefore, as shown in Figure 8, when the polarity of the second polar signal PS2 (M-2) of M-2 the picture corresponding to pixel (P) is negative polarity (-), corresponding to the polarity of the second polar signal PS2 (M-1) of M-1 picture of pixel (P), it is negative polarity (-) and while being negative polarity (-) corresponding to the polarity of the first polar signal PS1 (M) of M picture of pixel (P), polarity reset cell 508 will be according to the polarity of the second polar signal PS2 (M-2), the polarity of the polarity of the second polar signal PS2 (M-1) and the first polar signal PS1 (M), generation has the second polar signal PS2 (M) of M the picture corresponding to pixel (P) of positive polarity (+), when the polarity of the second polar signal PS2 (M-2) of M-2 the picture corresponding to pixel (P) is negative polarity (-), corresponding to the polarity of the second polar signal PS2 (M-1) of M-1 picture of pixel (P), it is negative polarity (-) and while being positive polarity (+) corresponding to the polarity of the first polar signal PS1 (M) of M picture of pixel (P), polarity reset cell 508 will be according to the polarity of the second polar signal PS2 (M-2), the polarity of the polarity of the second polar signal PS2 (M-1) and the first polar signal PS1 (M), generation has the second polar signal PS2 (M) of M the picture corresponding to pixel (P) of positive polarity (+).Therefore, as shown in Figure 8, polarity reset cell 508 will can not make corresponding to the polarity of continuous three pictures of pixel (P) identical.That is polarity reset cell 508 can avoid pixel (P) to produce the existing picture of burning pair (sticking).
Polarity reset cell 508 output for example, corresponding to the image data ID of the picture instantly of pixel (P) and the second polar signal (the second polar signal PS2 (M)) to source electrode drive circuit 510, source electrode drive circuit 510 can be according to the image data ID of the picture instantly corresponding to pixel (P) and the second polar signal, produce one first gray scale voltage to pixel (P), and pixel (P) shows the image data ID of picture instantly according to the first gray scale voltage.
Please refer to Fig. 5 to Fig. 9, to be that another embodiment of the present invention explanation is a kind of avoid liquid crystal panel to burn paying and the process flow diagram of the method for colour cast Fig. 9.The method of Fig. 9 is to utilize the device 500 of Fig. 5 and 508 explanations of the polarity reset cell of Fig. 6, and detailed step is as follows:
Step 900: start;
Step 902: analytic unit 506 receives the image data ID for picture instantly corresponding to a pixel (P), and the image data ID that stores picture is instantly to mnemon 502;
Step 904: analytic unit 506 is according to the gray scale voltage VGP of the image data IDP of the last picture corresponding to pixel (P) and the gray scale voltage VG of the image data ID of picture instantly, and generation is corresponding to one first polar signal PS1 (M) of the picture instantly of pixel (P);
Step 906: polarity reset cell 508 is according to the first polar signal PS1 (M) of the picture instantly corresponding to pixel (P) with corresponding to the second polar signal PS2 (M-1) and the PS2 (M-2) of the first two picture of pixel (P), and generation is corresponding to one second polar signal PS2 (M) of the picture instantly of pixel (P);
Step 908: polarity reset cell 508 output corresponding to the image data ID of the picture instantly of pixel (P) and the second polar signal PS2 (M) to source electrode drive circuit 510; Carry out step 910 and step 902;
Step 910: source electrode drive circuit 510, according to image data ID and the second polar signal PS2 (M) of the picture instantly corresponding to pixel (P), produces one first gray scale voltage to pixel (P);
Step 912: pixel (P) shows the image data ID of picture instantly according to the first gray scale voltage.
In step 902, as shown in Figure 5, the image data ID that analytic unit 506 receives corresponding to the picture instantly of the pixel in liquid crystal panel (P), and the image data ID that stores picture is instantly to mnemon 502, wherein the image data ID of picture has an original first polar signal OFP of respective pixel (P) instantly.In addition, analytic unit 506 is from reading in look-up table 504 corresponding to the gray scale voltage VGP of the image data IDP of the last picture of pixel (P) and the gray scale voltage VG of the image data ID of picture instantly, and wherein the image data IDP corresponding to the last picture of pixel (P) is stored in mnemon 502.In step 904, analytic unit 506, first according to gray scale voltage VGP, gray scale voltage VG and formula (1), produces one first difference D1, then according to gray scale voltage VGP, a reversed polarity gray scale voltage of the image data ID of picture instantly
and formula (2), produce one second difference D2.Then, when the second difference D2 is greater than the first difference D1, analytic unit 506 produces corresponding to the polarity of the original first polar signal OFP of the first polar signal PS1 (M) of the picture instantly of pixel (P) and picture instantly corresponding to pixel (P) identical; When the second difference D2 is less than the first difference D1, analytic unit 506 produces corresponding to the first polar signal PS1 (M) of the picture instantly of pixel (P) and contrary corresponding to the polarity of the original first polar signal OFP of the picture instantly of pixel (P).In addition, the first polar signal PS1 (M) corresponding to the picture instantly of pixel (P) can be a positive signal or a negative polarity signal.
In step 906, as shown in Figure 5 and Figure 6,2 frequency periods after liquid crystal panel start, because it can be short-circuit condition for polarity information and the time delay open-circuit 5084 of first picture corresponding to pixel (P) and second picture judgement that polarity reset cell 508 does not have, so the polarity of the first polar signal PS1 (1) of first picture corresponding to pixel (P) that the polarity of the second polar signal PS2 (1) of first picture corresponding to pixel (P) that polarity reset cell 508 produces produces with analytic unit 506 is identical; The polarity of the first polar signal PS1 (2) of second picture corresponding to pixel (P) that the polarity of the second polar signal PS2 (2) of second picture corresponding to pixel (P) that polarity reset cell 508 produces produces with analytic unit 506 is identical.For example, as shown in Figure 7, when the polarity of the first polar signal PS1 (1) of first picture corresponding to pixel (P) is positive polarity (+), corresponding to the polarity of the second polar signal PS2 (1) of first picture of pixel (P), be also positive polarity (+); When the polarity of the first polar signal PS1 (1) of first picture corresponding to pixel (P) is negative polarity (-), corresponding to the polarity of the second polar signal PS2 (1) of first picture of pixel (P), be also negative polarity (-); When the polarity of the first polar signal PS1 (2) of second picture corresponding to pixel (P) is positive polarity (+), corresponding to the polarity of the second polar signal PS2 (2) of second picture of pixel (P), be also positive polarity (+); When the polarity of the first polar signal PS1 (2) of second picture corresponding to pixel (P) is negative polarity (-), corresponding to the polarity of the second polar signal PS2 (2) of second picture of pixel (P), be also negative polarity (-).
In step 906, as Fig. 5, shown in Fig. 6 and Fig. 8, after liquid crystal panel start, the 3rd picture and picture afterwards corresponding to pixel (P), because it can be an open-circuit condition for polarity information and the time delay open-circuit 5084 of the 3rd picture corresponding to pixel (P) and the judgement of picture afterwards that polarity reset cell 508 has, so polarity reset cell 508 can be according to the polarity of the second polar signal PS2 (M-1) of M-1 picture, the polarity of the second polar signal PS2 (M-2) of M-2 picture, polarity and formula (3) corresponding to the first polar signal PS1 (M) of M picture of pixel (P), generation is corresponding to the polarity of the second polar signal PS2 (M) of M picture of pixel (P).Therefore, as shown in Figure 8, when the polarity of the second polar signal PS2 (M-2) of M-2 the picture corresponding to pixel (P) is negative polarity (-), corresponding to the polarity of the second polar signal PS2 (M-1) of M-1 picture of pixel (P), it is negative polarity (-) and while being negative polarity (-) corresponding to the polarity of the first polar signal PS1 (M) of M picture of pixel (P), polarity reset cell 508 will be according to the polarity of the second polar signal PS2 (M-2), the polarity of the polarity of the second polar signal PS2 (M-1) and the first polar signal PS1 (M), generation has the second polar signal PS2 (M) of M the picture corresponding to pixel (P) of positive polarity (+), when the polarity of the second polar signal PS2 (M-2) of M-2 the picture corresponding to pixel (P) is negative polarity (-), corresponding to the polarity of the second polar signal PS2 (M-1) of M-1 picture of pixel (P), it is negative polarity (-) and while being positive polarity (+) corresponding to the polarity of the first polar signal PS1 (M) of M picture of pixel (P), polarity reset cell 508 will be according to the polarity of the second polar signal PS2 (M-2), the polarity of the polarity of the second polar signal PS2 (M-1) and the first polar signal PS1 (M), generation has the second polar signal PS2 (M) of M the picture corresponding to pixel (P) of positive polarity (+).Therefore, as shown in Figure 8, polarity reset cell 508 will can not make corresponding to the polarity of continuous three pictures of pixel (P) identical.That is polarity reset cell 508 can avoid pixel (P) to produce burning cash payment picture.
In step 908, as shown in Figure 5, at polarity reset cell 508, produce after the second polar signal PS2 (M) corresponding to the picture instantly of pixel (P), 508 outputs of polarity reset cell corresponding to the image data ID of the picture instantly of pixel (P) and the second polar signal PS2 (M) to source electrode drive circuit 510.After step 908, this method can be proceeded step 910 and again carry out step 902 to step 908, wherein, in step 902, analytic unit 506 is the image datas that receive corresponding to next picture of pixel (P), and the image data that stores next picture is to mnemon 502.And in step 910, polarity reset cell 508 output corresponding to the image data ID of the picture instantly of pixel (P) and the second polar signal PS2 (M) to source electrode drive circuit 510, source electrode drive circuit 510 can, according to the image data ID of the picture instantly corresponding to pixel (P) and the second polar signal PS2 (M), produce the first gray scale voltage to pixel (P).In step 912, pixel (P) can show the image data ID of picture instantly according to the first gray scale voltage.
In sum, provided by the present inventionly avoid liquid crystal panel burn to pay and the devices and methods therefor of colour cast is to utilize analytic unit according to the gray scale voltage of the image data of the last picture corresponding to a pixel and the gray scale voltage of the image data of picture instantly, generation is corresponding to one first polar signal of the picture instantly of pixel, then utilize polarity reset cell according to the first polar signal corresponding to the picture instantly of pixel with corresponding to the second polar signal of the first two picture of pixel, produce and export one second polar signal corresponding to the picture instantly of pixel to source electrode drive circuit.So, source electrode drive circuit can, according to the image data of the picture instantly corresponding to pixel and the second polar signal, produce one first gray scale voltage to pixel, and pixel can show the image data of picture instantly according to the first gray scale voltage.Therefore, compared to prior art, the present invention not only can see through analytic unit and avoid pixel to produce now picture of colour cast, also can see through polarity reset cell and avoid pixel generation to burn the picture of paying in cash.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (9)
1. avoid liquid crystal panel to burn a device of paying with colour cast, this liquid crystal panel comprises a plurality of pixels, it is characterized in that, this device comprises:
One mnemon;
One look-up table, in order to store the gray scale voltage corresponding to a plurality of GTG values;
One analytic unit, be coupled to this mnemon and this look-up table, in order to receive the image data for picture instantly corresponding to a pixel, store this instantly the image data of picture to this mnemon, and according to the gray scale voltage of the image data of the last picture corresponding to this pixel and this gray scale voltage of the image data of picture instantly, produce one first polar signal corresponding to the picture instantly of this pixel; And
One polarity reset cell, be coupled to this analytic unit, in order to according to the first polar signal corresponding to the picture instantly of this pixel with corresponding to the second polar signal of the first two picture of this pixel, generation is corresponding to one second polar signal of the picture instantly of this pixel, and output corresponding to the image data of the picture instantly of this pixel and this second polar signal to one source pole driving circuit; Wherein this analytic unit is according to the gray scale voltage of the image data of the last picture corresponding to this pixel and this gray scale voltage of the image data of picture instantly, and the first polar signal producing corresponding to the picture instantly of this pixel comprises:
This analytic unit, according to the gray scale voltage of the image data of the last picture corresponding to this pixel and this gray scale voltage of the image data of picture instantly, produces one first difference;
This analytic unit, according to the gray scale voltage of the image data of the last picture corresponding to this pixel and this reversed polarity gray scale voltage of the image data of picture instantly, produces one second difference; And
When this second difference is greater than this first difference, this analytic unit produces corresponding to the polarity of original first polar signal of the first polar signal of the picture instantly of this pixel and picture instantly corresponding to this pixel identical; When this second difference is less than this first difference, this analytic unit produces corresponding to the first polar signal of the picture instantly of this pixel and contrary corresponding to the polarity of original first polar signal of the picture instantly of this pixel.
2. the liquid crystal panel of avoiding as claimed in claim 1 burns the device of paying with colour cast, it is characterized in that: wherein this source electrode drive circuit is according to the image data of the picture instantly corresponding to this pixel and this second polar signal, produce one first gray scale voltage to this pixel, and this pixel shows this image data of picture instantly according to this first gray scale voltage.
3. the liquid crystal panel of avoiding as claimed in claim 1 burns the device of paying with colour cast, it is characterized in that: wherein this polarity reset cell comprises:
One the one D type flip-flop, has a first input end, in order to receive the first polar signal corresponding to the picture instantly of this pixel, one second input end, in order to receive a frequency, and a positive output end, in order to according to this frequency, export the first polar signal corresponding to the picture instantly of this pixel;
One time delay open-circuit, is coupled to this positive output end of a D type flip-flop, 2 frequency periods after this liquid crystal panel start wherein, and this time delay open-circuit is a short-circuit condition;
One the 2nd D type flip-flop, has a first input end, one second input end, and in order to receive this frequency, and a positive output end, in order to according to this frequency, export the second polar signal corresponding to the last picture of this pixel;
One the 3rd D type flip-flop, has a first input end, one second input end, and in order to receive this frequency, and a positive output end, in order to according to this frequency, export the second polar signal corresponding to the first two picture of this pixel;
One first phase inverter, has an input end, is coupled to this positive output end of the 3rd D type flip-flop, in order to receive the second polar signal corresponding to the first two picture of this pixel, and an output terminal;
One second phase inverter, has an input end, is coupled to this positive output end of the 2nd D type flip-flop, in order to receive the second polar signal corresponding to the last picture of this pixel, and an output terminal;
One first with door, there is a first input end, be coupled to this output terminal of this first phase inverter, one second input end, is coupled to this output terminal of this second phase inverter and an output terminal;
One mutual exclusion or (exclusive OR) lock, have a first input end, is coupled to this positive output end of the 3rd D type flip-flop, and one second input end is coupled to this positive output end of the 2nd D type flip-flop and an output terminal;
One second with door, there is a first input end, be coupled to this mutual exclusion or door this output terminal, one second input end, be coupled to this first input end of a D type flip-flop, in order to receive the first polar signal corresponding to the picture instantly of this pixel, and an output terminal; And
One or door, there is a first input end, be coupled to this first with this output terminal of door, one second input end, be coupled to this second with this output terminal of door, an and output terminal, the second polar signal in order to output corresponding to the picture instantly of this pixel.
4. the liquid crystal panel of avoiding as claimed in claim 1 burn to be paid and the device of colour cast, it is characterized in that: wherein the first polar signal corresponding to the picture instantly of this pixel is a positive signal.
5. the liquid crystal panel of avoiding as claimed in claim 1 burn to be paid and the device of colour cast, it is characterized in that: wherein the first polar signal corresponding to the picture instantly of this pixel is a negative polarity signal.
6. avoid liquid crystal panel to burn the method for paying with colour cast for one kind, wherein this liquid crystal panel comprises a plurality of pixels, one avoids liquid crystal panel to burn the device of paying with colour cast comprises a mnemon, a look-up table, an analytic unit and a polarity reset cell, and this look-up table stores the gray scale voltage corresponding to a plurality of GTG values, it is characterized in that, the method comprises:
This analytic unit receives the image data for picture instantly corresponding to a pixel, and store this instantly the image data of picture to this mnemon;
This analytic unit, according to the gray scale voltage of the image data of the last picture corresponding to this pixel and this gray scale voltage of the image data of picture instantly, produces one first polar signal corresponding to the picture instantly of this pixel;
This polarity reset cell is according to the first polar signal of the picture instantly corresponding to this pixel with corresponding to the second polar signal of the first two picture of this pixel, and generation is corresponding to one second polar signal of the picture instantly of this pixel; And
The output of this polarity reset cell corresponding to the image data of the picture instantly of this pixel and this second polar signal to one source pole driving circuit; Wherein this analytic unit is according to the gray scale voltage of the image data of the last picture corresponding to this pixel and this gray scale voltage of the image data of picture instantly, and the first polar signal producing corresponding to the picture instantly of this pixel comprises:
This analytic unit, according to the gray scale voltage of the image data of the last picture corresponding to this pixel and this gray scale voltage of the image data of picture instantly, produces one first difference;
This analytic unit, according to the gray scale voltage of the image data of the last picture corresponding to this pixel and this reversed polarity gray scale voltage of the image data of picture instantly, produces one second difference; And
When this second difference is greater than this first difference, this analytic unit produces corresponding to the polarity of original first polar signal of the first polar signal of the picture instantly of this pixel and picture instantly corresponding to this pixel identical; When this second difference is less than this first difference, this analytic unit produces corresponding to the first polar signal of the picture instantly of this pixel and contrary corresponding to the polarity of original first polar signal of the picture instantly of this pixel.
7. the liquid crystal panel of avoiding as claimed in claim 6 burns the method for paying with colour cast, it is characterized in that, separately comprises:
This source electrode drive circuit, according to the image data of the picture instantly corresponding to this pixel and this second polar signal, produces one first gray scale voltage to this pixel; And
This pixel shows this image data of picture instantly according to this first gray scale voltage.
8. the liquid crystal panel of avoiding as claimed in claim 6 burn to be paid and the method for colour cast, it is characterized in that: wherein the first polar signal corresponding to the picture instantly of this pixel is a positive signal.
9. the liquid crystal panel of avoiding as claimed in claim 6 burn to be paid and the method for colour cast, it is characterized in that: wherein the first polar signal corresponding to the picture instantly of this pixel is a negative polarity signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210445684.7A CN102915719B (en) | 2012-11-09 | 2012-11-09 | Device and method for preventing burning and color cast of liquid crystal panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210445684.7A CN102915719B (en) | 2012-11-09 | 2012-11-09 | Device and method for preventing burning and color cast of liquid crystal panel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102915719A CN102915719A (en) | 2013-02-06 |
| CN102915719B true CN102915719B (en) | 2014-09-17 |
Family
ID=47614059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210445684.7A Expired - Fee Related CN102915719B (en) | 2012-11-09 | 2012-11-09 | Device and method for preventing burning and color cast of liquid crystal panel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102915719B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6572095B2 (en) * | 2015-10-28 | 2019-09-04 | 株式会社ジャパンディスプレイ | Display device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101017650A (en) * | 2006-02-09 | 2007-08-15 | Lg.菲利浦Lcd株式会社 | Apparatus and method for driving liquid crystal display device |
| CN101303491A (en) * | 2007-05-11 | 2008-11-12 | 群康科技(深圳)有限公司 | Liquid crystal display apparatus and drive method thereof |
| CN101329843A (en) * | 2007-06-22 | 2008-12-24 | 群康科技(深圳)有限公司 | Liquid crystal display device and driving method thereof |
| CN102542980A (en) * | 2010-12-22 | 2012-07-04 | 乐金显示有限公司 | Timing controller and organic light emitting diode display device using the same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006126475A (en) * | 2004-10-28 | 2006-05-18 | Nec Electronics Corp | Liquid crystal display and driving method of the liquid crystal display |
-
2012
- 2012-11-09 CN CN201210445684.7A patent/CN102915719B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101017650A (en) * | 2006-02-09 | 2007-08-15 | Lg.菲利浦Lcd株式会社 | Apparatus and method for driving liquid crystal display device |
| CN101303491A (en) * | 2007-05-11 | 2008-11-12 | 群康科技(深圳)有限公司 | Liquid crystal display apparatus and drive method thereof |
| CN101329843A (en) * | 2007-06-22 | 2008-12-24 | 群康科技(深圳)有限公司 | Liquid crystal display device and driving method thereof |
| CN102542980A (en) * | 2010-12-22 | 2012-07-04 | 乐金显示有限公司 | Timing controller and organic light emitting diode display device using the same |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2006-126475A 2006.05.18 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102915719A (en) | 2013-02-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109509415B (en) | Display device comprising a level shifter | |
| CN102129845B (en) | Liquid crystal panel driving circuit and liquid crystal display device | |
| TWI518652B (en) | Electro-phoretic display apparatus | |
| CN100468510C (en) | Display device and driving device | |
| CN101645244B (en) | Liquid crystal display device and driving method thereof | |
| US8159484B2 (en) | Liquid crystal device, pixel circuit, active matrix substrate, and electronic apparatus | |
| CN103278948B (en) | The method detected for the line badness of display panel and pick-up unit | |
| CN104731399A (en) | Display device with integrated touch screen and driving method thereof | |
| US11238768B2 (en) | Pixel circuit and driving method thereof, display substrate, and display device | |
| KR102031685B1 (en) | Liquid Crystal Display and Driving Method thereof | |
| CN101770104A (en) | Liquid crystal display device | |
| CN104299652A (en) | Shifting register and driving method thereof as well as grid electrode driving circuit and display device | |
| CN105654890A (en) | Display device and driving method thereof | |
| CN105096784A (en) | Detection circuit and detection method, display panel and control method and display device | |
| CN103680447A (en) | Liquid crystal display device and pixel driving method thereof | |
| CN102324224B (en) | Liquid crystal display and driving method thereof | |
| CN106601207A (en) | Control circuit, source control circuit, driving method, and display device | |
| CN102915719B (en) | Device and method for preventing burning and color cast of liquid crystal panel | |
| CN103268748B (en) | A kind of voltage control method of electrode and device | |
| CN104217669B (en) | A kind of gate driver circuit and driving method, display device | |
| Lin et al. | Novel dual-coupling pixel circuit to achieve high transmittance of blue-phase liquid crystal | |
| CN101989001B (en) | Common voltage generating circuit of liquid crystal display | |
| CN104409035B (en) | Pixel circuit and driving method thereof | |
| US9165507B2 (en) | Lighting system having interlaced driving mechanism | |
| CN103280204B (en) | The driving method of liquid crystal display |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140917 Termination date: 20191109 |