CN102097061A - Method for driving electrophoretic display and measuring feed-through voltages - Google Patents
Method for driving electrophoretic display and measuring feed-through voltages Download PDFInfo
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- CN102097061A CN102097061A CN2011100445393A CN201110044539A CN102097061A CN 102097061 A CN102097061 A CN 102097061A CN 2011100445393 A CN2011100445393 A CN 2011100445393A CN 201110044539 A CN201110044539 A CN 201110044539A CN 102097061 A CN102097061 A CN 102097061A
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Abstract
The invention provides a method for driving an electrophoretic display and measuring feed-through voltages, which comprises the following steps: dividing a plurality of pixels of a display panel of the electrophoretic display into a plurality of blocks; setting a common voltage of the display panel to be a first voltage; sequentially inputting a plurality of scanning signals into a plurality of scanning lines of the display panel, wherein the scanning lines corresponding to the same block receive the same scanning signal; measuring a plurality of data lines of the display panel so as to obtain at least one peak voltage corresponding to each block; determining the feed-through voltage corresponding to each block according to the peak voltages respectively corresponding to the blocks; and regulating a plurality of driving signals for driving each block according to the feed-through voltage corresponding to each block.
Description
Technical field
The invention relates to a kind of driving method and voltage method for measurement, and particularly relevant for a kind of driving method of electrophoretic display device (EPD) and the method for measurement of feed-trough voltage.
Background technology
(Electrophoresis Display EPD) has the characteristic of light, thin, deflection and power saving, and meets the environmental protection subject under discussion that is expanded at present electrophoresis type display, therefore becomes the display technique of order that receives much concern.The type of drive of electrophoresis type display is to utilize extra electric field to change the position of charged particle, between charged particle and electrophoresis solution, charged particle and backboard or between charged particle then the degree of reflection of transmitted light present color contrast, capable of displaying image in view of the above, and because of must not reducing the thickness of display with module backlight.And when not applying extra electric field, charged particle can be maintained at position originally, and electrophoresis type display can continue to show and can reach purpose of power saving with this by picture originally.
In order to improve the resolution of electrophoretic display device (EPD), can adopt usually thin film transistor (TFT) (thin film transistor, TFT) substrate make active electrophoretic display (Active-Matrix Electrophoretic Display, AMEPD).Gate drivers in regular turn the output scanning signal to the multi-strip scanning line of display panel, to open each row pixel by row, the input drive signal that data line is then corresponding, drive charged particle by this and change its position, wherein charged particle drives for seeing through the interelectrode together electric field of pixel electrode.With thin film transistor base plate, when the pixel of display panel is opened by row, the drain voltage of the thin film transistor (TFT) of each pixel (voltage that is equal to pixel electrode) can present instability, that is can have a voltage difference between the voltage of the voltage of the pixel electrode of pixel when opening and the pixel pixel electrode when closing, and this voltage difference mainly is because due to the stray capacitance between the grid of thin film transistor (TFT) and drain electrode, and this voltage difference is commonly referred to as feedthrough (feed-through) voltage.
According to above-mentioned, in the active electrophoretic display of making adopting thin film transistor base plate, can form stray capacitance equally between the grid of thin film transistor (TFT) and drain electrode in each pixel, cause the voltage of the pixel electrode of each pixel to close feed-trough voltage of back decline in pixel.Because electrophoretic display device (EPD) is to see through the interelectrode together electric field of pixel electrode (that is the interelectrode together voltage difference of pixel electrode) to drive charged particle, and the decline of the voltage of pixel electrode can influence the whole degree of moving of charged particle, so that can influence the picture grade.
In addition, because LCD can adopt thin film transistor base plate to make equally, so LCD has the problem of feed-trough voltage equally.Because liquid crystal is stopping can to automatically return to initial state after the driving, so LCD can be found out feed-trough voltage through the degree of film flicker.But because the state of the charged particle in the electrophoresis solution can be maintained at driving after stopping to drive after, the degree that therefore can't see through film flicker be found out feed-trough voltage.
Summary of the invention
The invention provides a kind of method for measurement of feed-trough voltage of electrophoretic display device (EPD), it is the sweep trace of sweep signal input display panel, and the feed-trough voltage of each the block correspondence of crest voltage decision display panel that is measured by data line.
The invention provides a kind of driving method of electrophoretic display device (EPD), its feed-trough voltage according to each block correspondence is adjusted the waveform of the drive signal of each block correspondence, so that feed-trough voltage is compensated.
The present invention proposes a kind of driving method of electrophoretic display device (EPD), and it comprises the following steps.A plurality of pixels of the display panel of electrophoretic display device (EPD) are divided into a plurality of blocks.The common voltage of display panel is set at first voltage.With a plurality of sweep signals multi-strip scanning line of input display panel in regular turn, wherein the sweep trace of corresponding same block receives same sweep signal.Measure many data lines of display panel, to obtain at least one crest voltage of corresponding each block.Determine the feed-trough voltage of each block correspondence according to the corresponding respectively described crest voltage of these blocks.Adjust a plurality of drive signals of each block correspondence according to the feed-trough voltage of each block correspondence.Each block drives according to adjusted these drive signals accordingly.
In one embodiment of this invention, the step that the above-mentioned feed-trough voltage according to each block correspondence is adjusted a plurality of drive signals of each block correspondence comprises: form the compensation pulse wave on each drive signal, the pulse bandwidth that wherein compensates pulse wave is proportional to feed-trough voltage.
In one embodiment of this invention, the above-mentioned compensation pulse wave data that are formed at each drive signal write before the pulse wave.
In one embodiment of this invention, the above-mentioned compensation pulse wave data that are formed at each drive signal write after the pulse wave.
In one embodiment of this invention, the step that the above-mentioned feed-trough voltage according to each block correspondence is adjusted a plurality of drive signals of each block correspondence comprises: the voltage quasi position of these drive signals of displacement, wherein the voltage quasi position displacement of these drive signals equals feed-trough voltage.
In one embodiment of this invention, the feed-trough voltage of each above-mentioned block correspondence is the mean value of the described crest voltage of corresponding each block.
In one embodiment of this invention, the feed-trough voltage of each above-mentioned block correspondence is the mean value of the described crest voltage of corresponding these blocks.
The present invention also proposes a kind of method for measurement of feed-trough voltage of electrophoretic display device (EPD), and it comprises the following steps.A plurality of pixels of the display panel of electrophoretic display device (EPD) are divided into a plurality of blocks.The common voltage of display panel is set at first voltage.With a plurality of sweep signals multi-strip scanning line of input display panel in regular turn, these sweep traces of corresponding same block receive same sweep signal.Measure many data lines of display panel, to obtain at least one crest voltage of corresponding each block.Determine the feed-trough voltage of each block correspondence according to the corresponding respectively described crest voltage of these blocks.
In one embodiment of this invention, these above-mentioned blocks comprise at least one pixel respectively.
In one embodiment of this invention, the first above-mentioned voltage is ground voltage.
Based on above-mentioned, the driving method of the electrophoretic display device (EPD) of the embodiment of the invention and the method for measurement of feed-trough voltage, it is display panel a plurality of blocks respectively, and the same sweep signal of the pixel basis in the same block and opening, and obtain the crest voltage of each block correspondence by the metric data line.Then, determine the feed-trough voltage of each block correspondence according to the crest voltage of these block correspondences, and driving method can be adjusted the waveform of the drive signal of each block correspondence again according to the feed-trough voltage of each block correspondence.By this, can measure the feed-trough voltage of each block correspondence, and adjust the waveform of the drive signal of each block correspondence in view of the above, so that feed-trough voltage is compensated.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and cooperate appended graphic being described in detail below.
Description of drawings
Fig. 1 is the block distribution schematic diagram according to the display panel of the electrophoretic display device (EPD) of one embodiment of the invention.
Fig. 2 is according to the waveform synoptic diagram of the voltage of the sweep signal of one embodiment of the invention and data line among Fig. 1.
Fig. 3 is the adjustment synoptic diagram according to the drive signal of the electrophoretic display device (EPD) of one embodiment of the invention.
Fig. 4 is the adjustment synoptic diagram according to the drive signal of the electrophoretic display device (EPD) of another embodiment of the present invention.
Fig. 5 is the adjustment synoptic diagram according to the drive signal of the electrophoretic display device (EPD) of yet another embodiment of the invention.
Fig. 6 is the process flow diagram according to the driving method of the electrophoretic display device (EPD) of one embodiment of the invention.
Embodiment
Fig. 1 is the block distribution schematic diagram according to the display panel of the electrophoretic display device (EPD) of one embodiment of the invention.Please refer to Fig. 1, in the present embodiment, display panel 100 comprises a plurality of pixel P, multi-strip scanning line (as SL1-SL4) and many data lines (as DL1-DL4).Each pixel P comprises a driving component (is example with the transistor T at this) and a display module DE at least, and display module DE comprises the assembly in order to show, for example charged particle, electrophoresis solution, pixel electrode and common electrode, the embodiment of the invention is not as limit.And, in the present embodiment, the common voltage Vcom that common electrode received at this for being coupled to earth point, also be about to common voltage Vcom and be set at ground voltage (i.e. first voltage), but in other embodiments, common voltage Vcom can be set at a direct current voltage, the present invention is not as limit.
In addition, a plurality of pixel P of display panel 100 can be divided into a plurality of blocks (as 101,103,105 and 107), to measure corresponding crest voltage at each block.In the present embodiment, be that pixel P with 2 * 2 arranged is defined as a block, but in other embodiments, a pixel P can be defined as a block, perhaps a plurality of pixel P with any arranged are defined as a block, that is a block can comprise at least one pixel P.And in order to measure the crest voltage of each block correspondence, the sweep trace of corresponding same block can receive same sweep signal, and for example sweep trace SL1 and SL2 can receive sweep signal SC1, and sweep trace SL3 and SL4 can receive sweep signal SC2.
Fig. 2 is according to the waveform synoptic diagram of the voltage of the sweep signal of one embodiment of the invention and data line among Fig. 1.Please refer to Fig. 1 and Fig. 2, in the present embodiment, for convenience of explanation, is example with block 101,103,105 and 107 then.According to above-mentioned, sweep signal SC1 can input to sweep trace SL1 and SL2 earlier, and then sweep signal SC2 can input to sweep trace SL3 and SL4, that is the formation pulse wave P1 of sweep signal SC1 meeting elder generation, and then sweep signal SC2 forms pulse wave P2.
When sweep signal SC1 formed pulse wave P1, the transistor T of each pixel P can be unlocked in the block 101 and 103.At this moment, in block 101 and 103, the equivalent capacity Cgd between the grid of transistor T and drain electrode can utilize pulse wave P1 to charge, and the source electrode of transistor T and drain electrode meeting conducting are so that the voltage of source electrode can be same as the voltage of drain electrode.Therefore, can measure the crest voltage V of the drain voltage of the transistor T that couples data line DL1 in the block 101 by data line DL1
11, can measure the crest voltage V of the drain electrode of the transistor T that couples data line DL2 in the block 101 by data line DL2
21, can measure the crest voltage V of the transistor T drain electrode that couples data line DL3 in the block 103 by data line DL3
31, and the crest voltage V that can measure the drain electrode of the transistor T that couples data line DL4 in the block 103 by data line DL4
41
When sweep signal SC2 formed pulse wave P2, the transistor T of each pixel P can be unlocked in the block 105 and 107.At this moment, in block 105 and 107, the equivalent capacity Cgd between the grid of transistor T and drain electrode can utilize pulse wave P2 to charge.And, can measure the crest voltage V of the drain electrode of the transistor T that couples data line DL1 in the block 105 by data line DL1
12, can measure the crest voltage V of the drain electrode of the transistor T that couples data line DL2 in the block 105 by data line DL2
22, can measure the crest voltage V of the drain electrode of the transistor T that couples data line DL3 in the block 107 by data line DL3
32, and the crest voltage V that can measure the drain electrode of the transistor T that couples data line DL4 in the block 107 by data line DL4
42
In different embodiment, different blocks can corresponding different feed-trough voltage, that is the corresponding different respectively feed-trough voltage of block 101,103,105 and 107.With block 101 is example, the feed-trough voltage Δ V that it is corresponding
101Can equal crest voltage V
11With crest voltage V
21Mean value.With block 103 is example, the feed-trough voltage Δ V that it is corresponding
103Can equal crest voltage V
31With crest voltage V
41Mean value.With block 105 is example, the feed-trough voltage Δ V that it is corresponding
105Can equal crest voltage V
12With crest voltage V
22Mean value.With block 107 is example, the feed-trough voltage Δ V that it is corresponding
107Can equal crest voltage V
32With crest voltage V
42Mean value.
Perhaps, each zone can correspond to same feed-trough voltage, that is block 101,103,105 and 107 corresponding same feed-trough voltages.At this moment, feed-trough voltage Δ V
101, Δ V
103, Δ V
105And Δ V
107Can be identical, and equal crest voltage V
11, V
12, V
21, V
22, V
31, V
32, V
41And V
42Mean value.If different block can corresponding different feed-trough voltages, then each block can compensate according to corresponding feed-trough voltage respectively, but the therefore effect of booster tension compensation; If the corresponding same feed-trough voltage of different blocks then can compensate according to same feed-trough voltage, thereby can reduce and carry out the required hardware cost of feed-trough voltage compensation.Because electrophoretic display device (EPD) is each pixel that drives display panel with the waveform of drive signal, therefore being compensated for as of above-mentioned feed-trough voltage utilizes the waveform of adjusting drive signal to finish, and the adjustment mode of drive signal then explains after a while.
In addition, the action of the crest voltage of the drain electrode of transistor T can be executed in when carrying out array inspection (array inspection) in each block of above-mentioned measurement, and above-mentioned measurement action can be carried out by the proving installation that carries out the array inspection, can reduce the hardware cost that measures feed-trough voltage with this, and shorten the time that measures feed-trough voltage.
Fig. 3 is the adjustment synoptic diagram according to the drive signal of the electrophoretic display device (EPD) of one embodiment of the invention.Please refer to Fig. 1 and Fig. 3, at present embodiment, during T11 is the replacement of drive signal during this time, T12 is during the data of drive signal write during this time, during T13 is the voltage compensation of drive signal during this time, T13 is optionally configuration wherein, that is during T13 whether exist then on the adjustment mode of the drive signal of each embodiment and decide.
During among the T11, drive signal can form positive pulse wave PP1 and negative pulse wave NP1 in regular turn, so that charged particle is returned to reference position.Wherein, in different embodiment, can have the gap between positive pulse wave PP1 and the negative pulse wave NP1, and the waveform of drive signal of the present invention during replacement can know that usually the knowledgeable's demand designs voluntarily according to this area, waveform shown in Figure 3 is in order to explanation.
During among the T12, the data that drive signal can form positive pulse wave write pulse wave DWP1, and the displacement of charged particle can be proportional to the pulse bandwidth that data write pulse wave DWP1, and the displacement of charged particle can influence the shown GTG value of pixel.Wherein, in different embodiment, data write pulse wave DWP and can be formed by a plurality of positive and negative pulse wave, and this can know that usually the knowledgeable's demand designs voluntarily according to this area, and waveform shown in Figure 3 is in order to explanation.
Write pulse wave DWP with data shown in Figure 3, because feed-trough voltage can make the voltage quasi position reduction that writes pulse wave DWP1 for the data of positive pulse wave, that is can make charged particle can't move to the target location, therefore can form compensation pulse wave (as CP1 or CP2) in drive signal, move not enough part to supply, wherein the pulse bandwidth of the compensation pulse wave (as CP1 or CP2) of the drive signal of corresponding each block can be proportional to the feed-trough voltage of each block correspondence.
In addition, the compensation pulse wave is to be formed at before the positive pulse wave PP1 and negative pulse wave NP1 of replacement charged particle position, and can be formed at data and write before the pulse wave (as compensation pulse wave CP1) or (as compensation pulse wave CP2) afterwards.When the compensation pulse wave be formed at data write pulse wave before (as compensation pulse wave CP1), then compensate pulse wave (as CP1) configurable in during during T11(is the replacement of drive signal) in, and drive signal can omit during T13; When the compensation pulse wave be formed at data write pulse wave after (as compensation pulse wave CP2), then compensate pulse wave (as CP1) for be disposed at during during T13(is the voltage compensation of drive signal) in.
Fig. 4 is the adjustment synoptic diagram according to the drive signal of the electrophoretic display device (EPD) of another embodiment of the present invention.Please refer to Fig. 3 and Fig. 4, its difference is, during during T21(is the replacement of drive signal) in, drive signal can form negative pulse wave NP2 and positive pulse wave PP2 in regular turn, and during T22(be during the data of drive signal write) in data write pulse wave DWP2 and be negative pulse wave.Because feed-trough voltage can make the voltage quasi position reduction that writes pulse wave DWP2 for the data of negative pulse wave, that is can make charged particle be moved beyond the target location, therefore can form compensation pulse wave (as CP3 or CP4) in drive signal, to retract the part that is moved beyond, wherein the pulse bandwidth of the compensation pulse wave (as CP3 or CP4) of the drive signal of corresponding each block can be proportional to the feed-trough voltage of each block correspondence.And, during the compensation pulse wave can be formed among the T21 (as CP3), during perhaps can being formed among the T23 (as CP4).
Fig. 5 is the adjustment synoptic diagram according to the drive signal of the electrophoretic display device (EPD) of yet another embodiment of the invention.Please refer to Fig. 3 and Fig. 5, at present embodiment, the waveform similarity of drive signal is in the waveform (drive signal that does not promptly comprise compensation pulse wave CP1 and CP2) of Fig. 3, that is during positive pulse wave PP3 among the T31 and negative pulse wave NP3 similar in appearance to during positive pulse wave PP1 and negative pulse wave NP1 among the T11, during data among the T32 write pulse wave DWP3 similar in appearance to during data among the T12 write pulse wave DWP1.And its difference is the accurate position of the direct displacement drive voltage of signals of present embodiment, and the voltage quasi position displacement of the drive signal of corresponding each block equals the feed-trough voltage Δ V of each block correspondence.And the mode of the accurate position of displacement drive voltage of signals can see through voltage clamp and finishes, that is when driving the pixel of each block, drive signal can input in the pixel behind the feed-trough voltage clamp of clamp circuit according to correspondence.
According to above-mentioned, can converge the driving method of putting in order out an electrophoretic display device (EPD).Fig. 6 is the process flow diagram according to the driving method of the electrophoretic display device (EPD) of one embodiment of the invention.Please refer to Fig. 6, in the driving method of electrophoretic display device (EPD), all pixels of the display panel of electrophoretic display device (EPD) can be divided into a plurality of blocks (step S610).Then, the common voltage of display panel is set at ground voltage (step S620), and with a plurality of sweep signals all sweep traces (step S630) of input display panel in regular turn, wherein the sweep trace of corresponding same block receives same sweep signal.Then, measure many data lines of display panel,, determine the feed-trough voltage (step S650) of each block correspondence again according to the corresponding respectively crest voltage of these blocks to obtain the crest voltage (step S640) of corresponding each block.And, adjust the drive signal (step S660) of each block correspondence according to the feed-trough voltage of each block correspondence.At last, each block drives (step S670) accordingly according to more adjusted drive signal.Wherein, above-mentioned steps S610, S620, S630, S640 and S650 can be considered a kind of method for measurement of feed-trough voltage of electrophoretic display device (EPD), and the details of above-mentioned steps can then repeat no more at this with reference to the explanation of the foregoing description.
In sum, the driving method of the electrophoretic display device (EPD) of the embodiment of the invention and the method for measurement of feed-trough voltage, it is display panel a plurality of blocks respectively, and the same sweep signal of the pixel basis in the same block and opening, and obtain the crest voltage of each block correspondence by the metric data line.Then, determine the feed-trough voltage of each block correspondence according to the crest voltage of these block correspondences, and driving method can be adjusted the waveform of the drive signal of each block correspondence again according to the feed-trough voltage of each block correspondence.By this, can measure the feed-trough voltage of each block correspondence, and adjust the waveform of the drive signal of each block correspondence in view of the above, so that feed-trough voltage is compensated.
Though the present invention with embodiment openly as above; right its is not in order to limit the present invention; have in the technical field under any and know the knowledgeable usually; without departing from the spirit and scope of the present invention; when doing a little change and retouching, so protection scope of the present invention is as the criterion when looking aforesaid the claim person of defining.
Claims (12)
1. the driving method of an electrophoretic display device (EPD) is characterized in that, comprising:
A plurality of pixels of one display panel of this electrophoretic display device (EPD) are divided into a plurality of blocks;
One common voltage of this display panel is set at one first voltage;
A plurality of sweep signals are imported the multi-strip scanning line of this display panel in regular turn, and wherein the sweep trace of corresponding same block receives same sweep signal;
Measure many data lines of this display panel, to obtain at least one crest voltage of corresponding each those block;
Determine a feed-trough voltage of each those block correspondence according to the corresponding respectively described crest voltage of those blocks;
Adjust a plurality of drive signals of each those block correspondence according to this feed-trough voltage of each those block correspondence; And
Each those block drives according to adjusted those drive signals accordingly.
2. the driving method of electrophoretic display device (EPD) as claimed in claim 1 is characterized in that, those blocks comprise at least one pixel respectively.
3. the driving method of electrophoretic display device (EPD) as claimed in claim 1 is characterized in that, this first voltage is a ground voltage.
4. the driving method of electrophoretic display device (EPD) as claimed in claim 1 is characterized in that, the step of adjusting a plurality of drive signals of each those block correspondence according to this feed-trough voltage of each those block correspondence comprises:
Form a compensation pulse wave on each this drive signal, wherein the pulse bandwidth of this compensation pulse wave is proportional to this feed-trough voltage.
5. the driving method of electrophoretic display device (EPD) as claimed in claim 4 is characterized in that, the data that this compensation pulse wave is formed at each this drive signal write before the pulse wave.
6. the driving method of electrophoretic display device (EPD) as claimed in claim 4 is characterized in that, the data that this compensation pulse wave is formed at each this drive signal write after the pulse wave.
7. the driving method of electrophoretic display device (EPD) as claimed in claim 1 is characterized in that, the step of adjusting a plurality of drive signals of each those block correspondence according to this feed-trough voltage of each those block correspondence comprises:
The voltage quasi position of those drive signals of displacement, wherein the voltage quasi position displacement of those drive signals equals this feed-trough voltage.
8. the driving method of electrophoretic display device (EPD) as claimed in claim 1 is characterized in that, this feed-trough voltage of each those block correspondence is the mean value of the described crest voltage of corresponding each those block.
9. the driving method of electrophoretic display device (EPD) as claimed in claim 1 is characterized in that, this feed-trough voltage of each those block correspondence is the mean value of the described crest voltage of corresponding those blocks.
10. the method for measurement of the feed-trough voltage of an electrophoretic display device (EPD) is characterized in that, comprising:
A plurality of pixels of one display panel of this electrophoretic display device (EPD) are divided into a plurality of blocks;
One common voltage of this display panel is set at one first voltage;
A plurality of sweep signals are imported the multi-strip scanning line of this display panel in regular turn, and those sweep traces of corresponding same block receive same sweep signal;
Measure many data lines of this display panel, to obtain at least one crest voltage of corresponding each those block; And
Determine a feed-trough voltage of each those block correspondence according to the corresponding respectively described crest voltage of those blocks.
11. the method for measurement of the feed-trough voltage of electrophoretic display device (EPD) as claimed in claim 10 is characterized in that, those blocks comprise at least one pixel respectively.
12. the method for measurement of the feed-trough voltage of electrophoretic display device (EPD) as claimed in claim 10 is characterized in that, this first voltage is a ground voltage.
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| CN108510954A (en) * | 2018-04-19 | 2018-09-07 | 京东方科技集团股份有限公司 | Control circuit, display base plate, display device and display methods |
| CN109581774A (en) * | 2019-01-03 | 2019-04-05 | 京东方科技集团股份有限公司 | Display driving method, gate driver and display device |
| CN110070835A (en) * | 2018-01-22 | 2019-07-30 | 矽创电子股份有限公司 | Electronic paper display driving circuit |
| CN110738973A (en) * | 2019-09-09 | 2020-01-31 | 福建华佳彩有限公司 | panel driving method |
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