CN110010080B - Electrophoretic display and driving method thereof - Google Patents
Electrophoretic display and driving method thereof Download PDFInfo
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- CN110010080B CN110010080B CN201810011377.5A CN201810011377A CN110010080B CN 110010080 B CN110010080 B CN 110010080B CN 201810011377 A CN201810011377 A CN 201810011377A CN 110010080 B CN110010080 B CN 110010080B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
- G09G3/344—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on particles moving in a fluid or in a gas, e.g. electrophoretic devices
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Abstract
The invention provides an electrophoretic display and a driving method thereof. An electrophoretic display includes a display panel and a driving circuit. The display panel comprises an electrophoresis unit and a driving substrate. The driving method comprises the following steps: providing a reset signal to the driving substrate to reset at least one of the first electrophoretic particles and the second electrophoretic particles in the electrophoretic cell; and providing a driving signal to the driving substrate to drive the third electrophoretic particles in the electrophoretic cell. In the first driving period of the driving signal, the driving signal includes a plurality of first driving pulses and a plurality of second driving pulses which are staggered. In the second driving period of the driving signal, the driving signal includes a plurality of third driving pulses. The electrophoretic display and the driving method thereof can provide good display quality.
Description
Technical Field
The present invention relates to display technologies, and in particular, to an electrophoretic display and a driving method thereof.
Background
With the advancement of electronic technology, electrophoretic displays are widely used in various display applications and electronic devices, and current electrophoretic displays have been developed to provide color display effects. However, in a conventional color electrophoretic display, the sharpness of the electrophoretic display is easily caused by the blurring of the image edges, and the conventional improvement method is to adjust the end voltage and time of the driving signal to adjust the position of the internally charged electrophoretic particles. However, under certain environmental, material, or driving conditions, the sharpness issue may not be corrected. For example, the electrophoretic cells of a color electrophoretic display include white electrophoretic particles, black electrophoretic particles, and color electrophoretic particles. When the electrophoretic display displays yellow characters on a black matrix, white edges are easily formed on the yellow characters, and the characters are blurred and have poor sharpness. In view of the above, in order to improve the above disadvantages, a plurality of exemplary embodiments will be presented below.
Disclosure of Invention
The invention provides an electrophoretic display and a driving method thereof, which can effectively drive electrophoretic particles of three different colors so as to provide good display quality.
The driving method of the invention is suitable for an electrophoretic display. The electrophoretic display comprises a driving substrate and an electrophoretic unit. The driving method comprises the following steps: providing a reset signal to the driving substrate to reset at least one of the first electrophoretic particles and the second electrophoretic particles in the electrophoretic cell; and providing a driving signal to the driving substrate to drive the third electrophoretic particles in the electrophoretic cell, wherein the driving signal includes a first driving period and a second driving period, and the first driving period occurs before the second driving period. In the first driving period, the driving signal includes a plurality of first driving pulses and a plurality of second driving pulses which are staggered. In the second driving period, the driving signal includes a plurality of third driving pulses. The second driving pulses and the third driving pulses have the same polarity. The first driving pulses and the second driving pulses have opposite polarities.
The invention relates to an electrophoretic display, which comprises an electrophoretic unit, a driving substrate and a driving circuit. The electrophoretic cell includes first, second, and third electrophoretic particles. The driving substrate is disposed under the electrophoresis cell. The driving circuit is coupled to the driving substrate. The driving circuit provides a reset signal to the driving substrate to reset at least one of the first electrophoretic particles and the second electrophoretic particles in the electrophoretic cell. The driving circuit provides a reset signal to the driving substrate to reset at least one of the first electrophoretic particles and the second electrophoretic particles in the electrophoretic cell. The driving circuit provides a driving signal to the driving substrate to drive the third electrophoretic particles in the electrophoretic cell. The driving signal includes a first driving period and a second driving period, and the first driving period occurs before the second driving period. In the first driving period, the driving signal includes a plurality of first driving pulses and a plurality of second driving pulses which are staggered. In the second driving period, the driving signal includes a plurality of third driving pulses. The second driving pulses and the third driving pulses have the same polarity. The first driving pulses and the second driving pulses have opposite polarities.
Based on the above, the electrophoretic display and the driving method thereof of the present invention can effectively drive the third electrophoretic particles by the plurality of second driving pulses and the plurality of third driving pulses of the driving signal, and can effectively prevent the first electrophoretic particles from accumulating on the display side of the electrophoretic cell when the electrophoretic display displays the color of the third electrophoretic particles, so that the third electrophoretic particles can be normally distributed on the display side of the electrophoretic cell.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a block diagram of an electrophoretic display according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a display panel according to an embodiment of the invention.
Fig. 3A is a waveform diagram of signals driving first electrophoretic particles according to an embodiment of the invention.
Fig. 3B is a waveform diagram of signals for driving the second electrophoretic particles according to an embodiment of the invention.
FIG. 3C is a signal waveform diagram for driving color electrophoretic particles according to an embodiment of the invention.
Fig. 4 is a diagram illustrating a luminance variation according to an embodiment of the present invention.
Fig. 5 is a flow chart of a driving method according to an embodiment of the invention.
Description of the symbols:
100: an electrophoretic display;
110: a display panel;
111: an upper electrode layer;
112: an electrophoresis unit;
112A: first electrophoretic particles;
112B: a second electrophoretic particle;
112C: colored electrophoretic particles;
113: a drive substrate;
120: a drive circuit;
311. 312, 313, 331, 332: a square wave signal;
321. 323, 325, 322, 324, 326: a pulse wave signal;
333. 334, 334': a drive pulse wave;
401: an L value change curve;
402: b value change curve;
t1, t3, t4, t5, t6, t6 ', t7, t 7': a length of time;
p1, P2: a driving period;
t: a time interval;
s1: a display side;
s510, S520, S530, S540: and (5) carrying out the following steps.
Detailed Description
In order that the present disclosure may be more readily understood, the following specific examples are given as illustrative of the invention which may be practiced in various ways. Further, wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.
Fig. 1 is a block diagram of an electrophoretic display according to an embodiment of the present invention. Referring to fig. 1, an electrophoretic display 100 includes a display panel 110 and a driving circuit 120. In the present embodiment, the electrophoretic display 100 is a color electrophoretic display device, and has a display effect of displaying at least three colors. The display panel 110 includes a plurality of pixels, and the pixels respectively correspond to a plurality of electrophoretic cells arranged in an array, wherein the electrophoretic cells include electrophoretic particles of three colors. In the present embodiment, the driving circuit 120 is configured to provide a driving signal to the display panel 110 to drive the plurality of electrophoretic particles in the electrophoretic cells. In the present embodiment, the driving circuit 120 drives the electrophoretic particles to move in the electrophoretic cells by applying a voltage, so that each pixel of the display panel 110 can display black, white, gray scale or a specific color. In the present embodiment, the electrophoretic cells are, for example, Microcup structures (Microcup) and have white electrophoretic particles, black electrophoretic particles, and color electrophoretic particles. In the embodiments of the present invention, the electrophoretic color particles refer to the third electrophoretic particles, and the electrophoretic color particles may be, for example, electrophoretic red particles or electrophoretic yellow particles, but the present invention is not limited thereto.
Fig. 2 is a schematic diagram of a display panel according to an embodiment of the invention. Referring to fig. 1 and 2, fig. 2 is a schematic diagram of a plurality of electrophoretic cells of the display panel 110. In the present embodiment, a single pixel of the display panel 110 includes an upper electrode layer 111, a plurality of electrophoretic cells 112, and a driving substrate 113. The electrophoretic cell 112 is disposed between the upper electrode layer 111 and the driving substrate 113, and the display side S1 of the electrophoretic cell 112 is close to the upper electrode layer 111. In the present embodiment, the upper electrode layer 111 is, for example, a transparent electrode layer. The electrophoretic cells 112 respectively include a plurality of first electrophoretic particles 112A, a plurality of second electrophoretic particles 112B, and a plurality of color electrophoretic particles 112C (i.e., third electrophoretic particles). The number of electrophoretic cells 112, and the number of electrophoretic particles of the electrophoretic cells 112 are not limited to those shown in fig. 2. The driving substrate 113 includes, for example, a driving transistor for receiving a driving signal to move the first electrophoretic particles 112A, the second electrophoretic particles 112B, and the color electrophoretic particles 112C of the electrophoretic cell 112 in the electrophoretic cell 112.
In the present embodiment, the first electrophoretic particles 112A may be, for example, negatively charged white electrophoretic particles. The second electrophoretic particles 112B may be, for example, positively charged black electrophoretic particles. The colored electrophoretic particles 112C may be, for example, positively charged red electrophoretic particles or yellow electrophoretic particles. In the present embodiment, the colored electrophoretic particles 112C have a lower charge amount than the second electrophoretic particles 112B. That is, when the driving substrate 113 applies a negative voltage, the negatively charged first electrophoretic particles 112A move toward the display side S1 of the electrophoretic cell 112. When the driving substrate 113 applies a high positive voltage, the positively charged second electrophoretic particles 112B move toward the display side S1 of the electrophoretic cell 112. When the driving substrate 113 applies a low positive voltage, the positively charged color electrophoretic particles 112C move toward the display side S1 of the electrophoretic cell 112. The moving speed of the second electrophoretic particles 112B and the color electrophoretic particles 112C is determined according to the magnitude of the positive voltage applied to the driving substrate 113.
In the present embodiment, when the driving circuit 120 drives the electrophoretic cell 112 to display a specific color (red or yellow), the driving circuit 120 drives the first electrophoretic particles 112A (white) to the display side S1 of the electrophoretic cell 112, drives the second electrophoretic particles 112B (black) to the display side S1 of the electrophoretic cell 112, and drives the colored electrophoretic particles 112C to the display side S1 of the electrophoretic cell 112. In the present embodiment, the driving circuit 120 can provide the voltage signal to the driving substrate 113 in four stages, which are a balance stage, a mixing stage, a reset stage and a driving stage (or a stacking stage) in sequence, wherein the waveforms of the signals for driving the first electrophoretic particles 112A, the second electrophoretic particles 112B and the color electrophoretic particles 112C are described below with reference to fig. 3A to 3C, respectively.
Fig. 3A is a waveform diagram of signals driving first electrophoretic particles according to an embodiment of the invention. Referring to fig. 1 to 3A, in the present embodiment, when the driving circuit 120 drives the electrophoretic cell 112 to display a specific color (red or yellow), the driving circuit 120 drives the first electrophoretic particles 112A (white) to the display side S1 of the electrophoretic cell 112 first. Therefore, in the balancing phase, the driving circuit 120 provides a balancing signal to the driving substrate 113 to balance the charges of the first electrophoretic particles 112A. In the present embodiment, the balance signal includes a square wave signal 311, and the square wave signal 311 is, for example, a +15 volt (volt) voltage signal with a time length t 1.
Then, in the mixing stage, the driving circuit 120 provides a mixing signal to the driving substrate 113 to uniformly disperse the first electrophoretic particles 112A, the second electrophoretic particles 112B and the color electrophoretic particles 112C. In the present embodiment, the mixed signal includes a plurality of positive pulse signals 321 and a plurality of negative pulse signals 322 that are staggered. The positive pulse signal 321 is used to drive the first electrophoretic particles 112A. The negative pulse signal 322 is used to drive the second electrophoretic particles 112B and the color electrophoretic particles 112C. The amplitude of the positive pulse signal 321 is equal to the amplitude of the negative pulse signal 322. The positive pulse signal 321 is, for example, a +15 volt voltage signal. The negative pulse signal 322 is, for example, a voltage signal of-15 volts.
Finally, in the reset phase, the driving circuit 120 provides a reset signal to the driving substrate 113 to reset the first electrophoretic particles 112A. In the present embodiment, the reset signal includes a plurality of negative square wave signals 331 to drive the first electrophoretic particles 112A to the display side S1 of the electrophoretic cell 112. In the present embodiment, the negative square wave signal 331 is, for example, a-15 volt voltage signal with a time length t 2. However, in one embodiment, the reset signal includes, for example, 15 negative square wave signals 331, and the time length t2 of each of the negative square wave signals 331 is 20 milliseconds (ms), but the invention is not limited thereto. Accordingly, the first electrophoretic particles 112A may be effectively pushed to the display side S1 of the electrophoretic cell 112.
Fig. 3B is a waveform diagram of signals for driving the second electrophoretic particles according to an embodiment of the invention. Referring to fig. 1, fig. 2 and fig. 3B, in the present embodiment, the driving circuit 120 then drives the second electrophoretic particles 112B (black) to the display side S1 of the electrophoretic cell 112. Therefore, in the balancing phase, the driving circuit 120 provides a balancing signal to the driving substrate 113 to balance the charges of the second electrophoretic particles 112B. In the present embodiment, the balancing signal includes a negative square wave signal 312, and the negative square wave signal 312 is, for example, a voltage signal of-15 volts having a time length t 3.
Then, in the mixing stage, the driving circuit 120 provides a mixing signal to the driving substrate 113 to uniformly disperse the first electrophoretic particles 112A, the second electrophoretic particles 112B and the color electrophoretic particles 112C. In the present embodiment, the mixed signal includes a plurality of positive pulse signals 323 and a plurality of negative pulse signals 324, and the positive pulse signals 323 are used to drive the first electrophoretic particles 112A, and the negative pulse signals 324 are used to drive the second electrophoretic particles 112B and the color electrophoretic particles 112C. The amplitude of the positive pulse signal 323 is equal to the amplitude of the negative pulse signal 324. The positive pulse signal 323 is, for example, a +15 volt voltage signal. The negative pulse signal 324 is, for example, a voltage signal of-15 volts.
Finally, in the reset phase, the driving circuit 120 provides a reset signal to the driving substrate 113 to reset the second electrophoretic particles 112B. In the present embodiment, the reset signal includes a plurality of positive square wave signals 332 to drive the second electrophoretic particles 112B to the display side S1 of the electrophoretic cell 112. In the present embodiment, the square wave signal 332 is, for example, a voltage signal of +15 volts with a time length t 4. However, in one embodiment, the reset signal includes, for example, 15 square wave signals 332, and the time length t4 of each of the square wave signals 332 is 20 ms, but the invention is not limited thereto. Accordingly, the second electrophoretic particles 112B may be effectively pushed to the display side S1 of the electrophoretic cell 112.
FIG. 3C is a signal waveform diagram for driving color electrophoretic particles according to an embodiment of the invention. Referring to fig. 1, fig. 2 and fig. 3C, in the present embodiment, the driving circuit 120 then drives the colored electrophoretic particles 112C (red or yellow) to the display side S1 of the electrophoretic cell 112. Therefore, in the balance phase, the driving circuit 120 provides a balance signal to the driving substrate 113 to make the first electrophoretic particles 112A, the second electrophoretic particles 112B and the color electrophoretic particles 112C in the electrophoretic cell 112 in a charge balance state. In the present embodiment, the balance signal includes a negative square wave signal 313, and the negative square wave signal 313 is, for example, a voltage signal of-15 volts having a time length t 5.
Then, in the mixing stage, the driving circuit 120 provides a mixing signal to the driving substrate 113 to uniformly disperse the first electrophoretic particles 112A, the second electrophoretic particles 112B and the color electrophoretic particles 112C. In the present embodiment, the mixed signal includes a plurality of positive pulse signals 325 and a plurality of negative pulse signals 326 that are staggered. The positive pulse 325 drives the first electrophoretic particle 112A, and the negative pulse 326 drives the second electrophoretic particle 112B and the color electrophoretic particle 112C. The amplitude of the positive pulse signal 325 is equal to the amplitude of the negative pulse signal 326. The positive pulse signal 325 is, for example, a +15 volt voltage signal. The negative pulse signal 326 is, for example, a voltage signal of-15 volts.
Finally, in the driving phase, the driving circuit 120 provides driving signals to the driving substrate 113 to drive the first electrophoretic particles 112A and the color electrophoretic particles 112C. In other words, in the process of driving the color electrophoretic particles 112C, the driving circuit 120 simultaneously pushes the first electrophoretic particles 112A to a specific equal position and the color electrophoretic particles 112C to the display side S1 of the electrophoretic cell 112. In the present embodiment, the driving signal includes a plurality of first driving pulses 333, a plurality of second driving pulses 334, and a plurality of third driving pulses 334'. The first driving pulse 333 is used to drive the first electrophoretic particle 112A, and the second driving pulse 334 and the third driving pulse 334' are used to drive the color electrophoretic particle 112C. The second driving pulse 334 and the third driving pulse 334' have the same polarity (both positive voltage pulses), and the first driving pulse 333 and the second driving pulse 334 have opposite polarities (the first driving pulse 333 is a negative voltage pulse and the second driving pulse 334 is a positive voltage pulse).
In the present embodiment, the driving signal includes the first driving period P1 and the second driving period P2, and the first driving period P1 occurs before the second driving period P2. In the first driving period P1, the driving signal includes the first driving pulses 333 and the second driving pulses 334 that are staggered, and the first driving period P1 is initially the first driving pulse 333. In the second driving period P2, the driving signal includes the third driving pulses 334 'and the driving signal has the last of the first driving pulses 333 before the third driving pulses 334'. In the present embodiment, the number of the first driving pulses 333 is less than the sum of the second driving pulses 334 and the third driving pulses 334'. The amplitude of the first drive pulse 333 is greater than the second drive pulse 334. The time lengths t6, t6 ' of the first driving pulse 333 are less than the time length t7 of the second driving pulse 334 and the time length t7 ' of the third driving pulse 334 '. That is, when the driving circuit 120 drives the color electrophoretic particles 112C by the second driving pulse 334, the driving circuit 120 drives the first electrophoretic particles 112A in advance before each pulse of the second driving pulse 334 to push the first electrophoretic particles 112A to a specific equal position of the electrophoretic cell 112. In other words, the driving phase actually includes the time to reset the first electrophoretic particles 112A to a specific equal position of the electrophoretic cell 112.
In the present embodiment, the first driving pulse 333 is, for example, a voltage signal of-15 volts with time lengths t6 and t 6'. The second driving pulse 334 is, for example, a voltage signal of +5 volts with a time duration t 7. The third driving pulse 334 'is, for example, a voltage signal of +5 volts with a time duration t 7'. Also, before the third driving pulse 334 ', the driving signal has the last one of the first driving pulses 333, wherein the last one of the first driving pulses 333 is, for example, a voltage signal of-15 volts having a time length t 6'. In one embodiment, the driving signal may include 7 first driving pulses 333, and the sum of the second driving pulse 334 and the third driving pulse 334' is 9. The time length t6, t 6' of each of the first driving pulses 333 may be 60 milliseconds. The time length t7 of each of the second driving pulses 334 may be 500 ms, and the time length t7 'of each of the third driving pulses 334' may also be 500 ms, but the invention is not limited thereto. However, in another embodiment, the time length t 6' of the last one of the first driving pulses 333 may be the same as or different from the time lengths t6 of the other first driving pulses 333. The voltage level or the time duration t7 of the second driving pulse 334 may be the same as or different from the voltage level or the time duration t7 'of the third driving pulse 334'. The voltage level of the second driving pulse 334 is between 0V and 15V, i.e., between 0V and less than or equal to the amplitude of the first driving pulse 333. Accordingly, the colored electrophoretic particles 112C may be effectively pushed to the display side S1 of the electrophoretic cell 112, and the first electrophoretic particles 112A may be effectively pushed to a specific equal position of the electrophoretic cell 112.
Referring to fig. 1 to 3C, in more detail, when the electrophoretic cell 112 is actually driven to display a specific color (red or yellow) on the display side S1, the driving circuit 120 provides all the signals of fig. 3A to 3C to the driving substrate 113 (combines the voltage signals of the waveforms of fig. 3A to 3C) to drive the first electrophoretic particles 112A, the second electrophoretic particles 112B and the color electrophoretic particles 112C in the electrophoretic cell 112. It should be noted that the timings of the voltage signals in fig. 3A to 3C are not corresponding to each other, but the voltage signals in fig. 3A to 3C in the balance phase, the mixing phase, the reset phase and the driving phase are provided to the driving substrate 113 in sequence.
Specifically, first, in the balancing phase, the driving circuit 120 provides a balancing signal to the driving substrate 113. The balance signal includes, for example, a positive square wave signal 311, a negative square wave signal 312, and a negative square wave signal 313 in sequence, so as to balance the accumulated charges of the electrophoretic particles during the reset phase and the driving phase of the electrophoretic cell 112. Accordingly, when the driving is completed, each electrophoretic particle of the electrophoretic cell 112 is in a charge-neutralized state. In the present embodiment, the voltage amplitudes, time lengths and sequences of the square wave signal 311, the negative square wave signal 312 and the negative square wave signal 313 can be determined according to different charge balance requirements, and the invention is not limited thereto.
Next, in the mixing stage, the driving circuit 120 provides a mixed signal to the driving substrate 113. The mixed signal includes a plurality of positive pulse signals 321, 323, 325 and a plurality of negative pulse signals 322, 324, 326, which are staggered, so that the first electrophoretic particles 112A, the second electrophoretic particles 112B and the color electrophoretic particles 112C are uniformly distributed in the electrophoretic cell 112. In addition, in the present embodiment, the voltage amplitudes, the time lengths and the sequence of the positive pulse signals 321, 323 and 325 and the negative pulse signals 322, 324 and 326 may be determined according to different electrophoretic particle characteristics, and the invention is not limited thereto.
Then, in the reset phase, the driving circuit 120 provides a reset signal to the driving substrate 113 to reset the first electrophoretic particles 112A and the second electrophoretic particles 112B. In the present embodiment, the driving circuit 120 resets the first electrophoretic particles 112A first and then resets the second electrophoretic particles 112B, such that the first electrophoretic particles 112A are first stacked on the display side S1 of the electrophoretic cell 112 and the second electrophoretic particles 112B are then stacked on the display side S1 of the electrophoretic cell 112. Therefore, the driving circuit 120 provides the plurality of negative square-wave signals 331 to the driving substrate 113 first, and then provides the plurality of positive square-wave signals 332 to the driving substrate 113. In addition, in the embodiment, the voltage amplitudes, time lengths and sequences of the negative square wave signal 331 and the positive square wave signal 332 can be determined according to different electrophoretic particle characteristics, and the invention is not limited thereto.
Finally, in the driving phase, the driving circuit 120 provides driving signals to the driving substrate 113 to drive the first electrophoretic particles 112A and the color electrophoretic particles 112C. Taking fig. 3C as an example, in the first driving period P1, the driving circuit 120 first pulls down a voltage signal of-15 volts to push the first electrophoretic particles 112A to move toward a specific equal position of the electrophoretic cell 112. The driving circuit 120 then provides a voltage signal of +5 volts to push the color electrophoretic particles 112C to move toward the display side S1 of the electrophoretic cell 112. The driver circuit 120 cyclically outputs a voltage signal of-15 volts and a voltage signal of +5 volts. After the first electrophoretic particles 112A are pushed, the driving circuit 120 continues to provide a plurality of + 5v voltage signals during the second driving period P2 to push the color electrophoretic particles 112C to move toward the display side S1 of the electrophoretic cell 112. The drive signal will pull down a-15 volt voltage signal before these +5 volt voltage signals. When the second driving period P2 ends, the first electrophoretic particles 112A are located at a specific uniform position of the electrophoretic cell 112, and the color electrophoretic particles 112C are deposited on the display side S1 of the electrophoretic cell 112. In addition, in the embodiment, the voltage amplitude, the time length, and the sequence of the driving pulses of the driving signal may be determined according to different electrophoretic particle characteristics, and the invention is not limited thereto.
Fig. 4 is a diagram illustrating a luminance variation according to an embodiment of the present invention. Referring to fig. 1, 2 and 4, for example, when the driving circuit 120 drives the electrophoresis unit 112 according to the voltage signals shown in fig. 3A to 3C to make the electrophoresis unit 112 display a specific color (e.g., yellow), the L-value change curve 401 rapidly rises in the time interval T of the reset phase and then falls to between 50 and 60 brightness values (L), and the b-value change curve 402 rises and maintains to between 60 and 70 brightness values after the reset phase. In this example, the unit of the luminance value is, for example, cd/m2. In this example, the L-value variation curve 401 represents whether the first electrophoretic particles 112A (white) are driven on the display side S1 of the electrophoretic cell 112. The b-value variation curve 402 represents whether the colored electrophoretic particles 112C (e.g., yellow) are driven to the display side S1 of the electrophoretic cell 112.
In this example, since the driving circuit 120 drives the first electrophoretic particles 112A to move to the specific equal positions of the electrophoretic cell 112 when the driving circuit 120 drives the color electrophoretic particles 112C to move to the display side S1 of the electrophoretic cell 112, the situation that the first electrophoretic particles 112A drive the edge of the display side S1 of the electrophoretic cell 112 to cause a white edge after the driving of the first electrophoretic particles 112A is finished and the driving of the color electrophoretic particles 112C is finished due to the first electrophoretic particles 112A driving the edge of the display side S1 of the electrophoretic cell 112 can be avoided. In other words, the driving method of the present invention can effectively shorten the time length of the time interval T, so as to effectively avoid the occurrence of white edges at the edges of the pixels while the pixels display a specific color (e.g. yellow).
Fig. 5 is a flow chart of a driving method according to an embodiment of the invention. Referring to fig. 1, fig. 2, and fig. 5, the driving method of fig. 5 may be at least applicable to the electrophoretic display 100 of fig. 1. In step S510, the driving circuit provides a balance signal to the driving substrate. In step S520, the driving circuit 120 provides a mixed signal to the driving substrate 113, wherein the mixed signal includes a plurality of positive pulse signals and a plurality of negative pulse signals, the positive pulse signals are used for driving the first electrophoretic particles 112A, and the negative pulse signals are used for driving the second electrophoretic particles 112B. In step S530, the driving circuit 120 provides a reset signal to the driving substrate 113 to reset at least one of the first electrophoretic particles 112A and the second electrophoretic particles 112B in the electrophoretic cell 112. In step S540, the driving circuit 120 provides a driving signal to the driving substrate 113 to drive the color electrophoretic particles 112C in the electrophoretic cell 112, wherein the driving signal includes a first driving period and a second driving period, and the first driving period occurs before the second driving period. In the first driving period, the driving signal includes a plurality of first driving pulses and a plurality of second driving pulses which are staggered. In the second driving period, the driving signal includes a plurality of third driving pulses. The second driving pulses and the third driving pulses have the same polarity, and the first driving pulses and the second driving pulses have opposite polarities. Therefore, in the present embodiment, when the electrophoretic display 100 displays the color of the color electrophoretic particles 112C, the first electrophoretic particles 112A can be effectively prevented from being accumulated on the display side S1 of the electrophoretic cells 112, so that the color electrophoretic particles 112C can be normally distributed on the display side S1 of the electrophoretic cells 112.
In addition, with reference to the description of the embodiment of fig. 1 to 4, sufficient teaching, suggestion and implementation descriptions can be obtained for the detailed technical features and implementation of the electrophoretic display 100 and each signal waveform of the embodiment, and thus no further description is provided.
In summary, the electrophoretic display and the driving method thereof of the present invention can effectively drive the first electrophoretic particles, the second electrophoretic particles and the third electrophoretic particles (preferably, the color electrophoretic particles) in the electrophoretic cells by the voltage signals of the balancing stage, the mixing stage, the resetting stage and the driving stage, and drive the first electrophoretic particles to the specific equal positions of the electrophoretic cells and the third electrophoretic particles to the display side of the electrophoretic cells by the first driving pulses and the second driving pulses which are staggered in the driving signals. Therefore, when the display panel displays the color of the third electrophoretic particles, the electrophoretic display and the driving method thereof of the present invention can effectively prevent the first electrophoretic particles from accumulating at the edge of the display side of the electrophoretic cell, so that the third electrophoretic particles can be normally distributed at the display side of the electrophoretic cell. Accordingly, the electrophoretic display and the driving method thereof can provide good display quality.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (10)
1. A driving method for an electrophoretic display, wherein the electrophoretic display comprises a display panel and a driving circuit, and the display panel comprises an electrophoretic cell and a driving substrate, wherein the driving method comprises:
providing a reset signal to the driving substrate to reset at least one of the first electrophoretic particles and the second electrophoretic particles in the electrophoretic cell; and
providing a drive signal to the drive substrate to drive third electrophoretic particles in the electrophoretic cell, wherein the drive signal comprises a first drive period and a second drive period, and the first drive period occurs before the second drive period,
in the first driving period, the driving signal includes a plurality of first driving pulses and a plurality of second driving pulses, which are staggered, and in the second driving period, the driving signal includes a plurality of third driving pulses, the polarity of the plurality of second driving pulses is the same as that of the plurality of third driving pulses, and the polarity of the plurality of first driving pulses is opposite to that of the plurality of second driving pulses.
2. The driving method as claimed in claim 1, wherein the driving signal comprises a last one of the first driving pulses before the plurality of third driving pulses.
3. The driving method according to claim 1, wherein the plurality of first driving pulses drive the first electrophoretic particles in the electrophoretic cell and the plurality of second driving pulses drive the third electrophoretic particles in the electrophoretic cell.
4. The driving method as claimed in claim 1, wherein the number of the first driving pulses is less than the sum of the second driving pulses and the third driving pulses, the amplitudes of the first driving pulses are greater than or equal to the second driving pulses, and the time lengths of the first driving pulses are less than the time lengths of the second driving pulses.
5. The driving method according to claim 1, wherein the first electrophoretic particles are white electrophoretic particles, the second electrophoretic particles are black electrophoretic particles, and the third electrophoretic particles are color electrophoretic particles.
6. An electrophoretic display, comprising:
a display panel, comprising:
an electrophoretic cell including first, second, and third electrophoretic particles; and
a driving substrate disposed below the electrophoresis cell; and
a driving circuit coupled to the driving substrate for driving the display panel,
wherein the driving circuit provides a reset signal to the driving substrate to reset at least one of the first electrophoretic particles and the second electrophoretic particles in the electrophoretic cell, and provides a driving signal to the driving substrate to drive the third electrophoretic particles in the electrophoretic cell, wherein the driving signal includes a first driving period and a second driving period, and the first driving period occurs before the second driving period,
in the first driving period, the driving signal includes a plurality of first driving pulses and a plurality of second driving pulses, which are staggered, and in the second driving period, the driving signal includes a plurality of third driving pulses, the polarity of the plurality of second driving pulses is the same as that of the plurality of third driving pulses, and the polarity of the plurality of first driving pulses is opposite to that of the plurality of second driving pulses.
7. The electrophoretic display of claim 6, wherein the driving signal comprises a last one of the plurality of first driving pulses before the plurality of third driving pulses.
8. The electrophoretic display of claim 6, wherein the plurality of first drive pulses drive the first electrophoretic particles in the electrophoretic cells and the plurality of second drive pulses drive the third electrophoretic particles in the electrophoretic cells.
9. The electrophoretic display of claim 6, wherein the number of the first driving pulses is less than the sum of the second driving pulses and the third driving pulses, the amplitude of the first driving pulses is greater than the second driving pulses, and the time length of the first driving pulses is less than the time length of the second driving pulses.
10. The electrophoretic display of claim 6, wherein the first electrophoretic particles are white electrophoretic particles, the second electrophoretic particles are black electrophoretic particles, and the third electrophoretic particles are color electrophoretic particles.
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| CN201810011377.5A CN110010080B (en) | 2018-01-05 | 2018-01-05 | Electrophoretic display and driving method thereof |
| TW107119645A TWI691774B (en) | 2018-01-05 | 2018-06-07 | Electro-phoretic display and driving method thereof |
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| CA3177382A1 (en) | 2020-06-05 | 2021-12-09 | E Ink California, Llc | Electrophoretic display device |
| WO2021247816A1 (en) | 2020-06-05 | 2021-12-09 | E Ink California, Llc | Methods for achieving color states of lesser-charged particles in electrophoretic medium including at least four types of particles |
| KR20230078806A (en) * | 2020-11-02 | 2023-06-02 | 이 잉크 코포레이션 | Enhanced push-pull (EPP) waveforms for achieving primary color sets in multi-color electrophoretic displays |
| CN113380201B (en) * | 2021-06-22 | 2023-06-30 | 北京京东方光电科技有限公司 | Electronic paper display screen, display control method thereof and electronic paper display device |
| CN113707100B (en) * | 2021-07-20 | 2023-04-18 | 中山职业技术学院 | Driving method for eliminating color ghost of three-color electrophoretic electronic paper |
| JP2024532918A (en) * | 2021-09-06 | 2024-09-10 | イー インク コーポレイション | Method for driving an electrophoretic display device - Patent application |
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| TWI691774B (en) | 2020-04-21 |
| CN110010080A (en) | 2019-07-12 |
| TW201930995A (en) | 2019-08-01 |
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