Electrophoretic display panel, driving method thereof and display device

Abstract

The present invention provides an electrophoretic display panel, a driving method thereof, and a display device, including data lines and pixels, the data lines being configured to transmit data signals to the pixels, the data signals including a plurality of unit periods; in the driving stage, the unit driving voltage of the data signal is Vi in the ith unit time period ti; the target effective drive is Vm, Vm is equal to sigma Viti, and i is a positive integer; the theoretical effective drive meets at least one of the following relational expressions: (1) when the target gray scale is fixed, # imgabs0 # 0.23 < A < 0.29,-20 < B < 10; according to the relational expression (2), when the initial gray scale is fixed, C is larger than # imgabs1 #-0.22 and smaller than-0.10, and D is larger than 0 and smaller than 25; the difference between the target effective drive and the theoretical effective drive is smaller than or equal to 5. Therefore, the effective drive of the required drive waveform can be calculated according to at least one formula, the initial gray scale and the target gray scale, the gray scale is further adjusted according to the drive waveform, and the speed and accuracy of gray scale adjustment are improved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to an electrophoretic display panel, a driving method thereof, and a display device. Background Art

[0002] Electronic paper (E-paper) is a display screen that uses electronic ink coated on a thin film and attached to a thin-film transistor circuit, which is then driven to form pixel graphics. E-paper offers advantages such as energy saving, eye protection, and the ability to maintain its display even after a power outage. It can mimic the visual experience of printing and writing on paper. Its principle is electrophoresis of charged particles, where two oppositely charged particles, driven by an electric field, move to the opposite poles of the display, causing one side of the transparent electrode to display the color of the charged particles.

[0003] Currently, the grayscale of electronic paper is generally controlled using PWM mode. However, due to temperature, historical and nonlinear problems of electronic paper driving, the driving time and grayscale are not in a simple linear relationship, so fast and accurate grayscale adjustment is very difficult. Summary of the Invention

[0004] Based on the above problems, the present invention provides an electrophoretic display panel, a driving method thereof, and a display device. According to at least one formula, an initial grayscale, and a target grayscale, the effective driving force of the required driving waveform is calculated, and the grayscale is further adjusted according to the driving waveform to improve the speed and accuracy of the grayscale adjustment.

[0005] In a first aspect, an embodiment of the present invention provides an electrophoretic display panel, comprising a data line and a pixel, wherein the data line is configured to transmit a data signal to the pixel, the data signal comprising a plurality of unit periods;

[0006] In the driving phase of the electrophoretic display panel, in the i-th unit period t i The unit driving voltage of the data signal is V i ; The target effective drive is V m , V m =∑V i t i , where i is a positive integer;

[0007] Theoretically, effective driving satisfies at least one of the following relationships:

[0008] Relationship (1), when the target grayscale is fixed,

[0009] Wherein, x is the initial grayscale, y is the target grayscale, V lis the theoretical effective drive, x and y are integers, 0.23<A<0.29, -20<B<10; n is the number of gray levels of the electrophoretic display panel in a driving mode;

[0010] Relationship (2), when the initial grayscale is fixed,

[0011] Among them, -0.22<C<-0.10, 0<D<25;

[0012] A difference between the target effective driving force and the theoretical effective driving force is less than or equal to 5.

[0013] Based on the same inventive concept, in a second aspect, an embodiment of the present invention provides a display device, comprising the electrophoretic display panel described in the first aspect.

[0014] Based on the same inventive concept, in a third aspect, an embodiment of the present invention provides a driving method of an electrophoretic display panel, including the electrophoretic display panel described in the first aspect.

[0015] In the electrophoretic display panel provided by the embodiment of the present invention, in the driving phase of the electrophoretic display panel, in the i-th unit period t i The unit driving voltage of the data signal is V i , the target effective drive is V m , satisfying: V m =∑V i t i , that is, the target effective drive is the cumulative sum of the unit drive voltage and the unit period time; further, the theoretical effective drive satisfies at least one of the following relationships: when the target grayscale is fixed, it satisfies: 0.23<A<0.29, -20<B<10; when the initial grayscale is fixed, it satisfies: -0.22<C<-0.10,0<D<25;wherein, x is the initial grayscale, y is the target grayscale, V l is the theoretical effective drive, and n is the number of grayscales of the electrophoretic display panel in a driving mode; the difference between the target effective drive and the theoretical effective drive is small, and the relationship satisfied by the theoretical effective drive can be used to describe the law satisfied by each numerical point of the target effective drive. The driving waveform determined according to the target effective drive is relatively accurate; on the other hand, during debugging, the value of the theoretical effective drive is obtained according to the relationship (1) and / or the relationship (2), and based on the value of the theoretical effective drive, the test is conducted near the value of the theoretical effective drive, and a suitable effective drive value is found as the target effective drive. Compared with blind debugging without any basis, the speed and accuracy of grayscale adjustment are improved, and the difficulty of grayscale calibration during the test of the electrophoretic display panel can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a top view of an electrophoretic display panel provided by an embodiment of the present invention;

[0017] Figure 2 A schematic cross-sectional view of an electrophoretic display panel provided by an embodiment of the present invention;

[0018] Figure 3 A driving timing diagram of an electrophoretic display panel provided by an embodiment of the present invention;

[0019] Figure 4 A schematic diagram of the relationship between an initial grayscale and effective driving provided by an embodiment of the present invention;

[0020] Figure 5 A schematic diagram of the relationship between a target grayscale and effective driving provided by an embodiment of the present invention;

[0021] Figure 6 A schematic diagram of another relationship between initial grayscale and effective driving provided by an embodiment of the present invention;

[0022] Figure 7 A driving timing diagram of another electrophoretic display panel provided by an embodiment of the present invention;

[0023] Figure 8 A driving timing diagram of another electrophoretic display panel provided by an embodiment of the present invention;

[0024] Figure 9 A driving timing diagram of another electrophoretic display panel provided by an embodiment of the present invention;

[0025] Figure 10 A schematic cross-sectional view of another electrophoretic display panel provided by an embodiment of the present invention;

[0026] Figure 11 A schematic cross-sectional view of another electrophoretic display panel provided by an embodiment of the present invention;

[0027] Figure 12 A schematic diagram of a top view of a display device provided by an embodiment of the present invention;

[0028] Figure 13 A flowchart of a driving method of an electrophoretic display panel according to an embodiment of the present invention;

[0029] Figure 14 The present invention is a flowchart of another method for driving an electrophoretic display panel according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0031] Figure 1 A schematic diagram of a top view of an electrophoretic display panel according to an embodiment of the present invention is provided. Figure 1 As shown, the electrophoretic display panel 10 includes data lines 21 and pixels 22. The data lines 21 are configured to transmit data signals to the pixels 22. The plurality of data lines 21 extend along a first direction X and are arranged along a second direction Y. The first direction X intersects the second direction Y. Furthermore, the electrophoretic display panel 10 also includes scan lines 23. The scan lines 23 are configured to transmit scan signals to the pixels 22. The scan signals are signals that control the conduction of the thin film transistors 20. The plurality of scan lines 23 extend along the second direction Y and are arranged along the first direction X. When the thin film transistors 20 are turned on, the data signals are written to the pixels 22. By writing different data signals to different pixels 22, the electrophoretic display panel 10 can display a specific image.

[0032] Figure 2 A schematic cross-sectional view of an electrophoretic display panel according to an embodiment of the present invention is provided. Figure 2 As shown, the electrophoretic display panel 10 includes a first substrate 11, a second substrate 12 and electrophoretic particles 13. The first substrate 11 and the second substrate 12 are arranged opposite to each other, and the electrophoretic particles 13 are located between the first substrate 11 and the second substrate 12. In the electrophoretic display panel 10, the data lines 21, the pixels 23 and the scan lines 23 can be located on the same side of the first substrate 11 facing the electrophoretic particles 13. That is, the data lines 21, the pixels 23 and the scan lines 23 are arranged on the first substrate 11, and the electrophoretic particles 13 are arranged on the side where the data lines 21, the pixels 23 and the scan lines 23 are arranged. Optionally, the electrophoretic particles 13 may include black electrophoretic particles and white electrophoretic particles. Under the action of the electric field, when the black electrophoretic particles are located on the display side of the electrophoretic display panel (for example, the side of the second substrate 12 away from the first substrate 11), the light is absorbed by the black electrophoretic particles, so that less light is reflected to the human eye, which appears as a dark area to the human eye, for example, with a grayscale value of 0. When the white electrophoretic particles are located on the display side of the electrophoretic display panel, light is reflected by the white electrophoretic particles, resulting in more light being reflected to the human eye, which appears as a bright area, for example, with a grayscale value of 63 or 15. When the black and white electrophoretic particles are located between the second substrate 12 and the first substrate 11, some light is reflected and some is absorbed, which appears as a gray area to the human eye, with a grayscale value between 0 and 64, or between 0 and 15. The embodiments of the present invention can be explained using a dual-particle system, but are not limited thereto.

[0033] Figure 3 A driving timing diagram of an electrophoretic display panel provided by an embodiment of the present invention is provided. Figure 1 and Figure 3 As shown, the data signal Source includes multiple unit time periods P0. The duration of the enable level of the data signal Source is an integer multiple of the unit time period P0. In the driving stage of the electrophoretic display panel 10, multiple data lines 21 write different data signals Source for different pixels 22, so that different pixels 22 can have different display brightness, and different pixels 22 can have different grayscales. Due to the influence of different parameters of the electrophoretic display panel 10, the grayscale of the pixel 22 is not linearly related to the driving duration, so it is difficult to adjust the grayscale according to the display requirements. For example, the parameters can be the temperature factor of the electrophoretic display panel 10 and the display influence of the previous picture, etc., and the embodiment of the present invention does not specifically limit this.

[0034] In the driving phase, in the i-th unit period t i The unit driving voltage of the data signal Source is V i , the target effective drive is V m , then the target effective drive is: V m =∑V i t i , where i is a positive integer. i The time length of the unit period P0 is equal to the time length of the unit period P0. In one embodiment, the time length of the unit period P0 is the time length of the scanning frame. Figure 1 In one scanning frame, the first scanning line 23 is scanned to the last scanning line 23 line by line. The unit driving voltage is V i is the normalized driving voltage. The i-th unit driving voltage is V i The voltage value is 1V. The target effective drive is V m It represents the cumulative value of the product of voltage and time. The target effective drive can be understood as the value of the effective drive actually applied.

[0035] Figure 4 A schematic diagram of the relationship between an initial grayscale and an effective drive according to an embodiment of the present invention is provided. Figure 4 As shown, Figure 4 The value of the horizontal axis represents the value of the initial grayscale, and the value of the vertical axis represents the value of the effective drive. The effective drive includes the target effective drive and the theoretical effective drive. Figure 4Multiple discrete points are shown, and the effective drive corresponding to each discrete point is the target effective drive. A discrete point can be understood as a point in the coordinate system determined by a certain initial grayscale and a certain effective drive value when the target grayscale is a fixed value. The initial grayscale is the grayscale value corresponding to the start of the current image, i.e., the grayscale value corresponding to the end of the previous image. The target grayscale is the preset grayscale value to be achieved. Figure 4 Two fitting curves are shown in ( Figure 4 s1 and s2 shown in the figure), the fitting curve is a relationship between the theoretical effective drive and the initial grayscale when the target grayscale is fixed. Substituting the initial grayscale into the relationship, the effective drive obtained is the theoretical effective drive. Where the difference between the target effective drive and the theoretical effective drive is less than or equal to 5, it can be understood that the effective drive obtained by the fitting curve is the same or similar to the actual target effective drive.

[0036] Optionally, the difference between the target effective driving force and the theoretical effective driving force is less than or equal to 2.

[0037] Furthermore, the difference between the target effective drive and the theoretical effective drive is less than or equal to 1.

[0038] Exemplary, reference Figure 4 As shown, when the electrophoretic display panel is driven at 64 grayscales and the target grayscale is a fixed value, when the initial grayscale is 0 (y=0), the difference between the target effective drive and the theoretical effective drive is less than or equal to 5; when the initial grayscale is 5 to 8 (y=5, y=6, y=7 or y=8), the difference between the target effective drive and the theoretical effective drive is less than or equal to 2; when the initial grayscale takes other values, the difference between the target effective drive and the theoretical effective drive is less than or equal to 1.

[0039] When the target grayscale is a fixed value, the target effective drive value corresponding to the initial grayscale is stored in the driver chip. The electrophoretic display panel can directly obtain the discrete effective drive value by looking up the table in the driver chip, that is, directly looking up the table to obtain the target effective drive value, and then obtain the accurate driving waveform, and then adjust the grayscale according to the driving waveform, which can improve the speed and accuracy of the grayscale adjustment.

[0040] Specifically, Figure 4 The acquisition of discrete points and the fitting of the relationship under 64 grayscale driving of the electrophoretic display panel are used as an example. When the target grayscale is a fixed value, the fitted relationship satisfies: Relationship (1), Among them, x is the initial grayscale, y is the target grayscale, V lFor theoretical effective drive, x and y are integers, 0.23<A<0.29, -20<B<10. n is the number of grayscales of the electrophoretic display panel in a driving mode. In the current embodiment, n is the number of grayscales of the electrophoretic display panel in a 64-grayscale driving mode, and n is equal to 64. In other embodiments, n can take other positive integer values. The present invention does not limit the value of n, which can be an odd number or an even number. For example, A can be 0.26. Exemplarily, the relationship obtained by fitting can be: V l =0.2688x+5.75 or V l =0.2688x-15.375. The specific values ​​of A and B can be adaptively adjusted according to the difference in the selected target grayscale, which is not specifically limited in the embodiment of the present invention.

[0041] Optionally, when n is 63, middle is a non-integer, you can combine A to Correction is made, that is, the coefficient before the initial grayscale is used as a variable in equation (1) is changed to and A to confirm.

[0042] For example, 0.234<A<0.286, the significant figures of A can be determined based on testing and fitting accuracy, and the numerical accuracy of A can be determined to 2, 3, or 4 significant figures as needed. Other parameters are similar to A and can also be determined based on testing and fitting accuracy.

[0043] Exemplary, reference Figure 4 As shown, Figure 4 Two types of discrete points are shown in FIG. 1 , one is the target effective drive discrete points obtained at different initial grayscales when the target grayscale is zero (i.e., y=0). The other is the target effective drive discrete points obtained at different initial grayscales when the target grayscale is 63 (i.e., y=63). Figure 4 The figure also shows the corresponding fitting relationship when the target grayscale is different. One is the fitting curve corresponding to the initial grayscale and the theoretical effective drive when the target grayscale is zero (ie y = 0) (refer to Figure 4 One is the fitting curve s1 in the middle); the other is the fitting curve corresponding to the initial grayscale and the theoretical effective drive when the target grayscale is 63 (ie y = 63) (reference Figure 4 Fitting curve s2). Combined with Figure 4It can be seen that when the target grayscale is zero, the difference between the target effective drive and the theoretical effective drive is small. When the initial grayscale is 0, the difference between the target effective drive and the theoretical effective drive is equal to 5. When the initial grayscale is 1 to 63, the difference between the target effective drive and the theoretical effective drive is less than 5, and the preferred difference is less than 2 or 1. Similarly, when the target grayscale is 63, the difference between the target effective drive and the theoretical effective drive is small. When the initial grayscale is 0, the difference between the target effective drive and the theoretical effective drive is equal to 5. When the initial grayscale is 1 to 63, the difference between the target effective drive and the theoretical effective drive is less than 5, and the preferred difference is less than 2 or 1.

[0044] like Figure 4 As shown, when the target grayscale is zero and the initial grayscale is 1 to 63, the difference between the target effective drive and the theoretical effective drive is less than or equal to 2. When the target grayscale is 63 and the initial grayscale is 1 to 63, the difference between the target effective drive and the theoretical effective drive is less than or equal to 2.

[0045] The fitting curve s1 represents the effective driving value of each target when the target grayscale is zero (i.e. Figure 4 The fitting curve s2 represents the effective driving value of each target when the target grayscale is 63 (i.e. Figure 4 The law complies with (the various discrete points near the fitting curve s2 in the figure). It can be understood that, under the drive of the driving waveform, a grayscale test is performed on an electrophoretic display panel. According to the measured grayscale data of the electrophoretic display panel, when the target grayscale is a fixed value, a linear fit is performed, and the coefficient of the linear fitting line meets the scope of the embodiment of the present invention, that is, the coefficient of the linear fitting line meets: the slope is greater than 0.234 and less than 0.286. The intercept is greater than -20 and less than 10. And the difference between the corresponding measured effective drive value and the value on the linear fitting line does not exceed 5.

[0046] The fitting curve s1 and the fitting curve s2 are straight lines. The slopes of the fitting curve s1 and the fitting curve s2 are almost unchanged, or the slope of the fitting curve s1 changes very little compared to the slope of the fitting curve s2. Figure 4 The example in the figure shows the fitting conditions when the target grayscale is zero and the target grayscale is 63 in the 64 grayscale driving mode, but does not show the fitting conditions when the target grayscale is 1 to 62 in the 64 grayscale driving mode. Figure 4 It can be seen that the fitting curves for target grayscales from 1 to 62 are sequentially distributed between fitting curve s1 and fitting curve s2. When the target grayscale value changes, for example, from a target grayscale of 0 to a target grayscale of 63, the slope of the fitting curve remains almost unchanged, but the intercept of the fitting curve changes.

[0047] Figure 5 A schematic diagram of the relationship between an initial grayscale and an effective drive according to an embodiment of the present invention is provided. Figure 5 As shown, Figure 5 The value of the horizontal axis represents the target grayscale value, and the value of the vertical axis represents the effective driving value. Figure 5 Multiple discrete points are shown, and the effective drive corresponding to the discrete points is the target effective drive. The discrete points can be understood as points determined in the coordinate system by a target grayscale and a certain effective drive value when the initial grayscale is a fixed value. Figure 5 Two fitting curves are shown in ( Figure 5 s3 and s4 shown in the figure), the fitting curve is a relationship between the theoretical effective drive and the target grayscale when the initial grayscale is fixed. The effective drive obtained by substituting the target grayscale into the relationship is the theoretical effective drive. Where the difference between the target effective drive and the theoretical effective drive is less than or equal to 5, it can be understood that the effective drive obtained by the fitting curve is the same or similar to the actual target effective drive.

[0048] Exemplary, reference Figure 5 As shown, when the electrophoretic display panel is driven at 64 grayscales and the target grayscale is a fixed value, when the target grayscale is 0 (x=0), the difference between the target effective drive and the theoretical effective drive is less than or equal to 5; when the target grayscale is 5 (x=5), the difference between the target effective drive and the theoretical effective drive is less than or equal to 2; when the target grayscale takes other values, the difference between the target effective drive and the theoretical effective drive is less than or equal to 1.

[0049] When the initial grayscale is a fixed value, the target effective drive value corresponding to the target grayscale is stored in the driver chip. The electrophoretic display panel can directly obtain the discrete effective drive value by looking up the table in the driver chip, that is, directly looking up the table to obtain the target effective drive value, and then obtain the accurate driving waveform, and then adjust the grayscale according to the driving waveform, which can improve the speed and accuracy of the grayscale adjustment.

[0050] Specifically, Figure 5 The acquisition of discrete points and the fitting of the relationship under 64 grayscale driving of the electrophoretic display panel are used as an example. When the target grayscale is a fixed value, the fitted relationship satisfies: Relationship (2), Among them, x is the initial grayscale, y is the target grayscale, V l For theoretical effective driving, x and y are integers, -0.22<C<-0.10, 0<D<25. n is the number of gray levels of the electrophoretic display panel in a driving mode. For example, C can be -0.18. For example, the fitted relationship can be: V l = -0.2007x + 13.022 or V l=-0.1658x+11.037. The specific values ​​of C and D can be adaptively adjusted according to the difference in the selected initial grayscales, which is not specifically limited in the embodiment of the present invention.

[0051] Optionally, when n is 63, middle For non-integer, you can combine C to Correction is made, that is, the coefficient before the target grayscale is used as a variable in equation (2) is calculated by and C to determine.

[0052] For example, -0.216<C<-0.144, the significant figures of C can be determined according to the test and fitting accuracy, and the numerical accuracy of C can be determined to 2, 3 or 4 significant figures as needed.

[0053] Exemplary, reference Figure 5 As shown, Figure 5 Two types of coordinate points are shown in the figure, one is when the initial grayscale is zero (i.e., x=0), and the discrete points of the target effective drive are obtained at different target grayscales; the other is when the initial grayscale is 63 (i.e., x=63), and the discrete points of the target effective drive are obtained at different target grayscales. Figure 5 The figure also shows the corresponding fitting relationship when the target grayscale is different. One is when the initial grayscale is zero (ie x = 0), the target grayscale and the theoretical effective drive corresponding fitting curve (reference Figure 5 The first is the fitting curve s3 in the figure); the second is the fitting curve corresponding to the target grayscale and the theoretical effective drive when the initial grayscale is 63 (i.e., x=63) (refer to Figure 5 Fitting curve s4). Combined with Figure 5 It can be seen that when the initial grayscale is zero, the difference between the target effective drive and the theoretical effective drive is small. When the target grayscale is 0, the difference between the target effective drive and the theoretical effective drive is equal to 5. When the target grayscale is 1 to 63, the difference between the target effective drive and the theoretical effective drive is less than 5, and the preferred difference is less than 2 or 1. Similarly, when the initial grayscale is 63, the difference between the target effective drive and the theoretical effective drive is small. When the target grayscale is 0, the difference between the target effective drive and the theoretical effective drive is equal to 5. When the target grayscale is 1 to 63, the difference between the target effective drive and the theoretical effective drive is less than 5, and the preferred difference is less than 2 or 1.

[0054] like Figure 5 As shown, when the initial grayscale is zero and the target grayscale is 1 to 63, the difference between the target effective drive and the theoretical effective drive is less than or equal to 2. When the initial grayscale is 63 and the target grayscale is 1 to 63, the difference between the target effective drive and the theoretical effective drive is less than or equal to 2.

[0055] The fitting curve s3 represents the effective driving value of each target when the initial grayscale is zero (i.e. Figure 5 The fitting curve s4 represents the effective driving value of each target when the initial grayscale is 63 (i.e. Figure 5 The law complies with (the various discrete points near the fitting curve s4 in the figure). It can be understood that, under the drive of the driving waveform, a grayscale test is performed on an electrophoretic display panel. According to the measured grayscale data of the electrophoretic display panel, when the initial grayscale is a fixed value, a linear fit is performed, and the coefficient of the linear fitting line meets the scope of the embodiment of the present invention, that is, the coefficient of the linear fitting line meets: the slope is greater than -0.216 and less than -0.144. The intercept is greater than 0 and less than 25. And the difference between the corresponding measured effective drive value and the value on the linear fitting line does not exceed 5.

[0056] The fitting curve s3 and the fitting curve s4 are straight lines. The slopes of the fitting curve s3 and the fitting curve s4 are almost unchanged, or the slope of the fitting curve s3 changes very little compared to the slope of the fitting curve s4. Figure 5 The example in the figure shows the fitting conditions when the initial grayscale is 0 and the initial grayscale is 63 in the 64 grayscale driving mode, but does not show the fitting conditions when the initial grayscale is 1 to 62 in the 64 grayscale driving mode. Figure 5 It can be seen that the fitting curves for initial grayscale values ​​from 1 to 62 are sequentially distributed between fitting curve s3 and fitting curve s4. When the initial grayscale value changes, for example, from an initial grayscale of 0 to an initial grayscale of 63, the slope of the fitting curve remains almost unchanged, but the intercept of the fitting curve changes.

[0057] In the electrophoretic display panel provided by the embodiment of the present invention, the theoretical effective drive satisfies the relationship equation (1) and / or the relationship equation (2), the difference between the target effective drive and the theoretical effective drive is small, and the relationship equation satisfied by the theoretical effective drive can be used to describe the law satisfied by each numerical point of the target effective drive. The driving waveform determined according to the target effective drive is relatively accurate; on the other hand, during debugging, the value of the theoretical effective drive is obtained according to the relationship equation (1) and / or the relationship equation (2), and based on the value of the theoretical effective drive, a test is performed near the value of the theoretical effective drive, and a suitable effective drive value is found as the target effective drive. Compared with blind debugging without any basis, the speed and accuracy of grayscale adjustment are improved, and the difficulty of grayscale calibration during the test of the electrophoretic display panel can be reduced.

[0058] It should be noted that the initial grayscale x, target grayscale y and theoretical effective driving V lThe three can form a ternary equation, so the initial grayscale x and the target grayscale y are both variables, and the theoretical effective driving force V l According to the values ​​obtained from the two variables, compared with fixing one of the initial grayscale x and the target grayscale y, the theoretical effective drive V l The value obtained based on one variable has a larger error. Therefore, in the embodiment of the present invention, the target gray level y is fixed so that the theoretical effective driving voltage V l Satisfy the relationship (1); and / or, fix the initial grayscale x so that the theoretical effective drive V l Satisfies the relationship (2).

[0059] Optional, reference Figure 4 As shown, 0.24<A<0.28.

[0060] In equation (1), when the target grayscale is a fixed value, the theoretical effective drive satisfies: V l =Ax+B; and 0.23<A<0.29. Further, refer to Figure 4 As shown, when the target gray level is 0 (ie, y = 0), the relationship (1) (reference Figure 4 The fitting curve s1 in the figure, and the relationship (1) when the target grayscale is 63 (ie, y = 63) (refer to Figure 4 The slopes of the corresponding fitting curves are the same or similar. The corresponding equation (1) when the target grayscale is 0 and the corresponding equation (1) when the target grayscale is 63 can be understood as the upper and lower limits of the slope change of equation (1) when the electrophoretic display panel is driven at 64 grayscale. When the target grayscale is other values, the degree of change in the slope is smaller. Therefore, at different target grayscales, the slope values ​​in equation (1) are similar.

[0061] Furthermore, 0.247<A<0.273 can be selected.

[0062] Specifically, when the slope satisfies: 0.247<A<0.273, it can be understood that when the target grayscale is at different values, the slope of equation (1) remains almost unchanged, and its variation does not exceed 5%. In this way, the difference between the theoretical effective drive and the target effective drive can be kept small, so the theoretical effective drive used to determine the driving waveform is relatively accurate, and the driving waveform is accurate and reliable. The electrophoretic display panel adjusts the grayscale according to the driving waveform, thereby improving the speed and accuracy of grayscale adjustment, which can reduce the difficulty of grayscale calibration during the testing process of the electrophoretic display panel.

[0063] Optional, reference Figure 4 As shown, under 64 grayscale driving, when y=0, V l=0.2688x+B; wherein, 0.75≤B<10; and / or, under 64 grayscale driving, when y=63, V l =0.2798x+B; wherein, -20<B≤-10.581.

[0064] In equation (1), when the target grayscale is fixed, the theoretical effective drive satisfies: V l =Ax+B; and, -20<B<10. Under 64 grayscale driving, the target grayscale of zero and the target grayscale of 63 can be understood as the two upper and lower limits of equation (1) when the electrophoretic display panel is driven at 64 grayscale. By obtaining the intercepts of the upper and lower limits of the fitting curve, the numerical range of B in equation (1) can be more accurately determined, thereby ensuring that the difference between the theoretical effective drive and the target effective drive is small.

[0065] For further reference, Figure 4 As shown in relation (1), when the target grayscale is 0, that is, y = 0 (refer to Figure 5 The fitting curve s1) in the equation (1) satisfies: V l =0.2688x+B, that is, the slope A is selected as 0.2688. The corresponding intercept B satisfies: 0.75≤B<10. For example, B can be 5.75. When the target grayscale is 0, the intercept range of the relationship (1) is determined.

[0066] For further reference, Figure 4 As shown, for the relationship (1): when the target grayscale is 63, that is, y=63 (reference Figure 5 The fitting curve s2) in the equation (1) satisfies: V l =0.2798x+B, that is, the slope A is selected as 0.2798. The corresponding intercept B satisfies: -20<B≤-10.581. For example, B can be -15.375. When the target grayscale is 63, the intercept range of the relationship (1) is determined.

[0067] For further reference, Figure 4 As shown, the intercept of the relational expression (1) can be determined according to the target grayscale being 0 and the target grayscale being 63, and then B satisfies: -20<B<10.

[0068] Specifically, after determining the target grayscale value in relational expression (1), the corresponding slope can be determined. Furthermore, in order to ensure that the difference between relational expression (1) and the values ​​of multiple discrete points is small, that is, the difference between the target effective drive and the theoretical effective drive is small, the intercept can be limited to a range, thereby ensuring that the fitted relational expression (1) is more accurate and reliable, and the theoretical effective drive used to determine the driving waveform is relatively accurate, so the driving waveform is accurate and reliable; the electrophoretic display panel adjusts the grayscale according to the driving waveform, thereby improving the speed and accuracy of the grayscale adjustment, and reducing the difficulty of grayscale calibration during the test of the electrophoretic display panel.

[0069] Optional, reference Figure 5 As shown, under 64 grayscale driving, when x=0, V l =-0.2007y+13.022; and / or, under 64 grayscale driving, when x=63, V l =-0.1658y+11.037.

[0070] In equation (2), when the initial grayscale is fixed, the theoretical effective drive satisfies: V l =Cx+D. Under 64-grayscale driving, the initial grayscale of zero and the initial grayscale of 63 can be understood as the upper and lower limits of equation (2) when the electrophoretic display panel is driven at 64 grayscales. By obtaining the slope and intercept of the upper and lower limits of the fitting curve, equation (2) can be determined more accurately, thereby ensuring that the difference between the theoretical effective drive and the target effective drive is small.

[0071] For further reference, Figure 5 As shown, for the relation (2), when the initial grayscale is 0, that is, x=0, the relation (2) satisfies: V l =-0.2007y+13.022(reference Figure 5 The slope C of the fitting curve s3) is -0.2007. The corresponding intercept D is 13.022. When the initial grayscale is 0, the relationship (2) is determined.

[0072] For further reference, Figure 5 As shown, for the relation (2), when the initial grayscale is 63, that is, x=63, the relation (2) satisfies: V l =-0.1658y+11.037(reference Figure 5 The slope D of the fitting curve s4) is selected as -0.1658. The corresponding intercept D is selected as 11.037. When the initial grayscale is 63, the upper limit of the relationship (2) is determined.

[0073] For further reference, Figure 5As shown, for equation (2), the slope and intercept can be determined simultaneously when the initial grayscale is 0 and when the initial grayscale is 63, thereby ensuring that equation (2) is more accurate and reliable, thereby ensuring that the calculated theoretical effective drive is more accurate, and reducing the difficulty of grayscale calibration during the test of the electrophoretic display panel.

[0074] Optionally, under 16 grayscale driving, when the target grayscale is fixed, V l =Ex+F; wherein, 0.99<E<1.21, -20<F<10.

[0075] Furthermore, the acquisition of discrete points and the fitting of the relationship are described when the electrophoretic display panel is driven at 16 grayscales. When the target grayscale is a fixed value, the relationship obtained by fitting satisfies: V l =Ex+F; where x is the initial grayscale, y is the target grayscale, V l For theoretical effective drive, x and y are integers, 0.99<E<1.21, -20<F<10. For example, E can be 1.1, and the specific values ​​of E and F can be adaptively adjusted according to the difference in the selected target grayscale. Furthermore, when the target grayscale is a fixed value, the theoretical effective drive satisfies: On this basis, V l =Ex+F; wherein, 0.99<E<1.21, -20<F<10.

[0076] 1.0<E<1.2. Further, 1.045<E<1.155.

[0077] Optionally, under 16 grayscale driving, when the initial grayscale is fixed, V l =Gy+H; wherein, -0.9<G<-0.6, 0<H<25.

[0078] Furthermore, the acquisition of discrete points and the fitting of the relationship are described when the electrophoretic display panel is driven at 16 grayscales. When the initial grayscale is a fixed value, the relationship obtained by fitting satisfies: V l =Gy+H; where x is the initial grayscale, y is the target grayscale, V l For theoretical effective driving, x and y are integers, -0.9 < G < -0.6, 0 < H < 25. For example, G may be -0.75, and the specific values ​​of G and H may be adaptively adjusted according to needs.

[0079] Optional, Figure 6 Another schematic diagram of the relationship between the initial grayscale and the effective drive provided by the embodiment of the present invention is shown in FIG. Figure 6 As shown, under 16 grayscale driving, when x=0, V l=-0.6632y+11.037; and / or, under 16 grayscale driving, when x=15, V l =-0.8029y+13.022.

[0080] Figure 6 A schematic diagram of the relationship between an initial grayscale and an effective drive according to an embodiment of the present invention is provided. Figure 6 As shown, Figure 6 The value of the horizontal axis represents the target grayscale value, and the value of the vertical axis represents the effective driving value. Figure 6 Multiple discrete points are shown, and the effective drive corresponding to the discrete points is the target effective drive. The discrete points can be understood as points determined in the coordinate system by a target grayscale and a certain effective drive value when the initial grayscale is a fixed value. Figure 6 Two fitting curves are shown in ( Figure 6 The fitting curve is a relationship between the theoretical effective drive and the target grayscale when the initial grayscale is fixed. The effective drive obtained by substituting the target grayscale into the relationship is the theoretical effective drive. If the difference between the target effective drive and the theoretical effective drive is less than or equal to 5, it can be understood that the effective drive obtained by the fitting curve is the same or similar to the actual target effective drive.

[0081] Specifically, Figure 6 The acquisition of discrete points and the fitting of the relationship under 16 grayscale driving of the electrophoretic display panel are used as an example. It should be noted that the discrete points under 16 grayscale driving can be understood as some discrete points selected under 64 grayscale driving. The theoretical effective driving satisfies the following relationship: When the initial grayscale is fixed, n is the number of grayscales in a driving mode of the electrophoretic display panel. Therefore, in the case of 64 grayscale driving, n is selected as 64; in the case of 16 grayscale driving, n is selected as 16. The same electrophoretic display panel can be adjusted to either 64 grayscale driving or 16 grayscale driving. The specific value of n is adaptively adjusted according to actual needs. For example, when the electrophoretic display panel is driven in 16 grayscale, the fitted relationship can be: V l = -0.6632x + 11.037 or V l =-0.8029+13.022. The specific values ​​of C and D can be adaptively adjusted according to the difference in the selected initial grayscales, and this is not specifically limited in the embodiment of the present invention. For example, the slope under 64 grayscale driving is four times the slope under 16 grayscale driving, and the intercept under 64 grayscale driving is four times the intercept under 16 grayscale driving.

[0082] Exemplary, reference Figure 6 As shown, Figure 6Two types of coordinate points are shown in the figure, one is when the initial grayscale is zero (i.e., x=0), and the discrete points of the target effective drive are obtained at different target grayscales; the other is when the initial grayscale is 15 (i.e., x=15), and the discrete points of the target effective drive are obtained at different target grayscales. Figure 6 The figure also shows the corresponding fitting relationship when the target grayscale is different. One is when the initial grayscale is zero (ie x = 0), the target grayscale and the theoretical effective drive corresponding fitting curve (reference Figure 6 One is the fitting curve s5 in the figure); the other is the fitting curve corresponding to the target grayscale and the theoretical effective drive when the initial grayscale is 15 (i.e. x=15) (refer to Figure 6 Fitting curve s6). Combined with Figure 6 It can be seen that when the initial grayscale is zero, the difference between the target effective drive and the theoretical effective drive is small. When the target grayscale is 0, the difference between the target effective drive and the theoretical effective drive is equal to 5. When the target grayscale is 1 to 15, the difference between the target effective drive and the theoretical effective drive is less than 5. Similarly, when the initial grayscale is 15, the difference between the target effective drive and the theoretical effective drive is small. When the target grayscale is 0, the difference between the target effective drive and the theoretical effective drive is equal to 5. When the target grayscale is 1 to 15, the difference between the target effective drive and the theoretical effective drive is less than 5.

[0083] like Figure 6 As shown, when the initial grayscale is zero and the target grayscale is 1 to 15, the difference between the target effective drive and the theoretical effective drive is less than or equal to 2. When the initial grayscale is 15 and the target grayscale is 1 to 15, the difference between the target effective drive and the theoretical effective drive is less than or equal to 2.

[0084] The fitting curve s5 represents the effective driving value of each target when the initial grayscale is zero (i.e. Figure 6 The fitting curve s6 represents the effective driving value of each target when the initial grayscale is 15 (i.e. Figure 6 The law followed by each discrete point near the fitting curve s6).

[0085] The fitting curve s5 and the fitting curve s6 are straight lines. The slopes of the fitting curve s5 and the fitting curve s6 are almost unchanged, or the slope of the fitting curve s5 changes very little compared to the slope of the fitting curve s6. Figure 6 The example in the figure shows the fitting conditions when the initial grayscale is 0 and the initial grayscale is 15 in the 16-grayscale driving mode, but does not show the fitting conditions when the initial grayscale is 1 to 14 in the 16-grayscale driving mode. Figure 6It can be seen that the fitting curves for initial grayscale values ​​from 1 to 14 are sequentially distributed between fitting curve s5 and fitting curve s6. When the initial grayscale value changes, for example, from an initial grayscale of 0 to an initial grayscale of 15, the slope of the fitting curve remains almost unchanged, but the intercept of the fitting curve changes.

[0086] Furthermore, in equation (2), when the initial grayscale is fixed, the theoretical effective drive satisfies: V l =Cx+D. Under 16-grayscale driving, the initial grayscale of zero and the initial grayscale of 15 can be understood as the upper and lower limits of equation (2) when the electrophoretic display panel is driven at 16 grayscales. By obtaining the slope and intercept of the upper and lower limits of the fitting curve, equation (2) can be determined more accurately, thereby ensuring that the difference between the theoretical effective drive and the target effective drive is small.

[0087] For further reference, Figure 6 As shown, for the relation (2), when the initial grayscale is 0, that is, x=0, the relation (2) satisfies: V l =-0.6632y+11.037(reference Figure 6 The slope C of the fitting curve s5) is -0.6632. The corresponding intercept D is 11.037. When the initial grayscale is 0, the relationship (2) is determined.

[0088] For further reference, Figure 6 As shown, for the relation (2), when the initial grayscale is 15, that is, x=15, the relation (2) satisfies: V l =-0.8029y+13.022(reference Figure 6 The slope D of the fitting curve s6) is selected as -0.8029. The corresponding intercept D is selected as 13.022. When the initial grayscale is 150, the upper limit of the relationship (2) is determined.

[0089] For further reference, Figure 6 As shown, for equation (2), the slope and intercept can be determined simultaneously when the initial grayscale is 0 and when the initial grayscale is 15, thereby ensuring that equation (2) is more accurate and reliable, thereby ensuring that the calculated theoretical effective drive is more accurate, and reducing the difficulty of grayscale calibration during the test of the electrophoretic display panel.

[0090] Optional, reference Figure 3 As shown, V i In the i-th unit period t i The values ​​in include 0, 1 or -1, V i The unit is V0, V0 is a constant voltage, and the value of V0 is determined by the maximum driving voltage in the electrophoretic display panel.

[0091] The driving voltage of the data signal can be understood as the driving voltage in the driving waveform. For example, the driving voltage in the driving waveform can be 15V, 0, or -15V. That is, V0 = 15V. In the i-th unit period t i The unit driving voltage of the data signal is V i , and the unit driving voltage is V i is the normalized driving voltage, V i Includes any value of 0, 1 or -1. That is, in a certain unit time period t i Inside, V i It can be any value among 0, 1 or -1. The duration of unit period P0 is the duration of scanning frame. Figure 1 In a scanning frame, the first scanning line 23 is scanned to the last scanning line 23 row by row. That is, a unit period P0 is the repetition period of the row signal. The effective drive represents the accumulated value of the product of voltage and time.

[0092] For further reference, Figures 4 to 6 As shown, the effective drive unit is: (V (volt) × S (second)) / V i0 For example, when the driving voltage of the data signal is 15V, the effective driving unit is: (V (volt) × S (second)) / 15.

[0093] Figure 7 Another driving timing diagram of an electrophoretic display panel provided by an embodiment of the present invention is shown in FIG. Figure 8 Another driving timing diagram of an electrophoretic display panel provided by an embodiment of the present invention is shown in FIG. Figure 7 and Figure 8 As shown, the driving phase T of the electrophoretic display panel 10 includes a writing phase Ta and an activation phase Tb, wherein the activation phase Tb is located before the writing phase Ta; the activation phase Tb includes at least two sub-activation phases Tb1, and the driving voltage polarities of the data signals in at least two sub-activation phases Tb1 are opposite.

[0094] refer to Figure 7 and Figure 8 As shown, the driving phase T of the electrophoretic display panel 10 includes a writing phase Ta and an activation phase Tb. The writing phase Ta writes different data signals Source to at least two pixels 22. It will be understood that the writing phase Ta is used to perform a differentiation operation. By writing different data signals Source to at least two pixels 22 during the writing phase Ta, the electrophoretic display panel 10 can display an image. The activation phase Tb provides the same data signal Source to different pixels 22. The activation phase Tb is configured to activate the electrophoretic particles to prevent agglomeration of electrophoretic particles with different charges.

[0095] Optional, reference Figure 8 As shown, the driving phase T of the electrophoretic display panel 10 may also include an erasing phase Tc. In the erasing phase Tc, the same data signal Source is provided to different pixels 22, and different pixels 22 may have the same display brightness and the same grayscale. Driving the electrophoretic display panel 10 to a uniform optical limit (black grayscale or white grayscale) is beneficial for eliminating the residual image of the previous frame. Before the driving signal of the writing phase Ta arrives, the electrophoretic particles of each pixel 22 are in the same spatial position. Figure 8 As shown, Figure 8 A scanning signal, Gate, is output. The interval between two pulses in the scanning signal, Gate, comprises a unit period, P0. During a unit period, P0, the first scan line is scanned to the last scan line, row by row. It should be noted that if the pixel 22 remains in the same state for a long time, the mobility of the charged electrophoretic particles will increase, hindering the display in the next stage. The activity of the electrophoretic particles can be increased by driving the electrophoretic display panel multiple times to reach its optical limit.

[0096] Specifically, refer to Figure 7 As shown, the activation phase Tb includes at least two sub-activation phases Tb1, and the driving voltage polarities of the data signals in the at least two sub-activation phases Tb1 are opposite. Figure 7 The driving voltage polarity of the data signal in the sub-activation phase Tb1 which is relatively close to the writing phase Ta in terms of timing is negative. Figure 7 The driving voltage polarity of the data signal in the sub-activation phase Tb1 which is relatively far away from the writing phase Ta in terms of timing is positive.

[0097] The above-mentioned equations (1) and (2) are the cumulative values ​​of the voltage multiplied by the unit time in the writing phase Ta and the activation phase Tb. If only one sub-activation phase Tb1 is set, the effective drive brought by the single sub-activation phase Tb1 is in a single direction, and the numerical value of the effective drive is no longer applicable to equations (1) and (2). In this way, the number of sub-activation phases Tb1 is adjusted to at least two, ensuring that the numerical value of the effective drive satisfies equations (1) and (2), thereby ensuring that the difference between the theoretical effective drive and the target effective drive is small. Therefore, the theoretical effective drive used to determine the drive waveform is relatively accurate, thereby improving the speed and accuracy of grayscale adjustment and reducing the difficulty of grayscale calibration during the test of the electrophoretic display panel.

[0098] Continue to refer Figure 7As shown, the at least two sub-activation stages Tb1 include a first sub-activation stage Tb11 and a second sub-activation stage Tb12, and the driving voltages of the data signals in the first sub-activation stage Tb11 and the second sub-activation stage Tb12 are equal in value and opposite in phase; the duration of the first sub-activation stage Tb11 is equal to the duration of the second sub-activation stage Tb12.

[0099] Specifically, refer to Figure 7 As shown, the activation phase Tb includes at least two sub-activation phases Tb1, the two sub-activation phases Tb1 are the first sub-activation phase Tb11 and the second sub-activation phase Tb12, and the driving voltage polarities of the data signal in the first sub-activation phase Tb11 and the second sub-activation phase Tb12 are opposite. At the same time, the absolute values ​​of the driving voltages of the data signal in the first sub-activation phase Tb11 and the second sub-activation phase Tb12 are the same. It can be understood that the driving voltage of the data signal in the first sub-activation phase Tb11 is V0, and the driving voltage of the data signal in the second sub-activation phase Tb12 is -V0. Furthermore, the duration of the first sub-activation phase Tb11 is equal to the duration of the second sub-activation phase Tb12. Figure 3 and Figure 7 As shown, the first sub-activation phase Tb11 includes five unit time periods P0, and the second sub-activation phase Tb12 also includes five unit time periods P0, ensuring that the duration of sub-activation phase Tb11 is equal to the duration of the second sub-activation phase Tb12. The number of unit time periods P0 included in the first sub-activation phase Tb11 and the second sub-activation phase Tb12 can be adaptively adjusted according to different situations.

[0100] As mentioned above, in the i-th unit period t i The driving voltage of the data signal is V i0 ; Satisfy: V i0 =V i ×V0. During the total time period of the first sub-activation phase Tb11 plus the second sub-activation phase Tb12, the driving voltage of the data signal is zero. The accumulated value of the voltage during the writing phase Ta multiplied by the unit time satisfies the above-mentioned equations (1) and (2). In this way, the theoretical effective driving of the driving waveform is determined more accurately, thereby improving the speed and accuracy of grayscale adjustment.

[0101] Figure 9 Another driving timing diagram of an electrophoretic display panel provided by an embodiment of the present invention is shown in FIG. Figure 9As shown, the at least two sub-activation phases Tb1 include a first sub-activation phase Tb11 and a second sub-activation phase Tb12. The driving voltages of the data signal in the first sub-activation phase Tb11 and the second sub-activation phase Tb12 are equal and opposite in phase. The second sub-activation phase Tb12 is located between the first sub-activation phase Tb1 and the writing phase Ta. The voltage polarity of the second sub-activation phase Tb12 is the same as that of the writing phase Ta. In the writing phase Ta, the data signal includes a writing driving signal and a DC balance signal. The duration of the second sub-activation phase Tb12 minus the duration of the first sub-activation phase Tb11 is the duration difference Td, and the duration of the DC balance signal is equal to the duration difference.

[0102] Specifically, refer to Figure 9 As shown, the activation phase Tb includes at least two sub-activation phases Tb1, the two sub-activation phases Tb1 are the first sub-activation phase Tb11 and the second sub-activation phase Tb12, and the driving voltage polarities of the data signal in the first sub-activation phase Tb11 and the second sub-activation phase Tb12 are opposite. At the same time, the absolute values ​​of the driving voltages of the data signal in the first sub-activation phase Tb11 and the second sub-activation phase Tb12 are the same. It can be understood that the driving voltage of the data signal in the first sub-activation phase Tb11 is V0, and the driving voltage of the data signal in the second sub-activation phase Tb12 is -V0. Furthermore, the duration of the first sub-activation phase Tb11 is not equal to the duration of the second sub-activation phase Tb12. Figure 3 and Figure 9 As shown, the first sub-activation phase Tb11 includes 5 unit periods P0, and the second sub-activation phase Tb12 also includes 6 unit periods P0. The number of unit periods P0 included in the first sub-activation phase Tb11 and the second sub-activation phase Tb12 can be adaptively adjusted according to different situations. The duration difference Td is the duration of the second sub-activation phase Tb12 minus the duration of the first sub-activation phase Tb11. Figure 9 The duration of the second sub-activation phase Tb12 minus the duration of the first sub-activation phase Tb11 is a duration difference of one unit period P0.

[0103] Furthermore, in the write phase Ta, the data signal includes a write drive signal and a DC balance signal, wherein the input of the DC balance signal is to ensure DC balance. DC balance can be understood as the balance of the DC signal, that is, the integral of the applied voltage with respect to time is zero. The duration of the second sub-activation phase Tb12 minus the duration of the first sub-activation phase Tb11 is the duration difference Td, reference Figure 9As shown, the duration of the DC balance signal is equal to the duration difference Td. This can be understood as the difference between the duration of the first sub-activation phase Tb11 and the duration of the second sub-activation phase Tb12. Therefore, the effective driving force of the activation waveform in the first sub-activation phase Tb11 and the activation waveform in the second sub-activation phase Tb12 is not zero. This difference is compensated in the driving waveform of the writing phase Ta.

[0104] Figure 10 A schematic cross-sectional view of another electrophoretic display panel provided by an embodiment of the present invention is shown. Figure 11 A schematic cross-sectional view of another electrophoretic display panel provided by an embodiment of the present invention, referring to Figure 1 、 Figure 2 、 Figure 10 and Figure 11 As shown, the electrophoretic display panel 10 further includes a first substrate 11 , an electrophoretic fluid 14 and a plurality of electrophoretic particles 13 . The data lines 21 and the pixels 22 are located on the same side of the first substrate 11 facing the electrophoretic particles 13 . The electrophoretic particles 13 are charged particles doped in the electrophoretic fluid 14 .

[0105] Specifically, refer to Figure 2 、 Figure 10 and Figure 11 As shown, the electrophoretic display panel 10 includes a first substrate 11, an electrophoretic liquid 14 and a plurality of electrophoretic particles 13. The electrophoretic display panel 10 also includes a second substrate 12. The electrophoretic liquid 14 is located in a space formed by the first substrate 11 and the second substrate 12. The electrophoretic particles 13 are doped in the electrophoretic liquid 14. The electrophoretic display panel 10 also includes a first electrode (not shown in the figure) located on the side of the first substrate 11 facing the second substrate 12, and a second electrode (not shown in the figure) located on the side of the second substrate 12 facing the first substrate 11. By applying a voltage between the first electrode and the second electrode, thereby driving the electrophoretic particles 14 to move their positions, it is possible to achieve different display images for the pixels 22. Further, according to the color diversity of the electrophoretic liquid 14 and the electrophoretic particles 13, it is possible to achieve a color display effect for the pixels 22.

[0106] Specifically, there are various ways to set up the electrophoretic particles, as described below:

[0107] refer to Figure 2 As shown, the plurality of electrophoretic particles 13 include a first electrophoretic particle 131 and a second electrophoretic particle 132 , and the first electrophoretic particle 131 and the second electrophoretic particle 132 have different colors.

[0108] The electrophoretic particles 13 include a first electrophoretic particle 131 and a second electrophoretic particle 132, and the first electrophoretic particle 131 and the second electrophoretic particle 132 have different extensions, and the electrophoretic display panel 10 is a dual-particle system. Exemplarily, the electrophoretic particles 13 may include black electrophoretic particles and white electrophoretic particles, and the electrophoretic liquid 14 may be a colorless and transparent liquid. Under the action of the electric field provided by the first electrode and the second electrode, when the black electrophoretic particles are located on the display side of the electrophoretic display panel (for example, the side of the second substrate 12 away from the first substrate 11), the light is absorbed by the black electrophoretic particles, so that less light is reflected to the human eye, and it appears as a dark area to the human eye, for example, the grayscale value is recorded as 0. When the white electrophoretic particles are located on the display side of the electrophoretic display panel, the light is reflected by the white electrophoretic particles, so that more light is reflected to the human eye, and it appears as a bright area to the human eye, for example, the grayscale value is recorded as 63 or 15. When the black electrophoretic particles and the white electrophoretic particles are located between the second substrate 12 and the first substrate 11 , part of the light is reflected and part of the light is absorbed, which appears as a gray area to the human eye, with a grayscale value between 0 and 64, or between 0 and 15.

[0109] refer to Figure 10 As shown, the electrophoretic fluid 14 and the electrophoretic particles 13 have different colors.

[0110] The electrophoretic liquid 14 and the electrophoretic particles 13 may both be colored, and the colors of the electrophoretic liquid 14 and the electrophoretic particles 13 are different. Figure 10 As shown, the electrophoretic liquid 14 is a black liquid, and the electrophoretic particles 133 are white electrophoretic particles. The voltage between the first electrode and the second electrode drives the white charged particles doped in the black electrophoretic liquid to make each pixel display the desired grayscale. Specifically, when the white electrophoretic particles are located on the non-display side of the electrophoretic display panel (for example, the side of the second substrate 12 close to the first substrate 11), the light is absorbed by the black electrophoretic liquid, so that less light is reflected to the human eye, and it appears as a dark area to the human eye. When the white electrophoretic particles are located on the display side of the electrophoretic display panel, the light is reflected by the white electrophoretic particles, so that more light is reflected to the human eye, and it appears as a bright area to the human eye.

[0111] Optionally, refer to Figure 11 The electrophoretic particles 13 included in the electrophoretic display panel 10 shown are white particles. The electrophoretic display panel 10 also includes a black base 15 close to the side of the first substrate 11. The electrophoretic particles 13 can be doped in a colorless and transparent electrophoretic liquid 14. When the white particles are brought together by the electric field, the liquid is transparent and the black base can be seen, which appears as a dark area to the human eye. When the white particles are dispersed in the electrophoretic liquid by the electric field, the white particles are evenly displayed, which appears as a bright area to the human eye.

[0112] Based on the same inventive concept, an embodiment of the present invention further provides a display device. Figure 12 A schematic diagram of a top view of a display device according to an embodiment of the present invention is provided. Figure 12 The display device 1 includes the electrophoretic display panel 10 provided in the above embodiment. Therefore, the display device also has the beneficial effects of the electrophoretic display panel in the above embodiment. The similarities can be understood by referring to the above explanation of the electrophoretic display panel, which will not be repeated below.

[0113] The display device 1 provided by the embodiment of the present invention can be Figure 12 The electronic paper shown can also be any electronic product with a display function, including but not limited to the following categories: mobile phones, televisions, laptops, desktop monitors, tablet computers, digital cameras, smart bracelets, smart glasses, car displays, industrial control equipment, medical display screens, touch interactive terminals, etc. The embodiments of the present invention do not specifically limit this.

[0114] Based on the same inventive concept, an embodiment of the present invention further provides a driving method for an electrophoretic display panel. Figure 13 This is a flowchart of a driving method of an electrophoretic display panel according to an embodiment of the present invention. Figure 13 , the driving method includes:

[0115] S110 , obtaining an initial grayscale and a target grayscale.

[0116] The electrophoretic display panel includes data lines and pixels. The data lines are configured to transmit data signals to the pixels. Furthermore, the electrophoretic display panel also includes scan lines, which are configured to transmit scan signals to the pixels. The scan signals are signals that control the conduction of thin-film transistors. When the thin-film transistors are turned on, the data signals are written to the pixels. By writing different data signals to different pixels, the electrophoretic display panel can display specific images.

[0117] The data signal Source includes multiple unit time periods. The duration of the enable level of the data signal Source is an integer multiple of the unit time period. In the driving stage of the electrophoretic display panel, multiple data lines write different data signals Source for different pixels, so that different pixels can have different display brightness and different pixels can have different grayscales. Due to the influence of different parameters, the grayscale of the pixel of the electrophoretic display panel is not linearly related to the driving duration, so it is difficult to adjust the grayscale according to the display requirements. For example, the parameters can be the temperature factor of the electrophoretic display panel and the display influence of the previous picture, etc., and the embodiment of the present invention does not specifically limit this.

[0118] In the driving phase, in the i-th unit period t iThe unit driving voltage of the data signal Source is V i , the target effective drive is V m , then the target effective drive is: V m =∑V i t i , where i is a positive integer. i The time length of the unit period is equal to the time length of the unit period. In one embodiment, the time length of the unit period is the time length of the scanning frame. In a scanning frame, the first scanning line is scanned to the last scanning line line by line. The unit driving voltage is V i is the normalized driving voltage. The i-th unit driving voltage is V i The voltage value is 1V. The target effective drive is V m It represents the cumulative value of the product of voltage and time. The target effective drive can be understood as the value of the effective drive actually applied.

[0119] The initial grayscale is the grayscale value corresponding to the start time of the current image, that is, the grayscale value corresponding to the end time of the previous image, and the target grayscale is the preset grayscale value.

[0120] S120 , obtaining a theoretical effective drive according to the initial grayscale and the target grayscale, and equation (1) and / or equation (2).

[0121] Corresponding reference Figure 4 and Figure 5 As shown, Figure 4 A schematic diagram of the relationship between an initial grayscale and an effective drive according to an embodiment of the present invention is provided. Figure 4 As shown, Figure 4 The value of the horizontal axis represents the value of the initial grayscale, and the value of the vertical axis represents the value of the effective drive. The effective drive includes the target effective drive and the theoretical effective drive. Figure 4 A plurality of discrete points are shown, and the effective driving corresponding to the discrete points is the target effective driving. The discrete points can be understood as points determined in the coordinate system by a certain initial grayscale and a certain effective driving value when the target grayscale is a fixed value. Figure 4 Two fitting curves are shown in ( Figure 4s1 and s2 shown in the figure), the fitting curve is a relationship between the theoretical effective drive and the initial grayscale as variables when the target grayscale is a fixed value. The effective drive obtained by substituting the initial grayscale into the relationship is the theoretical effective drive. Among them, the difference between the target effective drive and the theoretical effective drive is less than or equal to 5, which can be understood as the effective drive obtained by the fitting curve and the actual target effective drive are the same or similar. Optionally, the difference between the target effective drive and the theoretical effective drive is less than or equal to 2. Further, the difference between the target effective drive and the theoretical effective drive is less than or equal to 1. For example, reference Figure 4 As shown, when the electrophoretic display panel is driven at 64 grayscales and the target grayscale is a fixed value, when the initial grayscale is 0 (y=0), the difference between the target effective drive and the theoretical effective drive is less than or equal to 5; when the initial grayscale is 5 to 8 (y=5, y=6, y=7 or y=8), the difference between the target effective drive and the theoretical effective drive is less than or equal to 2; when the initial grayscale takes other values, the difference between the target effective drive and the theoretical effective drive is less than or equal to 1.

[0122] When the target grayscale is a fixed value, the target effective drive value corresponding to the initial grayscale is stored in the driver chip. The electrophoretic display panel can directly obtain the discrete effective drive value by looking up the table in the driver chip, that is, directly looking up the table to obtain the target effective drive value, and then obtain the accurate driving waveform, and then adjust the grayscale according to the driving waveform, which can improve the speed and accuracy of the grayscale adjustment.

[0123] Specifically, Figure 4 The acquisition of discrete points and the fitting of the relationship under 64 grayscale driving of the electrophoretic display panel are used as an example. When the target grayscale is a fixed value, the fitted relationship satisfies: Relationship (1), Among them, x is the initial grayscale, y is the target grayscale, V l For theoretical effective drive, x and y are integers, 0.23<A<0.29, -20<B<10. n is the number of grayscales of the electrophoretic display panel in a driving mode. In the current embodiment, n is the number of grayscales of the electrophoretic display panel in a 64-grayscale driving mode, and n is equal to 64. In other embodiments, n can take other positive integer values. The present invention does not limit the value of n, which can be an odd number or an even number. For example, A can be 0.26. Exemplarily, the relationship obtained by fitting can be: V l =0.2688x+5.75 or V l =0.2688x-15.375. The specific values ​​of A and B can be adaptively adjusted according to the difference in the selected target grayscale, and the embodiment of the present invention does not specifically limit this. Optionally, when n is 63, middle is a non-integer, you can combine A to Correction is made, that is, the coefficient before the initial grayscale is used as a variable in equation (1) is changed to and A to confirm.

[0124] For example, 0.234<A<0.286, the significant figures of A can be determined based on the test and fitting accuracy, and the numerical accuracy of A can be determined to 2, 3 or 4 significant figures as needed. Other parameters are similar to A and can also be determined based on the test and fitting accuracy. For example, refer to Figure 4 As shown, Figure 4 Two types of discrete points are shown in FIG. 1 , one is the target effective drive discrete points obtained at different initial grayscales when the target grayscale is zero (i.e., y=0). The other is the target effective drive discrete points obtained at different initial grayscales when the target grayscale is 63 (i.e., y=63). Figure 4 The figure also shows the corresponding fitting relationship when the target grayscale is different. One is the fitting curve corresponding to the initial grayscale and the theoretical effective drive when the target grayscale is zero (ie y = 0) (refer to Figure 4 One is the fitting curve s1 in the middle); the other is the fitting curve corresponding to the initial grayscale and the theoretical effective drive when the target grayscale is 63 (ie y = 63) (reference Figure 4 Fitting curve s2). Combined with Figure 4 It can be seen that when the target grayscale is zero, the difference between the target effective drive and the theoretical effective drive is small. When the initial grayscale is 0, the difference between the target effective drive and the theoretical effective drive is equal to 5. When the initial grayscale is 1 to 63, the difference between the target effective drive and the theoretical effective drive is less than 5, and the preferred difference is less than 2 or 1. Similarly, when the target grayscale is 63, the difference between the target effective drive and the theoretical effective drive is small. When the initial grayscale is 0, the difference between the target effective drive and the theoretical effective drive is equal to 5. When the initial grayscale is 1 to 63, the difference between the target effective drive and the theoretical effective drive is less than 5, and the preferred difference is less than 2 or 1.

[0125] like Figure 4 As shown, when the target grayscale is zero and the initial grayscale is 1 to 63, the difference between the target effective drive and the theoretical effective drive is less than or equal to 2. When the target grayscale is 63 and the initial grayscale is 1 to 63, the difference between the target effective drive and the theoretical effective drive is less than or equal to 2.

[0126] The fitting curve s1 represents the effective driving value of each target when the target grayscale is zero (i.e. Figure 4 The fitting curve s2 represents the effective driving value of each target when the target grayscale is 63 (i.e. Figure 4The law complies with (the various discrete points near the fitting curve s2 in the figure). It can be understood that, under the drive of the driving waveform, a grayscale test is performed on an electrophoretic display panel. According to the measured grayscale data of the electrophoretic display panel, when the target grayscale is a fixed value, a linear fit is performed, and the coefficient of the linear fitting line meets the scope of the embodiment of the present invention, that is, the coefficient of the linear fitting line meets: the slope is greater than 0.234 and less than 0.286. The intercept is greater than -20 and less than 10. And the difference between the corresponding measured effective drive value and the value on the linear fitting line does not exceed 5.

[0127] The fitting curve s1 and the fitting curve s2 are straight lines. The slopes of the fitting curve s1 and the fitting curve s2 are almost unchanged, or the slope of the fitting curve s1 changes very little compared to the slope of the fitting curve s2. Figure 4 The example in the figure shows the fitting conditions when the target grayscale is zero and the target grayscale is 63 in the 64 grayscale driving mode, but does not show the fitting conditions when the target grayscale is 1 to 62 in the 64 grayscale driving mode. Figure 4 It can be seen that the fitting curves for target grayscales from 1 to 62 are sequentially distributed between fitting curve s1 and fitting curve s2. When the target grayscale value changes, for example, from a target grayscale of 0 to a target grayscale of 63, the slope of the fitting curve remains almost unchanged, but the intercept of the fitting curve changes.

[0128] Figure 5 A schematic diagram of the relationship between an initial grayscale and an effective drive according to an embodiment of the present invention is provided. Figure 5 As shown, Figure 5 The value of the horizontal axis represents the target grayscale value, and the value of the vertical axis represents the effective driving value. Figure 5 Multiple discrete points are shown, and the effective drive corresponding to the discrete points is the target effective drive. The discrete points can be understood as points determined in the coordinate system by a target grayscale and a certain effective drive value when the initial grayscale is a fixed value. Figure 5 Two fitting curves are shown in ( Figure 5 s3 and s4 shown in the figure), the fitting curve is a relationship between the theoretical effective drive and the target grayscale as variables when the initial grayscale is a fixed value. The effective drive obtained by substituting the target grayscale into the relationship is the theoretical effective drive. Among them, the difference between the target effective drive and the theoretical effective drive is less than or equal to 5, which can be understood as the effective drive obtained by the fitting curve and the actual target effective drive are the same or similar. For example, refer to Figure 5As shown, when the electrophoretic display panel is driven at 64 grayscales and the target grayscale is a fixed value, when the target grayscale is 0 (x=0), the difference between the target effective drive and the theoretical effective drive is less than or equal to 5; when the target grayscale is 5 (x=5), the difference between the target effective drive and the theoretical effective drive is less than or equal to 2; when the target grayscale takes other values, the difference between the target effective drive and the theoretical effective drive is less than or equal to 1.

[0129] When the initial grayscale is a fixed value, the target effective drive value corresponding to the target grayscale is stored in the driver chip. The electrophoretic display panel can directly obtain the discrete effective drive value by looking up the table in the driver chip, that is, directly looking up the table to obtain the target effective drive value, and then obtain the accurate driving waveform, and then adjust the grayscale according to the driving waveform, which can improve the speed and accuracy of the grayscale adjustment.

[0130] Specifically, Figure 5 The acquisition of discrete points and the fitting of the relationship under 64 grayscale driving of the electrophoretic display panel are used as an example. When the target grayscale is a fixed value, the fitted relationship satisfies: Relationship (2), Among them, x is the initial grayscale, y is the target grayscale, V l For theoretical effective driving, x and y are integers, -0.22<C<-0.10, 0<D<25. n is the number of gray levels of the electrophoretic display panel in a driving mode. For example, C can be -0.18. For example, the fitted relationship can be: V l = -0.2007x + 13.022 or V l =-0.1658x+11.037. The specific values ​​of C and D can be adaptively adjusted according to the difference in the selected initial grayscales, which is not specifically limited in the embodiment of the present invention.

[0131] Optionally, when n is 63, middle For non-integer, you can combine C to Correction is made, that is, the coefficient before the target grayscale is used as a variable in equation (2) is calculated by and C to determine.

[0132] For example, -0.216<C<-0.144, the significant figures of C can be determined according to the test and fitting accuracy, and the numerical accuracy of C can be determined to 2, 3 or 4 significant figures as needed.

[0133] Exemplary, reference Figure 5 As shown, Figure 5Two types of coordinate points are shown in the figure, one is when the initial grayscale is zero (i.e., x=0), and the discrete points of the target effective drive are obtained at different target grayscales; the other is when the initial grayscale is 63 (i.e., x=63), and the discrete points of the target effective drive are obtained at different target grayscales. Figure 5 The figure also shows the corresponding fitting relationship when the target grayscale is different. One is when the initial grayscale is zero (ie x = 0), the target grayscale and the theoretical effective drive corresponding fitting curve (reference Figure 5 The first is the fitting curve s3 in the figure); the second is the fitting curve corresponding to the target grayscale and the theoretical effective drive when the initial grayscale is 63 (i.e., x=63) (refer to Figure 5 Fitting curve s4). Combined with Figure 5 It can be seen that when the initial grayscale is zero, the difference between the target effective drive and the theoretical effective drive is small. When the target grayscale is 0, the difference between the target effective drive and the theoretical effective drive is equal to 5. When the target grayscale is 1 to 63, the difference between the target effective drive and the theoretical effective drive is less than 5, and the preferred difference is less than 2 or 1. Similarly, when the initial grayscale is 63, the difference between the target effective drive and the theoretical effective drive is small. When the target grayscale is 0, the difference between the target effective drive and the theoretical effective drive is equal to 5. When the target grayscale is 1 to 63, the difference between the target effective drive and the theoretical effective drive is less than 5, and the preferred difference is less than 2 or 1.

[0134] like Figure 5 As shown, when the initial grayscale is zero and the target grayscale is 1 to 63, the difference between the target effective drive and the theoretical effective drive is less than or equal to 2. When the initial grayscale is 63 and the target grayscale is 1 to 63, the difference between the target effective drive and the theoretical effective drive is less than or equal to 2.

[0135] The fitting curve s3 represents the effective driving value of each target when the initial grayscale is zero (i.e. Figure 5 The fitting curve s4 represents the effective driving value of each target when the initial grayscale is 63 (i.e. Figure 5 The law complies with (the various discrete points near the fitting curve s4 in the figure). It can be understood that, under the drive of the driving waveform, a grayscale test is performed on an electrophoretic display panel. According to the measured grayscale data of the electrophoretic display panel, when the initial grayscale is a fixed value, a linear fit is performed, and the coefficient of the linear fitting line meets the scope of the embodiment of the present invention, that is, the coefficient of the linear fitting line meets: the slope is greater than -0.216 and less than -0.144. The intercept is greater than 0 and less than 25. And the difference between the corresponding measured effective drive value and the value on the linear fitting line does not exceed 5.

[0136] The fitting curve s3 and the fitting curve s4 are straight lines. The slopes of the fitting curve s3 and the fitting curve s4 are almost unchanged, or the slope of the fitting curve s3 changes very little compared to the slope of the fitting curve s4. Figure 5 The example in the figure shows the fitting conditions when the initial grayscale is 0 and the initial grayscale is 63 in the 64 grayscale driving mode, but does not show the fitting conditions when the initial grayscale is 1 to 62 in the 64 grayscale driving mode. Figure 5 It can be seen that the fitting curves for initial grayscale values ​​from 1 to 62 are sequentially distributed between fitting curve s3 and fitting curve s4. When the initial grayscale value changes, for example, from an initial grayscale of 0 to an initial grayscale of 63, the slope of the fitting curve remains almost unchanged, but the intercept of the fitting curve changes.

[0137] S130: Obtain target effective driving according to theoretical effective driving.

[0138] The difference between the target effective drive and the theoretical effective drive is small, so the theoretical effective drive used to determine the driving waveform is relatively accurate, and therefore the driving waveform is accurate and reliable.

[0139] In the electrophoretic display panel provided by the embodiment of the present invention, the theoretical effective drive satisfies the relationship equation (1) and / or the relationship equation (2), the difference between the target effective drive and the theoretical effective drive is small, and the relationship equation satisfied by the theoretical effective drive can be used to describe the law satisfied by each numerical point of the target effective drive. The driving waveform determined according to the target effective drive is relatively accurate; on the other hand, during debugging, the value of the theoretical effective drive is obtained according to the relationship equation (1) and / or the relationship equation (2), and based on the value of the theoretical effective drive, a test is performed near the value of the theoretical effective drive, and a suitable effective drive value is found as the target effective drive. Compared with blind debugging without any basis, the speed and accuracy of grayscale adjustment are improved, and the difficulty of grayscale calibration during the test of the electrophoretic display panel can be reduced.

[0140] It should be noted that the initial grayscale x, target grayscale y and theoretical effective driving V l The three can form a ternary equation, so the initial grayscale x and the target grayscale y are both variables, and the theoretical effective driving force V l According to the values ​​obtained from the two variables, compared with fixing one of the initial grayscale x and the target grayscale y, the theoretical effective drive V l The value obtained based on one variable has a larger error. Therefore, in the embodiment of the present invention, the target gray level y is fixed so that the theoretical effective driving voltage V l Satisfy the relationship (1); and / or, fix the initial grayscale x so that the theoretical effective drive V l Satisfies the relationship (2).

[0141] Figure 14 This is a flowchart of another driving method of an electrophoretic display panel according to an embodiment of the present invention. Figure 14 As shown, the driving method further includes:

[0142] S210: Acquire an initial grayscale and a target grayscale.

[0143] S220 , obtaining a theoretical effective drive according to the initial grayscale and the target grayscale, and equation (1) and / or equation (2).

[0144] S230 : Taking the theoretical effective driving as the current effective driving, and obtaining the current brightness of the electrophoretic display panel.

[0145] When the target grayscale is a fixed value, the fitted relationship satisfies: Relationship (1), Among them, x is the initial grayscale, y is the target grayscale, V l is a theoretically effective drive; when the target grayscale is a fixed value, the fitted relationship satisfies: Relationship (2), The effective drive obtained by equation (1) and / or equation (2) is the theoretical effective drive. During the test, the electrophoretic display panel is driven by the driving waveform corresponding to the theoretical effective drive to obtain the current brightness of the electrophoretic display panel.

[0146] S240: Determine whether a deviation between the current brightness and the target brightness at the target grayscale is less than or equal to a preset value.

[0147] Furthermore, determining the deviation between the current brightness and the target brightness at the target grayscale can be understood as determining the difference between the theoretical effective drive and the target effective drive. The preset value can be set differently according to different electrophoretic display panels.

[0148] S250 : When the deviation value is greater than the preset value, correct the current effective drive according to the deviation value until the deviation value is less than or equal to the preset value, and use the current effective drive as the target effective drive.

[0149] Among them, when the deviation value is greater than the preset value, it proves that the difference between the theoretical effective drive obtained by the relationship and the target effective drive is large, and the current effective drive can be corrected according to the deviation value, that is, the theoretical effective drive is corrected, thereby ensuring that the difference between the target effective drive and the theoretical effective drive is small. Therefore, the theoretical effective drive used to determine the drive waveform is relatively accurate, and therefore the drive waveform is accurate and reliable.

[0150] After correcting the current effective drive based on the deviation value, the deviation value is compared with the preset value. If the deviation value is still greater than the preset value, the current effective drive is further corrected based on the deviation value. If the deviation value is less than or equal to the preset value, the current effective drive is used as the target effective drive, ensuring that the difference between the target effective drive and the theoretical effective drive is small, thereby determining the theoretical effective drive of the driving waveform. Electrophoretic display panels adjust grayscale based on the driving waveform, thereby improving the speed and accuracy of grayscale adjustment and reducing the difficulty of grayscale calibration during electrophoretic display panel testing.

[0151] S260: Establish a correspondence table among the initial grayscale, the target grayscale, and the target effective driving.

[0152] By establishing a corresponding relationship table for the correspondence between the initial grayscale, target grayscale and target effective drive, and storing the relationship table in the driver chip, the electrophoretic display panel can directly obtain the discrete effective drive value by looking up the table in the driver chip, that is, directly looking up the table to obtain the target effective drive value, and then obtain an accurate driving waveform, and then adjust the grayscale according to the driving waveform, which can improve the speed and accuracy of grayscale adjustment.

[0153] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations, and substitutions are possible for those skilled in the art without departing from the scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. An electrophoretic display panel, characterized in that: The method comprises a data line and a pixel, wherein the data line is configured to transmit a data signal to the pixel, and the data signal comprises a plurality of unit time periods; In the driving phase of the electrophoretic display panel, in the i-th unit period t i The unit driving voltage of the data signal is V i ; The target effective drive is V m , V m =∑V i t i , where i is a positive integer; Theoretically, effective driving satisfies at least one of the following relationships: Relation (1), when the target grayscale is fixed, Wherein, x is the initial grayscale, y is the target grayscale, V l is the theoretical effective drive, x and y are integers, 0.23<A<0.29, -20<B<10; n is the number of gray levels of the electrophoretic display panel in a driving mode; Relationship (2), when the initial grayscale is fixed, Among them, -0.22<C<-0.10, 0<D<25; The difference between the target effective driving force and the theoretical effective driving force is less than or equal to 5.

2. The electrophoretic display panel according to claim 1, characterized in that: 0.24＜A＜0.28。 3. The electrophoretic display panel according to claim 2, characterized in that: Under 64 grayscale driving, when y=0, V l =0.2688x+B; where 0.75≤B<10; and / or, Under 64 grayscale driving, when y=63, V l =0.2798x+B; wherein, -20<B≤-10.

581.

4. The electrophoretic display panel according to claim 1, characterized in that: Under 64 grayscale driving, when x=0, V l =-0.2007y+13.022; And / or, under 64 grayscale driving, when x=63, V l =-0.1658y+11.

037.

5. The electrophoretic display panel according to claim 1, characterized in that: Under 16 grayscale driving, when the target grayscale is fixed, V l =Ex+F; wherein, 0.99<E<1.21, -20<F<10.

6. The electrophoretic display panel according to claim 5, characterized in that: 1.0＜E＜1.2。 7. The electrophoretic display panel according to claim 1, characterized in that: Under 16 grayscale driving, when the initial grayscale is fixed, V l =Gy+H; wherein, -0.9<G<-0.6, 0<H<25.

8. The electrophoretic display panel according to claim 7, characterized in that: Under 16 grayscale driving, when x=0, V l =-0.6632y+11.037; And / or, under 16 grayscale driving, when x=15, V l =-0.8029y+13.

022.

9. The electrophoretic display panel according to claim 1, characterized in that: V i In the i-th unit period t i The values ​​in include 0, 1 or -1, V i The unit is V0, where V0 is a constant voltage.

10. The electrophoretic display panel according to claim 1, characterized in that: The driving stage of the electrophoretic display panel includes a writing stage and an activation stage, and the activation stage is located before the writing stage; The activation phase includes at least two sub-activation phases, and the driving voltage polarities of the data signal in at least two of the sub-activation phases are opposite.

11. The electrophoretic display panel according to claim 10, characterized in that: The at least two sub-activation phases include a first sub-activation phase and a second sub-activation phase, and the driving voltages of the data signal in the first sub-activation phase and the second sub-activation phase are equal in value and opposite in phase; The duration of the first sub-activation phase is equal to the duration of the second sub-activation phase.

12. The electrophoretic display panel according to claim 10, characterized in that: The at least two sub-activation phases include a first sub-activation phase and a second sub-activation phase, the driving voltages of the data signal in the first sub-activation phase and the second sub-activation phase are equal and opposite in phase, the second sub-activation phase is located between the first sub-activation phase and the writing phase, and the voltage polarity of the second sub-activation phase is the same as that of the writing phase; In the writing phase, the data signal includes a writing drive signal and a DC balance signal, the duration of the second sub-activation phase minus the duration of the first sub-activation phase is a duration difference, and the duration of the DC balance signal is equal to the duration difference.

13. The electrophoretic display panel according to claim 1, characterized in that: It also includes a first substrate, an electrophoretic liquid and a plurality of electrophoretic particles, wherein the data line and the pixel are located on the same side of the first substrate facing the electrophoretic particles; The electrophoretic particles are charged particles doped in the electrophoretic liquid.

14. The electrophoretic display panel according to claim 13, characterized in that: The plurality of electrophoretic particles include first electrophoretic particles and second electrophoretic particles, and the first electrophoretic particles and the second electrophoretic particles have different colors.

15. The electrophoretic display panel according to claim 13, characterized in that: The electrophoretic liquid and the electrophoretic particles have different colors.

16. The electrophoretic display panel according to claim 1, characterized in that: The difference between the target effective driving force and the theoretical effective driving force is less than or equal to 2.

17. A display device, characterized in that: The invention comprises the electrophoretic display panel according to any one of claims 1 to 16, and a driving chip, wherein the driving chip provides a data signal to a data line.

18. A driving method of the electrophoretic display panel according to claim 1, characterized in that: include: Obtaining initial grayscale and target grayscale; According to the initial grayscale and the target grayscale, and equation (1) and / or equation (2), a theoretical effective drive is obtained; Based on theoretical effective drive, obtain target effective drive.

19. The driving method according to claim 18, characterized in that: According to the effective drive theory, obtain the target effective drive, including: Taking the theoretical effective driving as the current effective driving, obtaining the current brightness of the electrophoretic display panel; Determine whether a deviation value between the current brightness and the target brightness at the target grayscale is less than or equal to a preset value; When the deviation value is greater than the preset value, the current effective drive is corrected according to the deviation value until the deviation value is less than or equal to the preset value, and the current effective drive is used as the target effective drive.

20. The driving method according to claim 18, characterized in that: After obtaining the target effective drive according to the theoretical effective drive, it also includes: A correspondence table among the initial grayscale, the target grayscale and the target effective drive is established.

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