Source driver, display device and driving method thereof

Abstract

The invention provides a source driver, a display device and a driving method thereof, which are used for reducing a line crosstalk phenomenon. The source driver comprises a gray-scale voltage generation module and a gray-scale signal output module, the gray-scale voltage generation module is used for generating a plurality of gray-scale voltages according to a plurality of gray-scale values in display data, the gray-scale voltage of a 0 gray-scale value in the plurality of gray-scale values is smaller than or equal to the gray-scale voltage of a 1 gray-scale value in the plurality of gray-scale values, and the gray-scale signal output module is used for outputting the gray-scale voltage of the 0 gray-scale value in the plurality of gray-scale values. The gray-scale voltage is greater than or equal to 16 gray-scale values in the plurality of gray-scale values; the gray-scale signal output module is electrically connected with the gray-scale voltage generation module, and is used for outputting a plurality of gray-scale signals based on the plurality of gray-scale voltages. By setting the gray-scale voltage of the zero gray-scale value in the specific range, the jumping amplitude of the gray-scale value is reduced, so that the line crosstalk line number is reduced, line crosstalk phenomenon superposition caused by automatic truncation operation executed by a line crosstalk compensation program is avoided, and the display effect is effectively improved.

Description

Technical Field

[0001] The present application relates to the field of display technologies, and particularly to a source driver, a display device, and a driving method thereof. Background Art

[0002] The types of crosstalk (a display anomaly) in a display panel can be roughly divided into line crosstalk and block (area) crosstalk, and the main cause is the effect of capacitive coupling. In medium-sized display panels such as those in laptop computers, the main influence is line crosstalk.

[0003] Line crosstalk is further divided into two phenomena: crosstalk "line" and crosstalk "halo". Generally, crosstalk "white lines" and crosstalk "black halos" will appear at the junction of white-to-black (switching from a high gray level to a low gray level), and crosstalk "black lines" and crosstalk "white halos" will appear at the junction of black-to-white (switching from a low gray level to a high gray level). The crosstalk "line" phenomenon is caused by a relatively large coupling capacitance between the data line and the high-potential power supply line VDD, resulting in an obvious coupling effect on the potential of the high-potential power supply line VDD when the voltage of the data line changes. The crosstalk "halo" is caused by overcharging of the high-potential power supply line VDD.

[0004] In the prior art, after the display panel design is finalized, compensation is generally performed through a line crosstalk compensation program (algorithm) of the source driver. This line crosstalk compensation program calculates the compensation value for the next row of pixels based on the difference in the average picture level (APL) of the upper and lower row pixels, and then provides different row compensation values and proportional weights according to the number of pixel rows where crosstalk actually occurs.

[0005] The characteristics of this compensation method are as follows: When the number of rows of line crosstalk in the display panel itself is small (such as 1 - 2 rows), using such a line crosstalk compensation program for compensation has a good effect. However, when the degree of line crosstalk in the display panel itself is relatively heavy (such as when the number of pixel rows with crosstalk is greater than 6 rows), for application scenarios with continuous jumps, the line crosstalk compensation program will perform an automatic truncation operation instead of completing the cumulative compensation, resulting in the superposition of line crosstalk phenomena and making the visual effect of line crosstalk poor.

[0006] For example, in the application scenario of displaying an Excel table, when all cells in the Excel table are fully selected and a black border is added, there are continuous jump behaviors. After switching from a white background to a black border line (white-to-black), multiple rows of crosstalk "white lines" and crosstalk "black halos" will be formed. During the compensation process of the line crosstalk compensation program, if it detects that the next jump state is black-to-white, it will immediately compensate for the crosstalk formed by black-to-white and terminate the previously unfinished crosstalk compensation, resulting in the crosstalk "black halos" under the displayed Excel table being more obvious visually.

[0007] Therefore, it is necessary to propose a new technical solution to solve the above technical problems. Summary of the Invention

[0008] An object of an embodiment of the present application is to provide a source driver, a display device, and a driving method thereof to reduce the line crosstalk phenomenon.

[0009] An embodiment of the present application provides a source driver, including: a grayscale voltage generation module configured to generate a plurality of grayscale voltages according to a plurality of grayscale values in display data, wherein the grayscale voltage of the 0 grayscale value among the plurality of grayscale values is less than or equal to the grayscale voltage of the 1 grayscale value among the plurality of grayscale values and greater than or equal to the grayscale voltage of the 16 grayscale value among the plurality of grayscale values; and a grayscale signal output module electrically connected to the grayscale voltage generation module and configured to output a plurality of grayscale signals based on the plurality of grayscale voltages.

[0010] In the above source driver, the grayscale voltage generation module includes: a register configured to store a plurality of register values, one grayscale value corresponding to three register values, and the three register values corresponding to the 0 grayscale value are not all 0; and a grayscale voltage conversion circuit electrically connected to the register and configured to generate the plurality of grayscale voltages according to the plurality of register values.

[0011] In the above source driver, the grayscale voltage conversion circuit is configured to generate the grayscale voltage according to the following formula: V = Vgmp - ((Vgmp - Vgsp) / 4095)*Reg; where V is the grayscale voltage, Vgmp is the highest voltage value, Vgsp is the lowest voltage value, and Reg is the register value.

[0012] In the above source driver, the grayscale voltage of the 0 grayscale value is less than or equal to the grayscale voltage of the 1 grayscale value and greater than or equal to the grayscale voltage of the 5 grayscale value among the plurality of grayscale values.

[0013] An embodiment of the present application further provides a display device, including: a display panel including a plurality of red pixels, a plurality of green pixels, and a plurality of blue pixels; and a source driver electrically connected to the display panel, the source driver including: a grayscale voltage generation module configured to generate a plurality of grayscale voltages according to a plurality of grayscale values in display data, wherein the grayscale voltage of the 0 grayscale value among the plurality of grayscale values is less than or equal to the grayscale voltage of the 1 grayscale value among the plurality of grayscale values and greater than or equal to the grayscale voltage of the 16 grayscale value among the plurality of grayscale values; and a grayscale signal output module electrically connected to the grayscale voltage generation module and configured to output a plurality of grayscale signals to the display panel based on the plurality of grayscale voltages.

[0014] In the above display device, the grayscale voltage generation module includes: a register configured to store a plurality of register values, where one grayscale value corresponds to three register values, and the three register values corresponding to the 0 grayscale value are not all 0; and a grayscale voltage conversion circuit electrically connected to the register and configured to generate a plurality of grayscale voltages to be output to a plurality of red pixels, a plurality of green pixels, and a plurality of blue pixels according to the plurality of register values.

[0015] In the above display device, the grayscale voltage conversion circuit is configured to generate the grayscale voltage according to the following formula: V = Vgmp - ((Vgmp - Vgsp) / 4095) * Reg; where V is the grayscale voltage, Vgmp is the highest voltage value, Vgsp is the lowest voltage value, and Reg is the register value.

[0016] In the above display device, the grayscale voltage of the 0 grayscale value is greater than or equal to the grayscale voltage of the 1 grayscale value and less than or equal to the grayscale voltage of the 5 grayscale value among the plurality of grayscale values.

[0017] An embodiment of the present application further provides a driving method for a display device. The driving method includes: receiving display data; when the display data includes data of the 0 grayscale value, generating a grayscale signal based on the grayscale voltage of the 0 grayscale value, where the grayscale voltage of the 0 grayscale value is less than or equal to the grayscale voltage of the 1 grayscale value and greater than or equal to the grayscale voltage of the 16 grayscale value; and outputting the grayscale signal to the display panel.

[0018] In the above driving method, generating the grayscale signal based on the grayscale voltage of the 0 grayscale value includes: reading three register values corresponding to the 0 grayscale value from the register, where the three register values corresponding to the 0 grayscale value are not all 0; and generating the grayscale voltage of the 0 grayscale value according to the register values corresponding to the 0 grayscale value.

[0019] In the above driving method, generating the grayscale voltage of the 0 grayscale value according to the register values corresponding to the 0 grayscale value includes: generating the grayscale voltage of the 0 grayscale value according to the following formula: V = Vgmp - ((Vgmp - Vgsp) / 4095) * Reg; where V is the grayscale voltage, Vgmp is the highest voltage value, Vgsp is the lowest voltage value, and Reg is the register value.

[0020] In the above driving method, the grayscale voltage of the 0 grayscale value is less than or equal to the grayscale voltage of the 1 grayscale value and greater than or equal to the grayscale voltage of the 5 grayscale value.

[0021] The source driver, display device, and driving method provided by the present application effectively reduce the line crosstalk phenomenon by setting the grayscale voltage of the 0 grayscale value to the grayscale voltage of a non-0 grayscale value (for example, the grayscale voltage within the range of less than or equal to the grayscale voltage of 1 grayscale value and greater than or equal to the grayscale voltage of 16 grayscale values). Specifically, when the display content changes from white to black (for example, switches from the 255 grayscale value to the 0 grayscale value), it actually changes from white to gray (for example, switches from the 255 grayscale value to approximately the 2 grayscale value), which significantly reduces the amplitude of the grayscale value jump, thereby reducing the number of crosstalk lines. Similarly, when the display content changes from black to white (for example, switches from the 0 grayscale value to the 255 grayscale value), it actually changes from gray to white (for example, switches from approximately the 2 grayscale value to the 255 grayscale value), which also reduces the amplitude of the grayscale value jump and correspondingly reduces the number of crosstalk lines.

[0022] Since the number of crosstalk lines is significantly reduced, even in application scenarios where the screen content continuously jumps (such as the white background with black grid lines in an Excel table), the crosstalk compensation program can complete the compensation for all crosstalk lines and will not perform an automatic truncation operation due to detecting the next jump state, thereby effectively avoiding the superposition and accumulation of the line crosstalk phenomenon. Actual tests show that this method can almost completely eliminate the crosstalk "black halo" phenomenon in the Excel table application scenario, making the display effect of the Excel table clearer and sharper, and greatly improving the user's visual experience.

[0023] In addition, the technical solution of the present application stores specific register values in the registers in the grayscale voltage generation module, and generates corresponding grayscale voltages according to these register values through the grayscale voltage conversion circuit, realizing precise control of the grayscale voltage of the 0 grayscale value. In particular, by differentially setting the grayscale voltages of the red pixels, green pixels, and blue pixels (for example, the three register values corresponding to the 0 grayscale value are not all 0), it is possible to improve the line crosstalk while maintaining a good black visual effect. Description of the Drawings

[0024] Figure 1 is a schematic diagram of a pyramid image displayed by a traditional display device.

[0025] Figure 2 is a schematic diagram of the crosstalk "white line" and crosstalk "black halo" that appear at the junction of white to black and the crosstalk "black line" and crosstalk "white halo" that appear at the junction of black to white in a traditional display device.

[0026] Figure 3 is the appearance of Figure 2 the circuit diagram of the pixel of the display device with the problems shown.

[0027] Figure 4 , Figure 5 andFigure 6 is Figure 3 the waveform diagrams of the signal input terminal and the node in the circuit diagram of the pixel shown in Figure 3 .

[0028] Figure 7 is a schematic diagram of the crosstalk "black halo" phenomenon that occurs in a traditional display device in the application scenario of displaying an Excel table.

[0029] Figure 8 is a schematic diagram of the display device provided by the embodiment of the present application.

[0030] Figure 9 is a block diagram of the source driver provided by the embodiment of the present application.

[0031] Figure 10 is Figure 9 the block diagram of the grayscale voltage generation module in the source driver shown in Figure 9 .

[0032] Figure 11 is a flowchart of the driving method of the display device provided by the embodiment of the present application.

[0033] Figure 12 is Figure 11 the flowchart of step 1102 in the driving method of the display device shown in Figure 11 .

[0034] Figure 13 is a schematic diagram of the line crosstalk phenomenon of the display device of the present application being reduced to an almost invisible level in the application scenario of displaying an Excel table. Detailed implementation manners

[0035] The following will describe in detail the specific implementation manners of the present application in conjunction with the accompanying drawings.

[0036] The terms "first", "second" and similar words do not denote any order, quantity or importance, but are only used to distinguish different technical features. The term "plurality" and similar words mean two or more, unless otherwise clearly defined.

[0037] The embodiments of the present application can be combined with each other.

[0038] The embodiments of the present application provide a source driver, a display device and a driving method thereof, aiming to solve the problem of line crosstalk in the existing display technology.

[0039] Crosstalk refers to a display anomaly where the image displayed in a certain area of a display panel is affected by another area, resulting in image distortion. The types of crosstalk can be roughly divided into line crosstalk and block (area) crosstalk, and the main cause is the effect of capacitive coupling. In medium-sized display panels such as laptop computers (e.g., OLED display panels, Mini-LED display panels, Micro-LED display panels), the main influence is line crosstalk. As Figure 1 shown, in the pyramid image, when entering the black block located in the gray background from the gray background, a white line (i.e., line crosstalk) that runs through the right edge of the entire image will appear in the right area flush with the first row of pixels of the black block. When entering the gray background from the bottom row of pixels of the black block, a black line that runs through the right edge of the entire image will appear in the right area flush with the bottom of the black block. The white / black lines that appear above are line crosstalk.

[0040] In this application, it is defined that white-to-black is the switching from A gray-scale value to a gray-scale value less than A. For example, switching from 32 gray-scale value to 0 gray-scale value; black-to-white is the switching from A gray-scale value to a gray-scale value greater than A, such as switching from 0 gray-scale value to 32 gray-scale value.

[0041] Line crosstalk is further divided into two phenomena: crosstalk "line" and crosstalk "halo". Crosstalk "line" is the Figure 1 phenomenon shown in the schematic. Crosstalk "halo" appears immediately below the crosstalk "line". Since it is in a spreading shape, similar to smudging, it is called "halo". As Figure 2 shown, generally, crosstalk "white line" and crosstalk "black halo" will appear at the junction of white-to-black, and crosstalk "black line" and crosstalk "white halo" will appear at the junction of black-to-white.

[0042] Taking white (gray)-to-black as an example, the formation mechanism of crosstalk "line" and crosstalk "halo" is as Figure 4 and Figure 5 shown. In Figure 4 , in stage S1, when scanning along the scanning direction of the gate driving circuit to the position of white-to-black of the image displayed on the display panel (the position where the high gray-scale value area of the image displayed on the display panel enters the low gray-scale value area), the voltage of the data signal (DATA) jumps up, coupling the potential of the high-potential power supply line VDD to a higher potential (a potential higher than the original constant voltage of the high-potential power supply line VDD). The scan signal (SCAN) turns on the pixels of the display panel (a pixel includes a pixel driving circuit and a light-emitting device, and the pixel driving circuit includes 7 transistors and 1 capacitor, as Figure 3The second transistor T2 and the third transistor T3 of the pixel driving circuit (as shown) (at this time, the scan signal (SCAN) is at a low level, and the second transistor T2 and the third transistor T3, which are P-type transistors, can be turned on), and the data signal (DATA) is written at point Q; in the S2 stage, the high-potential power supply line VDD gradually recovers (decreases) to a constant voltage. Affected by the coupling effect of the high-potential power supply line VDD, the potential at point Q is pulled down, and the display is brighter, which is an obvious crosstalk "line" phenomenon.

[0043] As Figure 5 and Figure 6 shown, in the S1 stage, when scanning to the overcharge position 501 of the high-potential power supply line VDD along the scanning direction of the gate driving circuit, the scan signal (SCAN) turns on the second transistor T2 and the third transistor T3, and the data signal (DATA) is written at point Q; in the S2 stage, the high-potential power supply line VDD gradually recovers (decreases) to a constant voltage. Affected by the coupling effect of the high-potential power supply line VDD, the potential at point Q is pulled up, and the display is darker, which is an obvious crosstalk "halo" phenomenon.

[0044] When changing from black to white, the formation mechanisms of crosstalk "line" and crosstalk "halo" are similar, but the bright and dark colors are opposite. In short, the crosstalk "line" phenomenon is caused by the relatively large coupling capacitance between the data line DATA and the high-potential power supply line VDD, resulting in an obvious coupling effect on the potential of the high-potential power supply line VDD when the data line voltage changes. The crosstalk "halo" is caused by the overcharging of the high-potential power supply line VDD.

[0045] In the prior art, after the display panel design is finalized, it is generally compensated by the line crosstalk compensation program of the source driver. The compensation principle is as follows: Calculate the compensation value of the next row of pixels according to the difference in APL (Average Picture Level) of the upper and lower row pixels, and then provide different row compensation values and proportional weights according to the actual number of pixel rows with crosstalk (this line crosstalk compensation program can compensate up to 16 rows of pixels) Finally, based on a specific test scenario, the crosstalk effect after compensation is tested.

[0046] This compensation method has a good effect when the number of pixel rows with line crosstalk in the display panel itself is small (such as 1 - 2 rows). However, there are deficiencies in the design of the existing line crosstalk compensation program of the source driver. When the degree of line crosstalk in the display panel itself is relatively heavy (such as the number of pixel rows with crosstalk is greater than 6 rows), for application scenarios with continuous jumps, the line crosstalk compensation program will perform an automatic truncation operation instead of completing cumulative compensation, resulting in the superposition of the line crosstalk phenomenon and making the visual effect of the line crosstalk poor.

[0047] As Figure 7As shown, in the application scenario of displaying an Excel table, all cells of the Excel table are fully selected and a black frame is added. In this case, there is a continuous jumping behavior: the gray scale value of the black frame line of the Excel table is 0 and it occupies 3 rows of pixels, and the gray scale value of the white background area of the Excel table is 255. After the first row of black line is cut from the white background to the black frame line (white to black), 4 rows of crosstalk "white lines" and 8 rows of crosstalk "black halos" will be formed. The line crosstalk compensation program originally planned to compensate 4 rows of "lines" and 8 rows of "halos", but when the third row of the line was compensated, it was detected that the next jumping state was black to white, so the crosstalk "black line / white halo" formed by black to white was immediately compensated, and the compensation of the remaining 1 row of uncompensated crosstalk "white line" and 5 rows of "black halo" was terminated, resulting in the crosstalk "black halo" in the Excel screen being more obvious visually.

[0048] This behavior of the line crosstalk compensation program of the above source driver is called truncation processing. There is a white background and a black frame in each row of the Excel screen, which means that the compensation program detects that the screen is continuously cycling through white to black → black to white → white to black → black to white, and this situation is called continuous jumping in the application scenario. As a result, the uncompensated lines and black halos in the Excel application scenario continue to exist, as Figure 7 shown by the crosstalk "black halo" (area 701), and this visual effect has a greater impact on the user experience on a laptop.

[0049] Since the design of the display panel has been finalized and the design of the line crosstalk compensation program of the source driver has also been finalized, the above crosstalk problem is difficult to solve without changing the photomask and re - modifying the source driver.

[0050] Through experiments, it is found that the most serious crosstalk occurs when switching from the highest gray scale value (L255) to the lowest gray scale value (L0) or from the lowest gray scale value (L0) to the highest gray scale value (L255). Since the white screen with a gray scale value of 255 is a common application scenario and cannot be changed, and it is difficult for the human eye to distinguish the subtle difference between the gray scale value of 0 and 1 in a dark screen, this application adjusts the gray scale voltage of the 0 gray scale value to reduce the line crosstalk phenomenon.

[0051] According to the gray scale voltage calculation formula: V = Vgmp - ((Vgmp - Vgsp) / 4095)*Reg (1) where the initial value Vgmp = 7.6v; Vgsp = 1.5v; Reg corresponds to the register value of the 0 - 255 gray scale values, the register value is 0 at the 0 gray scale value and 4095 at the 255 gray scale value.

[0052] Although the grayscale value ranges of the red pixels, green pixels, and blue pixels of the display device are 0 - 255 (8-bit precision), the source driver uses 12-bit precision to generate the driving voltage. 4095 is the maximum value of a 12-bit binary number (2^12 - 1), and the source driver uses register values from 0 - 4095 to achieve precise voltage control. The 0 - 255 grayscale values are converted to 0 - 4095 register values through a mapping relationship, where the 0 grayscale value corresponds to the register value 0, the 255 grayscale value corresponds to the register value 4095, and the intermediate grayscale values are mapped proportionally.

[0053] When inputting register values of different grayscale values, the voltage V corresponding to the grayscale value can be calculated through formula (1). Through analysis, it can be seen that the grayscale voltage difference between the 0 grayscale value and the 1 grayscale value is relatively large, and this large voltage change will cause serious line crosstalk phenomenon. Therefore, the present application proposes a technical solution for assigning the 0 grayscale value, that is, adjusting the grayscale voltage corresponding to the 0 grayscale value to the range of 1 - 16 grayscale values (preferably within the range of 1 - 5 grayscale values), and by differentially setting the grayscale voltages of the red pixels, green pixels, and blue pixels, the purpose of improving line crosstalk is achieved.

[0054] As Figure 9 and Figure 10 shown, the source driver in the embodiment of the present application includes a grayscale voltage generation circuit 901 and a grayscale signal output circuit 902. The grayscale voltage generation circuit 901 is used to generate multiple grayscale voltages according to multiple grayscale values in the display data, where the grayscale voltage of the 0 grayscale value among the multiple grayscale values is less than or equal to the grayscale voltage of the 1 grayscale value among the multiple grayscale values and greater than or equal to the grayscale voltage of the 16 grayscale value among the multiple grayscale values. This setting within a specific range can effectively reduce the number of crosstalk lines caused by continuous jumps in the picture content. The grayscale signal output circuit 902 is electrically connected to the grayscale voltage generation circuit 901 and is used to output multiple grayscale signals based on the multiple grayscale voltages.

[0055] In the embodiment of the present application, the grayscale voltage generation circuit 901 includes a register 9011 and a grayscale voltage conversion circuit 9012. The register 9011 is used to store multiple register values, and one grayscale value corresponds to three register values, which respectively correspond to the grayscale voltage settings of the red pixels, green pixels, and blue pixels. The three register values corresponding to the 0 grayscale value are not all 0, which means that at least one pixel channel's register value is set to a non-zero value. The grayscale voltage conversion circuit 9012 is electrically connected to the register 9011 and is used to generate corresponding grayscale voltages according to these stored register values.

[0056] The grayscale voltage conversion circuit 9012 generates the grayscale voltage according to the following formula: V = Vgmp - ((Vgmp - Vgsp) / 4095)*Reg Among them, V is the grayscale voltage, representing the actual voltage value output to the display panel; Vgmp is the highest voltage value, usually set to 7.6 volts; Vgsp is the lowest voltage value, usually set to 1.5 volts; Reg is the register value, ranging from 0 to 4095, corresponding to grayscale values from 0 to 255. By adjusting the Reg value, the output grayscale voltage can be precisely controlled.

[0057] In the embodiment of the present application, the grayscale voltage of the 0 grayscale value is less than or equal to the grayscale voltage of the 1 grayscale value and greater than or equal to the grayscale voltage of the 5 grayscale value among multiple grayscale values. This specific range is selected because experiments have shown that when the grayscale voltage of the 0 grayscale value is adjusted within this range, the number of crosstalk rows can be significantly reduced while maintaining the visual blackness of the screen, without significantly affecting the user's perception of the dark part of the screen.

[0058] The three register values corresponding to the 0 grayscale value are 0x000, 0x086, and 0x0C9 respectively. These three hexadecimal values correspond to the register 9011 settings of the red, green, and blue channels respectively. Through a large number of experimental tests, this specific combination of register values can most effectively reduce the line crosstalk phenomenon while maintaining the visual blackness of the screen. By keeping the register value of the red channel at 0 and adjusting the register values of the green and blue channels, the grayscale voltage of the 0 grayscale value can be changed while maintaining a good black visual effect, because the human eye is most sensitive to changes in the red channel.

[0059] In the embodiment of the present application, the grayscale voltage of the 0 grayscale value refers to the grayscale voltages of the three color channels corresponding to the red pixel, green pixel, and blue pixel. Specifically, the 0 grayscale value includes the 0 grayscale value of the red pixel, the 0 grayscale value of the green pixel, and the 0 grayscale value of the blue pixel, and each color channel has a corresponding grayscale voltage.

[0060] In display technology, grayscale values are divided into two levels: pixel-level grayscale values and sub-pixel-level grayscale values. Pixel-level grayscale values refer to the overall gray level (0 - 255) displayed by each pixel point, which is the final effect seen by the user; sub-pixel-level grayscale values refer to the gray levels of each RGB sub-pixel (red 0 - 255, green 0 - 255, blue 0 - 255). The "0 grayscale value" in the present application refers to the pixel-level 0 grayscale value, that is, the state when the entire pixel is displayed as black, usually corresponding to the 0 grayscale value of the red pixel, the 0 grayscale value of the green pixel, and the 0 grayscale value of the blue pixel.

[0061] In the traditional technical solution, the three register values corresponding to the 0 gray level value are all 0x000. According to the gray level voltage calculation formula V = Vgmp - ((Vgmp - Vgsp) / 4095)*Reg, where Vgmp = 7.6v, Vgsp = 1.5v, and Reg = 0, the gray level voltage of the traditional 0 gray level value can be calculated as: V = 7.6 - ((7.6 - 1.5) / 4095)*0 = 7.6v. Therefore, the gray level voltages of the 0 gray level values of the red, green, and blue channels in the traditional solution are all 7.6v.

[0062] In the embodiment of the present application, the three register values corresponding to the 0 gray level value are respectively adjusted to 0x000, 0x086, and 0x0C9 (decimal is 0, 134, 201). According to the same calculation formula, the gray level voltages of the adjusted 0 gray level values are respectively: Red channel: V_R = 7.6 - ((7.6 - 1.5) / 4095)*0 = 7.6v; Green channel: V_G = 7.6 - ((7.6 - 1.5) / 4095)*134 = 7.6 - 6.1*134 / 4095 = 7.6 - 0.2 = 7.4v; Blue channel: V_B = 7.6 - ((7.6 - 1.5) / 4095)*201 = 7.6 - 6.1*201 / 4095 = 7.6 - 0.3 = 7.3v.

[0063] To better understand the adjustment range of the gray level voltage of the 0 gray level value in the technical solution of the present application, the gray level voltages of each channel of other gray level values are calculated below. The register value corresponding to the 1 gray level value is 16, and the gray level voltages of the red, green, and blue channels are all: V_1 = 7.6 - ((7.6 - 1.5) / 4095)*16 = 7.6 - 6.1*16 / 4095 = 7.6 - 0.024 = 7.576v. The register value corresponding to the 2 gray level value is 32, and the gray level voltages of the red, green, and blue channels are all: V_2 = 7.6 - ((7.6 - 1.5) / 4095)*32 = 7.6 - 6.1*32 / 4095 = 7.6 - 0.048 = 7.552v. The register value corresponding to the 5 gray level value is 80, and the gray level voltages of the red, green, and blue channels are all: V_5 = 7.6 - ((7.6 - 1.5) / 4095)*80 = 7.6 - 6.1*80 / 4095 = 7.6 - 0.119 = 7.481v. The register value corresponding to the 16 gray level value is 256, and the gray level voltages of the red, green, and blue channels are all: V_16 = 7.6 - ((7.6 - 1.5) / 4095)*256 = 7.6 - 6.1*256 / 4095 = 7.6 - 0.381 = 7.219v.

[0064] As can be seen from the above calculations, in the embodiments of the present application, the grayscale voltage of the red channel for the adjusted 0 grayscale value is 7.6V, the grayscale voltage of the green channel is 7.4V, and the grayscale voltage of the blue channel is 7.3V. Among them, 7.6V of the red channel is approximately equal to the grayscale voltage of 7.576V for 1 grayscale value, 7.4V of the green channel is between the grayscale voltage of 7.576V for 1 grayscale value and the grayscale voltage of 7.219V for 16 grayscale values, and 7.3V of the blue channel is between the grayscale voltage of 7.576V for 1 grayscale value and the grayscale voltage of 7.219V for 16 grayscale values. Considering the grayscale voltages of the red channel, the green channel, and the blue channel comprehensively, the grayscale voltage of 0 grayscale value is less than or equal to the grayscale voltage of 1 grayscale value and greater than or equal to the grayscale voltage of 16 grayscale values. This adjustment effectively reduces the amplitude of the grayscale voltage jump between 0 grayscale value and other grayscale values, thereby reducing the number of line crosstalk rows.

[0065] The display device provided by the embodiments of the present application can be an OLED display device, a Mini-LED display device, or a Micro-LED display device. Hereinafter, the OLED display device will be taken as an example for illustration.

[0066] As Figure 8 shown, the display device provided by the embodiments of the present application includes a display panel and a source driver. The display panel includes a gate driving circuit and a plurality of pixels PX. The gate driving circuit includes multiple cascaded gate driving sub-circuits.

[0067] The display panel includes a display area and a non-display area. The display area is provided with a plurality of pixels PX arranged in an array, and the non-display area is located around the display area. The display panel further includes multiple gate lines SCAN, multiple data lines DATA, multiple emission control signal lines EM, an emission controller, and a gate driving circuit. The multiple gate lines SCAN and the multiple emission control signal lines EM extend along a first direction and are arranged along a second direction, and the multiple data lines DATA extend along the second direction and are arranged along the first direction, and the first direction is perpendicular to the second direction. The gate driving circuit is disposed in the non-display area and is electrically connected to the multiple gate lines SCAN. The source driver is electrically connected to the multiple data lines DATA through a flexible circuit board. The display device further includes a timing controller, and the timing controller is electrically connected to the gate driving circuit and the source driver.

[0068] The display panel includes an organic light-emitting diode array substrate and a packaging layer. The organic light-emitting diode array substrate includes a substrate, a buffer layer disposed on the substrate, an active layer disposed on the buffer layer, a gate insulating layer disposed on the active layer, a first metal layer disposed on the gate insulating layer, an interlayer insulating layer disposed on the first metal layer, a second metal layer disposed on the interlayer insulating layer, a planarization layer disposed on the second metal layer, a first electrode layer disposed on the planarization layer, a pixel defining layer disposed on the first electrode layer, an organic light-emitting layer disposed in the opening region defined by the pixel defining layer, and a second electrode layer disposed on the organic light-emitting layer. The first metal layer includes a gate line SCAN and a gate electrode. The second metal layer includes a data line DATA, a source electrode, and a drain electrode. The packaging layer is hermetically connected to the organic light-emitting diode array substrate.

[0069] Each pixel PX includes a pixel driving circuit and a light-emitting device. The pixel driving circuit includes at least two transistors and a storage capacitor. One of the transistors serves as a switching transistor, whose gate is electrically connected to the corresponding gate line SCAN, and whose source is electrically connected to the corresponding data line DATA; the other transistor serves as a driving transistor, whose gate is electrically connected to the drain of the switching transistor, whose source is electrically connected to the first power supply voltage line, and whose drain is electrically connected to the anode of the light-emitting device. One end of the storage capacitor is electrically connected to the gate of the driving transistor, and the other end is electrically connected to the source or drain of the driving transistor. The cathode of the light-emitting device is electrically connected to the second power supply voltage line. The transistors in the aforementioned pixel driving circuit include Figure 3 the first transistor T1 to the seventh transistor T7, the storage capacitor Cst, the node A, the node B, the node C, the node Q, the reset signal input terminal VI_GATE, the reset signal input terminal VI_ANO, the reset control signal input terminal RST, the high potential power supply terminal VDD, the low potential power supply terminal VSS, the scan signal input terminal SCAN, the data signal input terminal DATA, and the light emission control signal input terminal EM as shown.

[0070] The gate driving circuit includes a plurality of cascaded gate driving sub-circuits, and each stage of the gate driving sub-circuit is electrically connected to a gate line SCAN. Under the control of the timing controller, the gate driving sub-circuit sequentially outputs scan signals to scan each row of pixels PX in the display area row by row. The source driver generates and outputs data signals according to the image data under the control of the timing controller. The timing controller is used to receive and process externally input image data and timing signals, generate control signals, and transmit the image data to the source driver. The display device further includes a power management chip for providing operating voltages for various parts of the display device, including providing the second power supply voltage for the cathode of the light-emitting device, providing the first power supply voltage for the first power supply voltage line, providing the gate driving voltage for the gate driving circuit, etc.

[0071] The source driver includes the aforementioned grayscale voltage generation circuit 901 and grayscale signal output circuit 902, and reduces the line crosstalk phenomenon by adjusting the grayscale voltage of the 0 grayscale value.

[0072] As Figure 11 and Figure 12 shown, an embodiment of the present application further provides a driving method for a display device, and the method includes: receiving display data (step 1101); when the display data includes data of 0 grayscale value, generating a grayscale signal based on the grayscale voltage of the 0 grayscale value (step 1102); and outputting the grayscale signal to the display panel (step 1103). Among them, the grayscale voltage of the 0 grayscale value is less than or equal to the grayscale voltage of the 1 grayscale value and greater than or equal to the grayscale voltage of the 16 grayscale value. This method can improve the line crosstalk phenomenon through software adjustment without changing the hardware design of the display panel.

[0073] When specifically implemented, the step of generating a grayscale signal based on the grayscale voltage of the 0 grayscale value (step 1102) includes: reading three register values corresponding to the 0 grayscale value from the register 9011, and these three values are respectively the first register value corresponding to the red pixel, the second register value corresponding to the green pixel, and the third register value corresponding to the blue pixel (step 11021); then according to these register values, generating the corresponding grayscale voltage using the aforementioned formula (step 11022). Among them, the first register value is 0x000, the second register value is 0x086, and the third register value is 0x0C9.

[0074] The specific measure taken by the embodiment of the present application is that in the preparation stage before the display device leaves the factory, the initial values of the registers 9011 corresponding to the red, green, and blue channels in the source driver are respectively modified from the original 0x000 / 0x000 / 0x000 (all 0) to 0x000 / 0x086 / 0x0C9 (decimal is 0 / 134 / 201). Through this modification, in the actual use stage of the display device, the grayscale voltages of the red, green, and blue pixels output by the source driver change from the original 7.6v / 7.6v / 7.6v to 7.6v / 7.4v / 7.3v. Keeping the red channel unchanged and only adjusting the green and blue channels is because the human eye is more sensitive to the brightness change of red, and this differential setting can improve the line crosstalk while keeping the visual blackness of the picture as much as possible.

[0075] This step essentially reassigns the register value of the 0 gray scale value, and then calculates the new gray scale voltage according to the modified register value combined with formula (1). The selected combination of specific register values of 0x000 / 0x086 / 0x0C9 is the best setting obtained through hundreds of experiments. Under this setting, the line crosstalk phenomenon observed by the human eye can be reduced to an almost invisible level. Although this set of values is not the only feasible solution, experiments have proven that this method is effective. The final register value setting mainly depends on the visual perception effect of the human eye and the actual display test results.

[0076] Importantly, in the embodiments of the present application, only the gray scale voltage setting of the 0 gray scale value is modified, and the settings of other gray scale values (gray scale values from 1 to 255) remain unchanged. This targeted modification maximally maintains the original display effect while effectively solving the line crosstalk problem. Through actual test verification, after the gray scale voltage is adjusted, the line crosstalk phenomenon in various application scenarios has been significantly improved; on this basis, if the parameters of the line crosstalk compensation program are further optimized and adjusted, the line crosstalk phenomenon can be further reduced to an almost invisible level, such as Figure 13 the Excel table screen effect (area 1301) shown.

[0077] Through the above method, in the embodiments of the present application, without changing the display panel design and the source driver hardware, by precisely adjusting the gray scale voltage of the 0 gray scale value, the line crosstalk phenomenon is effectively reduced. Specifically, since the gray scale voltage of the 0 gray scale value in the embodiments of the present application is less than or equal to the gray scale voltage of the 1 gray scale value and greater than or equal to the gray scale voltage of the 16 gray scale value (the preferred range is greater than or equal to the gray scale voltage of the 5 gray scale value), when the display content changes from white to black (for example, from the 255 gray scale value to the 0 gray scale value), it actually changes from white to gray (for example, from the 255 gray scale value to about the 2 gray scale value), thus greatly reducing the amplitude of the gray scale value jump. Tests show that the number of line crosstalk rows can be reduced from about 12 rows originally to 3 - 4 rows. Similarly, when the display content changes from black to white (for example, from the 0 gray scale value to the 255 gray scale value), it actually changes from gray to white (for example, from about the 2 gray scale value to the 255 gray scale value), which also reduces the amplitude of the gray scale value jump and correspondingly reduces the number of line crosstalk rows.

[0078] Since the number of line crosstalk rows is significantly reduced, even in application scenarios where the screen content changes continuously (such as the white background and black grid lines in an Excel table), the line crosstalk compensation program can complete the compensation for all crosstalk rows without performing an automatic truncation operation because the next jump state is detected, thus effectively avoiding the superposition and accumulation of line crosstalk phenomena. Practical tests show that this method can almost completely eliminate the crosstalk "halo" phenomenon in the Excel table application scenario, making the display effect of the Excel table clearer and sharper, and greatly improving the user's visual experience and work efficiency.

[0079] In addition, since this solution only needs to modify the register 9011 settings of the source driver without changing the physical structure of the display panel or replacing the hardware, the implementation cost is extremely low, and it is applicable to various small and medium-sized display panels, including but not limited to OLED display panels, Mini-LED display panels, and Micro-LED display panels.

[0080] The above has introduced the embodiments of the present application in detail. The content of this specification should not be construed as a limitation on the protection scope of the present application.

Claims

1. A source driver, characterized in that, Comprising: A grayscale voltage generation module configured to generate a plurality of grayscale voltages according to a plurality of grayscale values in display data, wherein the grayscale voltage of the 0 grayscale value among the plurality of grayscale values is less than or equal to the grayscale voltage of the 1 grayscale value among the plurality of grayscale values and greater than or equal to the grayscale voltage of the 16 grayscale value among the plurality of grayscale values; And A grayscale signal output module electrically connected to the grayscale voltage generation module and configured to output a plurality of grayscale signals based on the plurality of grayscale voltages.

2. The source driver according to claim 1, wherein The grayscale voltage generation module includes: A register configured to store a plurality of register values, one grayscale value corresponding to three register values, and the three register values corresponding to the 0 grayscale value not all being 0; and A grayscale voltage conversion circuit electrically connected to the register and configured to generate the plurality of grayscale voltages according to the plurality of register values.

3. The source driver according to claim 1, wherein The grayscale voltage conversion circuit is configured to generate the grayscale voltage according to the following formula: V = Vgmp - ((Vgmp - Vgsp) / 4095)*Reg; Wherein, V is the grayscale voltage, Vgmp is the highest voltage value, Vgsp is the lowest voltage value, and Reg is the register value.

4. The source driver according to claim 1, wherein The grayscale voltage of the 0 grayscale value is less than or equal to the grayscale voltage of the 1 grayscale value and greater than or equal to the grayscale voltage of the 5 grayscale value among the plurality of grayscale values.

5. A display device, characterized in that, Comprising: A display panel including a plurality of red pixels, a plurality of green pixels, and a plurality of blue pixels; And A source driver electrically connected to the display panel, the source driver including: A grayscale voltage generation module configured to generate a plurality of grayscale voltages according to a plurality of grayscale values in display data, wherein the grayscale voltage of the 0 grayscale value among the plurality of grayscale values is less than or equal to the grayscale voltage of the 1 grayscale value among the plurality of grayscale values and greater than or equal to the grayscale voltage of the 16 grayscale value among the plurality of grayscale values; and A grayscale signal output module electrically connected to the grayscale voltage generation module and configured to output a plurality of grayscale signals to the display panel based on the plurality of grayscale voltages.

6. The display device according to claim 5, wherein The grayscale voltage generation module includes: A register configured to store a plurality of register values, one grayscale value corresponding to three register values, and the three register values corresponding to the 0 grayscale value not all being 0; and A grayscale voltage conversion circuit electrically connected to the register and configured to generate the plurality of grayscale voltages to be output to the plurality of red pixels, the plurality of green pixels, and the plurality of blue pixels according to the plurality of register values.

7. The display device according to claim 5, wherein, The grayscale voltage conversion circuit is configured to generate the grayscale voltage according to the following formula: V = Vgmp - ((Vgmp - Vgsp) / 4095)*Reg; Wherein, V is the grayscale voltage, Vgmp is the highest voltage value, Vgsp is the lowest voltage value, and Reg is the register value.

8. The display device according to claim 5, wherein The grayscale voltage of the 0 grayscale value is less than or equal to the grayscale voltage of the 1 grayscale value and greater than or equal to the grayscale voltage of the 5 grayscale value among the plurality of grayscale values.

9. A driving method of a display device, characterized in that, The driving method includes: Receiving display data; When the display data includes data with a 0 gray level value, a gray level signal is generated based on the gray level voltage of the 0 gray level value, where the gray level voltage of the 0 gray level value is less than or equal to the gray level voltage of the 1 gray level value and greater than or equal to the gray level voltage of the 16 gray level value; and The gray level signal is output to the display panel.

10. The driving method according to claim 9, wherein Generating the gray level signal based on the gray level voltage of the 0 gray level value includes: Reading three register values corresponding to the 0 gray level value from the register, where the three register values corresponding to the 0 gray level value are not all 0; and Generating the gray level voltage of the 0 gray level value according to the register values corresponding to the 0 gray level value.

11. The driving method according to claim 10, wherein Generating the gray level voltage of the 0 gray level value according to the register values corresponding to the 0 gray level value includes: Generating the gray level voltage of the 0 gray level value according to the following formula: V = Vgmp - ((Vgmp - Vgsp) / 4095)*Reg; where V is the gray level voltage, Vgmp is the highest voltage value, Vgsp is the lowest voltage value, and Reg is the register value.

12. The driving method according to claim 9, wherein The gray level voltage of the 0 gray level value is less than or equal to the gray level voltage of the 1 gray level value and greater than or equal to the gray level voltage of the 5 gray level value.

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