Display device and display driving method

Abstract

The application discloses a display device and a display driving method. The display device comprises a timing controller, a power management circuit and a source driving circuit. The timing controller receives image data to be displayed, judges whether the image data comprises a crosstalk picture, and sends a voltage modification instruction when the image data comprises the crosstalk picture. The power management circuit increases an output analog power voltage according to the voltage modification instruction. The source driving circuit outputs corresponding data signals according to the analog power voltage. The analog power voltage inputted by the source driving circuit can be increased when the crosstalk picture is displayed, the falling amplitude of gamma voltage is reduced, the falling amplitude of the data signals is reduced, the crosstalk picture is improved by parameter modification, the hardware cost is not increased, and the negative effects can be reduced under the condition of improving the crosstalk picture.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a display device and a display driving method. Background Technology

[0002] During the display process, crosstalk occasionally occurred, which affected the image quality.

[0003] To improve crosstalk in images, various technologies are employed. However, while these technologies improve crosstalk, they also introduce other negative effects. For example, they increase the cost of materials such as capacitors, enlarge the printed circuit board (PCB) area with little effect; or they increase panel power consumption and heat generation in the source drive circuit; or they increase power consumption and heat generation in the inductors of the DC-DC converter circuit.

[0004] Therefore, it is necessary to propose a display device that can improve crosstalk images while reducing or avoiding the aforementioned negative effects. Summary of the Invention

[0005] This application provides a display device and a display driving method to improve the technical problem of crosstalk in images while reducing or avoiding negative effects.

[0006] In a first aspect, this application provides a display device, which includes a timing controller, a power management circuit, and a source drive circuit. The timing controller is configured to receive image data to be displayed, determine whether the image data includes crosstalk, and issue a voltage modification command when the image data includes crosstalk. The power management circuit is connected to the timing controller and is configured to increase the output analog power supply voltage according to the voltage modification command. The source drive circuit is connected to the power management circuit and is configured to output a corresponding data signal according to the analog power supply voltage.

[0007] Secondly, this application provides a display driving method, which includes: a timing controller receiving image data to be displayed, determining whether the image data includes crosstalk, and issuing a voltage modification command when the image data includes crosstalk; a power management circuit increasing the output analog power supply voltage according to the voltage modification command; and a source drive circuit outputting a corresponding data signal according to the analog power supply voltage.

[0008] The display device and display driving method provided in this application receive image data to be displayed through a timing controller, determine whether the image data includes crosstalk, and issue a voltage modification command when the image data includes crosstalk. The power management circuit increases the output analog power supply voltage according to the voltage modification command, and the source drive circuit outputs a corresponding data signal according to the analog power supply voltage. When displaying crosstalk, the analog power supply voltage connected to the source drive circuit can be increased, reducing the drop in gamma voltage and thus reducing the drop in data signal. In this way, the crosstalk is improved by modifying parameters without increasing hardware costs, thereby reducing or avoiding negative effects while improving the crosstalk. Attached Figure Description

[0009] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0010] Figure 1 This is a schematic diagram of crosstalk in related technologies.

[0011] Figure 2 This is a schematic diagram of voltage changes corresponding to crosstalk in related technologies.

[0012] Figure 3 This is a schematic diagram of a first structure of a display device provided in an embodiment of this application.

[0013] Figure 4 This is a schematic diagram of a second structure of the display device provided in an embodiment of this application.

[0014] Figure 5 This is a schematic diagram of voltage changes corresponding to the crosstalk screen provided in the embodiments of this application.

[0015] Figure 6 This is a flowchart illustrating the display driving method provided in an embodiment of this application. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0017] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Features thus defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more unless otherwise explicitly specified.

[0018] Please see Figure 1 and Figure 2 ,like Figure 1 As shown, the crosstalk screen P10 includes a first region P11 and a second region P12. The second region P12 may surround the first region P11, and the first region P11 may be adjacent to the second region P12.

[0019] Figure 1 The middle left figure exemplarily shows that all gray levels in the first region P11 are L0, and all gray levels in the second region P12 are L127. Figure 1 The right-hand image exemplifies that all gray levels in the first region P11 are L255, and all gray levels in the second region P12 are L127.

[0020] The crosstalk image P10 appears because the load on the panel is heavy, and the trace impedance of the analog power supply voltage AVDD is high. When the level of the data signal DS is switched drastically, the instantaneous current of the analog power supply voltage AVDD (taking full positive voltage drive as an example) connected to the source drive circuit 300 increases, and a large voltage drop occurs between the near and far ends of the trace of the analog power supply voltage AVDD. This can easily cause the output voltage of the source drive circuit 300 to drop, resulting in lateral crosstalk in the image, thus forming the crosstalk image P10.

[0021] The mechanism of crosstalk screen P10 is as follows: When displaying crosstalk screen P10, the grayscale voltage of the large-area display area undergoes a significant change, causing an instantaneous increase in the current of the power supply to the source drive circuit 300, i.e., the analog power supply voltage AVDD. If the trace impedance for transmitting the analog power supply voltage AVDD between the output terminal of the power management circuit 200 and the input terminal of the source drive circuit 300 is large, the voltage drop will increase accordingly.

[0022] If the voltage drop is greater than the voltage difference between the analog power supply voltage AVDD connected to the source drive circuit 300 and the first gamma voltage, GMA1, the voltage of the data signal DS output by the source drive circuit 300 will drop, resulting in crosstalk screen P10. Figure 2As shown, when crosstalk occurs at the position of the data line DL in the grayscale L127 region, the analog power supply voltage AVDD drops, causing the gamma voltage (GMA) generated by the source drive circuit 300 based on the analog power supply voltage AVDD to drop synchronously, which in turn causes the voltage of the corresponding data signal DS to drop as well, resulting in the brightness of the corresponding horizontal line being darker than other positions.

[0023] The source drive circuit 300 can generate multiple gamma voltages based on the analog power supply voltage AVDD, and the first gamma voltage is the highest among these multiple gamma voltages.

[0024] To mitigate the aforementioned crosstalk, the following techniques are employed:

[0025] 1. Add a capacitor to the trace transmitting the analog power supply voltage AVDD. This method increases the cost of capacitors and other materials, increases the area of ​​the printed circuit board (PCB), and the effect is not significant.

[0026] 2. Increase the thrust of the source drive circuit 300. This method will increase panel power consumption and increase the heat generation of the source drive circuit 300.

[0027] 3. Increase the voltage difference between the analog power supply voltage AVDD and GMA1. This method will increase power consumption and increase the heat generated by the inductor in the DC-DC converter circuit.

[0028] Based on the above analysis, it can be seen that although the above method improves the crosstalk image P10, it also brings some of the negative effects mentioned above.

[0029] This embodiment provides a display device; please refer to [link / reference]. Figures 3 to 5 ,like Figure 3 As shown, the display device includes a timing controller 100, a power management circuit 200, and a source drive circuit 300. The timing controller 100 is configured to receive image data DIN to be displayed, determine whether the image data DIN includes crosstalk screen P10, and issue a voltage modification command CMD1 when the image data DIN includes crosstalk screen P10. The power management circuit 200 is connected to the timing controller 100 and is configured to increase the output analog power supply voltage AVDD according to the voltage modification command CMD1. The source drive circuit 300 is connected to the power management circuit 200 and is configured to output a corresponding data signal DS according to the analog power supply voltage AVDD.

[0030] It is understood that the display device provided in this embodiment receives the image data DIN to be displayed through the timing controller 100, determines whether the image data DIN includes the crosstalk screen P10, and issues a voltage modification command CMD1 when the image data DIN includes the crosstalk screen P10. The power management circuit 200 increases the output analog power supply voltage AVDD according to the voltage modification command CMD1, and the source drive circuit 300 outputs the corresponding data signal DS according to the analog power supply voltage AVDD. When displaying the crosstalk screen P10, the analog power supply voltage AVDD connected to the source drive circuit 300 can be increased, reducing the drop in gamma voltage, thereby reducing the drop in data signal DS. In this way, the crosstalk screen P10 is improved by parameter modification without increasing hardware costs, and thus the negative effects are reduced while improving the crosstalk screen P10.

[0031] It should be noted that in the crosstalk screen P10, the second region P12 may, but is not limited to, surround the first region P11, and the first region P11 may also be connected to the second region P12. The timing controller 100 can receive the image data DIN to be displayed, and determine whether the image data DIN includes the crosstalk screen P10 based on the screen detection function, i.e., PDF, and whether the image data DIN includes the crosstalk screen P10.

[0032] The display device can be a laptop, tablet, or other electronic device with a heavy in-plane load. The power management circuit 200 can be a printed circuit board or a power management chip (PMIC). The source driver circuit 300 can be a printed circuit board or a source driver chip.

[0033] In some of these embodiments, such as Figure 4 As shown, the display device also includes a display panel 400 connected to the source drive circuit 300. The display panel 400 includes an array of sub-pixels, which have corresponding column and row numbers.

[0034] In some of these embodiments, such as Figure 4 As shown, the power management circuit 200 includes a register 201, which stores voltage data. The voltage data can be used in the power management circuit 200 to adjust the analog power supply voltage AVDD.

[0035] In some of these embodiments, such as Figure 5 As shown, the crosstalk image P10 includes a first region P11 and a second region P12. The difference in gray levels between the first region P11 and the second region P12 is greater than a preset data.

[0036] It should be noted that the difference in gray levels is the difference between the gray levels of the first region P11 and the gray levels of the second region P12. The gray level of the first region P11 can be the average of all gray levels in the first region P11, or all gray levels in the first region P11 are equal. The gray level of the second region P12 can be the average of all gray levels in the second region P12, or all gray levels in the second region P12 are equal.

[0037] The preset data can be greater than or equal to 48. If the preset data is too small, it may not constitute a crosstalk image P10. The larger the preset data, the higher the accuracy of identifying crosstalk image P10. For example, the grayscale of the first region P11 can be L0 or L255, and the grayscale of the second region P12 can be L127. Then the difference in grayscale can be 127 or 128, both of which are greater than 48.

[0038] In some embodiments, the grayscale change of the sub-pixel corresponding to the first region P11 is greater than a preset grayscale, and the grayscale change is the difference between the grayscale of the sub-pixel in the crosstalk image P10 and the grayscale of the sub-pixel in the previous frame.

[0039] It should be noted that the preset grayscale can be greater than or equal to L30. For example, if the grayscale of the sub-pixel corresponding to the first region P11 in the previous frame is L0 or L255, and the grayscale of the sub-pixel corresponding to the first region P11 in the current frame is L127, then the grayscale change of the sub-pixel corresponding to the first region P11 is L127 or L128. The preset grayscale is used to determine whether a grayscale jump has occurred in the sub-pixel corresponding to the first region P11. A preset grayscale that is too small will reduce the accuracy of grayscale jump detection; a preset grayscale that is too large may miss some grayscale jumps, reducing the accuracy of judging crosstalk P10.

[0040] In some embodiments, the number of columns corresponding to the sub-pixels in the first region P11 is the first column number, the number of columns corresponding to the sub-pixels in the second region P12 is the second column number, the ratio of the first column number to the third column number is greater than or equal to a preset ratio, and the third column number is the sum of the first column number and the second column number.

[0041] It should be noted that the third column number can be the total number of columns of the 400 sub-pixels in the display panel. The default ratio can be 1 / 3.

[0042] In some embodiments, the operation phases of the display device include a display phase for displaying image data DIN and a blank phase between the display phases, and the power management circuit 200 is configured to increase the output analog power supply voltage AVDD in the blank phase according to the voltage modification instruction CMD1.

[0043] It should be noted that the display phase can display the corresponding screen based on the image data DIN. The blanking phase does not display the corresponding screen based on the image data DIN. The display phase and the blanking phase can alternate.

[0044] In some of these embodiments, such as Figure 3 , Figure 4 As shown, the power management circuit 200 is configured to adjust the voltage data according to the voltage modification instruction CMD1 to increase the analog power supply voltage AVDD.

[0045] It should be noted that each voltage data point corresponds to an analog power supply voltage AVDD. When the voltage data changes, the analog power supply voltage AVDD also changes accordingly.

[0046] In some embodiments, the timing controller 100 is configured to issue a voltage recovery command CMD2 when it identifies a frame other than the crosstalk frame P10 from the image data DIN, the power management circuit 200 is configured to restore the enhanced analog power supply voltage AVDD according to the voltage recovery command CMD2, and the source drive circuit 300 is configured to output the corresponding data signal DS according to the restored analog power supply voltage AVDD.

[0047] It should be noted that the screen outside of crosstalk screen P10 can be regarded as a normal screen. In this case, the increased analog power supply voltage AVDD is reduced back to the original value. This application only increases the analog power supply voltage AVDD in the case of crosstalk screen P10. Compared with increasing the thrust of the source drive circuit 300 or the voltage difference between the analog power supply voltage AVDD and GMA1, which requires a continuous increase in power consumption, power consumption can be reduced.

[0048] like Figure 5 As shown, when crosstalk occurs at the position of data line DL in the grayscale L127 region, the analog power supply voltage AVDD is increased. Even if there is a drop, it only drops to the level before the increase. This means that the gamma voltage (GMA) generated by the source drive circuit 300 based on the analog power supply voltage AVDD does not drop synchronously, and the voltage of the corresponding data signal DS can also remain stable, thereby improving the crosstalk image P10.

[0049] In some embodiments, this embodiment provides a display driving method, such as... Figure 6 As shown, the display driving method includes the following steps:

[0050] Step S10: When the timing controller identifies crosstalk screen P10 from the image data, it issues a voltage modification command.

[0051] Step S20: The power management circuit increases the output analog power supply voltage according to the voltage modification instruction.

[0052] Step S30: The source drive circuit outputs the corresponding data signal according to the analog power supply voltage.

[0053] It is understood that the display driving method provided in this embodiment receives the image data DIN to be displayed through the timing controller 100, determines whether the image data DIN includes the crosstalk screen P10, and issues a voltage modification command CMD1 when the image data DIN includes the crosstalk screen P10. The power management circuit 200 increases the output analog power supply voltage AVDD according to the voltage modification command CMD1, and the source drive circuit 300 outputs the corresponding data signal DS according to the analog power supply voltage AVDD. When displaying the crosstalk screen P10, the analog power supply voltage AVDD connected to the source drive circuit 300 can be increased, reducing the drop in gamma voltage, thereby reducing the drop in data signal DS. In this way, the crosstalk screen P10 is improved by parameter modification without increasing hardware costs, and thus the negative effects are reduced while improving the crosstalk screen P10.

[0054] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0055] The display device and display driving method provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A display device, characterized in that, The display device includes: A timing controller is configured to receive image data to be displayed, determine whether the image data includes crosstalk, and issue a voltage modification command when the image data includes the crosstalk. A power management circuit, connected to the timing controller, is configured to increase the output analog power supply voltage during a blanking phase according to the voltage modification command; the operating phases of the display device include a display phase and the blanking phase located between the display phases; A source drive circuit is connected to the power management circuit and is configured to output a corresponding data signal according to the analog power supply voltage. The timing controller is further configured to issue a voltage recovery command when it identifies a frame other than the crosstalk frame from the image data, and the power management circuit is further configured to restore the boosted analog power supply voltage according to the voltage recovery command. The crosstalk image includes a first region and a second region, the difference in gray levels between the first region and the second region is greater than a preset data, the display device includes a display panel connected to the source driving circuit, the display panel includes sub-pixels distributed in an array, the gray level change of the sub-pixel corresponding to the first region is greater than a preset gray level, and the gray level change is the difference between the gray level of the sub-pixel in the crosstalk image and the gray level of the sub-pixel in the previous frame.

2. The display device according to claim 1, characterized in that, The number of columns corresponding to the sub-pixels in the first region is the first column number, the number of columns corresponding to the sub-pixels in the second region is the second column number, the ratio of the first column number to the third column number is greater than or equal to a preset ratio, and the third column number is the sum of the first column number and the second column number.

3. The display device according to claim 1, characterized in that, The second region surrounds the first region.

4. The display device according to claim 1, characterized in that, The power management circuit includes a register that stores voltage data, and the power management circuit is configured to adjust the voltage data according to the voltage modification instruction to increase the analog power supply voltage.

5. The display device according to any one of claims 1-4, characterized in that, The source drive circuit is configured to output a corresponding data signal based on the recovered analog power supply voltage.

6. A display driving method, characterized in that, The display driving method includes: The timing controller receives the image data to be displayed, determines whether the image data includes crosstalk, and issues a voltage modification command when the image data includes the crosstalk. The power management circuit increases the output analog power supply voltage during the blanking phase according to the voltage modification command; the operating phase of the display device includes a display phase and the blanking phase located between the display phases; The source drive circuit outputs a corresponding data signal based on the analog power supply voltage; When the timing controller identifies a frame outside the crosstalk frame from the image data, it issues a voltage recovery command; the power management circuit restores the boosted analog power supply voltage according to the voltage recovery command. The crosstalk image includes a first region and a second region, the difference in gray levels between the first region and the second region is greater than a preset data, the display device includes a display panel connected to the source driving circuit, the display panel includes sub-pixels distributed in an array, the gray level change of the sub-pixel corresponding to the first region is greater than a preset gray level, and the gray level change is the difference between the gray level of the sub-pixel in the crosstalk image and the gray level of the sub-pixel in the previous frame.

7. The display driving method according to claim 6, characterized in that, The display driving method further includes: The source drive circuit outputs a corresponding data signal based on the restored analog power supply voltage.

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