Driving method, driving device and display driving chip of display panel

Abstract

This invention discloses a driving method, driving device, and display driving chip for a display panel. By determining a first reference voltage and a second reference voltage corresponding to the maximum gray level of the display panel according to target display parameters, the absolute value of the difference between the first reference voltage and the second reference voltage corresponding to the maximum gray level is minimized while meeting the target display parameters. The first reference voltage and the second reference voltage can ensure that the display panel can meet the display parameter requirements of the highest and lowest gray levels of the maximum gray level, while ensuring that the voltage range corresponding to the maximum gray level is minimized. This prevents situations where black states are not black or brightness cannot be adjusted. At the same time, it can improve the precision of data voltage adjustment, allowing for more refined gray level expansion, thereby improving the gray level performance of the display panel and enhancing the display effect.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a driving method, driving device, and display driver chip for a display panel. Background Technology

[0002] With the development of display technology, users have increasingly higher requirements for image display quality, and good display performance at various gray levels has become more important.

[0003] Due to resource limitations of the Display Driver IC (DDIC), gamma adjustment does not fully cover all nodes. The adjustment of gamma voltage between nodes is implemented using an internal algorithm within the DDIC, making the gamma voltage range setting a major factor affecting the display of each grayscale level. In existing technologies, the upper and lower limits of the gamma voltage are fixed for different display panels, and the gamma voltage range is usually set the same. However, this fixed setting of the upper and lower limits of the gamma voltage is not applicable to all display panels; therefore, some display panels exhibit poor display performance. Summary of the Invention

[0004] This invention provides a driving method, driving device, and display driving chip for a display panel to improve the display effect of the display panel.

[0005] In a first aspect, embodiments of the present invention provide a method for driving a display panel, comprising:

[0006] The first reference voltage and the second reference voltage corresponding to the maximum gray level of the display panel are determined according to the target display parameters, so that the absolute value of the difference between the first reference voltage and the second reference voltage corresponding to the maximum gray level is minimized under the premise of satisfying the target display parameters. The maximum gray level is the lowest to the highest gray level that the display panel can display.

[0007] The data voltages corresponding to each gray level within the maximum gray level of the display panel are determined based on the first and second reference voltages corresponding to the maximum gray level.

[0008] Optionally, the target display parameters include a first target brightness and a first target color coordinate corresponding to a first set gray level, and a second target brightness and a second target color coordinate corresponding to a second set gray level; or, the target display parameters include a first target color coordinate corresponding to a first set gray level, a second target brightness and a second target color coordinate corresponding to a second set gray level, and a target contrast ratio, wherein the first target brightness corresponding to the first set gray level is determined by the second target brightness and the target contrast ratio.

[0009] Optionally, the first reference voltage and the second reference voltage corresponding to the maximum grayscale level of the display panel are determined based on the target display parameters, including:

[0010] Under the condition that the first set screen is displayed on the display panel, the first voltage value corresponding to the first reference voltage is gradually increased from the first initial set voltage, and the data voltage corresponding to each color sub-pixel in the display panel is adjusted under each first voltage value. The first voltage value that first meets the requirements of the first target brightness and the first target color coordinate is determined as the first reference voltage corresponding to the maximum gray stage.

[0011] Under the condition that the second setting screen is displayed on the display panel, the second voltage value corresponding to the second reference voltage is gradually reduced starting from the second initial setting voltage, and the data voltage corresponding to each color sub-pixel in the display panel is adjusted at each second voltage value. The second voltage value that first meets the requirements of the second target brightness and the second target color coordinates is determined as the second reference voltage corresponding to the maximum gray stage.

[0012] The first grayscale setting is the lowest grayscale of the maximum grayscale stage, and the first screen setting is a black screen; the second grayscale setting is the highest grayscale of the maximum grayscale stage, and the second screen setting is a white screen.

[0013] Optionally, the data voltage corresponding to each gray level within the maximum gray stage of the display panel is determined based on the first reference voltage and the second reference voltage corresponding to the maximum gray stage, including:

[0014] Gamma adjustment is performed based on the first reference voltage and the second reference voltage to determine the gamma register values ​​corresponding to at least a portion of the grayscale levels;

[0015] The data voltage corresponding to the gray level segment point is determined based on the gamma register value of the gray level segment point corresponding to the preset gray level within the maximum gray level, and is stored as the first reference voltage or the second reference voltage corresponding to the preset gray level. The maximum gray level and each preset gray level within the maximum gray level correspond to a pair of first and second reference voltages, respectively. The first reference voltage is the highest voltage corresponding to the corresponding gray level, and the second reference voltage is the lowest voltage corresponding to the corresponding gray level. The gamma registers corresponding to the maximum gray level and each preset gray level within the maximum gray level have the same number of bits.

[0016] Based on the first reference voltage and the second reference voltage corresponding to the gray stage to which the target gray level of each sub-pixel belongs in the display sub-regions divided by the display panel, the data voltage corresponding to the sub-pixel in the display sub-regions is determined, wherein the display panel is divided into at least one display sub-region.

[0017] Optionally, the gray stage includes multiple first gray stages from the lowest gray level within the maximum gray stage to the gray level segmentation point; the data voltage corresponding to the gray level segmentation point is determined based on the gamma register value of the gray level segmentation point corresponding to the preset gray stage within the maximum gray stage, and is stored as the first reference voltage or the second reference voltage corresponding to the preset gray stage, including:

[0018] The first reference voltage corresponding to the maximum gray stage is used as the first reference voltage corresponding to each first gray stage within the maximum gray stage.

[0019] The data voltage corresponding to each color sub-pixel at the grayscale segment point is determined based on the gamma register value corresponding to each preset grayscale segment point.

[0020] The smallest data voltage among the preset grayscale segment points for each color sub-pixel is used as the second reference voltage corresponding to the first grayscale stage and stored.

[0021] Optionally, the gray stage includes multiple second gray stages from the gray level segmentation point to the highest gray level within the maximum gray stage; the data voltage corresponding to the gray level segmentation point is determined based on the gamma register value of the gray level segmentation point corresponding to the preset gray stage within the maximum gray stage, and is stored as the first reference voltage or the second reference voltage corresponding to the preset gray stage, including:

[0022] The second reference voltage corresponding to the maximum gray stage is used as the second reference voltage corresponding to each second gray stage within the maximum gray stage.

[0023] The data voltage corresponding to each color sub-pixel at the grayscale segment point is determined based on the gamma register value corresponding to each preset grayscale segment point.

[0024] The largest value among the data voltages corresponding to the preset grayscale segment points of each color sub-pixel is used as the first reference voltage for the corresponding second grayscale stage and stored.

[0025] Optionally, the gray stage also includes intermediate gray stages between adjacent gray level segmentation points;

[0026] The data voltage corresponding to the gray level segment point is determined based on the gamma register value of the gray level segment point corresponding to the preset gray level within the maximum gray level, and is stored as the first reference voltage or the second reference voltage corresponding to the preset gray level. The method also includes:

[0027] For the intermediate gray stage, the smallest data voltage of each color sub-pixel corresponding to the smaller gray level segment point is used as the first reference voltage of the corresponding intermediate gray stage and stored; the largest data voltage of each color sub-pixel corresponding to the larger gray level segment point is used as the second reference voltage of the corresponding intermediate gray stage and stored.

[0028] Optionally, based on the first and second reference voltages corresponding to the gray levels of each sub-pixel in the display sub-regions divided by the display panel, the data voltage corresponding to the sub-pixel in the display sub-regions is determined, including:

[0029] Determine the maximum target gray level among the target gray levels of each sub-pixel in the display sub-region;

[0030] The data voltage corresponding to each sub-pixel in the display sub-region is determined based on the first reference voltage and the second reference voltage corresponding to the first gray stage to which the maximum target gray level belongs.

[0031] Among them, the first gray stage to which the maximum target gray level belongs is the first gray stage in which the gray level of the gray level segment point is greater than or equal to the maximum target gray level and the absolute value of the difference between the gray level and the maximum target gray level is the smallest.

[0032] Optionally, based on the first and second reference voltages corresponding to the gray levels of each sub-pixel in the display sub-regions divided by the display panel, the data voltage corresponding to the sub-pixel in the display sub-regions is determined, including:

[0033] Determine the minimum target gray level among the target gray levels of each sub-pixel in the display sub-region;

[0034] The data voltage corresponding to each sub-pixel in the display sub-region is determined based on the first reference voltage and the second reference voltage corresponding to the second gray stage to which the minimum target gray level belongs.

[0035] Among them, the second gray stage to which the minimum target gray level belongs is the second gray stage in which the gray level of the gray level segment point is less than or equal to the minimum target gray level, and the absolute value of the difference between the gray level and the minimum target gray level is the smallest.

[0036] Optionally, based on the first and second reference voltages corresponding to the gray levels of each sub-pixel in the display sub-regions divided by the display panel, the data voltage corresponding to the sub-pixel in the display sub-regions is determined, including:

[0037] Determine the maximum and minimum target gray levels among the target gray levels of each sub-pixel in the display sub-region;

[0038] The data voltage corresponding to each sub-pixel in the display sub-region is determined based on the first reference voltage and the second reference voltage corresponding to the intermediate gray stages from the minimum target gray level to the maximum target gray level.

[0039] Among them, the intermediate gray stage from the minimum target gray level to the maximum target gray level is the smallest range of intermediate gray stages that includes the minimum target gray level to the maximum target gray level.

[0040] Secondly, embodiments of the present invention also provide a driving device for a display panel, comprising:

[0041] The reference voltage determination module is used to determine the first reference voltage and the second reference voltage corresponding to the maximum gray level of the display panel according to the target display parameters, so as to minimize the absolute value of the difference between the first reference voltage and the second reference voltage corresponding to the maximum gray level under the premise of satisfying the target display parameters. The maximum gray level is the lowest gray level to the highest gray level that the display panel can display.

[0042] The data voltage determination module is used to determine the data voltage corresponding to each gray level within the maximum gray stage of the display panel based on the first reference voltage and the second reference voltage corresponding to the maximum gray stage.

[0043] Thirdly, embodiments of the present invention also provide a display driver chip, including: at least one gamma circuit selection module, a storage module, and a comparison module; the storage module includes storage units corresponding one-to-one with the gamma circuit selection module;

[0044] The comparison module is electrically connected to each storage unit and is used to compare the target grayscale currently received with the target grayscale previously received in the storage unit and generate a comparison result.

[0045] The gamma circuit selection module is used to select the corresponding first reference voltage and / or second reference voltage based on the comparison result.

[0046] Optionally, the comparison module is used to generate a first comparison result when the target gray level received in the current time and the target gray level received in the previous time belong to the same gray level in the storage unit, so that the corresponding gamma circuit selection module does not operate.

[0047] The comparison module is used to generate a second comparison result when the target gray level received in the current time and the target gray level received in the previous time belong to different gray stages in the storage unit, so as to make the corresponding selection module act to switch the first reference voltage and / or the second reference voltage.

[0048] The target grayscale includes the target grayscale corresponding to each sub-pixel in a frame of the display.

[0049] Optionally, the storage unit includes a first storage area and a second storage area, which are communicatively connected; the display driver chip also includes a storage control module, which is communicatively connected to the first storage area and the second storage area respectively, and is used to control the alternating transmission of target grayscale to the first storage area and the second storage area.

[0050] Optionally, the display driver chip includes multiple first reference voltage sources and / or multiple second reference voltage sources; the display driver chip also includes a gamma circuit, which includes a resistor string;

[0051] The gamma circuit selection module also includes a first selection unit, which is used to select the corresponding first reference voltage source to be connected to the first terminal of the gamma circuit according to the comparison result.

[0052] The and / or gamma circuit selection module also includes a second selection unit, which is used to select the corresponding second reference voltage source to be connected to the second terminal of the gamma circuit according to the comparison result;

[0053] Optionally, both the first selection unit and the second selection unit may further include a multiplexer switch.

[0054] The driving method for the display panel in this embodiment of the invention determines a first reference voltage and a second reference voltage corresponding to the maximum gray level of the display panel based on the target display parameters. This minimizes the absolute value of the difference between the first reference voltage and the second reference voltage corresponding to the maximum gray level while satisfying the target display parameters. The first reference voltage and the second reference voltage ensure that the display panel can meet the display parameter requirements of the highest and lowest gray levels of the maximum gray level, while minimizing the voltage range corresponding to the maximum gray level. This prevents situations where blacks are not black enough or the brightness cannot be adjusted. At the same time, it improves the precision of data voltage adjustment, allowing for more refined gray level expansion, thereby improving the gray level performance of the display panel and enhancing the display effect. Attached Figure Description

[0055] Figure 1 This is a flowchart of a driving method for a display panel provided in an embodiment of the present invention;

[0056] Figure 2 This is a flowchart of another display panel driving method provided in an embodiment of the present invention;

[0057] Figure 3 This is a flowchart of a method for determining the data voltage corresponding to each gray level within the maximum gray stage, provided by an embodiment of the present invention.

[0058] Figure 4 This is a flowchart of another display panel driving method provided in an embodiment of the present invention;

[0059] Figure 5 This is a flowchart of another display panel driving method provided in an embodiment of the present invention;

[0060] Figure 6 This is a flowchart of another display panel driving method provided in an embodiment of the present invention;

[0061] Figure 7 This is a schematic diagram of the structure of a driving device for a display panel provided in an embodiment of the present invention;

[0062] Figure 8This is a schematic diagram of the structure of a display driver chip provided in an embodiment of the present invention;

[0063] Figure 9 This is a schematic diagram of the structure of a gamma circuit selection module provided in an embodiment of the present invention;

[0064] Figure 10 This is a schematic diagram of another gamma circuit selection module provided in an embodiment of the present invention. Detailed Implementation

[0065] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0066] As described in the background section, in the prior art, the upper and lower limits of the gamma voltage are fixed for different display panels, and the gamma voltage range is usually set the same. However, this fixed setting of the upper and lower limits of the gamma voltage is not applicable to all display panels. Therefore, some display panels exhibit poor display performance. The reason for this problem is that the size of the gamma voltage range affects the precision of data voltage adjustment. In the prior art, to meet the display requirements of different display panels and enable them to display the target brightness corresponding to the highest and lowest gray levels, the gamma voltage range is usually set relatively large. This means that the lowest reference voltage (VGSP) corresponding to the gamma voltage range is set relatively small, and the highest reference voltage (VGMP) corresponding to the gamma voltage range is set relatively large. However, a large gamma voltage range is not suitable for all display panels. For a specific display panel, setting the gamma voltage range too large will result in insufficient precision in data voltage adjustment, making it impossible to obtain the target data voltage corresponding to the target brightness for displaying certain gray levels. In other words, some gray levels cannot be expanded, resulting in poor display performance of the display panel in certain gray levels. Furthermore, setting the highest reference voltage relatively high and the lowest reference voltage relatively low may result in blacks not being truly black and inability to adjust the brightness.

[0067] For the reasons mentioned above, embodiments of the present invention provide a driving method for a display panel. Figure 1 This is a flowchart of a display panel driving method provided in an embodiment of the present invention, see reference. Figure 1 The driving method for this display panel includes:

[0068] Step 110: Determine the first reference voltage and the second reference voltage corresponding to the maximum gray level of the display panel according to the target display parameters, so that the absolute value of the difference between the first reference voltage and the second reference voltage corresponding to the maximum gray level is minimized under the premise of satisfying the target display parameters. The maximum gray level is the lowest to the highest gray level that the display panel can display.

[0069] The target display parameters can be the display parameters for the highest and lowest grayscale levels that the display panel can display. The grayscale range corresponding to the highest grayscale level that the display panel can display is the corresponding maximum grayscale level of the display panel. One of the first reference voltage and the second reference voltage is determined by the display parameter for the lowest grayscale level that the display panel can display, and the other is determined by the display parameter for the highest grayscale level that the display panel can display. For example, the first reference voltage is determined by the display parameter for the lowest grayscale level that the display panel can display, and the second reference voltage is determined by the display parameter for the highest grayscale level that the display panel can display. Therefore, when the driving transistor of the pixel circuit in the display panel is a P-type transistor, the first reference voltage is the highest voltage corresponding to the maximum grayscale level, and the second reference voltage is the lowest voltage corresponding to the maximum grayscale level; when the driving transistor of the pixel circuit in the display panel is an N-type transistor, the first reference voltage is the lowest voltage corresponding to the maximum grayscale level, and the second reference voltage is the highest voltage corresponding to the maximum grayscale level.

[0070] In this step, a first reference voltage and a second reference voltage corresponding to the maximum grayscale level of the display panel are determined based on the target display parameters. This ensures that, while meeting the target display parameters, the absolute value of the difference between the first reference voltage and the second reference voltage corresponding to the maximum grayscale level is minimized, thus minimizing the voltage range (i.e., the gamma voltage range) corresponding to the maximum grayscale level. In other words, in this embodiment, the first reference voltage and the second reference voltage ensure that the display panel meets the display parameter requirements for the highest and lowest grayscale levels of the maximum grayscale level while minimizing the voltage range corresponding to the maximum grayscale level.

[0071] Step 120: Determine the data voltage corresponding to each gray level within the maximum gray stage of the display panel based on the first reference voltage and the second reference voltage corresponding to the maximum gray stage.

[0072] Specifically, in this step, when performing gamma adjustment, the data voltage corresponding to at least some gray levels can be determined based on the first reference voltage and the second reference voltage, such as the data voltage corresponding to the bound point gray level, and then the data voltage corresponding to other gray levels can be obtained based on the data voltage corresponding to the bound point gray level.

[0073] The driving method for the display panel in this embodiment determines a first reference voltage and a second reference voltage corresponding to the maximum gray level of the display panel based on the target display parameters. This minimizes the absolute value of the difference between the first reference voltage and the second reference voltage corresponding to the maximum gray level while meeting the target display parameters. The first reference voltage and the second reference voltage ensure that the display panel can meet the display parameter requirements of the highest and lowest gray levels of the maximum gray level, while minimizing the voltage range corresponding to the maximum gray level. This prevents situations where blacks are not black enough or the brightness cannot be adjusted. At the same time, it improves the precision of data voltage adjustment, allowing for more refined gray level expansion, which in turn helps improve the gray level performance of the display panel and enhances the display effect.

[0074] In an optional embodiment of the present invention, the target display parameters include a first target brightness and a first target color coordinate corresponding to a first set gray level, and a second target brightness and a second target color coordinate corresponding to a second set gray level.

[0075] In another optional embodiment of the present invention, the target display parameters include the first target color coordinates corresponding to the first set gray level, the second target brightness and the second target color coordinates corresponding to the second set gray level, and the target contrast ratio. The first target brightness corresponding to the first set gray level is determined by the second target brightness and the target contrast ratio.

[0076] When the target display parameters include the first target color coordinates corresponding to the first set grayscale, the second target brightness and second target color coordinates corresponding to the second set grayscale, and the target contrast ratio, the first target brightness corresponding to the first set grayscale can be calculated first based on the second target brightness and the target contrast ratio. One of the first set grayscale and the second set grayscale is the lowest grayscale of the maximum grayscale range, and the other is the highest grayscale of the maximum grayscale range. Specifically, when the first target brightness corresponds to the minimum brightness and the second target brightness corresponds to the maximum brightness, the first target brightness is less than the ratio of the second target brightness to the target contrast ratio; when the first target brightness corresponds to the maximum brightness and the second target brightness corresponds to the minimum brightness, the first target brightness is greater than the product of the second target brightness and the target contrast ratio.

[0077] In the following embodiments of the present invention, the case where the driving transistors included in the pixel circuit of the display panel are P-type transistors is used for explanation, that is, the higher the gray level, the smaller the data voltage, and the lower the gray level, the larger the data voltage. For example, if the first set gray level corresponds to the lowest gray level of the maximum gray stage, then the data voltage corresponding to the first set gray level is the largest within the maximum gray stage; if the second set gray level corresponds to the highest gray level of the maximum gray stage, then the data voltage corresponding to the second set gray level is the smallest within the maximum gray stage.

[0078] Figure 2This is a flowchart of another display panel driving method provided in an embodiment of the present invention, see reference. Figure 2 The driving method for this display panel includes:

[0079] Step 210: Under the condition that the first setting screen is displayed on the display panel, gradually increase the first voltage value corresponding to the first reference voltage starting from the first initial setting voltage, and adjust the data voltage corresponding to each color sub-pixel in the display panel at each first voltage value, and determine the first voltage value that first meets the requirements of the first target brightness and the first target color coordinates as the first reference voltage corresponding to the maximum gray stage.

[0080] In this embodiment, the first set gray level is the lowest gray level of the maximum gray stage, and the first set screen is a black screen. The first voltage value is the voltage value corresponding to the continuously changing first reference voltage during the determination of the first reference voltage. In this step, the display panel can be controlled to display a black screen. The initial value of the first reference voltage is set to the first initial set voltage. Then, the brightness and contrast data of the display panel are collected by a color analyzer. If the requirements are not met, the first voltage value corresponding to the first reference voltage is gradually increased based on the first initial set voltage. At each first voltage value, the data voltage corresponding to each color sub-pixel (e.g., red, green, and blue sub-pixels) in the display panel is adjusted. After each adjustment of the data voltage, the brightness and color coordinate data of the display panel are collected by the color analyzer until a first voltage value that meets the requirements of the first target brightness and the first target color coordinates is found. The first voltage value that first meets the requirements of the first target brightness and the first target color coordinates is determined as the first reference voltage corresponding to the maximum gray stage. This ensures that the obtained first reference voltage has the minimum voltage value under the condition of meeting the requirements of the first target brightness and the first target color coordinates. In this step, the brightness and color coordinate requirements of the black screen can be met by adjusting the first voltage value corresponding to the first reference voltage, which can avoid the phenomenon that the black state of the display panel is not black due to the first reference voltage being set too low.

[0081] Step 220: Under the condition that the second setting screen is displayed on the display panel, gradually decrease the second voltage value corresponding to the second reference voltage starting from the second initial setting voltage, and adjust the data voltage corresponding to each color sub-pixel in the display panel at each second voltage value, and determine the second voltage value that first meets the requirements of the second target brightness and the second target color coordinates as the second reference voltage corresponding to the maximum gray stage.

[0082] Among them, the second gray level setting is the highest gray level of the maximum gray stage, and the second screen setting is a white screen.

[0083] In this embodiment, the second voltage value is the voltage value corresponding to the continuously changing second reference voltage during the determination of the second reference voltage. In this step, the initial value of the second reference voltage can be set to a second initial setting voltage by controlling the display panel to display a white screen. Then, the brightness and contrast data of the display panel are collected by a color analyzer. If the requirements are not met, the second voltage value corresponding to the second reference voltage is gradually reduced based on the second initial setting voltage. At each second voltage value, the data voltage corresponding to each color sub-pixel (e.g., red sub-pixel, green sub-pixel, and blue sub-pixel) in the display panel is adjusted. After each adjustment of the data voltage, the brightness and color coordinate data of the display panel are collected by the color analyzer until a second voltage value that can meet the requirements of the second target brightness and the second target color coordinates is found. The second voltage value that first meets the requirements of the second target brightness and the second target color coordinates is determined as the second reference voltage corresponding to the maximum gray stage. This ensures that the obtained second reference voltage has the maximum voltage value under the condition of meeting the requirements of the second target brightness and the second target color coordinates. In this step, the brightness and color coordinate requirements of the white screen can be met by adjusting the second voltage value corresponding to the second reference voltage, which can avoid the problem of the display panel brightness not being able to be adjusted due to the second reference voltage being set too high.

[0084] Step 230: Determine the data voltage corresponding to each gray level within the maximum gray level of the display panel based on the first reference voltage and the second reference voltage corresponding to the maximum gray level; this step is the same as step 120 in the above embodiment, and will not be repeated here.

[0085] It should be noted that in this implementation, there is no restriction on the execution order of steps 210 and 220. Step 210 can be executed before step 220, or step 210 can be executed after step 220.

[0086] In this embodiment, since the voltage value of the first reference voltage obtained in step 210 is the minimum voltage value under the condition of satisfying the requirements of the first target brightness and the first target color coordinates, and the voltage value of the second reference voltage obtained in step 220 is the maximum voltage value under the condition of satisfying the requirements of the second target brightness and the second target color coordinates, it can be ensured that the absolute value of the difference between the first reference voltage and the second reference voltage corresponding to the maximum gray stage is minimized, that is, it can be ensured that the voltage range corresponding to the maximum gray stage is minimized. This ensures that the precision of adjusting the data voltage of other gray levels within the maximum gray stage according to the first reference voltage and the second reference voltage is high, so that the gray levels can be more finely expanded, which is beneficial to improving the gray level performance of the display panel and thus improving the display effect.

[0087] Figure 3This is a flowchart illustrating a method for determining the data voltage corresponding to each gray level within the maximum gray stage, provided in an embodiment of the present invention. (Reference) Figure 3 In the above embodiments, steps 120 and 230, determining the data voltage corresponding to each gray level within the maximum gray stage based on the first reference voltage and the second reference voltage corresponding to the maximum gray stage, can each include the following steps:

[0088] Step 310: Perform gamma adjustment based on the first reference voltage and the second reference voltage to determine the gamma register values ​​corresponding to at least a portion of the grayscale levels.

[0089] Specifically, this step is the same as the existing gamma adjustment process. Through gamma adjustment, the gamma register value corresponding to the set grayscale level is obtained. Because the absolute value of the difference between the first reference voltage and the second reference voltage is the smallest, the precision of the data voltage adjustment of the grayscale level can be guaranteed, so that the data voltage corresponding to the grayscale level can meet the brightness and color coordinate requirements of the grayscale level.

[0090] Step 320: Determine the data voltage corresponding to the gray level segment point based on the gamma register value of the gray level segment point corresponding to the preset gray level within the maximum gray level, and store it as the first reference voltage or the second reference voltage corresponding to the preset gray level; wherein, the maximum gray level and each preset gray level within the maximum gray level correspond to a pair of first reference voltage and second reference voltage, the first reference voltage is the highest voltage corresponding to the corresponding gray level, and the second reference voltage is the lowest voltage corresponding to the corresponding gray level; wherein, the maximum gray level and each preset gray level within the maximum gray level have the same number of gamma register bits.

[0091] The grayscale range included in the preset grayscale stage within the maximum grayscale stage is smaller than the grayscale range included in the maximum grayscale stage. When the grayscale segment point corresponding to the preset grayscale stage is equal to the bound point grayscale, the gamma register value corresponding to the grayscale segment point can be obtained from step 310; when the grayscale segment point corresponding to the preset grayscale stage is not equal to the bound point grayscale, the gamma register value corresponding to the grayscale segment point can be obtained based on the gamma register value corresponding to the bound point grayscale, for example, by interpolation calculation based on the gamma register value corresponding to the bound point grayscale. The data voltage corresponding to the grayscale segment point serves as the first reference voltage or the second reference voltage of the corresponding grayscale stage.

[0092] Step 330: Determine the data voltage corresponding to the sub-pixel in the display sub-region based on the first reference voltage and the second reference voltage corresponding to the gray stage to which the target gray level of each sub-pixel belongs in the display sub-region divided by the display panel, wherein the display panel is divided into at least one display sub-region.

[0093] Specifically, the display area of ​​the display panel can be divided into at least one display sub-region. When the display area is divided into one display sub-region, the display sub-region is the entire display area; when the display area is divided into two or more display sub-regions, the area of ​​each display sub-region is smaller than the area of ​​the display area. For any display sub-region, firstly, the gray stage to which the target gray level of each sub-pixel in the display sub-region belongs needs to be determined. Specifically, the gray stage to which the target gray level of each sub-pixel in the display sub-region belongs can be determined based on the minimum and / or maximum target gray levels among the target gray levels of each sub-pixel. Then, the data voltage corresponding to the sub-pixel in the display sub-region is determined based on the first and second reference voltages corresponding to the gray stage. Optionally, for any gray stage (including the maximum gray stage and the preset gray stages within the maximum gray stage), the data voltage corresponding to the sub-pixel can be calculated using the following formula.

[0094]

[0095] Where VGMP represents the highest voltage (first reference voltage) corresponding to the gray stage, VGSP represents the lowest voltage (second reference voltage) corresponding to the gray stage, DATA represents the register value corresponding to the gray level, and V data The value represents the data voltage corresponding to the grayscale level, and N represents the number of bits set in the registers inside the driver chip. In this embodiment, the number of bits in the gamma registers corresponding to the maximum grayscale level and each preset grayscale level within the maximum grayscale level is equal; that is, the N values ​​corresponding to the maximum grayscale level and each preset grayscale level within the maximum grayscale level are equal. Therefore, in this embodiment, the difference between the first reference voltage and the second reference voltage corresponding to the preset grayscale level within the maximum grayscale level is less than the difference between the first reference voltage and the second reference voltage corresponding to the maximum grayscale level. Thus, the technical solution of this embodiment can further improve the precision of data voltage adjustment within each preset grayscale level, thereby optimizing the grayscale transition effect and further enhancing the display effect.

[0096] In this embodiment, for each display sub-region, the data voltage corresponding to the sub-pixel in the display sub-region can be determined based on the first reference voltage and the second reference voltage corresponding to the gray level to which the target gray level of each sub-pixel in the display sub-region belongs. Therefore, the more display sub-regions the display area of ​​the display panel is divided into, the better the display effect will be.

[0097] In an optional embodiment of the present invention, the gray stage includes multiple first gray stages from the lowest gray level within the maximum gray stage to the gray level segmentation point. For example, the maximum gray stage includes gray levels 0-255, and the multiple first gray stages may include gray levels 0-32, 0-64, 0-128, 0-200, and 0-225.

[0098] Figure 4This is a flowchart of another display panel driving method provided in an embodiment of the present invention, see reference. Figure 4 The driving method for this display panel includes:

[0099] Step 410: Determine the first reference voltage and the second reference voltage corresponding to the maximum gray level of the display panel according to the target display parameters, so that the absolute value of the difference between the first reference voltage and the second reference voltage corresponding to the maximum gray level is minimized under the premise of satisfying the target display parameters. The maximum gray level is the lowest to the highest gray level that the display panel can display. This step is the same as step 110 in the above embodiment, and will not be described again here.

[0100] Step 420: Perform gamma adjustment based on the first reference voltage and the second reference voltage to determine the gamma register value corresponding to at least a portion of the gray levels; this step is the same as step 310 in the above embodiment, and will not be repeated here.

[0101] Step 430: Use the first reference voltage corresponding to the maximum gray stage as the first reference voltage corresponding to each first gray stage within the maximum gray stage.

[0102] In other words, in this embodiment, the first reference voltage corresponding to each first gray stage is equal to the first reference voltage corresponding to the maximum gray stage.

[0103] Step 440: Determine the data voltage corresponding to the grayscale segment point of each color sub-pixel based on the gamma register value corresponding to the preset grayscale segment point.

[0104] The display panel may include red, green, and blue sub-pixels. In this step, the data voltage corresponding to the red sub-pixel at the preset grayscale segment point is determined based on the gamma register value of the red sub-pixel at the preset grayscale segment point; the data voltage corresponding to the green sub-pixel at the preset grayscale segment point is determined based on the gamma register value of the green sub-pixel at the preset grayscale segment point; and the data voltage corresponding to the blue sub-pixel at the preset grayscale segment point is determined based on the gamma register value of the blue sub-pixel at the preset grayscale segment point.

[0105] Step 450: Take the smallest data voltage of each color sub-pixel at the preset gray level segmentation point as the second reference voltage corresponding to the first gray level and store it.

[0106] Specifically, in this step, the minimum data voltage of the red, green, and blue sub-pixels at the preset grayscale segment points is used as the second reference voltage for the first grayscale stage. This avoids the phenomenon that the data voltage corresponding to some grayscale levels may not be available for a certain color sub-pixel due to the second reference voltage being too large. This ensures that the voltage range from the second reference voltage to the first reference voltage can meet the data voltage values ​​of each color sub-pixel in the first grayscale stage, thereby ensuring good grayscale performance while improving the precision of data voltage adjustment.

[0107] Step 460: Determine the maximum target gray level among the target gray levels of each sub-pixel in the display sub-region.

[0108] Specifically, when the display panel displays an image, the target grayscale corresponding to different sub-pixels may be different. In this step, the maximum target grayscale in the display sub-region can be determined based on the target grayscale of each sub-pixel in the display sub-region.

[0109] Step 470: Determine the data voltage corresponding to each sub-pixel in the display sub-region based on the first reference voltage and the second reference voltage corresponding to the first gray stage to which the maximum target gray level belongs.

[0110] The first gray stage to which the maximum target gray level belongs is the gray stage among all first gray stages where the gray level of the gray level segment point is greater than or equal to the maximum target gray level, and the absolute value of the difference between the two is the smallest. Taking multiple first gray stages as an example, which may include gray levels 0-32, 0-64, 0-128, 0-200, and 0-225, when the maximum target gray level corresponding to the displayed sub-area is 90 gray levels, the first gray stage to which the maximum target gray level belongs is gray level 0-128.

[0111] In this step, the data voltage corresponding to each sub-pixel in the display sub-region is determined by the first reference voltage and the second reference voltage corresponding to the first gray stage to which the maximum target gray level belongs. This improves the precision in determining the data voltage corresponding to each sub-pixel in the display sub-region, thereby enhancing the display effect.

[0112] It should be noted that in this embodiment, the first reference voltage corresponding to each first gray level is the same as the first reference voltage corresponding to the maximum gray level. That is, the highest voltage corresponding to each first gray level is the same as the highest voltage corresponding to the maximum gray level. However, the second reference voltages corresponding to different first gray levels are different, and the second reference voltages corresponding to each first gray level are also different from the second reference voltages corresponding to the maximum gray level. This approach is more suitable for situations where the display panel has poor display performance in the low gray level range. It allows for more precise adjustment of the data voltage in the low gray level range, which is more conducive to the finer development of gray levels in the low gray level range and further improves the display performance of the display panel in the low gray level range.

[0113] In another optional embodiment of the present invention, the gray stage includes a plurality of second gray stages from the gray level segmentation point to the highest gray level within the maximum gray stage; for example, the maximum gray stage includes gray levels 0-255, and the plurality of second gray stages may include gray levels 32-255, 64-255, 128-255, 200-255, and 225-255.

[0114] Figure 5 This is a flowchart of another display panel driving method provided in an embodiment of the present invention, see reference. Figure 5 The driving method for this display panel includes:

[0115] Step 510: Determine the first reference voltage and the second reference voltage corresponding to the maximum gray level of the display panel according to the target display parameters, so that the absolute value of the difference between the first reference voltage and the second reference voltage corresponding to the maximum gray level is minimized under the premise of satisfying the target display parameters. The maximum gray level is the lowest to the highest gray level that the display panel can display. This step is the same as step 110 in the above embodiment, and will not be described again here.

[0116] Step 520: Perform gamma adjustment based on the first reference voltage and the second reference voltage to determine the gamma register value corresponding to at least a portion of the gray levels; this step is the same as step 310 in the above embodiment, and will not be repeated here.

[0117] Step 530: Use the second reference voltage corresponding to the maximum gray stage as the second reference voltage corresponding to each second gray stage within the maximum gray stage.

[0118] In other words, in this embodiment, the second reference voltage corresponding to each second gray stage is equal to the second reference voltage corresponding to the maximum gray stage.

[0119] Step 540: Determine the data voltage corresponding to the grayscale segment point of each color sub-pixel based on the gamma register value corresponding to the preset grayscale segment point. This step is the same as step 440 in the above embodiment, and will not be repeated here.

[0120] Step 550: Take the largest data voltage of each color sub-pixel at the preset gray level segmentation point as the first reference voltage of the corresponding second gray level and store it.

[0121] Specifically, in this step, the largest of the data voltages corresponding to the preset grayscale segment points of the red, green, and blue sub-pixels is used as the first reference voltage for the corresponding second grayscale stage. This avoids the phenomenon that the data voltages corresponding to some grayscale levels may not be available for a certain color sub-pixel due to the first reference voltage being too small. This ensures that the voltage range from the second reference voltage to the first reference voltage can meet the data voltage values ​​of each color sub-pixel in the second grayscale stage, thereby ensuring good grayscale performance while improving the precision of data voltage adjustment.

[0122] Step 560: Determine the minimum target gray level among the target gray levels of each sub-pixel in the display sub-region.

[0123] Step 570: Determine the data voltage corresponding to each sub-pixel in the display sub-region based on the first reference voltage and the second reference voltage corresponding to the second gray stage to which the minimum target gray level belongs.

[0124] Among them, the second gray stage to which the minimum target gray level belongs is the second gray stage in which the gray level of the gray level segment point is less than or equal to the minimum target gray level, and the absolute value of the difference between the gray level and the minimum target gray level is the smallest.

[0125] Taking the example that multiple second gray levels can include gray levels 32-255, 64-255, 128-255, 200-255, and 225-255, when the minimum target gray level corresponding to the display sub-area is 90, the second gray level to which the minimum target gray level belongs is 64-255.

[0126] In this step, the data voltage corresponding to each sub-pixel in the display sub-region is determined by the first reference voltage and the second reference voltage corresponding to the second gray stage to which the minimum target gray level belongs. This improves the precision in determining the data voltage corresponding to each sub-pixel in the display sub-region, thereby enhancing the display effect.

[0127] It should be noted that in this embodiment, the second reference voltage corresponding to each second gray level is the same as the second reference voltage corresponding to the maximum gray level. That is, the highest voltage corresponding to each second gray level is the same as the highest voltage corresponding to the maximum gray level. However, the first reference voltages corresponding to different second gray levels are different, and the first reference voltages corresponding to each second gray level are also different from the first reference voltages corresponding to the maximum gray level. This approach is more suitable for situations where the display panel's display effect is poor in the high grayscale range. It allows for more precise adjustment of the data voltage in the high grayscale range, which is more conducive to the finer development of grayscale in the high grayscale range and further improves the display effect of the display panel in the high grayscale range.

[0128] Based on the above embodiments, optionally, the gray stage also includes intermediate gray stages between adjacent gray level segmentation points. For example, the maximum gray stage includes gray levels 0-255, and multiple intermediate gray stages may include gray levels 33-64, 65-127, 128-200, and 201-225, and also includes at least one first gray stage, i.e., gray levels 0-32, and at least one second gray stage, i.e., gray levels 226-255.

[0129] Figure 6 This is a flowchart of another display panel driving method provided in an embodiment of the present invention, see reference. Figure 6 The driving method for this display panel includes:

[0130] Step 610: Determine the first reference voltage and the second reference voltage corresponding to the maximum gray level of the display panel according to the target display parameters, so that the absolute value of the difference between the first reference voltage and the second reference voltage corresponding to the maximum gray level is minimized under the premise of satisfying the target display parameters. The maximum gray level is the lowest to the highest gray level that the display panel can display. This step is the same as step 110 in the above embodiment, and will not be described again here.

[0131] Step 620: Perform gamma adjustment based on the first reference voltage and the second reference voltage to determine the gamma register value corresponding to at least a portion of the gray levels; this step is the same as step 310 in the above embodiment, and will not be repeated here.

[0132] Step 630: For the intermediate gray stage, the smallest data voltage of each color sub-pixel corresponding to the smaller gray level segment point is used as the first reference voltage of the corresponding intermediate gray stage and stored; the largest data voltage of each color sub-pixel corresponding to the larger gray level segment point is used as the second reference voltage of the corresponding intermediate gray stage and stored.

[0133] Specifically, each intermediate gray stage includes two grayscale endpoints: one endpoint corresponds to a smaller grayscale segment point, and the other endpoint corresponds to a larger grayscale segment point. In this step, the data voltage of each color sub-pixel at the smaller grayscale segment point is calculated, and the minimum of these data voltages is used as the first reference voltage for the corresponding intermediate gray stage. Similarly, the data voltage of each color sub-pixel at the larger grayscale segment point is calculated, and the maximum of these data voltages is used as the second reference voltage for the corresponding intermediate gray stage. This ensures that, given the data voltages at both the smaller and larger grayscale segment points of the intermediate gray stage are available, the difference between the first and second reference voltages is minimized, resulting in a smaller voltage range for the intermediate gray stage. This improves the precision of subsequent steps in adjusting the data voltages corresponding to grayscale levels within the intermediate gray stage based on the first and second reference voltages.

[0134] Step 640: Determine the maximum and minimum target gray levels among the target gray levels of each sub-pixel in the display sub-region.

[0135] Specifically, for each display sub-region, the highest target gray level can be obtained as the maximum target gray level based on the target gray levels of each sub-pixel in the display sub-region, and the lowest target gray level can be obtained as the minimum target gray level.

[0136] Step 650: Determine the data voltage corresponding to each sub-pixel in the display sub-region based on the first reference voltage and the second reference voltage corresponding to the intermediate gray stages from the minimum target gray level to the maximum target gray level.

[0137] The intermediate grayscale range from the minimum target grayscale to the maximum target grayscale is the smallest range of intermediate grayscale ranges that includes both the minimum and maximum target grayscale levels. For example, the maximum grayscale range includes grayscale levels 0-255, and multiple intermediate grayscale ranges may include grayscale levels 33-64, 65-127, 128-200, 201-225, and 226-255. When the maximum target grayscale level corresponding to the displayed sub-region is 90 and the minimum target grayscale level is 70, the intermediate grayscale range from the minimum to the maximum target grayscale level is 65-127.

[0138] It should be noted that the driving method of the display panel in this embodiment can be used in conjunction with the method described above in this invention. Figure 4 and / or Figure 5 The driving method of the display panel in the corresponding embodiment, for the first gray stage within the maximum gray stage, can be based on Figure 4The driving method in the corresponding embodiment determines the data voltage. For the second gray stage within the maximum gray stage, it can be based on... Figure 5 The driving method of the embodiment determines the data voltage. However, when it is determined that the gray stage corresponding to a display sub-region belongs to both a first gray stage and an intermediate gray stage, the data voltage corresponding to the sub-pixel in the display sub-region is determined based on the first reference voltage and the second reference voltage corresponding to the intermediate gray stage. Similarly, when it is determined that the gray stage corresponding to a display sub-region belongs to both a second gray stage and an intermediate gray stage, the data voltage corresponding to the sub-pixel in the display sub-region is determined based on the first reference voltage and the second reference voltage corresponding to the intermediate gray stage, thereby further improving the precision of data voltage adjustment.

[0139] This invention also provides a driving device for a display panel. Figure 7 This is a schematic diagram of the structure of a display panel driving device provided in an embodiment of the present invention, with reference to... Figure 7 The driving device for the display panel includes:

[0140] The reference voltage determination module 710 is used to determine the first reference voltage and the second reference voltage corresponding to the maximum gray level of the display panel according to the target display parameters, so as to minimize the absolute value of the difference between the first reference voltage and the second reference voltage corresponding to the maximum gray level under the premise of satisfying the target display parameters. The maximum gray level is the lowest gray level to the highest gray level that the display panel can display.

[0141] The data voltage determination module 720 is used to determine the data voltage corresponding to each gray level within the maximum gray stage of the display panel based on the first reference voltage and the second reference voltage corresponding to the maximum gray stage.

[0142] The display panel driving device of this embodiment is used to execute the display panel driving method of any of the above embodiments of the present invention, and has the beneficial effects of the display panel driving method of any of the above embodiments of the present invention.

[0143] This invention also provides a display driver chip. Figure 8 This is a schematic diagram of the structure of a display driver chip provided in an embodiment of the present invention, for reference. Figure 8 The display driver chip 10 includes: at least one gamma circuit selection module 810, a storage module 820, and a comparison module 830; the storage module 820 includes storage units 821 corresponding one-to-one with the gamma circuit selection module 810; wherein Figure 8 The example shown is a display driver chip that includes two gamma circuit selection modules 810. Correspondingly, the storage module 820 includes two storage units 821.

[0144] The comparison module 830 is electrically connected to each storage unit 821 and is used to compare the target grayscale currently received with the target grayscale previously received in the storage unit 821 and generate a comparison result.

[0145] The gamma circuit selection module 810 is used to select the corresponding first reference voltage and / or second reference voltage based on the comparison result.

[0146] The target grayscale includes multiple target grayscale values ​​corresponding to sub-pixels. The display driver chip drives the display panel, and the display area of ​​the display panel can be divided into at least one display sub-region. Each storage unit 821 is used to store the target grayscale values ​​corresponding to the sub-pixels included in one display sub-region; that is, each storage unit 821 can store the target grayscale value corresponding to one display sub-region. When the display panel displays an image, each frame corresponds to one display image. The display images corresponding to different frames may be the same or different. For a display sub-region, when the display images corresponding to the sub-region are the same in two adjacent frames, its corresponding target grayscale value does not change; when the display images corresponding to the sub-region are different in two adjacent frames, its corresponding target grayscale value changes.

[0147] The comparison unit is electrically connected to each storage unit 821. For each storage unit 821, the comparison unit can compare the target gray level currently received by the storage unit 821 with the target gray level previously received, and generate the corresponding comparison result to the gamma circuit selection module 810 corresponding to the storage unit 821.

[0148] Optionally, the comparison module 830 is used to generate a first comparison result when the target gray level received in the current time and the target gray level received in the previous time belong to the same gray level in the storage unit 821, so that the corresponding gamma circuit selection module 810 does not operate.

[0149] Specifically, when the target grayscale currently received in the storage unit 821 and the target grayscale previously received belong to the same gray stage, when driving the display panel, the data voltage corresponding to each grayscale in the gray stage can be determined by using the first reference voltage and the second reference voltage corresponding to the same gray stage for the current frame and the previous frame. Accordingly, the comparison module 830 is used to generate a first comparison result when the target grayscale currently received in the storage unit 821 and the target grayscale previously received belong to the same gray stage, so that the gamma circuit selection module 810 does not operate according to the first comparison result, keeping both the first reference voltage and the second reference voltage unchanged, and the corresponding gamma voltage range (that is, the range from the second reference voltage to the first reference voltage) unchanged.

[0150] When the target gray level received in the current time and the target gray level received in the previous time belong to different gray stages in the storage unit 821, a second comparison result is generated so that the corresponding gamma circuit selection module 810 is activated to switch the first reference voltage and / or the second reference voltage.

[0151] Specifically, when the target grayscale currently received in the storage unit 821 and the target grayscale previously received belong to different gray stages, when driving the display panel, the data voltage corresponding to each grayscale in the gray stage can be determined by using the first reference voltage and the second reference voltage corresponding to different gray stages for the current frame and the previous frame. Accordingly, the comparison module 830 is used to generate a second comparison result when the target grayscale currently received in the storage unit 821 and the target grayscale previously received belong to different gray stages, so that the gamma circuit selection module 810 operates according to the second comparison result, and then selects the first reference voltage and / or the second reference voltage corresponding to the gray stage to which the target grayscale currently received belongs, and the corresponding gamma voltage range (that is, the range from the second reference voltage to the first reference voltage) changes.

[0152] Optionally, the initial data of the storage unit 821 can be preset. After power-on, when the first frame of the screen is displayed, the comparison module 830 compares the target gray level of each display sub-area corresponding to the first frame of the screen with the initial data in the corresponding storage unit, and selects the first reference voltage and / or the second reference voltage through the gamma circuit selection module 810.

[0153] Optionally, in the above embodiments, the first comparison result and the second comparison result can be high-level or low-level signals. For example, if the first comparison result is a high-level signal, then the second comparison result is a low-level signal.

[0154] Continue to refer to Figure 8 Optionally, the storage unit 821 includes a first storage area 8211 and a second storage area 8212, with the first storage area 8211 and the second storage area 8212 being communicatively connected. The display driver chip also includes a storage control module 840, which is communicatively connected to the first storage area 8211 and the second storage area 8212, respectively, and is used to control the alternating transmission of target grayscale to the first storage area 8211 and the second storage area 8212.

[0155] Specifically, each storage unit 821 includes a first storage area 8211 and a second storage area. Under the control of the storage control module 840, the target grayscale is alternately transmitted to the first storage area 8211 and the second storage area 8212. That is, for two adjacent frames, the previous frame transmits the corresponding target grayscale to the first storage area 8211, and the subsequent frame transmits the corresponding target grayscale to the second storage area 8212. By controlling the alternate transmission of the target grayscale to the first storage area 8211 and the second storage area 8212, the comparison module 830 can compare the data stored in the first storage area 8211 and the second storage area 8212 when comparing new data (which can correspond to the currently received target grayscale) and old data (which can correspond to the previously received target grayscale) in the storage unit 821, making the comparison of new and old data much easier. The first storage area 8211 and the second storage area 8212 are communicatively connected. Accordingly, data stored in the first storage area 8211 can be transferred to the second storage area 8212, and data stored in the second storage area 8212 can also be transferred to the first storage area 8211. Optionally, the storage control module 840 controls the transfer of the target grayscale to one storage area, and then that storage area transfers the target grayscale to another storage area before outputting it, to provide buffer processing time for other circuit structures in the display driver chip.

[0156] Continue to refer to Figure 8 The display driver chip also includes a data voltage transmission module 850, which is communicatively connected to the storage module 820 and each gamma circuit selection module 810, and is used to output the corresponding data voltage to the display panel according to the target gray level of each storage unit 821 in the storage module 820 and the first reference voltage and the second reference voltage selected by the gamma circuit selection module 810.

[0157] Based on the above technical solution, the display driver chip also includes multiple first reference voltage sources U1 and / or multiple second reference voltage sources U2; the display driver chip also includes a gamma circuit, which includes a resistor string.

[0158] Figure 9 This is a schematic diagram of the structure of a gamma circuit selection module provided in an embodiment of the present invention, for reference. Figure 9 In an optional embodiment of the present invention, the gamma circuit selection module 810 further includes a first selection unit 812, and the display driver chip further includes multiple first reference voltage sources U1 and a second reference voltage source U2. The first selection unit 812 is used to select the corresponding first reference voltage source U1 to be connected to the first terminal of the gamma circuit 811 according to the comparison result. The voltage values ​​of the first reference voltages output by the multiple first reference voltage sources U1 are different.

[0159] Optionally, the first selection unit 812 may further include a multiplexer switch. Optionally, each gamma circuit 811 includes a first terminal and a second terminal, with a resistor string connecting the first and second terminals. The resistor string includes multiple resistors connected in series. Based on the comparison result, the first selection unit 812 selects the first reference voltage source U1 connected to the first terminal of the gamma circuit 811 via the multiplexer switch, thereby selecting the first reference voltage connected to the first terminal of the gamma circuit 811. The multiplexer switch may include multiple input terminals and one output terminal; in this case, the multiplexer switch may be a single-pole multi-throw switch structure. Figure 9 (As shown in the diagram), each input terminal is connected to a first reference voltage source U1, and the output terminal of the multiplexer is connected to the first terminal of the gamma circuit 811. The multiplexer may include multiple first switches, wherein the first terminal of each first switch is connected to a first reference voltage source U1, and the second terminal of each first switch is electrically connected to the first terminal of the gamma circuit 811. Figure 10 This is a schematic diagram of another gamma circuit selection module provided in an embodiment of the present invention, for reference. Figure 10 Based on the above technical solution, in another optional embodiment of the present invention, the gamma circuit selection module 810 further includes a second selection unit 813, and the display driver chip further includes a first reference voltage source U1 and multiple second reference voltage sources U2. The second selection unit 813 is used to select the corresponding second reference voltage source U2 to be connected to the second terminal of the gamma circuit 811 according to the comparison result. The voltage values ​​of the second reference voltages output by the multiple second reference voltage sources U2 are different.

[0160] Optionally, the second selection unit 813 may further include a multiplexer switch. Optionally, each gamma circuit 811 includes a first terminal and a second terminal, with a resistor string connecting the first and second terminals. The resistor string includes multiple resistors connected in series. Based on the comparison result, the second selection unit 813 selects the second reference voltage connected to the second reference voltage source U2 via the multiplexer switch, thereby selecting the second reference voltage connected to the second terminal of the gamma circuit 811. The multiplexer switch may include multiple input terminals and one output terminal. In this case, the multiplexer switch can be a single-pole multi-throw switch, where each input terminal is connected to a second reference voltage source U2, and the output terminal of the multiplexer switch is connected to the second terminal of the gamma circuit 811. The multiplexer switch may include multiple second switches, where the first terminal of each second switch is connected to a corresponding second reference voltage source U2, and the second terminal of each second switch is electrically connected to the second terminal of the gamma circuit 811.

[0161] It should be noted that, Figure 9 In the display driver chip, the second terminal of the gamma circuit 811 is fixedly connected to a second reference voltage source U2 as an example. Figure 10In the example shown in the display driver chip, the first terminal of the gamma circuit 811 is fixedly connected to a first reference voltage source U1. However, in other optional embodiments of the present invention, the gamma circuit selection module 810 may simultaneously include a first selection unit 812 and a second selection unit 813. In this case, the first terminal of the gamma circuit 811 is connected to the first selection unit 812, and the second terminal of the gamma circuit 811 is connected to the second selection unit 813. The first selection unit 812 selects the first reference voltage source U1 connected to the first terminal of the gamma circuit 811, and the second selection unit 813 selects the second reference voltage source U2 connected to the second terminal of the gamma circuit 811.

[0162] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection 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 concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A driving method for a display panel, characterized in that, include: The first reference voltage and the second reference voltage corresponding to the maximum gray level of the display panel are determined according to the target display parameters, so that the absolute value of the difference between the first reference voltage and the second reference voltage corresponding to the maximum gray level is minimized under the premise of satisfying the target display parameters. The maximum gray level is the lowest to the highest gray level that the display panel can display. The data voltage corresponding to each gray level within the maximum gray level of the display panel is determined based on the first reference voltage and the second reference voltage corresponding to the maximum gray level; the target display parameters include a first target brightness and a first target color coordinate corresponding to a first set gray level, and a second target brightness and a second target color coordinate corresponding to a second set gray level; or, the target display parameters include a first target color coordinate corresponding to a first set gray level, a second target brightness and a second target color coordinate corresponding to a second set gray level, and a target contrast ratio, wherein the first target brightness corresponding to the first set gray level is determined by the second target brightness and the target contrast ratio; The step of determining the first reference voltage and the second reference voltage corresponding to the maximum grayscale level of the display panel based on the target display parameters includes: Under the condition that the first set screen is displayed on the display panel, the first voltage value corresponding to the first reference voltage is gradually increased from the first initial set voltage, and the data voltage corresponding to each color sub-pixel in the display panel is adjusted under each first voltage value, and the first voltage value that first satisfies the requirements of the first target brightness and the first target color coordinates is determined as the first reference voltage corresponding to the maximum gray stage. Under the condition that the second set screen is displayed on the display panel, the second voltage value corresponding to the second reference voltage is gradually reduced starting from the second initial set voltage, and the data voltage corresponding to each color sub-pixel in the display panel is adjusted under each second voltage value, and the second voltage value that first meets the requirements of the second target brightness and the second target color coordinates is determined as the second reference voltage corresponding to the maximum gray stage; Wherein, the first set gray level is the lowest gray level of the maximum gray stage, and the first set screen is a black screen; the second set gray level is the highest gray level of the maximum gray stage, and the second set screen is a white screen.

2. The driving method for the display panel according to claim 1, characterized in that, The step of determining the data voltage corresponding to each gray level within the maximum gray stage of the display panel based on the first reference voltage and the second reference voltage corresponding to the maximum gray stage includes: Gamma adjustment is performed based on the first reference voltage and the second reference voltage to determine the gamma register value corresponding to at least a portion of the grayscale levels; The data voltage corresponding to the grayscale segment point is determined based on the gamma register value of the grayscale segment point corresponding to the preset grayscale segment point within the maximum grayscale segment, and is stored as the first reference voltage or the second reference voltage corresponding to the preset grayscale segment; wherein, the maximum grayscale segment and each preset grayscale segment within the maximum grayscale segment correspond to a pair of first reference voltage and second reference voltage, the first reference voltage being the highest voltage corresponding to the grayscale segment, and the second reference voltage being the lowest voltage corresponding to the grayscale segment; wherein, the maximum grayscale segment and each preset grayscale segment within the maximum grayscale segment have the same number of gamma register bits; Based on the first reference voltage and the second reference voltage corresponding to the gray stage to which the target gray level of each sub-pixel belongs in the display sub-regions divided by the display panel, the data voltage corresponding to the sub-pixel in the display sub-regions is determined, wherein the display panel is divided into at least one display sub-region.

3. The driving method for the display panel according to claim 2, characterized in that, The gray stage includes multiple first gray stages from the lowest gray level within the maximum gray stage to the gray level segmentation point; the step of determining the data voltage corresponding to the gray level segmentation point based on the gamma register value of the gray level segmentation point corresponding to the preset gray stage within the maximum gray stage, and storing it as the first reference voltage or the second reference voltage corresponding to the preset gray stage, includes: The first reference voltage corresponding to the maximum gray stage is used as the first reference voltage corresponding to each first gray stage within the maximum gray stage. The data voltage corresponding to each color sub-pixel at the grayscale segment point is determined based on the gamma register value corresponding to each color sub-pixel at the preset grayscale segment point. The smallest data voltage among the preset grayscale segment points for each color sub-pixel is used as the second reference voltage corresponding to the first grayscale stage and stored.

4. The driving method for the display panel according to claim 2, characterized in that, The gray stage includes multiple second gray stages from the gray level segmentation point to the highest gray level within the maximum gray stage; the step of determining the data voltage corresponding to the gray level segmentation point based on the gamma register value of the gray level segmentation point corresponding to the preset gray stage within the maximum gray stage, and storing it as the first reference voltage or the second reference voltage corresponding to the preset gray stage, includes: The second reference voltage corresponding to the maximum gray stage is used as the second reference voltage corresponding to each second gray stage within the maximum gray stage; The data voltage corresponding to each color sub-pixel at the grayscale segment point is determined based on the gamma register value corresponding to each color sub-pixel at the preset grayscale segment point. The largest value among the data voltages corresponding to the preset grayscale segment points of each color sub-pixel is used as the first reference voltage corresponding to the second grayscale stage and stored.

5. The driving method for a display panel according to claim 2, characterized in that, The gray stage also includes an intermediate gray stage between adjacent gray level segmentation points; The step of determining the data voltage corresponding to the gray level segment point based on the gamma register value of the gray level segment point corresponding to the preset gray level within the maximum gray level, and storing it as the first reference voltage or the second reference voltage corresponding to the preset gray level, further includes: For the intermediate gray stage, the smallest data voltage of each color sub-pixel corresponding to the smaller gray level segment point is used as the first reference voltage of the corresponding intermediate gray stage and stored; the largest data voltage of each color sub-pixel corresponding to the larger gray level segment point is used as the second reference voltage of the corresponding intermediate gray stage and stored.

6. The driving method for a display panel according to claim 3, characterized in that, The step of determining the data voltage corresponding to the sub-pixel in the display sub-region based on the first reference voltage and the second reference voltage corresponding to the gray level to which each sub-pixel belongs in the display sub-region divided by the display panel includes: Determine the maximum target gray level among the target gray levels of each sub-pixel in the display sub-region; The data voltage corresponding to each sub-pixel in the display sub-region is determined based on the first reference voltage and the second reference voltage corresponding to the first gray stage to which the maximum target gray level belongs; Wherein, the first gray stage to which the maximum target gray level belongs is the first gray stage in each first gray stage where the gray level of the gray level segment point is greater than or equal to the maximum target gray level, and the absolute value of the difference between the gray level segment point and the maximum target gray level is the smallest.

7. The driving method for a display panel according to claim 4, characterized in that, The step of determining the data voltage corresponding to the sub-pixel in the display sub-region based on the first reference voltage and the second reference voltage corresponding to the gray level to which each sub-pixel belongs in the display sub-region divided by the display panel includes: Determine the minimum target gray level among the target gray levels of each sub-pixel in the display sub-region; The data voltage corresponding to each sub-pixel in the display sub-region is determined based on the first reference voltage and the second reference voltage corresponding to the second gray stage to which the minimum target gray level belongs; Wherein, the second gray stage to which the minimum target gray level belongs is the second gray stage in each second gray stage where the gray level of the gray level segment point is less than or equal to the minimum target gray level, and the absolute value of the difference between the gray level segment point and the minimum target gray level is the smallest.

8. The driving method for a display panel according to claim 5, characterized in that, The step of determining the data voltage corresponding to the sub-pixel in the display sub-region based on the first reference voltage and the second reference voltage corresponding to the gray level to which each sub-pixel belongs in the display sub-region divided by the display panel includes: Determine the maximum and minimum target gray levels among the target gray levels of each sub-pixel in the display sub-region; The data voltage corresponding to each sub-pixel in the display sub-region is determined based on the first reference voltage and the second reference voltage corresponding to the intermediate gray stage from the minimum target gray level to the maximum target gray level; Wherein, the intermediate gray stage to which the minimum target gray level to the maximum target gray level belongs is the intermediate gray stage that includes the smallest range of the intermediate gray levels from the minimum target gray level to the maximum target gray level among all the intermediate gray stages.

9. A driving device for a display panel, characterized in that, include: The reference voltage determination module is used to determine the first reference voltage and the second reference voltage corresponding to the maximum gray level of the display panel according to the target display parameters, so as to minimize the absolute value of the difference between the first reference voltage and the second reference voltage corresponding to the maximum gray level under the premise of satisfying the target display parameters. The maximum gray level is the lowest to the highest gray level that the display panel can display. The data voltage determination module is used to determine the data voltage corresponding to each gray level within the maximum gray stage of the display panel based on the first reference voltage and the second reference voltage corresponding to the maximum gray stage. The target display parameters include a first target brightness and a first target color coordinate corresponding to a first set gray level, and a second target brightness and a second target color coordinate corresponding to a second set gray level; or, the target display parameters include a first target color coordinate corresponding to a first set gray level, a second target brightness and a second target color coordinate corresponding to a second set gray level, and a target contrast ratio, wherein the first target brightness corresponding to the first set gray level is determined by the second target brightness and the target contrast ratio; The step of determining the first reference voltage and the second reference voltage corresponding to the maximum grayscale level of the display panel based on the target display parameters includes: Under the condition that the first set screen is displayed on the display panel, the first voltage value corresponding to the first reference voltage is gradually increased from the first initial set voltage, and the data voltage corresponding to each color sub-pixel in the display panel is adjusted under each first voltage value, and the first voltage value that first satisfies the requirements of the first target brightness and the first target color coordinates is determined as the first reference voltage corresponding to the maximum gray stage. Under the condition that the second set screen is displayed on the display panel, the second voltage value corresponding to the second reference voltage is gradually reduced starting from the second initial set voltage, and the data voltage corresponding to each color sub-pixel in the display panel is adjusted under each second voltage value, and the second voltage value that first meets the requirements of the second target brightness and the second target color coordinates is determined as the second reference voltage corresponding to the maximum gray stage; Wherein, the first set gray level is the lowest gray level of the maximum gray stage, and the first set screen is a black screen; the second set gray level is the highest gray level of the maximum gray stage, and the second set screen is a white screen.

10. A display driver chip, characterized in that, The driving device for the display panel according to claim 9 further includes: at least one gamma circuit selection module, a storage module, and a comparison module; the storage module includes storage units corresponding one-to-one with the gamma circuit selection module; The comparison module is electrically connected to each of the storage units and is used to compare the target grayscale currently received with the target grayscale previously received in the storage unit and generate a comparison result. The gamma circuit selection module is used to select the corresponding first reference voltage and / or second reference voltage based on the comparison result.

11. The display driver chip according to claim 10, characterized in that, The comparison module is used to generate a first comparison result when the target grayscale currently received and the target grayscale previously received belong to the same gray level in the storage unit, so that the corresponding gamma circuit selection module does not operate. The comparison module is used to generate a second comparison result when the target gray level received in the current time and the target gray level received in the previous time belong to different gray stages in the storage unit, so as to activate the corresponding gamma circuit selection module to switch the first reference voltage and / or the second reference voltage. The target grayscale includes the target grayscale corresponding to each sub-pixel in a frame of the display image.

12. The display driver chip according to claim 10, characterized in that, The storage unit includes a first storage area and a second storage area, which are communicatively connected. The display driver chip also includes a storage control module, which is communicatively connected to the first storage area and the second storage area, and is used to control the alternating transmission of target grayscale to the first storage area and the second storage area.

13. The display driver chip according to claim 10, characterized in that, The display driver chip further includes multiple first reference voltage sources and / or multiple second reference voltage sources; the display driver chip further includes a gamma circuit, the gamma circuit including a resistor string; The gamma circuit selection module further includes a first selection unit, which is used to select the corresponding first reference voltage source to be connected to the first terminal of the gamma circuit according to the comparison result. And / or the gamma circuit selection module further includes a second selection unit, which is used to select the corresponding second reference voltage source to be connected to the second terminal of the gamma circuit according to the comparison result.

14. The display driver chip according to claim 13, characterized in that, Both the first selection unit and the second selection unit further include a multiplexer switch.

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