Analog power supply voltage control method and display device

Abstract

The invention provides an analog power supply voltage control method and a display device, and the method comprises the steps: obtaining to-be-displayed frame image data of a display panel, carrying out the calculation according to the to-be-displayed frame image data, obtaining a first reference gray scale, comparing the first reference gray scale with a preset gray scale threshold value, and obtaining the analog power supply voltage. And obtaining a standard gray scale in the to-be-displayed frame image data based on a comparison result that the first reference gray scale is greater than or equal to a preset gray scale threshold value, and outputting a first target analog power supply voltage for driving the display panel to display according to the standard gray scale so as to expand a voltage value adjustable range of the first target analog power supply voltage, the power consumption of the display device can be reduced by outputting the first target analog power supply voltage which is lower than the initial voltage value according to various display pictures of the display panel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a method for controlling analog power supply voltage and a display device. BACKGROUND

[0002] When the display device is in a working state, a power management integrated circuit of the display device provides an analog power supply voltage (AVDD) to a source driver of the display device, and the source driver drives a display panel of the display device to display according to the received analog power supply voltage. The voltage value of the analog power supply voltage not only affects the normal operation of the source driver, but also is positively correlated with the power consumption of the display device. Based on this, a related technology proposes a method for dynamically adjusting the analog power supply voltage (A-AVDD). In a case where a display picture of the display device meets a preset low gray scale condition, the power consumption of the display device is reduced by controlling the power management integrated circuit to output an analog power supply voltage with a preset low voltage value that is lower than an initial voltage value. In a case where the display picture does not meet the preset low gray scale condition, the output is maintained as the analog power supply voltage with the initial voltage value.

[0003] Since the output is maintained as the analog power supply voltage with the initial value in the case where the display picture does not meet the preset low gray scale condition, the adjustable range of the analog power supply voltage is limited. Therefore, the power consumption of the display device in this case cannot be reduced, so that the application scenario of the related technology for controlling the analog power supply voltage to save energy is limited. SUMMARY

[0004] The present application provides a method for controlling analog power supply voltage and a display device, aiming to expand the adjustable range of the analog power supply voltage.

[0005] In a first aspect, the present application provides a method for controlling analog power supply voltage, comprising the following steps: obtaining frame image data to be displayed of a display panel; calculating a first reference gray scale according to the frame image data to be displayed; comparing the size of the first reference gray scale and a preset gray scale threshold; based on the comparison result that the first reference gray scale is greater than or equal to the preset gray scale threshold, obtaining a standard gray scale in the frame image data to be displayed; and outputting a first target analog power supply voltage for driving the display panel to display according to the standard gray scale.

[0006] In the method for controlling analog power supply voltage provided by the present application, it further comprises: based on the comparison result that the first reference gray scale is less than the preset gray scale threshold, outputting a second target analog power supply voltage for driving the display panel to display, wherein the voltage value of the second target analog power supply voltage is less than the voltage value of the first target analog power supply voltage.

[0007] In the analog power supply voltage control method provided in the application, the step of obtaining the standard gray scale of the frame to be displayed based on the comparison result that the first reference gray scale is greater than or equal to the preset gray scale threshold comprises: obtaining a second reference gray scale based on the comparison result that the first reference gray scale is greater than or equal to the preset gray scale threshold, wherein the second reference gray scale is the display gray scale of a plurality of pixel units with the same gray scale value and a number greater than or equal to a preset number; and calculating the standard gray scale based on the second reference gray scale.

[0008] In the analog power supply voltage control method provided in the application, the preset number and the total number of pixel units of the display panel satisfy a first preset relationship, and the first preset relationship is:

[0009] wherein N preset is the preset number, N ttotal is the total number of pixel units.

[0010] In the analog power supply voltage control method provided in the application, the step of calculating the standard gray scale based on the second reference gray scale comprises: calculating the maximum gray scale in the second reference gray scale based on the second reference gray scale; and assigning the maximum gray scale as the standard gray scale.

[0011] In the analog power supply voltage control method provided in the application, the step of outputting the first target analog power supply voltage of the display panel based on the standard gray scale comprises: obtaining a first voltage value from a preset lookup table based on the standard gray scale, wherein the preset lookup table comprises a plurality of preset gray scale sets and preset voltage values corresponding to each preset gray scale set; and outputting the first target analog power supply voltage based on the first voltage value, wherein the voltage value of the first target analog power supply voltage is the same as the first voltage value.

[0012] In the analog power supply voltage control method provided in the application, the maximum preset gray scale of a first preset gray scale set in any two preset gray scale sets is less than the minimum preset gray scale of a second preset gray scale set in the any two preset gray scale sets, and the preset voltage value corresponding to the first preset gray scale set is less than the preset voltage value corresponding to the second preset gray scale set.

[0013] In a second aspect, the present application also provides a display device, comprising: a display panel, the display panel comprising pixel units arranged in an array; a timing controller, the timing controller being configured to obtain frame image data to be displayed by the display panel, and to calculate a first reference gray scale according to the frame image data to be displayed, to obtain a standard gray scale in the frame image data to be displayed based on a comparison result that the first reference gray scale is greater than or equal to a preset gray scale threshold, and to output a first control signal according to the standard gray scale; a power management integrated circuit, the power management integrated circuit being electrically connected to the timing controller, the power management integrated circuit being configured to output a first target analog power supply voltage according to the first control signal; and a source driver, the source driver being electrically connected to the power management integrated circuit and the display panel, the source driver being configured to drive the pixel units to display according to the first target analog power supply voltage.

[0014] In the display device provided by the present application, the timing controller is further configured to obtain a first voltage value from a preset lookup table according to the standard gray scale, and to output the first control signal according to the first voltage value, wherein the preset lookup table comprises a plurality of preset gray scale sets and preset voltage values mapped to each of the preset gray scale sets.

[0015] In the display device provided by the present application, the timing controller is further configured to output a second control signal based on a comparison result that the first reference gray scale is less than the preset gray scale threshold; the power management integrated circuit is further configured to output a second target analog power supply voltage according to the second control signal, wherein a voltage value of the second target analog power supply voltage is less than a voltage value of the first target analog power supply voltage; and the source driver is further configured to drive the pixel units to display according to the second target analog power supply voltage.

[0016] The analog power supply voltage control method provided by the present application compares the size of the first reference gray scale calculated based on the frame image data to be displayed and the preset gray scale threshold, obtains a standard gray scale in the frame image data to be displayed based on a comparison result that the first reference gray scale is greater than or equal to the preset gray scale threshold, and finally outputs a first target analog power supply voltage for driving the display panel to display according to the standard gray scale. In this way, the adjustable range of the voltage value of the first target analog power supply voltage is expanded, so that the display device can output a first target analog power supply voltage with a lower voltage value than the initial voltage value according to various display pictures of the display panel (including but not limited to display pictures satisfying the preset low gray scale condition in the related art), thereby reducing the energy consumption of the display device and widening the application scenarios of saving energy by adjusting the voltage value of the analog power supply voltage. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1This is a schematic diagram showing a high grayscale ratio of a single frame displayed by a display device in a related technology.

[0018] Figure 2 for Figure 1 The diagram shows a simulation of the voltage adjustment range of the analog power supply voltage corresponding to a high grayscale ratio.

[0019] Figure 3 A schematic diagram illustrating one step of a simulated power supply voltage control method provided in an embodiment of this application;

[0020] Figure 4 for Figure 3 A schematic diagram of one step in step S40;

[0021] Figure 5 for Figure 4 A schematic diagram of one step in step S42;

[0022] Figure 6 for Figure 3 A schematic diagram of one step in step S50;

[0023] Figure 7 A block diagram of a display device provided for an embodiment of this application. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. The described embodiments are only used to explain the ideas of the present invention and should not be regarded as limiting the scope of protection of this application.

[0025] In related technologies, the limitation of reducing the analog power supply voltage is that it further affects the luminance of the pixel units. To maintain the display quality before the analog power supply voltage was reduced, the grayscale of the pixel unit is increased relative to the displayed grayscale after the voltage reduction to compensate for the loss in luminance caused by the voltage reduction. However, for pixel units with high grayscale, the impact of the analog power supply voltage is greater than that for pixel units with lower grayscale, making it more difficult to perform grayscale compensation on high-grayscale pixel units to reduce display quality.

[0026] like Figure 1 As shown, curve A illustrates that in a frame of displayed image data, the display panel of a related technology's display panel displays a pixel unit with a high grayscale level (...). Figure 1 The high grayscale levels shown refer to the ratio between the number of grayscale levels 223 to 255 and the total number of pixel units on the display panel. Specifically, the highest grayscale level with a ratio greater than or equal to 5% is grayscale level 240.

[0027] Further, as shown in Figure 2 the inventors of the present application found that if the initial analog power supply voltage AVDD_11 can be reduced to the gray scale voltage AVDD_12 corresponding to 240 gray scales, it can be ensured that the pixel units with display gray scales below 240 can be compensated, so that the luminous brightness of the pixel units caused by the reduction of the voltage value of the analog power supply voltage can be reduced while reducing the energy consumption of the display device. However, due to the insufficient number of pixel units with display gray scales above 240, the luminous brightness of the pixel units with display gray scales above 240 caused by the reduction of the voltage value of the analog power supply voltage can be ignored.

[0028] Based on this, the present application provides an analog power supply voltage control method. The purpose is to expand the adjustable range of the voltage value of the first target analog power supply voltage, so that the display panel can output a first target analog power supply voltage with a lower voltage value than the initial voltage value for various display pictures (including but not limited to the display picture of the related art that meets the preset low gray scale condition) to reduce the energy consumption of the display device, and to expand the application scenarios of the dynamic adjustment of the analog power supply voltage method to save energy.

[0029] As shown in Figure 3 in the embodiments provided by the present application, the analog power supply voltage control method 1000 includes steps S10, S20, S30, S40 and S50.

[0030] In step S10, the display panel is obtained. The display panel is obtained. The display panel is obtained.

[0031] The "to-be-displayed frame image data" is provided by an external video source to the display device, and includes the to-be-displayed gray scale of each pixel unit in the display panel in a frame to-be-displayed period of the display panel and the position information of each pixel unit in the display panel. The position information and the to-be-displayed gray scale are in a one-to-one correspondence. Specifically, the "position information" includes the row and column of the pixel unit in the display panel.

[0032] In step S20, a first reference gray scale is calculated according to the to-be-displayed frame image data.

[0033] The "first reference gray scale" is related to the to-be-displayed gray scale of each pixel unit in the display panel in a frame to-be-displayed period, that is, the "first reference gray scale" is related to the to-be-displayed picture of the display panel. If the two frames of to-be-displayed pictures are not the same, the first reference gray scales calculated according to the to-be-displayed frame image data of the two frames of to-be-displayed pictures are not the same.

[0034] In some embodiments of the present application, the first reference gray level refers to an average gray level calculated according to display gray levels of all pixel units of the display panel in a frame of to-be-displayed frame image data.

[0035] In some other embodiments of the present application, the first reference gray level refers to an average gray level calculated according to display gray levels of part of the pixel units of the display panel in a frame of to-be-displayed frame image data. For example, the display area of the display panel is divided into a plurality of sub-display areas, and the average gray level calculated according to display gray levels of the pixel units in at least one sub-display area in a frame of to-be-displayed frame period and the number of pixel units in the sub-display area.

[0036] In step S30, the first reference gray level is compared with the preset gray level threshold.

[0037] In this step, the gray level value of the first reference gray level calculated based on step S20 is compared with the gray level value of the preset gray level threshold. The preset gray level threshold is a preset gray level value. The specific value of the preset gray level threshold can be set according to the actual needs of the display panel.

[0038] Taking the gray level display range of the pixel unit as an example, the specific range of the preset gray level threshold can be 220 gray levels to 230 gray levels. Specifically, the preset gray level threshold can be one of 220 gray levels, 221 gray levels, 222 gray levels, 223 gray levels, 224 gray levels, 225 gray levels, 226 gray levels, 227 gray levels, 228 gray levels, 229 gray levels, and 230 gray levels.

[0039] In step S40, based on the comparison result that the first reference gray level is greater than or equal to the preset gray level threshold, a standard gray level in the to-be-displayed frame image data is obtained.

[0040] That is, only when the comparison result that the gray level value of the first reference gray level is greater than or equal to the preset gray level threshold is a precondition, the step of obtaining the standard gray level in the to-be-displayed frame image data is executed.

[0041] In this step, the specific value of the standard gray level depends on the to-be-displayed gray level of each pixel unit in the to-be-displayed frame image data, that is, if the two frames of to-be-displayed frame image data are not identical, the standard gray levels of the two frames of to-be-displayed frame image data are not necessarily identical.

[0042] Specifically, as shown in FIG. 4, in some embodiments provided by the present application, step S40 can include: Figure 4

[0043] In step S41, based on the comparison result that the first reference gray level is greater than or equal to the preset gray level threshold, a second reference gray level is obtained according to the to-be-displayed frame image data.​

[0044] wherein the second reference gray scale is a display gray scale of a plurality of pixel units in the frame of image data to be displayed, which has the same gray scale value and a number greater than or equal to the preset number.

[0045] It is worth mentioning that the number of the second reference gray scale in a frame of image data to be displayed can be more than one.

[0046] For example, assuming that the preset number is 200 and the display gray scale range of the display panel is 0 gray scale to 255 gray scale, in a frame of image data to be displayed, the number of pixel units with a gray scale value of 226 is greater than or equal to 200, the number of pixel units with a gray scale value of 230 is greater than or equal to 200, the number of pixel units with a gray scale value of 235 is greater than or equal to 200, and the number of pixel units with a gray scale value of 240 is greater than or equal to 200, then in this frame of image data to be displayed, the second reference gray scale is gray scale 226, gray scale 230, gray scale 235, and gray scale 240, and the number of the second reference gray scale in this frame of image data to be displayed is 4. In another frame of image data to be displayed, assuming that only the number of pixel units with a gray scale value of 226 is greater than or equal to 200, then in this frame of image data to be displayed, the second reference gray scale is gray scale 226, and the number of the second reference gray scale in this frame of image data to be displayed is 1.

[0047] Further, in some embodiments provided in the present application, the preset number and the total number of pixel units of the display panel satisfy the following first preset relationship:

[0048]

[0049] In the first preset relationship (1), N preset is the preset number, and N total is the total number of pixel units.

[0050] For example, assuming that the resolution of the display panel is 1920x1080 (i.e., the display panel has a total of 1080 rows of pixel rows and 1920 columns of pixel columns, and each row of pixel rows has 1920 pixel units and each column of pixel columns has 1080 pixel units), then the total number of pixel units N total of the display panel is 2073600, and then the preset number N preset needs to be greater than or equal to 62208.

[0051] By controlling the percentage between the preset number and the total number of pixel units of the display panel to be greater than or equal to 3%, the human eye can visually perceive the pixel units that satisfy the screening condition (i.e., have the second reference gray scale).

[0052] Step S42: Calculate the standard gray level based on the second reference gray level.

[0053] In other words, in this step, the specific value of the standard grayscale depends on the specific value of the second reference grayscale.

[0054] Specifically, such as Figure 5 As shown, in some embodiments provided in this application, step S42 includes steps S42a and S42b.

[0055] Step S42a: Calculate the maximum gray level in the second reference gray level based on the second reference gray level.

[0056] Specifically, when there are multiple second reference gray levels, the gray level values ​​of two second reference gray levels are compared successively to determine the largest gray level among the multiple second reference gray levels. When there is only one second reference gray level, then this second reference gray level is the largest gray level.

[0057] Step S42b: Assign the maximum gray level to the standard gray level.

[0058] In other words, in this embodiment, the maximum gray level in the second reference gray level is assigned as the standard gray level, and the specific value of the standard gray level depends on the maximum value in the second reference gray level.

[0059] For example, suppose that in a frame of image data to be displayed, the second reference gray level is gray level 226, gray level 230, gray level 235, and gray level 240. Then, the maximum gray level in this frame of image data to be displayed is gray level 240. Furthermore, gray level 240 is assigned as the standard gray level, that is, the standard gray level is gray level 240.

[0060] For example, suppose that in another frame of image data to be displayed, the second reference gray level is gray level 226. Then, the maximum gray level in this frame of image data to be displayed is gray level 226. Furthermore, gray level 226 is assigned as the standard gray level, that is, the standard gray level is gray level 226.

[0061] It should be noted that in this embodiment, "maximum grayscale" does not refer to the actual maximum grayscale value that a pixel unit can display. For example, assuming the display panel's pixel units can display a grayscale range from 0 to 255, then the "actual maximum grayscale value that a pixel unit can display" is 255. For example, assuming the display panel's pixel units can display a grayscale range from 0 to 1023, then the "actual maximum grayscale value that a pixel unit can display" is 1023.

[0062] Please continue reading for more details. Figure 3In step S50, a first target analog power voltage of the display panel is output according to the standard gray scale.

[0063] It is worth mentioning that the gray scale displayed by the pixel unit is related to the gray scale voltage input to the pixel unit, and the greater the voltage value of the gray scale voltage input to the pixel unit, the greater the gray scale displayed by the pixel unit, and each gray scale value has a corresponding gray scale voltage.

[0064] In this step S50, the voltage value of the gray scale voltage of the pixel unit corresponding to the standard gray scale is less than the voltage value of the first target analog power voltage. In this way, by determining the basis of the standard gray scale to determine the voltage value of the gray scale voltage of the pixel unit, the voltage value of the first target analog power voltage output to the display panel is determined. And by outputting the first target analog power voltage with a voltage value greater than the voltage value of the gray scale voltage corresponding to the standard gray scale, while reducing the power consumption of the display device, it can at least ensure that the pixel units to be displayed between 0 gray scale and the standard gray scale can be compensated, thereby reducing the impact on the display quality of the display panel caused by outputting the first target analog power voltage.

[0065] Specifically, in some embodiments provided by the present application, as shown in Figure 6 step S50 includes step S51 and step S52.

[0066] In step S51, a first voltage value is obtained from a preset lookup table according to the standard gray scale. The preset lookup table includes a plurality of preset gray scale sets and a preset voltage value mapped to each preset gray scale set.

[0067] A "preset gray scale set" includes a preset gray scale or a plurality of preset gray scales that are continuous in value. In the case where a "preset gray scale set" includes a preset gray scale, the voltage value of the gray scale voltage of the pixel unit corresponding to this preset gray scale is less than the preset voltage value mapped to this preset gray scale set. In the case where a "preset gray scale set" includes a plurality of preset gray scales that are continuous in value, the maximum value of the preset gray scale in this preset gray scale set corresponds to the voltage value of the gray scale voltage of the pixel unit, which is less than the preset voltage value mapped to this preset gray scale set.

[0068] It is worth mentioning that there is no intersection between the plurality of preset gray scale sets. That is, a preset gray scale can only belong to one of the plurality of preset gray scale sets, but cannot belong to both one of the plurality of preset gray scale sets and another of the plurality of preset gray scale sets.

[0069] In step S51, the "first voltage value" is one of the plurality of preset voltage values, and the "first voltage value" is the preset voltage value mapped to the preset gray scale set corresponding to the standard gray scale.

[0070] Specifically, as shown in the following Table 1-1, if the maximum preset gray scale of a first preset gray scale set in the arbitrary two preset gray scale sets is less than the minimum preset gray scale of a second preset gray scale set in the arbitrary two preset gray scale sets, the preset voltage value mapped with the first preset gray scale set is less than the preset voltage value mapped with the second preset gray scale set.

[0071] Pre-set gray scale set Pre-set voltage value 255 AVDD Origin [250,254] 255 Data Voltage [240,250) 250 Data Voltage [230,240) 240 Data Voltage [223,230) 230 Data Voltage

[0072] Table 1-1

[0073] For example, taking the display gray scale range of a pixel unit of a display panel as 8 bits (0 gray scale to 255 gray scale, totally 256 gray scales) as an example, the preset gray scale range is 223 gray scale to 255 gray scale, and in this embodiment, the 223 gray scale to 255 gray scale is divided into 5 preset gray scale sets, and the gray scale values of the preset gray scales in each preset gray scale set do not have intersection. The plurality of preset gray scale sets and the plurality of preset voltage values are in one-to-one mapping relationship, and the plurality of preset voltage values are different from each other.

[0074] Specifically, one of the preset gray scale sets includes one preset gray scale, which is 255 gray scale, and the preset voltage value mapped with this preset gray scale set is the initial value AVDD Origin of the analog power supply voltage of the display panel. In this way, in the case that the standard gray scale belongs to this preset gray scale set, the luminance of the pixel unit with 255 gray scale can be compensated.

[0075] Specifically, one of the preset gray scale sets includes five preset gray scales, i.e., the preset gray scale set is [250, 254], and the five preset gray scales are 250 gray scale, 251 gray scale, 252 gray scale, 253 gray scale and 254 gray scale, respectively, and the preset voltage value mapped with this preset gray scale set is the gray scale voltage value 255Data Voltage corresponding to the pixel unit with 255 gray scale. In this way, in the case that the standard gray scale belongs to this preset gray scale set, the luminance of the pixel unit with 250 gray scale to 254 gray scale can be compensated.

[0076] It is worth mentioning that the initial value AVDD Origin of the analog power supply voltage is generally 0.8 volts (V) greater than the gray scale voltage value of the pixel unit corresponding to 255 gray scale.

[0077] Specifically, one of the preset gray scale sets includes ten preset gray scales, i.e., the preset gray scale set is [240, 250), and the ten preset gray scales are 240 gray scale, 241 gray scale, 242 gray scale, 243 gray scale, 244 gray scale, 245 gray scale, 246 gray scale, 247 gray scale, 248 gray scale, and 249 gray scale, respectively. Then, the preset voltage value corresponding to the pixel unit of 250 gray scale is 250Data Voltage. In this way, the luminance of the pixel unit of 240 gray scale to 249 gray scale can be compensated in the case that the standard gray scale belongs to the preset gray scale set.

[0078] Specifically, one of the preset gray scale sets includes ten preset gray scales, i.e., the preset gray scale set is [240, 250), and the ten preset gray scales are 240 gray scale, 241 gray scale, 242 gray scale, 243 gray scale, 244 gray scale, 245 gray scale, 246 gray scale, 247 gray scale, 248 gray scale, and 249 gray scale, respectively. Then, the preset voltage value corresponding to the pixel unit of 250 gray scale is 250Data Voltage. In this way, the luminance of the pixel unit of 240 gray scale to 249 gray scale can be compensated in the case that the standard gray scale belongs to the preset gray scale set.

[0079] Specifically, one of the preset gray scale sets includes ten preset gray scales, i.e., the preset gray scale set is [240, 250), and the ten preset gray scales are 240 gray scale, 241 gray scale, 242 gray scale, 243 gray scale, 244 gray scale, 245 gray scale, 246 gray scale, 247 gray scale, 248 gray scale, and 249 gray scale, respectively. Then, the preset voltage value corresponding to the pixel unit of 250 gray scale is 250Data Voltage. In this way, the luminance of the pixel unit of 240 gray scale to 249 gray scale can be compensated in the case that the standard gray scale belongs to the preset gray scale set.

[0080] Further, as shown in Table 1-1, in any two preset gray scale sets of the plurality of preset gray scale sets, if the preset gray scale maximum value of the first preset gray scale set of the any two preset gray scale sets is less than the preset gray scale minimum value of the second preset gray scale set of the any two preset gray scale sets, then the preset voltage value corresponding to the first preset gray scale set is less than the preset voltage value corresponding to the second preset gray scale set.

[0081] For example, assuming that the first preset gray scale set of the any two preset gray scale sets is [230, 240), and the second preset gray scale set is [250, 254], then the gray scale voltage value 240Data Voltage corresponding to the first preset gray scale set [230, 240) is less than the gray scale voltage value 254Data Voltage corresponding to the second preset gray scale set [250, 254].

[0082] Please continue to refer to Figure 6 , step S52, output the first target analog power supply voltage based on the first voltage value. Wherein, the voltage value of the first target analog power supply voltage is the same as the first voltage value.

[0083] That is to say, in this step, the size of the first target analog power supply voltage output to the display panel needs to be determined in a lookup table manner and from the preset lookup table to obtain the gray scale voltage value corresponding to the voltage value of the first target analog power supply voltage.

[0084] In the analog power supply voltage control method provided in this embodiment, based on the setting of the preset lookup table, the adjustable range of the first target analog power supply voltage is further refined, so that the display panel can output a first target analog power supply voltage with a lower voltage value than the initial voltage value for various display pictures (including but not limited to the display picture of the related art that meets the preset low gray scale condition) to reduce the energy consumption of the display device and widen the scene of saving the energy consumption of the display device by dynamically adjusting the analog power supply voltage.

[0085] Further, in some embodiments provided in the present application, as shown in Figure 3 , the analog power supply voltage control method 1000 further includes:

[0086] Step S60, output the second target analog power supply voltage of the display panel based on the comparison result that the first reference gray scale is less than the preset gray scale threshold. Wherein, the voltage value of the second target analog power supply voltage is less than the voltage value of the first target analog power supply voltage.

[0087] In the case that the gray scale value of the first reference gray scale is less than the preset gray scale threshold, it indicates that in this frame of to-be-displayed frame image data, the number of pixel units with non-high gray scale displayed is relatively large, then the second target analog power supply voltage with a voltage value less than the first target analog power supply voltage can be output to the display panel, so that while reducing the voltage value of the analog power supply voltage output to the display panel to achieve the purpose of reducing the energy consumption, the degree of reduction of the display picture quality of the display panel is relatively small.

[0088] Embodiments of the present application also provide a display device, as shown in Figure 7 , the display device 2000 includes a timing controller 100, a power management integrated circuit 200, a display panel 300 and a source driver 400.

[0089] The timing controller 100 is configured to acquire frame image data to be displayed of the display panel 300, to calculate a first reference gray scale according to the frame image data to be displayed, to acquire a standard gray scale in the frame image data to be displayed based on a comparison result of the first reference gray scale being greater than or equal to a preset gray scale threshold, and to output a first control signal according to the standard gray scale.

[0090] Specifically, the timing controller 100 generates display data RGB (the display data is a digital signal), a gate driving control signal GCS and a data driving control signal DCS based on externally input frame image data to be displayed in response to externally input control signals (the control signals are, for example, a horizontal synchronization signal Hsync, a vertical synchronization signal Vsync, a main clock signal CLK, etc.).

[0091] The data driving control signal DCS includes a source shift clock signal, a source start pulse signal, a data latch signal, etc. The gate driving control signal GCS includes a gate start signal, a gate output enable signal, etc. The display data RGB includes gray scale information of each pixel unit PX in the display panel 300, and the display data RGB is converted by the source driver 400 into a gray scale voltage (the gray scale voltage is an analog signal) corresponding to each pixel unit PX.

[0092] Since the display data RGB includes the gray scale information of each pixel unit PX, the timing controller 100 can calculate a first reference gray scale according to the display data RGB, compare the first reference gray scale with a preset gray scale threshold, and acquire a standard gray scale from the display data RGB according to a comparison result of the first reference gray scale being greater than or equal to the preset gray scale threshold.

[0093] The preset gray scale threshold is stored in a memory of the display device 2000, which can be a Read-Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), a One-time Programmable Read-Only Memory (OTPROM), an Electrically-Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical disk memories, a magnetic disk memory, a magnetic tape memory, or any other nonvolatile computer-readable storage medium capable of carrying or storing data. In addition, the memory can be integrated with the timing controller 100 on a master control board (C-Board) of the display device 2000, or the memory can be integrated with the source driver 400 on a horizontal control board (X-Board) of the display device 2000.

[0094] The power management integrated circuit 200 is electrically connected to the timing controller 100, and the power management integrated circuit 200 is configured to output a first target analog power voltage according to a first control signal.

[0095] Specifically, the power management integrated circuit 200 can be electrically connected to the power management integrated circuit 200 through an I2C bus (Inter-Integrated Circuit, two-wire serial bus), so that the timing controller 100 transmits the first control signal in the form of a digital signal to the power management integrated circuit 200 through the I2C channel to control the size of the first target analog power voltage AVDD1 output by the power management integrated circuit 200.

[0096] It is worth mentioning that in addition to providing the first target analog power voltage AVDD1 to the source driver 400, the power management integrated circuit 200 also provides a reference gamma voltage VGAM to the source driver 400, provides a power supply voltage VDD to the timing controller 100, provides a gate high-level signal VGH and a gate low-level signal VGL to the switching thin film transistor of the pixel unit PX in the display panel 300, and can also provide a common voltage VCOM inside the display panel 300.

[0097] Specifically, when the display device 2000 is in operation, the power management integrated circuit 200 outputs a first target analog power voltage AVDD1 having a pre-set voltage value and a reference gamma voltage VGAM. The reference gamma voltage VGAM includes a plurality of reference gamma sub-voltages (e.g., VGAM1 to VGAM9) having positive polarity and a plurality of reference gamma sub-voltages (e.g., VGAM10 to VGAM18) having negative polarity. The reference gamma sub-voltages VGAM1 to VGAM9 have voltage values between the first target analog power voltage AVDD1 and a common voltage VCOM. The reference gamma sub-voltages VGAM10 to VGAM18 have voltage values between the common voltage VCOM and a negative driving voltage AVSS. The negative driving voltage AVSS can be a ground voltage (0 volt) or a voltage less than the ground voltage.

[0098] The display panel 300 includes a plurality of pixel units PX arranged in an array.

[0099] Specifically, the display panel 300 includes m*n pixel units PX, m data lines (DL1 to DLm), and n scan lines (GL1 to GLn). The m*n pixel units PX are arranged in an array in a display area of the display panel 300. The m data lines (DL1 to DLm) are arranged along a first direction d1 and extend along a second direction d2. The n scan lines (GL1 to GLn) are arranged along the second direction d2 and extend along the first direction d1. Each pixel unit PX is electrically connected to one data line and one scan line. The display panel 300 is configured to display according to a received gray scale voltage.

[0100] According to the type of the display device 2000, the pixel units PX of the display panel 300 can include liquid crystals or organic light emitting diodes. When the display device 2000 is a liquid crystal display device, the display device 2000 further includes a backlight panel provided with light sources. The light sources of the backlight panel emit light to the display panel 300. Each pixel unit PX further includes a pixel electrode and a common electrode. The pixel unit PX forms an electric field between the pixel electrode and the common electrode in response to a gray scale voltage applied to the pixel electrode. The electric field formed between the pixel electrode and the common electrode controls the deflection of liquid crystals sandwiched between the pixel electrode and the common electrode, so that the transmittance of light emitted from the backlight panel and incident on the display panel 300 is adjusted, so that the pixel unit PX can emit light with a luminance corresponding to the gray scale voltage. When the display device 2000 is an organic light emitting display device, each pixel unit PX includes an organic light emitting diode as a light emitting element. The driving current flowing to the organic light emitting diode is controlled according to the voltage of the gray scale voltage, so that each pixel unit PX can emit light with a luminance corresponding to the gray scale voltage.

[0101] The source driver 400 is electrically connected to the pixel unit PX and the power management integrated circuit 200. The source driver 400 is configured to drive the pixel unit PX to display according to the first target analog power voltage.

[0102] That is, the source driver 400 converts the display data RGB provided by the timing controller 100 into a gray scale voltage corresponding to the display data using the first target analog power voltage AVDD1 provided by the power management integrated circuit 200, the reference gamma sub-voltage VGMA1 to VGMA9 with positive polarity (+), and the reference gamma sub-voltage VGMA10 to VGMA18 with negative polarity (-), and applies the converted gray scale voltage to the data lines DL1 to DLm of the display panel 300.

[0103] Please continue to refer to Figure 7 The display device 2000 further includes a gate driver 500 connected to the pixel unit PX of the display panel 300 through the gate lines GL1 to GLn of the display panel 300. The gate driver 500 can generate a gate signal based on a gate driving control signal GCS provided by the timing controller 100. The gate driver 500 outputs the generated gate signal to the pixel unit PX through the gate lines GL1 to GLn.

[0104] It is worth mentioning that the gate driver 500, the source driver 400, and the timing controller 100 can be configured as separate integrated circuits (ICs), or at least two of the gate driver 500, the source driver 400, and the timing controller 100 are integrated into the same integrated circuit. For example, the source driver 400 can be configured as an integrated circuit integrated with the timing controller 100 and / or the gate driver 500.

[0105] In addition, in Figure 7 , the gate driver 500 and the source driver 400 are shown as elements separate from the display panel 300. However, at least one of the gate driver 500 and the source driver 400 can be configured in an in-cell manner. By in-cell manner, at least one of the gate driver 500 and the source driver 400 is integrally formed with the display panel 300. For example, the gate driver 500 can be integrally formed with the display panel 300 according to an in-cell gate (GIP) manner.

[0106] Further, in some embodiments provided in the present application, the timing controller 100 is further configured to obtain a first voltage value from a preset lookup table according to a standard gray scale, and output a first control signal according to the first voltage value.

[0107] The preset lookup table is pre-stored in a memory of the display device 2000, and includes a plurality of preset gray scale sets and preset voltage values mapped to each preset gray scale set. The first voltage value is one of the plurality of preset voltage values, and the first voltage value is a preset voltage value mapped to a preset gray scale set corresponding to the standard gray scale.

[0108] In the display device 2000 provided in the embodiment, the timing controller 100 obtains the first voltage value mapped to the standard gray scale from the preset lookup table in a lookup table manner, and outputs the first control signal to the power management integrated circuit 200 according to the first voltage value, so that the power management integrated circuit 200 outputs the first target analog power voltage corresponding to the first control signal. By implementing segmented adjustment of the voltage value of the first target analog power voltage according to the gray scale value of the standard gray scale, the power consumption of the display device 2000 is saved while ensuring that the pixel unit with the maximum gray scale in the preset gray scale set to which the standard gray scale belongs can be compensated for gray scale, and the degree of impairment of the display quality of the display panel due to the fact that the analog power voltage output by the power management integrated circuit 200 to the source driver 400 is the first target analog power voltage is reduced.

[0109] Further, in some embodiments provided in the present application, the timing controller 100 is further configured to output a second control signal based on a comparison result that the first reference gray scale is less than the preset gray scale threshold.

[0110] The power management integrated circuit 200 is further configured to output a second target analog power voltage AVDD2 according to the second control signal. The voltage value of the second target analog power voltage AVDD2 is less than the voltage value of the first target analog power voltage AVDD1.

[0111] It is worth mentioning that in the case where the first target analog power voltage AVDD1 has a plurality of values, the voltage value of the second target analog power voltage AVDD2 is less than the minimum voltage value of the first target analog power voltage AVDD1.

[0112] The source driver 400 is further configured to drive the pixel unit PX to display according to the second target analog power voltage AVDD2.

[0113] In the display device 2000 provided in this embodiment, for the case that the gray scale value of the first reference gray scale is less than the preset gray scale threshold, it means that the number of the pixel units with low displayed gray scale is relatively large in the frame image data to be displayed in this frame, and then the power management integrated circuit 200 can be controlled to output the second target analog power supply voltage AVDD2 smaller than the first target analog power supply voltage AVDD1 to the source driver 400. In this way, while the voltage value of the analog power supply voltage output to the source driver 400 is reduced to reduce the energy consumption of the display device 2000, the degree of the display quality of the display panel being reduced is relatively small.

[0114] Of course, the present application can have other various embodiments, and those skilled in the art can make various corresponding changes and modifications according to the present application without departing from the spirit and essence of the present application. These corresponding changes and modifications shall all belong to the protection scope of the claims attached to the present application.

Claims

1. A method of analog power supply voltage control, characterized by, The method comprises the following steps: obtaining image data of a frame to be displayed of a display panel; calculating a first reference gray scale according to the image data of the frame to be displayed; comparing the first reference gray scale with a preset gray scale threshold; based on the comparison result that the first reference gray scale is greater than or equal to the preset gray scale threshold, obtaining a standard gray scale in the image data of the frame to be displayed; and outputting a first target analog power supply voltage for driving the display panel to display according to the standard gray scale. The method further comprises:

2. The analog supply voltage control method of claim 1, wherein based on the comparison result that the first reference gray scale is less than the preset gray scale threshold, outputting a second target analog power supply voltage for driving the display panel to display, wherein the voltage value of the second target analog power supply voltage is less than the voltage value of the first target analog power supply voltage. The step of obtaining the standard gray scale in the frame to be displayed based on the comparison result that the first reference gray scale is greater than or equal to the preset gray scale threshold comprises:

3. The analog supply voltage control method of claim 1, wherein based on the comparison result that the first reference gray scale is greater than or equal to the preset gray scale threshold, obtaining a second reference gray scale according to the image data of the frame to be displayed, wherein the second reference gray scale is a to-be-displayed gray scale of a plurality of pixel units of the display panel, the gray scale values of the plurality of pixel units are the same, and the number of the plurality of pixel units is greater than or equal to a preset number; calculating the standard gray scale according to the second reference gray scale. The preset number and the total number of pixel units of the display panel satisfy a first preset relationship, and the first preset relationship is:

4. The analog supply voltage control method of claim 3, wherein The step of calculating the standard gray scale according to the second reference gray scale comprises: wherein N preset is the preset number, N total is the total number of pixel units.

5. The analog supply voltage control method of claim 3, wherein, calculating a maximum gray scale in the second reference gray scale according to the second reference gray scale; assigning the maximum gray scale as the standard gray scale. The step of outputting the first target analog power supply voltage of the display panel according to the standard gray scale comprises:

6. The analog supply voltage control method of claim 1, wherein obtaining a first voltage value from a preset lookup table according to the standard gray scale, wherein the preset lookup table comprises a plurality of preset gray scale sets and a preset voltage value mapped to each preset gray scale set; outputting the first target analog power supply voltage based on the first voltage value, wherein the voltage value of the first target analog power supply voltage is the same as the first voltage value. The maximum preset gray scale of a first preset gray scale set in any two preset gray scale sets is less than the minimum preset gray scale of a second preset gray scale set in the any two preset gray scale sets, and the preset voltage value mapped to the first preset gray scale set is less than the preset voltage value mapped to the second preset gray scale set.

7. The analog supply voltage control method of claim 6, wherein, The method comprises:

8. A display device, characterized by comprising: a display panel comprising arrayed pixel units; a timing controller configured to obtain image data of a frame to be displayed of the display panel, calculate a first reference gray scale according to the image data of the frame to be displayed, obtain a standard gray scale in the image data of the frame to be displayed based on the comparison result that the first reference gray scale is greater than or equal to a preset gray scale threshold, and output a first control signal according to the standard gray scale; ​ A power management integrated circuit electrically connected with the timing controller, configured to output a first target analog power voltage according to the first control signal; and A source driver electrically connected with the power management integrated circuit and the display panel, configured to drive the pixel unit to display according to the first target analog power voltage.

9. The display device according to claim 8, wherein The timing controller is further configured to obtain a first voltage value from a preset lookup table according to the standard gray scale, and output the first control signal according to the first voltage value, wherein the preset lookup table comprises a plurality of preset gray scale sets and preset voltage values mapped to each preset gray scale set.

10. The display device according to claim 8 or 9, characterized by The timing controller is further configured to output a second control signal based on a comparison result that the first reference gray scale is less than the preset gray scale threshold; The power management integrated circuit is further configured to output a second target analog power voltage according to the second control signal, wherein a voltage value of the second target analog power voltage is less than a voltage value of the first target analog power voltage; and The source driver is further configured to drive the pixel unit to display according to the second target analog power voltage.

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