Voltage regulation method of display device and display device

Abstract

The invention discloses a voltage regulation method of a display device and the display device. The display device comprises a power management chip, a driving circuit and a display panel, the power management chip is connected with the driving circuit and is configured to provide a first voltage for the driving circuit, the driving circuit is connected with the display panel and is configured to drive the display panel to work, and the voltage regulation method comprises the steps of obtaining brightness information of the display device, the brightness information is used for adjusting the brightness of a display frame of the display panel; and adjusting the first voltage according to the brightness information. In the working process of the display device, the voltage provided by the power management chip is adjusted according to the brightness information of the display device, the power supply requirements of the driving circuit and the display panel are met, the quality of images displayed by the display panel is ensured, and meanwhile, the situation that the power consumption of the display device is too large due to the fact that the voltage provided by the power management chip is too large is avoided; the power consumption of the display device is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of display panels, and more specifically, to a voltage regulation method for a display device and a display device. Background Art

[0002] The display device includes a power management chip, a driving circuit and a display panel. The power management chip can supply power to the driving circuit so that the driving circuit drives the display panel to display images. When the voltage provided by the power management chip is too small to meet the power supply requirements, the image quality displayed by the display panel is poor. When the voltage provided by the power management chip is too large, the power consumption of the display device is large. Summary of the invention

[0003] Embodiments of the present application provide a voltage regulation method for a display device and a display device.

[0004] The voltage regulation method provided in the embodiment of the present application is used for a display device. The display device includes a power management chip, a driving circuit and a display panel, the power management chip is connected to the driving circuit and is configured to provide a first voltage to the driving circuit, the driving circuit is connected to the display panel and is configured to drive the display panel to work, and the voltage regulation method includes: obtaining brightness information of the display device, the brightness information is used to adjust the brightness of the display panel display screen; adjusting the first voltage according to the brightness information.

[0005] In some embodiments, in the process of adjusting the first voltage according to the brightness information, the value of the brightness information is positively correlated with the value to which the first voltage needs to be adjusted.

[0006] In some embodiments, the display device further includes a voltage conversion circuit, the power management chip is connected to the display panel via the voltage conversion circuit, and the voltage conversion circuit is configured to convert the first voltage into a second voltage for the display panel. The adjusting the first voltage according to the brightness information includes: determining a data voltage required by a pixel on the display panel according to the brightness information; and adjusting the first voltage according to the data voltage so that the second voltage is consistent with the data voltage.

[0007] In some embodiments, determining the data voltage required for the pixels on the display panel based on the brightness information includes: determining the gamma voltage of the display device displaying a pure black picture based on the brightness information, the value of the brightness information is positively correlated with the value of the gamma voltage of the display device displaying a pure black picture; determining the data voltage required for the pixels on the display panel based on the gamma voltage of the display device displaying a pure black picture.

[0008] In some embodiments, the voltage adjustment method further includes: acquiring temperature information and brightness information of the display device; and adjusting the first voltage according to the temperature information and the brightness information.

[0009] In some embodiments, in the process of adjusting the first voltage according to the temperature information and the brightness information, the value of the brightness information is positively correlated with the value to which the first voltage needs to be adjusted, and the value of the temperature information is positively correlated with the value to which the first voltage needs to be adjusted.

[0010] In some embodiments, the display device also includes a voltage conversion circuit, the power management chip is connected to the display panel through the voltage conversion circuit, and the voltage conversion circuit is configured to convert the first voltage into a second voltage for the display panel, and the adjusting the first voltage according to the temperature information and the brightness information includes: determining the data voltage required for the pixel on the display panel according to the brightness information and the temperature information; adjusting the first voltage according to the data voltage so that the second voltage is consistent with the data voltage.

[0011] In some embodiments, determining the data voltage required for the pixels on the display panel based on the temperature information and the brightness information includes: determining the gamma voltage of the display device displaying a pure black picture based on the brightness information, the value of the brightness information is positively correlated with the value of the gamma voltage of the display device displaying a pure black picture; determining the data voltage required for the pixels on the display panel based on the gamma voltage of the display device displaying a pure black picture and the temperature information, the value of the temperature information is positively correlated with the value of the data voltage.

[0012] The display device provided in the embodiment of the present application includes a display panel, a display driver chip and a power management chip. The display driver chip includes a drive circuit and a main control circuit, the drive circuit is connected to the display panel, and the main control circuit is configured to obtain brightness information of the display device, and control the drive circuit to drive the display panel to work according to the brightness information to adjust the brightness of the display panel display screen. The power management chip is connected to the drive circuit and is configured to provide a first voltage to the drive circuit, and the main control circuit is also configured to adjust the first voltage provided by the power management chip according to the brightness information.

[0013] In some embodiments, the display device further includes a temperature sensor, the temperature sensor is configured to detect the temperature of the display device, the main control circuit is connected to the temperature sensor to obtain the temperature information. The main control circuit is also configured to adjust the first voltage provided by the power management chip according to the brightness information and the temperature information.

[0014] In some embodiments, the display driver chip further includes a voltage conversion circuit, the power management chip is connected to the display panel via the voltage conversion circuit, and the voltage conversion circuit is configured to convert the first voltage into a second voltage for the display panel. The main control circuit is further configured to determine the data voltage required by the pixel on the display panel according to the brightness information, or to determine the data voltage required by the pixel on the display panel according to the brightness information and the temperature information, and the main control device is further configured to adjust the first voltage according to the data voltage so that the second voltage is consistent with the data voltage.

[0015] In the voltage regulation method and display device of the display device provided in the embodiment of the present application, the test data obtained through the experiment can determine the optimal voltage to which the display device needs to be adjusted at different brightnesses. During the operation of the display device, the voltage provided by the power management chip is adjusted according to the brightness information of the display device, so as to meet the power supply requirements of the driving circuit and the display panel, ensure the picture quality displayed by the display panel, and avoid excessive power consumption of the display device caused by excessive voltage provided by the power management chip, which is conducive to reducing the power consumption of the display device.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a schematic structural diagram of a display device according to a first embodiment of the present application;

[0019] Figure 2 is a flow chart of a voltage regulation method according to a first embodiment of the present application;

[0020] Figure 3 is a schematic structural diagram of a display device according to a second embodiment of the present application;

[0021] Figure 4 is a curve graph corresponding to the lookup table of the first embodiment of the present application;

[0022] Figure 5 is a schematic structural diagram of a display device according to a third embodiment of the present application;

[0023] Figure 6 is a flow chart of a voltage regulation method according to a second embodiment of the present application;

[0024] Figure 7It is a curve graph corresponding to the lookup table of the second embodiment of the present application.

[0025] Description of the main component symbols: display device 100 , power management chip 10 , display driver chip 20 , driver circuit 21 , main control circuit 22 , voltage conversion circuit 23 , display panel 30 , temperature sensor 40 . DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below, and the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout indicate the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0027] The display device includes a power management chip, a driving circuit and a display panel. The power management chip can supply power to the driving circuit so that the driving circuit drives the display panel to display images. When the voltage provided by the power management chip is too small to meet the power supply requirements, the image quality displayed by the display panel is poor. When the voltage provided by the power management chip is too large, the power consumption of the display device is large.

[0028] In order to solve the above technical problems, the present application provides a voltage regulation method and a display device. In the voltage regulation method and the display device provided in the present application, the test data obtained through the experiment can determine the optimal voltage that the display device needs to be adjusted to at different brightness.

[0029] During the operation of the display device, the voltage provided by the power management chip is adjusted according to the brightness information of the display device. While meeting the power supply requirements of the driving circuit and the display panel and ensuring the picture quality displayed by the display panel, it avoids excessive power consumption of the display device caused by excessive voltage provided by the power management chip, which is beneficial to reducing the power consumption of the display device.

[0030] Reference Figure 1 The display device 100 provided in the embodiment of the present application includes a power management chip 10, a display driver chip 20 and a display panel 30. Among them, the display driver chip 20 includes a driving circuit 21 and a main control circuit 22. The power management chip 10 is connected to the driving circuit 21 and is configured to provide a first voltage to the driving circuit 21. The driving circuit 21 is connected to the display panel 30 and is configured to drive the display panel 30 to work. The main control circuit 22 is configured to obtain the brightness information of the display device 100, and control the driving circuit 21 to drive the display panel 30 to work according to the brightness information, so as to adjust the brightness of the display screen of the display panel 30. The main control circuit 22 is also configured to adjust the first voltage provided by the power management chip 10 according to the brightness information.

[0031] Reference Figure 2 , the voltage regulation method comprises: step 011: obtaining brightness information of the display device 100, the brightness information is used to adjust the brightness of the display screen of the display panel 30;

[0032] Step 012: Adjust the first voltage according to the brightness information.

[0033] Specifically, the cooperation between the display driver chip 20 (Display Driver IC, DDIC) and the display panel 30 is the core of the display device 100 to realize the display function. The display driver chip 20 may include a driving circuit 21 and a main control circuit 22. The main control circuit 22 is used to provide a control signal to the driving circuit 21 to control the driving circuit 21 to provide accurate electrical signals to the display panel 30, and the display panel 30 presents images according to these signals. For example, the main control circuit 22 can provide a control signal to the driving circuit 21, and the driving circuit 21 can provide a driving signal to the display panel 30 to drive each pixel on the display panel 30 to display different colors and brightness, so as to adjust the brightness, contrast, color balance and other parameters of the display device 100.

[0034] The power management IC 10 (PMIC) is responsible for controlling and distributing power to each module in the display device 100 to meet the power supply requirements of each module in the display device 100. The voltages provided by the power management IC 10 can be recorded as voltage AVDD, voltage VDDIO, voltage DVDD and voltage VCI.

[0035] The voltage AVDD is provided to the driving circuit 21 of the display panel 30 and is used as a bias voltage for the display panel 30. The voltage value of AVDD can be between 3.3V and 15V. The voltage AVDD directly affects the display effect, especially in terms of color presentation and image clarity. If the AVDD voltage is unstable or does not meet the requirements of the display device 100, problems such as color distortion and unclear display may occur.

[0036] The voltage VDDIO is usually used to provide voltage for the logic interface part (such as the signal processing circuit) of the display device 100 , and can be used to power the display driver chip 20 and the external communication interface (such as I2C, SPI, etc.), which is related to the working logic of the display panel 30 .

[0037] The voltage DVDD is used to provide voltage for the digital circuits of the display panel 30, especially the digital signal processing part. The voltage DVDD directly affects the processing speed and accuracy of the display. Especially in the display device 100 with high resolution and fast refresh rate, the voltage DVDD needs to be stable to avoid tearing or freezing of the image.

[0038] The voltage VCI is the operating voltage provided for the display driver chip 20 . The stability of the voltage VCI affects the brightness and color accuracy of the display panel 30 . Especially at a higher brightness setting, the voltage VCI needs to be sufficiently stable to ensure that the display effect does not change.

[0039] The voltage AVDD output by the power management chip 10 needs to match the requirements of the display panel 30. The display panel 30 in different working modes has different requirements for driving voltage, so it is necessary to accurately control the voltage AVDD output by the power management chip 10 to ensure that the display panel 30 in different working modes can work normally.

[0040] The voltage AVDD output by the power management chip 10 also needs to consider the power consumption requirements of the display panel 30. Especially in mobile devices, reasonable power management can extend battery life. The display driver chip 20 can dynamically adjust the voltage and current to achieve power consumption optimization.

[0041] The voltage AVDD output by the power management chip 10 can be recorded as the first voltage, and the voltage regulation method provided in the embodiment of the present application is used to regulate the voltage AVDD.

[0042] In step 011, the brightness information may be derived from the brightness information adaptively adjusted by the display device 100. For example, when the brightness is too high, the display device 100 may automatically adjust the brightness information to a lower level, and the main control circuit 22 may obtain the brightness information to control the driving circuit 21 to adjust the brightness of the display screen of the display panel 30 according to the brightness information.

[0043] The brightness information may also be derived from manually adjusted brightness information. For example, it may be considered that the brightness information is manually adjusted down, and the main control circuit 22 may obtain the brightness information so as to control the driving circuit 21 to adjust the brightness of the display screen of the display panel 30 down according to the brightness information.

[0044] In step 012, the voltage to which the first voltage of the display device 100 needs to be adjusted at different brightnesses is pre-written into the main control circuit 22 as a lookup table. The lookup table can refer to Table 1. In Table 1, Luminance displays the value of brightness information in nits, and AVDD displays the value of the first voltage in V.

[0045]

[0046] Table 1

[0047] In the related art, the display device 100 provides the same first voltage at different brightness levels. The specific relationship between Luminance and AVDD can be referred to Table 2.

[0048]

[0049] Table 2

[0050] During the operation of the display device 100, the first voltage can be adjusted according to the position of the brightness information of the display device 100 in the lookup table, while meeting the power supply requirements of the driving circuit 21 and the display panel 30 and ensuring the picture quality displayed by the display panel 30, it avoids excessive power consumption of the display device 100 caused by excessive voltage provided by the power management chip 10, which is beneficial to reducing the power consumption of the display device 100.

[0051] In some embodiments, in the process of adjusting the first voltage according to the brightness information, the value of the brightness information is positively correlated with the value to which the first voltage needs to be adjusted.

[0052] In step 012, referring to Table 1, the larger the value displayed by Luminance, the larger the value displayed by AVDD. Therefore, in the process of adjusting the first voltage according to the brightness information, the larger the value of the brightness information, the larger the value to which the first voltage needs to be adjusted.

[0053] Reference Figure 4 In some embodiments, the display device 100 further includes a voltage conversion circuit 23 , the power management chip 10 is connected to the display panel 30 via the voltage conversion circuit 23 , and the voltage conversion circuit 23 is configured to convert the first voltage into a second voltage for the display panel 30 .

[0054] Step 012: adjusting the first voltage according to the brightness information, including:

[0055] Step 013: determining the data voltage required by the pixel on the display panel 30 according to the brightness information;

[0056] Step 014: adjusting the first voltage according to the data voltage so that the second voltage is consistent with the data voltage.

[0057] Specifically, the display driver chip 20 further includes a voltage conversion circuit 23 , the power management chip 10 is connected to the display panel 30 via the voltage conversion circuit 23 , and the voltage conversion circuit 23 is configured to convert a first voltage into a second voltage for the display panel 30 .

[0058] A low dropout regulator (LDO) may be provided in the display driver chip 20 . The power management chip 10 is connected to the display panel 30 via the LDO circuit. The second voltage output by the LDO circuit may be provided to the display panel 30 as a pixel data voltage.

[0059] In Table 1, Luminance displays the value of brightness information, AVDD displays the value of the first voltage, and VGMP displays the value of the second voltage. The voltage value connected to the input end of the voltage conversion circuit 23 can be AVDD, the voltage provided by the output end of the voltage conversion circuit 23 can be VGMP, and the second voltage is the voltage obtained by stepping down the first voltage by the voltage conversion circuit 23. According to the design requirements of the LDO circuit in the display driver chip 20, AVDD-0.4V>VGMP. This application takes AVDD-0.5V=VGMP, and AVDD depends on VGMP, that is, the data voltage required for the pixels on the display panel 30.

[0060] In some implementations, step 013: determining the data voltage required by the pixel on the display panel 30 according to the brightness information includes:

[0061] Step 015: determining the gamma voltage of the display device 100 displaying a pure black picture according to the brightness information, wherein the value of the brightness information is positively correlated with the value of the gamma voltage of the display device 100 displaying a pure black picture;

[0062] Step 016: Determine the data voltage required by the pixel on the display panel 30 according to the gamma voltage of the display device 100 displaying a pure black picture.

[0063] Specifically, when the display device 100 displays a pure black picture, the required gamma voltage is the largest. At this time, the data voltage required by the pixels on the display panel 30 is the largest. That is to say, when the required gamma voltage is the largest when the display device 100 displays a pure black picture, the first voltage and the second voltage that the power management chip 10 needs to provide are the largest. Therefore, when the power supply requirements of the display device 100 displaying a pure black picture are met, the power supply requirements of the driving circuit 21 and the display panel 30 can be ensured to be met.

[0064] In step 015, there is a corresponding relationship between the brightness displayed by the display device 100 and the gamma voltage required when the display device 100 displays a pure black screen. When the brightness displayed by the display device 100 increases, the gamma voltage required when the display device 100 displays a pure black screen increases.

[0065] In step 016, there is a corresponding relationship between the gamma voltage of the display device 100 displaying a pure black picture and the data voltage required by the pixels on the display panel 30. When the gamma voltage of the display device 100 displaying a pure black picture increases, the data voltage required by the pixels on the display panel 30 increases.

[0066] Referring to Table 1 and Table 2, the present application takes AVDD-0.5V=VGMP, and AVDD depends on VGMP, that is, the gamma voltage required when the display device 100 displays a pure black picture.

[0067] Through experiments, it can be determined that when the value of Luminance display brightness information is 1800, the gamma voltage required when the display device 100 displays a pure black screen is 6V. Considering the deviation between the modules of the display device 100 and the influence of the ambient temperature on the characteristics of the display device 100, the data voltage required by the pixels on the display panel 30 needs to increase the gamma voltage required when the display device 100 displays a pure black screen by 0.5V.

[0068] like Figure 4 As shown in the figure, when testing different brightness, the minimum VGMP voltage required for the display device 100 to display a pure black screen, it can be seen that the VGMP voltage decreases as the brightness decreases, and the VGMP at the lowest brightness is about 0.6V lower than the VGMP at the highest brightness. When the value of the Luminance display brightness information is 1800, the VGMP voltage is 6V+0.5V=6.5V.

[0069] Calculate the power loss saved by AVDD at 2nit. Refer to Table 1. When Luminance is 2nit, the value of AVDD is 6.38V. If the impedance is R2 at this time, the power consumed by AVDD P1 is 6.38*6.38 / R2. Refer to Table 2. When Luminance is 2nit, the value of AVDD is 7V. If the impedance is R1 at this time, the power consumed by AVDD P2 is 7*7 / R1. When the load impedance remains unchanged, that is, R1=R2, P1 / P2=6.38*6.38 / 7*7=83.1%. Compared with P2, the power saved by P1 is (7*7 / -6.38*6.38) / (7*7)=16.9%.

[0070] Reference Figure 5 The display device 100 provided in the embodiment of the present application may also include a temperature sensor 40. The temperature sensor 40 is configured to detect the temperature of the display device 100. The main control circuit 22 is connected to the temperature sensor 40 to obtain temperature information. The main control circuit 22 is also configured to adjust the first voltage provided by the power management chip 10 according to the brightness information and the temperature information.

[0071] Reference Figure 6 , in some embodiments, the voltage regulation method further includes: Step 021: acquiring temperature information and brightness information of the display device 100;

[0072] Step 022: Adjust the first voltage according to the temperature information and the brightness information.

[0073] In step 021, the brightness information may be derived from the brightness information adaptively adjusted by the display device 100. For example, when the brightness is too high, the display device 100 may automatically adjust the brightness information to a lower level, and the main control circuit 22 may obtain the brightness information to control the driving circuit 21 to adjust the brightness of the display screen of the display panel 30 according to the brightness information.

[0074] The brightness information may also be derived from manually adjusted brightness information. For example, it may be considered that the brightness information is manually adjusted down, and the main control circuit 22 may obtain the brightness information so as to control the driving circuit 21 to adjust the brightness of the display screen of the display panel 30 down according to the brightness information.

[0075] The temperature information comes from information detected by the temperature sensor 40 .

[0076] In step 022 , the voltage to which the first voltage of the display device 100 needs to be adjusted at different brightnesses and different temperatures is pre-written into the main control circuit 22 as a lookup table.

[0077] For example, referring to Table 3, the different brightnesses and the voltages to which the first voltage of the display device 100 needs to be adjusted in a temperature environment of 85 degrees are pre-written into the main control circuit 22 as a lookup table, and the different brightnesses and the voltages to which the first voltage of the display device 100 needs to be adjusted in a temperature environment of 25 degrees are pre-written into the main control circuit 22 as a lookup table.

[0078]

[0079] Table 3

[0080] During the operation of the display device 100, the first voltage can be adjusted according to the position of the brightness information and temperature information of the display device 100 in the lookup table, while meeting the power supply requirements of the driving circuit 21 and the display panel 30 and ensuring the picture quality displayed by the display panel 30, it avoids excessive power consumption of the display device 100 caused by excessive voltage provided by the power management chip 10, which is beneficial to reducing the power consumption of the display device 100.

[0081] In some embodiments, in the process of adjusting the first voltage according to the brightness information and the temperature information, the value of the brightness information is positively correlated with the value to which the first voltage needs to be adjusted, and the value of the temperature information is positively correlated with the value to which the first voltage needs to be adjusted.

[0082] In step 022, referring to Table 3, under the same ambient temperature, the larger the value displayed by Luminance, the larger the value displayed by AVDD. Therefore, in the process of adjusting the first voltage according to the brightness information, the larger the value of the brightness information, the larger the value to which the first voltage needs to be adjusted.

[0083] For example, when the temperature environment is 85 degrees, as the value displayed by Luminance increases, the value displayed by AVDD increases. When Luminance is 2, AVDD is 6.38; when Luminance is 10, AVDD is 6.6; when Luminance is 25, AVDD is 6.68; when Luminance is 50, AVDD is 6.7; when Luminance is 120, AVDD is 6.79; when Luminance is 200, AVDD is 6.8; when Luminance is 400, AVDD is 6.9; when Luminance is 800, AVDD is 6.95; when Luminance is 1200, AVDD is 6.98; when Luminance is 1800, AVDD is 7.

[0084] For example, when the temperature environment is 25 degrees, as the value displayed by Luminance increases, the value displayed by AVDD increases. When Luminance is 2, AVDD is 6.08; when Luminance is 10, AVDD is 6.3; when Luminance is 25, AVDD is 6.38; when Luminance is 50, AVDD is 6.4; when Luminance is 120, AVDD is 6.49; when Luminance is 200, AVDD is 6.5; when Luminance is 400, AVDD is 6.6; when Luminance is 800, AVDD is 6.65; when Luminance is 1200, AVDD is 6.68; when Luminance is 1800, AVDD is 6.7.

[0085] Referring to Table 3, when the values ​​displayed by Luminance are the same, the value displayed by AVDD corresponding to a temperature environment of 25 degrees is smaller than the value displayed by AVDD corresponding to a temperature environment of 85 degrees. Therefore, in the process of adjusting the first voltage according to the brightness information, the larger the value of the temperature information is, the larger the value to which the first voltage needs to be adjusted.

[0086] For example, when Luminance is 2, the AVDD corresponding to the temperature environment of 25 degrees is 6.08, and the AVDD corresponding to the temperature environment of 85 degrees is 6.38; when Luminance is 10, the AVDD corresponding to the temperature environment of 25 degrees is 6.3, and the AVDD corresponding to the temperature environment of 85 degrees is 6.6; when Luminance is 25, the AVDD corresponding to the temperature environment of 25 degrees is 6.38, and the AVDD corresponding to the temperature environment of 85 degrees is 6.68; when Luminance is 50, the AVDD corresponding to the temperature environment of 25 degrees is 6.4, and the AVDD corresponding to the temperature environment of 85 degrees is 6.7; when Luminance is 120, the AVDD corresponding to the temperature environment of 25 degrees is 6.49, and the AVDD corresponding to the temperature environment of 85 degrees is 6.79; When the Luminance is 200, the AVDD corresponding to the temperature environment of 25 degrees is 6.5, and the AVDD corresponding to the temperature environment of 85 degrees is 6.8; when the Luminance is 400, the AVDD corresponding to the temperature environment of 25 degrees is 6.6, and the AVDD corresponding to the temperature environment of 85 degrees is 6.9; when the Luminance is 800, the AVDD corresponding to the temperature environment of 25 degrees is 6.65, and the AVDD corresponding to the temperature environment of 85 degrees is 6.95; when the Luminance is 1200, the AVDD corresponding to the temperature environment of 25 degrees is 6.68, and the AVDD corresponding to the temperature environment of 85 degrees is 6.98; when the Luminance is 1800, the AVDD corresponding to the temperature environment of 25 degrees is 6.7, and the AVDD corresponding to the temperature environment of 85 degrees is 7.

[0087] In some embodiments, step 022: adjusting the first voltage according to the temperature information and the brightness information includes:

[0088] Step 023: determining the data voltage required by the pixel on the display panel 30 according to the brightness information and the temperature information;

[0089] Step 024: Adjust the first voltage according to the data voltage so that the second voltage is consistent with the data voltage.

[0090] Specifically, the display driver chip 20 further includes a voltage conversion circuit 23 , the power management chip 10 is connected to the display panel 30 via the voltage conversion circuit 23 , and the voltage conversion circuit 23 is configured to convert a first voltage into a second voltage for the display panel 30 .

[0091] A low dropout regulator (LDO) may be provided in the display driver chip 20 . The power management chip 10 is connected to the display panel 30 via the LDO circuit. The second voltage output by the LDO circuit may be provided to the display panel 30 as a pixel data voltage.

[0092] In Table 3, Luminance displays the value of brightness information, AVDD displays the value of the first voltage, and VGMP displays the value of the second voltage.

[0093] In some implementations, step 023: determining the data voltage required by the pixel on the display panel 30 according to the temperature information and the brightness information includes:

[0094] Step 025: determining the gamma voltage of the display device 100 displaying a pure black picture according to the brightness information, wherein the value of the brightness information is positively correlated with the value of the gamma voltage of the display device 100 displaying a pure black picture;

[0095] Step 026: Determine the data voltage required by the pixel on the display panel 30 according to the gamma voltage and temperature information of the display device 100 displaying a pure black picture, and the value of the temperature information is positively correlated with the value of the data voltage.

[0096] Specifically, when the display device 100 displays a pure black picture, the required gamma voltage is the largest. At this time, the data voltage required by the pixels on the display panel 30 is the largest. That is to say, when the required gamma voltage is the largest when the display device 100 displays a pure black picture, the first voltage and the second voltage that the power management chip 10 needs to provide are the largest. Therefore, when the power supply requirements of the display device 100 displaying a pure black picture are met, the power supply requirements of the driving circuit 21 and the display panel 30 can be ensured to be met.

[0097] In step 015, there is a corresponding relationship between the brightness displayed by the display device 100 and the gamma voltage required when the display device 100 displays a pure black screen. When the brightness displayed by the display device 100 increases, the gamma voltage required when the display device 100 displays a pure black screen increases.

[0098] In step 016, there is a corresponding relationship between the gamma voltage of the display device 100 displaying a pure black picture and the data voltage required by the pixels on the display panel 30. When the gamma voltage of the display device 100 displaying a pure black picture increases, the data voltage required by the pixels on the display panel 30 increases.

[0099] Through experiments, it can be determined that when the value of Luminance display brightness information is 1800, the gamma voltage required for the display device 100 to display a pure black screen is 6V. When the ambient temperature is 85 degrees, considering the deviation between the modules of the display device 100 and the influence of the ambient temperature on the characteristics of the display device 100, the data voltage required by the pixels on the display panel 30 needs to increase the gamma voltage required by the display device 100 when the display device 100 displays a pure black screen by 0.5V.

[0100] When the ambient temperature is 25 degrees, considering the deviation between the modules of the display device 100 and the influence of the ambient temperature on the characteristics of the display device 100, the data voltage required by the pixels on the display panel 30 needs to increase the gamma voltage required by the display device 100 when displaying a pure black picture by 0.2V.

[0101] like Figure 7 As shown, when testing different brightness levels, the minimum VGMP voltage required when the display device 100 displays a pure black image can be seen. It can be seen that the VGMP voltage decreases as the brightness decreases.

[0102] When the ambient temperature is 85 degrees and the value of the Luminance display brightness information is 1800, the voltage of VGMP is 6V+0.5V=6.5V. When the ambient temperature is 25 degrees and the value of the Luminance display brightness information is 1800, the voltage of VGMP is 6V+0.2V=6.2V.

[0103] The display device 100 provided in the embodiment of the present application can be any device that displays whether it is moving (e.g., video) or fixed (e.g., still image) and whether it is text or image. More specifically, the display device 100 can be one of a variety of electronic devices, and the embodiment can be implemented in a variety of electronic devices or associated with a variety of electronic devices. A variety of electronic devices such as (but not limited to) mobile phones, wireless devices, personal data assistants (PS1), handheld or portable computers, GPS receivers / navigators, cameras, MP4 video players, cameras, game consoles, watches, clocks, calculators, TV monitors, flat panel displays, computer monitors, car displays (e.g., mileage displays, etc.), navigators, cockpit controllers and / or displays, camera view displays (e.g., displays of rearview cameras in vehicles), electronic photos, electronic billboards or display boards, projectors, architectural structures, packaging and aesthetic structures (e.g., displays of images of a piece of jewelry), etc. The embodiments of the present disclosure do not impose special restrictions on the specific form of the above-mentioned display device 100.

[0104] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0105] In addition, the term "connection" should be understood in a broad sense, for example, it can include fixed connection, detachable connection, or integral connection; it can include direct connection, indirect connection through an intermediate medium, and internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0106] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0107] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0108] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A voltage regulation method for a display device, characterized in that: The display device includes a power management chip, a driving circuit and a display panel, the power management chip is connected to the driving circuit and is configured to provide a first voltage to the driving circuit, the driving circuit is connected to the display panel and is configured to drive the display panel to work, and the voltage adjustment method includes: Acquiring brightness information of the display device, wherein the brightness information is used to adjust the brightness of a picture displayed by the display panel; The first voltage is adjusted according to the brightness information.

2. The voltage regulation method according to claim 1, characterized in that: In the process of adjusting the first voltage according to the brightness information, the value of the brightness information is positively correlated with the value to which the first voltage needs to be adjusted.

3. The voltage regulation method according to claim 1, characterized in that: The display device further includes a voltage conversion circuit, the power management chip is connected to the display panel via the voltage conversion circuit, the voltage conversion circuit is configured to convert the first voltage into a second voltage for the display panel, and the adjusting the first voltage according to the brightness information includes: Determining the data voltage required by the pixel on the display panel according to the brightness information; The first voltage is adjusted according to the data voltage so that the second voltage is consistent with the data voltage.

4. The voltage regulation method according to claim 3, characterized in that: The step of determining the data voltage required by the pixel on the display panel according to the brightness information includes: Determining a gamma voltage when the display device displays a pure black picture according to the brightness information, wherein a value of the brightness information is positively correlated with a value of the gamma voltage when the display device displays a pure black picture; The data voltage required by the pixels on the display panel is determined according to the gamma voltage of the display device displaying a pure black picture.

5. The voltage regulation method according to claim 1, characterized in that: The voltage regulation method further comprises: Acquiring temperature information and brightness information of the display device; The first voltage is adjusted according to the temperature information and the brightness information.

6. The voltage regulation method according to claim 5, characterized in that: In the process of adjusting the first voltage according to the temperature information and the brightness information, the value of the brightness information is positively correlated with the value to which the first voltage needs to be adjusted, and the value of the temperature information is positively correlated with the value to which the first voltage needs to be adjusted.

7. The voltage regulation method according to claim 5, characterized in that: The display device further includes a voltage conversion circuit, the power management chip is connected to the display panel via the voltage conversion circuit, the voltage conversion circuit is configured to convert the first voltage into a second voltage for the display panel, and the adjusting the first voltage according to the temperature information and the brightness information includes: Determining a data voltage required by a pixel on the display panel according to the brightness information and the temperature information; The first voltage is adjusted according to the data voltage so that the second voltage is consistent with the data voltage.

8. The voltage regulation method according to claim 7, characterized in that: The determining the data voltage required by the pixel on the display panel according to the temperature information and the brightness information includes: Determining a gamma voltage when the display device displays a pure black picture according to the brightness information, wherein a value of the brightness information is positively correlated with a value of the gamma voltage when the display device displays a pure black picture; The data voltage required by the pixel on the display panel is determined according to the gamma voltage of the display device displaying a pure black picture and the temperature information, and the value of the temperature information is positively correlated with the value of the data voltage.

9. A display device, characterized in that: The display device comprises: Display panel; A display driver chip, comprising a driver circuit and a main control circuit, wherein the driver circuit is connected to the display panel, and the main control circuit is configured to obtain brightness information of the display device, and control the driver circuit to drive the display panel to work according to the brightness information, so as to adjust the brightness of the picture displayed by the display panel; A power management chip is connected to the driving circuit and is configured to provide a first voltage to the driving circuit. The main control circuit is further configured to adjust the first voltage provided by the power management chip according to the brightness information.

10. The display device according to claim 9, characterized in that: The display device further includes: A temperature sensor, wherein the temperature sensor is configured to detect the temperature of the display device, and the main control circuit is connected to the temperature sensor to obtain the temperature information; The main control circuit is further configured to adjust the first voltage provided by the power management chip according to the brightness information and the temperature information.

11. The display device according to claim 10, characterized in that: The display driver chip further includes a voltage conversion circuit, the power management chip is connected to the display panel via the voltage conversion circuit, and the voltage conversion circuit is configured to convert the first voltage into a second voltage for the display panel; The main control circuit is also configured to determine the data voltage required by the pixels on the display panel based on the brightness information, or to determine the data voltage required by the pixels on the display panel based on the brightness information and the temperature information. The main control device is also configured to adjust the first voltage based on the data voltage so that the second voltage is consistent with the data voltage.

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