Method for obtaining analog power voltage, obtaining module and display device

Abstract

This invention provides a method, module, and display device for acquiring simulated power supply voltage, relating to the field of display technology. It is used to acquire the simulated power supply voltage required for the operation of a display driver chip, thereby reducing the power consumption of the display driver chip. The simulated power supply voltage is provided to the display driver chip, which drives the display panel. The method for acquiring the simulated power supply voltage includes: providing a minimum grayscale test voltage to the display driver chip; acquiring the actual brightness of the display panel under the minimum grayscale test voltage; adjusting the minimum grayscale test voltage according to the actual brightness of the display panel, and using the minimum grayscale test voltage at which the actual brightness of the display panel reaches the target dark state brightness as the first main gamma voltage; and obtaining the simulated power supply voltage based on the first main gamma voltage.

Description

[0001] The present application relates to display technology field, especially to a kind of analog power supply voltage acquisition method, acquisition module and display device.

[0002] As an important component of information industry, display technology has played a very important role in the development of information technology, and its application fields are in industry, transportation, communication, education, aerospace, satellite remote sensing, entertainment, medical treatment and other aspects of daily life, and it is an important pillar of information industry.

[0003] Display panel and display driving chip are the key components of display technology. Display panel works under the driving of display driving chip, and display driving chip needs to receive analog power supply voltage AVDD. The size of analog power supply voltage AVDD will not only affect the normal work of display driving chip, but also directly affect the power consumption of display driving chip.

[0004] Due to the structure, material or production process fluctuation of different display panels, the value of analog power supply voltage AVDD required by different display panels for work will be different. How to provide display driving chip with analog power supply voltage AVDD that can normally drive display panel and has low power consumption has become the focus of researchers.

[0005] Therefore, the present application provides an analog power supply voltage acquisition method, acquisition module and display device.

[0006] On the one hand, the present application provides an analog power supply voltage acquisition method, which is used to provide display driving chip, and display driving chip is used to drive display panel. The acquisition method comprises:

[0007] Providing minimum gray scale test voltage to display driving chip, and collecting actual brightness of display panel under minimum gray scale test voltage;

[0008] Adjusting minimum gray scale test voltage according to actual brightness of display panel, and taking minimum gray scale test voltage when actual brightness of display panel reaches target dark state brightness as first main gamma voltage;

[0009] Obtaining analog power supply voltage according to first main gamma voltage.

[0010] On the other hand, the present application provides an analog power supply voltage acquisition module, which is used to provide display driving chip, and display driving chip is used to drive display panel. The acquisition module comprises:

[0011] ​​​The minimum grayscale test voltage providing unit is used to provide the minimum grayscale test voltage to the display driver chip;

[0012] The brightness acquisition unit is used to acquire the actual brightness of the display panel under the minimum grayscale test voltage;

[0013] The first main gamma voltage acquisition unit is used as the minimum grayscale test voltage when the actual brightness of the display panel reaches the target dark state brightness as the first main gamma voltage.

[0014] The analog power supply voltage acquisition unit is used to obtain the analog power supply voltage based on the first main gamma voltage.

[0015] In another aspect, embodiments of the present invention provide a display device, including a display panel and a display driver chip. The display driver chip is used to receive an analog power supply voltage, which is obtained according to the above-described acquisition method. The display driver chip is electrically connected to the display panel.

[0016] The method, module, and display device for obtaining simulated power supply voltage provided in this invention first obtain a first main gamma voltage. This first main gamma voltage matches the material, structure, or process characteristics of the display panel, and under this first main gamma voltage, the actual brightness of the display panel can reach the target dark state brightness. Then, based on the first main gamma voltage, a simulated power supply voltage that meets the requirements of the first main gamma voltage can be obtained, avoiding situations where the simulated power supply voltage is too high or too low. When the display device is working, based on the setting method provided in this invention, on the one hand, it can avoid the problem of the display panel being unable to display the target dark state brightness due to setting the simulated power supply voltage too low, which is beneficial to improving the display effect of the display panel; on the other hand, it can also avoid the problem of excessive power consumption of the display driver chip due to setting the simulated power supply voltage too high, which is beneficial to reducing the power consumption of the display driver chip.

[0017] Furthermore, by providing a minimum grayscale test voltage to the display driver chip and acquiring the actual brightness of the display panel under the minimum grayscale test voltage, and adjusting the minimum grayscale test voltage provided to the display driver chip according to the actual brightness of the display panel, the minimum grayscale test voltage when the actual brightness of the display panel reaches the target dark state brightness is taken as the first main gamma voltage. Through this dynamic adjustment process, the accuracy of the acquired first main gamma voltage can be improved, which is beneficial to further ensuring the accuracy of the acquired analog power supply voltage. [Attached Image Description]

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of a display device provided in an embodiment of the present invention;

[0020] Figure 2 A flowchart illustrating a method for obtaining analog power supply voltage according to an embodiment of the present invention;

[0021] Figure 3 This is a partial circuit diagram of a display driver chip provided in an embodiment of the present invention;

[0022] Figure 4 A flowchart illustrating another method for obtaining analog power supply voltage according to an embodiment of the present invention;

[0023] Figure 5 A schematic diagram of a module for acquiring analog power supply voltage provided in an embodiment of the present invention;

[0024] Figure 6 A schematic diagram of a minimum grayscale test voltage providing unit provided in an embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of a gamma data acquisition unit provided in an embodiment of the present invention.

Detailed Implementation Methods

[0026] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0029] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0030] It should be understood that although the terms "first," "second," etc., may be used to describe the main gamma voltages in embodiments of the present invention, these main gamma voltages should not be limited to these terms. These terms are only used to distinguish the different main gamma voltages from one another. For example, without departing from the scope of embodiments of the present invention, a first main gamma voltage may also be referred to as a second main gamma voltage, and similarly, a second main gamma voltage may also be referred to as a first main gamma voltage.

[0031] like Figure 1 As shown, Figure 1 This is a schematic diagram of a display device provided in an embodiment of the present invention. The display device includes a display driver integrated circuit (DDIC) 1, a display panel 2, and a power management chip 3. Exemplarily, the power management chip 3 is electrically connected to both the display driver chip 1 and the display panel 2. The display driver chip 1 is electrically connected to the display panel 2. When the display device is operating, the display driver chip 1 generates a first main gamma voltage VGMP based on the analog power supply voltage AVDD provided by the power management chip 3, and provides a corresponding gamma data voltage between the first main gamma voltage VGMP and the second main gamma voltage VGSP to the display panel 2 based on the received image data, thereby driving the display panel to light up. The first main gamma voltage VGMP corresponds to the minimum grayscale brightness of the display panel 2, i.e., the dark state brightness. The second main gamma voltage VGSP corresponds to the maximum grayscale brightness of the display panel 2. Exemplarily, the first main gamma voltage VGMP is greater than the second main gamma voltage VGSP. Taking the image data received by the display panel 2 as including 8-bit digital signals as an example, each data channel of the display driver chip 1 can provide 2... 8 That is, 256 gamma data voltages, the minimum gray level is 0 gray level, and the maximum gray level is 255 gray level.

[0032] In implementing the embodiments of the present invention, the inventors discovered that due to fluctuations in structure, materials, or processes, the first main gamma voltage VGMP required for the operation of different display panels 2 can vary. In related technologies, when setting the aforementioned simulated power supply voltage AVDD, a small number, such as twenty display panels 2, is typically selected as a sample. The simulated power supply voltage AVDD is obtained based on the maximum value of the first main gamma voltage VGMP of these samples, and this obtained simulated power supply voltage AVDD is applied to all new products, in numbers far exceeding the sample size. Therefore, for display panels where the actual required first main gamma voltage VGMP is less than the aforementioned maximum value, the simulated power supply voltage AVDD set according to the above method will be too large, resulting in higher power consumption of the display driver chip 1. For display panels where the actual required first main gamma voltage VGMP is greater than the aforementioned maximum value, the simulated power supply voltage AVDD set according to the above method will be too small, resulting in a smaller first main gamma voltage VGMP, which in turn will cause the display panel to fail to achieve the target dark state brightness.

[0033] In view of this, embodiments of the present invention provide a method for obtaining an analog power supply voltage, which is used to provide a power supply voltage to... Figure 1 The display driver chip 1 shown is used to drive the display panel 2. Combined with... Figure 2 As shown, Figure 2 This is a flowchart illustrating a method for obtaining a simulated power supply voltage according to an embodiment of the present invention. The method includes:

[0034] Step S1: Provide a minimum grayscale test voltage VGMP0 to the display driver chip 1, and acquire the actual brightness of the display panel 2 under the minimum grayscale test voltage VGMP0. In this process, for example, an optical measuring instrument can be used to acquire the actual brightness of the display panel 2 in real time. Optionally, the optical measuring instrument includes a charge-coupled device (CCD) image sensor.

[0035] Step S2: Based on the actual brightness of the display panel 2, adjust the minimum grayscale test voltage VGMP0 provided to the display driver chip 1. Use the minimum grayscale test voltage at which the actual brightness of the display panel 2 reaches the target dark state brightness as the first main gamma voltage VGMP. Optionally, the target dark state brightness can be adjusted according to different application scenarios or different debugging accuracy requirements of the display panel 2. For example, in this embodiment of the invention, the target dark state brightness can be set to 0.001 nit. The actual brightness of the display panel 2 reaching the target dark state brightness means that the actual brightness of the display panel 2 is less than or equal to the target dark state brightness.

[0036] Step S3: Based on the first main gamma voltage VGMP mentioned above, obtain the analog power supply voltage AVDD.

[0037] Optional, combined Figure 3 As shown, Figure 3 This is a partial circuit diagram of a display driver chip provided in an embodiment of the present invention. The display driver chip 1 includes a first main gamma voltage generation circuit 11 and a gamma voltage generation circuit 12. When the display device is working, the first main gamma voltage generation circuit 11 can receive the analog power supply voltage AVDD and generate a first main gamma voltage VGMP based on the analog power supply voltage AVDD. In this embodiment of the present invention, the correspondence between the first main gamma voltage VGMP and the analog power supply voltage AVDD can be obtained according to the structure of the first main gamma voltage generation circuit 11. After obtaining the first main gamma voltage VGMP that meets the target dark state brightness requirement, the accurate analog power supply voltage AVDD can be obtained according to the above correspondence.

[0038] Optionally, the first main gamma voltage generation circuit 11 can employ a buck circuit or other circuit structure with adjustable output voltage. For example, the value of the first main gamma voltage VGMP is V... GMP The value of the simulated power supply voltage AVDD is V. AVDD , where V AVDD =V GMP +C, 0.3V≤C≤0.5V.

[0039] The method for obtaining the simulated power supply voltage AVDD provided in this embodiment of the invention first obtains a first main gamma voltage VGMP. The first main gamma voltage VGMP matches the structure, material, or process characteristics of the display panel 2. Under the first main gamma voltage VGMP, the actual brightness of the display panel 2 is less than or equal to the target dark state brightness. Then, based on the first main gamma voltage VGMP, a simulated power supply voltage AVDD that meets the requirements of the first main gamma voltage VGMP can be obtained, thus avoiding situations where the simulated power supply voltage AVDD is too large or too small. When the display device is working, based on the setting method provided in this embodiment of the invention, on the one hand, it can avoid the problem of the display panel 2 being unable to display the target dark state brightness due to setting the simulated power supply voltage AVDD too small, which is beneficial to improving the display effect of the display panel 2; on the other hand, it can also avoid the problem of excessive power consumption of the display driver chip 1 due to setting the simulated power supply voltage AVDD too large, which is beneficial to reducing the power consumption of the display driver chip 1.

[0040] Furthermore, this embodiment of the invention provides a minimum grayscale test voltage VGMP0 to the display driver chip 1, collects the actual brightness of the display panel 2 under the minimum grayscale test voltage, and adjusts the minimum grayscale test voltage VGMP0 provided to the display driver chip 1 according to the actual brightness of the display panel 2. The minimum grayscale test voltage when the actual brightness of the display panel 2 is less than or equal to the target dark state brightness is taken as the first main gamma voltage VGMP. Through this dynamic adjustment process, the accuracy of the obtained first main gamma voltage VGMP can be improved, which is beneficial to further ensure the accuracy of the obtained analog power supply voltage AVDD.

[0041] For example, in embodiments of the present invention, the analog power supply voltage AVDD required for the operation of each display driver chip 1 bound to different display panels 2 can be obtained according to the above method, so that the analog power supply voltage AVDD can be matched with the structure, material or process characteristics of the display panel 2.

[0042] For example, such as Figure 2 As shown, before providing the minimum grayscale test voltage VGMP0 to the display driver chip 1 in step 1 above, the method for obtaining the analog power supply voltage AVDD provided in this embodiment of the invention further includes:

[0043] Step S0: Perform a power-on operation on the display driver chip 1 according to the preset power-on sequence.

[0044] For example, in combination Figure 4 As shown, Figure 4 This is a flowchart illustrating another method for obtaining simulated power supply voltage according to an embodiment of the present invention. The method for adjusting the minimum grayscale test voltage VGMP0 based on the actual brightness of the display panel 2 in step S2 includes:

[0045] Step S21: Compare the actual brightness of display panel 2 with the target dark state brightness; if the actual brightness of display panel 2 is greater than the target dark state brightness, proceed to step S22; if the actual brightness of display panel 2 is less than or equal to the target dark state brightness, proceed to step S23.

[0046] Step S22: Increase the minimum grayscale test voltage VGMP0 provided to the display driver chip 1 by a first preset step size ΔV1, and collect the actual brightness of the display panel 2 under the current minimum grayscale test voltage VGMP0. If the actual brightness of the display panel 2 is still greater than the target dark state brightness, continue to increase the minimum grayscale test voltage VGMP0 provided to the display driver chip 1 by the first preset step size ΔV1 until the actual brightness of the display panel 2 is less than or equal to the target dark state brightness. Then, use the current minimum grayscale test voltage VGMP0 as the first main gamma voltage VGMP.

[0047] Step S23: Decrease the minimum grayscale test voltage VGMP0 provided to the display driver chip 1 by a second preset step size ΔV2, and collect the actual brightness of the display panel 2 under the current minimum grayscale test voltage VGMP0. If the actual brightness of the display panel 2 is still less than or equal to the target dark state brightness, continue to decrease the minimum grayscale test voltage VGMP0 provided to the display driver chip 1 by the second preset step size ΔV2 until the actual brightness of the display panel 2 is greater than the target dark state brightness. The step S2 above, where the minimum grayscale test voltage VGMP0 for the actual brightness of the display panel 2 to reach the target dark state brightness, is used as the first main gamma voltage VGMP. This includes using the minimum value of multiple minimum grayscale test voltages VGMP0 when the actual brightness of the display panel 2 is less than or equal to the target dark state brightness as the first main gamma voltage VGMP.

[0048] Optionally, both the first preset step size ΔV1 and the second preset step size ΔV2 are greater than 0. For example, in embodiments of the present invention, they can be made equal, such as both being set to 0.01V. Alternatively, in embodiments of the present invention, the first preset step size ΔV1 and the second preset step size ΔV2 can be set to be unequal.

[0049] Optional, continue to combine Figure 2 As shown, the method for obtaining the analog power supply voltage AVDD also includes:

[0050] Step S4: Obtain the register setting value corresponding to the analog power supply voltage AVDD. For example, the display driver chip 1 includes a register, and the register setting value is a digital signal stored in the register.

[0051] Step S5: Program the above register settings and the first main gamma voltage VGMP to the display driver chip 1. For example, one-time programmable (OTP) or multi-time programmable (MTP) methods can be used for programming.

[0052] Combination Figure 1 As shown, the display driver chip 1 is electrically connected to the power management chip 3. When the display panel 2 is working, the display driver chip 1 can send the register setting value to the power management chip 3. The power management chip 3 can then generate a corresponding analog power supply voltage AVDD based on the register setting value. When the register setting value changes, the value of the analog power supply voltage AVDD will also change accordingly. Optionally, the register setting value corresponds to the number of power pulses, and the value of the analog power supply voltage AVDD changes with the number of power pulses. For example, when the number of power pulses is 48, the analog power supply voltage AVDD can be 6.1V. When the number of power pulses is 43, the analog power supply voltage AVDD can be 7.6V.

[0053] For example, see again Figure 2 After obtaining the register setting value in step S4 above, and before programming the register setting value and the first main gamma voltage VGMP to the display driver chip 1 in step S5 above, the method for obtaining the analog power supply voltage AVDD provided in this embodiment of the invention further includes:

[0054] Step S41: Write the first main gamma voltage VGMP and the register setting value into the display driver chip 1. Exemplarily, this step can be implemented in software, for example, through code debugging.

[0055] Step S42: Under the aforementioned first main gamma voltage VGMP and register setting value, gamma adjustment is performed on the display panel to obtain multiple gamma data voltages corresponding to different gray levels. The gamma data voltages are located between the aforementioned first main gamma voltage VGMP and second main gamma voltage VGSP.

[0056] When the display panel 2 is displaying, the display driver chip 1 can provide corresponding gamma data voltage to the data lines in the display panel 2 according to the received image data, so that the corresponding sub-pixels are lit up at the target grayscale. This process improves the display effect of the display panel, making the display effect of the display panel 2 more in line with the characteristics of the human eye. The gamma generation circuit 12 employs... Figure 3 The 6-bit architecture shown, where the display driver chip 1 supports 64 gray levels (G0 to G63), allows us to obtain 64 gamma data voltages (VGAM0 to VGAM63) corresponding to each of the 64 gray levels through this step. Alternatively, during gamma tuning, this embodiment of the invention can obtain only a portion of the gamma data voltages corresponding to some of the gray levels, while the gamma data voltages corresponding to other gray levels can be obtained through interpolation or other algorithms to improve the efficiency of gamma tuning.

[0057] For example, such as Figure 2 As shown, step S5 includes: burning the obtained multiple gamma data voltages and the aforementioned analog power supply voltage AVDD together into the display driver chip 1. When the display panel 2 is displaying, the gamma data voltages can be directly used to drive the display panel 2.

[0058] Optionally, the method for obtaining gamma data voltage by performing gamma adjustment on display panel 2 in step S42 above includes: providing data voltages corresponding to different gray levels to display panel 2, collecting the actual brightness of display panel 2 at different gray levels, and when the actual brightness of display panel 2 reaches the target brightness corresponding to each gray level, using the data voltage corresponding to each gray level as the gamma data voltage.

[0059] When it needs to be explained,Figure 3 Only the architectural diagram of the gamma voltage generation circuit 12 is shown. Any person skilled in the art can make various designs for the specific circuit within the scope of the technology disclosed in this invention, and these designs should all be covered within the protection scope of the embodiments of this invention.

[0060] For example, in combination Figure 2 As shown, after programming the above register settings and the first main gamma voltage VGMP to the display driver chip 1 in step S5, the method for obtaining the analog power supply voltage AVDD provided in this embodiment of the invention further includes:

[0061] Step S6: Light up display panel 2 with register settings and first main gamma voltage VGMP, collect the actual brightness of display panel 2, and read back the register settings and first main gamma voltage VGMP in display driver chip 1.

[0062] When the actual brightness of the display panel 2 is less than or equal to the target dark state brightness, and when the register setting value and the first main gamma voltage VGMP are correct, step S7 is executed;

[0063] Step S7: Perform a power-down operation on the display driver chip 1 according to the preset power-down sequence.

[0064] This invention also provides a module for obtaining the analog power supply voltage AVDD, such as... Figure 5 As shown, Figure 5 This is a schematic diagram of an analog power supply voltage acquisition module provided in an embodiment of the present invention. The acquisition module 4 includes a minimum grayscale test voltage providing unit 41, a brightness acquisition unit 42, a first main gamma voltage acquisition unit 43, and an analog power supply voltage acquisition unit 44. The minimum grayscale test voltage providing unit 41 is connected to the display driver chip (…). Figure 5 An electrical connection (not shown) is used to provide a minimum grayscale test voltage VGMP0 to the display driver chip 1. The brightness acquisition unit 42 is used to acquire the actual brightness of the display panel 2 under the minimum grayscale test voltage VGMP0. Exemplarily, the brightness acquisition unit 42 includes an optical measuring instrument. Optionally, the optical measuring instrument includes a CCD image sensor. The first main gamma voltage acquisition unit 43 is used to take the minimum grayscale test voltage VGMP0 when the actual brightness of the display panel 2 reaches the target dark state brightness as the first main gamma voltage VGMP. The analog power supply voltage acquisition unit 44 is used to obtain the analog power supply voltage AVDD based on the first main gamma voltage VGMP.

[0065] When acquiring the analog power supply voltage AVDD, the minimum grayscale test voltage VGMP0 can first be provided to the display driver chip 1 using the minimum grayscale test voltage providing unit 41, and the actual brightness of the display panel 2 under the minimum grayscale test voltage VGMP0 can be acquired in real time using the brightness acquisition unit 42. When the actual brightness of the display panel 2 is less than or equal to the target dark state brightness, the minimum grayscale test voltage VGMP0 can be used as the first main gamma voltage VGMP using the first main gamma voltage acquisition unit 43. Then, based on the first main gamma voltage VGMP, the analog power supply voltage AVDD can be obtained using the analog power supply voltage acquisition unit 44.

[0066] The analog power supply voltage AVDD acquisition module 3 provided in this embodiment of the invention first uses the first main gamma voltage acquisition unit 43 to acquire a first main gamma voltage VGMP that matches the structure, material, or process characteristics of the display panel 2. Under the first main gamma voltage VGMP, the actual brightness of the display panel 2 is less than or equal to the target dark state brightness. Then, based on the first main gamma voltage VGMP, the analog power supply voltage acquisition unit 44 obtains an analog power supply voltage AVDD that meets the requirements of the first main gamma voltage VGMP, avoiding situations where the analog power supply voltage AVDD is too large or too small. When the display device is working, based on the setting method provided in this embodiment of the invention, on the one hand, it can avoid the problem that the display panel 2 cannot display the target dark state brightness due to setting the analog power supply voltage AVDD too small, which is beneficial to improving the display effect of the display panel 2; on the other hand, it can also avoid the problem that the power consumption of the display driver chip 1 is too large due to setting the analog power supply voltage AVDD too large, which is beneficial to reducing the power consumption of the display driver chip 1.

[0067] Furthermore, in this embodiment of the invention, the minimum grayscale test voltage VGMP0 is provided to the display driver chip 1 by the minimum grayscale test voltage providing unit 41, and the actual brightness of the display panel 2 under the minimum grayscale test voltage is collected in real time by the brightness acquisition unit 42. Based on the actual brightness of the display panel 2, the minimum grayscale test voltage VGMP0 provided to the display driver chip 1 is adjusted by the minimum grayscale test voltage providing unit 41 until the actual brightness of the display panel 2 is less than or equal to the target dark state brightness. Then, the minimum grayscale test voltage is used as the first main gamma voltage VGMP by the first main gamma voltage acquisition unit 43. Through this dynamic adjustment process, the accuracy of the acquired first main gamma voltage VGMP can be improved, which is beneficial to further ensure the accuracy of the acquired analog power supply voltage AVDD.

[0068] For example, such as Figure 6 As shown, Figure 6This is a schematic diagram of a minimum grayscale test voltage providing unit provided in an embodiment of the present invention. In this embodiment, the minimum grayscale test voltage providing unit 41 includes a comparison unit 411, a first adjustment unit 412, and a second adjustment unit 413. The comparison unit 411 is used to compare the difference between the actual brightness of the display panel 2 and the target dark state brightness.

[0069] The first adjustment unit 412 is used to increase the minimum grayscale test voltage VGMP0 provided to the display driver chip 1 by a first preset step size ΔV1 when the actual brightness of the display panel 2 is greater than the target dark state brightness. During this process, the brightness acquisition unit 42 acquires the actual brightness of the display panel 2 in real time at the current minimum grayscale test voltage VGMP0, and the comparison unit 411 continues to compare the difference between the actual brightness of the display panel 2 and the target dark state brightness. Until the actual brightness of the display panel 2 is less than or equal to the target dark state brightness, the first adjustment unit 412 stops working, and the first main gamma voltage acquisition unit 43 uses the current minimum grayscale test voltage VGMP0, where the actual brightness of the display panel 2 is less than or equal to the target dark state brightness, as the first main gamma voltage VGMP.

[0070] The second adjustment unit 413 is used to reduce the minimum grayscale test voltage VGMP0 provided to the display driver chip 1 by a second preset step size ΔV2 when the actual brightness of the display panel 2 is less than or equal to the target dark state brightness. During this process, the brightness acquisition unit 42 acquires the actual brightness of the display panel 2 in real time at the current minimum grayscale test voltage VGMP0. The comparison unit 411 continues to compare the difference between the actual brightness of the display panel 2 and the target dark state brightness. If the actual brightness of the display panel 2 is still less than or equal to the target dark state brightness, the second adjustment unit 413 continues to reduce the minimum grayscale test voltage VGMP0 provided to the display driver chip 1 by a second preset step size ΔV2 until the actual brightness of the display panel 2 is greater than the target dark state brightness. At this point, the second adjustment unit 413 stops working, and the first main gamma voltage acquisition unit 43 uses the minimum value of the multiple minimum grayscale test voltages VGMP0 for which the actual brightness of the display panel 2 is less than or equal to the target dark state brightness as the first main gamma voltage VGMP.

[0071] Optional, such as Figure 5 As shown, in this embodiment of the invention, the acquisition module 4 further includes a register setting value acquisition unit 45 and a programming unit 46. The register setting value acquisition unit 45 is used to obtain the register setting value corresponding to the analog power supply voltage AVDD based on the analog power supply voltage AVDD. The programming unit 46 is used to program the register setting value and the first main gamma voltage VGMP to the display driver chip 1.

[0072] For example, such as Figure 5As shown, in this embodiment of the invention, the acquisition module 4 further includes a writing unit 47 and a gamma data acquisition unit 48. The writing unit 47 is used to write the first main gamma voltage VGMP and the register setting value to the display driver chip 1 after obtaining the first main gamma voltage VGMP and the register setting value, and before programming the register setting value and the first main gamma voltage VGMP to the display driver chip 1. The gamma data acquisition unit 48 is used to perform gamma adjustment on the display panel 2 after writing the first main gamma voltage VGMP and the register setting value to the display driver chip 1, so as to obtain multiple gamma data voltages corresponding to different gray levels. The aforementioned programming unit 46 is also used to program the gamma data voltages to the display driver chip 1.

[0073] For example, such as Figure 7 As shown, Figure 7 This is a schematic diagram of a gamma data acquisition unit provided in an embodiment of the present invention. The gamma data acquisition unit 48 includes a data voltage providing unit 481 and a gamma data confirmation unit 482. The data voltage providing unit 481 is used to provide data voltages corresponding to different gray levels to the display panel 2. The brightness acquisition unit 42 is also used to acquire the actual brightness of the display panel 2 at different gray levels. When the actual brightness of the display panel 2 reaches the target brightness corresponding to the gray level, the gamma data confirmation unit 482 is used to take the data voltage corresponding to the current gray level as the gamma data voltage.

[0074] This invention also provides a display device, such as... Figure 1 As shown, the display device includes a display panel 2 and a display driver chip 1. The display driver chip 1 receives the analog power supply voltage AVDD, which is obtained according to the above-described acquisition method. The display driver chip 1 is electrically connected to the display panel 2. For example, the display panel 2 can be an active-matrix display panel, such as an organic light-emitting diode (OLED) display panel. Alternatively, it can be a liquid crystal display (LCD) panel.

[0075] certainly, Figure 1 The display device shown is for illustrative purposes only. The display device can be any electronic device with display function, such as a mobile phone, tablet computer, laptop computer, e-reader or television.

[0076] The display device provided in this embodiment of the invention, when acquiring the analog power supply voltage AVDD, first acquires the first main gamma voltage VGMP. The first main gamma voltage VGMP matches the structure, material, or process characteristics of the display panel 2. Under the first main gamma voltage VGMP, the actual brightness of the display panel 2 is less than or equal to the target dark state brightness. Then, based on the first main gamma voltage VGMP, an analog power supply voltage AVDD that meets the requirements of the first main gamma voltage VGMP can be obtained, thus avoiding situations where the analog power supply voltage AVDD is too large or too small. When the display device is working, based on the setting method provided in this embodiment of the invention, on the one hand, it can avoid the problem that the display panel 2 cannot display the target dark state brightness due to setting the analog power supply voltage AVDD too small, which is beneficial to improving the display effect of the display panel 2; on the other hand, it can also avoid the problem that the power consumption of the display driver chip 1 is too large due to setting the analog power supply voltage AVDD too large, which is beneficial to reducing the power consumption of the display driver chip 1.

[0077] Furthermore, this embodiment of the invention provides a minimum grayscale test voltage VGMP0 to the display driver chip 1, collects the actual brightness of the display panel 2 under the minimum grayscale test voltage, and adjusts the minimum grayscale test voltage VGMP0 provided to the display driver chip 1 according to the actual brightness of the display panel 2. The minimum grayscale test voltage when the actual brightness of the display panel 2 is less than or equal to the target dark state brightness is taken as the first main gamma voltage VGMP. Through this dynamic adjustment process, the accuracy of the obtained first main gamma voltage VGMP can be improved, which is beneficial to further ensure the accuracy of the obtained analog power supply voltage AVDD.

[0078] For example, such as Figure 1 As shown, the display device also includes a power management chip (Power Integrated Circuit, or Power IC) 3 electrically connected to the display driver chip 1. The power management chip 3 provides an analog power supply voltage AVDD to the display driver chip 1 based on its needs. Optionally, when the display panel includes an OLED display panel, the power management chip 3 is also used to provide a first power supply voltage ELVDD and / or a second power supply voltage ELVSS to the light-emitting devices in the display panel 1.

[0079] For example, the display driver chip 1 includes a register storing register settings. The power management chip 3 provides the analog power supply voltage AVDD to the display driver chip 1 according to the register settings. For example, the display driver chip 1 can send pulse signals to the power management chip 3 according to the register settings. The number of pulses corresponds to the register settings, and the power management chip 3 determines the analog power supply voltage AVDD based on the number of pulses.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for obtaining analog power supply voltage, characterized in that, The analog power supply voltage is used to provide power to the display driver chip, which drives the display panel. The method for obtaining the voltage includes: Provide the minimum grayscale test voltage to the display driver chip, and collect the actual brightness of the display panel under the minimum grayscale test voltage; Based on the actual brightness of the display panel, the minimum grayscale test voltage is adjusted, and the minimum grayscale test voltage at which the actual brightness of the display panel reaches the target dark state brightness is taken as the first main gamma voltage. The analog power supply voltage is obtained based on the first main gamma voltage; The method for adjusting the minimum grayscale test voltage includes: Compare the actual brightness of the display panel with the target dark state brightness; When the actual brightness of the display panel is greater than the target dark state brightness, the minimum grayscale test voltage is increased by a first preset step size until the actual brightness of the display panel is less than or equal to the target dark state brightness; When the actual brightness of the display panel is less than or equal to the target dark state brightness, the minimum grayscale test voltage is reduced by a second preset step size until the actual brightness of the display panel is greater than the target dark state brightness; the step of using the minimum grayscale test voltage at which the actual brightness of the display panel reaches the target dark state brightness as the first main gamma voltage includes: using the minimum value of a plurality of minimum grayscale test voltages when the actual brightness of the display panel is less than or equal to the target dark state brightness as the first main gamma voltage.

2. The acquisition method according to claim 1, characterized in that, The value of the first main gamma voltage is V GMP The value of the simulated power supply voltage is V. AVDD , where V AVDD =V GMP +C, 0.3V≤C≤0.5V.

3. The acquisition method according to claim 1, characterized in that, Also includes: Based on the simulated power supply voltage, obtain the register setting value corresponding to the simulated power supply voltage; The register settings and the first master gamma voltage are programmed into the display driver chip.

4. The acquisition method according to claim 3, characterized in that, After obtaining the register setting value, before programming the register setting value and the first main gamma voltage to the display driver chip, the acquisition method further includes: Write the first main gamma voltage and the register setting value into the display driver chip; Perform gamma adjustment on the display panel to obtain gamma data voltage; The step of programming the register settings and the first master gamma voltage into the display driver chip includes: The gamma data voltage is programmed into the display driver chip.

5. The acquisition method according to claim 4, characterized in that, The method for performing gamma adjustment on the display panel to obtain the gamma data voltage includes: The display panel is provided with data voltages corresponding to different gray levels, and the actual brightness of the display panel at different gray levels is collected. When the actual brightness of the display panel reaches the target brightness corresponding to the gray level, the data voltage corresponding to the gray level is used as the gamma data voltage.

6. The acquisition method according to claim 4, characterized in that, After programming the register settings and the first main gamma voltage to the display driver chip, the process further includes: The display panel is lit up with the register setting value and the first main gamma voltage, the actual brightness of the display panel is collected, and the register setting value and the first main gamma voltage in the display driver chip are read back; Power off when the actual brightness is less than or equal to the target dark state brightness, and when the register setting value and the first main gamma voltage are correct.

7. A module for acquiring analog power supply voltage, characterized in that, The analog power supply voltage is used to provide power to the display driver chip, which drives the display panel. The acquisition module includes: A minimum grayscale test voltage providing unit is used to provide a minimum grayscale test voltage to the display driver chip; A brightness acquisition unit is used to acquire the actual brightness of the display panel under the minimum grayscale test voltage. The first main gamma voltage acquisition unit is used to take the minimum grayscale test voltage when the actual brightness of the display panel reaches the target dark state brightness as the first main gamma voltage. A simulated power supply voltage acquisition unit is used to obtain the simulated power supply voltage based on the first main gamma voltage; The minimum grayscale test voltage providing unit includes: The comparison unit is used to compare the actual brightness of the display panel with the target dark state brightness; The first adjustment unit is used to increase the minimum grayscale test voltage by a first preset step size when the actual brightness of the display panel is greater than the target dark state brightness, until the actual brightness of the display panel is less than or equal to the target dark state brightness; The second adjustment unit is used to reduce the minimum grayscale test voltage by a preset step size when the actual brightness of the display panel is less than or equal to the target dark state brightness, until the actual brightness of the display panel is greater than the target dark state brightness; the first main gamma voltage acquisition unit is used to take the minimum value of the plurality of minimum grayscale test voltages when the actual brightness of the display panel is less than or equal to the target dark state brightness as the first main gamma voltage.

8. The acquisition module according to claim 7, characterized in that, Also includes: The register setting value acquisition unit is used to obtain the register setting value corresponding to the analog power supply voltage based on the analog power supply voltage. The programming unit is used to program the register settings and the first main gamma voltage into the display driver chip.

9. The acquisition module according to claim 8, characterized in that, Also includes: The writing unit is used to write the first main gamma voltage and the register setting value into the display driver chip after obtaining the first main gamma voltage and the register setting value, and before burning the register setting value and the first main gamma voltage into the display driver chip. The gamma data acquisition unit is used to perform gamma debugging on the display panel after writing the first main gamma voltage and the register setting value into the display driver chip, and obtain the gamma data voltage. The programming unit is also used to program the gamma data voltage into the display driver chip.

10. The acquisition module according to claim 9, characterized in that, The gamma data acquisition unit includes a data voltage supply unit and a gamma data confirmation unit. The data voltage supply unit is used to provide data voltages corresponding to different gray levels to the display panel. The brightness acquisition unit is also used to acquire the actual brightness of the display panel at different gray levels; When the actual brightness of the display panel reaches the target brightness corresponding to the grayscale, the gamma data confirmation unit is used to take the data voltage corresponding to the grayscale as the gamma data voltage.

11. A display device, characterized in that, The device includes a display panel and a display driver chip, wherein the display driver chip is used to receive an analog power supply voltage, which is obtained by the acquisition method according to any one of claims 1-6, and the display driver chip is electrically connected to the display panel.

12. The display device according to claim 11, characterized in that, It also includes a power management chip electrically connected to the display driver chip, the power management chip being used to provide the analog power supply voltage to the display driver chip.

13. The display device according to claim 12, characterized in that, The display driver chip includes a register, which stores the register setting value. The power management chip is used to provide the analog power supply voltage to the display driver chip according to the register setting value.

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