Display device and electronic device

Abstract

This application provides embodiments belonging to display technology, providing a display device and an electronic device. The display device includes: a backlight module, including light-emitting devices, wherein the light-emitting devices include at least a first light-emitting device and a second light-emitting device, and the first light-emitting device and the second light-emitting device emit light beams with different wavelengths; a control unit, electrically connected to the backlight module, configured to: drive the light-emitting devices to emit light according to a driving signal; wherein, when the light-emitting device changes from a first brightness to a second brightness, the change ratio of the driving signal for the first light-emitting device is different from the change ratio of the driving signal for the second light-emitting device, fully taking into account the differences in structure and materials of the first light-emitting device and the second light-emitting device, effectively avoiding the offset of the white field color coordinates, and improving the display effect.

Description

Technical Field

[0001] This application relates to display technology. More specifically, it relates to a display device and an electronic device. Background Technology

[0002] As users' living standards improve, their demands for display quality are also increasing. Peaking technology is one of the important methods to improve display quality, and currently, it is mostly used in traditional LCD and OLED displays.

[0003] In some related technologies, when Peaking technology is applied to display devices using RGB Mini-LEDs as backlights, the differences in the structure and materials of the Mini-LEDs emitting different RGB primary color backlights can easily cause the white field color coordinates to shift at different brightness levels when the brightness of different primary color backlights is increased, thus affecting the display effect. Summary of the Invention

[0004] This application provides a display device and an electronic device that can solve the problem in the related art where, when Peaking technology is applied to a display device using RGB Mini-LED as a backlight, the white field color coordinates shift at different brightness levels, affecting the display effect.

[0005] In a first aspect, embodiments of this application provide a display device, the display device comprising:

[0006] A backlight module includes light-emitting devices, wherein the light-emitting devices include at least a first light-emitting device and a second light-emitting device, and the first light-emitting device and the second light-emitting device emit light beams with different wavelengths;

[0007] The control unit, electrically connected to the backlight module, is configured to:

[0008] The light-emitting device is driven to emit light according to the driving signal;

[0009] Specifically, when the light-emitting device changes from a first brightness to a second brightness, the change ratio of the driving signal of the first light-emitting device is different from the change ratio of the driving signal of the second light-emitting device.

[0010] The display device provided in this embodiment takes into full account the differences in structure and materials of light-emitting devices that emit different light beams when the brightness of the light-emitting device changes from the first brightness to the second brightness. It changes the way in which the change ratio of the driving signal of the first light-emitting device is the same as that of the driving signal of the second light-emitting device. By controlling the change ratio of the driving signal of the first light-emitting device to be different from that of the second light-emitting device, the white point color coordinate fluctuates within a small range, which effectively avoids the offset of the white point color coordinate, which is beneficial to improving the display effect. At the same time, it also avoids the problem of brightness loss when adjusting the white balance.

[0011] In some embodiments of this application, the driving signal includes a pulse width modulation signal;

[0012] The control unit includes:

[0013] The image processing module is configured to: acquire the image to be displayed and determine the average brightness value corresponding to the image;

[0014] The backlight driver module is configured as follows:

[0015] Receive the average brightness value of the image sent by the image processing module;

[0016] Based on the average brightness value and the first average brightness set, the duty cycle of the pulse width modulation signal of the light-emitting device emitting different light beams is determined, and a corresponding pulse width modulation signal is generated based on the duty cycle of the pulse width modulation signal of the light-emitting device emitting different light beams, so as to drive the light-emitting device according to the pulse width modulation signal.

[0017] The first average brightness set includes the duty cycles of pulse width modulation signals corresponding to light-emitting devices emitting different light beams under different average brightness values. When the first average brightness value changes to the second average brightness value, the change ratio of the duty cycle of the pulse width modulation signal corresponding to the first light-emitting device is different from the change ratio of the duty cycle of the pulse width modulation signal corresponding to the second light-emitting device.

[0018] The display device provided in this embodiment controls the brightness of the light-emitting device by adjusting the duty cycle of the pulse width modulation signal. When displaying images corresponding to different average brightness values, the method changes the proportion of the duty cycle of the pulse width modulation signal of the first light-emitting device from the second light-emitting device when the average brightness value changes from the first average brightness value to the second average brightness value. By controlling the proportion of the duty cycle of the pulse width modulation signal of the first light-emitting device to be different from that of the second light-emitting device when the average brightness value changes from the first average brightness value to the second average brightness value, the white point color coordinate fluctuates within a small range, effectively avoiding the offset of the white point color coordinate and also avoiding the problem of brightness loss when adjusting the white balance, which is beneficial to improving the display effect.

[0019] In some embodiments of this application, the first average brightness set is determined by the following method:

[0020] Obtain the white field color coordinates and the subfield color coordinates corresponding to beams of different wavelengths;

[0021] Obtain multiple reference average brightness values ​​and the brightness corresponding to the multiple reference average brightness values;

[0022] Based on the white field color coordinates, the subfield color coordinates, and the brightness corresponding to the multiple reference average brightness values, the brightness of the light-emitting devices emitting different light beams under different reference average brightness values ​​is determined.

[0023] Based on the brightness of light-emitting devices emitting different light beams under different reference average brightness values, determine the duty cycle of the pulse width modulation signal corresponding to any average brightness value within the first preset range, for each light-emitting device emitting different light beams.

[0024] The plurality of reference average brightness values ​​are multiple average brightness values ​​located within the first preset range, and the brightness corresponding to the reference average brightness value is used to characterize the sum of the brightness of light-emitting devices emitting different light beams under the reference average brightness value.

[0025] The first average brightness set provided in this embodiment includes a pulse width modulation signal whose duty cycle corresponds to the light-emitting device emitting different light beams at any average brightness value. This duty cycle is determined based on a preset white field color coordinate. Therefore, when the display device displays images with different average brightness values, a corresponding pulse width modulation signal is generated according to the duty cycle of the pulse width modulation signal determined by the first average brightness set to drive the light-emitting device emitting different light beams. This results in smaller fluctuations in the white field color coordinate, effectively avoiding the offset of the white field color coordinate and improving the display effect.

[0026] In some embodiments of this application, the driving signal further includes current;

[0027] The backlight driving module is also configured to:

[0028] Based on the average brightness value and the first average brightness set, the current of the light-emitting device emitting different light beams is determined, so as to drive the light-emitting device according to the current of the light-emitting device emitting different light beams and the pulse width modulation signal.

[0029] The first average brightness set also includes the current of light-emitting devices emitting different light beams under different average brightness values, and when the first average brightness value changes to the second average brightness value, the change ratio of the current corresponding to the first light-emitting device is the same as or different from the change ratio of the current corresponding to the second light-emitting device.

[0030] In this embodiment, for a display device that controls the brightness of a light-emitting device using current and pulse width modulation signals, the first average brightness set also includes the current of the light-emitting device under different average brightness values, so as to achieve control of the light-emitting device based on the current and pulse width modulation signals. Specifically, when the first average brightness value changes to the second average brightness value, by controlling the change ratio of the current corresponding to the first light-emitting device to be the same as or different from the change ratio of the current of the second light-emitting device, the white point color coordinate fluctuates within a small range, effectively avoiding the offset of the white point color coordinate.

[0031] In some embodiments of this application, the current of the light-emitting devices emitting different light beams under different average brightness values ​​in the first set of average brightness is determined by the following method:

[0032] Based on the brightness corresponding to the light-emitting devices emitting different light beams under different reference average brightness values, determine the current corresponding to any average brightness value and the light-emitting devices emitting different light beams within the first preset range.

[0033] In this embodiment, based on the brightness of light-emitting devices emitting different light beams under different reference average brightness values, the current corresponding to any average brightness value within the first preset range and the light-emitting devices emitting different light beams can be obtained, which helps to reduce the amount of calculation and improve efficiency.

[0034] In some embodiments of this application, determining the current corresponding to any average brightness value and the light-emitting devices emitting different light beams within a first preset range based on the brightness corresponding to the light-emitting devices emitting different light beams under different reference average brightness values ​​includes:

[0035] For the light-emitting device that emits the target beam, turn off the light-emitting devices that emit other beams under the white chart. Based on the brightness of the light-emitting devices that emit different beams under different reference average brightness values, determine the current of the light-emitting device that emits the target beam under different reference average brightness values.

[0036] Interpolation processing is performed on the current of the light-emitting device emitting the target beam under different reference average brightness values ​​to determine the current of the light-emitting device emitting the target beam corresponding to any average brightness value within a first preset range.

[0037] In this embodiment, it is only necessary to calculate the current of the light-emitting device emitting different light beams under multiple reference average brightness values. The current of the light-emitting device emitting different light beams corresponding to any average brightness value within the first preset range can be obtained through interpolation. This helps to reduce the amount of calculation and improve efficiency.

[0038] In some embodiments of this application, obtaining multiple reference average brightness values ​​includes:

[0039] Multiple preset reference images are acquired. Each reference image includes a white window, and the size of the white window is different in different reference images.

[0040] Based on the size of the white window in the reference image and the number of pixels included in the display device, the reference average brightness value corresponding to the reference image is determined.

[0041] In this embodiment, the corresponding average brightness value is determined by white windows of different sizes in multiple reference images, which is simple and efficient.

[0042] In some embodiments of this application, under different reference average brightness values, the ratio of the brightness of the first light-emitting device to the brightness of the second light-emitting device satisfies a preset brightness ratio range.

[0043] The brightness ratio range is determined by the color temperature of the display device. Under different color temperatures, the brightness ratio ranges corresponding to the first light-emitting device and the second light-emitting device are different.

[0044] In this embodiment, based on a preset brightness ratio range, it is beneficial to improve the accuracy of the brightness ratio of light-emitting devices emitting different light beams under different reference average brightness values.

[0045] In some embodiments of this application, the driving signal further includes current;

[0046] The backlight driving module is also configured to:

[0047] The current of light-emitting devices emitting different light beams is obtained from a preset data source, and the light-emitting devices are driven according to the current and the pulse width modulation signal.

[0048] Among them, for any two average brightness values, the current of the light-emitting devices emitting different light beams is the same.

[0049] In this embodiment, for a display device that controls brightness by adjusting the duty cycle of a pulse width modulation signal with a fixed current, the current of the light-emitting devices emitting different light beams is the same for any two average brightness values. This is preset in the display device, and a preset current can be obtained to drive the light-emitting devices.

[0050] In a second aspect, embodiments of this application provide an electronic device configured to test a display device provided in any of the first aspects, wherein the display device is used to display multiple images and includes a backlight module, the backlight module including light-emitting devices, the light-emitting devices including at least a first light-emitting device and a second light-emitting device, the first light-emitting device and the second light-emitting device emitting light beams having different wavelengths;

[0051] The electronic device is specifically configured as follows:

[0052] For any image displayed by the display device, determine the brightness, white field color coordinates of the image, and the driving signals corresponding to the light-emitting devices that emit different light beams when displaying the image;

[0053] The brightness of different images is different, and the white field color coordinates of different images are within a second preset range. When the display device changes from displaying the first image to displaying the second image, the change ratio of the driving signal of the first light-emitting device is different from the change ratio of the driving signal of the second light-emitting device.

[0054] The electronic device provided in this embodiment can test a display device. When the display device displays multiple images, by acquiring the brightness, white point color coordinates, and driving signals corresponding to the light-emitting devices emitting different light beams for each image, it can be seen that when the display device changes from displaying the first image to displaying the second image, by controlling the change ratio of the driving signal of the first light-emitting device to be different from that of the driving signal of the second light-emitting device, the white point color coordinates of the different images can be kept within a second preset range, that is, fluctuating within a small range. This effectively avoids the problem of white point color coordinate offset, thereby improving the display effect of the display device. Attached Figure Description

[0055] To more clearly illustrate the implementation methods in the embodiments of this application or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0056] Figure 1 This is a schematic diagram of a Peaking curve;

[0057] Figure 2 A schematic diagram illustrating the principle of a display device displaying a screen, provided in an embodiment of this application;

[0058] Figure 3 A schematic diagram of the structure of a display device provided in this application embodiment. Figure 1 ;

[0059] Figure 4 A schematic diagram of the structure of a display device provided in this application embodiment. Figure 2 ;

[0060] Figure 5 A schematic diagram of the structure of a display device provided in this application embodiment. Figure 3 ;

[0061] Figure 6 A flowchart illustrating a method for determining a first average brightness set, provided in an embodiment of this application;

[0062] Figure 7 A flowchart illustrating a method for obtaining a reference average brightness value, provided in an embodiment of this application;

[0063] Figure 8 A schematic diagram of the brightness ratio curve of a light-emitting device emitting RGB three-color backlight at different color temperatures, provided for an embodiment of this application;

[0064] Figure 9 A flowchart illustrating a method for determining the current of a light-emitting device emitting a target beam at any average brightness value, provided in an embodiment of this application;

[0065] Figure 10 This is a schematic diagram of a testing device provided in an embodiment of this application. Detailed Implementation

[0066] To make the objectives, implementation methods and advantages of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only some embodiments of this application, and not all embodiments.

[0067] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0068] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclusively include, for example, a product or device that includes a series of components is not necessarily limited to those that are explicitly listed, but may include other components that are not explicitly listed or that are inherent to such product or device.

[0069] Peaking technology can effectively improve display brightness, enhance contrast, and improve display quality. Its basic principle is as follows: Figure 1 As shown, Figure 1 This is a schematic diagram of a Peaking curve, where the horizontal axis represents the backlight APL (Average Picture Level) value, and the vertical axis represents the brightness, with the unit being nits.

[0070] Currently, peaking technology is mostly used in traditional LCD displays, where it can be achieved simply by adjusting the brightness of the monochrome backlight. Besides traditional LCD displays, peaking can also be used in OLED displays.

[0071] When Peaking technology is applied to display devices that use RGB Mini-LEDs as backlights, the brightness of the RGB Mini-LEDs is not increased proportionally when the duty cycle of the same pulse width modulation signal is increased for the same RGB Mini-LEDs due to differences in the structure and materials of the Mini-LEDs that emit different RGB primary color backlights. This results in a shift in the white field color coordinates and affects the display effect.

[0072] When Peaking technology is applied to display devices that use RGB Mini-LEDs as backlights, in order to avoid the white field color coordinates shifting under different brightness levels, the brightness ratio of the three colors of the RGB Mini-LED backlight needs to be adjusted to achieve overall brightness regulation.

[0073] Based on this, this application provides a display device and an electronic device, wherein the display device includes a backlight module and a control unit. The backlight module includes light-emitting devices, at least a first light-emitting device and a second light-emitting device, wherein the wavelengths of the light beams emitted by the first and second light-emitting devices are different. The control unit can drive the light-emitting devices to emit light according to a driving signal. When the brightness of the light-emitting devices changes from a first brightness to a second brightness, by controlling the change ratio of the driving signal for the first light-emitting device to be different from that for the second light-emitting device, the differences in structure and materials of the light-emitting devices emitting different light beams are fully considered, ensuring that the white point color coordinates fluctuate within a small range, effectively avoiding white point color coordinate shifts and improving display performance. Simultaneously, this application achieves white point color coordinate correction by adjusting the backlight, avoiding power loss caused by white point color coordinate correction and solving the problem of brightness loss when adjusting white balance.

[0074] Figure 2 This is a schematic diagram illustrating the principle of a display device displaying an image, provided in an embodiment of this application. (Refer to...) Figure 2 As shown, the display device includes an image processing module, a backlight driving module, and a liquid crystal display module.

[0075] The image processing module includes a frame rate conversion chip, which receives image data, processes it accordingly, and performs grayscale partitioning statistics based on the processed image data to obtain grayscale distribution information. Grayscale compensation is then performed on the image data according to the backlight optical model and the grayscale distribution information, and the compensated image data is sent to the timing controller. The timing controller then drives the display screen for display.

[0076] At the same time, the frame rate conversion chip also sends grayscale distribution information to the main control chip. After processing the grayscale distribution information, the main control chip obtains backlight data and drives the LED driver chip based on the backlight data, so that the LED driver chip controls the backlight.

[0077] The display device provided in this application can have various implementation forms, such as a television, a smart television, a monitor, an electronic bulletin board, an electronic table, etc.

[0078] The technical solution of this application will be described in detail below with reference to specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0079] Figure 3 A schematic diagram of the structure of a display device provided in this application embodiment. Figure 1,refer to Figure 3 As shown, the display device includes:

[0080] The backlight module 31 includes light-emitting devices, which include at least a first light-emitting device and a second light-emitting device, wherein the wavelengths of the light beams emitted by the first light-emitting device and the second light-emitting device are different.

[0081] Control unit 32, electrically connected to backlight module 31, is configured as follows:

[0082] The light-emitting device is driven to emit light according to the driving signal;

[0083] Specifically, when the light-emitting device changes from a first brightness to a second brightness, the change ratio of the driving signal of the first light-emitting device is different from the change ratio of the driving signal of the second light-emitting device.

[0084] In one implementation scenario, the display device may include a display screen, and the light-emitting devices in the backlight module 31 emit light beams to provide backlight for the display screen. The display screen may be a liquid crystal display (LCD).

[0085] In one implementation scenario, the light beam emitted by the light-emitting device may include light beams of three colors: red (R), green (G), and blue (B), or light beams of other colors, with different colors corresponding to different wavelengths. The light-emitting device emitting the light beam may be a Mini-LED or other light-emitting devices. This application does not limit the type of light-emitting device or the wavelength and color of the emitted light beam.

[0086] In some embodiments, the drive signal used by the control unit 32 to control the light emission of the light-emitting device may include a pulse width modulation (PWM) signal and current. The brightness of the light-emitting device is controlled by adjusting the duty cycle of the PWM signal and / or the magnitude of the current.

[0087] The duty cycle of the pulse width modulation (PWM) signal controls the emission duration of the light-emitting device. A larger PWM duty cycle results in a longer emission duration and higher brightness. Conversely, a smaller PWM duty cycle results in a shorter emission duration and lower brightness. Similarly, a larger current leads to higher brightness, and a smaller current results in lower brightness.

[0088] In one implementation scenario, the display device achieves changes in the brightness of the light-emitting device simply by altering the duty cycle of the pulse width modulation signal. In this case, the current is a fixed value. When the light-emitting device changes from a first brightness to a second brightness, the change ratio of the duty cycle of the pulse width modulation signal for the first light-emitting device can be controlled to be different from that for the second light-emitting device. This fully considers the differences in structure and materials between the first and second light-emitting devices, allowing the white point color coordinates to fluctuate within a small range. This effectively avoids the offset of the white point color coordinates and helps improve the display effect.

[0089] In another implementation scenario, the display device controls the brightness of the light-emitting device simply by changing the magnitude of the current. When the light-emitting device changes from a first brightness to a second brightness, the change ratio of the current of the first light-emitting device can be controlled to be different from the change ratio of the current of the second light-emitting device to avoid the offset of the white field color coordinates.

[0090] In another implementation scenario, when the display device controls the brightness of the light-emitting device through pulse width modulation signal and current, when the light-emitting device changes from a first brightness to a second brightness, the change ratio of the duty cycle of the pulse width modulation signal of the first light-emitting device can be controlled to be different from the change ratio of the duty cycle of the pulse width modulation signal of the second light-emitting device. The change ratio of the current of the first light-emitting device and the change ratio of the current of the second light-emitting device can be the same or different, so as to avoid the offset of the white field color coordinates.

[0091] This application provides a display device including a backlight module 31 and a control unit 32. The backlight module 31 includes light-emitting devices, at least a first light-emitting device and a second light-emitting device, and the wavelengths of the light beams emitted by the first and second light-emitting devices are different. The control unit 32 is electrically connected to the backlight module 31 and can drive the light-emitting devices to emit light according to a driving signal. When the brightness of the light-emitting devices changes from a first brightness to a second brightness, the change ratio of the driving signal for the first light-emitting device is different from that for the second light-emitting device. This fully considers the differences in materials and structures between the first and second light-emitting devices, ensuring that the white point color coordinates fluctuate within a small range during brightness changes, maintaining relative stability, thereby improving the display effect. Furthermore, this application achieves white point color coordinate correction by adjusting the brightness of the light-emitting devices, avoiding power loss caused by white point color coordinate correction and solving the problem of brightness loss when adjusting white balance.

[0092] Figure 4 A schematic diagram of the structure of a display device provided in this application embodiment. Figure 2 ,refer to Figure 4 As shown, in one or more embodiments of this application, for a display device that controls the brightness of a light-emitting device solely by controlling the duty cycle of a pulse width modulation signal, the driving signal includes a pulse width modulation signal;

[0093] The control unit 32 includes:

[0094] The image processing module 321 is configured to: acquire the image to be displayed and determine the average brightness value corresponding to the image;

[0095] Backlight driver module 322 is configured as follows:

[0096] Receive the average brightness value of the image sent by the image processing module 321;

[0097] Based on the average brightness value and the first average brightness set, the duty cycle of the pulse width modulation signal of the light-emitting device emitting different light beams is determined, and a corresponding pulse width modulation signal is generated based on the duty cycle of the pulse width modulation signal of the light-emitting device emitting different light beams, so as to drive the light-emitting device according to the pulse width modulation signal.

[0098] The first average brightness set includes the duty cycles of pulse width modulation signals corresponding to light-emitting devices emitting different light beams under different average brightness values. When the first average brightness value changes to the second average brightness value, the change ratio of the duty cycle of the pulse width modulation signal corresponding to the first light-emitting device is different from the change ratio of the duty cycle of the pulse width modulation signal corresponding to the second light-emitting device.

[0099] Average luminance (APL) is used to characterize the average brightness of an image. In one implementation scenario, the average luminance can be represented by the size of a white image against a black background. For example, if the white image occupies one-quarter of the entire display screen, the APL is 25%; similarly, if the white image occupies half of the entire display screen, the APL is 50%; and if the white image occupies the entire display screen, the APL is 100%. The white image against a black background can also be referred to as a white window.

[0100] In one implementation scenario, when determining the average brightness value of the image, it can be determined based on the grayscale values ​​of multiple pixels included in the image.

[0101] In one implementation scenario, the drive signal further includes current;

[0102] The backlight driving module 322 is further configured to: acquire the current of a preset light-emitting device emitting different light beams, so as to drive the light-emitting device according to the current and the pulse width modulation signal;

[0103] Among them, for any two average brightness values, the current of the light-emitting devices emitting different light beams is the same. That is, under different average brightness values, the current of the light-emitting devices emitting different light beams is a fixed value, which can be preset in the display device.

[0104] Since the first average brightness set includes the duty cycles of pulse width modulation (PWM) signals corresponding to light-emitting devices emitting different light beams under different average brightness values, after determining the average brightness value of the image, the duty cycles of PWM signals corresponding to light-emitting devices emitting different light beams corresponding to the average brightness value of the image can be determined from the first average brightness set. Based on the determined duty cycles of the PWM signals, corresponding PWM signals are generated to drive the corresponding light-emitting devices and control them to emit light.

[0105] Because in the first average brightness set, when the first average brightness value changes to the second average brightness value, the change ratio of the duty cycle of the pulse width modulation signal corresponding to the first light-emitting device is different from that of the pulse width modulation signal corresponding to the second light-emitting device. That is, the brightness ratio of different beams is different. The differences in structure and materials of light-emitting devices that emit different beams are fully considered, and the white field color coordinates can be relatively stable under different average brightness values, that is, fluctuating within a small range.

[0106] Taking a light-emitting device that emits RGB light beams as an example, when the first average brightness value changes to the second average brightness value, specifically, when APL changes from 20% to 50%, at least two of the light-emitting devices that emit RGB light beams have different duty cycle changes. For example, the duty cycle change of the pulse width modulation signal of the light-emitting device emitting R light is 10%, and the change of the pulse width modulation signal of the light-emitting device emitting G light is 20%, etc.

[0107] Figure 5 A schematic diagram of the structure of a display device provided in this application embodiment. Figure 3 ,refer to Figure 5 As shown, in one implementation scenario, the control unit 32 may further include a panel driving module 323. The panel driving module 323 is connected to both the image processing module 321 and the display screen 33. The image processing module 321 performs grayscale compensation on the image data of the screen and sends the compensated image data to the panel driving module 323. The panel driving module 323 then drives the display screen 33 according to the compensated image data to achieve screen display. The panel driving module 323 may include the aforementioned... Figure 2 The timing controller shown.

[0108] This application embodiment provides a display device. After the image processing module 321 acquires the image to be displayed, it can determine the average brightness value of the image and send the average brightness value to the backlight driving module 322. The backlight driving module 322 can determine the duty cycle of the pulse width modulation signal of the light-emitting device emitting different light beams according to the average brightness value and a first average brightness set, so as to generate the corresponding pulse width modulation signal, and drive the light-emitting device emitting different light beams according to the pulse width modulation signal, so that the light-emitting device emits backlight, thereby realizing the image display. The first average brightness set includes the duty cycle of the pulse width modulation signal corresponding to the light-emitting device emitting different light beams under different average brightness values. When the first average brightness value changes to the second average brightness value, the change ratio of the duty cycle of the pulse width modulation signal corresponding to the first light-emitting device is different from the change ratio of the duty cycle of the pulse width modulation signal corresponding to the second light-emitting device. This application improves brightness based on Peaking technology, but changes the previous method of controlling the change ratio of the duty cycle of the pulse width modulation signal of the first light-emitting device to be the same as that of the second light-emitting device when the first average brightness value changes to the second average brightness value. By controlling the change ratio of the duty cycle of the pulse width modulation signal of the first light-emitting device to be different from that of the second light-emitting device when the first average brightness value changes to the second average brightness value, the differences in the structure and materials of the light-emitting devices emitting different light beams are fully considered. This makes the white point color coordinate fluctuate within a small range, effectively avoiding the offset of the white point color coordinate, which is beneficial to improving the display effect, and also avoids the problem of brightness loss when adjusting white balance.

[0109] Figure 6 This is a flowchart illustrating a method for determining a first average brightness set, provided as an embodiment of this application. This method can be executed by the control unit 32 of a display device. (See reference...) Figure 6 As shown, in one or more embodiments of this application, the first average brightness set is determined by the following method:

[0110] S601: Obtain the white field color coordinates and the subfield color coordinates corresponding to beams of different wavelengths.

[0111] In one implementation scenario, the white field color coordinates and the subfield color coordinates corresponding to beams of different wavelengths are all preset values.

[0112] In one implementation scenario, when the display device of this application modulates the brightness by changing the duty cycle of the pulse width modulation signal without changing the current of the light-emitting device, since the current is a fixed current, the subfield color coordinates corresponding to beams of different wavelengths remain unchanged.

[0113] In another implementation scenario, when the display device of this application controls the brightness of the light-emitting device by changing the current of the light-emitting device and the duty cycle of the pulse width modulation signal, the corresponding subfield color coordinates will usually change to a certain extent due to the change in the current of the light-emitting device. Therefore, when obtaining the subfield color coordinates corresponding to different wavelength beams, the current of the light-emitting device that emits different beams can be obtained, and the subfield color coordinates corresponding to the beam emitted by the light-emitting device can be determined based on the current.

[0114] In this context, for any light-emitting device that emits any type of light beam, the correlation between its different currents and the corresponding subfield color coordinates can also be preset in the display device, so as to determine the subfield color coordinates corresponding to the light beam under the current of the current light-emitting device based on the correlation.

[0115] S602: Obtain multiple reference average brightness values ​​and the brightness corresponding to the multiple reference average brightness values.

[0116] The plurality of reference average brightness values ​​are multiple average brightness values ​​located within the first preset range, and the brightness corresponding to the reference average brightness value is used to characterize the sum of the brightness of light-emitting devices emitting different light beams under the reference average brightness value.

[0117] In one implementation scenario, the first preset range is typically [0, 255], such as... Figure 1 The range corresponding to the horizontal axis shown. Still using... Figure 1 For example, the baseline average brightness value is Figure 1 The horizontal axis represents multiple values ​​in the average brightness value, with the baseline average brightness value corresponding to the brightness. Figure 1 The brightness represented by the vertical axis is used to characterize the sum of the brightness of light-emitting devices emitting different light beams under a certain reference average brightness value. It can also be called the white field brightness under the reference average brightness value. This brightness is a preset value and can be set according to actual needs.

[0118] Figure 7 A flowchart of a method for obtaining a reference average brightness value is provided in an embodiment of this application, with reference to... Figure 7 As shown, in one implementation scenario, obtaining multiple reference average brightness values ​​includes:

[0119] S701: Acquire multiple preset reference images, wherein the reference images include a white window, and the size of the white window is different in different reference images.

[0120] S702: Determine the reference average brightness value corresponding to the reference image based on the size of the white window in the reference image and the number of pixels included in the display device.

[0121] In one implementation scenario, the reference image is entirely black except for the white window. The display device has multiple preset reference images and corresponding brightness levels for each reference image.

[0122] In one implementation scenario, since the brightness value corresponding to white is 255, the product of the size of the white window (i.e., the number of pixels it occupies) and 255 is calculated. The ratio of this product to the number of pixels included in the display device is the reference average brightness value.

[0123] Taking any reference image as an example, if the display device has 1000 pixels, the white window occupies 100 pixels, and its brightness is 255, then the reference average brightness value for the reference image is (255*100) / 1000 = 25.5. Once the reference average brightness value is determined, the brightness of the reference image is the brightness corresponding to that value, which can be understood as the center brightness of the white window.

[0124] The above method determines the baseline average brightness value based on the size of the white window. In another implementation scenario, the baseline average brightness value can also be represented by the grayscale value of a grayscale image, i.e., the baseline image is a grayscale image, such as a grayscale image with a grayscale value of 25.5. In this case, the baseline average brightness value is 25.5. Different baseline images correspond to different grayscale values.

[0125] The reference average luminance value can also be characterized in other ways, and this application does not limit this.

[0126] In another implementation scenario, the baseline average brightness value and the brightness corresponding to the baseline average value can both be preset values, in which case there is no need to calculate the baseline average brightness value.

[0127] S603: Based on the white field color coordinates, the subfield color coordinates, and the brightness corresponding to the multiple reference average brightness values, determine the brightness of the light-emitting devices emitting different light beams under different reference average brightness values.

[0128] Taking the backlight module 31, where the light-emitting device includes RGB Mini-LEDs and emits RGB three-color backlight as an example, in one implementation scenario, based on the white field color coordinates, sub-field color coordinates, and the brightness corresponding to multiple reference average brightness values, the brightness of the light-emitting devices emitting different beams under different reference average brightness values ​​can be determined using the following formula:

[0129]

[0130] in, (x r y r ), (xg y g ), (x b y b ), (x w y w ) represent the subfield color coordinates of the RGB beams and the white field color coordinates, respectively; Y r Y g Y b Y represents the brightness of a light-emitting device emitting RGB light beams at a given reference average brightness value; w The white field brightness represents the sum of the brightness of the three RGB beams under a certain reference average brightness value. This white field brightness is the brightness corresponding to the reference average brightness value.

[0131] In some embodiments, under different reference average brightness values, the ratio of the brightness of the first light-emitting device to the brightness of the second light-emitting device satisfies a preset brightness ratio range.

[0132] The brightness ratio range is determined by the color temperature of the display device. Under different color temperatures, the brightness ratio ranges corresponding to the first light-emitting device and the second light-emitting device are different.

[0133] Figure 8 This application provides a schematic diagram of the brightness ratio curves of a light-emitting device emitting RGB three-color backlight at different color temperatures, as shown in the embodiments of this application. Figure 8 It can be seen that the light-emitting device emitting green backlight needs to provide most of the brightness, therefore its curve trend is basically consistent with the white point brightness. According to the curve trend, the light-emitting device emitting blue backlight provides less brightness, mainly used to adjust the white point color coordinates. It should be noted that... Figure 8 In the diagram, the brightness curves corresponding to green backlighting basically overlap under different color temperatures.

[0134] The brightness ratio range of the light-emitting devices emitting RGB three-color backlights at different color temperatures is shown in Table 1 below, as detailed below:

[0135] Table 1. Brightness ratio range of light-emitting devices emitting RGB three-color backlight at different color temperatures.

[0136] R:B (error) G:B (error) 6500K 5.4:1(±1.7) 14.3:1(±2.8) 8000K 4.3:1(±1.2) 11.7:1(±2.3) 10000K 3.5:1(±1.0) 10.2:1(±2.0) 12000K 2.9:1(±1.0) 8.8:1(±1.8)

[0137] In one implementation scenario, the color temperature of the display device can be adjusted by the user. When the color temperature of the display device is fixed, the ratio of the brightness of light-emitting devices emitting different light beams at different reference average brightness values ​​satisfies the range of brightness ratios of light-emitting devices emitting different light beams at that color temperature.

[0138] S604: Based on the brightness corresponding to the light-emitting devices emitting different light beams under different reference average brightness values, determine the duty cycle of the pulse width modulation signal corresponding to the light-emitting devices emitting different light beams for any average brightness value within a first preset range.

[0139] In one implementation scenario, for any given reference average brightness value, the duty cycle of the corresponding pulse width modulation signal can be obtained based on the brightness of the light-emitting devices emitting different beams. Then, the duty cycle of the pulse width modulation signal of the light-emitting devices emitting different beams under different reference average brightness values ​​is interpolated to obtain the duty cycle of the pulse width modulation signal corresponding to the light-emitting devices emitting different beams for any average brightness value within a first preset range. This helps to reduce the amount of calculation and improve the efficiency of determining the first average brightness set.

[0140] It should be noted that, in addition to the reference average brightness value, for any average brightness value within the first preset range, the ratio of brightness of light-emitting devices emitting different light beams also satisfies the range of brightness ratios of light-emitting devices emitting different light beams under the color temperature of the current display device.

[0141] In summary, when determining the first average brightness set, since the duty cycle of the pulse width modulation signal corresponding to the light-emitting device emitting different beams for any average brightness value is determined based on the preset white field color coordinates, when displaying images with different average brightness values, the corresponding pulse width modulation signal is generated according to the duty cycle of the pulse width modulation signal determined by the first average brightness set to drive the light-emitting device emitting different beams. This results in smaller fluctuations in the white field color coordinates when displaying different images, thus effectively avoiding the problem of white field color coordinate offset and improving the display effect.

[0142] In one or more embodiments of this application, when the display device controls the brightness of the light-emitting device by changing the current of the light-emitting device and the duty cycle of the pulse width modulation signal, the driving signal further includes the current.

[0143] The backlight driving module 322 is further configured to:

[0144] Based on the average brightness value and the first average brightness set, the current of the light-emitting device emitting different light beams is determined, so as to drive the light-emitting device according to the current of the light-emitting device emitting different light beams and the pulse width modulation signal.

[0145] The first average brightness set also includes the current of light-emitting devices emitting different light beams under different average brightness values, and when the first average brightness value changes to the second average brightness value, the change ratio of the current corresponding to the first light-emitting device is the same as or different from the change ratio of the current corresponding to the second light-emitting device.

[0146] Since the first average brightness set also includes the current of light-emitting devices emitting different light beams under different average brightness values, for the image to be displayed, after determining the corresponding average brightness value, the current emitting different light beams can be determined according to the first average brightness set. Combined with the pulse width modulation signal corresponding to the light-emitting devices emitting different light beams determined in the above embodiment, the control of the light-emitting devices can be realized.

[0147] In one implementation scenario, within the first set of average brightness values, the current of the light-emitting devices emitting different light beams at different average brightness values ​​is determined by the following method:

[0148] Based on the brightness corresponding to the light-emitting devices emitting different light beams under different reference average brightness values, determine the current corresponding to any average brightness value and the light-emitting devices emitting different light beams within the first preset range.

[0149] The brightness of light-emitting devices emitting different light beams under different reference average brightness values ​​is determined based on the white field color coordinates, subfield color coordinates, and the brightness corresponding to multiple reference average brightness values. The specific process can be referred to in the above embodiments, and will not be described in detail here.

[0150] Figure 9 A flowchart illustrating a method for determining the current of a light-emitting device emitting a target beam at any average brightness value, as provided in this application embodiment, is shown below. Figure 9 As shown, in one implementation scenario, based on the brightness corresponding to the light-emitting devices emitting different light beams under different reference average brightness values, the current corresponding to any average brightness value within a first preset range and the current corresponding to the light-emitting devices emitting different light beams are determined, including:

[0151] S901: For the light-emitting device that emits the target beam, turn off the light-emitting devices that emit other beams under the white chart. Based on the brightness of the light-emitting devices that emit different beams under different reference average brightness values, determine the current of the light-emitting device that emits the target beam under different reference average brightness values.

[0152] S902: For the different reference average brightness values, the current of the light-emitting device emitting the target beam is interpolated to determine the current of the light-emitting device emitting the target beam corresponding to any average brightness value within a first preset range.

[0153] The target beam is any one of the various beams that the light-emitting device of the display device can emit.

[0154] Taking the backlight module 31, where the light-emitting device is an RGB Mini-LED, the current of the light-emitting device emitting the target beam is illustrated using an example to determine the target beam under different reference average brightness values. When the target beam is a blue backlight, the R Mini-LED and G Mini-LED can be turned off while the display device is showing a white graphic. At this time, the current of the B Mini-LED under different reference average brightness values ​​can be determined.

[0155] Similarly, when the target beam is green backlight, and the R Mini-LED and B Mini-LED are turned off while the display device shows a white graphic, the current corresponding to the G Mini-LED under different reference average brightness values ​​can be determined.

[0156] Similarly, when the target beam is red backlight, and the G Mini-LED and B Mini-LED are turned off while the display device shows a white graphic, the current corresponding to the R Mini-LED under different primary color average brightness values ​​can be determined.

[0157] In one implementation scenario, based on the brightness corresponding to the light-emitting devices emitting different light beams under different reference average brightness values, when determining the current of the light-emitting device emitting the target light beam under different reference average brightness values, taking any reference average brightness value as an example, by adjusting the magnitude of the current of the light-emitting device emitting the target light beam and the duty cycle of the pulse width modulation signal, the magnitude of the current and the duty cycle of the pulse width modulation signal can be determined when the brightness of the target light beam emitted by the light-emitting device reaches the required brightness.

[0158] Since this application only needs to calculate the current corresponding to the light-emitting devices emitting different beams under multiple reference average brightness values ​​when determining the first average brightness set, the current corresponding to the light-emitting devices emitting different beams under any average brightness value within the first preset range can be obtained through interpolation, which helps to reduce the amount of calculation and improve efficiency.

[0159] In one implementation scenario, if the display device has a preset brightness value of 255 corresponding to the full white field brightness, the full white field brightness can be directly obtained. Based on the above formula (1), the current corresponding to the light-emitting devices that emit different beams at this time can be determined according to the full white field brightness, white field color coordinates and sub-field color coordinates. This current can also be called the full white field current.

[0160] In summary, when a display device controls the brightness of a light-emitting device by changing the current of the light-emitting device and the duty cycle of the pulse width modulation signal, the first average brightness set includes not only the duty cycle of the pulse width modulation signal of the light-emitting device emitting different light beams under different average brightness values, but also the current of the light-emitting device emitting different light beams under different average brightness values. Then, based on the first average brightness set, the current and duty cycle of the light-emitting device emitting different light beams corresponding to the average brightness value of the image to be displayed are determined, and the control of the light-emitting device is realized based on the current and the generated pulse width modulation signal.

[0161] In one or more embodiments of this application, an electronic device is provided, the electronic device being configured to test a display device provided in the above embodiments, wherein the display device is used to display multiple images, including a backlight module 31, the backlight module 31 including light-emitting devices, the light-emitting devices including at least a first light-emitting device and a second light-emitting device, the first light-emitting device and the second light-emitting device emitting light beams having different wavelengths;

[0162] The electronic device is specifically configured as follows:

[0163] For any image displayed by the display device, determine the brightness, white field color coordinates of the image, and the driving signals corresponding to the light-emitting devices that emit different light beams when displaying the image;

[0164] The brightness of different images is different, and the white field color coordinates of different images are within a second preset range. When the display device changes from displaying the first image to displaying the second image, the change ratio of the driving signal of the first light-emitting device is different from the change ratio of the driving signal of the second light-emitting device.

[0165] In some embodiments, the driving signal may include a pulse width modulation signal and / or current corresponding to the light-emitting device.

[0166] Taking the backlight module 31 as an example, the light-emitting devices include light-emitting devices that emit three types of light beams: RGB. When the display device changes from displaying the first screen to displaying the second screen, at least two of the light-emitting devices that emit three types of light beams have different duty cycle changes in their pulse width modulation signals.

[0167] In some embodiments, the electronic device is further configured to:

[0168] For any image displayed by the display device, obtain the current corresponding to the light-emitting devices that emit different light beams when displaying the image;

[0169] When the display device changes from displaying the first screen to displaying the second screen, the change ratio of the current corresponding to the first light-emitting device may be the same as or different from the change ratio of the current corresponding to the second light-emitting device.

[0170] In one implementation scenario, if the display device controls the brightness of the light-emitting device only by adjusting the duty cycle of the pulse width modulation signal, then for any two images, the light-emitting devices emitting different beams will have the same current.

[0171] It should be noted that, due to interference, for any two images, the current of the light-emitting devices that emit different beams may fluctuate within a small range.

[0172] In another implementation scenario, if the display device controls the brightness of the light-emitting device by changing the magnitude of the current and the duty cycle of the pulse width modulation signal, when the display device changes from displaying the first image to displaying the second image, the change ratio of the current corresponding to the first light-emitting device may be the same as or different from the change ratio of the current corresponding to the second light-emitting device.

[0173] Taking the backlight module 31 as an example, the light-emitting devices include light-emitting devices that emit three types of light beams: RGB. When the display device changes from displaying the first screen to displaying the second screen, the current change ratio of the light-emitting devices emitting the three types of light beams is the same, or at least the current change ratio of the two light-emitting devices is different.

[0174] The electronic device provided in this embodiment can test a display device. When the display device displays multiple images, by acquiring the brightness, white point color coordinates, and driving signals corresponding to the light-emitting devices emitting different light beams for different images, it can be seen that when changing from displaying the first image to displaying the second image, by controlling the change ratio of the driving signal of the first light-emitting device to be different from that of the driving signal of the second light-emitting device, the white point color coordinates of different images can fluctuate within a small range, effectively avoiding the problem of white point color coordinate offset, thereby improving the display effect of the display device.

[0175] Figure 10 This is a schematic diagram of a testing device provided in an embodiment of this application. The electronic device is configured to test the display device provided in the above embodiment. The display device is used to display multiple images and includes a backlight module 31. The backlight module 31 includes light-emitting devices, and the light-emitting devices include at least a first light-emitting device and a second light-emitting device. The wavelengths of the light beams emitted by the first light-emitting device and the second light-emitting device are different. The testing device 1000 includes:

[0176] The determining module 1001 is used to determine the brightness, white field color coordinates of any image displayed by the display device, and the driving signals corresponding to the light-emitting devices that emit different light beams when displaying the image.

[0177] The brightness of different images is different, and the white field color coordinates of different images are within a second preset range. When the display device changes from displaying the first image to displaying the second image, the change ratio of the driving signal of the first light-emitting device is different from the change ratio of the driving signal of the second light-emitting device.

[0178] The testing apparatus provided in this application embodiment can determine the brightness, white field color coordinates, and driving signals corresponding to light-emitting devices emitting different light beams on the display screen. Its implementation principle and technical effects are similar and will not be repeated here. It should be noted that the above... Figure 10 The division of modules shown is merely illustrative. This application does not limit the division of modules or the naming of modules.

[0179] This application also provides a computer-readable storage medium, which may include various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk. Specifically, the computer-readable storage medium stores program instructions, which are used in the methods described in the above embodiments.

[0180] This application also provides a program product including executable instructions stored in a readable storage medium. At least one control module of a display device can read the executable instructions from the readable storage medium, and the at least one control module executes the executable instructions to cause the display device to implement the methods provided in the various embodiments described above.

[0181] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0182] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. A display device, characterized in that, The display device includes: A backlight module includes light-emitting devices, wherein the light-emitting devices include at least a first light-emitting device and a second light-emitting device, and the first light-emitting device and the second light-emitting device emit light beams with different wavelengths; The control unit, electrically connected to the backlight module, is configured to: The light-emitting device is driven to emit light according to the driving signal; Specifically, when the light-emitting device changes from a first brightness to a second brightness, the change ratio of the driving signal of the first light-emitting device is different from the change ratio of the driving signal of the second light-emitting device.

2. The display device according to claim 1, characterized in that, The driving signal includes a pulse width modulation signal; The control unit includes: The image processing module is configured to: acquire the image to be displayed and determine the average brightness value corresponding to the image; The backlight driver module is configured as follows: Receive the average brightness value of the image sent by the image processing module; Based on the average brightness value and the first average brightness set, the duty cycle of the pulse width modulation signal of the light-emitting device emitting different light beams is determined, and a corresponding pulse width modulation signal is generated based on the duty cycle of the pulse width modulation signal of the light-emitting device emitting different light beams, so as to drive the light-emitting device according to the pulse width modulation signal. The first average brightness set includes the duty cycles of pulse width modulation signals corresponding to light-emitting devices emitting different light beams under different average brightness values. When the first average brightness value changes to the second average brightness value, the change ratio of the duty cycle of the pulse width modulation signal corresponding to the first light-emitting device is different from the change ratio of the duty cycle of the pulse width modulation signal corresponding to the second light-emitting device.

3. The display device according to claim 2, characterized in that, The first set of average brightness values ​​was determined by the following method: Obtain the white field color coordinates and the subfield color coordinates corresponding to beams of different wavelengths; Obtain multiple reference average brightness values ​​and the brightness corresponding to the multiple reference average brightness values; Based on the white field color coordinates, the subfield color coordinates, and the brightness corresponding to the multiple reference average brightness values, the brightness of the light-emitting devices emitting different light beams under different reference average brightness values ​​is determined. Based on the brightness of light-emitting devices emitting different light beams under different reference average brightness values, determine the duty cycle of the pulse width modulation signal corresponding to any average brightness value within the first preset range, for each light-emitting device emitting different light beams. The plurality of reference average brightness values ​​are multiple average brightness values ​​located within the first preset range, and the brightness corresponding to the reference average brightness value is used to characterize the sum of the brightness of light-emitting devices emitting different light beams under the reference average brightness value.

4. The display device according to claim 3, characterized in that, The driving signal also includes current; The backlight driving module is also configured to: Based on the average brightness value and the first average brightness set, the current of the light-emitting device emitting different light beams is determined, so as to drive the light-emitting device according to the current of the light-emitting device emitting different light beams and the pulse width modulation signal. The first average brightness set also includes the current of light-emitting devices emitting different light beams under different average brightness values, and when the first average brightness value changes to the second average brightness value, the change ratio of the current corresponding to the first light-emitting device is the same as or different from the change ratio of the current corresponding to the second light-emitting device.

5. The display device according to claim 4, characterized in that, In the first set of average brightness values, the current of the light-emitting devices emitting different light beams under different average brightness values ​​is determined by the following method: Based on the brightness corresponding to the light-emitting devices emitting different light beams under different reference average brightness values, determine the current corresponding to any average brightness value and the light-emitting devices emitting different light beams within the first preset range.

6. The display device according to claim 5, characterized in that, The step of determining the current corresponding to any average brightness value and the light-emitting devices emitting different light beams within a first preset range, based on the brightness corresponding to the light-emitting devices emitting different light beams under different reference average brightness values, includes: For the light-emitting device that emits the target beam, turn off the light-emitting devices that emit other beams under the white chart. Based on the brightness of the light-emitting devices that emit different beams under different reference average brightness values, determine the current of the light-emitting device that emits the target beam under different reference average brightness values. Interpolation processing is performed on the current of the light-emitting device emitting the target beam under different reference average brightness values ​​to determine the current of the light-emitting device emitting the target beam corresponding to any average brightness value within a first preset range.

7. The display device according to claim 3, characterized in that, The acquisition of multiple reference average brightness values ​​includes: Multiple preset reference images are acquired. Each reference image includes a white window, and the size of the white window is different in different reference images. Based on the size of the white window in the reference image and the number of pixels included in the display device, the reference average brightness value corresponding to the reference image is determined.

8. The display device according to claim 3, characterized in that, Under different baseline average brightness values, the ratio of the brightness of the first light-emitting device to the brightness of the second light-emitting device satisfies a preset brightness ratio range. The brightness ratio range is determined by the color temperature of the display device. Under different color temperatures, the brightness ratio ranges corresponding to the first light-emitting device and the second light-emitting device are different.

9. The display device according to claim 2, characterized in that, The driving signal also includes current; The backlight driving module is also configured to: The current of light-emitting devices emitting different light beams is obtained from a preset data source, and the light-emitting devices are driven according to the current and the pulse width modulation signal. Among them, for any two average brightness values, the current of the light-emitting devices emitting different light beams is the same.

10. An electronic device, characterized in that, The electronic device is configured to test the display device provided by any one of claims 1-9, wherein the display device is used to display multiple images and includes a backlight module, the backlight module including light-emitting devices, the light-emitting devices including at least a first light-emitting device and a second light-emitting device, the first light-emitting device and the second light-emitting device emitting light beams with different wavelengths; The electronic device is specifically configured as follows: For any image displayed by the display device, determine the brightness, white field color coordinates of the image, and the driving signals corresponding to the light-emitting devices that emit different light beams when displaying the image; The brightness of different images is different, and the white field color coordinates of different images are within a second preset range. When the display device changes from displaying the first image to displaying the second image, the change ratio of the driving signal of the first light-emitting device is different from the change ratio of the driving signal of the second light-emitting device.

Images