Display apparatus, display method and computer device
By acquiring brightness change data from the display device and adjusting display control parameters and chromaticity, the problem of large color point variations with brightness in DC dimming mode is solved, improving color shift and flicker issues in the display device, and enhancing display performance and customer experience.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- WUHAN CHINA STAR OPTOELECTRONICS TECH CO LTD
- Filing Date
- 2024-11-21
- Publication Date
- 2026-05-15
Smart Images
Figure CN2024133404_15052026_PF_FP_ABST
Abstract
Description
Display devices, display methods, and computer equipment
[0001] This application claims priority to Chinese Patent Application No. 202411608390.0, filed on November 11, 2024, the disclosure of which is incorporated herein by reference in its entirety. Technical Field
[0002] This application relates to, but is not limited to, the field of display technology, specifically to a display device, display method, and computer equipment. Background Technology
[0003] High color gamut display devices utilize color gamut standards including DCI-P3 and Adobe RGB. High color gamut display devices using fluoride phosphors in their light-emitting devices can achieve a color gamut value of 100% DCI-P3 or 100% Adobe RGB. Display devices using blue-green dual-color LED (Light Emitting Diode) chips paired with mass-produced photoresist can achieve color gamut values of 100% DCI-P3 and 100% Adobe RGB. However, in DC dimming mode, the color point of the blue-green dual-color LED chip changes significantly with brightness, resulting in severe color shift at low brightness and a noticeable pinkish tint to the display. Invention Overview
[0004] This application provides a display device, display method, and computer equipment that can improve the problem of color point changes of light-emitting devices with brightness changes in DC dimming mode.
[0005] This application provides a display device, including a display module and a display control module electrically connected to the display module. The display control module includes an acquisition unit and a display adjustment unit. The acquisition unit is configured to acquire brightness change data of the display module when the display module is in DC dimming mode. The display adjustment unit is electrically connected to the acquisition unit and is configured to adjust the display control parameters of the display module according to the brightness change data, thereby adjusting the chromaticity of the display module, and controlling the display module to display according to the adjusted display control parameters and chromaticity.
[0006] This application provides a display method, including: when a display module is using DC dimming mode for display, acquiring brightness change data of the display module; adjusting the display control parameters of the display module according to the brightness change data to adjust the chromaticity of the display module, and controlling the display module to display according to the adjusted display control parameters and chromaticity. Attached Figure Description
[0007] Figure 1 is a schematic diagram of the structure of the display module provided in an embodiment of this application;
[0008] Figure 2 is a spectral comparison diagram provided in an embodiment of this application;
[0009] Figure 3 is a schematic diagram of the driving architecture of the display module provided in an embodiment of this application;
[0010] Figure 4 is a schematic diagram showing how the color point changes with brightness according to an embodiment of this application;
[0011] Figures 5A and 5B are schematic diagrams of the structure of the display device provided in the embodiments of this application.
[0012] Figure 6 is a schematic diagram of the color dot correction level division provided in the embodiment of this application;
[0013] Figure 7 is a schematic diagram of the data voltage corresponding to different color dot correction levels provided in the embodiments of this application;
[0014] Figure 8 is a schematic diagram of the driving architecture of another display module according to an embodiment of this application;
[0015] Figure 9 is a schematic diagram of the relationship between brightness and driving current provided in an embodiment of this application;
[0016] Figure 10 is a schematic diagram of the driving architecture of another display module according to an embodiment of this application;
[0017] Figures 11A-11D are flowcharts of the display method provided in the embodiments of this application;
[0018] Figures 12A and 12B are simulation diagrams of the display method provided in the embodiments of this application. Embodiments of the present invention
[0019] The following is an overview of the subject matter described in detail herein, and this overview is not intended to limit the scope of the claims. To make the objectives, technical solutions, and effects of this application clearer and more explicit, the following describes this application in further detail with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.
[0020] This application provides a display device and a display method. The display device includes a display control module, which adjusts the display control parameters of the display module according to the brightness change data of the display module when the display module is in DC dimming mode, thereby adjusting the color of the display module to improve the problem that the color point of the light-emitting device changes greatly with the brightness change in DC dimming mode.
[0021] Figure 1 is a schematic diagram of the structure of the display module provided in an embodiment of this application. The display module includes a display panel 10 and a backlight module 20.
[0022] Optionally, the display panel 10 includes a passive light-emitting display panel. The passive light-emitting display panel may include a liquid crystal display panel, etc.
[0023] The display panel 10 may include an array substrate 101 and a color filter substrate 102 disposed opposite to each other, with liquid crystal molecules disposed between the array substrate 101 and the color filter substrate 102. An encapsulation layer 103 or other film layer may also be disposed on the color filter substrate 102. Conductive terminals are disposed on the array substrate 101, and devices such as a flip-chip film 104 are connected to the conductive terminals via a medium such as a conductive adhesive 105. One end of the flip-chip film 104 can be bent along the backlight module 20 to the back of the backlight module 20 and connected to the back of the backlight module 20 via a medium such as an adhesive.
[0024] The backlight module 20 is disposed on the side of the array substrate 101 away from the color filter substrate 102. The side of the array substrate 101 away from the color filter substrate 102 may be provided with a backplate 106 and other film layers. The backlight module 20 includes backlight 201, light guide plate 202 and other devices.
[0025] Optionally, the backlight 201 includes a light-emitting device. This light-emitting device can be a monochromatic light-emitting device or a multi-color light-emitting device. Optionally, the multi-color light-emitting device includes a dual-color light-emitting device (such as a blue-green dual-color LED chip). Here, LED stands for Light Emitting Diode.
[0026] Optionally, the backlight module 20 can provide monochrome backlight to the display panel 10. The liquid crystal display panel 10 receives the backlight provided by the backlight source 201 and achieves multicolor display by controlling the deflection angle of the liquid crystal molecules and cooperating with multiple color filter units on the color filter substrate 102 and polarizers on the display panel 10.
[0027] Taking a blue-green dual-color LED chip as an example, the backlight 201 includes a blue LED chip 2011 and a green LED chip 2022, and also contains fluoride phosphor. Therefore, the blue-green dual-color LED chip itself does not provide red backlight to the display panel 10. If the display module still wants to display red, the color filter unit on the color filter substrate 102 can include a red color filter unit. By coordinating the red color filter unit with the light emitted by the backlight 201, the deflection angle of the liquid crystal molecules, the polarizer, etc., the display module can achieve red display. The fluoride phosphor KSF can include potassium fluorosilicate (i.e., K2SiF6:Mn4+) containing tetravalent manganese ions.
[0028] Figure 2 is a spectral comparison diagram provided in the embodiments of this application. High color gamut display devices, including those using fluoride phosphors, can achieve a color gamut of 100% DCI-P3 or 100% Adobe RGB. A quantum dot film solution, formed by adding quantum dot materials to the light-emitting device, can further achieve 100% DCI-P3 and 100% Adobe RGB. However, the quantum dot film solution, which incorporates quantum dot materials into the light-emitting device, suffers from insufficient reliability, resulting in a bluish tinge around the edges of the display. Furthermore, currently mass-producible solutions also have the problem of containing cadmium.
[0029] Based on current end-customer demand for cadmium-free dual 100% color gamut (i.e., 100% DCI-P3 and 100% Adobe RGB), integrating a green LED chip into a blue-green dual-color LED chip can reduce the half-width at half-maximum (WHM) of the green light spectrum and improve the color gamut (as shown at point A in Figure 2). Display devices paired with mass-produced photoresist have been tested and found to meet the dual 100% color gamut requirements (as shown by curve L1 in Figure 2). However, unlike the KSF 540 solution (as shown by curve L2 in Figure 2), display devices meeting the dual 100% color gamut requirements exhibit significant color point changes in the blue-green dual-color LED chips as brightness decreases in DC dimming mode. This leads to color shift and noticeable pinking issues when the display is at low brightness. Although display devices meeting the dual 100% color gamut requirements show normal color shift in PWM (Pulse Width Modulation) dimming mode, flickering issues exist, reducing end-customer acceptance of PWM dimming mode.
[0030] It should be noted that fluoride phosphors can significantly improve the color gamut coverage of display devices. Color gamut coverage refers to the percentage of the area of the triangle formed by the coordinates of the red, green, and blue primary colors displayed by the display device, relative to the entire CIE color space. Color gamut coverage is a key indicator of a display device's ability to reproduce the colors of real objects. The CIE color space is a color space standard developed by the International Commission on Illumination (CIE).
[0031] Figure 3 is a schematic diagram of the driving architecture of the display module provided in this application embodiment, and Figure 4 is a schematic diagram of the color point changing with brightness provided in this application embodiment. In Figure 4, LA represents the curve of color point changing with brightness in a display device where the backlight module 20 does not use blue-green dual-color LED chips as a backlight source, under the corresponding PWM dimming mode; LB represents the curve of color point changing with brightness in a display device where the backlight module 20 does not use blue-green dual-color LED chips as a backlight source, under the corresponding DC dimming mode; LC represents the curve of color point changing with brightness in a display device where the backlight module 20 uses blue-green dual-color LED chips as a backlight source, under the corresponding PWM dimming mode; and LD represents the curve of color point changing with brightness in a display device where the backlight module 20 uses blue-green dual-color LED chips as a backlight source, under the corresponding DC dimming mode. Curves LA to LD each correspond to six brightness nodes, which represent 100% brightness, 50% brightness, 20% brightness, 10% brightness, 5% brightness, and 2% brightness, respectively.
[0032] Please refer to Figures 3 and 4. The light-emitting driver chip 203 converts the received brightness information into a control signal in DC dimming mode to control the green and blue LED chips in the blue-green dual-color LED chip to emit light simultaneously. The brightness information can be represented as a control signal in PWM dimming mode. However, in DC dimming mode, the driving currents corresponding to the green and blue LED chips have the same adjustment range, causing the color coordinates Wx and Wy to change as the display brightness decreases from 100% to 1%, as shown by curve LD in Figure 3. Here, Wx changes by approximately 0.03, and Wy decreases by approximately 0.07. The fluctuation range of the color coordinate Wy does not consider the color point situation corresponding to 1% brightness. Compared to the display devices where the backlight module 20 does not use blue-green dual-color LED chips as a backlight source, and the display devices where the backlight module 20 uses blue-green dual-color LED chips as a backlight source, the color point variation with brightness in DC dimming mode and PWM dimming mode is greater (corresponding to curves LA and LB in Figure 3), resulting in a more noticeable pinkish tint in the display devices using blue-green dual-color LED chips as a backlight source in DC dimming mode.
[0033] It should be noted that, besides blue-green dual-color LED chips, conventional LED devices also exhibit color point variations with brightness when used in display devices. However, compared to blue-green dual-color LED chips, the variation in color point of conventional LED devices with brightness is relatively smaller. Therefore, display devices using conventional LED devices may also experience display problems due to the color point variation of the LED devices with brightness.
[0034] Therefore, this application provides a display device and display method to improve the problem that the color point of the light-emitting device changes significantly with changes in brightness under DC dimming mode.
[0035] Figures 5A and 5B are schematic diagrams of the structure of a display device provided in an embodiment of this application. This application provides a display device including a display module 12. The display module 12 includes a display panel 10. The display panel 10 includes a plurality of sub-pixels.
[0036] The display module 12 may include a backlight module 20, which includes multiple backlight sources configured to provide backlighting to the display panel 10. Optionally, the backlight sources include monochromatic light-emitting devices and dual-color light-emitting devices. The dual-color light-emitting devices include dual-color LED chips.
[0037] The display module 12 also includes a display control module 30, which is electrically connected to the display module 12 and is configured to control the display module 12 to perform a display.
[0038] The display control module 30 includes an acquisition unit 301 and a display adjustment unit 302.
[0039] The acquisition unit 301 is configured to acquire the brightness change data of the display module 12 when the display module 12 is in DC dimming mode.
[0040] The display adjustment unit 302 is electrically connected to the acquisition unit 301. The display adjustment unit 302 is configured to adjust the display control parameters of the display module 12 according to the brightness change data, so as to adjust the chromaticity of the display module 12, and control the display module 12 to display according to the adjusted display control parameters and chromaticity.
[0041] When the display module 12 is used in DC dimming mode, the color compensation function is enabled by the display control module 30 to adjust the display control parameters of the display module 12 according to the brightness change data of the display module 12, thereby adjusting the color of the display module 12 and improving the problem that the color point of the light-emitting device of the display module 12 changes greatly with the brightness change in DC dimming mode.
[0042] Optionally, the acquisition unit 301 and the display adjustment unit 302 can be implemented by devices such as a timing controller, a source driver, and a gate driver. These devices acquire brightness change data of the display module 12 through image signals received from the timing controller and other devices. The timing controller, source driver, and other devices adjust the display control parameters. The cooperation between the source driver, gate driver, and other devices enables the display module to display according to the adjusted display control parameters and chromaticity. The source driver can output data voltage to multiple sub-pixels.
[0043] Optionally, the display control parameters may include the data voltage received by the sub-pixels in the display module and the driving current received by the light-emitting devices. The light-emitting devices include conventional LED devices, blue-green dual-color LED chips, etc.
[0044] Accordingly, when the display module 12 is used in DC dimming mode for display, the display control module 30 is configured to adjust the data voltage received by the multiple sub-pixels or the driving current that drives the backlight to emit light, so as to adjust the color of the display module 12.
[0045] When dimming mode is enabled, the brightness of display module 12 changes, and the color point changes with the brightness, with these changes accumulating over time. Therefore, the color point can be corrected according to different brightness levels, and the accumulated deviations from the expected changes in the color point can be corrected at certain intervals of brightness change, thus achieving the effect of color point correction.
[0046] Accordingly, referring to Figure 5A, the display adjustment unit 302 includes a first judgment unit 3021 and a parameter control unit 3022. The first judgment unit 3021 is electrically connected to the acquisition unit 301, and is configured to determine whether the brightness change data is equal to a preset brightness value. The parameter control unit 3022 is electrically connected to the first judgment unit 3021. When the brightness change data is equal to the preset brightness value, the parameter control unit 3022 is configured to adjust the data voltage received by multiple sub-pixels in the display module 12 according to the relationship between the preset brightness value and the data voltage.
[0047] The brightness change data can correspond to a gradual decrease from 100% brightness to 1% brightness, and the preset brightness value can be set to at least one of 100% brightness to 1% brightness. For example, the preset brightness value can be set to at least one of 100% brightness, 50% brightness, 20% brightness, 10% brightness, 5% brightness, and 2% brightness. Correspondingly, the color correction for the brightness change data can be divided into different levels. As shown in Figure 6, which is a schematic diagram of the color correction levels provided in the embodiments of this application, taking the preset brightness values of 100%, 75%, 50%, 20%, 10%, 5%, and 2% as examples, the color correction corresponding to the brightness change data from 100% to 50% is the first level, the color correction corresponding to the brightness change data from 50% to 20% is the second level, the color correction corresponding to the brightness change data from 20% to 10% is the third level, the color correction corresponding to the brightness change data from 10% to 5% is the fourth level, the color correction corresponding to the brightness change data from 5% to 2% is the fifth level, and the color correction corresponding to the brightness change data from 2% to 1% is the sixth level.
[0048] Understandably, preset brightness values can be set according to actual needs, and the minimum difference between two preset brightness values can also be set according to actual needs. For example, the minimum difference between two preset brightness values can be 0.5%.
[0049] Because the change in the color point of the light-emitting device corresponding to the low brightness of the display module 12 is greater than the change in the color point of the light-emitting device corresponding to the high brightness of the display module 12, X preset brightness values less than 50% brightness and Y preset brightness values greater than 50% brightness can be set, X>Y, so that the interval period for correcting the color point when the display module 12 displays low brightness is less than the interval period for correcting the color point when the display module 12 displays high brightness, thereby reducing the difference in the change in the color point with brightness when the display module 12 displays high brightness and low brightness.
[0050] Because the display brightness of the display module 12 changes over time, the brightness change data of the display module 12 can be different for different time periods. Therefore, when the brightness change data is not equal to the preset brightness value, the first judgment unit 3021 can be used again to determine whether the brightness change data is equal to the preset brightness value, so as to realize the determination of whether the brightness change data at different times is equal to the preset brightness value.
[0051] The relationship between the preset brightness value and the data voltage can be obtained through debugging, and this relationship can be pre-stored in memory. Optionally, the relationship between the preset brightness value and the data voltage can be stored in the form of a compensation table.
[0052] Optionally, the display control module includes a memory for storing the relationship between preset brightness values and data voltages.
[0053] Since different data voltages can achieve different brightness displays, the data voltages received by sub-pixels of different emitting colors can be different. Therefore, the relationship between the preset brightness value and the data voltage can correspond to the relationship between the preset brightness value and the brightness to be displayed for different emitting color sub-pixels, or the relationship between the preset brightness value and the data voltage can correspond to the relationship between the preset brightness value and the display grayscale of different emitting color sub-pixels. For example, if multiple sub-pixels include a first sub-pixel, a second sub-pixel, and a third sub-pixel, and the emitting colors of the first, second, and third sub-pixels are different, the color point correction for brightness changes from 100% to 1% is divided into six levels, as shown in Table 1. The values corresponding to the first to third sub-pixels can be the display grayscale or the brightness to be displayed. Correspondingly, the timing sequence of the data voltage for different color point correction levels is shown in Figure 7.
[0054]
[0055] It should be noted that the data voltage corresponding to the first sub-pixel can be the first data voltage, the data voltage corresponding to the second sub-pixel can be the second data voltage, and the data voltage corresponding to the third sub-pixel can be the third data voltage. In Figure 7, the first data voltage can correspond to the data voltage of a pure red display, the second data voltage can correspond to the data voltage of a pure green display, and the third data voltage can correspond to the data voltage of a pure blue display.
[0056] Understandably, the more color correction levels there are, the more precise the color correction will be; the smaller the range of color variation, the better the color correction effect. Therefore, in practical applications, the number of color correction levels should be set according to actual needs.
[0057] Figure 8 is a schematic diagram of the driving architecture of another display module according to an embodiment of this application. In the scheme of classifying color point correction, the timing controller and other logic control devices receive the image signal (i.e., corresponding to PWMI in Figure 8), and determine whether to call the color compensation function based on the received image signal. They also output a control signal (i.e., PWMO) to the display panel 10 and the display module 12 to control the brightness of the display panel 10 in conjunction with the light-emitting device in the backlight module 20 to achieve display. The image signal received and the control signal output by the timing controller can correspond to the control signal of the PWM dimming mode. The backlight driver chip in the backlight module 20 converts the received signal into a control signal under DC dimming mode to control the light-emitting device to emit light. Whether to call the color compensation function can be implemented by executing the written code through the timing controller and other devices.
[0058] Besides adjusting the data voltage, color point correction can also be achieved from the perspective of the light-emitting device, thus addressing the issue at its source. For example, the driving current of the light-emitting device affects its brightness, which in turn affects the backlight brightness received by the display panel 10, and consequently, the display performance of the display panel 10. In other words, the brightness of the light-emitting device affects the display brightness of the display panel 10. Therefore, the relationship between the brightness duty cycle of the backlight module 20 and the brightness duty cycle of the display panel 10 can be pre-stored to control the backlight brightness provided by the backlight module 20 to the display panel 10 when the brightness of the display module 12 needs to be changed.
[0059] Optionally, the backlight module 20 includes a backlight source 201 that is a dual-color light-emitting chip. The dual-color light-emitting chip may include blue-green LED chips, etc.
[0060] Accordingly, referring to Figure 5B, the display adjustment unit 302 is configured to obtain the driving current ratio of the two light-emitting devices driving the dual-color light-emitting chip in the display module 12 based on the brightness change data and a preset brightness change compensation function, and adjust the driving current of the two light-emitting devices driving the dual-color light-emitting chip according to the driving current ratio. The display control parameters include the driving current ratio.
[0061] The brightness variation compensation function reflects the relationship between the brightness duty cycle of the display module 12 and the brightness duty cycle of the two light-emitting devices in the dual-color light-emitting chip. The ratio of the driving currents that drive the two light-emitting devices in the dual-color light-emitting chip can be obtained based on the ratio of the brightness duty cycles of the two light-emitting devices.
[0062] Accordingly, the display adjustment unit 302 is configured to obtain the brightness duty cycle of the two light-emitting devices based on the brightness change data and the preset brightness change compensation function, and adjust the driving current of the two light-emitting devices driving the dual-color light-emitting chip according to the brightness duty cycle of the two light-emitting devices.
[0063] Optionally, a brightness change compensation function can be fitted using a timing controller or other logic control device, and the brightness change compensation function can be stored in a memory.
[0064] Optionally, the display adjustment unit 302 may include a calculation unit and a parameter control unit. The calculation unit is configured to obtain the driving current ratio of the two light-emitting devices driving the dual-color light-emitting chip in the display module based on the brightness change data and a preset brightness change compensation function. The parameter control unit is configured to adjust the driving current of the two light-emitting devices driving the dual-color light-emitting chip according to the driving current ratio. The calculation unit may be implemented by a logic controller, and the parameter control unit may be implemented by a backlight driver chip.
[0065] Optionally, the parameter control unit may include a first light-emitting driver chip and a second light-emitting driver chip, and the two light-emitting devices in the dual-color light-emitting chip include a first light-emitting device and a second light-emitting device. The first light-emitting driver chip is configured to generate a first target driving current according to the brightness duty cycle corresponding to the first light-emitting device to drive the first light-emitting device to emit light, and the second light-emitting driver chip is configured to generate a second target driving current according to the brightness duty cycle corresponding to the second light-emitting device to drive the second light-emitting device to emit light.
[0066] The following explanation uses a dual-color LED chip, specifically a blue-green LED chip, as an example. Figure 9 is a schematic diagram of the relationship between brightness and driving current provided in an embodiment of this application, and Figure 10 is a schematic diagram of the driving architecture of another display module 12 in an embodiment of this application. Based on the light-emitting principle of blue-green LED chips, with the fluoride phosphor material fixed, the current ratio of the green LED chip and the blue LED chip determines the chromaticity value of the white display screen of the display module 12. Therefore, different current ratios of the green LED chip and the blue LED chip result in different display brightness of the display module 12. Therefore, based on actual measurements and simulation analysis, the brightness change compensation function corresponding to the blue LED chip is obtained as B=0.0009x^2+0.9088x+0.3147, and the brightness change compensation function corresponding to the green LED chip is obtained as G=0.0011x^2+0.8684x+1.8129. In Figure 9, x corresponds to the brightness duty cycle of the display module 12, and y corresponds to the brightness percentage (i.e., driving current percentage) of the green LED chip and the blue LED chip. L3 represents the relationship curve between the brightness of the display module 12 and the driving current of the blue LED chip, and L4 represents the relationship curve between the brightness of the display module 12 and the driving current of the green LED chip.
[0067] Please refer to Figure 10. When the image signal (corresponding to PWMI) received by the logic controller (such as a control chip) corresponds to a brightness change requirement, the logic controller calculates the brightness duty cycle requirement (corresponding to PWMO_G) for the green LED chip (i.e., the first light-emitting device) and the brightness duty cycle requirement (corresponding to PWMO_B) for the blue LED chip (i.e., the second light-emitting device) based on the brightness duty cycle of the green LED chip. Then, the first light-emitting driver chip generates a driving current (corresponding to DC_G) based on the brightness duty cycle of the green LED chip to drive the green LED chip to emit light; and the second light-emitting driver chip generates a driving current (corresponding to DC_B) based on the brightness duty cycle of the blue LED chip to drive the blue LED chip to emit light. The logic controller calculates the brightness duty cycle requirement of the green LED chip based on the written brightness change compensation function.
[0068] Furthermore, when the display module 12 is in DC dimming mode, the color shift problem that occurs when the display module 12 displays low brightness is more severe than the color shift problem that occurs when displaying high brightness. Therefore, in order to improve the color shift problem that occurs when the display module 12 displays low brightness, a hybrid dimming scheme can be adopted to set the dimming requirements of the display module 12.
[0069] Accordingly, the display control module further includes a second judgment unit 304, which is electrically connected to the acquisition unit 301. The second judgment unit 304 is configured to determine whether the brightness duty cycle of the display module 12 is within a first preset range based on the display control data of the display module 12 acquired by the acquisition unit 301. Specifically, when the brightness duty cycle of the display module 12 is within the first preset range, the display module 12 uses the DC dimming mode to achieve dimming. When the brightness variation of the display module 12 is not within the first preset range, a pulse width modulation dimming mode (PWM dimming mode) is used to achieve dimming.
[0070] The first preset range can be set to the brightness variation range corresponding to the display module 12 displaying high brightness. For example, the first preset range can be set to 100% brightness to 50% brightness. It can be understood that the first preset range is preferentially set to the brightness variation range corresponding to the display module 12 displaying no color shift problem or a minor color shift problem when DC dimming mode is enabled.
[0071] Figures 11A to 11D are flowcharts of the display method provided in the embodiments of this application. The embodiments of this application also provide a display method that can be applied to any of the above-mentioned display devices.
[0072] Please refer to Figure 11A. The display method includes:
[0073] When the display module is using DC dimming mode, acquire the brightness change data of the display module;
[0074] Based on the brightness change data, the display control parameters of the display module are adjusted to adjust the chromaticity of the display module, and the display module is controlled to display according to the adjusted display control parameters and chromaticity.
[0075] When the display module is used in DC dimming mode, the color compensation function is enabled to improve the problem that the color point of the light-emitting device changes significantly with brightness in DC dimming mode.
[0076] Please refer to Figure 11B. When correcting the color point by setting different brightness levels, the step of adjusting the display control parameters of the display module based on the brightness change data includes:
[0077] Determine whether the brightness change data equals the preset brightness value;
[0078] When the brightness change data equals the preset brightness value, the data voltage received by multiple sub-pixels in the display module is adjusted according to the relationship between the preset brightness value and the data voltage.
[0079] Optionally, a device such as a timing controller can be used to determine whether the brightness change data is equal to a preset brightness value. The data voltage can be adjusted using a timing controller, source driver, or other devices.
[0080] Please refer to Figure 11B. After the step of determining whether the brightness change data is equal to the preset brightness value, the method further includes: when the brightness change data is not equal to the preset brightness value, performing the determination of whether the brightness change data is equal to the preset brightness value again.
[0081] To correct color points when the brightness change data equals a preset brightness value, the data voltage received by multiple sub-pixels in the display module can be adjusted according to the relationship between the preset brightness value and the data voltage. This can be done in advance to obtain and store the relationship between the preset brightness value and the data voltage.
[0082] Accordingly, before the step of adjusting the data voltage received by multiple sub-pixels in the display module according to the relationship between the preset brightness value and the data voltage, the method includes:
[0083] When the display module is in DC dimming mode and the test screen is displayed, acquire the brightness change data of the display module;
[0084] When the brightness change data equals the preset brightness value, determine whether the chromaticity data corresponding to the preset brightness value equals the target chromaticity data;
[0085] When the chromaticity data corresponding to the preset brightness value is not equal to the target chromaticity data, the data voltage received by multiple sub-pixels is adjusted so that the chromaticity data corresponding to the preset brightness value is equal to the target chromaticity data.
[0086] The preset brightness value and the data voltage received by the sub-pixel when the chromaticity data corresponding to the preset brightness value is equal to the target chromaticity data are associated and stored to obtain the relationship between the preset brightness value and the data voltage.
[0087] The test screen can include pure red, pure green, pure blue, etc. When the display module is in DC dimming mode to display the test screen, the brightness change data also corresponds to changing from 100% brightness to 1%. The target chromaticity data can be the specification center value. The specification center value can be the chromaticity data corresponding to the central display area of the display panel 10 in the display module. The central display area includes at least one pixel, each pixel includes multiple sub-pixels, and the emission colors of multiple sub-pixels located in the same pixel can be different.
[0088] It should be noted that multiple sub-pixels can correspond to sub-pixels with different emission colors. For example, multiple sub-pixels may include a first sub-pixel, a second sub-pixel, and a third sub-pixel, and the first, second, and third sub-pixels emit different emission colors. Understandably, the data voltage received by the first, second, and third sub-pixels can be set differently depending on the actual display requirements.
[0089] Optionally, the first sub-pixel emits light in red, the second sub-pixel emits light in green, and the third sub-pixel emits light in blue.
[0090] Optical equipment such as a colorimeter can be used to help determine whether the chromaticity data corresponding to the preset brightness value is equal to the target chromaticity data. The relationship between the preset brightness value and the data voltage can be stored using devices such as memory.
[0091] For ease of use, the compensation processes for different color point correction levels can be integrated into the same control logic. This allows the relationship between the preset brightness value and the data voltage for different color point correction levels to be invoked based on the changes in brightness data as the brightness data gradually changes from 100% to 1%.
[0092] Optionally, the color correction level can be set to two or more levels. To ensure that the above display method is applicable to multiple display modules, the relationship between preset brightness values and data voltages can be obtained for multiple display modules. Then, the average of the preset brightness values and data voltages for multiple display modules is taken to obtain a display method applicable to multiple display modules. Accordingly, in scenarios where color point fluctuations in the film materials, light guide plates, or light-emitting devices used in the display modules result in a large range of color point specifications for the display modules, the above display method can also be used to correct the color points.
[0093] In addition, multiple display modules can each have a corresponding preset brightness value and data voltage relationship. The preset brightness value and data voltage relationship of each of the multiple display modules can be centrally stored and individually called when needed, so that the above display method can be applied to scenarios with strict color point specifications, thereby realizing individual adjustment of each display module.
[0094] Please refer to Figure 11C. In practical applications, the process involves several steps: lighting up the display screen of display panel 10, controlling the display's color to meet design requirements, and ensuring that the DC dimming mode is not activated. By collecting tristimulus values at different grayscale levels corresponding to different display images, and analyzing the collected tristimulus data, the process determines whether to enable the adjustment of display control parameters by calling the algorithm interface (i.e., the part corresponding to auto_gamma_Library.dll in Figure 11C). Afterward, the adjusted display control parameters are stored in a storage device, and color point and brightness detection processes (i.e., ΔE control process and optical detection process) are activated to verify whether the adjusted display control parameters can make the color point meet the requirements. The storage device can be integrated into the timing controller. Optionally, the storage device can be volatile or non-volatile memory. After storing the adjusted display control parameters in the storage device, it can be determined whether the data has been successfully stored. If the data has not been successfully stored, the timing controller is reset, and the steps of controlling the display's color to meet design requirements and ensuring that the DC dimming mode is not activated are re-executed. Once the data is successfully stored, the detection process for color point, brightness, etc., can begin.
[0095] Please refer to Figure 11D. When correcting color points from the perspective of the light-emitting device, the step of adjusting the display control parameters of the display module based on the brightness change data includes:
[0096] Based on the brightness change data and the preset brightness change compensation function, the driving current ratio of the two light-emitting devices of the dual-color light-emitting chip in the driving display module is obtained.
[0097] The driving current of the two light-emitting devices driving the dual-color light-emitting chip is adjusted according to the driving current ratio; among which, the display control parameters include the driving current ratio.
[0098] Optionally, the ratio of the driving currents for the two light-emitting devices in the dual-color light-emitting chip can be obtained based on the ratio of the duty cycles of the luminous brightness of the two light-emitting devices.
[0099] Accordingly, the steps of obtaining the driving current ratio of the two light-emitting devices driving the dual-color light-emitting chip in the display module based on the brightness change data and a preset brightness change compensation function, and adjusting the driving current of the two light-emitting devices driving the dual-color light-emitting chip according to the driving current ratio, include:
[0100] Based on the brightness change data and the preset brightness change compensation function, the brightness duty cycle of the two light-emitting devices is obtained, so as to adjust the driving current of the two light-emitting devices driving the dual-color light-emitting chip according to the brightness duty cycle of the two light-emitting devices.
[0101] To obtain the brightness variation compensation function, before the step of obtaining the driving current ratio of the two light-emitting devices driving the dual-color light-emitting chip in the display module, the following steps are included:
[0102] The control unit displays the test image in DC dimming mode and acquires the brightness change data of the display module.
[0103] When the chromaticity data corresponding to the brightness change data is not equal to the target chromaticity data, adjust the driving current ratio of the two light-emitting devices driving the dual-color light-emitting chip so that the chromaticity data corresponding to the brightness change data is equal to the target chromaticity data.
[0104] The driving current ratio corresponding to the target chromaticity data is used as the target current ratio, and a luminance change compensation function is obtained by fitting the luminance change data and the target current ratio.
[0105] Optionally, the drive current ratio can be adjusted by coordinating devices such as a timing controller and a light-emitting driver chip. A brightness change compensation function can be fitted using logic control devices such as a timing controller.
[0106] Furthermore, when using a hybrid dimming scheme to set the dimming requirements of the display module, before the step of enabling DC dimming mode for display, the following steps are included:
[0107] Determine whether the brightness duty cycle of the display module is within the first preset range based on the display control data of the display module;
[0108] When the brightness duty cycle of the display module is within the first preset range, the display module is controlled to enable DC dimming mode for display.
[0109] The display control data can be image signals received by devices such as timing controllers, and these image signals can be image signals to be displayed by the display module.
[0110] Accordingly, after the step of determining whether the brightness duty cycle of the display module is within a first preset range based on the display control data of the display module, the method includes:
[0111] When the brightness duty cycle of the display module is not within the first preset range, the display module is controlled to enable pulse width modulation dimming mode for display.
[0112] For example, the first preset range is 100% brightness to 50% brightness, and the second preset range is 50% brightness to 1% brightness. When the brightness duty cycle of the display module is within the first preset range, the display module uses DC dimming mode for display. When the brightness duty cycle of the display module is within the second preset range, the display module uses pulse width modulation dimming mode for display.
[0113] Understandably, when a new dimming mode is available, the display module can also be set with multiple preset ranges, such as a third preset range, to integrate different dimming modes and achieve display control of the display module.
[0114] Figures 12A and 12B are simulation diagrams of the display method provided in the embodiments of this application. Among them, Figure 12A is a simulation curve of the color point changing with brightness obtained by applying the color point correction grading method; Figure 12B is a simulation curve of the color point changing with brightness obtained by applying the brightness change compensation function.
[0115] As shown in Figure 12A, the chromatic aberration changes as the brightness changes from 100% to 55%. When the brightness changes to 55%, the chromatic aberration is corrected based on the relationship between the preset brightness value and the data voltage, bringing it closer to the chromatic aberration corresponding to 100% brightness. This process continues as the brightness changes, and the chromatic aberration changes accordingly, until the brightness changes again to another preset brightness value. At this point, the chromatic aberration is corrected again, and so on, resulting in a simulation curve showing how the chromatic aberration changes with brightness. Therefore, the variation range of the chromatic aberration coordinate Wx is approximately 0.008. Because the brightness expression capability of 1% is relatively small, the chromaticity corresponding to 1% brightness is not readily perceptible to the human eye. Therefore, without considering the chromatic aberration corresponding to 1% brightness, the fluctuation range of the chromatic aberration coordinate Wy is approximately 0.02.
[0116] As shown in Figure 12B, by correcting the color point according to the brightness change compensation function, the variation range of the color coordinate Wx can be reduced to approximately 0.006, and the variation range of the color coordinate Wy can be approximately 0.008.
[0117] Therefore, as shown in Figures 12A and 12B, the display method provided in this application can improve the problem of color point variation of the light-emitting device with brightness changes in DC dimming mode. Correspondingly, it can improve the problem of severe color shift and obvious powdery appearance caused by the color point variation of the light-emitting device with brightness changes in the display module.
[0118] The display device and display method provided in this application can improve the situation where the color point changes significantly with brightness. When an end user adjusts the brightness of the display screen, the degree of color shift in the display device is reduced.
[0119] Furthermore, by adjusting the driving current and then the color point, the data voltage received by the sub-pixels will not be affected, nor will the transmittance of the display module be affected.
[0120] This application may also provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of any of the above-described display methods.
[0121] This application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of any of the above-described display methods.
[0122] Those skilled in the art should understand that modifications or equivalent substitutions can be made to the embodiments of this application without departing from the spirit and scope of this application, and such modifications or equivalent substitutions should all be covered within the scope of this application. The embodiments can be combined with each other, but will not be described in detail here.
[0123] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.
Claims
1. A display device, wherein, Includes a display module and a display control module electrically connected to the display module; The display control module includes: The acquisition unit is configured to acquire brightness change data of the display module when the display module is enabled to display in DC dimming mode; The display adjustment unit, electrically connected to the acquisition unit, is configured to adjust the display control parameters of the display module according to the brightness change data, so as to adjust the chromaticity of the display module, and control the display module to display according to the adjusted display control parameters and chromaticity.
2. The display device according to claim 1, wherein, The display adjustment unit includes: The first judgment unit is electrically connected to the acquisition unit and is configured to judge whether the brightness change data is equal to a preset brightness value. The parameter control unit is electrically connected to the first judgment unit; Wherein, when the brightness change data is equal to the preset brightness value, the parameter control unit is configured to adjust the data voltage received by multiple sub-pixels in the display module according to the relationship between the preset brightness value and the data voltage; wherein, the display control parameters include the data voltage.
3. The display device according to claim 1, wherein, The display adjustment unit is configured to obtain the driving current ratio of the two light-emitting devices driving the dual-color light-emitting chip in the display module based on the brightness change data and a preset brightness change compensation function, and adjust the driving current of the two light-emitting devices driving the dual-color light-emitting chip according to the driving current ratio; wherein, the display control parameters include the driving current ratio.
4. The display device according to claim 3, wherein, The display adjustment unit is configured to obtain the brightness duty cycle of the two light-emitting devices based on the brightness change data and the preset brightness change compensation function, and adjust the driving current of the two light-emitting devices according to the brightness duty cycle of the two light-emitting devices.
5. The display device according to claim 4, wherein, The display module includes a backlight module, and the backlight module includes the dual-color light-emitting chip.
6. The display device according to claim 4, wherein, The two light-emitting devices include a first light-emitting device and a second light-emitting device, and the display adjustment unit includes: A first light-emitting driver chip is configured to generate a first target driving current based on the brightness duty cycle corresponding to the first light-emitting device, so as to drive the first light-emitting device to emit light; and The second light-emitting driver chip is configured to generate a second target driving current according to the brightness duty cycle corresponding to the second light-emitting device, so as to drive the second light-emitting device to emit light.
7. The display device according to claim 1, wherein, The display control module further includes: The second judgment unit is electrically connected to the acquisition unit and is configured to determine whether the brightness duty cycle of the display module is within a first preset range based on the display control data of the display module acquired by the acquisition unit. When the brightness duty cycle of the display module is within the first preset range, the display module enables the DC dimming mode for display.
8. The display device according to claim 1, wherein, The display module includes: The display panel includes multiple sub-pixels; The backlight module includes multiple backlight sources configured to provide backlight to the display panel.
9. A display method, wherein, In a display device as described in any one of claims 1 to 8, the display method includes: When the display module is used in DC dimming mode, the brightness change data of the display module is acquired; Based on the brightness change data, the display control parameters of the display module are adjusted to adjust the chromaticity of the display module, and the display module is controlled to display according to the adjusted display control parameters and chromaticity.
10. The display method according to claim 9, wherein, The step of adjusting the display control parameters of the display module based on the brightness change data includes: Determine whether the brightness change data is equal to a preset brightness value; When the brightness change data equals the preset brightness value, the data voltage received by multiple sub-pixels in the display module is adjusted according to the relationship between the preset brightness value and the data voltage; wherein, the display control parameters include the data voltage.
11. The display method according to claim 9, wherein, The step of adjusting the display control parameters of the display module based on the brightness change data includes: Based on the brightness change data and the preset brightness change compensation function, the driving current ratio of the two light-emitting devices driving the dual-color light-emitting chip in the display module is obtained. The driving current of the two light-emitting devices driving the dual-color light-emitting chip is adjusted according to the driving current ratio; wherein, the display control parameters include the driving current ratio.
12. The display method according to claim 9, wherein, Prior to the step of displaying the module in DC dimming mode, the following steps are included: Determine whether the brightness duty cycle of the display module is within the first preset range based on the display control data of the display module; When the brightness duty cycle of the display module is within the first preset range, the display module is controlled to enable DC dimming mode for display.
13. The display method according to claim 10, wherein, Before the step of adjusting the data voltage received by multiple sub-pixels in the display module according to the relationship between the preset brightness value and the data voltage, the following steps are included: When the display module is in DC dimming mode and displays the test screen, acquire the brightness change data of the display module; When the brightness change data equals a preset brightness value, determine whether the chromaticity data corresponding to the preset brightness value equals the target chromaticity data; When the chromaticity data corresponding to the preset brightness value is not equal to the target chromaticity data, the data voltage received by the multiple sub-pixels is adjusted so that the chromaticity data corresponding to the preset brightness value is equal to the target chromaticity data; The preset brightness value and the data voltage received by the sub-pixel when the chromaticity data corresponding to the preset brightness value is equal to the target chromaticity data are associated and stored to obtain the relationship between the preset brightness value and the data voltage.
14. The display method according to claim 11, wherein, The steps of obtaining the driving current ratio of the two light-emitting devices driving the dual-color light-emitting chip in the display module based on the brightness change data and a preset brightness change compensation function, and adjusting the driving current of the two light-emitting devices driving the dual-color light-emitting chip according to the driving current ratio, include: Based on the brightness change data and the preset brightness change compensation function, the brightness duty cycle of the two light-emitting devices is obtained, so as to adjust the driving current of the two light-emitting devices driving the dual-color light-emitting chip according to the brightness duty cycle of the two light-emitting devices.
15. The display method according to claim 11, wherein, Before obtaining the driving current ratio of the two light-emitting devices driving the dual-color light-emitting chip in the display module, the following steps are included: The display module is controlled to display the test screen in DC dimming mode, and the brightness change data of the display module is acquired. When the chromaticity data corresponding to the brightness change data is not equal to the target chromaticity data, the driving current ratio of the two light-emitting devices driving the dual-color light-emitting chip is adjusted so that the chromaticity data corresponding to the brightness change data is equal to the target chromaticity data; The driving current ratio corresponding to the target chromaticity data is used as the target current ratio, and the luminance change compensation function is obtained by fitting the luminance change data and the target current ratio.
16. The display method according to claim 12, wherein, After the step of determining whether the brightness duty cycle of the display module is within a first preset range based on the display control data of the display module, the following steps are included: When the brightness duty cycle of the display module is not within the first preset range, the display module is controlled to enable pulse width modulation dimming mode for display.
17. A computer device, wherein, include: A processor that, when executing a computer program, implements the steps of the display method as described in any one of claims 9 to 16.
18. The computer device according to claim 17, wherein, include: The memory is configured to store the computer program running on the processor.