Display device and display method

Abstract

The invention provides a display device and a display method, and the display device comprises a display control module, so that when a display module starts a DC dimming mode for display, the display control module adjusts the display control parameters of the display module according to the brightness change data of the display module, thereby adjusting the chromaticity of the display module. The problem that when the display module is in a direct-current dimming mode, the color point of a light-emitting device changes greatly along with the brightness change is solved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display device and a display method. Background Art

[0002] The color gamut standards used by high color gamut display devices include DCI-P3 and Adobe RGB. The color gamut value corresponding to the high color gamut display device containing fluoride phosphor in the light-emitting device can reach 100% DCI-P3 or 100% Adobe RGB. Display devices including blue-green dual-color LED (Light Emitting Diode) chips and 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 greatly with the brightness change, the color deviation is serious at low brightness, and the display will have obvious powdering problems. Summary of the invention

[0003] The embodiments of the present invention provide a display device and a display method, which can improve the problem that the color point of a light emitting device changes with the brightness in a direct current dimming mode.

[0004] An embodiment of the present invention provides a display device, comprising a display module and a display control module electrically connected to the display module. The display control module comprises 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 enables a DC dimming mode for display. The display adjustment unit is electrically connected to the acquisition unit, and the display adjustment unit is configured to adjust the display control parameters of the display module according to the brightness change data to adjust the chromaticity of the display module, and control the display module to display according to the adjusted display control parameters and chromaticity.

[0005] An embodiment of the present invention provides a display method, comprising: when a display module enables a DC dimming mode for display, obtaining 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.

[0006] The present invention provides a display device and a display method. The display device includes a display control module. When the display module enables a DC dimming mode for display, the display control module adjusts the display control parameters of the display module according to the brightness change data of the display module, thereby adjusting the chromaticity of the display module to improve the problem that the color point of the light-emitting device changes greatly with the brightness change in the DC dimming mode of the display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0008] Figure 1 is a schematic diagram of the structure of a display module provided by an embodiment of the present invention;

[0009] Figure 2 is a spectrum comparison diagram provided by an embodiment of the present invention;

[0010] Figure 3 is a schematic diagram of a driving architecture of a display module provided by an embodiment of the present invention;

[0011] Figure 4 is a schematic diagram of the change of color point with the change of brightness provided by an embodiment of the present invention;

[0012] Figure 5A to Figure 5B It is a schematic diagram of the structure of a display device provided by an embodiment of the present invention.

[0013] Figure 6 is a schematic diagram of the color point correction gear division provided by an embodiment of the present invention;

[0014] Figure 7 is a schematic diagram of data voltages corresponding to different color point correction gears provided by an embodiment of the present invention;

[0015] Figure 8 is a schematic diagram of a driving architecture of another display module according to an embodiment of the present invention;

[0016] Fig. 9 is a schematic diagram of a curve showing the relationship between brightness and driving current provided by an embodiment of the present invention;

[0017] Fig.10 is a schematic diagram of a driving architecture of another display module according to an embodiment of the present invention;

[0018] FIG. 11A to FIG. 11D is a flow chart of a display method provided by an embodiment of the present invention;

[0019] Figure 12A to Figure 12B It is a simulation schematic diagram of the display method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the drawings; while "inside" and "outside" refer to the outline of the device.

[0021] Figure 1 1 is a schematic diagram of the structure of a display module provided in an embodiment of the present invention. 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, wherein the passive light-emitting display panel includes a liquid crystal display panel and the like.

[0023] The display panel 10 may include an array substrate 101 and a color film substrate 102 that are arranged opposite to each other. The display panel 10 has liquid crystal molecules disposed between the array substrate 101 and the color film substrate 102. Film layers such as an encapsulation layer 103 may also be disposed on the color film substrate 102. Conductive terminals are disposed on the array substrate 101, and components such as a chip-on-film 104 are connected to the conductive terminals through a medium such as a conductive adhesive 105. One end of the chip-on-film 104 may 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 through a medium such as a colloid.

[0024] The backlight module 20 is disposed on a 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 film layer such as a back plate 106. The backlight module 20 includes a backlight source 201, a light guide plate 202 and other components.

[0025] Optionally, the backlight source 201 includes a light emitting device. The light emitting device may be a monochromatic light emitting device or a multicolor light emitting device. Optionally, the multicolor light emitting device includes a dual-color light emitting device (such as a blue-green dual-color LED chip, etc.). The LED is a light emitting diode (i.e., a 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 realizes multi-color display by controlling the deflection angle of the liquid crystal molecules and cooperating with multiple color film units on the color film substrate 102, the polarizer on the display panel 10, etc.

[0027] For example, the backlight source 201 is a blue-green dual-color LED chip. The backlight source 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 film unit on the color film substrate 102 can include a red color film unit, so that the display module can realize red display through the red color film unit in conjunction with the light emitted by the backlight source 201, the deflection angle of the liquid crystal molecules, the setting of the polarizer, etc. The fluoride phosphor KSF may include potassium fluorosilicate (i.e., KSF) containing tetravalent manganese ions. 2 SiF 6 :Mn 4+ )wait.

[0028] Figure 2 It is a spectrum comparison diagram provided by an embodiment of the present invention. Because the color gamut value corresponding to the high color gamut display device including the light-emitting device using the fluoride-containing phosphor can reach 100% DCI-P3 or 100% Adobe RGB. The 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, in the quantum dot film solution formed by adding quantum dot materials to the light-emitting device, there will be a problem of insufficient reliability, resulting in the problem of bluish peripherals when the display device is displayed. In addition, the solution that can be mass-produced currently still has the problem of cadmium.

[0029] Based on the current end-customer demand for cadmium-free dual-color gamut (i.e. 100% DCI-P3 and 100% Adobe RGB), the green LED chip integrated into the blue-green dual-color LED chip can reduce the half-peak width of the green light spectrum and improve the color gamut (such as Figure 2 As shown in A in the figure), the display device equipped with mass-produced photoresist can meet the requirements of double-hundred color gamut (as shown in Figure 2 As shown in the curve L1 in the figure). However, compared with the KSF 540 solution (such as Figure 2 Unlike the curve L2 in FIG. 1 , the color point of the blue-green dual-color LED chip of the display device that meets the dual-color gamut requirements changes greatly with the decrease in brightness in the DC dimming mode. When the display device displays low brightness, it will cause color deviation and the display will be obviously pink. Although the color deviation of the display device that meets the dual-color gamut requirements is normal in the PWM (Pulse Width Modulation) dimming mode, there is a flicker problem, which reduces the end customer's acceptance of the PWM dimming mode.

[0030] It should be noted that fluoride phosphors can greatly improve the color gamut coverage of display devices. Color gamut coverage refers to the percentage of the area of ​​the triangle enclosed by the coordinate points of the three primary colors of red, green and blue displayed by the display device to the area of ​​the entire CIE color space. Color gamut coverage is the main indicator for measuring the ability of display devices to express the colors of real objects. CIE color space is a color space standard established by the International Commission on Illumination (Commission internationale de l'éclairage, CIE).

[0031] Figure 3 is a schematic diagram of a driving architecture of a display module provided by an embodiment of the present invention, Figure 4 is a schematic diagram of the change of color point with brightness provided by an embodiment of the present invention. Figure 4 LA in the figure indicates that the backlight module 20 does not use a blue-green dual-color LED chip as a backlight source, and the curve of the color point changes with the brightness in the corresponding PWM dimming mode; LB indicates that the backlight module 20 does not use a blue-green dual-color LED chip as a backlight source, and the curve of the color point changes with the brightness in the corresponding DC dimming mode; LC indicates that the backlight module 20 uses a blue-green dual-color LED chip as a backlight source, and the curve of the color point changes with the brightness in the corresponding PWM dimming mode; LD indicates that the backlight module 20 uses a blue-green dual-color LED chip as a backlight source, and the curve of the color point changes with the brightness in the corresponding DC dimming mode. Curves LA to LD all correspond to six brightness nodes, and the six brightness nodes correspond to 100% brightness, 50% brightness, 20% brightness, 10% brightness, 5% brightness, and 2% brightness, respectively.

[0032] Please continue reading Figure 3 and Figure 4 , the light-emitting driver chip 203 converts the received brightness information into a control signal under the DC dimming mode DC to control the green LED chip and the blue LED chip in the blue-green dual-color LED chip to emit light simultaneously. Among them, the brightness information can correspond to the control signal of the PWM dimming mode. However, the driving current corresponding to the green LED chip and the blue LED chip in the DC dimming mode has the same adjustment range, so that when the display brightness of the display device changes from 100% brightness to 1% brightness, the color coordinates Wx and Wy change, such as Figure 3 As shown by the curve LD in FIG. Wx changes by about 0.03, Wy decreases by about 0.07, and the fluctuation range of the color coordinate Wy does not take into account the color point corresponding to 1% brightness. Compared with the display device corresponding to the DC dimming mode and the PWM dimming mode, which does not use the blue-green dual-color LED chip as the backlight source, the color point changes with the brightness change (i.e., the corresponding Figure 3LA and LB in the figure), and the color point changes with the brightness in the PWM dimming mode of the display device corresponding to the backlight module 20 using the blue-green dual-color LED chip as the backlight source (i.e., the corresponding Figure 3 As shown in the curve LC in FIG1 , the color point of a display device in which the backlight module 20 uses a blue-green dual-color LED chip as a backlight source in the DC dimming mode changes more with the brightness. As a result, the display device is prone to obvious pinking during display.

[0033] It should be noted that, in addition to blue-green dual-color LED chips, conventional LED devices also have color points that change with brightness when used in display devices. However, compared with blue-green dual-color LED chips, the range of color point changes of conventional LED devices with brightness changes is relatively small. Therefore, display devices using conventional LED devices may also have display problems caused by the color point of the LED device changing with brightness changes.

[0034] To this end, the present application provides a display device and a display method to improve the problem that the color point of the light-emitting device varies greatly with the brightness change in the DC dimming mode.

[0035] like Figure 5A to Figure 5B is a schematic diagram of the structure of a display device provided by an embodiment of the present invention. The present 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 a plurality of backlight sources configured to provide backlight to the display panel 10. Optionally, the backlight source includes a single-color light emitting device and a dual-color light emitting device, wherein the dual-color light emitting device includes a dual-color LED chip.

[0037] The display module 12 further includes a display control module 30 . The display control module 30 is electrically connected to the display module 12 . The display control module 30 is configured to control the display module 12 to perform 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 brightness change data of the display module 12 when the display module 12 enables the DC dimming mode for display.

[0040] The display adjustment unit 302 is electrically connected to the acquisition unit 301, and is configured to adjust the display control parameters of the display module 12 according to the brightness change data 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 enables the DC dimming mode for display, the chromaticity compensation function is enabled through 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 chromaticity of the display module 12, thereby improving the problem that the color point of the light-emitting device of the display module 12 changes greatly with the brightness change when the display module 12 is in the 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, so as to acquire the brightness change data of the display module 12 through the image signal received by the timing controller and other devices, and adjust the display control parameters through the timing controller, source driver and other devices, and make the display module display according to the adjusted display control parameters and chromaticity through the mutual cooperation of the source driver, gate driver and other devices. Among them, the source driver can output data voltage to multiple sub-pixels.

[0043] Optionally, the display control parameters may include data voltages received by sub-pixels in the display module, driving currents received by light-emitting devices, etc. The light-emitting devices include conventional LED devices, blue-green dual-color LED chips, and the like.

[0044] Accordingly, when the display module 12 enables the DC dimming mode for display, the display control module 30 is configured to adjust the data voltage received by the plurality of sub-pixels or the driving current driving the backlight source to emit light, so as to adjust the chromaticity of the display module 12 .

[0045] When the dimming mode is enabled, the brightness of the display module 12 will change, the color point will change with the change in brightness, and the change in the color point will accumulate over time. Therefore, the color point can be corrected corresponding to different brightness change gears, so that the accumulated deviation from the expected change of the color point can be corrected at intervals of a certain brightness change period, so as to achieve the effect of correcting the color point.

[0046] Accordingly, please continue to refer to Figure 5AThe 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 the first judgment unit 3021 is configured to judge whether the brightness change data is equal to the 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 the plurality of 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 may correspond to a gradual change from 100% brightness to 1% brightness, and the preset brightness value may correspond to at least one of 100% brightness to 1% brightness. For example, the preset brightness value may correspond to at least one of 100% brightness, 50% brightness, 20% brightness, 10% brightness, 5% brightness, and 2% brightness. Accordingly, the color point correction corresponding to the brightness change data may be divided into different levels. For example, Figure 6 This is a schematic diagram of the color point correction gear classification provided by an embodiment of the present invention. Taking the preset brightness values ​​of 100% brightness, 75% brightness, 50% brightness, 20% brightness, 10% brightness, 5% brightness and 2% brightness as an example, the color point correction corresponding to the brightness change data from 100% brightness to 50% brightness is the first gear, the color point correction corresponding to the brightness change data from 50% brightness to 20% brightness is the second gear, the color point correction corresponding to the brightness change data from 20% brightness to 10% brightness is the third gear, the color point correction corresponding to the brightness change data from 10% brightness to 5% brightness is the fourth gear, the color point correction corresponding to the brightness change data from 5% brightness to 2% brightness is the fifth gear, and the color point correction corresponding to the brightness change data from 2% brightness to 1% brightness is the sixth gear.

[0048] It is understandable that the preset brightness value can be set according to actual needs, and the minimum difference between two preset brightness values ​​can be set according to actual needs. For example, the minimum difference between two preset brightness values ​​can be 0.5%.

[0049] Because the amplitude of the color point of the light-emitting device corresponding to the display module 12 displaying low brightness changes with the brightness change is greater than the amplitude of the color point of the light-emitting device corresponding to the display module 12 displaying high brightness changes with the brightness change, therefore, X preset brightness values ​​less than 50% brightness can be set, and Y preset brightness values ​​greater than 50% brightness can be set, X>Y, so that the interval period of correcting the color point corresponding to the display module 12 displaying low brightness is smaller than the interval period of correcting the color point corresponding to the display module 12 displaying high brightness, thereby reducing the difference in the amplitude of the color point changing with the brightness change when the display module 12 displays high brightness and low brightness.

[0050] Since the display brightness of the display module 12 changes over time, the brightness change data of the display module 12 may 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 may be used again to judge whether the brightness change data is equal to the preset brightness value, so as to judge 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 the relationship between the preset brightness value and the data voltage can be pre-stored in a 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, and the memory is used to store the relationship between the preset brightness value and the data voltage.

[0053] Since different data voltages can achieve different brightness displays, the data voltages received by different luminous color sub-pixels may be different. Therefore, the relationship between the preset brightness value and the data voltage may correspond to the relationship between the preset brightness value and the brightness to be displayed of different luminous color sub-pixels, or the relationship between the preset brightness value and the data voltage may correspond to the relationship between the preset brightness value and the display grayscale of different luminous color sub-pixels. If the multiple sub-pixels include a first sub-pixel, a second sub-pixel, and a third sub-pixel, the first sub-pixel, the second sub-pixel, and the third sub-pixel have different luminous colors, and the color point correction corresponding to the brightness change data from 100% brightness to 1% brightness is divided into six levels, the compensation table may be shown in Table 1. Among them, the values ​​corresponding to the first sub-pixel to the third sub-pixel may be the display grayscale or the brightness to be displayed. Accordingly, corresponding to different color point correction levels, the timing corresponding to the data voltage is as follows: Figure 7 shown.

[0054]

[0055]

[0056]

[0057] It should be noted that the data voltage corresponding to the first sub-pixel may be the first data voltage, the data voltage corresponding to the second sub-pixel may be the second data voltage, and the data voltage corresponding to the third sub-pixel may be the third data voltage. Figure 7 The first data voltage may be a data voltage corresponding to a pure red display picture, the second data voltage may be a data voltage corresponding to a pure green display picture, and the third data voltage may be a data voltage corresponding to a pure blue display picture.

[0058] It is understandable that the more color point correction levels there are, the finer the effect of color point correction will be, and the smaller the color point variation range is, the better the color point correction effect will be. Therefore, in actual applications, the number of color point correction levels is set according to actual needs.

[0059] Figure 8 Schematic diagram of another display module driving architecture of an embodiment of the present invention. In the scheme of color point correction, a logic control device such as a timing controller receives an image signal (i.e., a corresponding Figure 8 The timing controller receives the image signal and outputs the control signal, which corresponds 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 the DC dimming mode DC to control the light emitting device to emit light. Whether to call the chromaticity compensation function can be realized by executing the written code by the timing controller and other devices.

[0060] In addition to adjusting the data voltage, the color point can also be corrected from the perspective of the light-emitting device to achieve color point correction from the root. For example, the driving current of the light-emitting device will affect the light-emitting brightness of the light-emitting device, which in turn affects the backlight brightness received by the display panel 10, and further affects the display of the display panel 10. That is, the light-emitting 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 change provided by the backlight module 20 to the display panel 10 when the brightness of the display module 12 needs to be changed.

[0061] Optionally, the backlight module 20 includes a backlight source 201 which is a dual-color light-emitting chip, wherein the dual-color light-emitting chip includes a blue-green LED chip and the like.

[0062] Accordingly, please continue to refer to Figure 5B The display adjustment unit 302 is configured to obtain a driving current ratio of two light-emitting devices driving the dual-color light-emitting chip in the display module 12 according to 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 parameter includes the driving current ratio.

[0063] The brightness variation compensation function can reflect 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 driving current ratio for driving 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.

[0064] Correspondingly, the display adjustment unit 302 is configured to obtain the brightness duty cycle of the two light-emitting devices according to 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.

[0065] Optionally, the brightness variation compensation function may be fitted by a logic control device such as a timing controller, and the brightness variation compensation function may be stored in a memory.

[0066] Optionally, the display adjustment unit 302 may include a calculation unit and a parameter control unit. The calculation unit is configured to obtain a driving current ratio of two light-emitting devices driving the dual-color light-emitting chip in the display module according to 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 control device, and the parameter control unit may be implemented by a backlight driver chip.

[0067] 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 a brightness duty ratio 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 a brightness duty ratio corresponding to the second light-emitting device to drive the second light-emitting device to emit light.

[0068] For example, a blue-green LED chip is used as a dual-color light-emitting chip. Fig. 9 is a schematic diagram of a curve showing the relationship between brightness and driving current provided by an embodiment of the present invention, Fig.10It is a schematic diagram of the driving architecture of another display module 12 of an embodiment of the present invention. Based on the light-emitting principle of the blue-green LED chip, when the fluoride phosphor material is fixed, the current ratio of the green LED chip and the blue LED chip determines the picture chromaticity value of the white display picture of the display module 12. Therefore, the current ratio of the green LED chip and the blue LED chip is different, and the display brightness of the display module 12 is also different. Therefore, based on the analysis based on actual measurement and simulation, the brightness change compensation function B corresponding to the blue LED chip is obtained = 0.0009x^2 + 0.9088x + 0.3147, and the brightness change compensation function G corresponding to the green LED chip is obtained = 0.0011x^2 + 0.8684x + 1.8129. Among them, x and Fig. 9 The x-axis corresponds to the brightness duty cycle of the display module 12, and the y-axis corresponds to the brightness percentage of the green LED chip and the blue LED chip (i.e., the driving current percentage). L3 represents the relationship curve between the brightness of the display module 12 and the driving current corresponding to the blue LED chip, and L4 represents the relationship curve between the brightness of the display module 12 and the driving current corresponding to the green LED chip.

[0069] Please continue reading Fig.10 , when the image signal (i.e. corresponding to PWMI) received by the logic control device (such as the control chip) corresponds to a brightness change requirement, the logic control device will calculate the brightness duty cycle requirement of the green LED chip (i.e. the first light-emitting device) (i.e. corresponding to PWMO_G) and the brightness duty cycle requirement of the blue LED chip (i.e. the second light-emitting device) (i.e. corresponding to PWMO_B) according to the brightness change compensation function, and then the first light-emitting driver chip generates a driving current (i.e. corresponding to DC_G) according to 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 (i.e. corresponding to DC_B) according to the brightness duty cycle of the blue LED chip to drive the blue LED chip to emit light. Among them, the logic control device calculates the brightness duty cycle requirement of the green LED chip according to the written brightness change compensation function.

[0070] In addition, when the display module 12 is in the DC dimming mode, the color shift problem when the display module 12 displays low brightness is more serious than the color shift problem when the display module 12 displays high brightness. Therefore, in order to improve the color shift problem when the display module 12 displays low brightness, a hybrid dimming solution can be used to set the dimming requirements of the display module 12.

[0071] Correspondingly, the display control module also includes a second judgment unit 304, which is electrically connected to the acquisition unit 301, and the second judgment unit 304 is configured to judge whether the brightness duty cycle of the display module 12 is within a first preset range according to the display control data of the display module 12 acquired by the acquisition unit 301. Wherein, when the brightness duty cycle of the display module 12 is within the first preset range, the display module 12 enables the DC dimming mode for display to meet the dimming requirement. When the brightness change of the display module 12 is not within the first preset range, the pulse width modulation dimming mode (i.e., PWM dimming mode) is enabled to meet the dimming requirement.

[0072] The first preset range can be set to the brightness variation range corresponding to when the display module 12 displays 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 preferably set to the brightness variation range corresponding to when the display module 12 enables the DC dimming mode and the display does not have a color shift problem or has a relatively light color shift problem.

[0073] FIG. 11A to FIG. 11D is a flow chart of a display method provided by an embodiment of the present invention. An embodiment of the present invention also provides a display method, which is applied to any of the above-mentioned display devices.

[0074] Please continue reading Fig.11A , the display method comprises:

[0075] When the display module enables the DC dimming mode for display, the brightness change data of the display module is obtained;

[0076] According to 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.

[0077] When the display module enables the DC dimming mode for display, the chromaticity compensation function is enabled to improve the problem that the color point of the light-emitting device varies greatly with the brightness change when the display module is in the DC dimming mode.

[0078] Please continue reading Fig. 11B When setting different brightness change gears to correct the color point, the step of adjusting the display control parameters of the display module according to the brightness change data may include:

[0079] Determine whether the brightness change data is equal to the preset brightness value;

[0080] When the brightness change data is equal to the preset brightness value, the data voltages received by the plurality of sub-pixels in the display module are adjusted according to the relationship between the preset brightness value and the data voltage.

[0081] Optionally, the operation of determining whether the brightness change data is equal to a preset brightness value may be performed by a device such as a timing controller, and the data voltage may be adjusted by a device such as a timing controller and a source driver.

[0082] Please continue reading Fig. 11B , after the step of determining whether the brightness change data is equal to the preset brightness value, it also includes: when the brightness change data is not equal to the preset brightness value, determining whether the brightness change data is equal to the preset brightness value again.

[0083] When the brightness change data is equal to the 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 to correct the color point. Debugging can be performed in advance to obtain and store the relationship between the preset brightness value and the data voltage.

[0084] Accordingly, before the step of adjusting the data voltages received by a plurality of sub-pixels in the display module according to the relationship between the preset brightness value and the data voltage, the step includes:

[0085] When the display module enables the DC dimming mode to display the test picture, the brightness change data of the display module is obtained;

[0086] When the brightness change data is equal to the preset brightness value, determining whether the chromaticity data corresponding to the preset brightness value is equal to the target chromaticity data;

[0087] When the chromaticity data corresponding to the preset brightness value is not equal to the target chromaticity data, adjusting the data voltages received by the plurality of sub-pixels so that the chromaticity data corresponding to the preset brightness value is equal to the target chromaticity data;

[0088] 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 stored in association to obtain the relationship between the preset brightness value and the data voltage.

[0089] The test screen may include a pure red screen, a pure green screen, a pure blue screen, etc. When the display module enables the DC dimming mode to display the test screen, the brightness change data also corresponds to a change from 100% brightness to 1% brightness. The target chromaticity data may be a specification center value. The specification center value may 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 luminous colors of the multiple sub-pixels in the same pixel may be different.

[0090] It should be noted that: the plurality of sub-pixels may correspond to sub-pixels with different luminous colors. For example, the plurality of sub-pixels include a first sub-pixel, a second sub-pixel, and a third sub-pixel, and the luminous colors of the first sub-pixel, the second sub-pixel, and the third sub-pixel are different. It is understandable that the data voltages received by the first sub-pixel, the second sub-pixel, and the third sub-pixel may be set to be different according to the actual display situation.

[0091] Optionally, the light emitting color of the first sub-pixel is red, the light emitting color of the second sub-pixel is green, and the light emitting color of the third sub-pixel is blue.

[0092] Optical devices such as a colorimeter can be used to assist in determining 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 in a device such as a memory.

[0093] For ease of calling, the compensation processes corresponding to different color point correction levels can be integrated into the same control logic, so that when the brightness change data gradually changes from 100% brightness to 1% brightness, the relationship between the preset brightness value and the data voltage corresponding to different color point correction levels can be called according to the change of the brightness data.

[0094] Optionally, the color point correction gear can be set to be greater than or equal to two gears. In order to make the above display method applicable to multiple display modules, the relationship between the preset brightness value and the data voltage can be obtained for multiple display modules, and then the relationship between the preset brightness value and the data voltage corresponding to the multiple display modules is averaged to obtain a display method applicable to multiple display modules. Accordingly, in the scene where the color point of the film material, light guide plate or light-emitting device used in the display module fluctuates, resulting in a large range of color point specifications of the display module, the above display method can also be used to correct the color point.

[0095] In addition, multiple display modules may each have a corresponding preset brightness value and data voltage relationship, and the preset brightness value and data voltage relationship corresponding to each of the multiple display modules may be centrally stored and called individually when needed, so that the above-mentioned display method is suitable for scenes with stricter color point specifications, thereby achieving individual adjustment of each display module.

[0096] Please continue reading Fig. 11C In actual application, the steps of lighting up the display screen of the display panel 10, controlling the chromaticity of the display to meet the design requirements, and not starting the DC dimming mode can be experienced. By collecting tristimulus value data corresponding to different display grayscales of different display images, the collected tristimulus data is analyzed to determine whether to enable the step of adjusting the display control parameters by calling the algorithm interface (i.e., corresponding to Fig. 11Cdll in the memory). After that, the adjusted display control parameters are stored in the storage device, and the color point, brightness and other detection processes (i.e., ΔE control process and optical detection process) are enabled to verify whether the adjusted display control parameters can make the color point meet the requirements. Among them, the storage device can be integrated into the timing controller. Optionally, the storage device is a volatile memory or a non-volatile memory. After the adjusted display control parameters are stored in the storage device, it can be judged whether the data is successfully stored. When it is judged that the data is not successfully stored, the timing controller will be reset, and the steps of controlling the chromaticity of the display to meet the design requirements and the DC dimming mode is not started will be re-executed. When it is judged that the data is successfully stored, the color point, brightness and other detection processes can be entered.

[0097] Please continue reading Fig.11D When the color point is corrected from the perspective of the light-emitting device, the step of adjusting the display control parameters of the display module according to the brightness change data includes:

[0098] According to the brightness change data and a preset brightness change compensation function, a driving current ratio of two light-emitting devices of a dual-color light-emitting chip in a driving display module is obtained;

[0099] The driving currents of the two light-emitting devices driving the dual-color light-emitting chip are adjusted according to the driving current ratio; wherein the display control parameter includes the driving current ratio.

[0100] Optionally, the driving current ratio for driving two light-emitting devices in the dual-color light-emitting chip to emit light can be obtained according to the ratio of the duty cycles of the light-emitting brightness of the two light-emitting devices.

[0101] Correspondingly, 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 according to the brightness change data and the 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 includes:

[0102] The brightness duty ratio of the two light-emitting devices is obtained according to the brightness change data and a preset brightness change compensation function, 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 ratio of the two light-emitting devices.

[0103] In order to obtain the brightness variation compensation function, before obtaining the driving current ratio of the two light emitting devices driving the dual-color light emitting chip in the display module, the method includes:

[0104] Control the display module to display a test picture in the DC dimming mode, and obtain the brightness change data of the display module;

[0105] When the chromaticity data corresponding to the brightness change data is not equal to the target chromaticity data, adjusting 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;

[0106] The driving current ratio corresponding to the target chromaticity data is used as the target current ratio, and a brightness change compensation function is obtained by fitting according to the brightness change data and the target current ratio.

[0107] Optionally, the driving current ratio can be adjusted by cooperating with devices such as a timing controller and a light-emitting driving chip, and a brightness change compensation function can be fitted by a logic control device such as a timing controller.

[0108] In addition, when the hybrid dimming solution is used to implement the setting of the dimming requirement of the display module, before the step of enabling the DC dimming mode for display by the display module, the following steps are included:

[0109] Determining whether the brightness duty cycle of the display module is within a first preset range according to the display control data of the display module;

[0110] When the brightness duty cycle of the display module is within a first preset range, the display module is controlled to enable a DC dimming mode for display.

[0111] The display control data may be an image signal received by a device such as a timing controller, and the image signal may be an image signal to be displayed by a display module.

[0112] Correspondingly, after the step of determining whether the brightness duty cycle of the display module is within a first preset range according to the display control data of the display module, the method further comprises:

[0113] When the brightness duty cycle of the display module is not within the first preset range, the display module is controlled to enable a pulse width modulation dimming mode for display.

[0114] 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 enables the DC dimming mode for display. When the brightness duty cycle of the display module is within the second preset range, the display module enables the PWM dimming mode for display.

[0115] It is understandable that when a new dimming mode is provided, the display module may further be configured with a plurality of preset ranges such as the third preset range to achieve display control of the display module by integrating different dimming modes.

[0116] Figure 12A to Figure 12B : is a simulation schematic diagram of a display method provided by an embodiment of the present invention. Fig. 12AIt is a simulation curve of the color point changing with the brightness obtained by applying the color point correction binning method; Fig. 12B It is a simulation curve of the color point changing with brightness obtained by applying the brightness change compensation function.

[0117] according to Fig. 12A It can be seen that the color point changes with the change in brightness from 100% brightness to 55% brightness. When the brightness change data changes to 55% brightness, the color point will be corrected according to the relationship between the preset brightness value and the data voltage, so that the color point is corrected to a color point close to the color point corresponding to 100% brightness. After that, the brightness change data continues to change, and the color point also changes accordingly, until the brightness change data is equal to another preset brightness value again, the color point is corrected again, and so on, to obtain a simulation curve of the color point changing with brightness. Therefore, the range of variation of the color coordinate Wx is about 0.008. Because when the brightness change data changes to 1% brightness, the brightness expression ability presented by 1% brightness is small, and therefore, the chromaticity corresponding to 1% brightness cannot be clearly perceived by the human eye. Therefore, without considering the color point corresponding to 1% brightness, the fluctuation range of the color coordinate Wy is about 0.02.

[0118] according to Fig. 12B It can be seen that by correcting the color point according to the brightness change compensation function, the variation range of the color coordinate Wx can be changed to about 0.006, and the variation range of the color coordinate Wy can be changed to about 0.008.

[0119] Therefore, according to Fig. 12A and Fig. 12B It can be seen that the display method provided by the present application can improve the problem that the color point of the light-emitting device changes with the brightness in the DC dimming mode. Accordingly, it can improve the problem that the display module has a serious color deviation caused by the color point of the light-emitting device changing with the brightness, and the display appears obvious pink.

[0120] The display device and display method provided by the present application can improve the situation where the color point varies greatly with the brightness. When the end customer uses the display device and adjusts the brightness of the display screen, the degree of color deviation of the display device is reduced.

[0121] In addition, the method of adjusting the driving current and then adjusting the color point will not affect the data voltage received by the sub-pixel, nor will it affect the transmittance of the display module.

[0122] The present 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 implements any of the steps of the above-mentioned display method when executing the computer program.

[0123] The present application also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of any of the above-mentioned display methods are implemented.

[0124] Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A display device, characterized in that: It includes a display module and a display control module electrically connected to the display module; The display control module comprises: an acquisition unit, configured to acquire brightness change data of the display module when the display module enables the DC dimming mode for display; 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 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, characterized in that The display adjustment unit comprises: A first judging unit, electrically connected to the acquiring unit, and configured to judge whether the brightness change data is equal to a preset brightness value; A parameter control unit, electrically connected to the first judgment unit; 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 parameter includes the data voltage.

3. The display device according to claim 1, characterized in that The display adjustment unit is configured to obtain a driving current ratio of two light-emitting devices driving a dual-color light-emitting chip in the display module according to 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, characterized in that: The display adjustment unit is configured to obtain the brightness duty cycle of the two light-emitting devices according to the brightness change data and the preset brightness change compensation function, and adjust the driving current for driving 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, characterized in that: 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, characterized in that: 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 driving chip, configured to generate a first target driving current according to the brightness duty ratio corresponding to the first light-emitting device, so as to drive the first light-emitting device to emit light; and The second light-emitting driving chip is configured to generate a second target driving current according to the brightness duty ratio 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, characterized in that: The display control module also includes: a second judging unit, electrically connected to the acquiring unit, and configured to judge whether the brightness duty cycle of the display module is within a first preset range according to the display control data of the display module acquired by the acquiring unit; Wherein, 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, characterized in that: The display module comprises: A display panel including a plurality of sub-pixels; The backlight module includes a plurality of backlight sources, and the plurality of backlight sources are configured to provide backlight to the display panel.

9. A display method, characterized in that: Used in the display device according to any one of claims 1 to 8, the display method comprises: When the display module enables the DC dimming mode for display, obtaining brightness change data of the display module; According to 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, characterized in that: The step of adjusting the display control parameters of the display module according to the brightness change data includes: Determining whether the brightness change data is equal to a preset brightness value; When the brightness change data is equal to the preset brightness value, the data voltage received by a plurality of 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 parameter includes the data voltage.

11. The display method according to claim 9, characterized in that: The step of adjusting the display control parameters of the display module according to the brightness change data includes: According to the brightness change data and a preset brightness change compensation function, a driving current ratio of two light-emitting devices driving a dual-color light-emitting chip in the display module is obtained; The driving currents of the two light-emitting devices driving the dual-color light-emitting chip are adjusted according to the driving current ratio; wherein the display control parameter includes the driving current ratio.

12. The display method according to claim 9, characterized in that: Before the step of enabling the DC dimming mode for display by the display module, the method includes: Determining whether the brightness duty cycle of the display module is within a first preset range according to the display control data of the display module; When the brightness duty cycle of the display module is within a first preset range, the display module is controlled to enable a DC dimming mode for display.

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