WO2022222969A1 - Procédé de réglage de luminosité pour module de rétroéclairage et dispositif associé - Google Patents

Procédé de réglage de luminosité pour module de rétroéclairage et dispositif associé Download PDF

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Publication number
WO2022222969A1
WO2022222969A1 PCT/CN2022/087986 CN2022087986W WO2022222969A1 WO 2022222969 A1 WO2022222969 A1 WO 2022222969A1 CN 2022087986 W CN2022087986 W CN 2022087986W WO 2022222969 A1 WO2022222969 A1 WO 2022222969A1
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WIPO (PCT)
Prior art keywords
channel
brightness
current
backlight module
gain
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PCT/CN2022/087986
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English (en)
Chinese (zh)
Inventor
张世雄
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华为技术有限公司
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Priority to EP22791075.9A priority Critical patent/EP4310826A1/fr
Publication of WO2022222969A1 publication Critical patent/WO2022222969A1/fr

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the present application relates to the technical field of area dimming, and in particular, to a brightness adjustment method of a backlight module and a related device.
  • liquid crystal displays Because of the advantages of small size, low power consumption, and no radiation, liquid crystal displays (LCDs) occupy an important position in the market.
  • the liquid crystal display includes a liquid crystal display panel and a backlight module, and the backlight module can provide a backlight source for the liquid crystal display panel, so that the liquid crystal display can display a picture.
  • the backlight module can be divided into a plurality of light-emitting areas, and each light-emitting area is provided with at least one light source.
  • the light source can be a light-emitting diode (LED), and the operating current of the light source in each light-emitting area can be controlled by the driving chip. Precise control to achieve the purpose of regional dimming.
  • the luminance linearity of the light source in the backlight module is poor.
  • Embodiments of the present application provide a brightness adjustment method and a related device for a backlight module, so as to improve the brightness linearity of a light source in the backlight module.
  • an embodiment of the present application provides a method for adjusting the brightness of a backlight module.
  • the backlight module may include at least two light sources and at least one driving chip.
  • the backlight module is divided into at least two light-emitting regions, each light-emitting region is provided with at least one light source, and the driving chip includes at least one channel, and the channel is used to provide working current to the light sources in the at least one light-emitting region.
  • the above-mentioned brightness adjustment method may be applied to the above-mentioned driver chip, and the brightness adjustment method may include: obtaining the brightness grayscale value of the light-emitting area corresponding to each channel; and determining the brightness grayscale value corresponding to each channel and the preset threshold value.
  • the dimming mode corresponding to the channel is the current dimming mode, the duty cycle of the working current output by the channel remains unchanged, and the amplitude of the working current output by the channel has a positive correlation with the brightness grayscale value;
  • the dimming mode corresponding to the channel is pulse width modulation (PWM) dimming mode, the amplitude of the working current output by the channel remains unchanged, and the working current output by the channel is The duty cycle is positively correlated with the luminance grayscale value.
  • PWM pulse width modulation
  • the dimming mode corresponding to each channel can be determined, and according to the working current and brightness grayscale of the channel under different dimming modes
  • the corresponding relationship of the order value can determine the amplitude and duty ratio of the working current output by each channel, and can realize the regional dimming of the backlight module.
  • the dimming mode corresponding to the channel is the current adjustment mode, that is, the current adjustment mode is used in low grayscale, and the duty cycle of the working current remains unchanged.
  • Amplitude to adjust the brightness of the backlight module in this way, it can effectively reduce the influence of the rise time and fall time of the working current on the pulse waveform, and can reduce the influence of the parasitic parameters of the wiring, and effectively improve the backlight module under low gray scale.
  • brightness linearity When the brightness grayscale value corresponding to the channel is greater than the preset threshold, the dimming mode corresponding to the channel is the PWM dimming mode, that is, the PWM dimming mode is used under high grayscale, and the amplitude of the working current remains unchanged. By changing the working current the duty cycle to adjust the brightness of the backlight module.
  • the brightness linearity of the backlight module at high gray scales is relatively high, and the PWM dimming mode is adopted at high gray scales, which also reduces the The color stability of the backlight module can be guaranteed. Therefore, the brightness adjustment method provided by the embodiments of the present application can make the brightness linearity of the backlight module in full gray scales higher.
  • the duty cycle of the working current output by the channel is determined as follows: when the dimming mode corresponding to the channel is the current dimming mode, the duty cycle of the working current output by the channel is preset The ratio of the threshold value to the maximum grayscale value of the backlight module; when the dimming mode corresponding to the channel is PWM dimming mode, the duty cycle of the working current output by the channel is the brightness grayscale value corresponding to the channel and the maximum value of the backlight module. The ratio of grayscale values.
  • the duty cycle of the working current is linearly related to the brightness grayscale value.
  • the duty cycle of the working current is 100%, the corresponding brightness grayscale value is the maximum grayscale value of the backlight module.
  • the duty ratio of the working current output by the channel is the ratio of the brightness grayscale value corresponding to the channel to the maximum grayscale value of the backlight module.
  • the maximum grayscale value of the backlight module can be set according to the light-emitting capability of the backlight module. For example, the current maximum grayscale value of the backlight module is 4095, and the specific value of the maximum grayscale value of the backlight module is not calculated here. limited.
  • the duty cycle of the working current remains unchanged with the change of the brightness grayscale value.
  • the duty cycle of the working current is the duty cycle corresponding to the preset threshold Th , that is, the duty cycle of the working current output by the channel is the ratio of the preset threshold to the maximum grayscale value of the backlight module.
  • the amplitude of the working current output by the channel is determined in the following manner: according to the brightness grayscale value corresponding to the channel and the dimming mode, the mixed dimming current gain corresponding to the channel is determined; The mixed dimming current gain corresponding to the channel, and the reference current and global current gain corresponding to the preset driver chip determine the amplitude of the working current output by the channel.
  • the amplitude of the working current increases with the increase of the brightness gray scale value.
  • the amplitude of the working current is a fixed value, that is, in different dimming modes Therefore, in the embodiment of the present application, the parameter of the mixed dimming current gain is used to distinguish the amplitude of the working current and the brightness gray level under different dimming modes. Correspondence of order values. Specifically, the mixed dimming current gain is related to the brightness grayscale value and the dimming mode corresponding to the channel.
  • the hybrid dimming current gain is determined in the following manner: when the dimming mode corresponding to the channel is the current dimming mode, the hybrid dimming current gain is the ratio of the luminance grayscale value to the preset threshold value ; When the dimming mode corresponding to the channel is PWM dimming mode, the mixed dimming current gain is 1.
  • the brightness of different light-emitting areas is adjusted by setting the local current gain corresponding to each channel.
  • determining the amplitude of the working current output by the channel according to the determined mixed dimming current gain corresponding to the channel, as well as the preset reference current and global current gain of the driver chip may include: according to the determined channel corresponding to The mixed dimming current gain of , the reference current and global current gain corresponding to the preset driver chip, and the local current gain corresponding to the preset channel determine the amplitude of the working current output by the channel; the local current gain corresponding to different channels can be Therefore, by setting the local current gain corresponding to the channel, the amplitude of the working current output by the channel can be floated within a certain range, for example, within the range of ⁇ S%, S>0.
  • the local current gain is in the range of 0 to (2 p -1), p is the number of bits occupied by the local current gain, p is a positive integer, and the value of p can be determined according to the specifications of the driver chip, for example, p It can be 6, of course, p can also be other values, which is not limited here.
  • a plurality of registers corresponding to each channel may be set in the driver chip, and the local current gain corresponding to each channel is stored in the corresponding register.
  • the brightness uniformity of each light-emitting area in the backlight module can be improved, so that the liquid crystal display can display the uniformity of the picture in the scene of displaying a solid color picture or a large dynamic video. Better, improve the display effect.
  • the amplitude of the working current output by the channel may conform to the following formula:
  • I ch I ref *Gain 1 *Gain 2 *Gain 3 ;
  • I ch represents the amplitude of the working current output by the channel
  • I ref represents the reference current corresponding to the driver chip
  • Gain 1 represents the global current gain corresponding to the driver chip
  • Gain 2 represents the local current gain corresponding to the channel
  • Gain 3 represents the channel corresponding to The hybrid dimming current gain.
  • the local current gain corresponding to each channel can be determined by the brightness uniformity calibration method of the backlight module.
  • the brightness uniformity calibration method can be performed in the testing process of the backlight module before leaving the factory, and the brightness calibration method can be performed in an external test equipment.
  • the method for calibrating the brightness uniformity of the backlight module in the embodiment of the present application may include: setting the local current gain corresponding to each channel to the same initial value, and powering on the backlight module to light up the each light source; collect the brightness of each light-emitting area in the backlight module; determine whether the brightness uniformity of the backlight module is greater than the first threshold; if so, adjust the local current gain corresponding to each channel; if not, discard the brightness uniformity less than the first threshold.
  • a backlight module with a threshold value after adjusting the local current gain corresponding to each channel, power on the backlight module again to light up each light source in the backlight module; collect the brightness of each light-emitting area in the backlight module; judge Whether the brightness uniformity of the backlight module is greater than the second threshold, and the second threshold is greater than the first threshold; if so, complete the adjustment of the local current gain corresponding to each channel; if not, continue to adjust the local current gain corresponding to each channel.
  • the adjusted local current gain corresponding to each channel is solidified into the non-volatile memory in the driver chip.
  • the driver chip will directly call parameters such as the global current gain and the local current gain corresponding to each channel each time it is powered on.
  • the driver chip only needs to obtain the brightness grayscale value sent by the controller to control the Each channel outputs working current, and the control method is relatively simple.
  • the above-mentioned adjustment of the local current gain corresponding to each channel may include: using the average value of the brightness of each light-emitting area in the backlight module as the target brightness value, and adjusting the local current gain corresponding to each channel according to the target brightness value. current gain.
  • the average value of the brightness of each light-emitting area is used as the target brightness value.
  • the local current gain can be adjusted within the range of ⁇ S%, and the adjustment of the local current gain can be reduced. Therefore, the variation of the amplitude of the working current is reduced, so as to prevent the variation of the working current from being too large, which will cause the color and brightness of the light-emitting area to change too much.
  • an embodiment of the present application further provides a driver chip, the driver chip includes at least one channel, and the channel is used to provide operating current to a light source in at least one light-emitting area in the backlight module.
  • the driver chip provided by the embodiment of the present application may further include: a memory and a processor. Wherein, the memory stores program instructions; the processor is used to call the program instructions stored in the memory, and execute the flow of the above-mentioned brightness adjustment method according to the obtained program, which will not be repeated here.
  • an embodiment of the present application further provides a backlight module
  • the backlight module includes: at least two light-emitting regions, a backlight panel, at least two light sources fixed on the backlight panel, and the above-mentioned driving chip .
  • At least one light source is arranged in each light-emitting area.
  • the driving chip is electrically connected with the backlight panel, and the driving chip includes at least one channel, and the channel is used to provide working current to the light source in at least one light-emitting area.
  • an embodiment of the present application further provides a display device, the display device includes a liquid crystal display panel, and the above-mentioned backlight module, wherein the backlight module is located on the light incident surface side of the liquid crystal display panel.
  • an embodiment of the present application further provides a storage medium, where the storage medium stores computer-executable instructions, where the computer-executable instructions are used to cause a computer to execute the above brightness adjustment method.
  • FIG. 1 is a schematic diagram of the relationship between the working current and the brightness of the duty cycle dimming
  • Fig. 2 is a schematic diagram of the influence of the rise time and the fall time of the working current on the pulse waveform
  • FIG. 3 is a schematic structural diagram of a backlight module in an embodiment of the present application.
  • FIG. 4 is a schematic flowchart of a method for adjusting brightness of a backlight module provided by an embodiment of the present application
  • FIG. 5 is a schematic diagram of the relationship between the working current and the luminance grayscale value in the embodiment of the present application.
  • FIG. 6 is a schematic diagram of another relationship between the working current and the luminance grayscale value in the embodiment of the present application.
  • Fig. 7 is the control schematic diagram of the working current in the embodiment of the application.
  • FIG. 8 is a schematic diagram of a control architecture of working current in an embodiment of the present application.
  • FIG. 9 is a schematic diagram of a working principle of a processor in an embodiment of the present application.
  • FIG. 10 is a schematic flowchart of a method for calibrating brightness uniformity of a backlight module according to an embodiment of the present application
  • FIG. 11 is a schematic diagram showing the comparison of luminance uniformity of the backlight module before and after calibration
  • FIG. 12 is a schematic diagram illustrating the comparison of the luminance linearity of the backlight module of the related art and the embodiment of the present application.
  • 101-backlight board 101-backlight board; 102-light source; 103-driver chip; 1031-processor; 104-controller.
  • the backlight module is mainly used in liquid crystal displays. Since the liquid crystal display panel itself does not emit light, it is necessary to set the backlight module on the side of the light incident surface of the liquid crystal display panel to provide a backlight source for the liquid crystal display panel, so that the liquid crystal display can realize the screen display. .
  • the backlight module is usually divided into at least two light-emitting regions, and each light-emitting region is provided with at least one light source.
  • the brightness of each light-emitting area in the backlight module can be adjusted according to the picture to be displayed, so that the brightness of the brighter area in the display picture is higher, and the brightness of the darker area is darker, so that the display contrast of the liquid crystal display is higher.
  • FIG. 1 is a schematic diagram showing the relationship between the working current and the brightness of the duty cycle dimming.
  • the abscissa in the figure represents the brightness
  • the ordinate represents the operating current of the light source
  • the pulse width of the operating current represents the duty cycle of the operating current.
  • the amplitude of the operating current is constant.
  • the duty cycle of the current is used to adjust the brightness of the light source. The lower the duty cycle of the working current, the lower the brightness, and the higher the duty cycle of the working current, the higher the brightness.
  • Figure 2 is a schematic diagram of the influence of the rise time and fall time of the working current on the pulse waveform.
  • (1) in Figure 2 is the ideal pulse waveform of the working current.
  • (2) is the actual pulse waveform of the working current. Due to the influence of the rising time Tr and the falling time Tf of the working current, the actual pulse waveform of (2) in Figure 2 becomes a trapezoid. Comparing (1) and (2) in Figure 2, it can be clearly seen that the rising time Tr and falling time Tf of the working current will affect the pulse width of the working current, reducing the duty cycle of the working current, thereby affecting the brightness of the light source, This results in poor brightness linearity of the light source.
  • the pulse width of the working current is narrow, and the rise time Tr and the fall time Tf of the working current have more obvious influences on the pulse width, making the brightness linearity of the light source worse at low gray levels.
  • the rise time Tr and the fall time Tf of the working current cannot be avoided.
  • the embodiments of the present application provide a brightness adjustment method and a related device of the backlight module.
  • the backlight module can be applied to a liquid crystal display device, and the backlight module is arranged on the light incident surface side of the liquid crystal display panel to provide a backlight source for the liquid crystal display panel, so that the liquid crystal display device can realize picture display.
  • the terms “installed”, “connected” and “connected” should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements.
  • installed should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements.
  • FIG. 3 is a schematic structural diagram of a backlight module in an embodiment of the present application.
  • the backlight module may be a direct type backlight module.
  • the backlight module may include at least one backlight panel 101 , at least two light sources 102 , at least one driver chip 103 and at least one controller 104 .
  • the backlight module may include one backlight panel 101 , or the backlight module may also include at least two backlight panels 101 spliced with each other.
  • each light source 102 in the backlight module is fixed on the backlight panel 101, and the backlight module is divided into at least two light-emitting regions C, each light-emitting region C is provided with at least one light source 102, and the light source 102 can be a micro light-emitting A diode (mini LED), of course, the light source 102 can also be other types of light-emitting devices, which are not limited here.
  • Each light-emitting area C in the backlight module may be uniformly distributed or non-uniformly distributed, and the light-emitting area C in the backlight module may be divided according to actual needs, which is not limited here.
  • FIG 3 is a partially enlarged schematic diagram of a light-emitting area C.
  • the multiple light sources 102 may be electrically connected in a multi-series and multi-parallel manner.
  • the driver chips 103 in the backlight module are electrically connected to the backlight panel 101 , and the driver chips 103 are sequentially connected in series, and the controller 104 is electrically connected to the driver chips 103 .
  • the driver chip 103 includes at least one channel, such as CH1, CH2, .
  • the controller 104 is used to provide the driving chip 103 with the luminance grayscale value required by each light-emitting area C, and the channel is used to provide the working current to the light source 102 in the corresponding light-emitting area C. In this way, the operating current of the light source 102 in each light-emitting area C is precisely controlled by the driving chip 103, so as to achieve the purpose of regional dimming.
  • FIG. 4 is a schematic flowchart of a method for adjusting brightness of a backlight module provided by an embodiment of the present application. The method can be applied to the system architecture shown in FIG. 3 . As shown in FIG. 4 , the method for adjusting brightness provided by an embodiment of the present application can Applied to any one of the driver chips shown in Figure 3, it specifically includes:
  • FIG. 5 is a schematic diagram of the relationship between the working current and the brightness grayscale value in the embodiment of the application, the abscissa in the figure represents the brightness grayscale value, and the ordinate represents the working current. As shown in FIG.
  • the dimming mode corresponding to the channel is the current dimming mode
  • the duty cycle of the working current output by the channel remains unchanged, and the working current of the channel output remains unchanged.
  • the amplitude of the current is positively correlated with the brightness grayscale value; when the brightness grayscale value corresponding to the channel is greater than the preset threshold Th, the dimming mode corresponding to the channel is the pulse width (PWM) dimming mode.
  • PWM pulse width
  • the dimming mode corresponding to each channel can be determined, and according to the working current and brightness grayscale of the channel under different dimming modes
  • the corresponding relationship of the order value can determine the amplitude and duty ratio of the working current output by each channel, and can realize the regional dimming of the backlight module.
  • the dimming mode corresponding to the channel is the current adjustment mode, that is, the current adjustment mode is used in low grayscale, and the duty cycle of the working current remains unchanged.
  • Amplitude to adjust the brightness of the backlight module in this way, it can effectively reduce the influence of the rise time and fall time of the working current on the pulse waveform, and can reduce the influence of the parasitic parameters of the wiring, and effectively improve the backlight module under low gray scale.
  • brightness linearity When the brightness grayscale value corresponding to the channel is greater than the preset threshold, the dimming mode corresponding to the channel is the PWM dimming mode, that is, the PWM dimming mode is used under high grayscale, and the amplitude of the working current remains unchanged. By changing the working current the duty cycle to adjust the brightness of the backlight module.
  • the brightness linearity of the backlight module at high gray scales is relatively high, and the PWM dimming mode is adopted at high gray scales, which also reduces the The color stability of the backlight module can be guaranteed. Therefore, the brightness adjustment method provided by the embodiments of the present application can make the brightness linearity of the backlight module in full gray scales higher.
  • the luminance grayscale value of the light-emitting area C corresponding to each channel acquired by the driver chip 103 is determined according to the display grayscale value of each area corresponding to the to-be-displayed picture of the screen.
  • the controller 104 can determine the brightness grayscale value required by the light-emitting area corresponding to each channel according to the to-be-displayed image on the screen, and send the determined brightness grayscale value corresponding to each channel to the corresponding driver chip 103 .
  • the backlight module can adjust the brightness according to the picture to be displayed on the screen, so that the brightness of the brighter area is higher and the brightness of the darker area is darker in the display picture after the brightness adjustment, so as to improve the display contrast.
  • the display grayscale value of the picture to be displayed is different from the brightness grayscale value of the backlight module.
  • the display grayscale value of the to-be-displayed picture generally ranges from 0 to 255, and the brightness grayscale value is adopted.
  • the brightness grayscale value of the backlight module generally takes a value in the range of 0 to 4095.
  • the controller 104 can convert the display grayscale value of the to-be-displayed picture into the brightness grayscale required by each light-emitting area in the backlight module according to the corresponding relationship between the display grayscale value of the to-be-displayed picture and the brightness grayscale value of the backlight module. value.
  • the specific value of the preset threshold Th can be determined according to actual needs.
  • the threshold value at which the brightness linearity of the backlight module in the related art is significantly reduced can be used as the preset threshold Th.
  • the preset threshold Th may be 128.
  • the preset threshold may also be other values, which is not limited here.
  • FIG. 6 is a schematic diagram of another relationship between the working current and the luminance grayscale value in the embodiment of the present application.
  • the abscissa represents the luminance grayscale value
  • the ordinate represents the working current.
  • the curve L1 in the figure represents the relationship between the duty cycle of the working current and the brightness grayscale value.
  • the duty cycle of the working current is a fixed value.
  • the duty ratio of the working current is positively correlated with the brightness grayscale value, that is, the duty cycle of the working current increases with the increase of the brightness grayscale value.
  • the curve L2 represents the relationship between the amplitude of the working current and the gray-scale value of brightness.
  • the amplitude of the working current is positively correlated with the gray-scale value of brightness, that is, the amplitude of the working current varies with the gray-scale value of brightness. increases with the increase of , in PWM dimming mode, the amplitude of the working current is a fixed value.
  • the duty ratio of the working current output by the channel can be determined in the following manner:
  • the duty cycle of the working current output by the channel is the ratio of the preset threshold value to the maximum grayscale value of the backlight module
  • the duty ratio of the working current output by the channel is the ratio of the brightness grayscale value corresponding to the channel to the maximum grayscale value of the backlight module.
  • the duty cycle of the working current has a linear relationship with the brightness grayscale value.
  • the duty cycle of the working current is 100%, the corresponding brightness
  • the grayscale value is the maximum grayscale value of the backlight module. Therefore, according to the curve L1, it can be obtained that the duty cycle of the working current output by the channel is the ratio of the brightness grayscale value corresponding to the channel to the maximum grayscale value of the backlight module.
  • the maximum grayscale value of the backlight module can be set according to the light-emitting capability of the backlight module. For example, the current maximum grayscale value of the backlight module is 4095, and the specific value of the maximum grayscale value of the backlight module is not calculated here. limited.
  • the duty cycle of the working current is the duty cycle corresponding to the preset threshold Th , that is, the duty cycle of the working current output by the channel is the ratio of the preset threshold to the maximum grayscale value of the backlight module.
  • the duty cycle of the working current output by the channel can be determined by the following formula:
  • PWM represents the duty ratio of the working current
  • U represents the brightness grayscale value
  • Umax represents the maximum grayscale value of the backlight module.
  • the amplitude of the working current output by the channel may be determined in the following manner:
  • the amplitude of the working current output by the channel is determined.
  • the amplitude of the working current increases with the increase of the brightness grayscale value.
  • the amplitude of the working current is a constant value, that is, It is said that in different dimming modes, the corresponding relationship between the amplitude of the working current and the brightness grayscale value is different. Therefore, in the embodiment of the present application, the parameter of the mixed dimming current gain is used to distinguish the different dimming modes.
  • the corresponding relationship between the amplitude of the working current and the brightness grayscale value. Specifically, the mixed dimming current gain is related to the brightness grayscale value and the dimming mode corresponding to the channel.
  • FIG. 7 is a schematic diagram of the control of the working current in the embodiment of the application.
  • the reference current I ref corresponding to the driver chip can be understood as the current source of the driver chip.
  • the external resistor of the driver chip can be used.
  • the current source can also be set in other ways.
  • the current source can be adjusted by the internal parameters of the chip, or the externally provided current source can also be used.
  • the specific setting method of the current source is not limited here.
  • the global current gain Gain 1 is a global variable, that is, the global current gain Gain 1 corresponding to each channel in the driver chip has the same value.
  • the meaning of the global current gain Gain 1 is to amplify the reference current I ref to adjust the overall brightness of the backlight module, that is to say, the value of the global current gain Gain 1 is greater than 1.
  • the global current gain Gain 1 is 1000, it means that the reference The current I ref is amplified by a factor of 1000.
  • the meaning of the global current gain Gain 1 may also be to reduce the reference current I ref , that is, the value of the global current gain Gain 1 may also be less than 1, which is not limited here.
  • the global current gain Gain 1 can be stored in a register inside the driver chip.
  • the global current gain Gain 1 can occupy m bits, and m is a positive integer.
  • the global current gain Gain can be set according to actual needs. 1 The size of the location occupied is not limited here.
  • Gain 3 in the figure represents the mixed dimming current gain. Since the brightness grayscale values and dimming modes corresponding to different channels may be different, the mixed dimming current gain Gain 3 corresponding to different channels may also be different.
  • the amplitude I ch of the working current output by the channel can be determined, and the amplitude of the working current output by the channel I ch is in the range of 0 ⁇ I max , where I max is the maximum amplitude of the working current, and the maximum amplitude I max of the working current can be determined according to the performance parameters of the light source to prevent the amplitude I ch of the working current output by the channel from exceeding Big burn out the light source.
  • the above-mentioned mixed dimming current gain may be determined in the following manner:
  • the mixed dimming current gain is the ratio of the brightness grayscale value to the preset threshold
  • the mixed dimming current gain is 1.
  • the above-mentioned hybrid dimming current gain can be expressed by the following formula:
  • the amplitude of the working current has a linear relationship with the brightness grayscale value
  • the amplitude of the working current is a constant value.
  • the value of the mixed dimming current gain is different in different dimming modes.
  • the hybrid dimming current gain is the ratio of the luminance grayscale value to the preset threshold, so that the amplitude of the working current and the luminance grayscale value can be linearly related.
  • the hybrid dimming current gain is a fixed value of 1, so that the amplitude of the operating current can be set to a fixed value. Therefore, in the embodiment of the present application, by setting the parameter of the hybrid dimming current gain, the amplitude of the working current output by the channel can meet the trend shown by the curve S2 in FIG. 6 .
  • the brightness of different light-emitting areas is adjusted by setting the local current gain corresponding to each channel.
  • the above-mentioned determination of the amplitude of the working current output by the channel according to the determined mixed dimming current gain corresponding to the channel, as well as the preset reference current and global current gain of the driver chip may include:
  • the amplitude I ch of the working current output by the channel can float within a certain range, for example, it can be within ⁇ S% Floating within the range of S>0.
  • the local current gain Gain 2 is in the range of 0 to (2 p -1), p is the number of bits occupied by the local current gain Gain 2 , p is a positive integer, and the value of p can be determined according to the specifications of the driver chip , for example, p can be 6, of course, p can also be other values, which is not limited here.
  • a plurality of registers corresponding to each channel may be set in the driver chip, and the local current gain Gain 2 corresponding to each channel is stored in the corresponding register respectively.
  • the value range of the local current gain Gain 2 is 0 to (2 p -1), which may correspond to the adjustment range of the amplitude of the working current of 1-S% to 1+S%.
  • the local current gain Gain 2 corresponding to each channel can be determined according to the brightness difference of different light-emitting regions.
  • the brightness uniformity of each light-emitting area in the backlight module can be improved, so that the liquid crystal display can display the uniformity of the picture in the scene of displaying a solid color picture or a large dynamic video. Better, improve the display effect.
  • FIG. 8 is a schematic diagram of the control architecture of the working current in the embodiment of the present application. As shown in FIG. 8 , the amplitude of the working current output by the channel may conform to the following formula:
  • I ch I ref *Gain 1 *Gain 2 *Gain 3 ;
  • I ch represents the amplitude of the working current output by the channel
  • I ref represents the reference current corresponding to the driver chip
  • Gain 1 represents the global current gain corresponding to the driver chip
  • Gain 2 represents the local current gain corresponding to the channel
  • Gain 3 represents the channel corresponding to The hybrid dimming current gain.
  • the reference current I ref and the global current gain Gain 1 are both preset global variables, that is, the reference current I ref corresponding to each channel is the same, and the global current Gain 1 corresponding to each channel is the same gain.
  • the local current gain Gain 2 is a local adjustment variable used to adjust the brightness of different light-emitting regions, and can be determined according to the difference in brightness of different light-emitting regions. Therefore, the local current gain Gain 2 corresponding to different channels may be different.
  • the hybrid dimming current gain Gain 3 is used to distinguish different dimming modes, and is determined by the brightness grayscale value corresponding to the channel and the preset threshold. Therefore, the hybrid dimming current gain Gain 3 corresponding to different channels may also be different.
  • the amplitudes Ich 1 , Ich 2 , ...Ich n of the operating current of each channel can be determined.
  • FIG. 9 is a schematic diagram of the working principle of the processor in this embodiment of the present application.
  • the processor 1031 obtains each channel For the brightness grayscale value required by the corresponding light-emitting area, the processor 1031 calls the global current gain Gain 1 stored in the register and the local current gain Gain 2 corresponding to each channel, and the processor 1031 according to the brightness grayscale value corresponding to each channel and preset Threshold value, determine the dimming mode corresponding to each channel, and then determine the mixed dimming current gain Gain 3 corresponding to each channel, after that, the processor 1031 determines and outputs the duty cycle and amplitude of the operating current corresponding to each channel.
  • the local current gain corresponding to each channel can be determined by the brightness uniformity calibration method of the backlight module.
  • the brightness uniformity calibration method can be performed in the testing process of the backlight module before leaving the factory, and the brightness calibration method can be performed in an external test equipment.
  • Figure 10 is a schematic flowchart of a method for calibrating the brightness uniformity of the backlight module in the embodiment of the application. As shown in Figure 10, the method for calibrating the brightness uniformity of the backlight module in the embodiment of the application may include:
  • the initial value can be 0, of course, the initial value can also be other values, which is not limited here;
  • the backlight module can be photographed by a camera to identify the brightness of each light-emitting area in the backlight module;
  • step S304 determine whether the brightness uniformity of the backlight module is greater than the first threshold a%, a>0; if so, go to step S306; if not, go to step S305; in the embodiment of the present application, by judging the brightness of the backlight module Whether the uniformity is greater than a% can determine whether the brightness uniformity of the backlight module can be calibrated by adjusting the local current gain. If the brightness uniformity of the backlight module is less than a%, the backlight module may be defective, and it is difficult to calibrate by adjusting the local current gain. Therefore, the backlight module with brightness uniformity less than a% is discarded, and the brightness uniformity is greater than a.
  • Adjust the local current gain corresponding to each channel specifically, obtain the average brightness of each light-emitting area in the backlight module, take the average brightness of each light-emitting area in the backlight module as the target brightness value, and adjust each light-emitting area according to the target brightness value. Then, write the adjusted local current gain corresponding to each channel to the non-volatile memory inside the driver chip, and the local current gain corresponding to each channel may be different.
  • the average value of the brightness of each light-emitting area is used as the target brightness value.
  • the local current gain can be adjusted within the range of ⁇ S%, and the adjustment of the local current gain can be reduced. Therefore, the variation of the amplitude of the working current is reduced, so as to prevent the variation of the working current from being too large, which will cause the color and brightness of the light-emitting area to change too much.
  • the backlight module may be photographed by a camera to identify the brightness of each light-emitting area in the backlight module;
  • step S309 Determine whether the brightness uniformity of the backlight module is greater than the second threshold b%, and the second threshold is greater than the first threshold, that is, b%>a%, for example, b can be 95; if so, execute step S310; if not, Then return to step S306; in the embodiment of the present application, after adjusting the local current gain corresponding to each channel, by judging whether the brightness uniformity of the backlight module is greater than b%, it can be determined whether the backlight module meets the brightness uniformity requirement, if If it is satisfied, the brightness uniformity calibration of the backlight module is completed. If it is not satisfied, the local current gain corresponding to each channel is continued until the backlight module meets the brightness uniformity requirements;
  • the adjusted local current gain corresponding to each channel is solidified into the non-volatile memory in the driver chip.
  • the driver chip will directly call parameters such as the global current gain and the local current gain corresponding to each channel each time it is powered on.
  • the driver chip only needs to obtain the brightness grayscale value sent by the controller to control the Each channel outputs working current, and the control method is relatively simple.
  • FIG. 11 is a schematic diagram showing the comparison of brightness uniformity of the backlight module before and after calibration, as shown in Figure 11, (1) in Figure 11 is the brightness data of each light-emitting area in the backlight module before calibration, (2) in Figure 11 is The local current gain corresponding to each channel after adjustment, (3) in FIG. 11 is the brightness data of each light-emitting area in the backlight module after calibration.
  • the brightness uniformity of the backlight module before calibration is about 82.9%.
  • the area enclosed by the dotted line in the figure is the area with poor brightness uniformity.
  • the luminance uniformity of the calibrated backlight module is about 97.2%. It can be proved from FIG. 11 that the brightness adjustment method provided by the embodiment of the present application can better improve the brightness uniformity of the backlight module.
  • FIG. 12 is a schematic diagram showing the comparison of the brightness linearity of the backlight module of the related art and the embodiment of the present application
  • (1) in FIG. 12 is the brightness linearity curve of the backlight module obtained by only adopting PWM dimming in the related art
  • (2) in FIG. 12 is the brightness linearity curve of the backlight module obtained by the hybrid dimming method in the embodiment of the application
  • the abscissa represents the brightness Grayscale value
  • the ordinate represents the brightness value. Comparing (1) and (2) in FIG.
  • the hybrid dimming method is adopted in the embodiment of the present application, and when the luminance grayscale value is less than the preset threshold Th That is, at low gray scale, the brightness linearity of the backlight module is significantly improved, and the hybrid dimming method is adopted in the embodiment of the present application, and the brightness linearity of the backlight module at full gray scale is high.
  • the lower right corner is a schematic diagram of the pulse of the working current in the embodiment of the application, wherein the dotted line represents the ideal waveform of the working current, and the solid line represents the actual waveform of the working current.
  • the difference between the actual waveform of the working current and the ideal waveform in the embodiment of the present application is small. This is because the current adjustment mode is adopted at low gray scales, and the duty cycle of the working current remains unchanged. By changing the amplitude of the working current, the brightness of the backlight module is adjusted, thereby reducing the rise time and fall time of the working current. The impact on the pulse waveform, so the difference between the actual waveform of the working circuit and the ideal waveform is small.
  • the duty cycle adjustment is adopted under high gray scale, and the brightness of the backlight module is adjusted by changing the duty cycle of the working current. At this time, the duty ratio of the working current is large, and the actual waveform of the working current is different from the ideal waveform. The difference is also smaller.
  • an embodiment of the present application also provides a driver chip, the driver chip includes at least one channel, and the channel is used to provide working current to a light source in at least one light-emitting area in the backlight module.
  • the driver chip provided by the embodiment of the present application may further include: a memory and a processor.
  • the memory stores program instructions; the processor is used to call the program instructions stored in the memory, and execute the method flow shown in FIG. 4 or FIG. 10 according to the obtained program, which will not be repeated here.
  • the backlight module may include: at least two light-emitting regions C, a backlight panel 101 , and a panel fixed to the backlight panel 101 .
  • At least two light sources 102 and at least one above-mentioned driver chip 103, each light-emitting area C is provided with at least one light source 102; the driver chip 103 is electrically connected to the backlight panel 101, and the driver chip 103 includes at least one channel, as shown in the figure Among the CH1, CH2, .
  • an embodiment of the present application also provides a display device, the display device includes: a liquid crystal display panel and any one of the above-mentioned backlight modules, the backlight module is located on the side of the light incident surface of the liquid crystal display panel, which is a liquid crystal display panel.
  • the display panel provides a backlight source to enable the display device to display images.
  • the display device can be any device with a display function, such as a TV, a mobile phone, and a tablet computer.
  • an embodiment of the present application further provides a storage medium, where the storage medium stores computer-executable instructions, and the computer-executable instructions are used to make the computer execute any of the brightness adjustment methods shown in FIG. 4 or FIG. 10 above. .
  • the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
  • computer-usable storage media including, but not limited to, disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions
  • the apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.
  • the brightness adjustment mode corresponding to each channel can be determined according to the obtained brightness grayscale value and preset threshold value corresponding to each channel, and according to the brightness corresponding to each channel
  • the gray scale value and dimming mode can determine the amplitude and duty ratio of the working current output by each channel, and realize the regional dimming of the backlight module.
  • the current adjustment mode is adopted at low gray scale, the duty cycle of the working current remains unchanged, and the brightness of the backlight module is adjusted by changing the amplitude of the working current, thus reducing the rise time and fall time of the working current to the pulse.
  • the influence of the parasitic parameters of the wiring is reduced, and the brightness linearity of the backlight module under low gray scale is greatly improved.
  • the PWM dimming mode is adopted at high gray scale, the amplitude of the working current remains unchanged, and the brightness of the backlight module is adjusted by changing the duty cycle of the working current. Since the rise time and fall time of the working current have little influence on the pulse waveform at high gray levels, the brightness linearity of the backlight module at high gray levels is relatively high, and the PWM dimming mode is used at high gray levels to ensure The color stability of the backlight module is improved. Therefore, the brightness adjustment method provided by the embodiments of the present application can make the brightness linearity of the backlight module in full gray scales higher.
  • the brightness uniformity of each light-emitting area in the backlight module can be improved, so that the liquid crystal display can display a solid color picture or a large dynamic video and other scenes.
  • the uniformity is better and the display effect is improved.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)

Abstract

La présente invention concerne un procédé de réglage de luminosité pour un module de rétroéclairage ainsi qu'un dispositif associé. Le procédé de réglage de luminosité comprend les étapes suivantes : acquérir une valeur d'échelle de gris de luminosité d'une région électroluminescente correspondant à chaque canal ; et déterminer, en fonction de la valeur d'échelle de gris de luminosité correspondant à chaque canal et d'un seuil prédéfini, un mode de gradation correspondant à chaque canal, et déterminer, en fonction de la correspondance entre un courant de travail de chaque canal dans différents modes de gradation et la valeur d'échelle de gris de luminosité, l'amplitude et le rapport cyclique du courant de travail délivré par le canal. Selon le procédé de réglage de luminosité fourni dans des modes de réalisation de la présente invention, un mode de réglage de courant est utilisé à une faible échelle de gris, le rapport cyclique du courant de travail demeure inchangé, et la luminosité du module de rétroéclairage est ajustée en modifiant l'amplitude du courant de travail, de telle sorte que l'influence qu'exercent le temps montant et le temps descendant du courant de travail sur la forme d'onde d'impulsion peut être réduite, l'influence de la capacité parasite du câblage peut être réduite, et la linéarité de luminosité du module de rétroéclairage est améliorée.
PCT/CN2022/087986 2021-04-23 2022-04-20 Procédé de réglage de luminosité pour module de rétroéclairage et dispositif associé WO2022222969A1 (fr)

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CN102314841A (zh) * 2010-07-01 2012-01-11 乐金显示有限公司 用于驱动液晶显示设备的装置和方法
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