WO2017088420A1 - 一种区域调光的过驱控制方法及其装置 - Google Patents

一种区域调光的过驱控制方法及其装置 Download PDF

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Publication number
WO2017088420A1
WO2017088420A1 PCT/CN2016/084006 CN2016084006W WO2017088420A1 WO 2017088420 A1 WO2017088420 A1 WO 2017088420A1 CN 2016084006 W CN2016084006 W CN 2016084006W WO 2017088420 A1 WO2017088420 A1 WO 2017088420A1
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output
power consumption
drive current
area
target
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PCT/CN2016/084006
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English (en)
French (fr)
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刘庚
吴肇滨
杨健
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深圳创维－Rgb电子有限公司
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Publication of WO2017088420A1 publication Critical patent/WO2017088420A1/zh

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    • 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
    • G09G3/36—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 using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators

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  • the present invention relates to the field of backlight control technologies, and in particular, to an over-disc control method for regional dimming and a device thereof.
  • Local Dimming technology is a domain adjustment technology that can change the backlight control of the corresponding area according to the different brightness of different areas of the screen.
  • the brighter area of the picture is brighter corresponding to the backlight, and the darker area of the picture is dimmed corresponding to the backlight. .
  • This kind of backlight change is to adjust the image of each frame instantly, which can enhance the image contrast. In the darker picture, the corresponding backlight will be darker, and the picture will become darker, thus enhancing the image contrast.
  • the area dimming technology (ie, domain adjustment technology) divides the liquid crystal display panel into several areas, each area has a corresponding LED backlight, and the brightness of each area is separately driven and controlled.
  • the control terminal collects the image brightness of the picture of the area corresponding to each LED light, and the image brightness outputs a corresponding brightness control signal to drive the corresponding area.
  • the area dimming saves power while effectively improving the contrast of the picture, the black picture will be deeper, and the bright picture will be more transparent.
  • the required driving current per partition is smaller, resulting in a large area of black.
  • an object of the present invention is to provide an over-disc control method and apparatus for area dimming, which can solve the problem that power consumption in a small area of a conventional backlight driving is not bright enough or a large area is bright field. Too high a problem.
  • An over-disc control method for regional dimming which includes
  • the target area is illuminated with the pre-drive current; when the total power consumption of the pre-output is greater than the target power consumption, the target area is illuminated after the pre-drive current is decreased.
  • the step of calculating the pre-drive current value and the pre-output total power consumption according to the image brightness signal specifically includes:
  • the step of illuminating the target area after the pre-driving current is reduced includes:
  • the target area is illuminated with the output drive current.
  • the circuit board includes a main board, a power board, and a constant current board.
  • the method before the step of illuminating the target area with the pre-drive current and lowering the pre-drive current and then illuminating the target area, the method further includes:
  • An area dimming overdrive control device is connected to the backlight module, and includes an image acquisition module, an output control module and a backlight driving module;
  • the image acquisition module collects the brightness signals of each partition image and transmits the signals to the output control module; the output control module calculates the pre-drive current value and the pre-output total power consumption according to the image brightness signal, and compares the pre-output total power consumption with the target power consumption.
  • the output control module controls the backlight driving module to illuminate the target area with the pre-drive current when the total output power consumption of the pre-output is less than the target power consumption; when the total output power consumption of the pre-output is greater than the target power consumption, the output control module reduces the pre-drive current
  • the rear control backlight driving module illuminates the target area.
  • the backlight module includes a plurality of lamp areas; the backlight driving module includes a driving IC for controlling the light area to be turned off, and each driving IC controls a preset lamp. Area.
  • the image acquisition module and the output control module are integrated into a Soc chip, and the SPI interface of the Soc chip and the driver IC corresponding to the lamp region are integrated. Communication connection.
  • the present invention provides an area dimming overdrive control method and apparatus thereof, which collect pre-drive current values and pre-output totals according to the image brightness signals by acquiring image brightness signals of each partition of the image. Power consumption, and compare the total output power of the pre-output with the target power consumption; when the total output power of the pre-output is less than the target power consumption, the target area is illuminated with the pre-drive current; when the total power consumption of the pre-output is greater than the target power consumption, the power is reduced.
  • the target area is illuminated; the drive current of different sizes is selected according to different conditions, which can ensure the overall brightness and control the power consumption of the whole machine, thereby solving the problem that the bright field of the small area in the existing backlight drive is not bright enough or large area
  • the problem of excessive power consumption during bright field further improves the contrast of the liquid crystal display panel display.
  • FIG. 1 is a schematic diagram of area dimming provided by an embodiment of the present invention.
  • FIG. 2 is a flowchart of an overdrive control method for area dimming according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a partitioning of a region dimming according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a Window 20% white field window provided by an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of brightness of a 20% white field of a window according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a brightness of a window 20% white field window of the embodiment of the present invention is 800 nits;
  • FIG. 7 is a structural block diagram of an overdrive control apparatus according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of an overdrive control device according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram showing the partitioning of a small bright block in the upper left corner in the area dimming according to the embodiment of the present invention.
  • the invention provides an over-disc control method for regional dimming and a device thereof, which are suitable for backlight control of a liquid crystal flat panel display.
  • the present invention will be further described in detail below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
  • the backlight of the liquid crystal panel with area dimming is evenly divided into a plurality of areas, such as 1, 2, 3, 4, 5, 6, ..., N areas.
  • V denotes a column
  • H denotes the first zone of the last row
  • N denotes the last zone.
  • the image is usually divided into 0 to 255 gray scales according to 8-bit encoding, where 0x00 corresponds to the all black field, and the luminance is blackest, that is, the gray value is 0, and the values of the three cavities of R, G, and B are all 0. 0xFF corresponds to the full white field.
  • the brightness is the brightest
  • the gray value is 255
  • the values of the R, G, and B chambers are all 255.
  • the light around the small area will be reduced, or the brightness will be reduced, thereby ensuring the darkness of the black scene, which will result in a small area bright scene.
  • the brightness is too low to meet the brightness requirements of small areas. If you want to get more brightness in a small area, you need to open the light circle around it, or increase the brightness of the excessive area, which will cause the brightness of the dark scene to rise, the contrast of the picture will drop, and the picture will feel partial.
  • the embodiment is intended to prevent the dark field from floating up, and the bright field can be highlighted.
  • Advantages when the area dimming enhances the brightness of the bright picture in the small area, while limiting the power consumption when the large area is bright (such as the full white field), the contrast of the picture is more prominent; and the backlight partition is more caused, resulting in the overall power consumption. Big problem.
  • FIG. 2 is a flow chart of a preferred embodiment of the over-disc control method for regional dimming of the present invention.
  • the over-disc control method for the area dimming includes the following steps:
  • the constant current is set to a smaller driving current to illuminate the backlight module.
  • the image brightness signal for each region of the image is then acquired.
  • the specific backlight partition is shown in Figure 3.
  • a total of 240 areas are evenly distributed on the backlight module of the screen.
  • the image luminance signal of each region of the acquired image is an image luminance signal that collects data to be sent to the respective regions displayed on the screen.
  • the image brightness signal is the brightness value of the corresponding area.
  • the area that needs to be lit is the target area.
  • the window 20% white field window shown in Fig. 4 the dotted area indicates the target area, and the bold black body indicates the corresponding area number.
  • the brightness effect corresponding to Figure 4 is shown in Figure 5.
  • the target area corresponds to an all-white area
  • the other areas correspond to all-black areas.
  • the data of the brightness information collected in the 89 area is 0xFF (90 areas, 91 areas, 92 areas, 109 areas, 110 areas, 111 areas, 112 areas) District, 129, 130, 131, 132, 149, 150, 151, 152, etc. are equal to the 89 area)
  • the data of the brightness information collected in other areas (all black) is 0x00.
  • the pre-output value expected to be output to the backlight driving IC is calculated according to the image brightness signal (calculated by the local dimming algorithm, which is a prior art), and the corresponding pre-driving current is calculated from the pre-output value. Value, and then calculate and count the total pre-output power consumption (ie, the power consumption of the pre-output drive) consumed by the backlight module and the circuit board (such as the motherboard, power board, and constant current board) according to the magnitude of the driving current. Comparing the pre-output total power consumption P1 with the target power consumption P2, the ratio P1/P2 of the two can be obtained.
  • the target power consumption is the maximum constant current driving power that the power supply can provide.
  • step S300 when the pre-output total power consumption is less than the target power consumption, that is, the pre-output total power consumption is below the target power consumption, the calculated driving value corresponding to the pre-drive current is directly output to the corresponding constant current.
  • the IC is driven to illuminate the target area.
  • the pre-drive current is decreased, for example, the pre-drive current value is decreased according to the ratio of the target power consumption to the total power consumption of the pre-output, specifically: the target power consumption and the total output power of the pre-output
  • the first ratio is obtained, so that the pre-drive current value (ie, the overall constant current drive value) is calculated according to the calculated first ratio, that is, an output drive current obtained by multiplying the pre-drive current value by the proportional value. value.
  • the drive value corresponding to the output drive current value is sent to the corresponding constant current drive IC to illuminate.
  • FIG. 3 to FIG. 6 This embodiment takes FIG. 3 to FIG. 6 as an example to specifically describe an overdrive control method for area dimming.
  • the instrument emits 20% of the white field of Window.
  • the middle white area shown in Figure 5 represents a small area in the rich dynamic picture.
  • Very high, ie the target area which corresponds to the individual areas within the dashed box in Figure 4. Since the number of lamps that need to be lit is small, the calculated total power consumption of the pre-output is less than the target power consumption.
  • the calculated drive value corresponding to the pre-drive current is directly sent to the constant current drive IC to illuminate 16 zones in the target area.
  • the brightness of the excessive area can be small, so that the transition of the picture can be smooth and uniform, so that the entire dark field will be deeper, and the bright field of the small area is also It is more bright and conspicuous, and the bright picture is more prominent, and the contrast is greatly improved.
  • the full white field represents the maximum power consumption. If all the drive currents are used at the maximum, the power consumption of the whole machine may be high, especially as the partitions become more and more thin. In this case, the power consumption will be larger, and the power requirement is very high. At this time, simply increasing the brightness has not contributed much to the improvement of the picture quality.
  • the total power consumption of the pre-output calculated in this embodiment is greater than the target power consumption, and the ratio P2/P1 of the target power consumption to the total power consumption of the pre-output is 60%, and the output drive current is correspondingly multiplied by 60%. Output.
  • the final driving current is further reduced by the proportional value, thereby playing a power limiting effect, and solving the situation that the power consumption is too high when the large area is bright.
  • the present invention further provides an overdrive control device connected to the backlight module.
  • the overdrive control device includes: an image acquisition module 10, an output control module 20, and a backlight drive module 30.
  • the image acquisition module 10 separately collects image brightness signals corresponding to each partition according to the partitioning condition of the backlight module, and collects the acquired image.
  • the brightness signal is transmitted to the output control module 20.
  • the output control module 20 calculates a pre-drive current value according to the image brightness signal, and calculates a total output power consumption of the backlight module and the circuit board according to the pre-drive current value; when the total output power of the pre-output is less than the target power consumption, the output control The module 20 controls the backlight driving module 30 to illuminate the target area with a pre-drive current. When the pre-output total power consumption is greater than the target power consumption, the output control module 20 lowers the pre-drive current value and controls the backlight driving module 30 to lower the pre-drive current to illuminate the target area.
  • the output control module 20 serially compares the pre-drive current or the reduced pre-drive current according to the order of the partitions of the backlight module and the corresponding relationship between each of the lamp areas and the backlight drive module 30.
  • the drive value is transmitted to the backlight drive module 30.
  • the backlight driving module 30 includes driving ICs (ie, constant current driving ICs), and each driving IC controls the lighting of the corresponding 16 light regions.
  • the corresponding driving IC adjusts the driving output according to the received driving value, controls the magnitude of the output current to reach the value of the constant current or the output driving current, and illuminates the target area with the current, thereby realizing dynamic adjustment according to the brightness of the picture image. Area backlighting.
  • the backlight module includes a plurality of lamp zones, and in this embodiment, 240 lamp zones.
  • Each driver IC controls a preset number of lamp zones (16 in this embodiment), and the types of the driver ICs are different, and the number of the lamp zones controlled is correspondingly changed.
  • the number of driving ICs is determined by the number of lamp zones that can be controlled and the total number of lamp zones of the backlight module.
  • the image acquisition module 10 and the output control module 20 may be integrated into a Soc chip (system level chip), which communicates with the driver IC of the lamp area through the SPI interface.
  • the signals for communication include a chip select signal CS, a master-out slave-in signal SDO, a master-in slave-out signal SDI, a field sync signal Vsync, and an enable signal EN.
  • the master-out slave input signal SDO transmits the drive data and is output by the Soc chip to the driver IC of the lamp zone.
  • the master input/output signal SDI transmits the feedback data of the driver IC and is transmitted back to the Soc chip by the driver IC.
  • the field sync signal Vsync contains one field of transmission data between the two negative pulses, and this signal is generated by the Soc chip according to the video signal.
  • the Soc chip also needs to drive an enable signal EN for the lamp area to drive the IC. Only when the enable signal EN is high, the driver IC can start normal operation. When the driver IC needs to be turned off, it will be enabled. The signal EN is pulled low.
  • the various signals output by the Soc chip directly enter the next stage, that is, the driver IC of the lamp area.
  • the first drive 16 drive control pins are respectively connected to the cathodes of the first to the 16th zones, the second drive 16 drive control legs are respectively connected to the cathodes of the 17th to 32nd zones, and so on, the 15th drive 16 drive
  • the control pins are connected to the cathodes of the 225th to 240th zones; the anodes of the respective zones are connected to the output of the DC/DC module (power supply).
  • the anodes of zones 1 to 16 are connected to the first DC/DC, the anodes of zones 17 to 32 of the module are connected to the second DC/DC module, and so on, and the anodes of zones 225 to 240 are connected to the 15th DC/DC module.
  • a matrix area of 20*12 is formed, as shown in FIG. 3, which is the first area from the upper left corner and the 240th area from the lower right corner.
  • the driver IC can be adjusted to the required drive current value, that is, the brightness of the corresponding lamp area is adjusted.
  • the correspondingly distributed 240 LED lights are displayed as a full white field, that is, the image is a gray value of 255.
  • Soc Chip Soc Chip The drive reaches the maximum.
  • the pre-drive current is 320mA
  • the overall power consumption is 500W and the brightness is 1600nits. At this time, the power consumption of the whole machine is very high.
  • the IC of the constant current plate is also greatly tested, and the temperature rise of the screen back plate and the constant current plate is high. Through testing, it was found that the brightness of 1600nits is too bright for LCD TVs, and it will hurt the eyes for a long time, which also causes great waste of resources. But for the bright field of some small areas in the picture, I hope that it can be brighter.
  • the full white field state belongs to the case where the total output power consumption of the pre-output is greater than the target power consumption.
  • the pre-drive current value is adjusted downward according to the ratio of the target power consumption to the total power consumption of the pre-output, so that each drive current is 220 mA.
  • the brightness requirement is 1000 nits in the full white field state, and the power consumption at this time is 370 W, which does not cause the board to overheat and the brightness does not hurt the eye, so that the performance of the whole machine is optimized.
  • the present embodiment does not exceed the maximum power consumption requirement of the whole machine, does not exceed the specifications of the constant current plate and the backlight module, increases the driving current of the small area, and illuminates the small area with a preset constant current. It can improve the brightness of bright areas in small areas.
  • the power limit controls the power consumption of the whole machine to within 350W, and the pre- The drive current can be 320mA.
  • the maximum brightness can be around 800nits. If there is a relatively small area in the image signal at this time, the brightness of the small area can be made more conspicuous, the layering of the image is higher, and the picture is more transparent and gorgeous.
  • the present invention provides an area dimming overdrive control method and apparatus thereof.
  • a small area is bright, it is determined that the total output power of the pre-output is less than the target power consumption, and the area is provided with a relative Larger driving current to increase the brightness; when a large area of bright field occurs, the total output power consumption of the pre-output is greater than the target power consumption.
  • the driving current of the backlight area By lowering the driving current of the backlight area, the overall brightness can be ensured, and the power consumption of the whole machine can be controlled.

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Abstract

一种区域调光的过驱控制方法及装置。区域调光的过驱控制方法包括：上电时初始化，采集图像各分区的图像亮度信号（S100）；根据图像亮度信号计算预驱动电流值和预输出总功耗，并比较预输出总功耗与目标功耗的大小（S200）；当预输出总功耗小于目标功耗时，以预驱动电流点亮目标区域；当预输出总功耗大于目标功耗时，降低预驱动电流后点亮目标区域（S300）。根据不同情况选择不同大小的驱动电流，既能保证整体的亮度，特别是对小区域的亮场景的亮度的贡献突出，又能控制整机功耗，从而解决了现有背光驱动中小区域亮场景不够亮或者大区域亮场景功耗过高的问题，进一步改善了液晶显示面板显示的对比度。

Description

一种区域调光的过驱控制方法及其装置 技术领域
本发明涉及背光控制技术领域，尤其涉及一种区域调光的过驱控制方法及其装置。
背景技术
Local Dimming技术即域调节技术，能根据画面不同区域的不同亮度，去改变对应区域的背光控制，画面比较亮的区域，对应背光灯就调亮，画面比较暗的区域，对应背光灯就调暗。这种背光的改变是每帧画面即时去调整，能够增强图像对比度，在比较暗画面，对应背光会变暗，这样画面就会变得更暗，从而加强图像对比度。
区域调光技术(即域调节技术)会将液晶显示平板分成若干个区域，每个区域有对应的LED背光源，每个区域的亮度都单独去驱动控制。控制端会采集每颗LED灯对应的区域的画面的图像亮度，该图像亮度输出相应的亮度控制信号去驱动对应的区域。相对于传统背方式而言，区域调光节省功耗的同时能有效提升画面的对比度，黑画面会更加深邃，亮画面会更加通透。但是由于目前分区越来越细，背光区域的灯粒越来越多，对此，要达到一个较高的亮度，所需的每个分区的驱动电流就更小，导致在大面积黑中部分小区域的亮点就会亮不起来或亮度不明显。也不能发挥出每颗灯的高亮效果。而且，周围的过度区域或暗场景也不能形成更强的对比，但是如果整体提升背光 驱动的预驱动电流，不仅会牺牲一些对比度，而且会造成整体功耗很大。
因此，现有技术还有待于改进和发展。
发明内容
鉴于上述现有技术的不足之处，本发明的目的在于提供一种区域调光的过驱控制方法及其装置，以解决现有背光驱动中小区域亮场不够亮或者大区域亮场时功耗过高的问题。
为了达到上述目的，本发明采取了以下技术方案：
一种区域调光的过驱控制方法，其包括
上电时初始化，采集图像各分区的图像亮度信号；
根据所述图像亮度信号计算预驱动电流值和预输出总功耗，并比较预输出总功耗与目标功耗的大小；
当预输出总功耗小于目标功耗时,以预驱动电流点亮目标区域；当预输出总功耗大于目标功耗时，降低预驱动电流后点亮目标区域。
所述的区域调光的过驱控制方法中，所述根据所述图像亮度信号计算预驱动电流值和预输出总功耗的步骤具体包括：
根据图像亮度信号先计算出预计输出给驱动IC的预输出数值；
根据预输出数值计算其所对应的预驱动电流值；
根据预驱动电流值计算背光模组和电路板消耗的预输出总功耗。
所述的区域调光的过驱控制方法中，所述降低预驱动电流后点亮目标区域的步骤具体包括：
计算目标功耗与预输出总功耗的第一比值；
将所述预驱动电流乘以第一比值获得输出驱动电流；
以输出驱动电流点亮目标区域。
所述的区域调光的过驱控制方法中，所述电路板包括主板、电源板、恒流板。
所述的区域调光的过驱控制方法中，所述以预驱动电流点亮目标区域，降低预驱动电流后点亮目标区域的步骤之前，还包括：
对输出的预驱动电流值或降低的预驱动电流值进行校验，校验正确则点亮目标区域并进入下一次的图像亮度信号采集，校验错误则请求重新发送。
一种区域调光的过驱控制装置，与背光模组连接，其包括图像采集模块、输出控制模块和背光驱动模块；
所述图像采集模块采集各分区图像亮度信号并传给输出控制模块；输出控制模块根据所述图像亮度信号计算预驱动电流值和预输出总功耗，并比较预输出总功耗与目标功耗的大小；当预输出总功耗小于目标功耗时，输出控制模块控制背光驱动模块以预驱动电流点亮目标区域；当预输出总功耗大于目标功耗时，输出控制模块降低预驱动电流后控制背光驱动模块点亮目标区域。
所述的区域调光的过驱控制装置中，所述背光模组包括若干个灯区；所述背光驱动模块包括用于控制灯区亮灭的驱动IC，每个驱动IC控制预设个灯区。
所述的区域调光的过驱控制装置中，所述图像采集模块、输出控制模块集成为Soc芯片，Soc芯片的SPI接口与灯区对应的驱动IC 通信连接。
相较于现有技术，本发明提供的一种区域调光的过驱控制方法及其装置，通过采集图像各分区的图像亮度信号，根据所述图像亮度信号计算预驱动电流值和预输出总功耗，并比较预输出总功耗与目标功耗的大小；当预输出总功耗小于目标功耗时以预驱动电流点亮目标区域；当预输出总功耗大于目标功耗时，降低预驱动电流后点亮目标区域；根据不同情况选择不同大小的驱动电流，既能保证整体的亮度，又能控制整机功耗，从而解决了现有背光驱动中小区域亮场不够亮或者大区域亮场时功耗过高的问题，进一步改善了液晶显示面板显示的对比度。
附图说明
图1是本发明实施例提供的区域调光示意图；
图2是本发明实施例提供的区域调光的过驱控制方法流程图；
图3是本发明实施例提供的区域调光的分区示意图；
图4是本发明实施例提供的Window 20％的白场窗口示意图；
图5是本发明实施例提供的Window 20％的白场的亮度示意图；
图6是本发明实施例提供的Window 20％的白场窗口的亮度为800nits的示意图；
图7是本发明实施例提供的过驱控制装置的结构框图；
图8是本发明实施例提供的过驱控制装置的示意图；
图9是本发明实施例提供的区域调光中左上角小亮块的分区示意图。
具体实施方式
本发明提供了一种区域调光的过驱控制方法及其装置，适用于液晶平板显示屏的背光控制。为使本发明的目的、技术方案及优点更加清楚、明确，以下参照附图并举实施例对本发明进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
如图1所示，带区域调光的液晶面板的背光按照行列方式均匀地分成若干个区，如1、2、3、4、5、6、……、N区。图1中V表示列，H表示最后一行的第一个区，N表示最后一个区。这些区是否点亮以及亮度值都与该区对应的图像变化和图像亮度关联，随着图像的亮度、移动方向，对应区也会在亮度上变化，方向也随着图像变，即驱动电流在变化。目前通常将图像按8比特编码分成0到255灰阶，其中0x00对应全黑场，此时亮度为最黑，即灰度值为0，其R、G、B三腔的值均为0。0xFF对应全白场，此时亮度为最亮，灰度值为255，其R、G、B三腔的值均为255。
为了达到local dimming效果，按照传统local dimming的做法，在小区域亮场的情况下，会将小区域周围的灯减少，或者亮度降低，从而保证黑场景的暗，这样将造成小区域亮场景的亮度偏低，不能达到小区域的亮度要求。如果小区域要获得更大的亮度，需要将其周围的灯圈开得更大，或者过度区域的亮度加大，这样又会造成暗场景的亮度抬升，画面对比度下降，画面会感觉偏蒙。
此为，本实施例旨在让暗场不要浮起来，亮场能够发挥出高亮的 优势；区域调光时提升小区域中的亮画面的亮度，同时在大面积亮时(如全白场)限制功耗，更加突出画面的对比度；并能解决背光分区较多导致整体功耗过大的问题。请参阅图2，其为本发明区域调光的过驱控制方法的较佳实施例的流程图。所述区域调光的过驱控制方法包括以下步骤：
S100、上电时初始化，采集图像各分区的图像亮度信号；
S200、根据所述图像亮度信号计算预驱动电流值和预输出总功耗，并比较预输出总功耗与目标功耗的大小；
S300、当预输出总功耗小于目标功耗时，以预驱动电流点亮目标区域；当预输出总功耗大于目标功耗时，降低预驱动电流后点亮目标区域。
本实施例中，初始化时，将恒流电流设置为一个较小的驱动电流来点亮背光模组。之后采集图像各区域的图像亮度信号。具体的背光分区如图3所示，共240个区，均匀地分布在屏的背光模组上。采集图像各区域的图像亮度信号即是采集将要送到屏上显示的各个区的数据的图像亮度信号。所述图像亮度信号即对应区域的亮度值。本实施例中，需要点亮的区域为目标区域。图4所示的Window 20％的白场窗口，虚线框内表示目标区域，粗黑体表示对应的区号。图4对应的亮度效果如图5所示。如目标区域对应为一个全白区域，其他区域对应是全黑的区域，89区采集到的亮度信息的数据为0xFF(90区、91区、92区、109区、110区、111区、112区、129区、130区、131区、132区、149区、150区、151区、152区、等数据与89区相等)， 其他区(全黑)采集到的亮度信息的数据为0x00。
在所述步骤S200中，根据图像亮度信号先计算(采用local dimming算法计算，此为现有技术)出预计输出给背光驱动IC的预输出数值，由预输出数值计算其所对应的预驱动电流值，然后根据驱动电流的大小，计算并统计背光模组和电路板(如主板、电源板、恒流板)消耗的预输出总功耗(即预输出驱动的整机功耗)。将预输出总功耗P1与目标功耗P2做比较，即可获得两者的比值P1/P2。所述目标功耗即电源所能提供的最大恒流驱动功耗。
在所述步骤S300中，当预输出总功耗小于目标功耗时，即预输出总功耗在目标功耗之下，则直接输出计算出的预驱动电流对应的驱动数值给对应的恒流驱动IC来点亮目标区域。当预输出总功耗大于目标功耗时，则降低预驱动电流，如根据目标功耗与预输出总功耗的比值来降低预驱动电流值，具体为：将目标功耗与预输出总功耗相比获得第一比值，从而将预驱动电流值(即整体的恒流驱动值)按计算的第一比值往计算驱动电流，即将预驱动电流值与比例值相乘得到的一输出驱动电流值。将输出驱动电流值对应的驱动数值发送到对应的恒流驱动IC来点亮。
在具体实施时，为了驱动数据正确传输到驱动端，还需对输出的预驱动电流或输出驱动电流值对应的传输数据进行校验并反馈结果。若校验正确则点亮目标区域并进入下一次的图像亮度信号采集并显示图像信号，如果校验错误则请求重新发送。
本实施例以图3至图6为例，具体阐述区域调光的过驱控制方法。 如图4和图5所示，用仪器发出Window 20％的白场，对于一个小区域的图像亮点，图5所示的中间的白色区域代表了在丰富的动态画面中有一个小区域需亮度很高，即目标区域，其对应为图4中虚线框内的各个区。由于需要点亮的灯较少，则计算出的预输出总功耗小于目标功耗。此时直接将计算出的预驱动电流对应的驱动数值发送给恒流驱动IC以点亮目标区域中的16个区。此时只需点亮最少的灯即可达到想要的亮度，而过度区的亮度也可以较小，保证画面过渡流畅均匀就可以，这样整个暗场就会更加深邃，小区域的亮场也更加光亮显眼且亮画面更加的突出，对比度得到很大程度的提高。
而全白场代表了消耗功率的最大值，如果此时将所有的驱动电流都用到最大，那么可能导致整机的功耗很高，特别随着分区越来越多，越来越细的情况下，功耗会更大，对电源要求非常高，此时单纯地提高更多的亮度对画质提高已经没有足够大的贡献。
全白场时本实施例计算出的预输出总功耗大于目标功耗，目标功耗与预输出总功耗的比值P2/P1为60％，输出驱动电流都对应地乘以60％后再输出。这样根据当前的总功耗和目标功耗作比后按比例值进一步下调最终的驱动电流，从而起到了功率限制作用，解决了大区域亮场时功耗过高的情况。
基于上述实施例，本发明还提供一种过驱控制装置，与背光模组连接，如图7所示，所述过驱控制装置包括；图像采集模块10、输出控制模块20和背光驱动模块30。图像采集模块10根据背光模组的分区情况，分别采集每个分区对应的图像亮度信号，将采集到的图 像亮度信号传给输出控制模块20。输出控制模块20根据所述图像亮度信号计算预驱动电流值，根据预驱动电流值计算背光模组和电路板消耗的预输出总功耗；当预输出总功耗小于目标功耗时，输出控制模块20控制背光驱动模块30以预驱动电流点亮目标区域。当预输出总功耗大于目标功耗时，输出控制模块20降低预驱动电流值，并控制背光驱动模块30以降低后的预驱动电流点亮目标区域。
本实施例中，所述输出控制模块20根据背光模组各个分区的排序、和每个灯区与背光驱动模块30的对应关系，串行的将预驱动电流或降低后的预驱动电流对应的驱动数值传输给背光驱动模块30。背光驱动模块30包括驱动IC(即恒流驱动IC)，每个驱动IC控制对应的16个灯区的亮灭。对应的驱动IC根据接收到的驱动数值调整驱动输出，控制输出的电流的大小以达到恒流电流或输出驱动电流的值，以该电流点亮目标区域，从而实现了根据画面图像的亮度动态调整区域背光。
所述背光模组包括若干个灯区，本实施例中为240个灯区。每个驱动IC控制预设个灯区(本实施例为16个)，驱动IC的型号不同，所控制的灯区个数对应更改。驱动IC的个数由其能控制的灯区和背光模组的总灯区个数决定。
在具体实施时，可将图像采集模块10、输出控制模块20集成为Soc芯片(***级芯片)，其通过SPI接口与灯区的驱动IC通信。如图8所示，通信的信号包括片选信号CS、主出从入信号SDO、主入从出信号SDI、场同步信号Vsync和使能信号EN。
当片选信号CS为低电平时，数据才能有效地从Soc芯片传到驱动IC。主出从入信号SDO，传输驱动数据，由Soc芯片输出到灯区的驱动IC。主入从出信号SDI，传输驱动IC的反馈数据，由驱动IC回传给Soc芯片。场同步信号Vsync，两个负脉冲之间包含一场传输数据，此信号由Soc芯片根据视频信号产生。Soc芯片还需要给灯区驱动一个使能信号EN，用于驱动IC的使能，只有在使能信号EN为高电平时，那么驱动IC才能开始正常工作，需要关闭驱动IC时，将使能信号EN拉低即可。
Soc芯片输出的各种信号直接进入下一级，即灯区的驱动IC。所述驱动IC共有15颗，每一颗能够驱动16个区，每个区相当于一个发光LED灯。其中第1驱动的16路驱动控制脚分别接第1到16区的阴极，第2驱动的16路驱动控制脚分别接第17到32区的阴极，以此类推，第15驱动的16路驱动控制脚分别接第225到240区的阴极；各个区的阳极连接到DC/DC模块(供电)的输出上。其中第1到16区的阳极连到第1DC/DC,模块第17到32区的阳极连到第2DC/DC模块，以此类推，第225到240区的阳极连到第15DC/DC模块，如此构成了20*12的矩阵区域，如图3所示,其从左上角开始为第1区，右下角为第240区。
驱动IC通过调整输出占空比，即可调整至需要的驱动电流值，也即实现了调整对应灯区区的亮度。在240个灯区的背光模组中，对应均匀分布240个LED灯当显示为全白场时，即图像为255的灰度值，如果采用传统方式，这个240个灯区达到最大亮度，Soc芯片的 驱动达到最大，若预驱动电流为320mA，整体功耗为500W，亮度为1600nits。此时整机的功耗非常高，同时达到此电流值时，恒流板的IC也受到极大的考验，屏背板和恒流板温升都会很高。通过测试发现，1600nits的亮度对于液晶电视太亮，长时间看会伤害到眼睛，也造成了资源的极大浪费。但是对于画面中的一些小区域的亮场，又希望其能够亮一些。
全白场状态属于预输出总功耗大于目标功耗的情况，本实施例将预驱动电流值按目标功耗与预输出总功耗的比例值往下调驱动电流，使每路驱动电流为220mA，则全白场状态下亮度要求1000nits，此时的功耗为370W，不会使板过热且亮度不伤眼，使整机性能达到最佳。
当遇见较小区域的亮，如图4所示。若只点亮Window 20％图像下对应的灯区，图像中只有Window 20％显示为全白，即灰度值为255，其他地方为全黑，灰度值为0，其属于预输出总功耗小于目标功耗的情况。预驱动电流值为220mA，此时的亮度为550nits，此时的亮度在整机最大亮度为1000nits的状态下播放动态画面则小区域的亮场景效果较差。Window 20％的亮度建议能接近800nits或更高是一个理想的选择。若点更多的灯(如图6黑粗线框以内、虚线框以外的灯区)，此时最大的驱动电流仍是220mA，在画面全黑的地方就会出现有微微的漏光，画面变蒙，图像的层次感黑对比度较差。对此，本实施例在不超过整机最大功耗要求，不超过恒流板和背光模组规格的前提下，提高小区域的驱动电流，以预设的恒流电流来点亮小区域，可提高小区域亮场的亮度。并且功率限制将整机功耗控制为350W以内，而预 驱动电流却可以做320mA，当Window 20％窗口为全白时，最大亮度可以到800nits左右。若此时在图像信号中有比较亮的小区域时，能够让小区域的亮度更加显眼，图像的层次感也更高，画面更加的通透和艳丽。
再比如图9中，在左上角有一个小两块对应一个太阳的区域，对那么此时在图像为一个太阳的区域，对应22区，23区，42区和43区，而其他区域是亮度较低的高楼遮挡区域。将22区，23区，42区和43区的驱动电流提到最大，亮度值就可以很高，而高楼遮挡区域和太阳形成强烈的对比，整个画面的层次感就提高，太阳会看上去会非常通透。
综上所述，本发明所提供的一种区域调光的过驱控制方法及其装置，在某个小区域很亮时，判断预输出总功耗小于目标功耗，则对该区域提供相对较大的驱动电流以提高亮度；出现大区域的亮场时，预输出总功耗大于目标功耗，通过下调背光区域的驱动电流，既能保证整体的亮度，又能控制整机功耗，从而解决了现有背光驱动中小区域亮场不够亮或者大区域亮场时功耗过高的问题，进一步改善了液晶显示面板显示的对比度，能显示更深邃的黑，更显眼的亮。
应当理解的是，本发明的应用不限于上述的举例，对本领域普通技术人员来说，可以根据上述说明加以改进或变换，所有这些改进和变换都应属于本发明所附权利要求的保护范围。

Claims (12)

  1. 一种区域调光的过驱控制方法，其特征在于，包括如下步骤：
    上电时初始化，采集图像各分区的图像亮度信号；
    根据所述图像亮度信号计算预驱动电流值和预输出总功耗，并比较预输出总功耗与目标功耗的大小；
    当预输出总功耗小于目标功耗时，以预驱动电流点亮目标区域；当预输出总功耗大于目标功耗时，降低预驱动电流后点亮目标区域。
  2. 根据权利要求1所述的区域调光的过驱控制方法，其特征在于，所述根据所述图像亮度信号计算预驱动电流值和预输出总功耗的步骤具体包括：
    根据图像亮度信号先计算出预计输出给驱动IC的预输出数值；
    根据预输出数值计算其所对应的预驱动电流值；
    根据预驱动电流值计算背光模组和电路板消耗的预输出总功耗。
  3. 根据权利要求1所述的区域调光的过驱控制方法，其特征在于，所述降低预驱动电流后点亮目标区域的步骤具体包括：
    计算目标功耗与预输出总功耗的第一比值；
    将所述预驱动电流乘以第一比值获得输出驱动电流；
    以输出驱动电流点亮目标区域。
  4. 根据权利要求2所述的区域调光的过驱控制方法，其特征在于，所述电路板包括主板、电源板、恒流板。
  5. 根据权利要求1所述的区域调光的过驱控制方法，其特征在 于，所述以预驱动电流点亮目标区域，降低预驱动电流后点亮目标区域的步骤之前，还包括：
    对输出的预驱动电流值或降低的预驱动电流值进行校验，校验正确则点亮目标区域并进入下一次的图像亮度信号采集，校验错误则请求重新发送。
  6. 一种区域调光的过驱控制装置，与背光模组连接，其特征在于，包括图像采集模块、输出控制模块和背光驱动模块；
    所述图像采集模块采集各分区图像亮度信号并传给输出控制模块；输出控制模块根据所述图像亮度信号计算预驱动电流值和预输出总功耗，并比较预输出总功耗与目标功耗的大小；当预输出总功耗小于目标功耗时，输出控制模块控制背光驱动模块以预驱动电流点亮目标区域；当预输出总功耗大于目标功耗时，输出控制模块降低预驱动电流后控制背光驱动模块点亮目标区域。
  7. 根据权利要求6所述的区域调光的过驱控制装置，其特征在于，所述输出控制模块根据所述图像亮度信号计算预驱动电流值和预输出总功耗具体包括：
    输出控制模块根据预输出数值计算其所对应的预驱动电流值；
    根据预驱动电流值计算背光模组和电路板消耗的预输出总功耗；
    比较预输出总功耗与目标功耗的大小。
  8. 根据权利要求6所述的区域调光的过驱控制装置，其特征在于，所述输出控制模块降低预驱动电流后控制背光驱动模块点亮目标区域具体包括：
    输出控制模块计算目标功耗与预输出总功耗的第一比值；
    将所述预驱动电流乘以第一比值获得输出驱动电流；
    以输出驱动电流控制背光驱动模块点亮目标区域。
  9. 根据权利要求7所述的区域调光的过驱控制装置，其特征在于，所述电路板包括主板、电源板、恒流板。
  10. 根据权利要求6所述的区域调光的过驱控制装置，其特征在于，所述输出控制模块降低预驱动电流后控制背光驱动模块点亮目标区域之前还包括：
    对输出的预驱动电流值或降低的预驱动电流值进行校验，校验正确则点亮目标区域并进入下一次的图像亮度信号采集，校验错误则请求重新发送。
  11. 根据权利要求6所述的区域调光的过驱控制装置，其特征在于，所述背光模组包括若干个灯区；所述背光驱动模块包括用于控制灯区亮灭的驱动IC，每个驱动IC控制预设个灯区。
  12. 根据权利要求11所述的区域调光的过驱控制装置，其特征在于，所述图像采集模块、输出控制模块集成为Soc芯片，Soc芯片的SPI接口与灯区对应的驱动IC通信连接。
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115862553A (zh) * 2022-12-08 2023-03-28 四川长虹电器股份有限公司 一种多分区背光***液晶电视功率限定的方法

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105390096A (zh) * 2015-11-24 2016-03-09 深圳创维－Rgb电子有限公司 一种区域调光的过驱控制方法及其装置
CN105575343B (zh) * 2016-03-25 2018-04-20 京东方科技集团股份有限公司 背光控制方法和背光模组、显示装置
CN107666576A (zh) * 2016-07-29 2018-02-06 四川长虹电器股份有限公司 一种液晶电视背光控制的方法和装置
CN106101594B (zh) * 2016-08-04 2019-03-12 深圳创维－Rgb电子有限公司 Hdr电视机及区域调光方法
CN106448570A (zh) * 2016-09-14 2017-02-22 深圳创维－Rgb电子有限公司 一种高功率区域调光控制方法、控制装置及电视机
CN106128372A (zh) * 2016-09-14 2016-11-16 广州创维平面显示科技有限公司 一种直下式背光源的控制方法、控制***和液晶电视
CN108039152B (zh) * 2017-12-14 2020-11-13 深圳Tcl新技术有限公司 背光驱动控制方法、设备及计算机可读存储介质
CN108182912B (zh) * 2018-02-07 2020-07-10 深圳创维－Rgb电子有限公司 调整背光亮度的方法、装置、设备和存储介质
CN108766364B (zh) 2018-05-18 2020-07-07 京东方科技集团股份有限公司 图像显示处理方法及装置、显示装置及存储介质
CN109949752B (zh) * 2019-04-03 2020-11-24 深圳康佳电子科技有限公司 一种区域显示亮度调节方法、播放终端及存储介质
TWI696987B (zh) * 2019-04-18 2020-06-21 友達光電股份有限公司 顯示裝置與其背光驅動方法
CN110149749B (zh) * 2019-05-20 2024-02-09 上海光联照明有限公司 一种led灯具总功率控制***和方法
CN113568474A (zh) * 2020-04-29 2021-10-29 华硕电脑股份有限公司 电子装置及其温度调整方法
CN112233627B (zh) 2020-12-14 2021-04-20 北京显芯科技有限公司 背光电路的控制方法、背光电路以及lcd显示屏
CN112947734B (zh) * 2021-03-04 2022-05-13 山东英信计算机技术有限公司 一种服务器电源功耗控制方法、***、终端及存储介质
CN113270064B (zh) * 2021-05-28 2022-09-27 深圳市华星光电半导体显示技术有限公司 显示面板的驱动方法及其驱动装置、电子设备
CN113851089B (zh) * 2021-09-01 2022-11-29 深圳创维－Rgb电子有限公司 显示亮度控制方法、装置、智能终端及存储介质
CN114023268A (zh) * 2021-10-11 2022-02-08 安徽康佳电子有限公司 一种背光亮度调整方法及计算机可读存储介质
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CN114660852A (zh) * 2022-05-25 2022-06-24 南京惠华电子技术有限公司 一种新型的背光组件
CN115762427A (zh) * 2022-11-21 2023-03-07 广西世纪创新显示电子有限公司 显示屏亮度控制方法、装置、显示屏及存储介质
CN115841802B (zh) * 2023-02-27 2023-06-16 长春希达电子技术有限公司 一种实现Mini LED液晶背光控制方法的控制***

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080111502A1 (en) * 2006-11-15 2008-05-15 Samsung Electronics Co., Ltd. Backlight assembly and method of driving the same
CN102203847A (zh) * 2008-10-10 2011-09-28 夏普株式会社 图像显示用发光装置的功率控制方法、图像显示用发光装置、显示装置和电视接收装置
CN102262866A (zh) * 2010-05-28 2011-11-30 日立民用电子株式会社 液晶显示装置
US20130249958A1 (en) * 2012-03-22 2013-09-26 Canon Kabushiki Kaisha Light source control apparatus, control method for controlling the same, and liquid crystal display apparatus
CN103354936A (zh) * 2011-02-10 2013-10-16 夏普株式会社 多重显示装置和图像显示装置
CN105390096A (zh) * 2015-11-24 2016-03-09 深圳创维－Rgb电子有限公司 一种区域调光的过驱控制方法及其装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101136185B1 (ko) * 2004-12-30 2012-04-17 엘지디스플레이 주식회사 액정표시장치 및 그 구동방법
JP2008209885A (ja) * 2007-02-23 2008-09-11 Samsung Sdi Co Ltd 低電力駆動制御部及びこれを備える有機電界発光表示装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080111502A1 (en) * 2006-11-15 2008-05-15 Samsung Electronics Co., Ltd. Backlight assembly and method of driving the same
CN102203847A (zh) * 2008-10-10 2011-09-28 夏普株式会社 图像显示用发光装置的功率控制方法、图像显示用发光装置、显示装置和电视接收装置
CN102262866A (zh) * 2010-05-28 2011-11-30 日立民用电子株式会社 液晶显示装置
CN103354936A (zh) * 2011-02-10 2013-10-16 夏普株式会社 多重显示装置和图像显示装置
US20130249958A1 (en) * 2012-03-22 2013-09-26 Canon Kabushiki Kaisha Light source control apparatus, control method for controlling the same, and liquid crystal display apparatus
CN105390096A (zh) * 2015-11-24 2016-03-09 深圳创维－Rgb电子有限公司 一种区域调光的过驱控制方法及其装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115862553A (zh) * 2022-12-08 2023-03-28 四川长虹电器股份有限公司 一种多分区背光***液晶电视功率限定的方法

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