WO2018049777A1 - 一种高功率区域调光控制方法、控制装置及电视机 - Google Patents

一种高功率区域调光控制方法、控制装置及电视机 Download PDF

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Publication number
WO2018049777A1
WO2018049777A1 PCT/CN2017/071021 CN2017071021W WO2018049777A1 WO 2018049777 A1 WO2018049777 A1 WO 2018049777A1 CN 2017071021 W CN2017071021 W CN 2017071021W WO 2018049777 A1 WO2018049777 A1 WO 2018049777A1
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Prior art keywords
power
constant current
display area
total power
preset
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PCT/CN2017/071021
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English (en)
French (fr)
Inventor
余明火
姚文兴
杨晓东
杨健
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深圳创维－Rgb电子有限公司
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Publication of WO2018049777A1 publication Critical patent/WO2018049777A1/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
    • G09G3/3406—Control of illumination source

Definitions

  • the present invention relates to the field of backlight control technologies, and in particular, to a high power area dimming control method, a control device, and a television set.
  • the TV industry has always pursued the pursuit of more perfect picture and sound.
  • the development of digital technology has accelerated the development of large-size and ultra-high-definition TVs.
  • major panel manufacturers and TV manufacturers are gradually developing 100 Inch panel and TV products, large-size TVs need to achieve the best TV effect, and relatively more light bars are needed on the backlight module, which means that the TV has higher power consumption and requires the TV power board to have high Load capacity.
  • the TV needs ultra-thin features.
  • High-power TVs will inevitably bring thermal design problems, that is, TVs have higher temperatures at maximum brightness, and an actual R&D data shows that
  • the 100-inch TV has a power of 700 W at the highest TV brightness, and it works less than 10 minutes at the same time.
  • Its screen backplane temperature is even as high as 120. Above the degree, it brings serious safety hazards and system reliability design. Even with regional dimming techniques, such as a brighter scene (such as a full white field), such problems still exist.
  • a brighter scene such as a full white field
  • an object of the present invention is to provide a high-power area dimming control method, a control device, and a television set, which ensure display performance by controlling the overall power consumed by the display area within a rated power range. At the same time, it also achieves low power requirements, and avoids the safety hazards and visual effects caused by high operating temperature caused by maintaining high power state for a long time.
  • a high power area dimming control method includes the following steps:
  • the constant current of each branch of the constant current driving circuit is controlled to decrease according to the current total power and the preset rated power.
  • the receiving of the constant current driving circuit corresponds to the brightness information of the controlled display area
  • the step of outputting the corresponding constant current according to the brightness information of each display area is further include:
  • Each pixel of each frame image is divided into a plurality of pixel regions in a predetermined order, and the number and position of the pixel regions are in one-to-one correspondence with the display regions;
  • the average luminance information values of the respective pixel regions are respectively calculated, and the luminance information of each display region is output correspondingly.
  • the step of receiving the brightness information of the control area corresponding to each branch of the constant current driving circuit, and outputting the corresponding constant current according to the brightness information of each display area includes:
  • the corresponding constant current is output according to the duty ratio of the first PWM signal and the maximum current value of each display area.
  • the steps of decreasing the current flow proportionally include:
  • the duration is greater than the preset time, and the current total power is recalculated
  • the first PWM of each display area is determined according to the current total power and the preset rated power.
  • the signal duty cycle is updated to the duty cycle of the second PWM signal;
  • the second PWM signal duty ratio PWM2 P 0 / P *PWM1 , where P 0 is a preset rated power, P is the current total power, and PWM1 is the first A PWM signal duty cycle.
  • a high-power area dimming control device includes a digital signal board and a constant current board, wherein the digital signal board is connected to a constant current board, and the constant current board is provided with a plurality of sets of constant current driving circuits, and the constant current board Also set with:
  • a current output module configured to receive brightness information of a display area corresponding to each branch of the constant current driving circuit, and output a corresponding constant current according to brightness information of each display area;
  • a power calculation module configured to calculate power consumed by each display area, and obtain total power consumed by all display areas
  • timing module configured to time the duration of the total power greater than the preset power when the total power consumed by all the display areas is greater than a preset power rating
  • the adjusting module is configured to control the constant current of the output of each branch of the constant current driving circuit to be proportionally decreased according to the current total power and the preset rated power if the total power is greater than the preset rated power for a duration longer than a preset time.
  • the digital signal board is provided with:
  • a decoding module configured to decode an image signal to obtain a luminance signal of each pixel of each frame image
  • a region dividing module configured to divide each pixel of each frame image into a plurality of pixel regions in a preset order, where the number and position of the pixel regions are in one-to-one correspondence with the display region;
  • the brightness calculation module is configured to separately calculate an average brightness information value of each pixel area, and correspondingly output brightness information of each display area.
  • the current output module includes: a receiving unit, configured to receive brightness information of a display area corresponding to each branch of the constant current driving circuit;
  • a duty ratio control unit configured to calculate a first PWM corresponding to each display area according to brightness information and maximum brightness value of each display area Signal duty cycle
  • a current control unit configured to output a corresponding constant current according to the first PWM signal duty ratio and the maximum current value of each display area.
  • the power calculation module is further configured to recalculate the current total power if the total power is greater than the preset power limit for a duration greater than a preset time.
  • the adjustment module includes:
  • the updating unit is configured to: if the current total power is still greater than the preset rated power, the first display area is first according to the current total power and the preset rated power The duty cycle of the PWM signal is updated to the duty cycle of the second PWM signal;
  • a current adjustment unit configured to control the constant current of the output of each branch of the constant current driving circuit to be proportionally decreased according to the duty ratio of the second PWM signal.
  • a television set comprising the high power area dimming control device as described above.
  • the high power area dimming control method receives the display area corresponding to each branch of the constant current driving circuit by receiving Luminance information, and output corresponding constant current according to the brightness information of each display area; then calculate the power consumed by each display area, and obtain the total power consumed by all display areas; then the total power consumed by all display areas is greater than the pre- When the rated power is set, the duration of the total power greater than the preset power is counted; if the total power is greater than the preset power, the duration is greater than the preset time, and the constant current driving circuit is controlled according to the current total power and the preset rated power.
  • the constant current of the branch output decreases proportionally, and the overall power consumed by the display area is controlled within the rated power range, and the ratio of each branch current is reduced to ensure the existing contrast and picture display effect of the image information, and the display is guaranteed.
  • the effect also achieves low power requirements and avoids maintaining high power for a long time. State pose security risks and high visual impact caused by the operating temperature.
  • FIG. 1 is a flowchart of a high power area dimming control method provided by the present invention
  • the high-power area dimming control method provided by the present invention is a flowchart of a step of receiving brightness information of a display area correspondingly controlled by each branch of the constant current driving circuit, and outputting a corresponding constant current according to brightness information of each display area;
  • FIG. 4 is a structural block diagram of a high power area dimming control device provided by the present invention.
  • FIG. 5 is a structural block diagram of a constant current plate in a high power area dimming control device provided by the present invention.
  • FIG. 6 is a structural block diagram of a digital signal board in a high power area dimming control device provided by the present invention.
  • FIG. 7 is a schematic diagram of a constant current driving circuit and a display area division in an application embodiment of the high power area dimming control device provided by the present invention.
  • FIG. 8 is a flow chart showing the operation of a digital signal board in an application embodiment of the high power area dimming control apparatus provided by the present invention.
  • FIG. 9 is a flow chart showing the operation of the constant current plate in the application embodiment of the high power area dimming control device provided by the present invention.
  • the object of the present invention is to provide A high-power area dimming control method, a control device and a television set, by controlling the overall power consumed by the display area within the rated power range, ensuring the display effect while achieving low power requirements, and avoiding maintaining high for a long time Power status leads to safety hazards and visual impact caused by high operating temperatures .
  • the high power area dimming control method provided by the present invention includes the following steps:
  • the constant current of each branch of the constant current driving circuit is controlled to decrease according to the current total power and the preset rated power.
  • the high power area dimming control method provided by the present invention is based on regional dimming, and has a design on the constant current plate.
  • the group constant current driving circuit is connected in a daisy chain manner, each group can drive the light bar corresponding to the display area, receive brightness information of the display area corresponding to each branch of the constant current driving circuit, and according to the brightness information of each display area
  • the corresponding constant current is output to correspondingly drive the light bars of each display area; then the power consumed by each display area is calculated, and the total power consumed by all display areas is obtained, because the output voltage of the constant current driving circuit is a known value.
  • the power consumed by the light bar of each display area can be calculated, and the power consumed by each area is added to obtain the consumption of all the display areas, that is, the overall display screen.
  • Total power then the total power is compared with the preset rated power. If the total power is greater than the preset rated power and the maintenance time is greater than the preset time (for example, three minutes), the constant current is controlled according to the current total power and the preset rated power.
  • the method further includes:
  • Each pixel of each frame image is divided into a plurality of pixel regions in a predetermined order, and the number and position of the pixel regions are in one-to-one correspondence with the display regions;
  • the average luminance information values of the respective pixel regions are respectively calculated, and the luminance information of each display region is output correspondingly.
  • the image signal is received by the digital signal board and decoded to obtain a luminance signal of each pixel in the image, and then each pixel of each frame image is divided into a plurality of pixel regions in a preset order, and the number of the pixel regions is The position is in one-to-one correspondence with the display area, for example, according to the screen from top to bottom and from left to right, the plurality of display areas are sequentially divided, and the division of the pixel area corresponds to the division of the display area, and the number and the position are in one-to-one correspondence; Calculating average brightness information values of the respective pixel regions, correspondingly outputting brightness information of each display area, for example, For example, if the 8bit is used, the brightness information value ranges from 0 to 255, that is, the brightness information value of each pixel can be 0-255.
  • the average luminance information value is the luminance information of the corresponding display region, for example, the average luminance information value of a certain pixel region is A.
  • the corresponding display area brightness information is A.
  • the average brightness of each area is calculated by region division, which provides a data basis for subsequent dimming control.
  • the step of receiving the brightness information of the control area corresponding to each branch of the constant current driving circuit, and outputting the corresponding constant current according to the brightness information of each display area including:
  • the constant current board After the digital signal board calculates the average brightness information value of each pixel area and outputs the brightness information corresponding to the display area, the constant current board first receives the brightness information of each display area and then outputs the corresponding constant current, and the current change of the constant current driving circuit By controlling the interior
  • the duty cycle of the PWM signal is realized, that is, the maximum current value I is output when the duty ratio is 100%, and the output current is 50%I when the duty ratio is 50%.
  • the maximum luminance information value for example, is represented by an 8-bit representation.
  • the maximum luminance information value is 255.
  • the duty ratio of the first PWM signal in the region is 127/255 ⁇ 50%, according to the first PWM signal duty cycle and maximum current value of each display area, output the corresponding constant current, for example, the maximum current value is I, if the first PWM of a certain display area When the signal duty cycle is 50%, the required current for this region is 50%I.
  • the signal duty cycle controls its output current to achieve flexible control of the regional current.
  • the step of controlling the constant current of each branch of the constant current driving circuit to be proportionally decreased according to the current total power and the preset rated power, if the duration of the total power is greater than the preset power is greater than the preset time including:
  • the first PWM of each display area is determined according to the current total power and the preset rated power.
  • the signal duty cycle is updated to the duty cycle of the second PWM signal;
  • the total power is compared with the preset rated power.
  • the specific total power is calculated by first calculating the power value of each area, and the power value is the first of the area. The product of the PWM signal duty cycle, the maximum current value, and the voltage value. After calculating the power values of the respective display regions, the power values of all the display regions are added together to obtain the total power consumed by the overall display screen. The total power is compared with the preset rated value. If the total power is greater than the preset rated power, the timing starts. When the total power is greater than the preset rated power for more than the preset time, the current total power is recalculated.
  • the first PWM signal duty cycle of each display area is updated to the second PWM signal duty according to the current total power and the preset rated power.
  • the current before updating is 50. %I
  • the updated current drops to 40%I
  • each branch is proportionally reduced to 80% of the previous current, ensuring the existing contrast and picture display effect of the image information, and making the display lower.
  • the power consumption and lower heat dissipation make the overall temperature within the controllable range, and the high-power duration timing processing can further eliminate high-temperature safety hazards and damage to the user's vision.
  • the present invention accordingly also provides a high power area dimming control device, see FIG. 4 and FIG.
  • the high-power area dimming control device includes a digital signal board 10 and a constant current board 20, and the digital signal board 10 is connected to the constant current board 20, and the specific digital signal board 10 and the constant current board 20 pass The SPI interface mode performs communication.
  • the constant current plate 20 is provided with a plurality of sets of constant current driving circuits. Each group of constant current driving circuits drives a light bar corresponding to the display area, and the constant current plate 20 is further provided with a current output module 101.
  • the duration of the total power greater than the preset power rating is greater than the prese
  • the digital signal board 10 is provided with a decoding module 201 and a region dividing module 202.
  • the brightness calculation module 203, the decoding module 201, the area dividing module 202, and the brightness calculation module 203 are sequentially connected, wherein the decoding module 201 For decoding a video signal to obtain a luminance signal of each pixel of each frame of image; the area dividing module 202 For dividing each pixel of each frame image into a plurality of pixel regions in a predetermined order, the number and position of the pixel regions are in one-to-one correspondence with the display regions; the brightness calculation module 203 It is used to separately calculate an average luminance information value of each pixel region, and correspondingly output luminance information of each display region.
  • the decoding module 201 For decoding a video signal to obtain a luminance signal of each pixel of each frame of image
  • the area dividing module 202 For dividing each pixel of each frame image into a plurality of pixel regions in a predetermined order, the number and
  • the current output module 101 includes a receiving unit 1011, a duty ratio control unit 1012, and a current control unit 1013.
  • the receiving unit 1011, the duty ratio control unit 1012, and the current control unit 1013 are sequentially connected, and the duty control unit 1012 is further connected to the adjustment module 104.
  • the receiving unit 1011 is configured to receive brightness information of a display area corresponding to each branch of the constant current driving circuit; the duty ratio control unit 1012 And configured to calculate a duty ratio of the first PWM signal corresponding to each display area according to the brightness information and the maximum brightness value of each display area; the current control unit 1013 is configured to use the first PWM according to each display area
  • the signal duty cycle and the maximum current value output corresponding constant currents please refer to the corresponding embodiment of the above method.
  • the method further includes recalculating the current total power if the total power is greater than the preset power
  • the adjustment module 104 includes the updating unit 1041 and the current adjusting unit 1042.
  • the update unit 1041 connects the duty control unit 1012 and the current adjustment unit 1042, wherein the update unit 1041 For updating the first PWM signal duty ratio of each display area to the second PWM signal duty ratio according to the current total power and the preset rated power if the current total power is still greater than the preset rated power; the current adjustment unit 1042 is configured to control the constant current of the output of each branch of the constant current driving circuit to be proportionally decreased according to the duty ratio of the second PWM signal.
  • the update unit 1041 For updating the first PWM signal duty ratio of each display area to the second PWM signal duty ratio according to the current total power and the preset rated power if the current total power is still greater than the preset rated power
  • the current adjustment unit 1042 is configured to control the constant current of the output of each branch of the constant current driving circuit to be
  • the present invention further provides a television set comprising the high power area dimming control device according to any of the above, since the high power area dimming control device has been described in detail above, and is not described in detail herein. Said.
  • the constant current plate is designed with 16 sets of constant current drive circuits, each set of constant current drive circuit. Driven 16 area lamp group, constant current drive circuit 1 drive constant current area is 1-16 area, constant current drive circuit 2 drive constant current area is 17-32 area, constant current drive circuit constant current drive circuit 16 The drive constant current area is the 241-256 area.
  • Each display area is sequentially divided from top to bottom and left to right, and corresponds to each constant current driving circuit, that is, a constant current driving circuit 1 Controlling the corresponding area of the first column of backlight strips, the constant current driving circuit 2 controls the area corresponding to the second column of backlight strips, and the constant current driving circuit 16 Control the area corresponding to the sixteenth column of backlight strips.
  • a constant current driving circuit 1 Controlling the corresponding area of the first column of backlight strips
  • the constant current driving circuit 2 controls the area corresponding to the second column of backlight strips
  • the constant current driving circuit 16 Control the area corresponding to the sixteenth column of backlight strips.
  • Figure 8 As shown, after starting work, the system initializes, the digital signal board decodes the input signal, obtains the color coordinate and luminance signal of each pixel of each frame image, and then divides each pixel of each frame image according to the corresponding order.
  • the area that is, in the order of top to bottom, left to right; calculate the average of the brightness information of area 1, area 2, ... until area 256, where 0 to 255 is represented by 8 bits. (corresponding to hexadecimal 0xFF), you can think that the 100% white field, the transmitted brightness information value is 255, if it is 10bit, it is 0 ⁇ 1023 Then, according to the calculated average brightness information value, the brightness information of the output display area is corresponding.
  • the communication method sends the brightness information of the display area to the constant current board, and the constant current board returns a confirmation value after receiving the brightness information value of the pixel area of each frame, and the digital signal board starts after receiving the confirmation value of the return of the constant current return.
  • the transmission of the next frame of image if the average brightness information value of a certain pixel area is A, the corresponding display area brightness information is A, and the SPI is passed through the SPI.
  • the communication method sends the brightness information of the display area to the constant current board, and the constant current board returns a confirmation value after receiving the brightness information value of the pixel area of each frame, and the digital signal board starts after receiving the confirmation value of the return of the constant current return. The transmission of the next frame of image.
  • the MCU on the constant current board After power-on and system initialization, the brightness information of the display area controlled by each constant current driving circuit is started, and 8 bit is taken as an example, if the received value is 255. , the area needs to be displayed with maximum brightness; after receiving the brightness information value of each area, start to calculate the required LED driver internal control PWM displayed in each area, such as the receiving value of a certain area is 127 , the corresponding brightness display of this area is about 50% of the maximum brightness, and the display of each area is further controlled according to the calculated PWM value. Taking the receiving value 127 as an example, the internal control PWM should be 50%.
  • Each constant current driving circuit calculates the constant current output of the required internal control PWM control LED lamp, that is, the constant current current at this time should be 50% I Then, according to the constant current of each area and the known voltage, the power consumed by each area is calculated, and the power of each area is further added to obtain the total power P, and the power P is followed by 350W. For comparison, if the power is not greater than 350W, return to the process of receiving the brightness information; if it is greater than 350W , then start timing for about three minutes. After timing, re-calculate the power and total power of each area currently controlled, and continue to compare with 350W, if the power is not greater than 350W , return to the process of receiving the brightness information.
  • the controlled constant current internal control PWM of each area is output at a ratio of 350/P, that is, the PWM value of each area is controlled to be multiplied by 350/P.
  • the power of each area is also controlled to decrease proportionally, thereby controlling the total power of the entire screen within a preset range, ensuring the controllability of the whole machine temperature, and avoiding playing the highlight picture for a long time to the user's eyes.
  • the damage caused is preferably such that the power reduction is gradually reduced to avoid the discomfort caused by the sudden use of the user, and the low power and low heat dissipation amount can be ensured while ensuring the display effect.
  • the high power area dimming control method receives brightness information of a display area correspondingly controlled by each branch of the constant current driving circuit. And outputting a corresponding constant current according to the brightness information of each display area; then calculating the power consumed by each display area, and obtaining the total power consumed by all display areas; then when the total power consumed by all display areas is greater than the preset rating For power, the duration of the total power greater than the preset power is counted; if the total power is greater than the preset power, the duration is greater than the preset time, and the branches of the constant current driving circuit are controlled according to the current total power and the preset rated power.
  • the output constant current is proportionally decreased, and the overall power consumed by the display area is controlled within the rated power range, and the ratio of each branch current is reduced, thereby ensuring the existing contrast and picture display effect of the image information, and ensuring the display effect. At the same time, it also achieves low power requirements and avoids maintaining high power state for a long time. High operating temperature potential safety problems and visual impact.

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Abstract

一种高功率区域调光控制方法、控制装置及电视机，高功率区域调光控制方法通过接收恒流驱动电路各支路对应控制的显示区域的亮度信息，并根据各个显示区域的亮度信息输出相应的恒流电流(S100)；计算各显示区域所消耗的功率，并得出所有显示区域消耗的总功率(S200)；当所有显示区域消耗的总功率大于预设额定功率时，对总功率大于预设功率的持续时间进行计时(S300)；若总功率大于预设额定功率的持续时间大于预设时间，根据当前的总功率和预设额定功率控制恒流驱动电路各支路输出的恒流电流等比例下降(S400)。通过采用各个支路电流等比例降低，保证图像信息已有的对比度和显示效果，同时保证显示效果和低功率要求，避免长时间高功率工作带来的高温隐患。

Description

一种高功率区域调光控制方法、控制装置及电视机
技术领域
本发明涉及背光控制技术领域，特别涉及一种高功率区域调光控制方法、控制装置及电视机。
背景技术
电视行业一直以追求更完美的画面和声音为目标，数字化技术的发展，加速了大尺寸、超高清电视的发展步伐。目前各大面板厂商和电视厂商逐步开发 100 英寸的面板和电视产品，大尺寸电视要达到最佳的电视效果，在背光模组上需要相对更多的灯条，这意味着电视机具有更高的功率消耗，同时要求电视电源板具有高的带载能力。而加上用户以及开发者对电视外观的完美追求，电视更需要超薄的特点。高功率的电视也必然会带来热设计问题，即电视在最大亮度时具有更高的温度，而一项实际研发数据显示，一款 100 英寸的电视在电视亮度最高时，功率为 700 Ｗ，同时工作不到 10 分钟，其屏幕背板温度甚至高达 120 度以上，带来了严重的安全隐患和系统可靠性设计。即使是采用区域调光技术，如某一亮场较多画面（如全白场）此类问题仍然存在。同时由于家庭环境空间限制，长期相对近距离的观看高亮度下的大尺寸电视，也会使眼睛不适。
因而现有技术还有待改进和提高。
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高功率区域调光控制方法、控制装置及电视机，通过将显示区域消耗的整体功率控制在额定功率范围内，保证显示效果的同时也达到了低功率要求，且避免了长时间保持高功率状态导致工作温度高带来的安全隐患和视力影响。
为了达到上述目的，本发明采取了以下技术方案：
一种高功率区域调光控制方法，其包括如下步骤：
接收恒流驱动电路各支路对应控制的显示区域的亮度信息，并根据各个显示区域的亮度信息输出相应的恒流电流；
计算各显示区域所消耗的功率，并得出所有显示区域消耗的总功率；
当所有显示区域消耗的总功率大于预设额定功率时，对总功率大于预设功率的持续时间进行计时；
若总功率大于预设额定功率的持续时间大于预设时间，根据当前的总功率和预设额定功率控制恒流驱动电路各支路输出的恒流电流等比例下降。
所述的高功率区域调光控制方法中，所述接收恒流驱动电路各支路对应控制的显示区域的亮度信息，并根据各个显示区域的亮度信息输出相应的恒流电流的步骤之前，还包括：
对图像信号进行解码，得到每帧图像各像素的亮度信号；
将每帧图像的各像素按预设顺序划分为多个像素区域，所述像素区域的数量和位置与显示区域一一对应；
分别计算各个像素区域的平均亮度信息值，对应输出各个显示区域的亮度信息。
所述的高功率区域调光控制方法中，所述接收恒流驱动电路各支路对应控制的显示区域的亮度信息，并根据各个显示区域的亮度信息输出相应的恒流电流的步骤，包括：
接收恒流驱动电路各支路对应控制的显示区域的亮度信息；
根据各个显示区域的亮度信息和最大亮度信息值计算各显示区域对应的第一 PWM 信号占空比；
根据各个显示区域的第一 PWM 信号占空比和最大电流值输出相应的恒流电流。
所述的高功率区域调光控制方法中，所述若总功率大于预设功率的持续时间大于预设时间，根据当前的总功率和预设额定功率控制恒流驱动电路各支路输出的恒流电流等比例下降的步骤，包括：
若总功率大于预设额定功率的持续时间大于预设时间，则重新计算当前的总功率；
若当前的总功率仍然大于预设额定功率，根据当前的总功率和预设额定功率将各个显示区域的第一 PWM 信号占空比更新为第二 PWM 信号占空比；
根据所述第二 PWM 信号占空比控制恒流驱动电路各支路输出的恒流电流等比例下降。
所述的高功率区域调光控制方法中，所述第二 PWM 信号占空比 PWM2= P0/ P *PWM1 ，其中， P0 为预设额定功率， P 为当前的总功率， PWM1 为第一 PWM 信号占空比。
一种高功率区域调光控制装置，包括数字信号板和恒流板，所述数字信号板连接恒流板，所述恒流板上设置有多组恒流驱动电路，所述恒流板上还设置有：
电流输出模块，用于接收恒流驱动电路各支路对应控制的显示区域的亮度信息，并根据各个显示区域的亮度信息输出相应的恒流电流；
功率计算模块，用于计算各显示区域所消耗的功率，并得出所有显示区域消耗的总功率；
计时模块，用于当所有显示区域消耗的总功率大于预设额定功率时，对总功率大于预设功率的持续时间进行计时；
调节模块，用于若总功率大于预设额定功率的持续时间大于预设时间，根据当前的总功率和预设额定功率控制恒流驱动电路各支路输出的恒流电流等比例下降。
所述的高功率区域调光控制装置中，所述数字信号板上设置有：
解码模块，用于对图像信号进行解码，得到每帧图像各像素的亮度信号；
区域划分模块，用于将每帧图像的各像素按预设顺序划分为多个像素区域，所述像素区域的数量和位置与显示区域一一对应；
亮度计算模块，用于分别计算各个像素区域的平均亮度信息值，对应输出各个显示区域的亮度信息。
所述的高功率区域调光控制装置中，所述电流输出模块包括： 接收单元，用于接收恒流驱动电路各支路对应控制的显示区域的亮度信息；
占空比控制单元，用于根据各个显示区域的亮度信息和最大亮度值计算各显示区域对应的第一 PWM 信号占空比；
电流控制单元，用于根据各个显示区域的第一 PWM 信号占空比和最大电流值输出相应的恒流电流。
所述的高功率区域调光控制装置中，所述功率计算模块还用于若总功率大于预设额定功率的持续时间大于预设时间，则重新计算当前的总功率，
所述调节模块包括：
更新单元，用于若当前的总功率仍然大于预设额定功率，根据当前的总功率和预设额定功率将各个显示区域的第一 PWM 信号占空比更新为第二 PWM 信号占空比；
电流调节单元，用于根据所述第二 PWM 信号占空比控制恒流驱动电路各支路输出的恒流电流等比例下降。
一种电视机，其包括如上项所述的高功率区域调光控制装置。
相较于现有技术，本发明提供的高功率区域调光控制方法、控制装置及电视机中，所述高功率区域调光控制方法通过接收恒流驱动电路各支路对应控制的显示区域的亮度信息，并根据各个显示区域的亮度信息输出相应的恒流电流；之后计算各显示区域所消耗的功率，并得出所有显示区域消耗的总功率；之后当所有显示区域消耗的总功率大于预设额定功率时，对总功率大于预设功率的持续时间进行计时；若总功率大于预设额定功率的持续时间大于预设时间，根据当前的总功率和预设额定功率控制恒流驱动电路各支路输出的恒流电流等比例下降，通过将显示区域消耗的整体功率控制在额定功率范围内，且采用各个支路电流等比例降低，保证图像信息已有的对比度和画面显示效果，保证显示效果的同时也达到了低功率要求，且避免了长时间保持高功率状态导致工作温度高带来的安全隐患和视力影响。
附图说明
图 1 为本发明提供的高功率区域调光控制方法的流程图；
图 2 为本发明提供的高功率区域调光控制方法中接收恒流驱动电路各支路对应控制的显示区域的亮度信息，并根据各个显示区域的亮度信息输出相应的恒流电流的步骤的流程图；
图 3 为本发明提供的高功率区域调光控制方法中若总功率大于预设额定功率的持续时间大于预设时间，根据当前的总功率和预设额定功率控制恒流驱动电路各支路输出的恒流电流等比例下降的步骤的流程图；
图 4 为本发明提供的高功率区域调光控制装置的结构框图；
图 5 为本发明提供的高功率区域调光控制装置中恒流板的结构框图；
图 6 为本发明提供的高功率区域调光控制装置中数字信号板的结构框图；
图 7 为本发明提供的高功率区域调光控制装置中应用实施例中恒流驱动电路及显示区域划分示意图；
图 8 为本发明提供的高功率区域调光控制装置中应用实施例中数字信号板的工作流程图；
图 9 为本发明提供的高功率区域调光控制装置中应用实施例中恒流板的工作流程图。
具体实施方式
鉴于现有技术中 显示屏在高功率状态下持续工作带来的安全隐患 等缺点，本发明的目的在于提供 一种高功率区域调光控制方法、控制装置及电视机，通过将显示区域消耗的整体功率控制在额定功率范围内，保证显示效果的同时也达到了低功率要求，且避免了长时间保持高功率状态导致工作温度高带来的安全隐患和视力影响 。
为使本发明的目的、技术方案及效果更加清楚、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用以解释本发明，并不用于限定本发明。
请参阅图 1 ，本发明提供的高功率区域调光控制方法包括如下步骤：
S100 、接收恒流驱动电路各支路对应控制的显示区域的亮度信息，并根据各个显示区域的亮度信息输出相应的恒流电流；
S200 、计算各显示区域所消耗的功率，并得出所有显示区域消耗的总功率；
S300 、当所有显示区域消耗的总功率大于预设额定功率时，对总功率大于预设功率的持续时间进行计时；
S400 、若总功率大于预设额定功率的持续时间大于预设时间，根据当前的总功率和预设额定功率控制恒流驱动电路各支路输出的恒流电流等比例下降。
本发明提供的高功率区域调光控制方法是以区域调光为前提，在恒流板上设计有 N 组恒流驱动电路，以菊花链的形式连接，每组可驱动对应显示区域的灯条，通过接收恒流驱动电路各支路对应控制的显示区域的亮度信息，并根据各个显示区域的亮度信息输出相应的恒流电流，以对应驱动各显示区域的灯条；之后计算各显示区域所消耗的功率，并得出所有显示区域消耗的总功率，由于恒流驱动电路输出的电压为已知值，将该电压和各个显示区域的电流值相乘，即可计算出各显示区域的灯条所消耗的功率，将各区域所消耗的功率相加，得到所有显示区域即整体显示屏所消耗的总功率；之后将总功率与预设额定功率进行比较，若总功率大于预设额定功率并且维持时间大于预设时间（例如三分钟），则根据当前的总功率和预设额定功率控制恒流驱动电路各支路输出的恒流电流等比例下降，例如计算得到当前的总功率为 500W ，而预设额定功率为 400W ，则按照 400/500=80% 的比例控制各支路的恒流电流等比例下降，即使得调整后的电流值为调整前的 80% ，如原输出电流为 100mA 的区域支路，则调整后控制其输出电流为 80mA ，通过采用各个支路电流等比例降低，保证图像信息已有的对比度和画面显示效果，保证显示效果的同时也达到了低功率要求，且避免了长时间保持高功率状态导致工作温度高带来的安全隐患和视力影响。
进一步地，所述接收恒流驱动电路各支路对应控制的显示区域的亮度信息，并根据各个显示区域的亮度信息输出相应的恒流电流的步骤之前，还包括：
对图像信号进行解码，得到每帧图像各像素的亮度信号；
将每帧图像的各像素按预设顺序划分为多个像素区域，所述像素区域的数量和位置与显示区域一一对应；
分别计算各个像素区域的平均亮度信息值，对应输出各个显示区域的亮度信息。
具体实施时，由数字信号板接收图像信号并进行解码，获取图像中每个像素亮度信号，之后将每帧图像的各像素按预设顺序划分为多个像素区域，所述像素区域的数量和位置与显示区域一一对应，例如按照屏幕从上到下、从左到右的顺序依次划分为多个显示区域，像素区域的划分则对应显示区域的划分，数量与位置均一一对应；之后分别计算各个像素区域的平均亮度信息值，对应输出各个显示区域的亮度信息，例如，以 8bit 为例，则亮度信息值的范围为 0-255 ，即各个像素的亮度信息值可为 0-255 ，通过获取每个像素的亮度信号，并且计算的出各个像素区域的平均亮度信息值，该平均亮度信息值则为对应显示区域的亮度信息，例如，某一像素区域的平均亮度信息值为 A ，则对应的显示区域亮度信息为 A 。通过区域划分计算各个区域的平均亮度，为后续调光控制提供数据基础。
具体地，请参阅图 2 ，所述接收恒流驱动电路各支路对应控制的显示区域的亮度信息，并根据各个显示区域的亮度信息输出相应的恒流电流的步骤，包括：
S101 、接收恒流驱动电路各支路对应控制的显示区域的亮度信息；
S102 、根据各个显示区域的亮度信息和最大亮度信息值计算各显示区域对应的第一 PWM 信号占空比；
S103 、根据各个显示区域的第一 PWM 信号占空比和最大电流值输出相应的恒流电流。
数字信号板计算出各像素区域的平均亮度信息值并输出对应显示区域的亮度信息后，恒流板先接收各个显示区域的亮度信息再输出相应的恒流电流，而恒流驱动电路的电流变化时通过控制内部 PWM 信号占空比来实现，即占空比为 100% 时输出最大电流值 I ，占空比为 50% 时，输出电流为 50%I ，具体为，根据各个显示区域的亮度信息和最大亮度信息值计算各显示区域对应的第一 PWM 信号占空比，第一 PWM 信号占空比 = 各个显示区域的亮度信息 / 最大亮度信息值，例如，以 8bit 表示为例，最大亮度信息值为 255 ，若当前接收的某一区域的亮度信息为 127 ，则该区域的第一 PWM 信号占空比为 127/255 ≈ 50% ，根据各个显示区域的第一 PWM 信号占空比和最大电流值输出相应的恒流电流，例如最大电流值为 I ，若某一显示区域的第一 PWM 信号占空比为 50% 时，则该区域的所需要的电流为 50%I 。通过控制各个区域的第一 PWM 信号占空比来控制其输出电流，实现区域电流的灵活控制调节。
进一步地，请参阅图 3 ，所述若总功率大于预设功率的持续时间大于预设时间，根据当前的总功率和预设额定功率控制恒流驱动电路各支路输出的恒流电流等比例下降的步骤，包括：
S401 、若总功率大于预设额定功率的持续时间大于预设时间，则重新计算当前的总功率；
S402 、若当前的总功率仍然大于预设额定功率，根据当前的总功率和预设额定功率将各个显示区域的第一 PWM 信号占空比更新为第二 PWM 信号占空比；
S403 、根据所述第二 PWM 信号占空比控制恒流驱动电路各支路输出的恒流电流等比例下降。
具体实施时，在计算了所有显示区域的总功率后，将总功率与预设额定功率比较，具体总功率的计算方法为，先分别计算各个区域的功率值，该功率值为该区域的第一 PWM 信号占空比、最大电流值、电压值三者的乘积，在计算出各个显示区域的功率值之后，再将所有显示区域的功率值相加，即可得到整体显示屏消耗的总功率，将总功率与预设额定用了进行比较，如果总功率大于预设额定功率，则开始计时，当总功率大于预设额定功率的持续时间大于预设时间时，重新计算当前的总功率，确保功率计算的准确性，若当前的总功率仍然大于预设额定功率，则根据当前的总功率和预设额定功率将各个显示区域的第一 PWM 信号占空比更新为第二 PWM 信号占空比，具体的更新规则为，第二 PWM 信号占空比 PWM2=P0/P *PWM1 ，其中， P0 为预设额定功率， P 为当前的总功率， PWM1 为第一 PWM 信号占空比，例如当前的总功率为 500W ，预设额定功率为 400W ，第一 PWM 信号占空比为 50% ，则更新后的第二 PWM 信号占空比 PWM2=400/500*50%=40% ，之后根据新的占空比，即第二 PWM 信号占空比控制恒流驱动电路各支路输出的恒流电流等比例下降，例如更新前的电流为 50%I ，则更新后的电流下降为 40%I ，且各个支路均是等比例下降为之前电流的 80% ，保证图像信息已有的对比度和画面显示效果，且使得显示屏具有更低的消耗功率和更低的散热量，使其整体温度在可控范围内，同时通过高功率持续时间计时处理也能进一步消除高温安全隐患和对用户视力的损伤。
本发明相应还提供一种高功率区域调光控制装置，请参阅图 4 和图 5 ，所述高功率区域调光控制装置，包括数字信号板 10 和恒流板 20 ，所述数字信号板 10 连接恒流板 20 ，具体数字信号板 10 与恒流板 20 通过 SPI 接口方式进行通讯，所述恒流板 20 上设置有多组恒流驱动电路，每组恒流驱动电路驱动对应显示区域的灯条，所述恒流板 20 上还设置有电流输出模块 101 、功率计算模块 102 、计时模块 103 和调节模块 104 ，所述电流输出模块 101 、功率计算模块 102 、计时模块 103 依次连接，所述电流输出模块 101 还连接调节模块 104 ，其中，所述电流输出模块 101 用于接收恒流驱动电路各支路对应控制的显示区域的亮度信息，并根据各个显示区域的亮度信息输出相应的恒流电流；所述功率计算模块 102 用于计算各显示区域所消耗的功率，并得出所有显示区域消耗的总功率；所述计时模块 103 用于当所有显示区域消耗的总功率大于预设额定功率时，对总功率大于预设功率的持续时间进行计时；所述调节模块 104 用于若总功率大于预设额定功率的持续时间大于预设时间，根据当前的总功率和预设额定功率控制恒流驱动电路各支路输出的恒流电流等比例下降。具体请参阅上述方法对应的实施例。
进一步地，请一并参阅图 6 ，所述数字信号板 10 上设置有解码模块 201 、区域划分模块 202 和亮度计算模块 203 ，所述解码模块 201 、区域划分模块 202 和亮度计算模块 203 依次连接，其中，所述解码模块 201 用于对视频信号进行解码，得到每帧图像各像素的亮度信号；所述区域划分模块 202 用于将每帧图像的各像素按预设顺序划分为多个像素区域，所述像素区域的数量和位置与显示区域一一对应；所述亮度计算模块 203 用于分别计算各个像素区域的平均亮度信息值，对应输出各个显示区域的亮度信息。具体请参阅上述方法对应的实施例。
具体地，电流输出模块 101 包括接收单元 1011 、占空比控制单元 1012 和电流控制单元 1013 ，所述接收单元 1011 、占空比控制单元 1012 和电流控制单元 1013 依次连接，所述占空比控制单元 1012 还连接调节模块 104 ，其中，所述接收单元 1011 用于接收恒流驱动电路各支路对应控制的显示区域的亮度信息；所述占空比控制单元 1012 用于根据各个显示区域的亮度信息和最大亮度值计算各显示区域对应的第一 PWM 信号占空比；所述电流控制单元 1013 用于根据各个显示区域的第一 PWM 信号占空比和最大电流值输出相应的恒流电流。具体请参阅上述方法对应的实施例。
进一步地，所述功率计算模块 102 还用于若总功率大于预设额定功率的持续时间大于预设时间，则重新计算当前的总功率，所述调节模块 104 包括更新单元 1041 和电流调节单元 1042 ，所述更新单元 1041 连接占空比控制单元 1012 和电流调节单元 1042 ，其中，所述更新单元 1041 用于若当前的总功率仍然大于预设额定功率，根据当前的总功率和预设额定功率将各个显示区域的第一 PWM 信号占空比更新为第二 PWM 信号占空比；所述电流调节单元 1042 用于根据所述第二 PWM 信号占空比控制恒流驱动电路各支路输出的恒流电流等比例下降。具体请参阅上述方法对应的实施例。
本发明还相应提供一种电视机，其包括如上任意一项所述的高功率区域调光控制装置，由于上文对所述高功率区域调光控制装置已进行了详细描述，此处不作详述。
为了更好的理解本发明的技术方案，以下结合图 7 、图 8 和图 9 ，举具体实施例对本发明的高功率区域调光控制装置的调整过程进行详细说明：
以某 100 英寸 4K 显示屏，采用 256 区域调光为例，各显示区域在达到最大亮度时，显示屏消耗功率为 700W ，已知最大时，恒流驱动电流为 I ，电压为 U （电压为固定值），如图 7 所示，恒流板共设计有 16 组恒流驱动电路，其中每组恒流驱动电路可驱动 16 区域的灯组，恒流驱动电路 1 驱动恒流区域为 1-16 区域，恒流驱动电路 2 驱动恒流区域为 17-32 区域，恒流驱动电路恒流驱动电路 16 驱动恒流区域为 241-256 区域。
各个显示区域对应屏幕从上到下、从左到右的顺序依次划分，且对应各恒流驱动电路，即恒流驱动电路 1 控制第一列背光灯条所对应区域 ，恒流驱动电路 2 控制第二列背光灯条所对应区域，恒流驱动电路 16 控制第十六列背光灯条所对应区域。按照系统设计需求，在高温环境工作状态下，最大温度不超 120 度，比如长时间工作， LED 温度在可靠以及画面舒适的情况下预设额定功率应为 350W ，即全白场时，需要降低显示屏的峰值亮度的 50% 或以下。
如图 8 所示，开始工作后，系统进行初始化，数字信号板对输入的信号进行解码，得到每帧图像各像素的色坐标和亮度信号，然后对每帧图像的各像素按照对应顺序进行划分 256 区域，即按照上往下，左往右的顺序；分别计算区域 1 、区域 2 、 ... 一直到区域 256 的亮度信息的平均值，此处如用 8bit 表示，则为 0~255 （对应十六进制 0xFF ），即可认为 100% 白场时，所传送的亮度信息值为 255 ，如为 10bit 表示，则为 0~1023 ，之后根据计算的平均亮度信息值对应输出显示区域的亮度信息，例如，某一像素区域的平均亮度信息值为 A ，则对应的显示区域亮度信息为 A ，通过 SPI 通信方式将显示区域的亮度信息发送给恒流板，恒流板在接收每帧的像素区域亮度信息值后会返回一确认值，数字信号板在接收到恒流返回的接收确认值后开始进行下一帧图像的传送。
如图 9 所示，当系统正常工作后，恒流板上的 MCU 上电并进行系统初始化，之后开始接收各恒流驱动电路所控制的显示区域的亮度信息，以 8bit 为例，如接收到的值为 255 ，则该区域需要以最大亮度显示；在接收到各区域的亮度信息值后，开始计算各区域所显示所需要的 LED 驱动内控 PWM ，如某一区域的接收值为 127 ，则此区域对应的亮度显示约为最大亮度的 50% ，进一步根据计算的 PWM 值控制各区域的显示，以接收值 127 为例，此时内控 PWM 应为 50% ，各恒流驱动电路以计算得到所需的内控 PWM 控制 LED 灯的恒流电流输出，即此时的恒流电流应为 50%I ，之后根据各个区域的恒流电流以及已知的电压，计算各个区域消耗的功率，进一步的对各个区域的功率相加，得到总功率 P ，将该功率 P 跟 350W 进行比较，如果功率不大于 350W ，则返回到接收亮度信息的流程；如果大于 350W ，则开始计时约三分钟，在计时后，重新计当前控制的各区域的功率以及总功率，并继续跟 350W 进行比较，如果功率不大于 350W ，则返回到接收亮度信息的流程，如果大于 350W ，将各个区域的控恒流内控 PWM 以 350/P 的比例输出，即控制各个区域的 PWM 值乘以 350/P 的比例后再输出，更新后的恒流电流 I1=350/P*PWM1*I ，其中 P 为总功率， PWM1 为更新前的 PWM 值， I 为最大电流值，从而控制各区域的功率也等比例下降，进而控制整个屏幕的总功率在预设范围内，保证整机温度的可控性，同时避免了长时间播放高亮画面对用户眼睛造成的损害，优选地，所述功率的降低是逐步降低的，以避免出现突变引起用户使用的不适感，保证低功率低散热量的同时也能保证显示效果。
综上所述，本发明提供的高功率区域调光控制方法、控制装置及电视机中，所述高功率区域调光控制方法通过接收恒流驱动电路各支路对应控制的显示区域的亮度信息，并根据各个显示区域的亮度信息输出相应的恒流电流；之后计算各显示区域所消耗的功率，并得出所有显示区域消耗的总功率；之后当所有显示区域消耗的总功率大于预设额定功率时，对总功率大于预设功率的持续时间进行计时；若总功率大于预设额定功率的持续时间大于预设时间，根据当前的总功率和预设额定功率控制恒流驱动电路各支路输出的恒流电流等比例下降，通过将显示区域消耗的整体功率控制在额定功率范围内，且采用各个支路电流等比例降低，保证图像信息已有的对比度和画面显示效果，保证显示效果的同时也达到了低功率要求，且避免了长时间保持高功率状态导致工作温度高带来的安全隐患和视力影响。
可以理解的是，对本领域普通技术人员来说，可以根据本发明的技术方案及其发明构思加以等同替换或改变，而所有这些改变或替换都应属于本发明所附的权利要求的保护范围。

Claims (13)

  1. 一种高功率区域调光控制方法，其特征在于，包括如下步骤：
    接收恒流驱动电路各支路对应控制的显示区域的亮度信息，并根据各个显示区域的亮度信息输出相应的恒流电流；
    计算各显示区域所消耗的功率，并得出所有显示区域消耗的总功率；
    当所有显示区域消耗的总功率大于预设额定功率时，对总功率大于预设功率的持续时间进行计时；
    若总功率大于预设额定功率的持续时间大于预设时间，根据当前的总功率和预设额定功率控制恒流驱动电路各支路输出的恒流电流等比例下降。
  2. 根据权利要求 1 所述的高功率区域调光控制方法，其特征在于，所述接收恒流驱动电路各支路对应控制的显示区域的亮度信息，并根据各个显示区域的亮度信息输出相应的恒流电流的步骤之前，还包括：
    对图像信号进行解码，得到每帧图像各像素的亮度信号；
    将每帧图像的各像素按预设顺序划分为多个像素区域，所述像素区域的数量和位置与显示区域一一对应；
    分别计算各个像素区域的平均亮度信息值，对应输出各个显示区域的亮度信息。
  3. 根据权利要求 1 所述的高功率区域调光控制方法，其特征在于，所述接收恒流驱动电路各支路对应控制的显示区域的亮度信息，并根据各个显示区域的亮度信息输出相应的恒流电流的步骤，包括：
    接收恒流驱动电路各支路对应控制的显示区域的亮度信息；
    根据各个显示区域的亮度信息和最大亮度信息值计算各显示区域对应的第一 PWM 信号占空比；
    根据各个显示区域的第一 PWM 信号占空比和最大电流值输出相应的恒流电流。
  4. 根据权利要求 3 所述的高功率区域调光控制方法，其特征在于，所述若总功率大于预设功率的持续时间大于预设时间，根据当前的总功率和预设额定功率控制恒流驱动电路各支路输出的恒流电流等比例下降的步骤，包括：
    若总功率大于预设额定功率的持续时间大于预设时间，则重新计算当前的总功率；
    若当前的总功率仍然大于预设额定功率，根据当前的总功率和预设额定功率将各个显示区域的第一 PWM 信号占空比更新为第二 PWM 信号占空比；
    根据所述第二 PWM 信号占空比控制恒流驱动电路各支路输出的恒流电流等比例下降。
  5. 根据权利要求 4 所述的高功率区域调光控制方法，其特征在于，所述第二 PWM 信号占空比 PWM2= P0/ P*PWM1 ，其中， P0 为预设额定功率， P 为当前的总功率， PWM1 为第一 PWM 信号占空比。
  6. 一种高功率区域调光控制装置，包括数字信号板和恒流板，所述数字信号板连接恒流板，所述恒流板上设置有多组恒流驱动电路，其特征在于，所述恒流板上还设置有：
    电流输出模块，用于接收恒流驱动电路各支路对应控制的显示区域的亮度信息，并根据各个显示区域的亮度信息输出相应的恒流电流；
    功率计算模块，用于计算各显示区域所消耗的功率，并得出所有显示区域消耗的总功率；
    计时模块，用于当所有显示区域消耗的总功率大于预设额定功率时，对总功率大于预设功率的持续时间进行计时；
    调节模块，用于若总功率大于预设额定功率的持续时间大于预设时间，根据当前的总功率和预设额定功率控制恒流驱动电路各支路输出的恒流电流等比例下降。
  7. 根据权利要求 6 所述的高功率区域调光控制装置，其特征在于，所述数字信号板上设置有：
    解码模块，用于对图像信号进行解码，得到每帧图像各像素的亮度信号；
    区域划分模块，用于将每帧图像的各像素按预设顺序划分为多个像素区域，所述像素区域的数量和位置与显示区域一一对应；
    亮度计算模块，用于分别计算各个像素区域的平均亮度信息值，对应输出各个显示区域的亮度信息。
  8. 根据权利要求 6 所述的高功率区域调光控制装置，其特征在于，所述电流输出模块包括： 接收单元，用于接收恒流驱动电路各支路对应控制的显示区域的亮度信息；
    占空比控制单元，用于根据各个显示区域的亮度信息和最大亮度值计算各显示区域对应的第一 PWM 信号占空比；
    电流控制单元，用于根据各个显示区域的第一 PWM 信号占空比和最大电流值输出相应的恒流电流。
  9. 根据权利要求 8 所述的高功率区域调光控制装置，其特征在于，所述功率计算模块还用于若总功率大于预设额定功率的持续时间大于预设时间，则重新计算当前的总功率，
    所述调节模块包括：
    更新单元，用于若当前的总功率仍然大于预设额定功率，根据当前的总功率和预设额定功率将各个显示区域的第一 PWM 信号占空比更新为第二 PWM 信号占空比；
    电流调节单元，用于根据所述第二 PWM 信号占空比控制恒流驱动电路各支路输出的恒流电流等比例下降。
  10. 一种电视机，其特征在于，包括高功率区域调光控制装置，所述高功率区域调光控制装置包括数字信号板和恒流板，所述数字信号板连接恒流板，所述恒流板上设置有多组恒流驱动电路，其中，所述恒流板上还设置有：
    电流输出模块，用于接收恒流驱动电路各支路对应控制的显示区域的亮度信息，并根据各个显示区域的亮度信息输出相应的恒流电流；
    功率计算模块，用于计算各显示区域所消耗的功率，并得出所有显示区域消耗的总功率；
    计时模块，用于当所有显示区域消耗的总功率大于预设额定功率时，对总功率大于预设功率的持续时间进行计时；
    调节模块，用于若总功率大于预设额定功率的持续时间大于预设时间，根据当前的总功率和预设额定功率控制恒流驱动电路各支路输出的恒流电流等比例下降。
  11. 根据权利要求 10 所述的电视机，其特征在于，所述数字信号板上设置有：
    解码模块，用于对图像信号进行解码，得到每帧图像各像素的亮度信号；
    区域划分模块，用于将每帧图像的各像素按预设顺序划分为多个像素区域，所述像素区域的数量和位置与显示区域一一对应；
    亮度计算模块，用于分别计算各个像素区域的平均亮度信息值，对应输出各个显示区域的亮度信息。
  12. 根据权利要求 10 所述的电视机，其特征在于，所述电流输出模块包括： 接收单元，用于接收恒流驱动电路各支路对应控制的显示区域的亮度信息；
    占空比控制单元，用于根据各个显示区域的亮度信息和最大亮度值计算各显示区域对应的第一 PWM 信号占空比；
    电流控制单元，用于根据各个显示区域的第一 PWM 信号占空比和最大电流值输出相应的恒流电流。
  13. 根据权利要求 12 所述的电视机，其特征在于，所述功率计算模块还用于若总功率大于预设额定功率的持续时间大于预设时间，则重新计算当前的总功率，
    所述调节模块包括：
    更新单元，用于若当前的总功率仍然大于预设额定功率，根据当前的总功率和预设额定功率将各个显示区域的第一 PWM 信号占空比更新为第二 PWM 信号占空比；
    电流调节单元，用于根据所述第二PWM 信号占空比控制恒流驱动电路各支路输出的恒流电流等比例下降。
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