TWI677861B - Local dimming system adaptable to a backlight of a display - Google Patents
Local dimming system adaptable to a backlight of a display Download PDFInfo
- Publication number
- TWI677861B TWI677861B TW107133055A TW107133055A TWI677861B TW I677861 B TWI677861 B TW I677861B TW 107133055 A TW107133055 A TW 107133055A TW 107133055 A TW107133055 A TW 107133055A TW I677861 B TWI677861 B TW I677861B
- Authority
- TW
- Taiwan
- Prior art keywords
- pulse width
- width modulation
- value
- backlight
- dimming system
- Prior art date
Links
Landscapes
- Liquid Crystal Display Device Control (AREA)
- Liquid Crystal (AREA)
Abstract
一種適用於顯示器背光的區域調光系統,包含平均估算單元,其接收影像並估算其平均值;脈寬調變增益控制單元,其根據平均值以產生脈寬調變增益值;空間濾波器,其於空間域處理複數平均值,以增強複數脈寬調變增益值,因而產生增強脈寬調變增益值;場景改變偵測單元,其根據平均估算單元所產生之直方圖平均值,以偵測場景改變;時域濾波器,其根據增強脈寬調變增益值及偵測場景改變的結果,於時間域執行以產生脈寬調變值;光形模擬單元,其根據脈寬調變值以產生光度增益;及像素補償單元,其根據光度增益以執行影像的像素補償,因而產生補償影像。An area dimming system suitable for a display backlight includes an average estimation unit that receives an image and estimates an average value thereof; a pulse width modulation gain control unit that generates a pulse width modulation gain value based on the average value; a spatial filter, It processes the complex average value in the spatial domain to enhance the complex pulse width modulation gain value, thereby generating an enhanced pulse width modulation gain value; the scene change detection unit, based on the histogram average value generated by the average estimation unit, detects Measuring scene change; time-domain filter, which executes in the time domain to generate a pulse width modulation value based on the results of enhancing the pulse width modulation gain value and detecting the scene change; a light shape simulation unit, which is based on the pulse width modulation value To generate a photometric gain; and a pixel compensation unit that performs pixel compensation of the image according to the photometric gain, thereby generating a compensated image.
Description
本發明係有關一種背光的調光,特別是關於一種適用於液晶顯示器的發光二極體背光的區域調光系統。The invention relates to a backlight dimming, in particular to an area dimming system suitable for a light emitting diode backlight of a liquid crystal display.
液晶顯示器(LCD)本身不會發光,需要使用背光(backlight)以提供照射光給液晶顯示器。背光的光源可包含發光二極體(LED)。A liquid crystal display (LCD) does not emit light by itself, and a backlight is required to provide illumination to the liquid crystal display. The light source of the backlight may include a light emitting diode (LED).
為增進對比(contrast),使用背光調光(dimming)技術以動態控制背光的光度(luminance)。全域(global)調光是背光調光的其中一種技術,其係同時控制整個顯示面板的光度。全域調光可增進相鄰圖框(frame)間的動態對比(dynamic contrast)。區域(local)調光是另一種背光調光技術,其係控制單一圖框的顯示面板一部分的光度。區域調光可增進靜態對比(static contrast)。To enhance the contrast, backlight dimming technology is used to dynamically control the brightness of the backlight. Global dimming is one of the techniques for backlight dimming, which controls the brightness of the entire display panel at the same time. Global dimming can enhance dynamic contrast between adjacent frames. Local dimming is another backlight dimming technology that controls the brightness of a portion of the display panel of a single frame. Area dimming can enhance static contrast.
傳統調光方法(特別是區域調光方法)存在有光度不均勻(luminance unevenness)與閃爍(flicker)的問題。更重要的是,傳統區域調光方法無法有效降低功率消耗。因此亟需提出一種新穎機制以克服傳統區域調光方法的缺點。The conventional dimming method (especially the area dimming method) has the problems of luminance unevenness and flicker. More importantly, traditional area dimming methods cannot effectively reduce power consumption. Therefore, it is urgent to propose a novel mechanism to overcome the shortcomings of traditional regional dimming methods.
鑑於上述,本發明實施例的目的之一在於提出一種適用於液晶顯示器的發光二極體背光的區域調光系統,可有效降低功率消耗。在一實施例中,區域調光系統可調整調光速度並可避免閃爍。In view of the foregoing, one of the objectives of the embodiments of the present invention is to propose an area dimming system suitable for a light emitting diode backlight of a liquid crystal display, which can effectively reduce power consumption. In one embodiment, the area dimming system can adjust the dimming speed and avoid flicker.
根據本發明實施例,適用於顯示器背光的區域調光系統包含平均估算單元、脈寬調變增益控制單元、空間濾波器、場景改變偵測單元、時域濾波器、光形模擬單元及像素補償單元。平均估算單元接收影像並估算其平均值。脈寬調變增益控制單元根據平均值以產生脈寬調變增益值。空間濾波器於空間域處理複數平均值,以增強複數脈寬調變增益值,因而產生增強脈寬調變增益值。場景改變偵測單元根據平均估算單元所產生之直方圖平均值,以偵測場景改變。時域濾波器根據增強脈寬調變增益值及偵測場景改變的結果,於時間域執行以產生脈寬調變值。光形模擬單元根據脈寬調變值以產生光度增益。像素補償單元根據光度增益以執行影像的像素補償,因而產生補償影像。According to an embodiment of the present invention, an area dimming system suitable for a display backlight includes an average estimation unit, a pulse width modulation gain control unit, a spatial filter, a scene change detection unit, a time domain filter, a light shape simulation unit, and pixel compensation. unit. The average estimation unit receives an image and estimates an average value thereof. The pulse width modulation gain control unit generates a pulse width modulation gain value according to the average value. The spatial filter processes the complex average value in the spatial domain to enhance the complex pulse width modulation gain value, thereby generating an enhanced pulse width modulation gain value. The scene change detection unit detects a scene change according to the histogram average value generated by the average estimation unit. The time-domain filter is executed in the time domain to generate a pulse width modulation value according to the result of enhancing the pulse width modulation gain value and detecting a scene change. The light shape simulation unit generates a photometric gain according to a pulse width modulation value. The pixel compensation unit performs pixel compensation of the image according to the photometric gain, thereby generating a compensated image.
第一圖顯示本發明實施例之適用於液晶顯示器的發光二極體背光的區域調光系統100的方塊圖。區域調光系統100的方塊可使用硬體(例如數位影像處理器)、軟體或其組合來實施。The first figure shows a block diagram of an area dimming system 100 suitable for a light emitting diode backlight of a liquid crystal display according to an embodiment of the present invention. The blocks of the area dimming system 100 may be implemented using hardware (such as a digital image processor), software, or a combination thereof.
在本實施例中,區域調光系統100可包含平均估算單元11,其接收影像並估算其平均值。根據本實施例的特徵之一,平均值可根據影像的直方圖(histogram)來估算。平均估算單元11可包含最大亮度(brightness)單元111,用以決定影像每一像素的最大亮度,但不分顏色(例如紅色、綠色及藍色)。第二圖的示意圖例示決定影像每一像素的最大亮度。如第二圖所例示,決定每一像素的最大亮度(例如像素0的v0、像素1的v1等),顯示如右手邊的長條圖。藉此,可得到算術平均值(arithmetic mean value)HGL mean如下: 其中floor代表取整函數(floor function),其輸出小於或等於輸入的最大整數。 In this embodiment, the area dimming system 100 may include an average estimation unit 11 that receives an image and estimates an average value thereof. According to one of the features of this embodiment, the average value can be estimated from a histogram of the image. The average estimation unit 11 may include a maximum brightness unit 111 for determining the maximum brightness of each pixel of the image, but without distinction of colors (such as red, green, and blue). The schematic diagram of the second figure illustrates determining the maximum brightness of each pixel of the image. As illustrated in the second figure, the maximum brightness of each pixel (for example, v0 of pixel 0, v1 of pixel 1, etc.) is determined, and a bar graph as shown on the right hand side is displayed. From this, the arithmetic mean value (HGL mean ) can be obtained as follows: Floor is a floor function whose output is less than or equal to the largest integer input.
平均估算單元11可包含直方圖單元112,其根據影像的直方圖以產生直方圖平均值。第三圖的示意圖例示根據影像的直方圖以產生直方圖平均值。如第三圖所例示,將影像分割為複數區塊,以其灰階建構如右手邊的直方圖。該些區塊可相應於背光的發光二極體。接著,從最大灰階往最低灰階方向,累計灰階的計數值,當達到預設臨界值時,相應灰階設為直方圖平均值HGL high,其可表示如下: 若S31+S30+…+Sn≧臨界值 則HGL high=n The average estimation unit 11 may include a histogram unit 112 that generates a histogram average value based on the histogram of the image. The schematic diagram of the third figure illustrates histogram generation from an image to generate a histogram average. As illustrated in the third figure, the image is divided into a plurality of blocks, and a histogram like the right-hand side is constructed with its gray scale. These blocks may correspond to the light-emitting diodes of the backlight. Then, from the maximum gray level to the lowest gray level, the accumulated gray level count value is accumulated. When the preset gray level is reached, the corresponding gray level is set to the average histogram HGL high , which can be expressed as follows: If Sn ≧ critical value, HGL high = n
平均估算單元11可包含權重控制單元113,用以產生平均值。在本實施例中,平均值係根據算術平均值HGL mean與直方圖平均值HGL high來產生。在一例子中,平均值HGL out可表示如下: 其中max函數輸出二個輸入當中的最大值,w 1、w 2代表權重。 The average estimation unit 11 may include a weight control unit 113 for generating an average value. In this embodiment, the average value is generated based on the arithmetic mean HGL mean and the histogram mean HGL high . In one example, the average HGL out can be expressed as follows: The max function outputs the maximum of the two inputs, and w 1 and w 2 represent weights.
本實施例之區域調光系統100可包含脈寬調變(PWM)增益控制單元12,其根據(平均估算單元11的)平均值以產生脈寬調變增益值。脈寬調變增益值用以控制提供給發光二極體背光的功率。脈寬調變增益值愈大,提供給發光二極體背光的總功率愈高。第四A圖例示脈寬調變增益值與平均值的關係曲線。在這個例子中,脈寬調變增益值與平均值呈線性關係。第四B圖例示脈寬調變增益值與平均值的另一關係曲線。在這個例子中,脈寬調變增益值與平均值也呈線性關係,但是在高平均值處為平緩上升。第四C圖例示脈寬調變增益值與平均值的又一關係曲線。在這個例子中,脈寬調變增益值與平均值呈伽瑪(gamma)校正的非線性關係。在本實施例中,脈寬調變增益值可根據事先產生的查表(lookup table)來產生,以節省計算時間。The area dimming system 100 of this embodiment may include a pulse width modulation (PWM) gain control unit 12 that generates a pulse width modulation gain value according to an average value (of the average estimation unit 11). The pulse width modulation gain value is used to control the power provided to the light-emitting diode backlight. The larger the pulse width modulation gain value, the higher the total power provided to the light emitting diode backlight. The fourth graph A illustrates the relationship between the pulse width modulation gain value and the average value. In this example, the PWM gain value is linearly related to the average. The fourth graph B illustrates another relationship curve between the PWM gain value and the average value. In this example, the pulse width modulation gain value also has a linear relationship with the average value, but it rises gently at high average values. The fourth graph C illustrates another relationship curve between the pulse width modulation gain value and the average value. In this example, the pulse width modulation gain value has a non-linear relationship with the gamma correction of the average value. In this embodiment, the pulse width modulation gain value may be generated according to a lookup table generated in advance to save calculation time.
本實施例之區域調光系統100可包含空間濾波器(spatial filter)13,其於空間域處理平均值HGL,以增強脈寬調變增益值,因而產生增強(enhanced)脈寬調變增益值。第五A圖例示脈寬調變增益值,第五B圖例示空間濾波器的要素,其相應於第五A圖的脈寬調變增益值。在一例子中,空間濾波器執行第五A圖及第五B圖所示例子以產生增強脈寬調變增益值HGL’的操作如下: 若HGL’_tmp1≧255 則HGL’_temp1=255 HGL’_tmp2=Max(HGL0, HGL1, … HGL98) 若HGL’_tmp<HGL 則HGL’=HGL 否則HGL’=HGL’_tmp The area dimming system 100 of this embodiment may include a spatial filter 13 that processes the average HGL in the spatial domain to enhance the pulse width modulation gain value, thereby generating an enhanced pulse width modulation gain value. . The fifth graph A illustrates the pulse width modulation gain value, and the fifth graph B illustrates the elements of the spatial filter, which correspond to the pulse width modulation gain value of the fifth A graph. In an example, the spatial filter performs the operations shown in the fifth diagram A and the fifth diagram B to generate the enhanced pulse width modulation gain value HGL 'as follows: If HGL'_tmp1 ≧ 255 then HGL'_temp1 = 255 HGL'_tmp2 = Max (HGL0, HGL1,… HGL98) If HGL'_tmp <HGL then HGL '= HGL otherwise HGL' = HGL'_tmp
本實施例之區域調光系統100可包含場景改變偵測(scene change detection)單元14,其根據(直方圖單元112的)直方圖平均值以偵測場景改變。The area dimming system 100 of this embodiment may include a scene change detection unit 14 that detects a scene change based on the histogram average (of the histogram unit 112).
本實施例之區域調光系統100可包含時域濾波器(temporal filter)15,其根據(空間濾波器13的)增強脈寬調變增益值及(場景改變偵測單元14的)場景改變偵測結果,於時間域執行以調整調光速度並防止閃爍(flicker),因而產生脈寬調變值。The area dimming system 100 of this embodiment may include a temporal filter 15 which is based on the enhanced pulse width modulation gain value (of the spatial filter 13) and the scene change detection (of the scene change detection unit 14). The measurement results are executed in the time domain to adjust the dimming speed and prevent flicker, thereby generating a pulse width modulation value.
根據本實施例的另一特徵,時域濾波器15可提供功率限制(constraint)模式,使得脈寬調變值可受限於最大值。在本實施例中,可根據脈寬調變值的總和以限制脈寬調變值,其中該些脈寬調變值分別相應於背光的發光二極體。According to another feature of this embodiment, the time domain filter 15 may provide a power constraint mode so that the pulse width modulation value may be limited to a maximum value. In this embodiment, the pulse width modulation values can be limited according to the sum of the pulse width modulation values, wherein the pulse width modulation values respectively correspond to the light-emitting diodes of the backlight.
本實施例之區域調光系統100可包含光形模擬(light shape imitation)單元16,其根據(時域濾波器15的)脈寬調變值以產生光度(luminance)增益。區域調光系統100還可包含像素補償單元17,其根據(光形模擬單元16的)光度增益以執行影像的像素補償,因而產生補償影像。光度增益可表示如下: 光度增益 = (光度) (-1/r)其中r代表伽瑪(gamma)值。 The area dimming system 100 of this embodiment may include a light shape imitation unit 16 that generates a luminance gain according to a pulse width modulation value (of the time domain filter 15). The area dimming system 100 may further include a pixel compensation unit 17 that performs pixel compensation of the image according to the photometric gain (of the light shape simulation unit 16), thereby generating a compensated image. Photometric gain can be expressed as follows: Photometric gain = (photometric) (-1 / r) where r represents a gamma value.
在一實施例中,於高峰(peaking)模式,對脈寬調變值進行加權(weighting)後再饋至光形模擬單元16。假設於正常(或原始)模式的電流為原始_I,於高峰模式的電流為高峰_I,於正常模式的脈寬調變值為原始_PWM,則於高峰模式的脈寬調變值為高峰_PWM,可表示如下: 其中(高峰_I/原始_I)代表高峰權重。 In one embodiment, in the peaking mode, the pulse width modulation value is weighted and then fed to the light shape simulation unit 16. Assuming the current in the normal (or original) mode is original_I, the current in the peak mode is peak_I, and the pulse width modulation value in the normal mode is original_PWM, then the pulse width modulation value in the peak mode is Peak_PWM can be expressed as follows: (Peak_I / Original_I) represents the peak weight.
本實施例之區域調光系統100可包含誤差擴散(error diffusion)單元18,用以對補償影像執行誤差擴散。誤差擴散可藉由刪除(truncate)至少一個最低有效位元(LSB)來達成,例如將14位元的補償影像經位元刪除後成為12位元。藉此,可有效降低輪廓(contour)效應以增進影像品質。The area dimming system 100 of this embodiment may include an error diffusion unit 18 for performing error diffusion on the compensated image. Error diffusion can be achieved by truncating at least one least significant bit (LSB). For example, a 14-bit compensation image is deleted into 12 bits. This can effectively reduce the contour effect to improve the image quality.
以上所述僅為本發明之較佳實施例而已,並非用以限定本發明之申請專利範圍;凡其它未脫離發明所揭示之精神下所完成之等效改變或修飾,均應包含在下述之申請專利範圍內。The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of patent application of the present invention; all other equivalent changes or modifications made without departing from the spirit disclosed by the invention should be included in the following Within the scope of patent application.
100‧‧‧區域調光系統100‧‧‧area dimming system
11‧‧‧平均估算單元11‧‧‧ average estimation unit
111‧‧‧最大亮度單元111‧‧‧Maximum brightness unit
112‧‧‧直方圖單元112‧‧‧ Histogram Unit
113‧‧‧權重控制單元113‧‧‧weight control unit
12‧‧‧脈寬調變增益控制單元12‧‧‧Pulse width modulation gain control unit
13‧‧‧空間濾波器13‧‧‧spatial filter
14‧‧‧場景改變偵測單元14‧‧‧Scene change detection unit
15‧‧‧時域濾波器15‧‧‧Time Domain Filter
16‧‧‧光形模擬單元16‧‧‧light shape simulation unit
17‧‧‧像素補償單元17‧‧‧pixel compensation unit
18‧‧‧誤差擴散單元18‧‧‧ Error Diffusion Unit
HGL‧‧‧直方圖灰階HGL‧‧‧ Histogram Grayscale
Mean‧‧‧平均值Mean‧‧‧ average
第一圖顯示本發明實施例之適用於液晶顯示器的發光二極體背光的區域調光系統的方塊圖。 第二圖的示意圖例示決定影像每一像素的最大亮度。 第三圖的示意圖例示根據影像的直方圖以產生直方圖平均值。 第四A圖至第四C圖例示脈寬調變增益值與平均值的關係曲線。 第五A圖例示脈寬調變增益值。 第五B圖例示空間濾波器的要素,其相應於第五A圖的脈寬調變增益值。The first figure shows a block diagram of an area dimming system suitable for a light emitting diode backlight of a liquid crystal display according to an embodiment of the present invention. The schematic diagram of the second figure illustrates determining the maximum brightness of each pixel of the image. The schematic diagram of the third figure illustrates histogram generation from an image to generate a histogram average. The fourth graphs A to C illustrate the relationship between the pulse width modulation gain value and the average value. The fifth A diagram illustrates the pulse width modulation gain value. The fifth diagram B illustrates the elements of the spatial filter, which correspond to the pulse width modulation gain values of the fifth diagram A.
Claims (17)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW107133055A TWI677861B (en) | 2018-09-19 | 2018-09-19 | Local dimming system adaptable to a backlight of a display |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW107133055A TWI677861B (en) | 2018-09-19 | 2018-09-19 | Local dimming system adaptable to a backlight of a display |
Publications (2)
Publication Number | Publication Date |
---|---|
TWI677861B true TWI677861B (en) | 2019-11-21 |
TW202013332A TW202013332A (en) | 2020-04-01 |
Family
ID=69189039
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW107133055A TWI677861B (en) | 2018-09-19 | 2018-09-19 | Local dimming system adaptable to a backlight of a display |
Country Status (1)
Country | Link |
---|---|
TW (1) | TWI677861B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI782687B (en) * | 2021-09-01 | 2022-11-01 | 大陸商北京集創北方科技股份有限公司 | Brightness adjustment method of OLED display panel, OLED display device, and information processing device |
TWI789158B (en) * | 2021-12-10 | 2023-01-01 | 瑞昱半導體股份有限公司 | Image processing method, image processing system, and non-transitory computer readable storage medium |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101312017A (en) * | 2007-05-22 | 2008-11-26 | 香港应用科技研究院有限公司 | Image display apparatus and its image display process |
TW200933575A (en) * | 2008-01-24 | 2009-08-01 | Ind Tech Res Inst | Backlight control apparatus and method thereof for controlling backlight device |
CN101826282A (en) * | 2010-04-16 | 2010-09-08 | 北京巨数数字技术开发有限公司 | Liquid crystal display device and processing method of digital image signal |
US7843422B1 (en) * | 2005-11-29 | 2010-11-30 | National Semiconductor Corporation | Apparatus and method for ambient light compensation for backlight control in small format displays |
TW201120503A (en) * | 2009-12-15 | 2011-06-16 | Lg Display Co Ltd | Liquid crystal display and method of driving the same |
TW201205543A (en) * | 2010-07-20 | 2012-02-01 | Mstar Semiconductor Inc | Backlight control circuit and method thereof |
US20180090077A1 (en) * | 2016-03-15 | 2018-03-29 | Wuhan China Star Optoelectronics Technology Co., Ltd. | Liquid crystal display apparatus and backlight control method thereof |
-
2018
- 2018-09-19 TW TW107133055A patent/TWI677861B/en active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7843422B1 (en) * | 2005-11-29 | 2010-11-30 | National Semiconductor Corporation | Apparatus and method for ambient light compensation for backlight control in small format displays |
CN101312017A (en) * | 2007-05-22 | 2008-11-26 | 香港应用科技研究院有限公司 | Image display apparatus and its image display process |
TW200933575A (en) * | 2008-01-24 | 2009-08-01 | Ind Tech Res Inst | Backlight control apparatus and method thereof for controlling backlight device |
TW201120503A (en) * | 2009-12-15 | 2011-06-16 | Lg Display Co Ltd | Liquid crystal display and method of driving the same |
CN101826282A (en) * | 2010-04-16 | 2010-09-08 | 北京巨数数字技术开发有限公司 | Liquid crystal display device and processing method of digital image signal |
TW201205543A (en) * | 2010-07-20 | 2012-02-01 | Mstar Semiconductor Inc | Backlight control circuit and method thereof |
US20180090077A1 (en) * | 2016-03-15 | 2018-03-29 | Wuhan China Star Optoelectronics Technology Co., Ltd. | Liquid crystal display apparatus and backlight control method thereof |
Also Published As
Publication number | Publication date |
---|---|
TW202013332A (en) | 2020-04-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5570791B2 (en) | Display device driving method | |
JP4203081B2 (en) | Image display device and image display method | |
TWI439996B (en) | Method for adjusting a backlight of a display device and device thereof | |
TWI428898B (en) | Backlight control circuit and method thereof | |
JP4979776B2 (en) | Image display device and image display method | |
CN105448245B (en) | Backlight illumination compensation method and display device | |
JP5127321B2 (en) | Image display device, image display method, and image display program | |
JP5734580B2 (en) | Pixel data correction method and display device for performing the same | |
JP5121647B2 (en) | Image display apparatus and method | |
JPWO2009054223A1 (en) | Image display device | |
JP2012237972A (en) | Temperature estimation device, control method thereof and image display device | |
JP2008076755A (en) | Image display device and image display method | |
US9659519B2 (en) | Video-display control device for correcting a video signal and controlling a backlight | |
WO2018036084A1 (en) | Oled pwm driving method | |
US7839362B2 (en) | Sticking phenomenon correction method, self-luminous apparatus, sticking phenomenon correction apparatus and program | |
TWI677861B (en) | Local dimming system adaptable to a backlight of a display | |
KR20150078025A (en) | Method And apparatus Controlling Luminance Of Organic Light Emitting Diode Display Device | |
US10802333B2 (en) | Local dimming system and method adaptable to a backlight of a display | |
US10600370B2 (en) | Local dimming system adaptable to a backlight of a display | |
JP2010113099A (en) | Display device and display control method | |
CN111009219B (en) | Local dimming system suitable for display backlight | |
US9288426B2 (en) | Video display control device | |
TWI672534B (en) | Local dimming system and method adaptable to a backlight of a display | |
CN114648962B (en) | Device for driving backlight assembly and device for driving display device | |
CN111009220B (en) | Local dimming system and method suitable for display backlight |