CN102243855B - Integrated backlight dimming method and device for enhancing liquid crystal display contrast ratio - Google Patents

Integrated backlight dimming method and device for enhancing liquid crystal display contrast ratio Download PDF

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CN102243855B
CN102243855B CN 201110246263 CN201110246263A CN102243855B CN 102243855 B CN102243855 B CN 102243855B CN 201110246263 CN201110246263 CN 201110246263 CN 201110246263 A CN201110246263 A CN 201110246263A CN 102243855 B CN102243855 B CN 102243855B
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liquid crystal
backlight
dimming
contrast
board
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CN102243855A (en
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冯奇斌
童浩
吕国强
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合肥工业大学
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Abstract

本发明公开了一种用于液晶显示背光源的整体调光方法,包括对输入图像进行统计分析,获得背光调光因子k(0≤k≤1),根据k整体改变背光亮度,同时根据图像特征值生成S曲线,根据S曲线对每个液晶像素进行单独补偿,亮度大于S曲线拐点的像素补偿因子大于1,亮度小于S曲线拐点的像素补偿因子小于1,有效提高显示对比度的同时降低能耗。 The present invention discloses a method for the overall dimming backlight liquid crystal display, comprising a statistical analysis of the input image to obtain a backlight dimming factor k (0≤k≤1), the overall brightness of the backlight changes according to k, while the image generating a feature value S-curve, curve S according to each individual liquid crystal pixel compensation, the brightness is greater than the inflection point of the S-curve pixel compensation factor is greater than 1, brightness is less than an inflection point of the S pixel compensation factor is less than 1, to effectively improve the contrast of the display can be reduced while consumption. 本发明还公开了一种具有全局调光功能的背光装置,包括LED光源板、视频信号接口板、LED驱动板、可编程逻辑(FPGA)控制板等。 The present invention also discloses a backlight device having a global dimming function, includes an LED light source panel, the video signal interface board, LED driver board, programmable logic (FPGA) control board. 本发明提出的调光算法既可改善动态对比度,也可有效提高静态对比度;既可用于直下式背光也可用于侧出式背光。 Dimming algorithm proposed in the present invention can improve the dynamic contrast can be effectively improved static contrast; both for the direct type backlight can be used a side-type backlight.

Description

一种用于提高液晶显示对比度的背光整体调光方法和装置 A method for improving the liquid crystal display apparatus and method of a light overall tone contrast backlight

技术领域 FIELD

[0001] 本发明涉及液晶显示技术领域,特别是一种用于提高液晶显示对比度的背光整体调光方法和装置。 [0001] The present invention relates to a liquid crystal display technology, in particular for improving a liquid crystal display backlight dimming method and apparatus overall contrast.

背景技术 Background technique

[0002] 液晶显示(Liquid Crystal Display, L CD)经过三十年的发展,已经成为平板显示的主流技术。 [0002] LCD (Liquid Crystal Display, L CD) After three years of development, has become a mainstream technology for flat panel displays. 液晶分子本身不发光,需要背光照亮显示区域。 Liquid crystal molecules themselves do not emit light, needs backlit display region. 目前使用的LCD背光源主要有冷阴极突光灯(Cold Cathode Fluorescent, CCFL)和发光二极管(Light EmittingDiode, LED)两种。 LCD backlight currently used mainly cold cathode projecting light (Cold Cathode Fluorescent, CCFL) and a light emitting diode (Light EmittingDiode, LED) two kinds. LED具有寿命长、绿色环保、响应时间快等优点,在液晶显示领域的应用正逐步扩大。 LED having a long life, environmental protection, fast response time, etc., applications in the field of liquid crystal display is gradually expanding.

[0003] 液晶显示存在两个固有缺点:(1)对比度低;(2)功耗大。 [0003] The liquid crystal display has two inherent disadvantages: (1) low contrast ratio; (2) high power consumption. 目前很多研究者采用背光动态调光技术改善液晶显示对比度,同时降低能耗。 At present, many researchers use dynamic backlight dimming technology to improve the contrast of the liquid crystal display, while reducing power consumption. 根据背光亮度调整方法可将动态调光技术分为全局调光和局部调光。 The backlight luminance adjusting method of the dynamic dimming may be divided into global dimming technique local dimming. 全局调光是整体改变背光亮度,局部调光则是将背光分为若干个可以单独控制的区域,根据该区域对应图像的特征值确定这个区域的背光亮度。 An overall change in the global dimming backlight brightness, the backlight local dimming sucked into a plurality of individually controllable regions, the backlight luminance value is determined according to the characteristics of the region corresponding to the region of the image. 相对于区域调光,全局调光不需要对背光进行分区设计、控制,所需控制芯片少,硬件成本低。 With respect to the local dimming, the backlight is not necessary to global dimming partition design, control, and less control chip, low-cost hardware required. 由于不需要分区,不存在目前区域调光方法中存在的光线串扰问题。 Since no partitions, there is no crosstalk light dimming region currently exist. 全局调光还有一个突出的好处是既能够在直下式背光也能够在侧出式背光中实现,能够同时满足体积轻薄、对比度高、能耗低的要求。 The global dimming there is a prominent advantage can be realized both to the direct type backlight in the backlight side can be simultaneously satisfied thin volume, high contrast, low power consumption requirements.

[0004] 福州大学提出的发明专利“LED背光源整体调光的方法及其装置”(申请号:200910309165. 6)需要预设背光源调光失真度,根据这个失真度对图像进行压缩,同时结合外界亮度确定背光调光参数。 Proposed [0004] Fuzhou University patented invention "method and apparatus for dimming the entire LED backlight" (application number: 2009103091656) requires a backlight dimming preset distortion, the image is compressed according to this distortion, while binding backlight dimming determining brightness of an outside parameter. 该发明不对液晶像素灰度进行任何调节,可以适当提高动态对比度,但无法提高静态对比度。 The invention does not make any adjustment of the liquid crystal pixel gray can be appropriately improved dynamic contrast, but can not improve static contrast.

[0005] 广州创维平面显示科技有限公司提出的发明专利“侧光式LED背光动态分区控制方法”(申请号:201010510536.X)提出了一种能够用于侧出式背光的区域调光方法。 [0005] Display Technology Co., Canton SKYWORTH flat proposed patent "edge-lit LED backlight dynamic partition control methods" (application number: 201010510536.X) proposed a method capable of local dimming for a type backlight side. LED设置在导光板的四个侧面,横纵方向LED交叉的区域为这些LED的控制区域,以此实现局部调光。 LED light guide plate disposed on four sides, intersecting horizontal and vertical direction of the LED region of these LED control region, in order to achieve local dimming. 该发明在侧出式背光上实现了区域调光,和本发明的全局调光不同,也不适用于直下式LED背光。 The invention achieves the dimming area, and the global dimming the present invention differ in the upper side of the backlight, a direct type does not apply to the LED backlight.

[0006] 青岛海信电器股份有限公司获得授权的发明专利“液晶显示对比度的调整方法和装置”(申请号:200710111510. 6)提出了一种能够提高液晶显示动态对比度的方法,背光调光因子确定后,对所有液晶像素采取相同的调整系数进行调整,该方法能够提高液晶显示动态对比度,无法提高静态对比度。 [0006] Hisense Electric Co. authorized patent "liquid crystal display apparatus and a method for adjusting contrast" (application number: 2007101115106) proposes a method can improve dynamic contrast liquid crystal display, backlight dimming factor determination after taking all the pixels of the liquid crystal of the same adjustment factor is adjusted, the method can improve dynamic contrast liquid crystal display, can not improve static contrast.

[0007] 本发明提出的LED背光全局调光方法,即可用于直下式背光又可用于侧出式背光,适用范围广。 [0007] LED backlight global dimming method proposed by the present invention, can be used for the direct type backlight but also for the backlight side, a wide range. 针对目前大多数调光算法只能提高液晶显示动态对比度的效果,本发明既可提高动态对比度,还可有效提高静态对比度。 Most algorithms for dimming can improve dynamic contrast effect of the liquid crystal display, the present invention can improve dynamic contrast, may improve static contrast.

发明内容[0008] 本发明的目的在于提供一种用于液晶显示的LED背光的全局调光方法,该方法既解决了现有调光算法无法改善静态对比度的问题,同时又具有控制通道少、硬件成本低、没有光线串扰等优点,适用于直下式背光和侧出式LED背光。 SUMMARY OF THE INVENTION [0008] The object of the present invention to provide a method of global dimming an LED backlight for a liquid crystal display, which not only solves the dimming algorithm can not improve static contrast problems, while having fewer control channels, hardware cost is low, no light crosstalk, etc., and applied to a direct type backlight side of the LED backlight.

[0009] 本发明的另一目的在于提供一种有助于提高液晶显示静态对比度和动态对比度的背光装置,以解决液晶显示对比度不高、能耗大的问题。 [0009] Another object of the present invention is to provide a liquid crystal display help improve static contrast dynamic contrast and backlight device, a liquid crystal display to solve the contrast ratio is not high, the problem of large power consumption.

[0010] 为实现上述目的,本发明采用如下技术方案: [0010] To achieve the above object, the present invention adopts the following technical solution:

[0011] 一种液晶显示背光源全局调光方法,包括以下步骤: [0011] A liquid crystal display backlight global dimming method, comprising the steps of:

[0012] A :对输入图像进行统计分析; [0012] A: Statistical analysis of the input image;

[0013] B :确定背光调光因子k ; [0013] B: a backlight dimming factor K is determined;

[0014] C :确定S曲线拐点亮度&,确定S曲线方程中参数J和a ; [0014] C: determining the knee of the curve S & luminance, determining the S-curve equation parameters J and a;

[0015] D :生成S曲线; [0015] D: S curve generated;

[0016] E :根据k生成背光亮度脉宽调制(PWM)信号值,整体调整背光亮度;根据调光因子k生成背光LED脉宽调制(PWM)信号,送入LED驱动板; [0016] E: k backlight luminance generating a pulse width modulation (PWM) signal value, to adjust the overall brightness of the backlight in accordance with; k generated according to backlight dimming factor LED pulse width modulation (PWM) signal, sent to the LED driving board;

[0017] F :根据S曲线调整每个像素亮度,将调整后的信号通过液晶屏接口板送入液晶控制板。 [0017] F: The S curve adjusting luminance of each pixel, the adjusted signal into the liquid crystal panel LCD screen interface board.

[0018] 一种有助于提高液晶显示静态对比度和动态对比度的背光装置,包括 [0018] A liquid crystal display help improve static contrast dynamic contrast and backlight device, comprising

[0019] A :LED光源板,不需要分区,可以是直下式,也可以是侧出式; [0019] A: LED light source panel, the partition does not need to be direct type, may be a side-through;

[0020] B =LED驱动板,接收来自FPGA控制板的信号,产生LED需要的脉宽调制(PWM)驱动信号,实时调整LED光源板上每个LED的发光亮度; [0020] B = LED driving board receives a signal from the FPGA control board, generating a pulse width modulation (the PWM) driver for LED signals in real time to adjust the emission luminance of each LED light source LED board;

[0021] C :视频信号接口板,用于接收视频信号; [0021] C: a video signal interface board for receiving a video signal;

[0022] D :可编程逻辑(FPGA)控制板,接收来自视频信号接口板的信号,根据全局调光算法产生LED驱动信号和液晶像素亮度调整信号; [0022] D: programmable logic (FPGA) board, receiving a signal from the video interface board generates the LED driving signals and a liquid crystal pixel luminance adjustment signal according to the global dimming algorithm;

[0023] E :液晶屏接口板,接收来自可编程逻辑(FPGA)控制板的信号,产生液晶屏驱动信号; [0023] E: LCD interface board, the control board receives a signal from the programmable logic (the FPGA), generates a driving signal of the liquid crystal panel;

[0024] F :电源板,输入为交流市电,为各电路板提供所需直流电压。 [0024] F: power supply board, input AC power, to provide the required DC voltage for each circuit board.

[0025] 本发明有益效果在于:LED背光源不需要进行分区设计和控制,控制通道少、硬件成本低;不存在影响显示质量的区域间光线串扰问题。 Advantageous Effects [0025] The present invention is characterized: LED backlight does not need to partition the design and control, low control channel, hardware cost is low; between display region is not influenced by mass crosstalk light. 本全局调光方法对直下式和侧出式LED背光均适用,既可提高动态对比度,又可有效提高静态对比度。 This global dimming method and the side of the direct type LED backlight are applicable, can improve dynamic contrast, but also effectively improve static contrast.

附图说明 BRIEF DESCRIPTION

[0026] 图I是本发明的装置框图。 [0026] Figure I is a block diagram of an apparatus according to the present invention.

[0027] 图2是本发明全局调光方法流程图。 [0027] FIG 2 is a flowchart of global dimming method of the present invention.

[0028] 图3是本发明输入图像统计图,a是柱状图,b是累计柱状图。 [0028] FIG. 3 is a chart of the input image according to the present invention, a is a bar graph, b is the cumulative histogram.

[0029] 图4是本发明原始的S曲线。 [0029] FIG. 4 is the original S-curve of the present invention.

[0030] 图5是本发明用于提高对比度的S曲线。 [0030] FIG. 5 of the present invention is to improve the contrast of the S-curve.

[0031 ] 图6是本发明的背光装置实例I。 [0031] FIG. 6 is an example of a backlight apparatus according to the present invention I.

[0032] 图7是本发明的背光装置实例2。 [0032] FIG. 7 is an example of the backlight device 2 of the present invention.

具体实施方式[0033] 本发明的核心在于提供一种有效提高液晶显示动态对比度和静态对比度的方法,该方法不需要对背光进行分区,对输入视频信号进行统计分析后,生成调光后的背光亮度值。 DETAILED DESCRIPTION [0033] The core of the invention is to provide a liquid crystal display method for dynamic contrast and improve static contrast, which does not require partitioning backlight, the backlight of the statistical analysis of the input video signal, adjusting the light generated luminance value. 同时根据S曲线对液晶各子像素亮度进行调整。 At the same time be adjusted according to the brightness of the sub-pixels S curve.

[0034] 请参见图I的装置框图。 [0034] Referring to Figure I is a block diagram of apparatus. 背光装置I包括LED光源板101、LED驱动板102、视频信号接口板103、可编程逻辑(FPGA)控制板104、液晶屏接口板105和电源板106。 The backlight device I includes an LED light source panel 101, LED driving board 102, the video signal interface board 103, a programmable logic (FPGA) board 104, LCD interface board 105 and power board 106. LED光源板101可以是直下式,也可以是侧出式。 LED light source panel 101 may be a direct type, may be a side-through. 视频输入信号首先进入视频信号接口板103进行解码,解码后的信号进入可编程逻辑(FPGA)控制板104。 Video input signal into the first video signal interface board 103 is decoded, the decoded signal into the programmable logic (FPGA) board 104. 可编程逻辑(FPGA)控制板104包括可编程逻辑控制器FPGA、存储器等芯片,可编程逻辑(FPGA)分析来自视频信号接口板103的输出信号,根据全局调光算法产生LED亮度调整信号和液晶各像素亮度调整信号,分别输入LED驱动板102和液晶屏接口板105。 Programmable logic (FPGA) board 104 comprises the FPGA programmable logic controller, memory chips, programmable logic (FPGA) analyzing the output signal from the video interface board 103, the LED luminance adjusting signal is generated and the liquid crystal according to a global dimming algorithm each pixel luminance adjustment signal, respectively inputted LED driving board 102 and the liquid crystal screen interface board 105. 电源板106接收交流市电,为各电路板提供需要的直流电压。 Power board 106 receives AC power, a DC voltage required for the circuit board.

[0035] 请参见图2的可编程逻辑(FPGA)控制板104中实现的全局调光方法流程图。 [0035] Referring to FIG 2 the programmable logic flowchart global dimming method (FPGA) board 104 implemented. 首先对来自视频信号接口板103的输出信号进行分析处理,得到整帧图像的像素灰度最大值、子像素红(R)、绿(G)、蓝(B)各颜色最大亮度值、灰度平均值、颜色亮度平均值等特征参数,确定背光亮度调光因子I如下式所示: First, the output signal from the video interface board 103 is analyzed to give a maximum pixel grayscale image of the entire frame, the sub-pixels of red (R), green (G), blue (B) color maximum luminance value of each gradation the average value of the characteristic parameters, the average brightness of the color, etc., to determine the backlight brightness dimming factor shown in the following formula I:

Figure CN102243855BD00051

[0037] 式中,怂是调光因子初始值,可以选O. 5,0. 75或其他值。 [0037] In the formula, counseling dimming factor is the initial value, may be selected from O. 5,0. 75 or other values. b是图像对背光亮度的影响系数,其取值要考虑初始值怂,保证々在(0,I)范围内。 b is an influence coefficient of backlight brightness image, the value of the initial value to consider counseling, ensure 々 within (0, I) range. 例如,当&取O. 5时,6=510,当夂取O. 75时,6=1020。 For example, when taking & O. 5, 6 = 510, when taken Fan O. 75 when 6 = 1020.

[0038] 可以采用多种方法确定Zw„。方程2给出了几种确定的方法。第一种实例是采取各子像素R、G、B亮度最大值的方法。第二实例是采取各子像素灰度最大值的方法。第三实例是首先取出各像素R、G、B亮度最大值,然后对所有像素最大值进行平均运算的方法。第四实例是首先计算各子像素的灰度值,对所有像素灰度值进行平均运算: [0038] Various methods may be employed to determine Zw. "Equation 2 is given in several ways to determine. The first example is to take the sub-pixels R, G, B luminance maximum value method. The second example is to take each of the sub maximum pixel intensity method. the third example is first removed respective pixels R, G, B luminance maximum, and average maximum value for all pixels calculation method. the fourth example is first calculated for each sub-pixel gradation values , averaging operation on all pixel grayscale values:

Figure CN102243855BD00052

[0040] 背光调整因子A确定后,根据A生成LED背光的PWM驱动信号。 [0040] After backlight adjustment factor A is determined, PWM drive signal A generated LED backlight. 设背光没有调光前PWM信号的占空比为R1,调光后生成的PWM信号占空比为R2,则R2=R1 X k ; Adjusting the duty ratio of the backlight is not provided before the optical signal is PWM R1, generated after the dimming duty cycle of the PWM signal R2, then R2 = R1 X k;

[0041] 由于k总是小于或等于1,故调光后背光亮度也总是小于或等于调光前的背光亮度,降低了能耗。 [0041] Since k is always less than or equal to 1, so that the luminance of the backlight dimming is always less than or equal backlight luminance before tone light, energy consumption is reduced.

[0042] 背光亮度确定后,为补偿背光亮度的降低和提高对比度,需要对液晶像素亮度进行调整。 After [0042] the backlight brightness determined, in order to reduce and compensate for the backlight brightness to improve the contrast of the liquid crystal pixel brightness needs to be adjusted. 不同于以往的对所有像素采取相同调整幅度的方法,本发明根据S曲线对每个液晶像素亮度进行单独调整,由于每个像素调整幅度不同,有效提高了显示静态对比度。 The conventional method of taking the same adjustments to all the pixels is different from the present invention be adjusted individually for each of the S-curve according to the brightness of the pixel, because each pixel adjustment, improve static contrast display. S曲线方程如下: S curve equation is as follows:

Figure CN102243855BD00061

[0044] S曲线方程包括J和a两个参数,其中J和a的关系如下式所示: [0044] S J and a curve equation includes two parameters, wherein a relationship between J and shown in the following formula:

Figure CN102243855BD00062

[0046] 式中&是S曲线拐点坐标。 [0046] where S is the knee of the curve & coordinate. S曲线拐点&决定了对比度的调整范围,如图5所示,亮度大于&的像素调整因子大于1,亮度小于&的像素调整因子小于I。 S & determines the knee of the curve of the contrast adjustment range, shown in Figure 5, the luminance adjustment factor greater than & pixel is greater than 1, the pixel brightness is less than the adjustment factor is less than & I. 为保证调光算法适用于各种图像,S曲线拐点&由输入图像决定,可以是累计柱状图中包括所有像素一定比例(如50%)对应的亮度值,也可以取图像所有像素平均灰度值。 To ensure the dimming algorithm applied to various image, S & inflection curve determined from the input image, all pixels may be a certain percentage (e.g., 50%) corresponding to the luminance value of the cumulative histogram, can take all the gray scale image pixel averaging value. [0047] 请参阅图3曲线。 [0047] Please refer to FIG. 3 curve. 图3(a)是图像的统计柱状图,图3 (b)是图像的累计柱状图。 FIG. 3 (a) is a statistical histogram of the image, FIG. 3 (b) is an accumulated histogram of the image. Map

3 (a)中Nmax和Nmin分别是柱状图中数量最多和最少对应的亮度值。 3 (a) of the Nmax and Nmin are respectively the maximum number of minimum luminance value and a corresponding histogram. 图3 (b)中H25、H50, H75分别是累计柱状图中包括所有像素25%、50%和75%的对应的亮度值。 FIG 3 (b) in H25, H50, H75 are all pixels included in the cumulative histogram 25%, 50% and 75% corresponding to the luminance values. &可以由图3中得到的特征值确定。 & Obtained by the feature value may FIG 3 is determined. 确定方法有多种形式,下式给出了5种可能的取值方法: The method of determining a variety of forms, given five possible values ​​Method:

Figure CN102243855BD00063

[0049] &确定后,取a=0.22,根据方程4可以得到儿由此根据方程3得到S曲线。 [0049] & OK, take a = 0.22, children can be obtained according to Equation 4 S curve thus obtained according to Equation 3. 图4是根据方程3得到的原始的S曲线,其原点和终点不通过(0,O)和(255,255)两点,无法对液晶像素亮度进行补充,故需要对曲线进行平移和拉伸,得到图5的S曲线。 FIG 4 is a curve of the original S 3 resulting equation, which does not pass through the origin and end point (0, O), and (255, 255) points, the brightness of the liquid crystal pixel can not be added, they need to be translated and the tensile curve to give 5 S curve of FIG. 图5给出了3条典型的S曲线。 Figure 5 shows a typical S curve 3. 图5a是对于比较暗的图像,其拐点亮度较低,故对灰度较低的像素调整较少,以避免较暗部分的图像失真。 Figure 5a is an image for the relatively dark, low luminance inflection point, so the low gradation pixel less adjustment to avoid image distortion dark portion. 图5b是对于比较亮的图像,其拐点亮度较高,故对灰度较高的像素调整较少,以避免较亮部分的图像失真。 FIG 5b is a relatively bright image for which the luminance knee high, so the high gradation pixel less adjustment to avoid image distortion of the lighter portions. 图5c是对于亮度比较适中的图像,其拐点亮度居中,对于灰度较低和较高的的像素均进行调整,提高对比度。 FIG. 5c is relatively modest for a luminance image, which luminance knee center, for low and high gradation pixel are adjusted to improve the contrast. 获得S曲线后,根据液晶像素原来的亮度值Lin (横坐标)查找对应S曲线的纵坐标输出Lwt,将Lrat送入液晶屏接口板。 After the S-curve is obtained, the original value according to the brightness of the liquid crystal pixel Lin (abscissa) curve to find the corresponding S LWT output ordinate, Lrat into the LCD interface board.

[0050] 请参阅图6所示的实施实例I。 [0050] See example embodiment shown in FIG. 6 I. 该实例I是具有全局调光功能的侧出式LED背光装置,包括侧出式LED灯601、导光板602、LED驱动板603、视频信号接口板604、FPGA控制板605、电路板支架606、电源板607和液晶屏接口板608。 Example I is a side showing the LED backlight device having a global dimming function, comprising a lateral type LED lamp 601, the light guide plate 602, LED driving board 603, the video signal interface board 604, FPGA control board 605, the board support 606, power supply board 607 and the LCD screen interface board 608. 由于采用侧出方式,需要的LED数量少,所有电路板可以布置在电路板支架606的一面。 As a result of the lateral mode, needs a small number of the LED, the circuit board may be arranged all on one side of the circuit board 606 of the bracket.

[0051] 请参阅图7所示的实施实例2。 [0051] The embodiment shown in FIG. 7 See Example 2. 该实例2是具有全局调光功能的直下式LED背光装置,包括直下式LED灯701、FPGA控制板702、视频信号接口板703、LED驱动板704、电路板支架705、电源板706和液晶屏接口板707。 Example 2 The direct type LED backlight device having a global dimming function, including direct type LED lamp 701, FPGA control board 702, the video signal interface board 703, LED driving board 704, the circuit board bracket 705, the power board 706 and the liquid crystal panel 707 interface board. 由于采用直下方式,需要的LED数量较多,LED驱动板704上需要布置较多驱动芯片,可能导致LED驱动板704尺寸较大,所有电路板无法布置在电路板支架705的相同面,故电路板安装在电路板支架705的两面。 As a result of the direct mode, the LED requires a large number, more needs to be arranged on the LED driving board driving chip 704, the LED driving board 704 may result in a larger size, not all the circuit boards arranged in the same side of the board holder 705, so that the circuit plate mounting bracket 705 on both sides of the circuit board. 图7中虚线表示的电路板和信号走线在电路板支架705的距离LED灯701较远的一面,距离LED灯701较近的一面安装LED驱动板704。 From FIG. 7 and the signal traces of the circuit board in a dotted line in the circuit board rack 705 LED lamp 701 farther side from the LED 701 near the mounting side of the LED driving board 704.

[0052] 由以上本发明的实施实例可见,本发明的背光装置可以是侧出式,也可以是直下式。 [0052] Examples of the above embodiment seen from the present invention, the backlight device according to the present invention may be a side-through, may be a direct type. LED光源板不需要进行分区设计、控制,节约了硬件成本和开发时间,克服了分区控制无法避免的光线串扰问题。 LED light source does not need to partition plate design, control, saving hardware cost and development time, to overcome the problem of crosstalk zone control light can not be avoided. 本发明中包括的FPGA控制板,能够根据输入图像实时调整背光亮度,同时根据S曲线对每个像素亮度值进行调整,亮度值大于拐点的像素调整因子大于1,亮度值小于拐点的像素调整因子小于1,由此有效提高液晶显示静态对比度和动态对比度,同时降低能耗。 The present invention includes an FPGA board, the input image can be adjusted in real time in accordance with the backlight brightness while adjusting the luminance value for each pixel according to the S-curve, the inflection point is greater than the pixel luminance value adjustment factor is greater than 1, the luminance pixel value is less than an inflection point adjustment factor less than 1, thereby effectively improve the contrast of the liquid crystal display static and dynamic contrast while reducing power consumption.

[0053] 虽然通过实例描述了本发明,本领域普通技术人员知道,本发明有许多变形和变化而不脱离本发明的精神,希望所附的权利要求包括这些变形和变化而不脱离本发明的精神。 [0053] While the invention has been described by way of example, those of ordinary skill in the art know that there are many modifications and variations of the present invention without departing from the spirit of the invention, intended that the appended claims cover such modifications and variations are possible without departing from the present invention. spirit.

Claims (2)

1. 一种用于提高液晶显示对比度的背光整体调光方法,其特征在于:所述用于提高液晶显示对比度的背光整体调光方法包括以下步骤: (1)对输入图像进行统计分析; (2)确定背光调光因子k; (3)确定S曲线拐点亮度Lg,确定S曲线方程中参数A和a ; (4)生成S曲线; (5)根据调光因子k生成背景光亮度pwm值,整体调整背景光亮度;根据调光因子k生成背光LED脉宽调制PWM信号,送入LED驱动板; (6)根据S曲线调整每个像素亮度,将调整后的信号通过液晶屏接口板送入液晶控制板。 1. A method for improving the overall dimming the backlight of the liquid crystal display contrast, wherein: said liquid crystal display for improving the overall contrast of the backlight dimming method comprising the steps of: (1) statistical analysis of the input image; ( 2) determining a backlight dimming factor k; (. 3) to determine the S-curve inflection luminance Lg, determining the S-curve equation parameters A and a; (4) generating S curve; (5) generates a background brightness pwm value according to the dimming factor k , to adjust the overall brightness of the background light; k generated according to backlight dimming factor LED pulse width modulated PWM signal, fed to the LED driving board; (6) according to the S-curve signal adjusting luminance of each pixel, the LCD screen will be adjusted by the interface board to send the liquid crystal panel.
2.根据权利要求I所述的一种用于提高液晶显示对比度的背光整体调光方法,其特征在于:所述用于提高液晶显示对比度的背光整体调光装置既有助于提高液晶显示动态对比度,也有助于提高液晶显示的静态对比度,该装置包括: LED光源板(101):不需要分区,可以是直下式,也可以是侧出式; LED驱动板(102):接收来自可编程逻辑控制板(104)的信号,产生LED需要的脉宽调制驱动信号,实时调整LED光源板(101)上每个LED的发光亮度; 视频信号接口板(103):用于接收视频信号; 可编程逻辑控制板(104):接收来自视频信号接口板(103)的信号,根据全局调光算法产生LED驱动信号和液晶像素亮度调整信号; 液晶屏接口板(105):接收来自可编程逻辑控制板(104)的信号,产生液晶屏驱动信号;电源板(106):输入为交流市电,为各电路板提供所需直流电压。 The I for improving the overall dimming the backlight of the liquid crystal display contrast claim, wherein: said means for improving the contrast of the liquid crystal display backlight dimming entire liquid crystal display device helps to improve both the dynamic contrast, also help to improve static contrast of a liquid crystal display, the apparatus comprising: LED light source panel (101): no partition, may be of direct type, or may be a lateral type; the LED driving board (102): receiving from the programmable logic control board (104) signal, generates a pulse width modulated LED drive signals required, real-time adjustment of each light emission luminance of the LED on the LED light source plate (101); a video signal interface board (103): means for receiving a video signal; a programming logic control board (104): receiving a signal from the video interface board (103) generates the LED driving signals and a liquid crystal pixel luminance adjustment signal according to the global dimming algorithm; LCD interface board (105): receiving a control from the programmable logic plate (104) signal, a drive signal to a liquid crystal panel; power supply board (106): input AC power, to provide the desired DC voltage for the circuit board.
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