CN101303839A - Liquid crystal display device and image display method thereof - Google Patents

Liquid crystal display device and image display method thereof Download PDF

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CN101303839A
CN101303839A CN 200810003027 CN200810003027A CN101303839A CN 101303839 A CN101303839 A CN 101303839A CN 200810003027 CN200810003027 CN 200810003027 CN 200810003027 A CN200810003027 A CN 200810003027A CN 101303839 A CN101303839 A CN 101303839A
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regions
liquid crystal
light
emission luminance
plurality
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大岛芳则
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日本胜利株式会社
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Abstract

A backlight device is divided into multiple regions, and has a configuration in which light emitted from a light source of each of the regions is allowed to leak to other regions. A maximum gradation detector detects a maximum gradation of a regional image signal displayed on each of the regions of the liquid crystal panel. An image gain calculator obtains a gain to be multiplied to each regional image signal. An emission luminance calculator obtains an emission luminance of light to be emitted by each light source, by using an operation expression according to the emission luminance of light to be emitted by the backlight device. At this time, if the emission luminance takes a negative value as a result of calculation, the emission luminance calculator makes a correction so that the emission luminance can take a value equal to or greater than 0.

Description

液晶显示装置及用于该装置的影像显示方法 The method of the image display apparatus is a liquid crystal display device, and

技术领域 FIELD

本发明涉及一种具有背光装置的液晶显示装置、及控制背光装置中的背光的发光亮度而显示影像信号的影像显示方法。 Brightness light emitting device and a backlight control backlight device of the present invention relates to a liquid crystal display device having a backlight image display method of displaying a video signal.

背景技术 Background technique

在使用液晶面板显示图像的液晶显示装置中,液晶面板自身不发光,因此在液晶面板的例如背面设置背光装置。 In the liquid crystal image display panel using a liquid crystal display device, a liquid crystal panel itself does not emit light, a backlight device is provided, for example, the back surface of the liquid crystal panel. 液晶面板可以通过不施加电压的状态和施加电压的状态,处于将光遮挡的截止状态和使光透过的导通状态。 The liquid crystal panel by the voltage is not applied and a voltage is applied, light blocking in an off state and the ON state of light transmission. 因此,通过控制对液晶面板上设置的多个像素施加电压的状态,从而以电子快门的方式驱动多个像素,对从背光发出的光透过液晶面板的光量进行控制,从而显示图像。 Thus, by controlling a voltage is applied to the plurality of pixels disposed on the liquid crystal panel, thereby driving an electronic shutter of a plurality of pixels manner, controls the light amount of light transmitted through the liquid crystal panel is emitted from the backlight to display an image.

作为在背光装置上使用的背光,以往以冷阴极管(CCFL (Cold Cathode Fluorescent Lamp))为主流,在使用CCFL的背光装置中,一般不管液晶面板上显示的影像信号的明亮度如何,均使CCFL处于恒定的点亮状态。 As a backlight used in a backlight device, a conventional cold cathode tube (CCFL (Cold Cathode Fluorescent Lamp)) as the mainstream, the backlight device using the CCFL, in general, regardless of the brightness of the video signal displayed on the liquid crystal panel, are so CCFL at a constant lighting state.

在液晶显示装置消耗的电力中,背光装置的消耗电力所占的比例大,在背光始终处于恒定的点亮状态的现有的液晶显示装置中,存在消耗电力大的问题。 Power consumption in the liquid crystal display device, the ratio of power consumption of backlight device occupied large, the backlight is always in a constant lighting state of a conventional liquid crystal display device, there is a problem of large power consumption. 为了解决该问题,提出了各种将发光二极管(LED (Light Emitting Diode))用作背光,并可以根据影像信号的明亮度改变LED的发光亮度的方案。 To solve this problem, various light-emitting diodes (LED (Light Emitting Diode)) is used as a backlight, and may change the emission luminance of the LED embodiment according to the brightness of the video signal.

例如在下述非专利文献1及专利文献1〜3中公开了,将具有多个LED的背光装置分割为多个区域,并根据影像信号的明亮度按照每个区域分别控制背光的发光亮度。 For example, disclosed in the following Non-Patent Document 1 and Patent Document 1~3 in, and having a plurality of regions of backlight device is divided into a plurality of LED, and a video signal based on the brightness control the emission luminance of the backlight for each region. 另外,在非专利文献1中,将这种技术称为自适应调光(Adaptive Dimming)。 Further, in Non-Patent Document 1, such a technique referred to as adaptive dimming (Adaptive Dimming).

非专利文献1: T. Shirai, S. Shimizukawa, T. Shiga, and S. Mikoshiba, 44.4: RGB-LED Backlights for LCD-TVs with OD, ID, and 2D Adaptive Dimming, 1520 SID 06 DIGEST Non-Patent Document 1: T. Shirai, S. Shimizukawa, T. Shiga, and S. Mikoshiba, 44.4: RGB-LED Backlights for LCD-TVs with OD, ID, and 2D Adaptive Dimming, 1520 SID 06 DIGEST

专利文献1:日本专利公开2005-258403号公报 Patent Document 1: Japanese Patent Publication No. 2005-258403

专利文献2:日本专利公开2006-30588号公报 Patent Document 2: Japanese Patent Laid-Open Publication No. 2006-30588

专利文献3:日本专利公开2006-145886号公报 Patent Document 3: Japanese Patent Publication No. 2006-145886 Patent Publication

在上述非专利文献1中记载的现有的液晶显示装置中,分割为多个区域的背光装置的各区域被遮挡光的壁隔开,各区域的背光,按照每个区域分别在完全独立的状态下,根据影像信号的明亮度控制发光亮度。 The display device in the conventional liquid crystal described in Non-Patent Document 1, the backlight device is divided into a plurality of regions each region of the partition wall blocks light, the backlight of each region, in each area are completely separate state, based on the brightness of the image signal controlling the light intensity. LED中每个元件的个体决定明亮度和色调的主波长有偏差,对于红(R)、绿(G)、蓝(B)的每种颜色偏差的程度也不相同。 Determined for each individual LED element in a dominant wavelength of the hue and the brightness deviation, for the red (R), green (G), the degree of blue (B) are not the same for each color deviation. 因此,若将背光装置的各区域彼此完全分离,则在每个区域上明亮度和色调产生偏差,其结果,存在液晶面板上显示的影像与本来的影像的状态不同的问题。 Thus, when each region of the backlight device are completely separated from each other, a deviation is generated in each region Shangming luminance and hue, as a result, there are different images and the original state of the image displayed on the liquid crystal panel problem.

LED的明亮度和发光波长具有温度依赖性,特别是R的LED伴随着元件的温度上升,光量减少,波长变长。 LED brightness and light emission wavelength is temperature-dependent, in particular the R LED element following the temperature rise, reducing the amount of light, longer wavelength. 此外,每个R、 G、 B的元件的、由随时间产生的变化引起的劣化的特性不同。 Further, each of the R, G, and B components, different degradation characteristics generated due to the change over time. 因此,上述问题根据LED的元件的温度变化或随时间产生的变化而显著产生。 Accordingly, the above-described problems of the LED elements to changes in temperature or change over time is generated significantly generated.

在将各区域完全分离的结构中,很难确定位于相邻区域的边界上部的像素属于哪个区域。 In each area is completely separate structures, it is difficult to determine the pixel positioned adjacent to the upper boundary region of the region belongs. 这是由于,背光装置的制作精度与液晶面板的制作精度相比非常粗糙。 This is because the manufacturing accuracy of the backlight device manufacturing accuracy is very rough compared to the liquid crystal panel. 因此根本无法采用上述非专利文献1中记载的结构。 Therefore can not use the above-described structure is described in Non-Patent Document 1.

此外,如上述非专利文献1或上述专利文献1〜3的记载,通过采用将背光装置分割为多个区域,并根据影像信号的明亮度按照每个区域分别控制背光的发光亮度的结构,可以削减消耗电力,但是要求进一步削减消耗电力。 Further, as described in Non-Patent Document 1 or Patent Document 1 ~ 3 described above, by using the backlight device is divided into a plurality of regions, and based on the brightness of the picture signal respectively controlling the backlight emission luminance for each region of the structure, reduce power consumption, but requires further reduce power consumption.

发明内容 SUMMARY

本发明考虑到上述问题点,其目的在于提供一种液晶显示装置及用于该装置的影像显示方法,在将背光装置分割为多个区域,并根据影像信号的明亮度,按照每个区域分别控制背光的发光亮度的情况下, 能够抑制每个区域各自的明亮度或色调的偏差,能够提高液晶面板上显示的影像的品质。 The present invention contemplates the above problems, and its object is to provide a liquid crystal display device and a method for an image display device, the backlight device is divided into a plurality of regions, and based on the brightness of the video signal, respectively, each area under the control of the emission luminance of the backlight can be suppressed variation of each hue or brightness for each region, can improve the quality of the image displayed on the liquid crystal panel. 此外,其目的在于提供一种可以进一步削减背光装置的消耗电力的液晶显示装置及用于该装置的影像显示方法。 Further, an object thereof is to provide a further reduction in the power consumption of the backlight device of the liquid crystal apparatus and display method for an image display apparatus.

本发明,为了解决上述现有技术的课题,提供一种液晶显示装置, 其特征在于包括:液晶面板(34),显示影像信号;背光装置(35), 配置在上述液晶面板的背面侧,被划分为多个区域,上述多个区域分别具有发出照射上述液晶面板的光的光源,并且具有允许从上述多个 The present invention, in order to solve problems of the prior art, there is provided a liquid crystal display device, comprising: a liquid crystal panel (34), a video signal display; backlight device (35), disposed on the rear surface side of the liquid crystal panel, is is divided into a plurality of regions, said plurality of regions each having a light source emitting light irradiating the liquid crystal panel and having a plurality of allowed from the

区域各自的光源发出的光漏出到自身区域以外的其他区域的结构;最大灰度检测部(11),按照每个预定的单位时间,对与上述背光装置的多个区域对应的上述液晶面板的多个区域上分别显示的每个区域的影像信号的第一最大灰度进行检测;影像增益运算部(12),求得与用第二最大灰度除以上述第一最大灰度得到的值相当的值,作为对每个上述区域的影像信号的增益,其中所述第二最大灰度是由上述影像信号的位数决定的上述影像信号所取得的;乘法器(14),用每个上述区域的影像信号乘以由上述影像增益运算部求得的上述增益,作为上述液晶面板上显示的影像信号输出;以及发光亮度运算部(22), 在将从上述背光装置中的上述多个区域分别发出的光的亮度设为用上述光源的最大亮度乘以由上述影像增益运算部求得的上述增益的倒数得到的第一发光 The respective light source region leaks into the structure of the light emitted from regions other than the local area; maximum gradation detector unit (11), for each predetermined unit time, the plurality of regions corresponding to the liquid crystal panel and the backlight device value image gain calculator (12), the first maximum is obtained by dividing the second maximum gradation by gradation obtained; a first maximum gradation of each regional image signal displayed on each of the plurality of detection regions value corresponding, for each region as the gain of the video signal, wherein the second maximum gradation of the image signal is determined by the number of bits of the video signal acquired; multiplier (14), with each the video signal of the region multiplied by the gain obtained by the image gain calculator, as a signal output images displayed on the liquid crystal panel; and a light emission luminance calculator (22), from a plurality of the above-described backlight device brightness of the light emitted from each light emitting region is the first of the reciprocal of the gain obtained by multiplying the maximum luminance of the light source obtained by the image gain calculator 亮度,并将上述背光装置中的上述多个区域的光源为得到该第一发光亮度而应该分别单独发出的光的亮度设为第二发光亮度时,利用用上述第一发光亮度乘以第一系数的运算式,求得上述第二发光亮度时,在上述第二发光亮度在计算上为负值的情况下,以使上述第二发光亮度为0以上的值的方式对上述第一发光亮度进行校正后,求得上述第二发光亮度,其中上述第一系数基于从上述多个区域各自的光源发出的光漏出到自身区域以外的其他区域的光量。 When the luminance of light source luminance, and the plurality of regions of the backlight device to obtain the first emission luminance to be individually emitted from the second emission luminance by multiplying a first emission luminance of the first when the coefficient arithmetic expression, the second emission luminance is obtained, in a case where the second emission luminance is calculated on the negative, so that the second embodiment is the emission luminance value of 0 or above a first emission luminance after correction, the second emission luminance is obtained, wherein said first coefficient based on the light emitted from the plurality of source regions of each light leakage amount in regions other than the local area.

在此,优选,上述影像增益运算部,根据已由上述发光亮度运算部校正的上述第一发光亮度,求得上述增益。 In this case, preferably the image gain calculator, based on the first emission luminance by the emission luminance calculation section above correction, the gain is obtained.

此外,优选,上述运算式是矩阵运算式。 Further, preferably, the calculation formula is a matrix equation.

在上述结构中,优选,上述液晶面板的多个区域是将上述液晶面板在垂直方向上一维划分的区域。 In the above configuration, preferably, the plurality of regions of the liquid crystal panel is the liquid crystal panel in the vertical direction one-dimensionally divided regions.

此时,优选包括非均匀处理部(21),用上述背光装置的多个区 In this case, the processing unit preferably includes a non-uniformly (21), a plurality of regions of the backlight device

域各自的上述第一发光亮度乘以第二系数,将上述第一发光亮度变得不均匀,以使从上述液晶面板中的位于一维排列的多个区域的垂直方向的中央部的区域开始到位于上下端部的区域为止,上述液晶面板上的亮度阶梯状地降低。 Domain of each of the first emission luminance by multiplying a second coefficient, the first emission luminance becomes non-uniform, so that the region of the central portion is positioned in the vertical direction one-dimensional arrangement of a plurality of regions of the liquid crystal panel from the start in the region of the upper and lower ends is reached, the luminance stepwise on the liquid crystal panel is reduced.

此外,在上述结构中,优选,上述液晶面板的多个区域是将上述液晶面板在水平方向及垂直方向双方上按二维划分的区域。 Further, in the above structure, preferably, the plurality of regions of the liquid crystal panel is divided into a two-dimensional region on both sides of the liquid crystal panel in the horizontal and vertical directions.

此时,优选包括非均匀处理部(21),用上述背光装置的多个区域各自的上述第一发光亮度乘以第二系数,将上述第一发光亮度变得不均匀,以使从上述液晶面板中的位于二维排列的多个区域的水平方向的中央部的区域开始到位于左右端部的区域为止,上述液晶面板上的亮度阶梯状地降低,并且从位于垂直方向的中央部的区域开始到位于上下端部的区域为止,上述液晶面板上的亮度阶梯状地降低。 In this case, the processing unit preferably includes a non-uniformly (21), a plurality of regions of the backlight device of each of the first emission luminance by multiplying a second coefficient, the first emission luminance becomes non-uniform, so that the liquid crystal from the region of the central portion in the horizontal direction of the plurality of regions located in the two-dimensional array panel to start in the region of the far left and right ends, the luminance stepwise on the liquid crystal panel is reduced, and the region of the central portion in a vertical direction beginning in the region of the upper and lower ends up, stepwise luminance on the liquid crystal panel is reduced.

优选,上述第二系数为0.8以上、lO以下的值。 Preferably, the second coefficient is 0.8 or more, less than lO value. 优选,上述背光装置的上述光源为发光二极管。 Preferably the light source, the backlight device as a light emitting diode.

进而,本发明为了解决上述现有技术的课题,提供一种影像显示方法,其特征在于,将液晶面板上显示的影像信号设为与在上述液晶面板上设定的多个区域对应的每个区域的影像信号,并按照每个预定的单位时间,对在上述多个区域上分别显示的每个区域的影像信号的 Further, the present invention is to solve the problems of the conventional art, there is provided a method of displaying an image, wherein the corresponding video signal to be displayed on the liquid crystal panel with a plurality of regions set on the liquid crystal panel each a video signal area, and for each predetermined unit time, for each region are displayed on said plurality of regions of the video signal

第一最大灰度进行检测,求得与用第二最大灰度除以上述第一最大灰度得到的值相当的值,作为对每个上述区域的影像信号的增益,其中所述第二最大灰度是由上述影像信号的位数决定的上述影像信号所取得的,用每个上述区域的影像信号乘以上述增益,并供给到上述液晶面板,上述液晶面板的背光装置与上述液晶面板的多个区域对应地被划分为多个区域,在将从上述背光装置中的上述多个区域各自的光源发出的光的亮度设为用上述光源的最大亮度乘以上述增益的倒数得到的第一发光亮度,并将上述背光装置中的上述多个区域的光源为得到该第一发光亮度而应该分别单独发出的光的亮度设为第二发光亮度时,利用用上述第一发光亮度乘以第一系数的运算式,求得上述第二发光亮度,其中上述第一系数基于从上述多个区域各自的光源发出的光漏出到 Detecting a first maximum gradation, and is obtained by dividing a second maximum gradation by the first maximum gradation value corresponding to a value obtained, as a gain for each region of the video signal, wherein said second maximum gradation of the image signal is determined by the number of bits of the video signal acquired by multiplying the gain region of each of the video signal and supplied to the liquid crystal panel, the backlight device of the liquid crystal panel and the liquid crystal panel a plurality of divided regions corresponding to a plurality of areas, the brightness of the light from said plurality of regions in the backlight device of each of a first light emitted by multiplying the gain set by the reciprocal of the maximum luminance of the light source obtained when the luminance of the light emission luminance of the light source, and the plurality of regions of the backlight device to obtain the first emission luminance to be individually emitted from the second light emission luminance by multiplying the luminance of light emission by the first a coefficient arithmetic expression, the second emission luminance is obtained, wherein said first coefficient based on the leakage of light emitted from the light source of each of the plurality of regions 身区域以外的其他区域的光量,此时,在上述第二发光亮度在计算上为负值的情况下,以使上述第二发光亮度为0以上的值的方式对上述第一发光亮度进行校正后求得上述第二发光亮度,使上述背光装置中的上述多个区域各自的光源以上述第二发光亮度发光的同时,在上述液晶面板的多个区域上分别显示已乘以上述增益的每个上述区域的影像信号。 The amount of light in regions other than the region of the body, this time, in the case where the second emission luminance is calculated on the negative, so that the second emission luminance is a value of 0 or more ways of correcting the first emission luminance after the second emission luminance is obtained, so that the plurality of backlight device region of the respective light sources while the second light emission luminance of the display is respectively multiplied by the gain of each of the plurality of areas on the liquid crystal panel the video signal of the aforementioned areas.

在此,优选,根据已校正的上述第一发光亮度求得上述增益。 Here, it is preferable, according to the first emission luminance corrected to obtain the gain.

此外,优选,上述运算式是矩阵运算式。 Further, preferably, the calculation formula is a matrix equation.

在上述结构中,优选,上述液晶面板的多个区域是将上述液晶面板在垂直方向上一维划分的区域。 In the above configuration, preferably, the plurality of regions of the liquid crystal panel is the liquid crystal panel in the vertical direction one-dimensionally divided regions. 此时,优选,用上述背光装置的多个区域各自的上述第一发光亮度乘以第二系数,将上述第一发光亮度变得不均匀,以使从上述液晶面板中的位于一维排列的多个区域的垂直方向的中央部的区域开始到位于上下端部的区域为止,上述液晶面板上的亮度阶梯状地降低。 In this case, preferably, a plurality of regions of the backlight device of each of the first emission luminance by multiplying a second coefficient, the first emission luminance becomes non-uniform, so that from the liquid crystal panel positioned in the one-dimensional arrangement of region of the central portion in the vertical direction into a plurality of areas in the region of the start portion until the upper and lower ends, the luminance stepwise on the liquid crystal panel is reduced.

此外,在上述结构中,优选,上述液晶面板的多个区域是将上述液晶面板在水平方向及垂直方向双方上二维划分的区域。 Further, in the above structure, preferably, the plurality of regions of the liquid crystal panel is divided into two sides on the liquid crystal panel two-dimensionally in horizontal and vertical directions region.

此时,优选,用上述背光装置的多个区域各自的上述第一发光亮度乘以第二系数,将上述第一发光亮度变得不均匀,以使从上述液晶面板中的位于二维排列的多个区域的水平方向的中央部的区域开始到位于左右端部的区域为止,上述液晶面板上的亮度阶梯状地降低,并且从位于垂直方向的中央部的区域开始到位于上下端部的区域为止, 上述液晶面板上的亮度阶梯状地降低。 In this case, preferably, a plurality of regions of the backlight device of each of the first emission luminance by multiplying a second coefficient, the first emission luminance becomes non-uniform, so positioned from the two-dimensional array of the liquid crystal panel region of the central portion in the horizontal direction into a plurality of areas in the region of the start of the far left and right ends, the luminance stepwise on the liquid crystal panel is reduced, and starting from the region of the central portion is positioned in a vertical direction to the upper and lower ends of the region So far, the luminance stepwise on the liquid crystal panel is reduced.

优选,上述第二系数为0.8以上、lO以下的值。 Preferably, the second coefficient is 0.8 or more, less than lO value.

优选,上述背光装置的上述光源为发光二极管,并且通过根据上述第二发光亮度进行了脉冲宽度调制的驱动信号,对上述光源进行驱动。 Preferably the light source, the backlight device as a light emitting diode, and the light source is driven on the drive signal by performing pulse width modulation based on the second emission luminance.

根据本发明的液晶显示装置及用于该装置的影像显示方法,在将背光装置分割为多个区域,并根据影像信号的明亮度,按照每个区域分别控制背光的发光亮度的情况下,能够抑制每个区域各自的明亮度或色调的偏差,能够提高液晶面板上显示的影像的品质。 The liquid crystal display device of the present invention and a method for the image display apparatus, in the case where the backlight device is divided into a plurality of regions, and based on the brightness of the video signal, for each zone separately controlled backlight emission luminance can be suppress variation in brightness or hue of each of each region, can improve the image quality displayed on the liquid crystal panel. 此外,在使第一发光亮度不均匀的情况下,能够进一步削减背光装置的消耗电力。 Further, in the case where the first light emission luminance unevenness, it is possible to further reduce the power consumption of the backlight device.

附图说明 BRIEF DESCRIPTION

图1是表示本发明的第一实施方式涉及的液晶显示装置的整体结构的框图。 1 is a block diagram showing an overall configuration of a liquid crystal device of a first embodiment of the present invention relates to a display.

图2是概要表示液晶面板34的区域与背光装置35的区域的对应关系的透视图。 FIG 2 is a schematic perspective view showing a correspondence between a region of liquid crystal panel 34 and backlight device 35 is region.

图3是用于说明由影像增益运算部12求得的增益的运算过程的图。 FIG 3 is a diagram illustrating the operational procedure determined by the image gain calculator 12 for explaining gain.

图4是表示背光装置35的第一结构例的图。 FIG 4 is a diagram showing a first configuration example of backlight device 35.

图5是表示背光装置35的第二结构例的图。 FIG 5 is a diagram illustrating a second configuration example of backlight device 35.

图6是表示背光装置35的光源352的结构例的俯视图。 FIG 6 is a plan view showing a configuration example of light sources 352 of backlight device 35.

图7是表示背光装置35的二维的区域分割的例子的图。 7 is a two-dimensional region division of backlight device 35 of the example of FIG.

图8是用于说明图1的非均匀化处理部21中的非均匀化处理的图。 FIG 8 is a diagram for explaining non-uniformization processor 21 of non-uniform processing unit of FIG.

图9是用于说明背光装置35的区域中的漏光的图。 FIG 9 is a view of light leakage in the regions of backlight device 35 for FIG. 图10是表示背光装置35的各区域单独点亮时的各区域上的亮度的图。 FIG 10 is a view showing luminance in each region when each region of backlight device 35 individually lighting.

图11是表示将背光装置35 —维分割区域时第一〜第四实施方式中使用的矩阵运算式的图。 FIG 11 is a view showing backlight device 35 - FIG matrix equations in the first to fourth embodiments when the dimensions used in the divided regions.

图12是表示将背光装置35 —维分割区域时第一〜第四实施方式中使用的矩阵运算式的图。 FIG 12 is a view showing backlight device 35 - FIG matrix equations in the first to fourth embodiments when the dimensions used in the divided regions.

图13是表示将图11、图12的矩阵运算式一般化的矩阵运算式的图。 13 is a diagram showing FIG. 11, FIG matrix equations of the matrix equations 12 of FIG generalized.

图14是表示将背光装置35 二维分割区域时的漏光的图。 FIG 14 is a view showing a two-dimensional light leakage when the divided region 35 of the backlight device.

图15是表示将背光装置35 二维分割区域时第一〜第四实施方式中使用的矩阵运算式的图。 FIG 15 is a view of a first matrix equations used to fourth embodiments when the backlight divided regions 35 two-dimensional devices.

图16是表示将背光装置35 二维分割区域时第一〜第四实施方式中使用的矩阵运算式的图。 FIG 16 is a view of a first matrix equations used to fourth embodiments when the backlight divided regions 35 two-dimensional devices.

图17是表示将图15、图16的矩阵运算式一般化的矩阵运算式的图。 17 is a diagram showing FIG. 15, FIG. 16 matrix equations generalized matrix equations FIG.

图18是表示本发明的第一实施方式涉及的液晶显示装置的动作及影像显示方法的步骤的流程图。 FIG 18 is a flowchart showing the operation of the device and a liquid crystal display method of an image of a first embodiment of the present invention relate to a display.

图19是表示本发明的第一实施方式涉及的液晶显示装置的动作及影像显示方法的步骤的变形例的流程图。 FIG 19 is a flowchart showing a variation of the procedure and the operation of the apparatus a liquid crystal image display method of the first embodiment of the present invention relate to a display.

图20是表示本发明的第一实施方式涉及的液晶显示装置的动作及影像显示方法的步骤的其他变形例的流程图。 FIG 20 is a liquid crystal showing a first embodiment of the present invention is directed to a flowchart showing another modification example of the operation steps of the method and image display device.

图21是表示本发明的第二实施方式涉及的液晶显示装置的整体 FIG 21 is an overall liquid crystal device according to a second embodiment of the present invention relates to a display

结构的框图。 Block diagram.

图22是用于说明本发明的第二实施方式的图。 FIG 22 is a view of a second embodiment of the present invention. FIG. 图23是表示将光源的发光亮度转换为发光量的矩阵运算式的图。 FIG 23 shows a light source is converted into a luminance matrix equations FIG emission amount. 图24是表示用于说明图23的矩阵运算式的计算式的图。 FIG 24 is a matrix equation of the calculation formula of Fig. 23 for description. 图25是表示将光源的发光亮度转换为发光量的矩阵运算式的图。 FIG 25 shows a light source is converted into a luminance matrix equations FIG emission amount. 图26是表示本发明的第三实施方式涉及的液晶显示装置的整体结构的框图。 FIG 26 is a block diagram showing an overall configuration of a liquid crystal device of a third embodiment of the present invention relate to a display.

图27是用于说明本发明的第三实施方式的图。 FIG 27 is a view of a third embodiment of the present invention. FIG.

图28是用于说明本发明的第三实施方式中的发光亮度的校正的图。 FIG 28 is a light emission luminance correcting a third embodiment of the present invention. FIG.

图29是用于说明本发明的第三实施方式中的发光亮度的校正的图。 FIG 29 is a light emission luminance correcting a third embodiment of the present invention. FIG.

图30是用于说明本发明的第四实施方式涉及的液晶显示装置的特性图。 FIG 30 is a characteristic diagram for explaining a liquid crystal device according to a fourth embodiment of the present invention relates to a display.

图31是用于说明本发明的第四实施方式涉及的液晶显示装置的特性图。 FIG 31 is a view for explaining a fourth embodiment of the present invention is a liquid crystal according to a characteristic diagram of a display device.

图32是用于说明本发明的第四实施方式涉及的液晶显示装置的特性图。 FIG 32 is a characteristic diagram for explaining a liquid crystal device according to a fourth embodiment of the present invention relates to a display.

图33是表示本发明的第四实施方式涉及的液晶显示装置中的衰减系数k与消耗电力相对值的关系的特性图。 FIG 33 is a graph showing the relationship between the extinction coefficient k means the relative value of the power consumption of the liquid crystal of the fourth embodiment of the present invention is directed to a display.

具体实施方式 Detailed ways

第一实施方式 First Embodiment

以下,参照附图,对本发明的第一实施方式涉及的液晶显示装置及用于该装置的影像显示方法进行说明。 Referring to the drawings, an image display apparatus and method for the liquid crystal device according to a first embodiment of the present invention relates to a display will be described. 图1是表示本发明的第一实施方式涉及的液晶显示装置的整体结构的框图。 1 is a block diagram showing an overall configuration of a liquid crystal device of a first embodiment of the present invention relates to a display. 在图1中,在后述液晶模块部30内的液晶面板34上显示的影像信号被供给到影像信号处理部10内的最大灰度检测部11及帧存储器13。 In FIG 1, a video signal on the liquid crystal panel 34 in the liquid crystal module after said display portion 30 is supplied to a maximum gradation detector 10 in the video signal processing unit 11 and the frame memory 13. 如后文的说明,背光装置35被划分为多个区域,液晶面板34与背光装置35的各区域对应地被划分为多个区域,按照液晶面板34的每个区域,背光的明亮度(光量)分别受到控制。 As described later, the backlight device 35 is divided into a plurality of regions, each region corresponding to the liquid crystal panel 34 and backlight device 35 is divided into a plurality of regions, each region of the liquid crystal panel 34, the luminance of the backlight (amount of light ) were under control.

图2是液晶面板34和背光装置35上的区域分割的一例,是概要表示液晶面板34的区域与背光装置35的区域的对应关系的透视图。 FIG 2 is an example of area division on the liquid crystal panel 35 and backlight device 34 is a perspective view of a correspondence between a region and the region of backlight device 34 is a schematic showing the liquid crystal panel 35. 在此,为了容易理解,设置为使液晶面板34与背光装置35分离的状态。 Here, for easy understanding, arranged so that the liquid crystal panel 34 and backlight device 35 separated. 如图2所示,背光装置35被划分为区域35a〜35d,区域35a〜35d 分别具有背光。 , The backlight device 35 is divided into 2 35a~35d regions, each region having a backlight 35a~35d. 液晶面板34例如具有由水平方向1920像素、垂直方向1080像素构成的多个像素,该具有多个像素的液晶面板34与背光装置35的区域35a〜35d对应地被划分为区域34a〜34d。 The liquid crystal panel 34 having, for example, 1920 pixels in the horizontal direction, 1080 pixels in the vertical direction a plurality of pixels, the area having a plurality of pixels of the liquid crystal panel 34 and backlight device 35 35a~35d is divided into regions corresponding to 34a~34d. 在该例子中, 液晶面板34在垂直方向上被一维划分为四个区域34a〜34d,因此一个区域含有垂直方向270个像素。 In this example, the liquid crystal panel 34 in the vertical direction is one-dimensionally divided into four regions 34a~34d, and therefore a region containing 270 pixels in the vertical direction. 当然,四个区域34a〜34d中在垂直方向的像素数量上也可以多少存在偏差。 Of course, four regions may also be present 34a~34d many variations in the number of pixels in the vertical direction.

液晶面板34上的区域34a〜34d不是将各区域物理分离进行划分, 而是在液晶面板34上设定有多个区域(在此为区域34a〜34d)。 Region on the liquid crystal panel 34 34a~34d not be physically separated from each divided region, but the liquid crystal panel 34 is set in a plurality of regions (here, regions 34a~34d). 并且, 向液晶面板34供给的影像信号,与液晶面板34上设定的多个区域对应地,作为该多个区域各自显示的每个区域的影像信号被处理。 Then, a video signal is supplied to the liquid crystal panel 34 is set on the liquid crystal panel 34 corresponding to the plurality of regions, each region for each video signal is handled as the display of a plurality of regions. 在液晶面板34上设定的多个区域中,背光的明亮度分别被单独控制。 A plurality of regions set on liquid crystal panel 34, the luminance of the backlight are controlled individually.

在图2所示的例子中,将液晶面板34在垂直方向上划分为四个区域,与此对应地,将背光装置35在垂直方向上划分为四个区域,但是也可以划分(区分)为更多的区域。 In the example shown in FIG. 2, the liquid crystal panel 34 in the vertical direction is divided into four regions, corresponding thereto, the backlight device 35 is divided into four regions in the vertical direction, but may also be divided (division) is more areas. 此外,如后文所述,也可以将液晶面板34在垂直方向和水平方向双方上划分为多个区域,并与此对应地,将背光装置35在垂直方向和水平方向双方上区分为多个区域。 Further, as described later, may be a liquid crystal panel 34 in both the vertical and horizontal directions on a plurality of areas divided, and in correspondence to this, the backlight device 35 in both the vertical and horizontal directions into a plurality of regions region. 优选划分(区分)的区域数量多,与仅在垂直方向上划分(区分)相比, 优选在垂直方向和水平方向双方上划分(区分)。 Preferably the number of divided areas (case) is large, as compared with only division (division) in the vertical direction, preferably in both the vertical and horizontal directions on the division (division). 在此,为了将说明简化,以图2所示垂直方向的四分为例说明图l的动作。 Here, in order to simplify the explanation, a quarter of an example operation of FIG. L 2 vertical direction as shown in FIG.

返回图1,最大灰度检测部11,按照影像信号的每个帧分别对液 Returning to Figure 1, the maximum gradation detector 11, for each frame of video signal respectively liquid

晶面板34的各区域34a〜34d上显示的影像信号的最大灰度进行检测。 Maximum gradation of the video signal displayed on respective regions 34a~34d crystal panel 34 is detected. 优选按照影像信号的每一个帧检测最大灰度,但是也可以根据情况按照每两个帧分别进行检测,按照每个预定的单位时间分别检测出最大灰度即可。 Preferably each frame in accordance with the detection signal of the maximum gradation image, but may be carried out according to the situation at every two frames are detected, to detect the maximum gradation for each predetermined unit time. 由最大灰度检测部11检测的表示每个区域34a〜34d的最大灰度的数据供给到影像信号处理部10内的影像增益运算部12和背光亮度控制部20内的非均匀化处理部21。 Of the data supplied from maximum gradation detector 11 detects a maximum gradation of each region, said 34a~34d to non-uniformization processor 21 in the video signal processing unit 20 image gain calculator 10 is within backlight luminance control unit 12 and the . 影像增益运算部12如下所示计算与区域34a〜34d上显示的影像信号相乘的增益。 Gain multiplied video signal displayed on the computing region shown 34a~34d image gain calculator 12 as follows.

图3是用于说明由影像增益运算部12求得的增益的运算过程的图。 FIG 3 is a diagram illustrating the operational procedure determined by the image gain calculator 12 for explaining gain. 与影像信号相乘的增益按照向液晶面板34的各区域34a〜34d供给的每个影像信号分别求得。 Multiplied by the gain of the video signal for each video signal supplied to each liquid crystal panel region 34 are determined 34a~34d. 因此,以下说明的增益的运算,对向区域34a〜34d供给的各影像信号进行。 Thus, the gain calculation described below, a video signal supplied to each area to be 34a~34d. 另外,在图3中,横轴表示的输入信号(影像信号)为8位,表示输入信号取灰度0〜255的值的情况。 Further, in FIG. 3, an input signal (video signal) and the horizontal axis is represented by 8 bits, where the value of an input signal takes a gradation of 0~255. 此外,纵轴表示的液晶面板34的显示亮度(显示灰度)忽略液晶面板34的透过率,并为了方便取0〜255的值进行说明。 Further, the display luminance of the liquid crystal panel 34 is represented by the vertical axis (display gradation) ignores the transmittance of the liquid crystal panel 34, and for convenience will be described 0~255 value is taken. 影像信号的位数并不限定于8位,例如也可以是10位。 The number of bits of the video signal is not limited to 8 bits, for example, it may be 10 bits.

图3 (A)所示的曲线Cvl表示灰度为0〜255的输入信号以怎样的显示亮度显示在液晶面板34上。 Cvl curve shown in (A) of FIG. 3 shows the input signal 0~255 gradation displayed on the liquid crystal panel 34 to display how the brightness. 曲线Cvl是在横轴为x、纵轴为y 时,y由x的2.2次幂〜2.4次幂表示的曲线,是一般被称为伽马2.2〜 2.4的伽马曲线。 Cvl curve in the horizontal axis is x, and the vertical axis is y, y-th power of x from 2.2 ~2.4 times represented by a power curve is generally called a gamma 2.2~ 2.4 gamma curve. 根据液晶面板34的种类,存在图3 (A)的伽马曲线Cvl不同的情况。 Depending on the type of liquid crystal panel 34, there are different in FIG. 3 (A) where a gamma curve Cvl.

在此,作为一例,如图3 (B)所示,考虑输入信号的最大灰度为127,输入信号取灰度0〜127的值的情况。 Here, as an example, FIG. 3 (B), the input signal is considered the maximum gradation is 127, where the value of the input signal takes a gradation of 0~127. 此时的液晶面板34的显示亮度变成由曲线Cv2表示的曲线,显示亮度取0〜56的值。 At this time, the brightness of the liquid crystal display panel 34 becomes a curve represented by curve Cv2, display luminance takes a value of 0~56. 此时,认为背光以最大亮度的灰度255发光。 In this case, the maximum luminance gradation that the backlight 255 to emit light. 背光的最大亮度是指,在影像信号为最大灰度255 (即白色)时,背光应该发出的亮度。 Refers to the maximum brightness of the backlight, the video signal of the maximum gradation 255 (i.e., white), the luminance of the backlight to be emitted. 若图3 (B) 中用曲线Cv2表示的影像信号乘以约4.5的增益,则变成图3 (C)所示的曲线Cv3。 If the video signal of FIG. 3 (B) is represented by curve Cv2 by a gain of about 4.5, it becomes as shown in FIG. 3 (C) curve Cv3. 增益取约4.5是由255/56得到。 Gain is about 4.5 is obtained from 255/56. 在图3 (C)的状态下, 也认为背光以最大亮度发光。 In the state of FIG. 3 (C), but also that at the maximum backlight brightness.

在该状态下,具有由曲线Cv3表示的特性的影像信号不是具有图3 (B)中由曲线Cv2表示的特性的本来的影像信号,此外,背光无谓地消耗电力。 In this state, an image signal having characteristics indicated by curve Cv3 not the original video signal having a characteristic in FIG. 3 (B) is represented by curve Cv2, and furthermore, the backlight power consumption unnecessarily. 因此,若将背光的发光亮度设为最大亮度的约1/4.5倍, 则如图3 (D)所示,显示亮度0~255的曲线Cv3变成显示亮度0〜56 的曲线Cv4。 Accordingly, if the emission luminance of the backlight is set to about 1 / 4.5 times the maximum brightness, 3 (D) as shown in FIG, display luminance curve Cv3 0 ~ 255 becomes Cv4 graph of luminance 0~56. 由此,具有由曲线Cv4表示的特性的影像信号与具有由曲线Cv2表示的特性的本来的影像信号实质上等价,并且背光的消耗电力降低。 Thereby, the image signal having characteristics indicated by the curve Cv4 with the original image signal having characteristics indicated by curve Cv2 substantially equivalent, and the backlight power consumption is reduced.

艮P,若将区域34a〜34d上分别显示的影像信号的l帧期间内的最大灰度设为Gmaxl,将由影像信号的位数决定的影像信号所取得的最大灰度设为Gmax0,则影像增益运算部12将每个区域34a〜34d的GmaxO/Gmaxl作为与区域34a〜34d上显示的影像信号相乘的增益。 Gen P, if the maximum gradation in the l-frame period of the video signal displayed on each region to the maximum grayscale image signal 34a~34d Gmaxl, the number of bits determined by the video signal is set to the acquired Gmax0, then the image 12 the video signal displayed on each of regions 34a~34d GmaxO / Gmaxl region as a gain to be multiplied 34a~34d gain calculation unit. 作为增益GmaxO/Gmaxl的倒数的Gmaxl/GmaxO,在背光亮度控制部20 中,控制背光的亮度时使用。 , In the backlight luminance control unit 20, using the backlight brightness control as the reciprocal of the gain GmaxO / Gmaxl of Gmaxl / GmaxO. 若区域34a〜34d上显示的影像信号的图案不同,则区域34a〜34d各自的最大灰度Gmaxl当然不同,因此GmaxO/Gmaxl在区域34a〜34d上各不相同。 If the pattern of the video signal displayed on a different region 34a~34d, the area of ​​each of the maximum gradation Gmaxl 34a~34d of course, different, and therefore GmaxO / Gmaxl vary over the area 34a~34d. 在后文对背光亮度控制部20的结构及动作进行详细说明。 The structure and operation of backlight luminance controller 20 will be described in detail later.

在图1中,由影像增益运算部12得到的每个区域34a〜34d的增益被输入到乘法器14。 In Figure 1, each region by the gain obtained 34a~34d image gain calculator 12 is input to the multiplier 14. 乘法器14用从帧存储器13输出的区域34a〜 34d上显示的影像信号乘以各自的增益并输出。 The multiplier 14 from the video signal displayed on the output region of the frame memory 13 is multiplied by the respective gains 34a~ 34d and outputs.

从乘法器14输出的影像信号被供给到液晶模块部30的时序控制部31。 Is supplied to the multiplier 14 outputs the video signal to the liquid crystal module unit 30 from the timing control unit 31. 液晶面板34具有上述多个像素341,在像素341的数据信号线上连接有数据信号线驱动部32,在栅极信号线上连接有栅极信号线驱动部33。 The liquid crystal panel 34 having the plurality of pixels 341, the pixel data signal line 341 is connected to the data signal line drive unit 32 is connected to the gate signal line driving section 33 in the gate signal line. 被输入到时序控制部31的影像信号被供给到数据信号线驱动部32。 A video signal is input to the timing control unit 31 is supplied to the data signal line drive unit 32. 时序控制部31通过数据信号线驱动部32和栅极信号线驱动部33,控制将影像信号写入液晶面板34的时序。 The timing control unit 31 through the data signal line driver 32 and gate signal line driver section 33, the control timing of the video signal is written in the liquid crystal panel 34. 构成输入到数据信号线驱动部32中的影像信号的各行的像素数据通过栅极信号线驱动部33 对栅极信号线的驱动,逐行依次被写入到各行的像素。 Constituting the input pixel data of each line of video signal 32 in the data signal line drive unit is sequentially written to the pixels in each row through the gate signal line driver unit 33 drives the gate signal line, progressive. 由此,影像信号的各帧依次显示在液晶面板34上。 Thus, each frame of the video signal are sequentially displayed on the liquid crystal panel 34.

背光装置35被配置在液晶面板34的背面侧。 The backlight device 35 is disposed on the back side of the liquid crystal panel 34. 作为背光装置35, 有如下类型:配置在液晶面板34的正下方的直下型;和将从背光发出的光入射到导光板,从而向液晶面板34照射的导光板型,可以是其中任意类型。 As the backlight device 35, there are the following types: a direct-type liquid crystal panel disposed below the positive 34; a light emitted from the backlight and is incident on the light guide plate 34 so as to irradiate the light guide plate type liquid crystal panel, which may be of any type. 背光装置35通过背光驱动部36被驱动。 The backlight unit 3536 is driven by the backlight driving unit. 用于使背光发光的电力从电源部40被供给到背光驱动部36。 Power for the backlight 40 to emit light is supplied from the power supply section 36 to the backlight drive section. 另外,从电源部40向需要电力的电路的各部供给电力。 Further, 40 supplies power to each circuit requires power from a power supply unit. 液晶模块部30具有对背光装置35的温度进行检测的温度传感器、和对从背光装置35发出的光的色温进行检测的颜色传感器。 Liquid crystal module unit 30 has a temperature sensor the temperature of backlight device 35 detects, and for the color temperature of light emitted from backlight device 35 detects the color sensor.

在此,对背光装置35的具体结构例进行说明。 Here, a specific configuration example of backlight device 35 will be described. 图4与图2同样地, 表示将背光装置35在垂直方向上划分为四个区域的例子。 4 and FIG. 2 similarly shows an example of backlight device 35 is divided into four regions in the vertical direction. 将图4所示的背光装置35的第一结构例称为背光装置35A,将后述图5所示的背光装置35的第二结构例称为背光装置35B。 The backlight device shown in FIG. 35 is referred to as a first configuration example of backlight device 35A, backlight device after said 5 shown in FIG. 35 is referred to as a second configuration example of backlight device 35B. 此外,背光装置35是背光装置35A、 35B及其他结构例的统称。 Further, the backlight device 35 is collectively referred to as backlight device 35A, 35B and other configuration example. 图4 (A)是背光装置35A的俯视图,图4(B)是表示将背光装置35A在垂直方向上截断的状态的剖面图。 FIG. 4 (A) is a plan view of a backlight device 35A, and FIG. 4 (B) is a sectional view showing backlight device 35A is vertically cut state.

如图4 (A) 、 (B)所示,背光装置35A是在具有预定的深度的矩形框体351上使背光的光源352在水平方向排列而安装的结构。 FIG. 4 (A), (B), the backlight device 35A has a backlight in a predetermined depth of the rectangular frame 351 is mounted a light source 352 arranged in a horizontal direction of the structure. 光源352例如为LED。 The light source 352, for example, an LED. 区域35a〜35d,通过从框体351的底面以比光源352的最上表面(顶部)高的预定的高度突出的区分壁353被彼此划分。 Region 35a~35d, by the uppermost surface of the (top) from the frame body 351 than the light source 352 to the bottom surface of the predetermined projection height high partition walls 353 are divided from each other. 框体351的内侧及区分壁353的表面由反射片覆盖。 Partition walls 353 and the inner surface of the casing 351 is covered with a reflection sheet. 在框体351的上部安装有使光扩散的扩散板354,在扩散板354 上例如安装有三张光学片类355。 In the upper housing 351 is attached to the diffusion plate 354 diffusing light, for example, on the diffusion plate 354 mounted with three optical sheets 355. 光学片类355是将使光扩散的扩散片、 棱镜片(Prism Sheet)、及被称为DBEF (Dual Brightness Enhancement Film)的亮度上升薄膜等多个片组合的部件。 Optical sheets 355 will be a diffusion sheet diffusing light, a prism sheet (Prism Sheet), and is referred to as DBEF (Dual Brightness Enhancement Film) a plurality of sheets of brightness enhancement film and the like combined member. 由反射片构成的区分壁353的高度未到达至扩散板354,因此区域35a〜35d未完全分离,不是彼此完全独立的状态。 Height of partition walls 353 made of a reflective sheet does not reach the diffusion plate 354, so the region is not completely separated 35a~35d, they are not completely independent from each other state. 即,在背光装置35A中,其结构允许从区域35a〜35d各自的光源352发出的光漏出到其他区域。 That is, in the backlight device 35A, the structure allows light emitted from the respective light sources 352 35a~35d region to leak to other regions. 如后文详细说明所示,在第一实施方式中,考虑从各区域35a〜35d漏出到其他区域的光量,对从区域35a〜35d发出的光的亮度进行控制。 As explained later in detail, in the first embodiment, the leakage from the regions considered 35a~35d other regions to the light quantity, the brightness of light emitted from region 35a~35d control.

图5表示在将液晶面板34在垂直方向上划分为四个区域,进而在水平方向上划分为四个区域时,即在将液晶面板34 二维划分为16个区域时作为背光装置35的第二结构例的背光装置35B。 5 shows when the liquid crystal panel 34 in the vertical direction is divided into four regions, and further divided into four regions in the horizontal direction, i.e., as the backlight device 35 when the liquid crystal panel 34 is divided into 16 two-dimensional area the backlight device 35B an example of two structures. 图5 (A)是背光装置35B的俯视图,图5 (B)是表示将背光装置35B在垂直方向上截断的状态的剖面图,图5 (C)是表示将背光装置35B在水平方向上截断的状态的剖面图。 FIG 5 (A) is a plan view of a backlight device 35B, and FIG. 5 (B) shows a cross-sectional view of FIG. 35B in the vertical direction of the cut state of the backlight unit, FIG. 5 (C) is a view showing backlight device 35B cut in the horizontal direction sectional view of a state. 在此,图5 (B)表示将图5 (A)的左端部区域的列截断的状态,图5 (C)表示将图5 (A)的上端部区域的行截断的状态。 Here, FIG. 5 (B) shows a row of FIG. 5 (A) region of the left end portion of the truncated state, FIG. 5 (C) shows a row of FIG. 5 (A) of the upper end region of the truncated state. 另外,在图5中,与图4相同的部分标以同一标号,并适当省略其说明。 Further, in FIG. 5, the same parts as in FIG. 4 by the same reference numerals, and description thereof will be omitted appropriately.

框体351通过水平方向及垂直方向的区分壁353,被划分为区域35al〜35a4、 35bl〜35b4、 35cl〜35c4、 35dl〜35d4这16个区域。 Housing 351 by the horizontal and vertical directions of the partition walls 353, is divided into 35al~35a4, 35bl~35b4, 35cl~35c4, 35dl~35d4 sixteen regions, regions. 在背光装置35B上,也允许从区域35al〜35a4、 35bl〜35b4、 35cl〜 35c4、 35dl〜35d4各自的光源352发出的光漏出到其他区域。 In the backlight device 35B, also allows the region 35al~35a4, 35bl~35b4, 35cl~ 35c4, light leaks to other regions of the respective light sources 352 35dl~35d4 emitted. 在第一实施方式中,考虑从各区域35al〜35a4、 35bl〜35b4、 35cl〜35c4、 35dl〜35d4漏出到其他区域的光量,对从区域35al〜35a4、 35M〜 35b4、 35cl〜35c4、 35dl〜35d4发出的光的亮度进行控制。 In the first embodiment, from the viewpoint 35al~35a4, 35bl~35b4, 35cl~35c4, 35dl~35d4 quantity of light leaked to other regions of the regions, from the region of 35al~35a4, 35M~ 35b4, 35cl~35c4, 35dl~ 35d4 luminance of light emitted is controlled.

LED是指向性高的光源,因此在将LED用作光源352时,被反射片覆盖的区分壁353可以比图4、图5记载的状态低,根据情况也可以去除。 LED light source is a high directivity, and therefore when the LED is used as light source 352, a reflective sheet is covered by the partition walls 353 may be lower than the state of FIG 4 according to FIG. 5, the case may also be removed. 也可以通过由圆顶状的透镜覆盖光源352的元件,得到与设置区分壁353相同的效果。 By the light source elements 352 may be covered by a dome-shaped lens to give the same effect as the wall 353 provided distinguished. 作为背光的光源,也可以是LED以外的光源, 也可以使用CCFL或外部电极荧光灯(EEFL)等其他光源。 A backlight as a light source may be a light source other than the LED may be a CCFL or an external electrode fluorescent lamp (EEFL), and other sources. 但是,LED 容易控制发光亮度和发光面积,因此作为在第一实施方式中使用的光源352,优选LED。 However, LED is easy to control light emission luminance and the light emitting area, so as the light source 352 used in the first embodiment, it is preferred LED. 背光装置35的具体结构并不限定于图4或图5所示的结构。 Specific configuration of backlight device 35 is not limited to the configuration shown in FIG. 4 or FIG. 5.

图4、图5所示的光源352具体如下构成。 4, the light source 352 shown in FIG. 5 configured as follows. 图6(A)所示的光源352的第一结构例,在基板356上将G的LED 357G、 R的LED 357R、 B的LED 357B、 G的LED 357G以该顺序安装。 6 (A) a first configuration example of the light source shown in FIG. 352, 357B, G LED 357G is mounted in this order on the LED LED 357G 356 substrate G, R of the LED 357R, B's. 基板356例如为铝基板或玻璃环氧基板。 The substrate 356, for example, an aluminum substrate or a glass epoxy substrate. 图4、图5所示的光源352相当于使多个该图6(A) 的光源352排列为一列的光源。 4, the light source 352 shown in FIG. 5 corresponds to a plurality of FIG. 6 (A) as a light source of the light sources 352 are arranged in a row. 图6 (B)所示的光源352的第二结构例,在基板356上将R的LED 357R、 G的LED 357G、 B的LED 357B、 G的LED 357G安装为菱形。 FIG 6 (B) a second configuration example of light source 352 shown, the substrate 356 on the LED 357R of R, G of LED 357G, B of LED 357B, G mounted LED 357G of diamond. 图4、图5所示的光源352相当于使多个该图6 (B)的光源352排列为一列的光源。 Light sources 352, shown in FIG 54 corresponds to FIG plurality FIG. 6 (B) light source 352 are arranged in a row.

图6 (C)所示的光源352的第三结构例,在基板356上安装有12 个一体具有R的LED 357R、 G的LED 357G、 B的LED 357B的LED 芯片35S。 6 (C) a third configuration example of light source 352 shown in FIG, 356 are mounted on the substrate 12 integrally having the R LED 357R, G of LED 357G, LED chips of the LED 357B of 35S B. 图4、图5所示的光源352,相当于使多个该图6 (C)的光源352排列为一列的光源。 4, the light source 352 shown in FIG. 5, corresponding to the plurality of FIG. 6 (C) as a light source of the light sources 352 are arranged in a row. 图6 (D)所示的光源352的第四结构例, 在基板356上安装有两个白(W)的LED 357W。 FIG 6 (D) a fourth configuration example of light source 352 shown, the substrate 356 is mounted on two white (W) of the LED 357W. 图4、图5所示的光源352,相当于使多个该图6(D)的光源352排列为一列的光源。 4, the light source 352 shown in FIG. 5, corresponding to the plurality of FIG. 6 (D) as a light source of the light sources 352 are arranged in a row. 另外,作为LED 357W,有如下类型:用从B的LED放射的光激发黄色的荧光体得到白色的光;和用从LED放射的紫外线激发R、 G、 B的荧光体得到白色的光,可以是其中任意类型。 Further, the LED 357W, the following type: with radiation from LED B light excited the yellow phosphor obtained white light; and excite the R from the LED emitted ultraviolet light, G, phosphor B obtained white light, can be It is one of any type.

接下来,返回图1,对背光亮度控制部20的结构及动作进行说明。 Next, returning to FIG 1, the configuration and operation of backlight luminance controller 20 will be described. 背光亮度控制部20除了非均匀化处理部21以外,还具有发光亮度运算部22、白平衡调整部23、及PWM时序产生部24。 The backlight luminance control unit 20 in addition to the non-uniformization processor 21, 22 further includes a white balance adjustment section 23, and the light emission luminance calculator PWM timing generator 24. 在此也为了简化, 以图4所示的背光装置35A作为背光装置35进行说明。 In order to simplify this also to a backlight device 35A shown in FIG. 35 will be described as backlight device. 若将背光的最大亮度设为Bmax,则背光装置35的区域35a〜35d各自的背光应该发出的亮度为用最大亮度Bmax乘以按照每个区域34a〜34d分别求得的Gmaxl/GmaxO即可。 If the backlight is set to maximum brightness Bmax, the backlight luminance region 35a~35d 35 of each of the backlight to be emitted by multiplying the maximum luminance Bmax Gmaxl / GmaxO 34a~34d separately for each area can be determined. 这样,非均匀化处理部21求得区域35a〜35d的背光应该发出的亮度B,〜B4。 Thus, non-uniform luminance processing unit 21 determines a region B should send the backlight 35a~35d, ~B4.

该计算上的发光亮度Bi〜B4,不是作为背光的光源352发光时光源352正上方的亮度,而是从背光装置35发出的光的亮度。 Bi~B4 emission luminance on this calculation, 352 is not directly above the light source luminance of a backlight light source 352 emits light, but the luminance of light emitted from backlight device 35. g卩,在图4、图5的结构例中,发光亮度Bi〜B4为光学片类355上方的亮度。 g Jie, in the configuration of FIG 4, FIG 5, the emission luminance Bi~B4 luminance of the optical sheets 355 upward. 另外,将从背光装置35的一个区域应该发出的计算上的发光亮度统称为B。 Further, the calculated light emission from a region of backlight device 35 to be referred to as luminance emitted B. 在以下说明中,设从背光装置的区域35a〜35d发出的光的亮度分布在各区域内大致相同而进行说明,但是也有在一个区域内亮度分布不同的情况。 In the following description, the light emitted from the backlight device regions 35a~35d luminance distribution in each region is substantially the same and will be described, but also in an area different from the luminance distribution. 此时, 一个区域内的任意点上的明亮度为发光亮度Bi〜 B4即可。 At this time, the brightness at any point within the area of ​​a light emission luminance can Bi~ B4.

以往,若区域34a〜34d所有的影像信号的灰度相同,则区域35a〜 35d的发光亮度Bi〜B4均相同。 Conventionally, if all of the same area gradation video signal 34a~34d, the emission luminance region Bi~B4 35a~ 35d are the same. 即,此时将计算上的发光亮度B!〜B4 直接用作实际的发光亮度。 That is, when the calculated light emission luminance B! ~B4 directly used as the actual emission luminance. 与此相对,在第一实施方式中,非均匀化处理部21将计算上的发光亮度B!〜B4乘以非均匀化系数Pl〜p4,将从区域35a〜35d实际发出的光的亮度变为PlB!、 p2B2、 p3B3、 p4B4。 On the other hand, in the first embodiment, the non-uniformization processor 21 in calculating the light emission brightness B! ~B4 non-uniformity coefficient multiplying Pl~p4, the light emitted from the region 35a~35d actual luminance variation as plB !, p2B2, p3B3, p4B4. 系数Pi〜P4为大于0、 1以下的值。 Pi~P4 coefficient greater than 0, the value of 1 or less. 本发明人发现,与在液晶面板34的整个画面上使背光直接发出计算上的发光亮度相比,在画面周边部使背光以比计算上的发光亮度降低一些的发光亮度发光时,液晶面板34 上显示的影像的品质提高。 The present inventors have found that, as compared with the backlight on the entire screen 34 of the liquid crystal panel directly emits light emission luminance calculation portion in the periphery of the screen luminance of the backlight emission luminance is lowered some emission, the liquid crystal panel 34 to the calculated light emission improve the quality of the image on the display.

因此,在将背光装置35的区域一维分割为四份的图4的例子中, 优选使来自区域35a〜35d内与画面的上下端部对应的区域35a、 35d 的发光亮度B^ B4比来自区域35b、 35c的发光亮度B2、 83低。 Thus, in the example of the regions of backlight device 35 is divided into four one-dimensional parts of FIG. 4, it is preferable that the light emission 35a, 35d luminance region B from the region of the upper and lower end portions 35a~35d of the screen than from the corresponding ^ B4 regions 35b, 35c of the emission luminance B2, 83 is low. 具体而言,作为一例,将p!设为0.8,将p2、 P3设为l,将P4设为0.8。 Specifically, as an example, P! Set to 0.8, the p2, P3 is set to L, the P4 to 0.8.

在整个液晶面板34上显示白色的全白状态下,若液晶面板34的区域34b、34c的亮度为500[cd/m2],则在区域34a、34d上为400[cd/m2]。 Displayed on the entire liquid crystal panel 34 white all white state, when the region 34 of the liquid crystal panel 34b, 34c of the luminance of 500 [cd / m2], is the area 34a, 34d of the 400 [cd / m2]. 因此,背光装置35的区域35a、 35d上的消耗电力可以削减20。 Therefore, the region of backlight device 35 35a, 35d on the power consumption can be reduced 20. /。 /. . 这样,在第一实施方式中,通过设置非均匀化处理部21,不会降低液晶面板34上显示的影像的品质,反而使品质提高,并且可以削减背光装置35的消耗电力。 Thus, in the first embodiment, by providing the non-uniformization processor 21, without reducing the quality of the image displayed on the liquid crystal panel 34, but to make improved quality, and can reduce power consumption of backlight device 35. 考虑到影像的品质和消耗电力的削减这两方面,系数Pi〜P4优选在0.8以上、1.0以下。 Considering the image quality and the reduction of both power consumption, the coefficient Pi~P4 preferably 0.8 or more and 1.0 or less. 即,在画面中心部将与背光的发光亮度相乘的系数p设为1,在画面周边部将与发光亮度相乘的系数p 设定在下限值为0.8为止的范围内。 That is, the center portion of the screen multiplied by the emission luminance of the backlight of the coefficient p is set to 1, the peripheral portion of the screen multiplied by the emission luminance coefficient p is set within a range of 0.8 up to lower limit value.

进而,对将液晶面板34及背光装置35 二维分割区域时的非均匀化系数p进行说明。 Further, non-uniformization coefficient p of the liquid crystal panel when the backlight device 34 and region 35 divided in two dimensions will be described. 在此,以在水平方向及垂直方向双方上分割为八个区域的情况为例,即以二维分割为64个区域的情况为例。 Here, in the case of both the horizontal and vertical directions is divided into eight regions in the example, that a two-dimensional case is divided into 64 regions as an example. 如图7所示,此时的背光装置35的区域为35al〜35a8、35bl〜35b8、35cl〜35c8、 35dl〜35d8、 35el〜35e8、 35fl〜35f8、 35gl〜35g8、 35hl〜35h8。 7, the region of backlight device 35 at this time is 35al~35a8,35bl~35b8,35cl~35c8, 35dl~35d8, 35el~35e8, 35fl~35f8, 35gl~35g8, 35hl~35h8. 虽然未进行特别图示,但是液晶面板34与背光装置35的64个区域对应地被划分为64个区域。 Although not specifically illustrated, but the region 64 and the liquid crystal panel 34 corresponding to the backlight device 35 is divided into 64 regions.

图8(A)是与背光装置35的垂直方向的中央部的4行区域35cl〜 35c8、 35dl〜35d8、 35el〜35e8、 35fl〜35f8上的水平方向的8个区域各自的计算上的发光亮度相乘的系数p的一例。 FIG 8 (A) is the light emission luminance in the respective calculation 35cl~ 35c8, 35dl~35d8, 35el~35e8, 8 areas of 4 row area of ​​the central portion of the backlight device 35 in the vertical direction in the horizontal direction on the 35fl~35f8 the coefficient p is multiplied by one case. 图8 (A)的左右方向为水平方向的位置,左侧为画面左端部,右侧为画面右端部。 FIG 8 (A) in the left-right direction position of the horizontal direction, a left end portion of the left side of the picture, the right side of a right end portion of the screen. 在该例子中,对于作为水平方向的中央部的4个区域将系数p设为1,对于位于其左右的区域将系数p设为0.9,对于左右端部的区域将系数p设为0.8。 In this example, for four regions of the central portion of the horizontal direction of the coefficient p is set to 1, for the area located around the coefficient p is set to 0.9, for the area of ​​the right and left ends of the coefficient p is set to 0.8.

优选系数p随着从系数p为1的中央部接近画面的左右端部,依次阶梯状地减小。 Preferably coefficient p with the central portion from the coefficient p is 1 near left and right ends of the screen are sequentially reduced stepwise. 此时,优选系数p左右对称。 In this case, the coefficient p is preferably symmetrical. 在此,虽然将中央部的四个区域上的系数p设为1,但是也可以将中央部的两个区域上的系数p设为1,并从位于两个区域的左右的区域开始到左右端部的区域为止,使系数p在从小于l的值到0.8为止的范围内依次减小。 Here, coefficient p has four regions on the central portion is set to 1, but may also be on both the coefficient p is set to a region of the central portion, and starting from the left and right areas of the two regions to the left and right until the end portion of the region, so that the coefficient p in the range of 0.8 up successively reduced values ​​of from less than l. 此外,在分割数为奇数时,系数p为1的水平方向的区域也可以仅有一个。 Further, when the division number is odd, the coefficient p in the horizontal direction of the region 1 may be only one. 系数p的水平方向的特性可以适当设定为使得在实际的画面上产生最理想的影像品质。 Characteristics of the coefficient p in the horizontal direction may be suitably set such that the best image quality on a real screen.

图8(B)是与背光装置35的水平方向的中央部的4列区域35a3〜 35h3、 35a4〜35h4、 35a5〜35h5、 35a6〜35h6上的垂直方向的8个区域各自的计算上的发光亮度相乘的系数p的一例。 FIG. 8 (B) is 35a3~ 35h3, 35a4~35h4, 35a5~35h5, 8 four regions of backlight device region of the central portion 35 of the horizontal direction in the vertical direction on the emission luminance 35a6~35h6 respective calculation the coefficient p is multiplied by one case. 图8 (B)的左右方向为垂直方向的位置,左侧为画面上端部,右侧为画面下端部。 FIG. 8 (B) is a left-right direction position of the vertical direction, an upper left portion of the screen to the right lower portion of the screen. 在该例子中,对于作为垂直方向的中央部的四个区域将系数p设为1,对于位于其上下的区域将系数p设为0.9,对于上下端部的区域将系数p设为0.8。 In this example, for four regions in the vertical direction as the central portion of the coefficient p is set to 1, for the area located above and below the coefficient p is set to 0.9, for the area of ​​the upper and lower ends of the coefficient p is set to 0.8.

在垂直方向上,也优选系数p随着从系数p为1的中央部接近画面的上下端部,依次阶梯状地减小。 In the vertical direction, preferably also the coefficient p with the central portion from the coefficient p is 1 near the upper and lower end portions of the screen are sequentially reduced stepwise. 此时,优选系数p上下对称。 In this case, the coefficient p is preferably vertically symmetric. 在此,虽然将中央部的四个区域上的系数p设为1,但是也可以将中央部的两个区域上的系数p设为1,并从位于两个区域的上下的区域开始到上下端部的区域为止,使系数p在从小于1的值到0.8为止的范围内依次减小。 Here, coefficient p has four regions on the central portion is set to 1, but may also be on both the coefficient p is set to a region of the central portion, and is located starting from the upper and lower regions of the upper and lower regions until the end portion of the region, so that the coefficient p 1 from a value in the range of up to 0.8 gradually decreases. 此外,在分割数为奇数时,系数p为1的垂直方向的区域也可以仅有一个。 Further, when the division number is odd, the coefficient p in the vertical direction of the region 1 may be only one. 系数p的垂直方向的特性可以适当设定为使得在实际的画面上产生最理想的影像品质。 Characteristics of the coefficient p in the vertical direction may be appropriately set such that the best image quality on a real screen. 另外,也可以使系数p的水平方向的特性与垂直方向的特性不同。 Further, it is also possible characteristic coefficient p in the horizontal direction and the vertical direction different characteristics.

这样,从图1的非均匀化处理部21,得到表示从背光装置35的各区域实际上应该发出的光的发光亮度的数据。 Thus, the non-uniformization processor unit 21 of FIG. 1, to give light emission brightness data to be actually emitted from the respective regions of backlight device 35 of FIG. 从控制部50供给非均匀化处理部21中使用的系数p。 The coefficient p is supplied non-uniformization processor 21 from the control unit 50 used. 控制部50可以由微型计算机构成,系数p可以任意改变。 The control unit 50 may be constituted by a microcomputer, the coefficient p can be arbitrarily changed. 表示该发光亮度的数据被输入到发光亮度运算部22,如下运算各光源352应该发出的光的亮度。 Emission luminance data representing the luminance is input into the light 22, light emission luminance calculator operation follows each light source 352 to be emitted. 首先,对背光装置35 为具有区域35a〜35d的背光装置35A,并且从区域35a〜35d实际上应该发出的光的发光亮度为PiBp p2B2、 p3B3、 p4B4时的光源352应该发出的光的亮度的运算方法进行说明。 First, the backlight device 35 is backlight device 35A having regions 35a~35d, the emission luminance and the light emitted from the region should actually 35a~35d is PiBp p2B2, p3B3, brightness when light source 352 p4B4 be emitted computing method will be described. 图9 (A)是将图4 (B)的剖面图横转的状态,在此省略了光学片类355。 FIG. 9 (A) is a cross-sectional view of FIG. 4 (B) is a cross-state switch, this optical sheets 355 are omitted. 来自区域35a〜35d的光的发光亮度为piBppzB^pgB^paB^ 并且设p!Bi二B!'、 p2B2 = B2'、 p3B3 = B3'、 p4B4 = B4'。 Emission luminance of light from the area of ​​35a~35d piBppzB ^ pgB ^ paB ^ and let p! Bi two B! ', P2B2 = B2', p3B3 = B3 ', p4B4 = B4'. 标上"'"的发光亮度B'是指由非均匀化处理部21实施了非均匀化处理的发光亮度,未标上"'"的发光亮度B是指未实施非均匀化处理的发光亮度。 Superscript " '" light emission luminances B' refers to a non-uniformization processor 21 implemented emission luminance non-uniform treatment is not marked '' 'of the light emission luminances B means that no embodiment emission luminance non-uniform treatment . 将区域35a〜35d各自的光源352单独发光时的光源352正上方的发光亮度设为Bo。 The emission luminance of the light sources 352 when respective light sources 352 emitting 35a~35d separate area immediately above the set Bo. Bo2、 Bo3、 Bo4。 Bo2, Bo3, Bo4. 如上所述,允许从区域35a〜35d各自的光源352发出的光漏出到其他区域,因此B?、 B2'、 B3'、 B4'并不与发光亮度B0l、 Bo2、 Bo3、 Bo4相同。 As described above, the light leaks to other regions allow emitted from light sources 352 of respective regions 35a~35d, so B ?, B2 ', B3', B4 'and the light emission luminance is not B0l, Bo2, Bo3, same Bo4. 另外,扩散板354或光学片类355引起的光的衰减很弱,并不对其进行考虑。 Further, the diffusion plate 354, or very weak light attenuation optical sheets 355 caused not be considered. 另外,将背光装置35的一个区域的光源352单独发光时的光源352正上方的发光亮度统称为Bo。 Further, the light source 352 when the light source 352 of backlight device 35 a region directly above the light emission luminance individually referred to as Bo.

如图9 (A)所示,在区域35a〜35d所有的光源352发光时,从各光源352发出的光成为发光亮度Bop Bo2、 Bo3、 Bo4的k倍的漏光Li漏出到相邻的区域。 FIG. 9 (A), in the region 35a~35d when all light sources 352 emit light, light emitted from the light sources 352 light emission luminance Bop Bo2, Bo3, k times Bo4 Li leakage light leaks to the adjacent region. k为光漏出时的衰减系数,是大于0、小于l的值。 k is the attenuation coefficient when light leaks, is greater than 0, less than the value of l. 对向发光区域以外的其他区域的漏光进一步进行分析。 Further analysis of the leakage light to other regions other than the light emitting region. 图9 (B) 表示仅有区域35a的光源352发光时向区域35b〜35d漏光的状态。 FIG. 9 (B) represent the only source region 35a to the leakage light 352 emitting region 35b~35d state. 从区域35a的光源352以发光亮度B0l发出的光,成为亮度kB(^的漏光Li,漏出到区域35b。亮度kBcn的漏光Li进一步成为k倍的漏光,因此成为l^BOi的漏光L2,漏出到区域35c。亮度k2 Bc^的漏光L2进一步成为k倍的漏光,因此成为l^Bc^的漏光L3,漏出到区域35d。 From the light-receiving region 35a of the light source 352 to the light emission luminance B0l emitted becomes luminance kB (^ leakage of light Li, leaking light leakage Li area 35b. Luminance kBcn further be k times the light leakage become l ^ BOi leakage light L2, leakage to the area 35c. luminance k2 Bc ^ becomes leakage light L2 is k times the light leakage further, become l ^ Bc ^ L3 light leakage, leaks to region 35d.

在该图9(B)的情况下,从区域35a大致发出发光亮度Bo^勺光。 In the case of FIG. 9 (B) from the region 35a emits substantially light emission luminance Bo ^ spoon. 从区域35b通过亮度k B0l的漏光M发光,从区域35c通过亮度k2 B0l 的漏光L2发光,从区域35d通过亮度k3 B0l的漏光L3发光。 Leakage of light from the region 35b by M k B0l emission luminance, the luminance of light leakage from the area 35c emitting k2 B0l L2 from the L3 region 35d leakage light emission luminance of k3 B0l.

将区域35a〜35d的光源352分别单独点亮时从区域35a〜35d发出的光的亮度如图10所示。 The brightness of the light source region 352 35a~35d individually emitted from the lighting region 10 shown in FIG 35a~35d. 将区域35a〜35d所有的光源352点亮时从各区域35a〜35d发出的光的亮度为将图10的表所示的亮度在纵方向上全部相加的总计的亮度。 The brightness of the light source region 352 35a~35d all lighting emitted from each region is 35a~35d total luminance brightness table shown in FIG. 10 in the longitudinal direction of the entire additive. 即,从区域35a发出的光的亮度为Bo什k Bo2+k2 Bo3+k3 Bo4,从区域35b发出的光的亮度为k B0l+Bo2+k Bo3+k2 Bo4。 That is, the luminance of light emitted from region 35a is Bo even k Bo2 + k2 Bo3 + k3 Bo4, luminance of light emitted from region 35b is k B0l + Bo2 + k Bo3 + k2 Bo4. 从区域35c发出的光的亮度为k2 B0l+k Bo2+Bo3+k Bo4,从区域35d发出的光的亮度为k3 B0l+k2 Bo2+k Bo3+Bo4。 Luminance of light emitted from region 35c is k2 B0l + k Bo2 + Bo3 + k Bo4, luminance of light emitted from region 35d is k3 B0l + k2 Bo2 + k Bo3 + Bo4. 从区域35a〜35d应该发出的光的发光亮度为Bi'〜BV,因此可知可以在区域35a中将Bo一k Bo2+k2 Bo3+k3 Bo4设为B。 Emission luminance of light from the region is expected to emit 35a~35d Bi'~BV, and therefore can be seen that a k Bo2 + k2 Bo3 + k3 Bo4 is set in the region 35a in the Bo B. 在区域35b中将k Boi+Bo2+k Bo3+k2 Bo4设为B2',在区域35c中将k2Bo】+kBo2+Bo3+kBo4设为B3',在区域35d中将k3 Boi+k2 Bo2+k Bo3+Bo4设为B4'。 In the region 35b k Boi will + Bo2 + k Bo3 + k2 Bo4 set B2 ', will be in the region 35c k2Bo] + kBo2 + Bo3 + kBo4 to B3', in the region in k3 Boi 35d + k2 Bo2 + k Bo3 + Bo4 to B4 '.

图11 (A)所示的公式(1)将用于从由光源352发出的光的发光亮度Bo!、 Bo2、 Bo3、 B04得到发光亮度B?、 B2'、 B3'、 B^的转换式用矩阵运算式来表现。 FIG 11 (A) represented by the formula (1) for emission luminance Bo !, Bo2 from the light emitted by the light source 352, Bo3, B04 obtain emission luminance B ?, B2 ', B3', B ^ conversion formula It is expressed by a matrix equation. 图11 (B)所示的公式(2),将用于从发光亮度B。 FIG. 11 (B) Formula (2), the emission luminance for the B. B2'、 B3'、 B4'得到发光亮度B0l、 Bo2、 Bo3、 Bo4的转换式用矩阵运算式来表现。 B2 ', B3', B4 'emission luminance obtained B0l, Bo2, Bo3, Bo4 the conversion equation is expressed by a matrix equation. 图11 (C)所示的公式(3),为了在发光亮度运算部22中的电路上容易计算,对公式(2)进行了整理。 FIG. 11 (C) Equation (3) shown on the circuit for light emission luminance calculator 22 is easily calculated, equation (2) were consolidated. 图11 (D)所示的公式(4)表示公式(3)的常数a、 b、 c。 FIG. 11 (D) Equation (4) represents Equation (3) constants a, b, c. 从图11 (C)的公式(3) 可知,发光亮度Bo。 From FIG. 11 (C) of formula (3), the light emission luminance Bo. Bo2、 Bo3、 Bo4,可以通过基于从区域35a〜35d 的光源352发出的光漏出到自身区域以外的其他区域的光量的系数(变换系数)乘以发光亮度B^、 B2'、 B3'、 B4'来求得。 Bo2, Bo3, Bo4, light emission may be multiplied by the amount of light leaks to other regions other than the local area coefficients (transform coefficients) based on light emitted from the light source 352 of regions 35a~35d luminance B ^, B2 ', B3', B4 'to obtain.

由于可以测量出从背光装置35中的一个区域向相邻的区域的漏光",因此在图9、图10中说明的衰减系数k的值可以预先求得。因此,可以根据图11 (C)的公式(3)及图11 (D)的公式(4),正确地计算出区域35a〜35d各自的光源352应该发出的光的发光亮度B0l、 Bo2、 Bo3、 Bo4。 Since an area adjacent to the measured light leakage "from one region of backlight device 35, so in FIG. 9, the value of the attenuation coefficient k described in FIG 10 may be obtained in advance. Therefore, according to FIG. 11 (C) formula formula (3) and FIG. 11 (D) (4), correctly calculated the light source region 352 should 35a~35d respective emission luminance emitted B0l, Bo2, Bo3, Bo4.

另外,在向相邻的区域的漏光的衰减系数k小时,k的2次幂以上的项减小到可以忽略的程度。 Further, the attenuation coefficient k of leakage light into adjacent regions of the hour, or more secondary power term k is reduced to a negligible extent. 此时,也可以假设从一个区域发出的光仅漏出到相邻的区域,进行近似计算。 In this case, it can be assumed that light emitted from one region leaks to adjacent regions only, approximate calculation. 即,也可以将k的2次幂以上的项设为0进行计算。 I.e., it may be two or more items to the power k 0 is calculated. 此外,根据背光装置35的结构,也存在从一个区域发出的光以与k"咅、…、kM咅(在此11=3)不同的衰减方式漏出的情况,但是向各区域的漏光可以预先测量,因此在这种情况下, Further, according to the structure of backlight device 35, there is also light and k "sent from a region of Pou, ..., where different attenuation and leakage kM Pou (here 11 = 3), but each leakage light region may be previously measured, so in this case,

也可以正确地计算出光源352应该发出的光的发光亮度B0l、Bo2、Bo3、 Bo4。 It can be accurately calculated light emission source 352 is expected to emit luminance B0l, Bo2, Bo3, Bo4. 这一点在区域分割的方法不同的图5或图7的情况下也相同。 5 or FIG. 7 the case is also the same as this in a different area division method in FIG.

另外,在将背光装置35在垂直方向上分为8个区域时,若从8个区域应该发出的光的发光亮度为B,'〜Bs',将8个区域上的光源352单独发光时的光源352正上方的发光亮度设为B0l〜Bo8,则发光亮度Bc^〜B08可以根据图12所示的公式(5)进行计算。 When Further, when backlight device 35 is divided into eight regions in the vertical direction, when the light emission luminance of light to be emitted from the eight regions as B, '~Bs', the light source 8 emitting region 352 alone emission luminance directly above light sources 352 is set B0l~Bo8, the emission luminance may Bc ^ ~B08 (5) is calculated according to the formula shown in FIG. 12. 进而,若一般化为在垂直方向上分割为n个区域(n为2以上的整数),则发光亮度B^〜Bn'用图13 (A)所示的公式(6)得到,发光亮度B0l〜Bon,可以根据图13 (B)所示的公式(7)进行计算。 Furthermore, if divided into generally vertical direction into n areas (n is an integer of 2 or greater), light emission luminances B ^ ~Bn 'obtained by the FIG. 13 (A) shown in Equation (6), emission luminance B0l ~Bon, can be calculated according to the formula shown in FIG. 13 (B) (7).

接下来,对背光装置35为图5所示的背光装置35B时光源352 应该发出的光的亮度的计算方法进行说明。 The method of calculating the luminance of the light source 352 to be emitted Next, when the backlight 35 backlight device 35B shown in FIG. 5 apparatus will be described. 如图14所示,设从背光装置35B的区域35al〜35a4、 35bl〜35b4、 35cl〜35c4、 35dl〜35d4的光源352漏出到水平方向上相邻的区域的漏光是从光源352发出的光的m倍。 14, the region is provided from the backlight device 35B 35al~35a4, 35bl~35b4, 35cl~35c4, 35dl~35d4 leaking light source 352 to light leakage region is adjacent to the horizontal direction from the light source 352 m times. 水平方向的衰减系数m为大于O、小于1的值。 The attenuation coefficient m in the horizontal direction is greater than O, the value of less than 1. 漏出到垂直方向上相邻的区域的漏光,与背光装置35A的情况同样地,是从光源352发出的光的k倍。 Leakage light leaking to the area adjacent to the vertical direction, k times the light in the same manner, and the backlight is emitted from the light source device 35A of 352. 将从背光装置35B的区域35al〜35a4、 35bl〜 35b4、 35cl〜35c4、 35dl〜35d4实际上应该发出的光的发光亮度设为Bn'〜BM'、B2/〜B24'、B^〜B34'、B"'〜B44'。为了得到该发光亮度Bn'〜 B14'、 B21'〜B24'、 B31'〜B34'、 B41'〜B44',将各区域的光源352应该发出的光的发光亮度设为Bou〜Bo14、 Bo21〜Bo24、 Bo31〜Bo34、 Bo41〜Bo44。 A region from the backlight device 35B 35al~35a4, 35bl~ 35b4, 35cl~35c4, light emission luminance of light emitted 35dl~35d4 should actually set Bn'~BM ', B2 / ~B24', B ^ ~B34 ' , B " '~B44'. in order to obtain, B31'~B34 ', B41'~B44', the light emission luminance of each light source 352 to be emitted to the region of the emission luminance Bn'~ B14 ', B21'~B24' set Bou~Bo14, Bo21~Bo24, Bo31~Bo34, Bo41~Bo44.

若将在图9、图10中说明的考虑了漏光的发光亮度的计算方法也适用于水平方向,则矩阵运算式如图15所示。 If in FIG. 9, FIG. 10 is a consideration of the specification leakage light emission luminance calculation method is also applicable to the horizontal direction, a matrix equation shown in Figure 15. 图15 (A)所示的公式(8)是用于从由光源352发出的光的发光亮度Bou〜Bo44得到发光亮度Bu'〜B44'的矩阵运算式的转换式。 FIG 15 (A) Equation (8) is shown for the luminance of the light emitted from the light emitting from the light source 352 Bou~Bo44 emission luminance obtained Bu'~B44 'matrix equations of the conversion equation. 图15 (B)所示的公式(9)是用于从发光亮度Bu'〜BV得到发光亮度B0ll〜Bo44的矩阵运算式的转换式。 FIG. 15 (B) Equation (9) is shown for obtaining the emission luminance B0ll~Bo44 matrix equations emission luminance conversion equation from Bu'~BV. 若对公式(9)进行整理,则变成图15 (C)所示的公式(10)。 If equation (9) finishing, it becomes 15 (C) shown in FIG equation (10). 图15 (D)所示的公式(11)表示公式(10)的常数a、 b、 c、 d、 e、 f。 FIG. 15 (D) Equation (11) represents the equation (10) constants a, b, c, d, e, f. 在图14的情况下,衰减系数k、 m的值也可以预先求得,因此可以根据图15 (C)的公式(10)及图15 (D)的公式(11),正确地计算出区域35al〜35d4各自的光源352应该发出的光的发光亮度Bo„〜 Bo44。 In the case of FIG. 14, the attenuation coefficient k, the value of m may be obtained in advance, it is possible according to equation (10) and FIG. 15 (D) of equation (11) in FIG. 15 (C) is correctly calculated area 35al~35d4 light emission luminances Bo of respective light sources 352 are expected to emit "~ Bo44.

在将背光装置35在水平方向及垂直方向双方上分割为8个区域时,若从64个区域应该发出的光的发光亮度为BU'~B88',将64个区域上的光源352单独发光时的光源352正上方的发光亮度设为Bou〜 Bo88,则发光亮度Bu'〜Bss'用图16 (A)所示的公式(12)得到,发光亮度Bou〜Boss可以根据图16 (B)所示的公式(13)进行计算。 When when the backlight device 35 both on divided into eight regions in the horizontal and vertical directions, the light emission luminance of light when the 64 regions are expected to emit is BU '~ B88', the light sources 352 on 64 regions emitting alone directly above the light emission luminance of the light source 352 is set Bou~ Bo88, the emission luminance Bu'~Bss' using FIG. 16 (a) represented by the formula (12) obtained, emission luminance can Bou~Boss FIG 16 (B) are shown formula (13) is calculated. 进而,若一般化为在水平方向及垂直方向双方上分割为n个区域(n为 Further, if generalization, both horizontal and vertical directions is divided into n regions on the (n is

2以上的整数),则发光亮度BOu〜BOn,n可以利用发光亮度Bu'〜BV An integer of 2 or more), the emission luminance BOu~BOn, n may be utilized emission luminance Bu'~BV

根据图n所示的公式(14)进行计算。 N is calculated according to the formula shown in FIG. (14). 虽然省略了图示,但是在水平 Although not shown, the horizontal

方向上分割为nh个区域(nh为2以上的整数)、在垂直方向上分割为nv个区域(nv为2以上的整数,并且是与nh不同的值)的情况下, 同样也可以通过使用矩阵运算式,正确地计算出各光源352应该发出的光的发光亮度。 The case is divided into nh regions direction (nh is the integer 2 or more), is divided in the vertical direction nv regions (nv is an integer of 2 or more, and is nh different values), the same can also use a matrix equation, correctly calculated light emission luminance of each light source 352 to be emitted.

返回图1,从控制部50供给发光亮度运算部22中使用的衰减系数k、 m。 Returning to Figure 1, the attenuation coefficients 22 used in arithmetic unit 50 is supplied emission luminance control unit k, m. 衰减系数k、 m可以任意改变。 The attenuation coefficient k, m may be arbitrarily changed. 表示如上得到的背光装置35 的多个区域中的各光源352应该发出的光的发光亮度的数据,供给到白平衡调整部23。 Data representing the light emission luminance of light sources 352 of the respective plurality of regions 35 in the backlight device should send obtained as described above, is supplied to the white balance adjustment section 23. 向白平衡调整部23输入从温度传感器37输出的表示背光装置35的温度的温度数据和从颜色传感器38输出的表示从背光装置35发出的光的色温的色温数据。 A white balance adjustment section 23 is input to the color temperature data showing the color temperature of the light emitted from the backlight device 35 represents temperature data of the temperature of backlight device 35 output from the temperature sensor 37 and an output from the color sensor 38 from.

如上所述,若背光装置35的温度变化,则从LED (特别是R的LED)发出的光的亮度变化。 As described above, if the temperature change of the backlight device 35, light from the LED luminance change (particularly the R LED) emitted. 因此,白平衡调整部23在光源352为三色LED时根据温度数据和色温数据,对R、 G、 B的LED的光量进行调整,调整为最佳的白平衡。 Thus, the white balance adjustment unit 23 based on the temperature data and the color temperature data, R, G, LED B an amount of light is adjusted when the LED light source 352 into three colors, white balance is adjusted to the optimum. 另外,背光装置35的白平衡也可以根据 Further, the white balance of backlight device 35 may be in accordance with

从控制部50供给的外部控制信号Sctl进行调整。 Adjusting the external control signal supplied from the control unit 50 Sctl. 另外,在光源352的温度变化或长时间后产生的变化引起的背光的白平衡的变化小时,也可以去除白平衡调整部23。 Further, due to variations in the light source or temperature change in time of 352 hours change generated backlight white balance, the white balance adjustment unit can also be removed 23.

从白平衡调整部23输出的表示背光装置35的多个区域上的各光源352应该发出的光的发光亮度的数据供给到PWM时序产生部24。 Light emission luminance data from the respective light sources 352 on multiple regions of backlight device showing a white balance adjusting part 35 of the output 23 should be sent to the supplied PWM timing generator 24. 在光源352为LED时,各种颜色的LED的发光例如根据脉冲宽度被调制的脉冲宽度调制信号被控制。 When the light source 352 is a LED, LED light emission of various colors, for example, is controlled according to a pulse width modulation signal pulse width is modulated. PWM时序产生部24将包含产生脉冲宽度调制信号的时序、和用于调整发光量(发光时间)的脉冲宽度的PWM时序数据供给到背光驱动部36。 PWM timing generator 24 generates a pulse width modulation comprises a timing signal, and for supplying adjusted light emission amount (light emission time) of a pulse width of PWM timing data to the backlight driving section 36. 背光驱动部36根据输入的PWM 时序数据,产生作为脉冲宽度调制信号的驱动信号,对背光装置35的光源352 (LED)进行驱动。 The backlight driving unit 36 ​​based on the PWM timing data input, generates a drive signal as a pulse width modulated signal, a light source 352 (LED) backlight device 35 is driven.

在此,表示了通过脉冲宽度调制信号驱动LED的例子,但是也可以通过调整流过LED的电流值对LED的发光亮度进行控制。 Here, the LED shows an example of the drive signal by pulse width modulation, but emission luminance of the LED may be controlled by adjusting the current value flowing through the LED. 此时,可以设置产生用于决定LED上流过电流的时序和电流值的时序数据的时序产生部,以代替PWM时序产生部24。 At this time, it may be provided to generate the timing for deciding the timing of flowing LED and a current value of the current time series data generating section, instead of PWM timing generator 24. 此外,在光源352为LED以外的光源时,可以进行与光源的种类对应的发光量的控制,可以使用产生与光源的种类对应的时序数据的时序产生部。 Further, when the light source other than an LED light source 352, light emission may be performed with an amount corresponding to the control type of light source may be a timing corresponding to the kind of light source generates a timing data generation unit.

在图1中,背光亮度控制部20与控制部50独立,但是也可以在控制部50中设置背光亮度控制部20内的电路的全部或一部分。 In Figure 1, the control unit 20 and the backlight luminance control unit 50 independently, but may be all or part of the circuit 20 is provided in the backlight luminance control unit 50 in the control unit. 此外, 图1的结构中例如最大灰度检测部11、影像增益运算部12、及背光亮度控制部20的部分可以由硬件构成,也可以由软件构成,也可以是将两者混合的结构。 Further, the structure of FIG. 1, for example, the maximum gradation detector 11, image gain calculation unit 12, and part of backlight luminance controller 20 may be constituted by hardware or may be configured by software, or may be a mixed structure of the two. 无需另行说明,从影像信号处理部io输出的影像信号的各帧在液晶面板34上的显示、与背光亮度控制部20的与各帧的影像信号的最大亮度对应的背光亮度的控制彼此同步。 Without further description, each frame of the video signal from the video signal processing unit io outputted on the liquid crystal panel 34, the maximum brightness corresponding to the backlight of the backlight luminance control unit 20 and the video signal of each frame control synchronization with each other luminance. 在图1中省略了用于使两者同步的结构的图示。 Omitted for synchronizing both the structure in FIG. 利用图18,对以上说明的图l所示的液晶显示装置的动作、及图1所示的液晶显示装置中进行的影像显示方法的步骤进行另行说明。 FIG. 18, the above-described liquid crystal shown in FIG. L display operation device, and a liquid crystal display step shown in FIG. 1 for an image display method performed in the apparatus described otherwise. in

图18中,最大灰度检测部11在步骤S11中,对液晶面板34的多个区域的每一个区域检测影像信号的最大灰度。 18, the maximum gradation detector 11 in step S11, a maximum gradation of each of the plurality of video signal region detection regions of the liquid crystal panel 34. 影像增益运算部12在步骤S12中,运算与液晶面板34的各区域上显示的影像信号相乘的增益。 12 In step S12, the video signal for display on each region of the liquid crystal panel 34 and the calculation of the gain multiplied image gain calculator. 液晶模块30在步骤S13中,将乘以增益的各区域的影像信号显示在液晶面板34上。 The liquid crystal module 30 in step S13, the video signal is multiplied by a gain for each region on the liquid crystal display panel 34. 与该步骤S12、 S13并列地执行步骤S14〜S17。 The steps S12, S13 performed in parallel steps S14~S17.

非均匀化处理部21在步骤S14中,求得从背光装置35的多个区域应该发出的光的发光亮度B,在步骤S15中,用发光亮度B乘以系数p作为发光亮度B',以使液晶面板34的多个区域的亮度变得不均匀。 Non-uniformization processor 21 in step S14, the calculated light emission luminances B of light from multiple regions of backlight device 35 to be sent, in step S15, a light emission luminances B by a coefficient p as a light emission luminance B ', to the luminance of a plurality of regions of the liquid crystal panel 34 becomes uneven. 发光亮度运算部22在步骤S16中,根据使用了发光亮度B'和变换系数的运算式,求得背光装置35的多个区域的光源352自身应该发出的光的发光亮度Bo。 Emitting light 22 in step S16, light emission luminance calculator, according to the use of 'transform coefficients and the emission luminance B expression, to obtain a plurality of regions of backlight device 35, light sources 352 themselves should be emitted luminance Bo. 并且,PWM时序产生部24及背光驱动部36在步骤S17中,在与步骤S13同步的状态下,使背光装置35的多个区域的光源352以发光亮度Bo发光。 And, the PWM timing generator 24 and backlight driver 36 at the step S17, in step S13, the synchronization state at the light sources 352 of multiple regions of backlight device 35 to emit light emission luminance Bo.

在图1所示的结构中,求得由非均匀化处理部21实施了非均匀化处理的发光亮度B',发光亮度运算部22根据该发光亮度B'求得发光亮度Bo,但是也可以在由发光亮度运算部22求得发光亮度Bo后实施非均匀化处理。 In the configuration shown in FIG. 1, the embodiment is obtained by the non-uniformization processor 21 of the non-uniformization processor emission luminance B ', light emission luminance calculator 22 based on the light emission luminance B' obtains light emission luminance Bo, but may after the calculated light emission luminance Bo of light emission luminance calculator 22 non-uniformization processor embodiment. 即,也可以将非均匀化处理部21与发光亮度运算部22 交换。 I.e., it may be a non-uniformization processor 21 and light emission luminance calculator 22 exchange. 利用图19对此时的动作及步骤进行说明。 At this time, by using FIG. 19 and steps of operation will be described.

在图19中,步骤S21〜S23与图18的步骤S11〜S13相同。 In Figure 19, the same steps S21~S23 step 18 of FIG S11~S13. 发光亮度控制部22在步骤S24中,求得从背光装置35的多个区域应该发出的光的发光亮度B,在步骤S26中,根据使用了发光亮度B和变换系数的运算式,求得背光装置35的多个区域的光源352自身应该发出的光的发光亮度Bo。 Light emission luminance control section 22 in step S24, obtains light emission luminances B of light from multiple regions of backlight device 35 to be sent, in step S26, according to the use of light emission luminance B and a conversion coefficient calculation formula to obtain backlighting emitting light sources 352 of multiple regions of the device 35 itself should emission luminances Bo. 非均匀化处理部21在步骤S25中,用发光亮度Bo乘以系数p作为发光亮度Bo'。 Non-uniformization processor 21 in step S25, a light emission luminances Bo by the coefficient p as a light emission luminance Bo '. 并且,PWM时序产生部24及背光驱动部36在步骤S27中,在与步骤S23同步的状态下,使背光装置35的多个区域的光源352以发光亮度Bo'发光。 And, the PWM timing generator 24 and backlight driver 36 at the step S27, the state in synchronization with the next step S23, the light sources 352 of multiple regions of backlight device 35 to light emission luminance Bo 'emission.

然而,非均匀化处理部21的非均匀化处理,在想要把背光装置35的消耗电力比上述非专利文献1或上述专利文献1〜3中记载的结构进一步削减时是必需的,但是在消耗电力可以与这些文献中记载的结构相同时,也可以将非均匀化处理部21省略。 However, non-uniform non-uniformization processor 21 of the processing unit, is required when the desired power consumption of backlight device 35 to further reduce the above-described configuration than that of the Non-Patent Document 1 ~ 3 described in Patent Document 1 or, in power consumption can be described in these documents with the same structure, it may be non-uniform processing section 21 will be omitted. 利用图20对此时的动作及步骤进行说明。 At this time, 20 pairs of operations and steps will be described using FIG. 在图20中,步骤S31〜S33与图18的步骤S11〜 S13相同。 In Figure 20, the same steps S31~S33 FIG. 18 S11~ S13. 发光亮度运算部22在步骤S34中,求得从背光装置35的多个区域应该发出的光的发光亮度B,在步骤S36,根据使用了发光亮度B和变换系数的运算式,求得背光装置35的多个区域的光源352自身应该发出的光的发光亮度Bo。 22 at step S34, light emission luminance calculator, calculated light emission luminances B of light from multiple regions of backlight device 35 to be sent, at step S36, the light emission luminance B according to the use of transform coefficients and calculating formula determined backlight device emitting light sources 352 themselves of multiple regions 35 should emission luminances Bo. 并且,PWM时序产生部24及背光驱动部36在步骤S37中,在与步骤S33同步的状态下,使背光装置35的多个区域的光源352以发光亮度Bo发光。 And, the PWM timing generator 24 and backlight driver 36 at the step S37, the state in synchronization with the next step S33, so that light sources 352 of multiple regions of backlight device 35 to emit light emission luminance Bo.

如上所述,在第一实施方式涉及的液晶显示装置中,背光装置35 具有允许从多个区域各自的光源352发出的光漏出到自身区域以外的其他区域的结构,因此无需将液晶面板34和背光装置35的区域高精度地对应。 As described above, in the first embodiment of the liquid crystal display device having a backlight device 35 allows light emitted from the light source 352 of each of the plurality of regions leak to regions other than the structure of the local area, it is not necessary, and the liquid crystal panel 34 regions of backlight device 35 corresponds to high accuracy. 此外,可以根据使各区域的光源352单独发光时的光源352 自身的发光亮度Bo,正确地计算出从背光装置35的多个区域分别应该发出的发光亮度B。 Further, according to their emission luminances Bo of light sources 352 so that light sources 352 individually emit light in respective regions, and accurately calculate the emission luminance to be respectively emitted from multiple regions of backlight device 35 B. 因此,液晶面板34上的多个区域上照射的背光的亮度,可以根据该区域上显示的影像信号的明亮度精确地控制。 Therefore, the luminance is irradiated on the plurality of regions on the liquid crystal panel backlight 34 can be controlled accurately based on the brightness of the video signal on the display region.

进而,背光装置35的各区域并不是完全独立,利用考虑了从光源352发出的光漏出到自身区域以外的其他区域的结构的运算式求得发光亮度Bo,因此在液晶面板34上的多个区域中明亮度或色调不容易产生偏差,可以提高液晶面板34上显示的影像的品质。 Further, the respective regions of the backlight device 35 are not completely independent, which considers the operation of the structure of the light leaks to other regions other than the local region obtained from the light source 352 light emission luminance Bo, so a plurality of the liquid crystal panel 34 area brightness or color tone deviation is not easily generated, can improve the quality of the image displayed on the liquid crystal panel 34.

第二实施方式 Second Embodiment

图21是表示本发明的第二实施方式涉及的液晶显示装置的整体结构的框图。 21 is a block diagram showing an overall configuration of a liquid crystal device according to a second embodiment of the present invention relates to a display. 在图21中,与图l相同的部分标以同一标号,并适当省略其说明。 In Figure 21, the same parts as in FIG. L the same reference numerals, and description thereof will be omitted appropriately. 另外,在图21中,为了简化,省略了图l中的非均匀化处 Further, in FIG. 21, for simplicity, we omitted the non-uniform at Figure l

理部21,但也可以是与第一实施方式同样具有非均匀化处理部21的结构。 Processing unit 21, but may be the first embodiment has a structure of the non-uniformization processor 21.

如上所述,在第一实施方式中,根据发光亮度运算部22求得背光装置35的多个区域的光源352自身应该发出的光的发光亮度Bo,从而使多个区域的光源352发光。 As described above, in the first embodiment, the light emission luminance Bo determined according to a plurality of regions of backlight device light emission luminance calculator 2235 should be a light source 352 itself emits light, the light source 352 so that a plurality of light emitting regions. 该发光亮度Bo为各区域的中心点上的亮度值。 The light emission luminance Bo is the luminance value on the center point of each region. 图22 (A)表示仅有将背光装置35如图4 (A)所示在垂直方向上划分为4个区域的背光装置35A中的区域35b发光时的亮度分布。 FIG. 22 (A) to represent the only dividing the backlight device 35 shown in FIG. 4 (A) is in the vertical direction when the luminance distribution of regions of backlight device 35A 4 in the regions 35b to emit light. 在区域35b以图22 (A)所示的发光亮度B02发光时,在区域35a、 35c 中发光亮度为kBo2,在区域35d中发光亮度为k2802,变成图示的亮度分布。 When region 35b in FIG. 22 (A) as shown in emission luminance B02 emission, in the region 35a, 35c in luminosity kBo2, the emission luminance in region 35d k2802, the illustrated luminance distribution becomes. 从此时的区域35b的光源352发出的光的发光量,可以表示为在图22 (B)中涂上阴影线的区域。 Amount of light emitted from the light source 352 of region 35b at this time, may be represented as a hatched region coated in FIG. 22 (B). 即,图22 (B)所示的光的发光量可以表示为由图22 (A)的亮度分布表示的范围的光(光束)的积分值。 That is, FIG. 22 (B) light emission amount may be represented as shown in the light (light beam) by the integrated value of FIG. 22 (A) represents the luminance distribution range.

与根据来自各区域的光源352自身的光的发光亮度Bo求得从多个区域应该发出的光的发光亮度B相比,优选根据作为从光源352发光的积分值的光的发光量求得。 Bo is obtained compared to light emission from a plurality of light emitting regions to be emitted from the light source luminance of each area 352 itself brightness of light B, preferably determined according to the amount of light emitting from the light source 352 as integral value. 因此,在图21所示的第二实施方式中, 在发光亮度运算部22与白平衡调整部23之间,设有将发光亮度Bo转换为作为积分值的发光量Boig的发光量运算部25。 Thus, in the second embodiment shown in FIG. 21, between light emission luminance calculator 22 and white balance adjustor 23, an amount of light emission is provided to convert a light emission luminance Bo is the integral value of the light emission amount calculation unit Boig 25 . 发光量Boig可以根据从发光亮度Bo转换为发光量Boig的运算式简单地求得。 The amount of the amount of light emission may emit light Boig Boig calculation formula is obtained simply based on the conversion of light emission luminance Bo.

图23 (A)是以背光装置35A的情况为一例的运算式。 FIG 23 (A) is a case where the backlight device 35A is an example of a calculation formula. 图23 (B) 是图23 (A)所示的公式(15)中的常数S!〜S4,常数81〜34可以利用衰减系数k表示为公式(16)。 FIG. 23 (B) is a diagram 23 (A) shown in equation constants S (15) in! ~S4, 81~34 constants may be utilized as the attenuation coefficient k expressed in equation (16). 另外,图23 (A) 、 (B)用近似式来表示从发光亮度Bo转换为发光量Boig的运算式。 Further, FIG. 23 (A), (B) is represented by an approximate equation is converted to the light emission luminance Bo of light emission amount Boig expression. 例如在背光装置35A 中的区域35a发光时,液晶面板34上照射的光的积分值,可以近似地由图24所示的公式(17)表示,W的项很小,因此若将其忽略,则可以由公式(18)表示。 For example, a region 35a of backlight device 35A emits light irradiated on the liquid crystal panel 34 integral value of light, can be approximated by the equation shown in FIG. 24 (17), said small item W, and therefore if it is ignored, It can be expressed by the equation (18). 此外,在背光装置35A中的区域35b发光时,液晶面板34上照射的光的积分值,可以近似地由公式(19)表示,若将公式(19)改写,则变成公式(20)。 Further, when region 35b of backlight device 35A emits light irradiated on the liquid crystal panel 34 integral value of light can be approximately expressed by Equation (19), when the equation (19) can be rewritten, it becomes Equation (20). 在将背光装置35在垂直方向上分割为多个区域时,与位于上下端部的区域的发光亮度Bo相乘的系数s为l+k,与夹在上下端部的区域中的各区域的发光亮度Bo相乘的系数s均为(l+k) / (lk)。 When backlight device 35 is divided into a plurality of regions in the vertical direction, light emission luminances Bo by the coefficient s in the region of the upper and lower ends are multiplied it is l + k, with each region in the region interposed in the upper and lower ends of light emission luminances Bo are multiplied by a coefficient s (l + k) / (lk).

图25 (A)是根据图5、图14所示的背光装置35B时根据发光亮度Bo求得发光量Boig的运算式。 FIG 25 (A) is according to FIG 5, when backlight device 14 shown in FIG. 35B Bo emission amount determined according to an arithmetic expression Boig emission luminance. 图25 (A)所示的公式(21)中的常数Si〜S4是图23 (B)所示的公式(16),常数h〜t4可以利用衰减系数m表示为图25 (B)公式(22)。 25 (A) equation constants Si~S4 (21) is in FIG. 23 (B) of formula (16) shown in FIG constant h~t4 expressed may be utilized as the attenuation coefficient m in FIG. 25 (B) Formula ( twenty two). 在将背光装置35在水平方向及垂直方向双方上分割为多个区域时,与位于上下端部的区域的发光亮度Bo相乘的系数s为l+k,与夹在上下端部的区域中的各区域的发光亮度Bo相乘的系数s均为U+k) / (lk),与位于左右端部的区域的发光亮度Bo相乘的系数t为l+m,与夹在左右端部的区域中的各区域的发光亮度Bo相乘的系数t均为(l+m) / (lm)。 When backlight device 35 is divided into a plurality of regions on the two sides in the horizontal and vertical directions, in the region of the upper and lower ends of the emission luminance is multiplied by the coefficient s Bo l + k, with the area sandwiched in the upper and lower ends emission coefficient multiplying each area luminance Bo s are the coefficients of U + k) / (lk), in the region of the left and right ends of the light emission luminance Bo multiplied t of l + m, and left and right end portions sandwiched each of the light emitting region in the region of luminance Bo coefficient t are multiplied by (l + m) / (lm).

在图21中,从发光量运算部25输出的表示发光量Boig的数据经由白平衡调整部23供给到PWM时序产生部24。 In Figure 21, the output from the light emission amount calculation unit 25 represents the luminescence amount Boig data to PWM timing generator 24 through white balance adjustment section 23 is supplied. PWM时序产生部24, 根据表示发光量Boig的数据,产生对背光驱动部36产生的脉冲宽度调制信号的脉冲宽度进行调整的PWM时序数据。 PWM timing generator 24, in accordance with data representing the amount of light emission Boig generates PWM timing data of the pulse width of the PWM signal generated by the backlight driving unit 36 ​​for adjusting. 这样,在第二实施方式中,背光驱动部36根据背光装置35中的各区域的光源352应该发出的发光量Boig,对各区域的光源352进行驱动,因此可以比第一实施方式正确地对从多个区域应该发出的光的发光亮度B进行控制。 Thus, in the second embodiment, the backlight driving unit 36 ​​according to the amount of light emission sources 352 Boig each region of backlight device 35 to be emitted, the light source 352 is driven in each region, it is possible to correctly than the first embodiment of the control light emission luminances B of light from multiple regions are expected to emit.

另外,利用图23〜图25说明的从发光亮度Bo转换为发光量Boig 的运算式是如上所述将发光量Boig近似求得的运算式,没有完全表示作为图22 (B)所示的涂上阴影线的区域的光的积分值,但是即使是近似的运算式,也可以得到与光的积分值相当的发光量Boig。 Further, FIG. 25 described using FIG. 23~ from converts light emission luminance Bo into an amount of light emission computation formula Boig as described above approximated the light emission amount obtained Boig expression, is not fully represented as shown in FIG. 22 (B) is coated the integral value of light hatched area, but even an approximate calculation formula can be obtained with the integral value of the light emission amount corresponding to Boig. 进而,也可以利用复杂的运算式,求得更加正确的光的积分值。 Further, use may be complicated calculation formula to obtain a more correct integral value of light. 第三实施方式 Third Embodiment

图26是表示本发明的第三实施方式涉及的液晶显示装置的整体 FIG 26 is an overall liquid crystal display device of a third embodiment of the present invention relates to a display

结构的框图。 Block diagram. 在图26中,与图1相同的部分标以同一标号,并适当省略其说明。 In FIG. 26, the same parts as in FIG. 1 by the same reference numerals, and description thereof will be omitted appropriately. 另外,在图26中,为了简化,省略了图l中的非均匀化处理部21,但也可以是与第一实施方式同样具有非均匀化处理部21的结构。 Further, in FIG. 26, for simplicity, we omitted the non-uniformization processor 21 in Figure l, but may be the first embodiment has a structure of the non-uniformization processor 21. 此外,在图26中具有与第二实施方式相同的发光量运算部25,但也可以是去除发光量运算部25的结构。 Further, the second embodiment has the same manner as the light emitting amount calculation unit 25 in FIG. 26, but also may be eliminated the structure of the light emission amount calculation unit 25.

图27 (A)是液晶面板34与背光装置35A的区域35a〜35d对应地被划分为区域34a〜34d的情况,表示区域34a、 34b、 34d的灰度为0 (即黑色)且区域34c为最大灰度255 (即白色)的情况。 FIG 27 (A) is a region corresponding to the liquid crystal panel 34 35a~35d backlight device 35A is divided into regions 34a~34d, it indicates the region 34a, 34b, 34d gradation is 0 (i.e., black) and the regions 34c to the maximum gradation 255 (i.e., white). 从此时的背光装置35A的区域35a〜35d应该发出的光的发光亮度B,如图27 (B)所示为B。 Light emission luminances B of light from regions of the backlight device 35A in this case should be sent 35a~35d, shown in Figure 27 (B) is B. B2、 B3、 B4。 B2, B3, B4. 此时,背光装置35A的区域35a〜35d 的光源352自身应该发出的光的发光亮度Bo,在计算上如图27 (C) 所示为B0l、 Bo2、 Bo3、 Bo4,在区域35a、 35b、 35d变为负值。 In this case, light emission luminances Bo of regions of backlight device 35A 35a~35d should send its own light source 352 in computing FIG 27 (C) shows B0l, Bo2, Bo3, Bo4, in the region 35a, 35b, 35d becomes negative. 第三实施方式,在求得发光亮度Bo时采取了措施,以使不产生使光源352 以负的亮度值发光的不可能的状态。 The third embodiment, when taking measures to obtain light emission luminance Bo, so as not to generate a negative light source 352 light emission luminance value of an impossible state.

在将背光装置35在垂直方向上划分为n个区域时,若将上端部的区域的光源352自身应该发出的光的发光亮度设为Bop将下端部的区域的光源352自身应该发出的光的发光亮度设为Bon,将夹在上下端部的区域中的各区域的光源352自身应该发出的光的发光亮度设为Boi, 则BOp B0i、 B〜在计算上成为负值的是从各区域应该发出的光的发光亮度Bi、 Bn符合图28 (A)的公式(23)所示的条件的情况。 When backlight device 35 is divided into n regions in the vertical direction, if the emission luminance of the light source region 352 of the upper portion itself to be emitted from the light source Bop lower end portion of the region 352 themselves emitted emission luminance set to Bon, the light emission luminance of light emitted from the light source itself should be interposed in the region of each area in the upper and lower end portions 352 to Boi, the BOp B0i, B~ become negative in calculation on respective regions from light emitted from the light emitting luminance should Bi, Bn compliance (a), when the condition shown in equation (23) in FIG. 28. 如公式(23)所示,发光亮度Bo在计算上成为负值的条件由衰减系数k 决定。 As shown in equation (23), the light emission luminances Bo become negative in calculation conditions determined by the attenuation coefficient k.

因此,在第三实施方式中,在发光亮度Bi〜Bn符合公式(23)所示的条件时,在将发光亮度B!〜Bn校正为满足图28 (B)的公式(24) 的值后求得发光亮度Bo。 Therefore, in the third embodiment, the emission luminance qualified Bi~Bn shown in equation (23), and in the light emission luminance B! ~Bn corrected value satisfying the equation (24) in FIG. 28 (B) is obtains light emission luminance Bo. 不使发光亮度Bo成为负值,至少满足图28(C)的公式(25)即可。 Without light emission luminances Bo become negative, at least satisfy the equation of FIG. 28 (C) (25) can be. 如公式(24)所示,允许使发光亮度B的灰度值大于公式(25),不仅是因为为了使发光亮度Bo不成为负值而对发光亮度B进行校正,还因为也可以在视觉上不产生不良影响的范围内有目的地使发光亮度B增大。 As shown in equation (24), the light emission luminances B so allowing gradation value is greater than the formula (25), not only due to light emission luminances Bo do not become negative while the emission luminance B correction, as can be also visually on within a range not adversely affect the emission brightness B purposefully increased.

图29表示在将背光装置35在水平方向及垂直方向双方上分割为多个区域时的发光亮度Bo成为负值的条件、和发光亮度B的校正值。 FIG 29 shows the emission luminance when the backlight device 35 is divided into a plurality of regions on the two sides in the horizontal and vertical directions Bo become negative condition, and the correction of the emission luminance B value. 标在发光亮度B上的下标i表示垂直方向的任意的第i个区域,j表示水平方向的任意的第j个区域。 Superscript subscript i on the light emission luminance B denotes an arbitrary direction perpendicular to the i-th area, j denotes an arbitrary j-th horizontal area. 图29 (A)的公式(26)表示在垂直方向上排列的多个区域中发光亮度Bo在计算上成为负值的发光亮度B的条件。 FIG 29 (A) of the formula (26) represents a plurality of regions arranged in the vertical direction in the condition of light emission luminances Bo become negative in the light emission luminance B is calculated. 在发光亮度B符合公式(26)所示的条件时,将发光亮度B校正为满足图29 (B) 、 (C)的公式(27)或公式(28)的值后求得发光亮度Bo。 Light emission luminances B fall in equation (26) when the condition shown, the corrected light emission luminances B so as to satisfy 29, (C) of formula (B) is obtained after the light emission luminances Bo value (27) or formula (28).

进而,图29 (D)的公式(29)表示在水平方向上排列的多个区域中发光亮度Bo在计算上成为负值的发光亮度B的条件。 Further, FIG. 29 (D) of equation (29) represents a plurality of regions arranged in the horizontal direction in the condition of light emission luminances Bo become negative in the light emission luminance B is calculated. 如公式(29) 所示,在水平方向的情况下,发光亮度Bo在计算上成为负值的条件由衰减系数m决定。 Condition equation (29), in the case of the horizontal direction, light emission luminances Bo become negative by calculation on the attenuation coefficient m determined. 在发光亮度B符合公式(29)所示的条件时,将发光亮度B校正为满足图29 (E) 、 (F)的公式(30)或公式(31)的值后求得发光亮度Bo。 Light emission luminances B fall in equation (29) when the condition shown, the corrected light emission luminances B satisfies the equation of FIG. 29 (E), (F) after a determined light emission luminances Bo value (30) or formula (31).

图27 (D)表示将灰度值校正为不产生图27 (C)所示的负值的发光亮度Bo的发光亮度B。 FIG. 27 (D) shows a corrected gradation value is no 27 (C) negative emission luminance Bo of light emission luminance shown in Figure B. 若使用该图27 (D)所示的发光亮度B求得发光亮度Bo,则如图27(E)所示,发光亮度Bo不会是负值。 The use of the FIG. 27 (D) as shown in emission luminance B obtains light emission luminances Bo, the FIG. 27 (E), the light emission luminance Bo is not negative. 另外, 在此表示根据图28 (C)的公式(25)对发光亮度B进行校正、以使将负的发光亮度Bo校正为灰度值0的情况。 Further, in this representation (25) of the emission luminance is corrected according to the formula B in FIG. 28 (C) so that the negative case where light emission luminance Bo 0 is corrected to a gradation value.

返回图26,对第三实施方式的结构及动作进行说明。 Returning to FIG. 26, a third embodiment of the structure and operation will be described. 在图l所示的第一实施方式中,影像增益运算部12利用从最大灰度检测部11输入的表示液晶面板34的各区域的最大灰度的数据求得增益,但是图26所示的第三实施方式为如下结构。 In a first embodiment shown in Figure l, image gain calculator 12 uses the maximum gradation detector 11, said input region maximum gradation of each of the liquid crystal panel 34 to obtain gain data, but shown in FIG. 26 The third embodiment is configured as follows. 在图26中,如在图28、图29中的说明,发光亮度运算部22在发光亮度Bo是在计算上成为负值的发光亮度B时,对发光亮度B进行校正,以使发光亮度Bo在灰度值O以上。 In FIG. 26, FIG. 28 as described in FIG. 29, light emission luminance calculator 22 is a negative value of the calculated light emission luminances B in the light emission luminance Bo, B of the emission luminance is corrected, so that light emission luminance Bo gradation value or more O. 并且,发光亮度运算部22根据被校正的发光亮度B求得发光亮度Bo,供给到发光亮运算部25。 And light emission luminance calculator 22 obtains light emission luminances Bo of light emission brightness is corrected in accordance with B, is supplied to the light emission brightness calculating unit 25. 该被校正的发光亮度B被供给到影像增益运算部12。 The corrected light emission luminances B are supplied to image gain calculator 12. 影像增益运算部12根据被校正的发光亮度B,运算与影像信号相乘的增益。 Luminance image gain calculator 12 B, and calculating the gain in accordance with the video signal is multiplied by the corrected light emission.

无论在影像增益运算部12利用表示各区域的影像信号的最大灰度的数据求得增益时,还是在利用被校正的发光亮度B求得增益时, 影像增益运算部12将与用由影像信号的位数决定的影像信号所取得的最大灰度除以各区域的影像信号的最大灰度得到的值相当的值,作为对每个区域的影像信号的增益来求得。 Whether the image gain calculator 12 denotes a maximum gradation by using the video signal for each region determined gain data, or when the light emission luminances B using the calculated corrected gain, the image gain calculation unit 12 with the video signal and maximum gradation bits of the video signal of the decision made by dividing a video signal for each region maximum gradation value corresponding to a value obtained, as the gain of the video signal in each region to be obtained.

在该第三实施方式中,不需要从最大灰度检测部11向影像增益运算部12供给表示各区域的最大灰度的数据。 In this third embodiment, no data 11 represents the maximum gradations of respective regions to image gain calculator 12 is supplied from maximum gradation detector. 如在图26中用虚线的箭头表示从最大灰度检测部11至影像增益运算部12,也可以与第一实施方式同样地,从最大灰度检测部11向影像增益运算部12供给表示各区域的最大灰度的数据。 As indicated by dotted arrows in FIG. 26 indicates the maximum gradation detector 11 to image gain calculator 12 may similarly, from maximum gradation detector 11 is supplied to each of the represented image gain calculator 12 in the first embodiment maximum gradation data area. 也可以仅在发光亮度Bo在计算上成为负值时, 利用被校正的发光亮度B代替表示最大灰度的数据来求得增益。 It may be provided only when the light emission luminances Bo become negative in calculation using the corrected light emission brightness data of the maximum gradation representation instead of B for obtaining the gain.

第四实施方式 Fourth Embodiment

本发明的第四实施方式涉及的液晶显示装置的整体结构为上述第一〜第三实施方式的任意一个。 The fourth embodiment of the liquid crystal of the present invention relates to a display device according to any overall configuration of one of the first to third embodiments. 第四实施方式的结构为,对如何设置从背光装置35的光源352发出的光的亮度分布特性更为优选进行分析,并采用具有该优选的亮度分布特性的光源352。 Structure of the fourth embodiment is, more preferably, to analyze how to set the luminance distribution characteristics of light emitted from the light sources 352 of backlight device 35, and a light source having a luminance distribution characteristic of the preferred 352.

图30 (A)表示从背光装置35中的一个区域的一个光源352发出的光的亮度分布特性。 FIG 30 (A) represents a luminance distribution characteristics of light emitted from a light source 352 a region of backlight device 35. 为了容易理解,将光源352设为点光源。 For ease of understanding, the light source 352 to a point light source. 该图30 (A)所示的亮度分布特性,例如与将图4、图5的背光装置35A、35B的各区域在垂直方向上截断而观察时的特性相当。 FIG 30 (A) luminance distribution characteristics shown in, for example, the observed characteristics of the backlight device 35A of FIG. 4, FIG. 5, the regions 35B cut in the vertical direction is considerable. 在图30(A)中, 纵轴为亮度值,横轴为距光源352的距离。 In FIG. 30 (A), the vertical axis represents the luminance value, the horizontal axis represents the distance from the light source 352. 在此将亮度值的最大值(中心亮度)标准化为1并图示。 The maximum value of the luminance value (luminance center) normalized to 1 and illustrated. W为一个区域的垂直方向的宽度。 W is the width of one region in the vertical direction. 将该亮度分布特性表示的曲线设为亮度分布函数f (x)。 The luminance distribution characteristics represented by the curve is defined as the luminance distribution function f (x).

本发明人在进行了各种实验的结果发现,例如在使背光装置35的一个区域发光时,根据亮度分布函数f (x)的状态,在液晶面板34上该区域的边界被辨认出边界阶梯,损坏液晶面板34上显示的图像的画质。 The present inventors have conducted various experiments, and found, for example, a region in the backlight device 35 to emit light, the luminance distribution function f (x) state, the liquid crystal panel 34 on the boundary of the region is viewed as a boundary step , damage to the image displayed on the liquid crystal panel 34 of the image quality. 图30 (B)表示对亮度分布函数f (x)进行了微分的微分函数f' (x)。 FIG. 30 (B) represents the luminance distribution function f (x) was differentiating differential function f '(x). 实验的结果判断出,微分函数f'(x)的最大值(亮度微分函数f (x)的微分最大值)对边界阶梯的辨认度产生影响。 Analyzing the results of the experiment, the maximum differential function f '(x) (luminance differential function f (x) is the maximum differential) effect on the recognizability of the boundary step.

如下表1所示,本发明人将具有作为亮度分布特性不同的亮度分布函数f (x)的fcl〜fc8的多个光源352选择性地用于背光装置352, 对有无边界阶梯的辨认度进行了调查。 A plurality of light sources as shown in Table 1, the present invention will have a different luminance distribution characteristic of the luminance distribution function f (x) is selectively used for fcl~fc8 352 352, to identify the presence or absence of the boundary step backlight device We conducted a survey.

表1 Table 1

<table>table see original document page 37</column></row> <table> <Table> table see original document page 37 </ column> </ row> <table>

图31 (A)表示表1中的亮度分布函数fcl〜fc8内的fcl、 fc3、 fc5、 fc7、 fc8,图31 (B)表示亮度分布函数fcl、 fc3、 fc5、 fc7、 fc8的微分函数f'cl、 fc3、 f'c5、 f'c7、 f'c8。 FIG 31 (A) represents a luminance distribution function within fcl Table 1 fcl~fc8, fc3, fc5, fc7, fc8, FIG. 31 (B) represents a luminance distribution function fcl, fc3, fc5, fc7, fc8 differential function f 'cl, fc3, f'c5, f'c7, f'c8. 如表1所示,为了使区域的边界不被辨认为边界阶梯,需要使用具有如下亮度分布特性的光源352:表示微分函数f' (x)的绝对值I f' (x) I的最大值I f' (x) max I在2.0以下的亮度分布函数f (x)。 The light source shown in Table 1, in order to make the boundary region is not viewed as a boundary step, necessary to use a luminance distribution 352 of the following characteristics: indicates differential function f '(x) is the absolute value of I f' (x) I maximum I f '(x) max I distribution function f (x) in brightness of 2.0 or less. 当然,需要最大值I f' (x) maxl的下限值超过O。 Of course, the maximum required I f 'lower limit value (x) maxl exceeds O. 即,需要微分函数f'(x)的绝对值lf'(x) | 的最大值I f' (x) max i满足0< I f' (x) max |《2.0。 That is, the differential function need f '(x) is the absolute value of lf' (x) | maximum value I f '(x) max i satisfies 0 <I f' (x) max | "2.0. 在此表示了将区域在垂直方向上截断而观察时的特性,但是由于 It expresses the observed characteristics of the truncated region in the vertical direction, but due to

来自光源352的光以光源352为中心随着同心圆状地远离光源352而衰减着扩散,因此从垂直方向以外的水平方向或任意方向对来自光源352的光的亮度分布特性进行观察时均相同。 They are the same light source 352 to the center as concentrically from the light source 352 and the diffusion decay, and therefore observation of the luminance distribution characteristics from the light source 352 from the horizontal direction or any direction other than the vertical direction from the light source 352 .

这样,在第四实施方式的液晶显示装置中,作为背光装置35的光源352,使用表示亮度分布特性的曲线所表示的亮度分布函数f (x)的斜率的变化量的微分值的绝对值的最大值在2.0以下的光源,因此即使在背光装置35的多个区域内,仅使一部分区域发光,区域的边界也不会被辨认出边界阶梯,不会损坏液晶面板34上显示的图像的画质。 Thus, the liquid crystal display device of the fourth embodiment, as the light sources 352 of backlight device 35, an absolute value of a differential value representing the amount of change of the slope of the luminance distribution function f (x) curve of the luminance distribution characteristics being represented the maximum value of 2.0 or less at the light source, even in multiple regions of backlight device 35, only the portion of the boundary of the light emitting region, the region is not viewed as a boundary step, without damaging the image displayed on the liquid crystal panel 34 Videos quality.

进而,对考虑了背光装置35的消耗电力的削减效果的理想的亮度分布特性进行说明。 Further, consideration of backlight device 35 over the luminance distribution characteristic of the effect of reducing the power consumption will be described. 图32是与图30 (A)相同的亮度分布函数f (x)。 FIG 32 is the same as in FIG. 30 (A) of the luminance distribution function f (x). 如图32所示,在将光源352的中心亮度标准化为1时,来自该光源352 的光以衰减系数k漏出到相邻的区域,因此相邻的区域的中心亮度为k。 32, when the luminance of the central light source 352 is normalized to 1, the light source 352 from leaking to the attenuation coefficient k to a region adjacent to the center region adjacent the luminance thus to be k. 图33是表示衰减系数k与消耗电力相对值的关系的图。 FIG 33 is a diagram showing the relationship between an attenuation coefficient k and power consumption relative values ​​of FIG. 在图33中, 横轴为衰减系数k,纵轴为消耗电力相对值,将使背光装置35与影像信号的灰度无关地以最大的发光亮度发光时的消耗电力设为100%。 In FIG 33, the horizontal axis represents the attenuation coefficient k, the vertical axis represents the power consumption relative value, and will cause the power consumption of backlight device 35 when the light emission maximum gradation irrespective of the emission luminance of the video signal is 100%. 此外,在图33中,Imgl和Img2为表示图案彼此不同的静止画面中的衰减系数k与消耗电力相对值的关系的特性。 Further, in FIG. 33, k and power consumption characteristics of the attenuation coefficient relative value relationship Imgl and Img2 patterns different from each other to represent a still picture.

如图33所示,通过进行如第一实施方式中说明的背光装置35的亮度控制,消耗电力被削减。 As shown in FIG 33, the backlight device as described in the first embodiment of the brightness control 35, the power consumption is reduced. 此时,从图33可知,在衰减系数k为0.3 以下的范围,即使衰减系数k增加,消耗电力不会大幅度变化,但是在衰减系数k超过0.3的范围,伴随着衰减系数k的增加,消耗电力较大幅度地增大。 In this case, it is seen from FIG. 33, the attenuation coefficient k in the range of 0.3 or less, even when the attenuation coefficient k is increased, power consumption does not vary greatly over the range of attenuation coefficient k of 0.3, with the increase of the attenuation coefficient k, power consumption is significantly increased compared. 因此,若考虑背光装置35的消耗电力的削减效果,则可以说优选衰减系数k在0.3以下。 Thus, when considering the effect of reduction of power consumption of backlight device 35, it can be said that the attenuation coefficient k is preferably 0.3 or less. 在此,对垂直方向的衰减系数k进行了说明,但是对于水平方向的衰减系数m也是相同。 Here, the attenuation coefficient k in the vertical direction has been described, but for the attenuation coefficient m in the horizontal direction is the same. 即,在从多个区域各自的光源发出的光漏出到与自身区域在水平方向或垂直方向上相邻的区域时,优选将自身区域的中心亮度设为1时相邻区域的中心亮度超过0、在0.3以下。 That is, when the light leaks to the adjacent local area in the horizontal direction or the vertical direction of the region emitted from a plurality of regions each light source, preferably the central area of ​​its own luminance to the adjacent areas 1 central brightness exceeds 0 , 0.3 or less.

本发明并不限定于以上说明的第一〜第四实施方式,在不脱离本发明的要点的范围内可以进行各种变更。 The present invention is not limited to the first to fourth embodiments described above, and various modifications can be made without departing from the scope of the gist of the invention. 在第一〜第四实施方式中液晶面板34及背光装置35的多个区域的面积相同,但是也可以有目的地使面积不相同。 The same area of ​​the liquid crystal panel 34 and backlight device 35 of the plurality of regions of the first to fourth embodiments, it may be that the area does not have the same destination. 此外,除了液晶显示装置以外,出现了需要背光装置的图像显示装置时,本发明当然也可以采用到该图像显示装置中。 Further, in addition to other than the liquid crystal display device, there has been required a backlight device when the image display apparatus according to the present invention may also be used of course to the image display apparatus.

Claims (20)

1.一种液晶显示装置,其特征在于,包括: 液晶面板,显示影像信号; 背光装置,配置在上述液晶面板的背面侧,被划分为多个区域,上述多个区域分别具有发出照射上述液晶面板的光的光源,并且具有允许从上述多个区域各自的光源发出的光漏出到自身区域以外的其他区域的结构; 最大灰度检测部,按照每个预定的单位时间,对与上述背光装置的多个区域对应的上述液晶面板的多个区域上分别显示的每个区域的影像信号的第一最大灰度进行检测; 影像增益运算部,求得与用第二最大灰度除以上述第一最大灰度得到的值相当的值,作为对每个上述区域的影像信号的增益,其中所述第二最大灰度是由上述影像信号的位数决定的上述影像信号所取得的; 乘法器,用每个上述区域的影像信号乘以由上述影像增益运算部求得的上述增益,作为上述液晶面 1. A liquid crystal display device comprising: a liquid crystal panel that displays a video signal; backlight device disposed on the back side of the liquid crystal panel is divided into a plurality of regions, each having a plurality of regions irradiated with the emitted liquid light source panel, and other areas having to allow leakage of light to the outside of the local area emitted from the light source of each of the plurality of regions of the structure; the maximum gradation detector, for each predetermined unit time, of the above-described backlight device a first maximum gradation of each regional image signal displayed on each of the plurality of the plurality of regions corresponding to the liquid crystal panel is detected; image gain calculator, and a second maximum gradation is obtained by dividing the first a maximum gradation value corresponding to a value obtained, as a gain for each region of the video signal, wherein the second maximum gradation of the image signal is determined by the number of bits of the video signal acquired; multiplier , multiplied by the gain obtained by the image gain calculator video signal of each region, as the liquid crystal surface 板上显示的影像信号输出;以及发光亮度运算部,在将从上述背光装置中的上述多个区域分别发出的光的亮度设为用上述光源的最大亮度乘以由上述影像增益运算部求得的上述增益的倒数得到的第一发光亮度,并将上述背光装置中的上述多个区域的光源为得到该第一发光亮度而应该分别单独发出的光的亮度设为第二发光亮度时,利用用上述第一发光亮度乘以第一系数的运算式,求得上述第二发光亮度,其中上述第一系数基于从上述多个区域各自的光源发出的光漏出到自身区域以外的其他区域的光量。 Output image signal on the display panel; and a luminance of light emission luminance calculating unit, from said plurality of regions of the backlight device emit set by multiplying the maximum luminance of the light source obtained by the image gain calculator when the first emission luminance obtained by the reciprocal of the gain, the luminance of the light source and the plurality of areas of the backlight device to obtain the first emission luminance to be individually emitted from the second emission luminance by other regions of the light amount by the first light emission luminance by multiplying a first coefficient calculation formula to obtain the second emission luminance, wherein the first coefficient based on the light emitted from the light source of each of the plurality of regions leak to regions other than the local .
2. 根据权利要求l所述的液晶显示装置,其特征在于,包括: 发光量运算部,根据上述第二发光亮度,求得在上述背光装置中的上述多个区域分别从自身区域的光源发出并照射到上述液晶面板上的光的发光量;和背光驱动部,对上述背光装置进行驱动,以使上述背光装置中的上述多个区域各自的光源发出由上述发光量运算部得到的发光量的光。 2. The liquid crystal display device according to claim l, characterized by comprising: a light amount calculating section, based on the second emission luminance, obtained by the above plurality of regions of the backlight device emit light from their area and the amount of light irradiated on the liquid crystal panel; and a backlight drive unit for driving the backlight device, so that the plurality of regions of the backlight device emits a respective light emission amount obtained by the light emission amount calculation unit light.
3. 根据权利要求1或2所述的液晶显示装置,其特征在于, 上述发光亮度运算部,在利用上述运算式求得上述第二发光亮度时,在上述第二发光亮度在计算上为负值的情况下,以使上述第二发光亮度为0以上的值的方式对上述第一发光亮度进行校正后,求得上述第二发光亮度。 The liquid crystal or the display device of claim 12, wherein the light emission luminance calculator, when the second emission luminance is obtained using the calculation formula, in the second emission luminance is calculated on the negative if a value, so that the second emission luminance is the value of 0 or more ways of correcting the first emission luminance, the second emission luminance is obtained.
4. 根据权利要求3所述的液晶显示装置,其特征在于, 上述影像增益运算部,根据已由上述发光亮度运算部校正的上述第一发光亮度,求得上述增益。 The liquid crystal according to claim 3 of the display device, wherein the image gain calculator, based on the first emission luminance by the emission luminance calculation section above correction, the gain is obtained.
5. 根据权利要求1或2所述的液晶显示装置,其特征在于, 上述光源具有如下特性:对表示从各光源发出的光的亮度分布特性的曲线进行了微分的微分值的绝对值的最大值超过0并在2.0以下。 The maximum absolute value of a differential value of the differential representation from the curve of the luminance distribution characteristics of light emitted from the respective light sources: 5. The liquid crystal display device according to claim 1 or 2, wherein the light source has the following characteristics value of more than 0 and 2.0 or less.
6. 根据权利要求5所述的液晶显示装置,其特征在于, 上述背光装置,在从上述多个区域各自的光源发出的光漏出到与自身区域相邻的区域时,在将自身区域的中心亮度设为1时,相邻的区域的中心亮度超过0并在0.3以下。 Claim 6. The liquid crystal display device of claim 5, wherein the backlight device, when emitted from the light source of each of the plurality of regions leak to regions adjacent to the local area, the local area of ​​the central 1:00 set the brightness, the brightness of the adjacent central region is more than 0 and 0.3 or less.
7. 根据权利要求1或2所述的液晶显示装置,其特征在于, 上述运算式是矩阵运算式。 7. A liquid crystal display device according to claim 1 or 2, wherein the calculation formula is a matrix equation.
8. 根据权利要求1或2所述的液晶显示装置,其特征在于, 上述液晶面板的多个区域是将上述液晶面板在垂直方向上一维划分的区域。 8. A liquid crystal display device according to claim 1 or claim 2, wherein the plurality of regions of the liquid crystal panel is the liquid crystal panel in the vertical direction one-dimensionally divided regions.
9. 根据权利要求1或2所述的液晶显示装置,其特征在于,上述液晶面板的多个区域是将上述液晶面板在水平方向及垂直方向双方上二维划分的区域。 9. The liquid crystal or the display device of claim 12, wherein the plurality of regions of the liquid crystal panel is divided into two sides on the liquid crystal panel two-dimensionally in horizontal and vertical directions region.
10. 根据权利要求8所述的液晶显示装置,其特征在于,包括非均匀处理部,用上述背光装置的多个区域各自的上述第一发光亮度乘以第二系数,将上述第一发光亮度变得不均匀,以使从上述液晶面板中的位于一维排列的多个区域的垂直方向的中央部的区域幵始到位于上下端部的区域为止,上述液晶面板上的亮度阶梯状地降低。 According to claim 10. The liquid crystal display device 8, characterized in that the processing unit comprises a non-uniform, with a plurality of regions of the backlight device of each of the first emission luminance by multiplying a second coefficient, the first emission luminance becomes uneven, so that the region of the central portion is positioned in the vertical direction one-dimensional arrangement of a plurality of regions of the liquid crystal panel from the far starts its upper and lower ends positioned region, the luminance stepwise reduction on the liquid crystal panel .
11. 根据权利要求9所述的液晶显示装置,其特征在于, 包括非均匀处理部,用上述背光装置的多个区域各自的上述第一发光亮度乘以第二系数,将上述第一发光亮度变得不均匀,以使从上述液晶面板中的位于二维排列的多个区域的水平方向的中央部的区域开始到位于左右端部的区域为止,上述液晶面板上的亮度阶梯状地降低,并且从位于垂直方向的中央部的区域开始到位于上下端部的区域为止,上述液晶面板上的亮度阶梯状地降低。 11. The liquid crystal display device of claim 9, wherein the processing unit comprises a non-uniform, with a plurality of regions of the backlight device of each of the first emission luminance by multiplying a second coefficient, the first emission luminance becomes uneven, so that the region of the central portion from the horizontal direction two-dimensionally arrayed a plurality of regions located in the liquid crystal panel in the region of the start of the far left and right ends of the luminance stepwise on the liquid crystal panel is reduced, and starting from the region of the central portion in a vertical direction to the upper and lower ends in the region of the far portion, the luminance stepwise on the liquid crystal panel is reduced.
12. 根据权利要求10所述的液晶显示装置,其特征在于, 上述第二系数为0.8以上、lO以下的值。 12. The liquid crystal display as claimed in claim 10 said apparatus, wherein said second coefficient is 0.8 or more, less than lO value.
13. 根据权利要求ll所述的液晶显示装置,其特征在于, 上述第二系数为0.8以上、lO以下的值。 13. ll according to the liquid crystal display device as claimed in claim, wherein the second coefficient is 0.8 or more, less than lO value.
14. 根据权利要求1或2所述的液晶显示装置,其特征在于, 上述背光装置的上述光源为发光二极管。 14. A liquid crystal display device according to claim 1 or claim 2, wherein the light source of the backlight device are light emitting diodes.
15. —种影像显示方法,其特征在于,将液晶面板上显示的影像信号设为与在上述液晶面板上设定的多个区域对应的每个区域的影像信号,并按照每个预定的单位时间,对在上述多个区域上分别显示的每个区域的影像信号的第一最大灰度进行检测,求得与用第二最大灰度除以上述第一最大灰度得到的值相当的值,作为对每个上述区域的影像信号的增益,其中所述第二最大灰度是由上述影像信号的位数决定的上述影像信号所取得的,用每个上述区域的影像信号乘以上述增益,并供给到上述液晶面板,上述液晶面板的背光装置与上述液晶面板的多个区域对应地被划分为多个区域,在将从上述背光装置中的上述多个区域各自的光源发出的光的亮度设为用上述光源的最大亮度乘以上述增益的倒数得到的第一发光亮度,并将上述背光装置中的上述多个区域的光 15. - Species image display method, wherein the plurality of areas of an image signal to be displayed on the liquid crystal panel is set on the liquid crystal panel corresponding to each region of a video signal, and for each predetermined unit time, a first maximum gradation of the image signal for each region are displayed on said plurality of detection regions, the first maximum gradation is obtained with a value obtained by dividing the value corresponding to a second maximum gradation , as a gain for each of the regions of the video signal, wherein the second maximum gradation of the image signal is determined by the number of bits of the video signal acquired by multiplying the gain for each of the video signal region , and is supplied to the liquid crystal panel, the liquid crystal panel with a plurality of regions of backlight device corresponding to the liquid crystal panel is divided into a plurality of regions, the light source of each of the plurality of regions in the backlight device from the emitted the first emission luminance to a luminance obtained by multiplying the reciprocal of the gain with the maximum luminance of the light source, and the light having the plurality of regions of backlight device 源为得到该第一发光亮度而应该分别单独发出的光的亮度设为第二发光亮度时, 利用用上述第一发光亮度乘以第一系数的运算式,求得上述第二发光亮度,其中上述第一系数基于从上述多个区域各自的光源发出的光漏出到自身区域以外的其他区域的光量,使上述背光装置的多个区域各自的光源以上述第二发光亮度发光的同时,在上述液晶面板的多个区域上分别显示已乘以上述增益的每个上述区域的影像信号。 When the brightness of the light source to obtain the first emission luminance to be individually emitted from the second emission luminance, by using the above-described first emission luminance by multiplying a first coefficient arithmetic expression, the second emission luminance is obtained, wherein coefficient based on the first light emitted from the plurality of source regions of each light quantity of leaked to other areas other than the local area, so that the plurality of regions of backlight device of each of the second light source emission luminance, while, in the the plurality of regions are displayed on the liquid crystal panel a video signal is multiplied by the gain of each of the above regions.
16. —种影像显示方法,其特征在于,将液晶面板上显示的影像信号设为与在上述液晶面板上设定的多个区域对应的每个区域的影像信号,并按照每个预定的单位时间,对在上述多个区域上分别显示的每个区域的影像信号的第一最大灰度进行检测,求得与用第二最大灰度除以上述第一最大灰度得到的值相当的值,作为对每个上述区域的影像信号的增益,其中所述第二最大灰度是由上述影像信号的位数决定的上述影像信号所取得的,用每个上述区域的影像信号乘以上述增益,并供给到上述液晶面板,上述液晶面板的背光装置与上述液晶面板的多个区域对应地被划分为多个区域,在将从上述背光装置中的上述多个区域各自的光源发出的光的亮度设为用上述光源的最大亮度乘以上述增益的倒数得到的第一发光亮度,并将上述背光装置中的上述多个区域的光 16. - Species image display method, wherein the plurality of areas of an image signal to be displayed on the liquid crystal panel is set on the liquid crystal panel corresponding to each region of a video signal, and for each predetermined unit time, a first maximum gradation of the image signal for each region are displayed on said plurality of detection regions, the first maximum gradation is obtained with a value obtained by dividing the value corresponding to a second maximum gradation , as a gain for each of the regions of the video signal, wherein the second maximum gradation of the image signal is determined by the number of bits of the video signal acquired by multiplying the gain for each of the video signal region , and is supplied to the liquid crystal panel, the liquid crystal panel with a plurality of regions of backlight device corresponding to the liquid crystal panel is divided into a plurality of regions, the light source of each of the plurality of regions in the backlight device from the emitted the first emission luminance to a luminance obtained by multiplying the reciprocal of the gain with the maximum luminance of the light source, and the light having the plurality of regions of backlight device 源为得到该第一发光亮度而应该分别单独发出的光的亮度设为第二发光亮度时, 利用用上述第一发光亮度乘以第一系数的运算式,求得上述第二发光亮度,其中上述第一系数基于从上述多个区域各自的光源发出的光漏出到自身区域以外的其他区域的光量,根据上述第二发光亮度,求得在上述背光装置中的上述多个区域中分别从自身区域的光源发出并照射到上述液晶面板上的光的发光量,使上述背光装置中的上述多个区域各自的光源以上述发光量发光的同时,在上述液晶面板的多个区域上分别显示己乘以上述增益的每个上述区域的影像信号。 When the brightness of the light source to obtain the first emission luminance to be individually emitted from the second emission luminance, by using the above-described first emission luminance by multiplying a first coefficient arithmetic expression, the second emission luminance is obtained, wherein coefficient based on the first light emitted from the plurality of source regions of each light quantity of leaked to other areas other than the local area, based on the second emission luminance, obtained by the above plurality of regions of the backlight device separately from its own source region and emitted to the amount of light irradiated on the liquid crystal panel, so that the plurality of regions of the backlight device to light the light emission of each light emission amount at the same time, are already displayed on the liquid crystal panel of the plurality of regions each of said video signal multiplied by the gain of the region.
17. 根据权利要求15或16所述的影像显示方法,其特征在于, 在利用上述运算式求得上述第二发光亮度时,在上述第二发光亮度在计算上成为负值的情况下,以使上述第二发光亮度为0以上的值的方式对上述第一发光亮度进行校正后求得上述第二发光亮度。 17. A case where the image display method of claim 15 or claim 16, wherein, when the second emission luminance is obtained by the above operation expression, a negative value in the calculation in the second emission luminance to so that after the second emission luminance value of 0 or more ways of correcting the first emission luminance obtained by the second emission luminance.
18. 根据权利要求17所述的影像显示方法,其特征在于, 根据已校正的上述第一发光亮度求得上述增益。 18. The image display method according to claim 17, wherein the gain determined according to the luminance of the first light emitting corrected.
19. 根据权利要求15或16所述的影像显示方法,其特征在于,作为上述背光装置中的各光源,使具有对表示从各光源发出的光的亮度分布特性的曲线进行了微分的微分值的绝对值的最大值超过O、 并在2,0以下的特性的光源,以上述第二发光亮度发光,并且在上述液晶面板的多个区域上分别显示已乘以上述增益的每个上述区域的影像信号。 19. The image display method of claim 15 or claim 16, wherein each light source as the backlight device, so that the curve having luminance distribution characteristics indicative of light emitted from each light source is a differential value of the differential O than the maximum absolute value, and the characteristics of the light source 2,0 or less, to the second emission luminance, and each of said display area is multiplied by the gain in a plurality of regions of the liquid crystal panel, respectively, the video signal.
20. 根据权利要求19所述的影像显示方法,其特征在于,上述背光装置,在从上述多个区域各自的光源发出的光漏出到与自身区域相邻的区域时,在将自身区域的中心亮度设为1时,相邻的区域的中心亮度超过0、并在0.3以下。 20. The image display method according to claim 19, wherein said backlight device, when light leaks into the region adjacent to the local area emitted from the light source of each of the plurality of regions, in the center of the local area 1:00 to brightness, the brightness of the center region adjacent to more than 0 and 0.3 or less.
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