JP5134237B2 - Liquid crystal display - Google Patents

Liquid crystal display Download PDF

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JP5134237B2
JP5134237B2 JP2006336109A JP2006336109A JP5134237B2 JP 5134237 B2 JP5134237 B2 JP 5134237B2 JP 2006336109 A JP2006336109 A JP 2006336109A JP 2006336109 A JP2006336109 A JP 2006336109A JP 5134237 B2 JP5134237 B2 JP 5134237B2
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liquid crystal
crystal display
luminance
light emission
emission control
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JP2008145964A (en
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克良 平木
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エルジー ディスプレイ カンパニー リミテッド
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0237—Switching ON and OFF the backlight within one frame
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/04—Display protection
    • G09G2330/045—Protection against panel overheating
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Computer Hardware Design (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Description

この発明は、エリアコントロールを行うためのＬＥＤバックライトを用いた液晶表示装置に関するものである。   The present invention relates to a liquid crystal display device using an LED backlight for performing area control.

従来の液晶表示装置として、画像信号に応じて画像を形成する光変調素子を有する液晶表示パネルと、前記光変調素子に画像を表示させるための照明光を照射するＬＥＤバックライトとを備え、ＬＥＤバックライトの発光領域を分割し、分割した発光領域に対応する画像データに応じて該当発光領域の輝度を制御するものがある（例えば、特許文献１参照）。   As a conventional liquid crystal display device, a liquid crystal display panel having a light modulation element that forms an image according to an image signal, and an LED backlight that emits illumination light for displaying an image on the light modulation element are provided. There is one that divides a light emitting area of a backlight and controls the luminance of the corresponding light emitting area in accordance with image data corresponding to the divided light emitting area (see, for example, Patent Document 1).

特開２００５−２５８４０３号公報JP 2005-258403 A

しかしながら、特許文献１の如く、ＬＥＤバックライトでエリアコントロールを行うと、発光領域毎にＬＥＤの累計発光時間が異なるため、ＬＥＤの劣化が発光領域毎に違いムラに見える。そのため、使用時間により表示ムラが発生するという問題点があった。   However, when the area control is performed with the LED backlight as in Patent Document 1, the accumulated light emission time of the LED is different for each light emitting region, so that the deterioration of the LED is different for each light emitting region and appears uneven. Therefore, there is a problem that display unevenness occurs depending on the usage time.

この発明は上述した点に鑑みてなされたもので、ＬＥＤの劣化による輝度低下を補正して、表示ムラが発生するのを防止できる液晶表示装置を得ることを目的とする。   The present invention has been made in view of the above-described points, and an object of the present invention is to obtain a liquid crystal display device capable of correcting a decrease in luminance due to LED deterioration and preventing display unevenness from occurring.

この発明に係る液晶表示装置は、画像信号に応じて画像を形成するための液晶表示パネルと、画像を表示させるための照明光を照射するＬＥＤバックライトとを備えた液晶表示装置において、前記ＬＥＤバックライトを複数の領域に分割した各調整領域で出力すべき設定輝度を出力する輝度調整部と、調整すべき領域の調整位置を指定する調整位置コントロール部と、調整領域の輝度を検出するフォトセンサと、前記ＬＥＤバックライトの複数の分割領域に応じて、調整領域の位置と設定輝度とによって異なる理想となる前記フォトセンサのターゲット値を予め記憶してなるテーブルと、前記フォトセンサの輝度検出値と前記ターゲット値とを比較して差分値を出力する比較手段前記調整位置に対する前記設定輝度に対応するターゲット値を予め記憶してなるテーブルと、調整領域の輝度を検出するフォトセンサと、前記フォトセンサの輝度検出値と前記ターゲット値とを比較して差分値を出力する比較手段と、前記差分値に応じて輝度調整された発光コントロール信号を出力する演算部と有する発光制御回路を備え、前記発光制御手段は、調整位置と設定輝度とに応じて前記テーブルから選択されたターゲット値と前記輝度検出値との差分値に基づいて、前記調整位置と前記設定輝度とに応じて輝度調整された発光コントロール信号を作成することを特徴とする。 The liquid crystal display device according to the present invention is a liquid crystal display device comprising a liquid crystal display panel for forming an image according to an image signal, and an LED backlight for irradiating illumination light for displaying the image. A brightness adjustment unit that outputs the set luminance to be output in each adjustment region obtained by dividing the backlight into a plurality of regions, an adjustment position control unit that specifies the adjustment position of the region to be adjusted, and a photo that detects the luminance of the adjustment region a sensor, according to a plurality of divided areas of the LED backlight, and formed by previously storing a target value of the photosensor to be different from the ideal by the position of the adjustment region and setting brightness table, the brightness of the front Symbol photosensor Comparing means for comparing the detected value with the target value and outputting a difference value Target value corresponding to the set brightness with respect to the adjustment position A table stored therein, a photosensor for detecting the brightness of the adjustment area, a comparison means for comparing the brightness detection value of the photosensor with the target value, and outputting a difference value, and according to the difference value A light emission control circuit having a calculation unit for outputting a light emission control signal whose luminance is adjusted, and the light emission control means is configured to calculate a target value selected from the table according to an adjustment position and a set luminance and the luminance detection value. Based on the difference value, a light emission control signal whose luminance is adjusted according to the adjustment position and the set luminance is created.

この発明によれば、調整領域の位置・設定輝度に応じて理想のターゲット値を選択し、実際の輝度検出値と比較した差分値に応じて輝度調整された発光コントロール信号を作成することができ、ＬＥＤの劣化による輝度低下を補正して、表示ムラが発生するのを防止できる。   According to the present invention, it is possible to select an ideal target value according to the position of the adjustment region and the set brightness, and to create a light emission control signal whose brightness is adjusted according to the difference value compared with the actual brightness detection value. It is possible to correct the decrease in luminance due to the deterioration of the LED and prevent display unevenness from occurring.

図１は、この発明の実施の形態に用いる液晶表示装置を説明する図である。図１に示すように、本実施の形態に係る液晶表示装置は、画像信号に応じて画像を形成する光変調素子（図示せず）を有する液晶表示パネル１０と、液晶表示パネル１０の背面に設けられて、前記光変調素子に画像を表示させるための照明光を照射するＬＥＤバックライト２０と、ＬＥＤバックライト２０を複数の領域に分割し分割された領域毎の輝度を検出するためのフォトセンサ３０とを備える。   FIG. 1 is a diagram for explaining a liquid crystal display device used in an embodiment of the present invention. As shown in FIG. 1, the liquid crystal display device according to the present embodiment includes a liquid crystal display panel 10 having a light modulation element (not shown) that forms an image in accordance with an image signal, and a back surface of the liquid crystal display panel 10. An LED backlight 20 that emits illumination light for displaying an image on the light modulation element, and a photo for detecting the luminance of each of the divided areas by dividing the LED backlight 20 into a plurality of areas. Sensor 30.

また、図２（ａ）、（ｂ）は、ＬＥＤバックライト２０の各分割領域の輝度検出に基づく輝度調整を説明する図である。図２（ａ）、（ｂ）に示すように、ＬＥＤバックライト２０を複数の領域に分割し、１分割領域のみ発光させ、他の分割領域は消灯させて、分割領域毎にフォトセンサ３０で輝度を検出するようにして、発光領域を順次シフトさせて分割領域毎の輝度検出に基づき輝度検出値の相関を求めることで輝度補正を可能にする。この際、装置の電源オン時、装置からの補正指令があった場合に、図２に従って補正を行い、図１に示す液晶表示パネル１０は黒表示することで、ＬＥＤの点滅が分からないようにする。   FIGS. 2A and 2B are diagrams illustrating luminance adjustment based on luminance detection of each divided region of the LED backlight 20. As shown in FIGS. 2A and 2B, the LED backlight 20 is divided into a plurality of areas, only one divided area is caused to emit light, and the other divided areas are turned off, and the photosensor 30 is used for each divided area. Luminance can be corrected by detecting the correlation of the luminance detection value based on the luminance detection for each divided region by sequentially shifting the light emitting region so as to detect the luminance. At this time, when there is a correction command from the apparatus when the apparatus is turned on, the correction is performed according to FIG. 2, and the liquid crystal display panel 10 shown in FIG. To do.

図３は、輝度調整される分割領域（以下、調整領域と称す）の輝度を検出するタイミングチャートを示す図である。図３に示すように、フォトセンサ３０を用いた調整領域の輝度の検出タイミングは、その他領域と発光タイミングを変えて、つまり非調整領域の発光コントロール信号がＯＦＦの時に、調整領域の発光コントロール信号をＯＮさせて、輝度を検出する。   FIG. 3 is a diagram illustrating a timing chart for detecting the luminance of a divided region (hereinafter referred to as an adjustment region) whose luminance is to be adjusted. As shown in FIG. 3, the luminance detection timing of the adjustment area using the photosensor 30 is different from that of the other areas, that is, when the emission control signal of the non-adjustment area is OFF, To detect the brightness.

次に、図４は、本実施の形態に係るＬＥＤバックライト２０の発光制御回路の構成を示すブロック図である。図４に示す発光制御回路４０は、ＬＥＤバックライト２０の各調整領域で出力すべき設定輝度を出力する輝度調整部４１と、ＬＥＤバックライト２０の複数の分割領域を順次シフトさせて調整すべき領域を指定するための調整位置を出力する調整位置コントロール部４２と、調整位置に対する設定輝度に対応するターゲット値（理想センサ値）を予め記憶してなり、調整位置コントロール部４２からの調整位置に対する輝度調整部４１からの設定輝度に対応するターゲット値（理想センサ値）を出力するテーブル４３と、フォトセンサ３０の検出値と、前記ターゲット値とを比較して差分値を出力する比較器４４と、前記差分値に応じて輝度調整された発光コントロール信号を出力する演算部４５とを備えている。   Next, FIG. 4 is a block diagram showing a configuration of a light emission control circuit of the LED backlight 20 according to the present embodiment. The light emission control circuit 40 shown in FIG. 4 should be adjusted by sequentially shifting a luminance adjustment unit 41 that outputs a set luminance to be output in each adjustment region of the LED backlight 20 and a plurality of divided regions of the LED backlight 20. An adjustment position control unit 42 that outputs an adjustment position for designating an area, and a target value (ideal sensor value) corresponding to the set brightness for the adjustment position are stored in advance, and the adjustment position control unit 42 outputs the adjustment position for the adjustment position. A table 43 that outputs a target value (ideal sensor value) corresponding to the set luminance from the luminance adjustment unit 41; a comparator 44 that compares the detected value of the photosensor 30 with the target value and outputs a difference value; And a calculation unit 45 that outputs a light emission control signal whose luminance is adjusted according to the difference value.

図５は、テーブル４３に予め記憶されている内容を示す図である。図５に示すように、テーブル４３には、調整位置に対する設定輝度に対応するターゲット値（理想センサ値）を予め記憶されており、例えば、調整位置が「領域１」に対する設定輝度が「７５％」として与えられる場合に、それに対応するターゲット値（理想センサ値）としては、「２２０」の値が予め記憶されている。   FIG. 5 is a diagram showing the contents stored in the table 43 in advance. As shown in FIG. 5, the table 43 stores in advance target values (ideal sensor values) corresponding to the set brightness for the adjustment position. For example, the set brightness for the adjustment position “region 1” is “75%”. ”Is stored in advance as a target value (ideal sensor value) corresponding thereto.

すなわち、図４に示す発光制御回路４０によれば、ＬＥＤバックライト２０の複数の分割領域に応じて、調整領域の位置・設定輝度によって理想となるフォトセンサ３０のターゲット値が異なるため、テーブル４３をもって理想のターゲット値を選択し、フォトセンサ３０による実際の輝度検出値と比較した差分値に応じて輝度調整された発光コントロール信号を作成することができ、ＬＥＤの劣化による輝度低下を補正して、表示ムラが発生するのを防止できる。   That is, according to the light emission control circuit 40 shown in FIG. 4, the ideal target value of the photosensor 30 differs depending on the position / set brightness of the adjustment region according to the plurality of divided regions of the LED backlight 20, and thus the table 43. To select an ideal target value, and create a light emission control signal whose luminance is adjusted according to the difference value compared with the actual luminance detection value by the photosensor 30, and correct the luminance decrease due to the deterioration of the LED. , Display unevenness can be prevented.

また、他の領域では発光していない期間に１領域のみ発光させ、フォトセンサ３０で発光量を取り込み劣化に対する補正を掛けることで、熱による輝度低下も補正することができる。   Further, by causing only one region to emit light during a period in which light is not emitted in other regions, and taking in the amount of light emitted by the photosensor 30 and applying correction for deterioration, it is possible to correct luminance reduction due to heat.

この発明の実施の形態に用いる液晶表示装置を説明する図である。It is a figure explaining the liquid crystal display device used for embodiment of this invention. ＬＥＤバックライト２０の各分割領域の輝度検出に基づく輝度調整を説明する図である。It is a figure explaining the brightness adjustment based on the brightness detection of each divided area of the LED backlight. 輝度調整される分割領域の輝度を検出するタイミングチャートを示す図である。It is a figure which shows the timing chart which detects the brightness | luminance of the division area where brightness | luminance adjustment is carried out. 本実施の形態に係るＬＥＤバックライト２０の発光制御回路の構成を示すブロック図である。It is a block diagram which shows the structure of the light emission control circuit of the LED backlight 20 which concerns on this Embodiment. テーブル４３に予め記憶されている内容を示す図である。It is a figure which shows the content previously memorize | stored in the table 43. FIG.

符号の説明Explanation of symbols

１０ 液晶表示パネル、２０ ＬＥＤバックライト、３０ フォトセンサ、４０ 発光制御回路、４１ 輝度調整部、４２ 調整位置コントロール部、４３ テーブル、４４ 比較器、４５ 演算部。   DESCRIPTION OF SYMBOLS 10 Liquid crystal display panel, 20 LED backlight, 30 Photosensor, 40 Light emission control circuit, 41 Brightness adjustment part, 42 Adjustment position control part, 43 Table, 44 Comparator, 45 Calculation part.

Claims (5)

画像信号に応じて画像を形成するための液晶表示パネルと、画像を表示させるための照明光を照射するＬＥＤバックライトとを備えた液晶表示装置において、
前記ＬＥＤバックライトを複数の領域に分割した各調整領域で出力すべき設定輝度を出力する輝度調整部と、
調整すべき領域の調整位置を指定する調整位置コントロール部と、
調整領域の輝度を検出するフォトセンサと、
前記ＬＥＤバックライトの複数の分割領域に応じて、調整領域の位置と設定輝度とによって異なる理想となる前記フォトセンサのターゲット値を予め記憶してなるテーブルと、
前記フォトセンサの輝度検出値と前記ターゲット値とを比較して差分値を出力する比較手段と、
前記差分値に応じて輝度調整された発光コントロール信号を出力する演算部と
を有する発光制御手段を備え、
前記発光制御手段は、調整位置と設定輝度とに応じて前記テーブルから選択されたターゲット値と前記輝度検出値との差分値に基づいて、前記調整位置と前記設定輝度とに応じて輝度調整された発光コントロール信号を作成する
ことを特徴とする液晶表示装置。 In a liquid crystal display device comprising a liquid crystal display panel for forming an image according to an image signal and an LED backlight for illuminating illumination light for displaying an image,
A luminance adjusting unit that outputs a set luminance to be output in each adjustment region obtained by dividing the LED backlight into a plurality of regions;
An adjustment position control unit for specifying the adjustment position of the area to be adjusted;
A photo sensor for detecting the brightness of the adjustment area;
According to a plurality of divided areas of the LED backlight , a table in which target values of the photosensors that are different depending on the position of the adjustment area and the set luminance are stored in advance ,
Comparison means for outputting a difference value by comparing the brightness detected value before Symbol photosensor and the said target value,
A light emission control means including a calculation unit that outputs a light emission control signal whose luminance is adjusted according to the difference value;
The light emission control unit adjusts the luminance according to the adjustment position and the set luminance based on a difference value between the target value selected from the table according to the adjustment position and the set luminance and the detected luminance value. A liquid crystal display device characterized by generating a light emission control signal. 請求項１に記載の液晶表示装置において、
前記調整位置コントロール部は、前記ＬＥＤバックライトを複数の分割領域を順次シフトさせて調整すべき領域の調整位置を指定する
ことを特徴とする液晶表示装置。 The liquid crystal display device according to claim 1.
The liquid crystal display device, wherein the adjustment position control unit designates an adjustment position of an area to be adjusted by sequentially shifting a plurality of divided areas of the LED backlight. 請求項１または２に記載の液晶表示装置において、
前記発光制御手段は、非調整領域の発光コントロール信号がＯＦＦの時に、調整領域の発光コントロール信号をＯＮさせて、前記フォトセンサにより調整領域の輝度を検出する ことを特徴とする液晶表示装置。 The liquid crystal display device according to claim 1 or 2,
The light emission control means turns on the light emission control signal of the adjustment area when the light emission control signal of the non-adjustment area is OFF, and detects the luminance of the adjustment area by the photosensor. 請求項１または２に記載の液晶表示装置において、
前記ＬＥＤバックライトは、前記液晶表示パネルの背面に設けられ、
前記フォトセンサは、前記ＬＥＤバックライトにおいて前記複数の分割領域中、１個の分割領域と隣接した１箇所だけに設けられ、
前記発光制御手段は、前記複数の分割領域を順次発光しながら、順次発光する分割領域のそれぞれの輝度を、前記１箇所だけに設けられたフォトセンサにより検出し、前記１個の分割領域を発光させるとき、残りの分割領域は消灯させる
ことを特徴とする液晶表示装置。 The liquid crystal display device according to claim 1 or 2,
The LED backlight is provided on the back surface of the liquid crystal display panel,
The photosensor is provided only at one location adjacent to one divided region among the plurality of divided regions in the LED backlight,
The light emission control unit detects the luminance of each of the divided regions that emit light sequentially by using a photosensor provided at only one place while sequentially emitting light from the plurality of divided regions, and emits the one divided region. The liquid crystal display device is characterized in that the remaining divided areas are extinguished. 請求項１または２に記載の液晶表示装置において、
前記発光制御手段が前記ＬＥＤバックライトの輝度を調節するとき、前記液晶表示パネルは、黒表示をする
ことを特徴とする液晶表示装置。 The liquid crystal display device according to claim 1 or 2,
When the light emission control means adjusts the brightness of the LED backlight, the liquid crystal display panel performs black display.
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