JP2008082938A - Color sensor and backlight controller - Google Patents

Color sensor and backlight controller Download PDF

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JP2008082938A
JP2008082938A JP2006264727A JP2006264727A JP2008082938A JP 2008082938 A JP2008082938 A JP 2008082938A JP 2006264727 A JP2006264727 A JP 2006264727A JP 2006264727 A JP2006264727 A JP 2006264727A JP 2008082938 A JP2008082938 A JP 2008082938A
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color
color temperature
filter
luminance
backlight
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JP4405995B2 (en
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Katsuhiko Kishida
克彦 岸田
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LG Display Co Ltd
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LG Philips LCD Co Ltd
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    • 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
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/041—Temperature compensation

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

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a color sensor which improves measurement precision and thus makes feedback control effectively work. <P>SOLUTION: The color sensor is equipped with: a black-body radiation filter 11 having sensitivity along a black-body locus in a range of color temperatures of 6,500-12,000 K; a Y visibility filter 12 having sensitivity in a range of color temperatures of 6,500-12,000 K; an optical sensor 13 having the filter 11 mounted for detecting the color temperature; and an optical sensor 14 having the filter 12 mounted for detecting brightness. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

この発明は、液晶表示装置等に用いられるバックライトの色温度（Ｃｏｌｏｒ Ｔｅｍｐｅｒａｔｕｒｅ）を計測するカラーセンサー及びこのカラーセンサーを使用したバックライト制御装置に関するものである。   The present invention relates to a color sensor for measuring a color temperature of a backlight used in a liquid crystal display device or the like, and a backlight control device using the color sensor.

液晶表示装置等に用いられているバックライトは、温度などの要因により発光色温度が変化する。そのため、液晶表示装置は、バックライトにカラーセンサーを組み込んで光学測定を行い、色温度を一定に保つようにフィードバック制御を行っている。   A backlight used in a liquid crystal display device or the like changes its emission color temperature due to factors such as temperature. Therefore, the liquid crystal display device performs optical measurement by incorporating a color sensor into the backlight, and performs feedback control so as to keep the color temperature constant.

従来のカラーセンサーについて図７及び図８を参照しながら説明する。図７は、従来のカラーセンサーの構成を示す図である（例えば、特許文献１参照）。また、図８は、従来のカラーセンサーのフィルターの分光感度特性を示す図である。   A conventional color sensor will be described with reference to FIGS. FIG. 7 is a diagram showing a configuration of a conventional color sensor (see, for example, Patent Document 1). FIG. 8 is a diagram showing the spectral sensitivity characteristics of the filter of the conventional color sensor.

図７において、従来のカラーセンサー９０は、等色関数フィルター９１、９２、９３と、ホトダイオードなどから構成される光センサー９４、９５、９６とが設けられている。等色関数フィルター９１が装着された光センサー９４は、赤色（Ｒ）の光強度（光量）を検出する。また、等色関数フィルター９２が装着された光センサー９５は、緑色（Ｇ）の光強度（光量）を検出する。さらに、等色関数フィルター９３が装着された光センサー９６は、青色（Ｂ）の光強度（光量）を検出する。   In FIG. 7, a conventional color sensor 90 is provided with color matching function filters 91, 92, 93 and optical sensors 94, 95, 96 composed of photodiodes or the like. The optical sensor 94 equipped with the color matching function filter 91 detects the light intensity (light quantity) of red (R). Further, the optical sensor 95 to which the color matching function filter 92 is attached detects the light intensity (light quantity) of green (G). Furthermore, the optical sensor 96 to which the color matching function filter 93 is attached detects the light intensity (light quantity) of blue (B).

図８において、横軸は波長（ｎｍ）、縦軸は相対感度である。ｘは等色関数フィルター９１の分光感度特性である。また、ｙは等色関数フィルター９２の分光感度特性である。さらに、ｚは等色関数フィルター９３の分光感度特性である。   In FIG. 8, the horizontal axis represents wavelength (nm) and the vertical axis represents relative sensitivity. x is the spectral sensitivity characteristic of the color matching function filter 91. Y is the spectral sensitivity characteristic of the color matching function filter 92. Furthermore, z is the spectral sensitivity characteristic of the color matching function filter 93.

従来のカラーセンサー９０には、上述したように、等色関数フィルター９１、９２、９３が３枚用いられている。従って、カラーセンサー９０の出力である、赤色（Ｒ）、緑色（Ｇ）、青色（Ｂ）の検出光強度から色温度ＴΔｕｖを演算している。そのため、測定誤差が大きく、十分なフィードバック制御が行われていない。これは、等色関数フィルター９１、９２、９３と黒体輻射の特性が異なるためである。   As described above, the conventional color sensor 90 uses three color matching function filters 91, 92, and 93. Therefore, the color temperature TΔuv is calculated from the detected light intensities of red (R), green (G), and blue (B), which are the outputs of the color sensor 90. Therefore, the measurement error is large and sufficient feedback control is not performed. This is because the characteristics of the black body radiation are different from those of the color matching function filters 91, 92, 93.

特開２００５−２０８４８６号公報JP-A-2005-208486

上述したような従来のカラーセンサーでは、等色関数フィルター９１、９２、９３が３枚用いられており、そのため、測定誤差が大きく、十分なフィードバック制御が行われていないという問題点があった。これは、等色関数フィルター９１、９２、９３と黒体輻射の特性が異なるためである。   In the conventional color sensor as described above, three color matching function filters 91, 92, and 93 are used. Therefore, there is a problem that measurement error is large and sufficient feedback control is not performed. This is because the characteristics of the black body radiation are different from those of the color matching function filters 91, 92, 93.

この発明は、上述のような課題を解決するためになされたもので、その目的は、測定精度を向上することができ、ひいてはフィードバック制御を有効に機能させることができるカラーセンサー及びバックライト制御装置を得るものである。   The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a color sensor and a backlight control device that can improve measurement accuracy and can effectively function feedback control. Is what you get.

この発明に係るカラーセンサーは、色温度が６５００Ｋ〜１２０００Ｋの範囲で、黒体軌跡に沿った感度を持つ黒体輻射フィルターと、色温度が６５００Ｋ〜１２０００Ｋの範囲で、感度を持つＹ視感度フィルターと、前記黒体輻射フィルターが装着され、色温度を検出する第１の光センサーと、前記Ｙ視感度フィルターが装着され、輝度を検出する第２の光センサーとを設けたものである。   The color sensor according to the present invention includes a black body radiation filter having a sensitivity along a black body locus in a color temperature range of 6500K to 12000K, and a Y visibility filter having a sensitivity in a color temperature range of 6500K to 12000K. And a first photosensor for detecting a color temperature, and a second photosensor for detecting a luminance and provided with the Y visibility filter.

この発明に係るカラーセンサーは、測定精度を向上することができ、ひいてはフィードバック制御を有効に機能させることができるという効果を奏する。   The color sensor according to the present invention can improve the measurement accuracy, and thus has an effect that the feedback control can function effectively.

実施の形態１．
この発明の実施の形態１に係るカラーセンサーについて図１から図６までを参照しながら説明する。図１は、この発明の実施の形態１に係るカラーセンサーの構成を示す図である。なお、以降では、各図中、同一符号は同一又は相当部分を示す。 Embodiment 1 FIG.
A color sensor according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing the configuration of a color sensor according to Embodiment 1 of the present invention. In the following, in each figure, the same reference numerals indicate the same or corresponding parts.

図１において、この実施の形態１に係るカラーセンサー１０は、黒体輻射フィルター１１と、Ｙ視感度フィルター１２と、光センサー１３と、光センサー１４とが設けられている。光センサー１３、１４は、ホトダイオードなどから構成される。黒体輻射フィルター１１が装着された光センサー１３は、光強度（光量）を検出する。また、Ｙ視感度フィルター１２が装着された光センサー１４は、光強度（光量）を検出する。   In FIG. 1, the color sensor 10 according to the first embodiment includes a black body radiation filter 11, a Y visibility filter 12, an optical sensor 13, and an optical sensor 14. The optical sensors 13 and 14 are composed of a photodiode or the like. The optical sensor 13 to which the black body radiation filter 11 is attached detects the light intensity (light quantity). Further, the optical sensor 14 to which the Y visibility filter 12 is attached detects the light intensity (light quantity).

光センサー１３は、色温度（Ｃｏｌｏｒ Ｔｅｍｐｅｒａｔｕｒｅ）が６５００Ｋ（Ｋｅｌｖｉｎ：ケルビン）〜１２０００Ｋの範囲で、黒体軌跡（Ｂｌａｃｋｂｏｄｙ Ｌｏｃｕｓ）に沿った光強度、すなわち色温度（黒体輻射）を検出する。また、光センサー１４は、色温度が６５００Ｋ〜１２０００Ｋの範囲で、黒体軌跡の偏差（Ｄｅｖｉａｔｉｏｎ）方向（黒体軌跡にほぼ垂直方向）に沿った光強度、すなわち輝度（Ｙ視感度）を検出する。このＹ視感度と黒体軌跡の偏差が一致することに気づいたものである。   The optical sensor 13 detects a light intensity, that is, a color temperature (black body radiation) along a black body locus (Blackbody Locus) in a color temperature range of 6500 K (Kelvin) to 12000 K. Further, the optical sensor 14 detects the light intensity, that is, the luminance (Y visibility) along the deviation direction of the black body locus (substantially perpendicular to the black body locus) in the color temperature range of 6500K to 12000K. To do. It is noticed that the Y visibility and the deviation of the black body locus coincide.

図２は、この発明の実施の形態１に係るカラーセンサーのフィルターの分光感度特性を示す図である。図２において、ａは黒体輻射フィルター１１の分光感度特性、ｂはＹ視感度フィルター１２の分光感度特性をそれぞれ示す。   FIG. 2 is a diagram showing the spectral sensitivity characteristics of the filter of the color sensor according to Embodiment 1 of the present invention. In FIG. 2, a represents the spectral sensitivity characteristic of the blackbody radiation filter 11, and b represents the spectral sensitivity characteristic of the Y visibility filter 12.

図３は、この発明の実施の形態１に係るカラーセンサーのフィルターの色度を示す図である。また、図４は、図３を拡大して示す図である。さらに、図５は、図４において色温度が６５００Ｋ〜１２０００Ｋの範囲を拡大して示す図である。図５において、ＢＬは黒体軌跡（Ｂｌａｃｋｂｏｄｙ Ｌｏｃｕｓ）、Ａは黒体輻射フィルター１１の感度範囲、ＢはＹ視感度フィルター１２の感度範囲である。   FIG. 3 is a diagram showing the chromaticity of the filter of the color sensor according to Embodiment 1 of the present invention. FIG. 4 is an enlarged view of FIG. Further, FIG. 5 is an enlarged view showing the range of the color temperature of 6500K to 12000K in FIG. In FIG. 5, BL is a black body locus, A is a sensitivity range of the black body radiation filter 11, and B is a sensitivity range of the Y visual sensitivity filter 12.

液晶表示装置等に用いられているバックライトは、温度などの要因により発光色温度が変化する。そのため、液晶表示装置は、バックライトにカラーセンサーを組込み、光学測定を行い、色温度及び輝度を一定に保つようにフィードバック制御を行っている。   A backlight used in a liquid crystal display device or the like changes its emission color temperature due to factors such as temperature. Therefore, the liquid crystal display device incorporates a color sensor in the backlight, performs optical measurement, and performs feedback control to keep the color temperature and luminance constant.

液晶表示装置のバックライトでは、色温度が６５００Ｋ〜１２０００Ｋで用いられる。この色温度の範囲の黒体軌跡ＢＬは、図４、図５に示すように、色度図上ほぼ直線で示される。従って、この直線（黒体軌跡ＢＬ）に近似するカラーフィルター、すなわち黒体輻射フィルター１１を用いることで、精度良い光学測定が可能となる。   In the backlight of the liquid crystal display device, the color temperature is 6500K to 12000K. The black body locus BL in this color temperature range is shown as a substantially straight line on the chromaticity diagram as shown in FIGS. Therefore, by using the color filter approximating this straight line (black body locus BL), that is, the black body radiation filter 11, accurate optical measurement can be performed.

Ｙ視感度フィルター１２を通過した光強度は、輝度に等しい。従って、黒体輻射フィルター１１とＹ視感度フィルター１２を通した光強度出力によって、色温度と輝度が光センサー１３と１４から正確に出力される。   The light intensity that has passed through the Y visibility filter 12 is equal to the luminance. Therefore, the color temperature and the brightness are accurately output from the optical sensors 13 and 14 by the light intensity output through the black body radiation filter 11 and the Y visibility filter 12.

この実施の形態１に係るカラーセンサーによれば、測定精度が向上し、ひいてはフィードバック制御が有効に機能する。また、フィルターを等色関数フィルター９１〜９３の３枚から黒体輻射フィルター１１とＹ視感度フィルター１２の２枚にすることができる。さらに、センサーも光センサー１３と光センサー１４の２個にすることができる。   According to the color sensor according to the first embodiment, the measurement accuracy is improved, and the feedback control functions effectively. Further, the number of filters can be changed from three of the color matching function filters 91 to 93 to two of the black body radiation filter 11 and the Y visibility filter 12. Further, the number of sensors can be two, that is, the optical sensor 13 and the optical sensor 14.

つぎに、この実施の形態１に係るカラーセンサーを使用したバックライト制御装置の動作について図面を参照しながら説明する。図６は、この発明の実施の形態１に係るカラーセンサーを使用したバックライト制御装置の構成を示すブロック図である。   Next, the operation of the backlight control apparatus using the color sensor according to the first embodiment will be described with reference to the drawings. FIG. 6 is a block diagram showing the configuration of the backlight control apparatus using the color sensor according to Embodiment 1 of the present invention.

図６において、バックライト制御装置１は、カラーセンサー１０と、目標値を設定する設定部２０とが設けられている。また、バックライト５０の色温度及び輝度を一定に保つようにフィードバック制御を行う制御部３０が設けられている。また、バックライト５０を駆動する駆動部４０が設けられている。さらに、液晶パネルの背面から赤色（Ｒ）、緑色（Ｇ）及び青色（Ｂ）の光を照射するバックライト５０が設けられている。このバックライト５０は、赤色（Ｒ）、緑色（Ｇ）及び青色（Ｂ）のＬＥＤなどから構成される。   In FIG. 6, the backlight control device 1 includes a color sensor 10 and a setting unit 20 that sets a target value. In addition, a control unit 30 that performs feedback control so as to keep the color temperature and luminance of the backlight 50 constant is provided. In addition, a drive unit 40 that drives the backlight 50 is provided. Further, a backlight 50 that irradiates red (R), green (G), and blue (B) light from the back surface of the liquid crystal panel is provided. The backlight 50 includes red (R), green (G), and blue (B) LEDs.

カラーセンサー１０は、例えばバックライト５０と液晶パネルの間に設けられ、バックライト５０の光強度を検出する。つまり、光センサー１３により、バックライト５０の色温度を検出する。また、光センサー１４により、バックライト５０の輝度を検出する。   The color sensor 10 is provided between the backlight 50 and the liquid crystal panel, for example, and detects the light intensity of the backlight 50. That is, the color temperature of the backlight 50 is detected by the optical sensor 13. Further, the brightness of the backlight 50 is detected by the optical sensor 14.

設定部２０には、色温度と輝度の目標値が予め設定されている。制御部３０は、カラーセンサー１０により検出された色温度及び輝度と、設定部２０に予め設定された色温度及び輝度の目標値をそれぞれ比較する。制御部３０は、色温度検出値と色温度目標値の差分に応じた色温度制御信号を駆動部４０に出力する。また、輝度検出値と輝度目標値の差分に応じた輝度制御信号を駆動部４０に出力する。駆動部４０は、制御部３０からの色温度制御信号及び輝度制御信号に基づいてバックライト５０を駆動する。こうして、バックライト５０の色温度及び輝度を一定（目標値）に保つようにフィードバック制御が行われる。   In the setting unit 20, target values of color temperature and luminance are set in advance. The control unit 30 compares the color temperature and luminance detected by the color sensor 10 with the target values of the color temperature and luminance preset in the setting unit 20. The control unit 30 outputs a color temperature control signal corresponding to the difference between the detected color temperature value and the target color temperature value to the drive unit 40. In addition, a luminance control signal corresponding to the difference between the luminance detection value and the luminance target value is output to the drive unit 40. The drive unit 40 drives the backlight 50 based on the color temperature control signal and the luminance control signal from the control unit 30. In this way, feedback control is performed so as to keep the color temperature and luminance of the backlight 50 constant (target values).

この発明の実施の形態１に係るカラーセンサーの構成を示す図である。It is a figure which shows the structure of the color sensor which concerns on Embodiment 1 of this invention. この発明の実施の形態１に係るカラーセンサーのフィルターの分光感度特性を示す図である。It is a figure which shows the spectral sensitivity characteristic of the filter of the color sensor which concerns on Embodiment 1 of this invention. この発明の実施の形態１に係るカラーセンサーの色度を示す図である。It is a figure which shows the chromaticity of the color sensor which concerns on Embodiment 1 of this invention. 図３を拡大して示す図である。It is a figure which expands and shows FIG. 図４において色温度が６５００Ｋ〜１２０００Ｋの範囲を拡大して示す図である。FIG. 5 is an enlarged view showing a color temperature range of 6500K to 12000K in FIG. この発明の実施の形態１に係るカラーセンサーを使用したバックライト制御装置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 backlight control apparatus using the color sensor which concerns on Embodiment 1 of this invention. 従来のカラーセンサーの構成を示す図である。It is a figure which shows the structure of the conventional color sensor. 従来のカラーセンサーのフィルターの分光感度特性を示す図である。It is a figure which shows the spectral sensitivity characteristic of the filter of the conventional color sensor.

符号の説明Explanation of symbols

１ バックライト制御装置、１０ カラーセンサー、１１ 黒体輻射フィルター、１２ Ｙ視感度フィルター、１３ 光センサー、１４ 光センサー、２０ 設定部、３０ 制御部、４０ 駆動部、５０ バックライト。   DESCRIPTION OF SYMBOLS 1 Backlight control apparatus, 10 Color sensor, 11 Black body radiation filter, 12 Y visibility filter, 13 Optical sensor, 14 Optical sensor, 20 Setting part, 30 Control part, 40 Drive part, 50 Backlight.

Claims (2)

色温度が６５００Ｋ〜１２０００Ｋの範囲で、黒体軌跡に沿った感度を持つ黒体輻射フィルターと、
色温度が６５００Ｋ〜１２０００Ｋの範囲で、感度を持つＹ視感度フィルターと、
前記黒体輻射フィルターが装着され、色温度を検出する第１の光センサーと、
前記Ｙ視感度フィルターが装着され、輝度を検出する第２の光センサーと
を備えたことを特徴とするカラーセンサー。 A black body radiation filter having a sensitivity along the black body locus in a color temperature range of 6500K to 12000K;
A Y visibility filter having a sensitivity in a color temperature range of 6500K to 12000K;
A first photosensor that is mounted with the blackbody radiation filter and detects a color temperature;
A color sensor, comprising: a second photosensor that is equipped with the Y visibility filter and detects luminance. バックライトの色温度及び輝度をカラーセンサーにより検出し、色温度検出値と色温度目標値の差分に応じた色温度制御信号及び輝度検出値と輝度目標値の差分に応じた輝度制御信号を求め、前記色温度制御信号及び輝度制御信号に基づいて前記バックライトを駆動し、前記バックライトの色温度及び輝度を目標値に保つようにフィードバック制御を行うバックライト制御装置であって、
前記カラーセンサーは、
色温度が６５００Ｋ〜１２０００Ｋの範囲で、黒体軌跡に沿った感度を持つ黒体輻射フィルターと
色温度が６５００Ｋ〜１２０００Ｋの範囲で、感度を持つＹ視感度フィルターと、
前記黒体輻射フィルターが装着され、色温度を検出する第１の光センサーと、
前記Ｙ視感度フィルターが装着され、輝度を検出する第２の光センサーと有する
ことを特徴とするバックライト制御装置。 The color temperature and luminance of the backlight are detected by a color sensor, and a color temperature control signal corresponding to the difference between the color temperature detection value and the color temperature target value and a luminance control signal corresponding to the difference between the luminance detection value and the luminance target value are obtained. A backlight control device that drives the backlight based on the color temperature control signal and the luminance control signal, and performs feedback control so as to keep the color temperature and luminance of the backlight at target values,
The color sensor is
A black body radiation filter having a sensitivity along the black body locus in a color temperature range of 6500K to 12000K, and a Y visibility filter having a sensitivity in a color temperature range of 6500K to 12000K;
A first photosensor that is mounted with the blackbody radiation filter and detects a color temperature;
A backlight control device, comprising: a second photosensor that is equipped with the Y visibility filter and detects luminance.
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CN109697954A (en) * 2019-03-06 2019-04-30 京东方科技集团股份有限公司 Display device and its luminance compensation method
WO2020238883A1 (en) * 2019-05-29 2020-12-03 京东方科技集团股份有限公司 Array substrate and display apparatus

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JP2001005437A (en) 1999-06-17 2001-01-12 Sony Corp Monitor adjusting device for information processing system
KR100751191B1 (en) * 2000-12-29 2007-08-22 엘지.필립스 엘시디 주식회사 Ferroelectric Liquid Crystal Display and Driving Method Thereof
JP2005011628A (en) * 2003-06-18 2005-01-13 Fuji Photo Film Co Ltd Lighting device and light source adjustment method of lighting device
KR20050123371A (en) * 2004-06-25 2005-12-29 주식회사 메카테크 Apparatus and method for driving lcd backlight unit using extra led

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CN109697954A (en) * 2019-03-06 2019-04-30 京东方科技集团股份有限公司 Display device and its luminance compensation method
CN109697954B (en) * 2019-03-06 2020-12-01 京东方科技集团股份有限公司 Display device and brightness compensation method thereof
WO2020238883A1 (en) * 2019-05-29 2020-12-03 京东方科技集团股份有限公司 Array substrate and display apparatus
US11778887B2 (en) 2019-05-29 2023-10-03 Boe Technology Group Co., Ltd. Array substrate and display device

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