JP2003202838A - Display device - Google Patents
Display deviceInfo
- Publication number
- JP2003202838A JP2003202838A JP2002307386A JP2002307386A JP2003202838A JP 2003202838 A JP2003202838 A JP 2003202838A JP 2002307386 A JP2002307386 A JP 2002307386A JP 2002307386 A JP2002307386 A JP 2002307386A JP 2003202838 A JP2003202838 A JP 2003202838A
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- emitting element
- coefficient
- luminance
- storage means
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- G09G2320/043—Preventing or counteracting the effects of ageing
-
- 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
- G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、表示装置の発光素
子が長期間使用されることによって輝度劣化を起こした
場合でも表示映像の輝度や色度の調整を自動的に行うこ
とができる表示装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device capable of automatically adjusting the brightness and chromaticity of a display image even when the light emitting element of the display device is used for a long period of time to cause brightness deterioration. It is about.
【０００２】[0002]
【従来の技術】従来の表示装置は、設置前に発光素子群
の１ユニットずつ輝度や色度の調整を行って画面全体を
均一にした後に出荷し、輝度劣化や周囲温度による画面
の輝度低下や色度変化があった場合には、人の目で画面
を見ながら手動で補正係数を変更することにより、ユニ
ット毎の輝度の調整を行っていた。また、制御部におい
て手動で赤色（Ｒ）、緑色（Ｇ）、青色（Ｂ）の３種類
の発光素子の発光の割合を変えることによって色度の調
節を行っていた。また、図１８に示すように色温度を設
定する係数を設けることで色温度を手動で設定するよう
になっている。2. Description of the Related Art A conventional display device is shipped after adjusting the brightness and chromaticity of each unit of a light emitting element group to make the entire screen uniform before installation, and then shipped. When there is a change in chromaticity, the brightness of each unit is adjusted by manually changing the correction coefficient while observing the screen with human eyes. In addition, the chromaticity is adjusted by manually changing the light emission ratios of the three types of light emitting elements of red (R), green (G), and blue (B) in the control unit. Further, as shown in FIG. 18, the color temperature is manually set by providing a coefficient for setting the color temperature.
【０００３】この手動調整という課題を解決する手段と
しては、輝度劣化の情報を記憶手段に格納しておき、定
期的に自動で調整を行うことにより一定の画質を保つも
のが提案されている（例えば、特許文献１参照。）。As means for solving the problem of this manual adjustment, there has been proposed a method in which information on luminance deterioration is stored in a storage means and a fixed image quality is maintained by performing automatic adjustment on a regular basis ( See, for example, Patent Document 1.).
【０００４】この表示装置の調整システムは、図１３に
示すように、ＣＲＴ１０１のアノード電流を検出手段１
０２によりモニタし、そのアノード電流が低下すること
によるＣＲＴ１０１の輝度の劣化を検出手段１０２にて
検出するようになっており、この検出手段１０２の検出
結果に基づいて制御手段（テーブル選択手段）１０３が
複数の補正階調変換テーブルを記憶された記憶手段１０
４から、所望とする補正階調変換テーブルを選択するこ
とにより、階調補正手段１０５がこの選択された補正階
調変換テーブルによって画像信号Ｓの階調を変換するよ
うになっている。As shown in FIG. 13, the adjusting system of this display device has a detecting means 1 for detecting the anode current of the CRT 101.
02, the deterioration of the brightness of the CRT 101 due to the reduction of the anode current is detected by the detection means 102, and the control means (table selection means) 103 is based on the detection result of the detection means 102. Is a storage means 10 in which a plurality of correction gradation conversion tables are stored.
By selecting a desired correction gradation conversion table from 4, the gradation correction unit 105 converts the gradation of the image signal S by the selected correction gradation conversion table.
【特許文献１】特開平０９−１４６５１３号公報[Patent Document 1] Japanese Patent Laid-Open No. 09-146513
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の表示装置にあっては、色度や輝度を調整する
には、その都度、アノード電流の検出など測定を行わな
ければならない、という問題があった。However, in such a conventional display device, in order to adjust the chromaticity and the luminance, it is necessary to perform measurement such as detection of the anode current each time. was there.
【０００６】また、画面全体の輝度を調整することはで
きるが、縦横に並設した複数のユニットによって構成さ
れた映像表示板では、各ユニットの消費電力が異なる場
合には、ユニット毎に輝度劣化の差が生じ、ユニット毎
の色ムラ、輝度ムラとなって現れてしまい、このような
従来の表示装置では調整することができない、という問
題があった。Further, although it is possible to adjust the brightness of the entire screen, in a video display board composed of a plurality of units arranged vertically and horizontally, when the power consumption of each unit is different, the brightness of each unit deteriorates. However, there is a problem in that it becomes impossible to make adjustments with such a conventional display device, because the difference appears in each unit, resulting in unevenness in color and unevenness in brightness for each unit.
【０００７】さらに、従来の表示装置では、発光素子の
色毎にそれぞれ輝度劣化の傾向が異なっているために、
輝度劣化が起こるに連れて色度も変化してしまう、とい
う問題があった。Further, in the conventional display device, the tendency of deterioration in luminance differs for each color of the light emitting element.
There is a problem that the chromaticity also changes as the brightness deteriorates.
【０００８】さらに、発光素子の輝度が温度によって変
化してしまうために、表示装置の周囲温度によっても上
記と同様に輝度、色度が変化してしまう、という問題が
あった。Further, since the brightness of the light emitting element changes with temperature, there is a problem that the brightness and chromaticity also change with the ambient temperature of the display device as described above.
【０００９】さらに、色温度設定の係数については、輝
度に関係なく同じ係数を用いているため、輝度が高い場
合と低い場合に生じた温度差によって色度が変化してし
まうという問題があった。Further, since the same coefficient is used for the color temperature setting regardless of the brightness, there is a problem that the chromaticity changes due to the temperature difference generated when the brightness is high and when the brightness is low. .
【００１０】本発明は、このような問題を解決するため
になされたもので、測定を行うことなく、一定の色度や
輝度で映像等を表示することができる表示装置を提供す
るものである。The present invention has been made to solve such a problem, and provides a display device capable of displaying an image or the like with constant chromaticity and luminance without performing measurement. .
【００１１】[0011]
【課題を解決するための手段】本発明の表示装置は、複
数の発光素子の配列からなる発光素子群と、前記発光素
子群により表示される映像を調整するための係数を記憶
する係数記憶手段と、前記発光素子群に映像を表示する
ための表示データおよび前記係数記憶手段に記憶された
係数に基づいて前記発光素子群を発光させる発光制御手
段と、運用を開始してからの運用時間を記憶する運用時
間記憶手段と、前記発光素子群の発光を制御するための
設定値を記憶する設定記憶手段と、前記設定記憶手段に
記憶された設定値および前記表示データに基づいて前記
発光素子の発光を制御する表示信号制御手段とを備え
て、前記発光制御手段は前記運用時間記憶手段に記憶さ
れた運用時間を用いて前記複数の発光素子の発光を制御
する構成を有している。A display device of the present invention is a coefficient storage means for storing a light emitting element group consisting of an array of a plurality of light emitting elements and a coefficient for adjusting an image displayed by the light emitting element group. And a light emission control means for causing the light emitting element group to emit light based on display data for displaying an image on the light emitting element group and a coefficient stored in the coefficient storage means, and an operation time from the start of operation. Operating time storage means for storing, setting storage means for storing setting values for controlling light emission of the light emitting element group, and the setting values stored in the setting storage means and the display data of the light emitting elements based on the display data. And a display signal control unit for controlling light emission, wherein the light emission control unit has a configuration for controlling light emission of the plurality of light emitting elements by using the operation time stored in the operation time storage unit. .
【００１２】このような構成により、発光素子の輝度劣
化により色度が変化してしまっても、３種類の発光素子
それぞれの輝度劣化カーブと運用時間からそれぞれの輝
度劣化比率を求めて、各素子の輝度劣化比率が等しくな
るように補正係数を調整することができ、発光素子の輝
度劣化によって変化した色度を自動的に調整することが
できる。したがって、発光素子の劣化の程度の測定を行
わなくても一定の色度で映像等を表示することができる
表示装置を提供することができる。With such a configuration, even if the chromaticity changes due to the deterioration of the luminance of the light emitting element, the luminance deterioration ratio of each of the three types of light emitting elements and the luminance deterioration ratio of each of the three types of light emitting elements are obtained, and each element is obtained. It is possible to adjust the correction coefficient so that the luminance deterioration ratios are equal, and it is possible to automatically adjust the chromaticity changed due to the luminance deterioration of the light emitting element. Therefore, it is possible to provide a display device capable of displaying an image or the like with constant chromaticity without measuring the degree of deterioration of the light emitting element.
【００１３】また、本発明の表示装置は、上記発明の特
定事項に加えて、前記発光制御手段は、前記運用時間記
憶手段を用いて前記発光素子毎の輝度劣化比率を算出
し、前記複数の発光素子の輝度劣化比率を等しくする補
正係数で前記複数の発光素子の発光を制御する構成を有
することにより、平均電力を考慮した輝度劣化カーブと
運用時間から輝度劣化比率を求めることができ、そのデ
ータを用いて調整することによって、より高い精度で色
度を調整することができる。Further, in the display device of the present invention, in addition to the specific items of the above invention, the light emission control means calculates a luminance deterioration ratio for each of the light emitting elements by using the operating time storage means, By having a configuration that controls the light emission of the plurality of light emitting elements with a correction coefficient that equalizes the luminance deterioration ratio of the light emitting elements, the luminance deterioration ratio can be obtained from the luminance deterioration curve considering the average power and the operating time. By adjusting using the data, the chromaticity can be adjusted with higher accuracy.
【００１４】また、本発明の表示装置は、上記発明の特
定事項に加えて、縦横に前記発光素子群を並設すると共
に前記発光素子の電流対輝度特性を格納する前記係数記
憶手段を配設された複数のユニットによって構築された
映像表示板を備えて、前記各ユニットの前記係数記憶手
段に格納された前記発光素子の電流対輝度特性と前記電
力計測手段により取得した前記平均電力情報とを用いて
前記各ユニット毎に消費電力を算出し、その算出結果と
前記運用時間記憶手段より取得した運用時間情報を用い
て前記各ユニットそれぞれの前記補正係数を求めて前記
係数記憶手段に格納し、その補正係数を用いて電流値を
制御し、前記ユニット毎に色度を調整する構成を有する
ことにより、各ユニット毎に発光素子の輝度劣化によっ
て生じた色度のバラツキを自動的に調整することがで
き、色ムラのない均一な画質で映像等を表示することが
できる。このとき、前記ユニット毎に算出した前記輝度
劣化比率の最低のものに他の全ての前記ユニットの輝度
劣化比率を合せるように前記各ユニットの前記補正係数
を求めて前記ユニット毎の前記係数記憶手段に格納し、
その補正係数を用いて電流値を加減し、前記ユニット毎
に輝度を調整するように構成するのが好適である。In addition to the specific features of the invention, the display device of the present invention has the light emitting element groups arranged in rows and columns and the coefficient storage means for storing the current-luminance characteristics of the light emitting elements. An image display plate constructed by a plurality of units, the current-brightness characteristics of the light-emitting element stored in the coefficient storage means of each unit and the average power information obtained by the power measuring means. The power consumption is calculated for each of the units by using the calculation result and the operating time information acquired from the operating time storage means, and the correction coefficient of each of the units is obtained and stored in the coefficient storage means, By controlling the current value using the correction coefficient and adjusting the chromaticity for each unit, the chromaticity variation caused by the deterioration of the luminance of the light emitting element is caused for each unit. Month can be automatically adjusted, it is possible to display an image such as a uniform image quality free from color unevenness. At this time, the correction coefficient of each unit is calculated so that the lowest luminance deterioration ratio calculated for each unit is matched with the luminance deterioration ratios of all other units, and the coefficient storage unit for each unit is obtained. Stored in
It is preferable to adjust the brightness for each unit by adjusting the current value using the correction coefficient.
【００１５】また、本発明の表示装置は、上記発明の特
定事項に加えて、前記ユニット毎に算出した前記輝度劣
化比率の最低のものに他の全ての前記ユニットの輝度劣
化比率を合せるように前記各ユニットの前記補正係数を
求めて前記ユニット毎の前記係数記憶手段に格納し、そ
の補正係数を用いて電流値を加減し、前記ユニット毎に
輝度を調整する構成を有する。これにより、ユニット毎
に発光素子の輝度劣化によって生じた色度のバラツキを
自動的に調整することができ、色ムラのない均一な画質
で映像等を表示することができる。Further, in addition to the particulars of the above invention, the display device of the present invention is adapted to match the luminance deterioration ratios of all the other units to the lowest one of the luminance deterioration ratios calculated for each unit. The correction coefficient of each unit is obtained and stored in the coefficient storage means for each unit, and the current value is adjusted using the correction coefficient to adjust the brightness for each unit. As a result, it is possible to automatically adjust the variation in chromaticity caused by the luminance deterioration of the light emitting element for each unit, and it is possible to display an image or the like with uniform image quality without color unevenness.
【００１６】さらに、本発明の表示装置は、複数の発光
素子の配列からなる発光素子群と、前記発光素子群に流
れる電流の量を加減するための係数を格納する係数記憶
手段と、前記発光素子群に映像等を表示するための表示
データと前記係数記憶手段に格納された前記係数に基づ
いて前記発光素子群を発光させる発光制御手段と、運用
を開始してから調整タイミングまでの運用時間を記録す
る運用時間記憶手段と、前記発光素子群の発光を制御す
るための設定値を格納する設定記憶手段と、前記設定記
憶手段に格納された前記設定値および前記表示データに
基づいて前記発光素子群の発光を制御する表示信号制御
手段とを備えて、前記発光素子群の各色の輝度の比率を
変えて色度を調整するための前記設定記憶手段に格納さ
れた設定値を変更することにより、前記発光素子の電流
値を制御し、前記発光素子の輝度、色度を調整する構成
を有している。Further, in the display device of the present invention, a light emitting element group consisting of an array of a plurality of light emitting elements, a coefficient storing means for storing a coefficient for adjusting the amount of current flowing through the light emitting element group, and the light emission. Light emission control means for causing the light emitting element group to emit light based on display data for displaying an image or the like on the element group and the coefficient stored in the coefficient storage means, and operating time from start of operation to adjustment timing Operating time storage means for recording, a setting storage means for storing a set value for controlling light emission of the light emitting element group, and the light emission based on the set value and the display data stored in the setting storage means. Display signal control means for controlling the light emission of the element group, and changing the set value stored in the setting storage means for adjusting the chromaticity by changing the ratio of the brightness of each color of the light emitting element group. The Rukoto, controls the current value of the light emitting element, luminance of the light emitting element has a structure for adjusting the chromaticity.
【００１７】このような構成により、発光素子の輝度劣
化により色度が変化してしまっても、３種類の発光素子
それぞれの輝度比率を変えて色度を調整することがで
き、発光素子の輝度劣化によって変化した色度を自動的
に調整することができる。したがって、発光素子の劣化
の程度の測定を行わなくても一定の色度で映像等を表示
することができる表示装置を提供することができる。With such a configuration, even if the chromaticity changes due to the deterioration of the luminance of the light emitting element, the chromaticity can be adjusted by changing the luminance ratio of each of the three types of light emitting elements. The chromaticity changed due to deterioration can be automatically adjusted. Therefore, it is possible to provide a display device capable of displaying an image or the like with constant chromaticity without measuring the degree of deterioration of the light emitting element.
【００１８】さらに、本発明の表示装置は、複数の発光
素子の配列からなる発光素子群と、前記発光素子群に流
す電流の量を記憶する係数記憶手段と、前記発光素子群
の周囲温度を計測する温度計測手段と、前記発光素子群
の発光を制御するための設定値および前記発光素子の温
度対輝度特性を格納する設定記憶手段と、前記温度計測
手段より取得した前記周囲温度の情報と前記設定記憶手
段に記憶された前記温度対輝度特性とに基づいて各前記
発光素子の輝度の変化率を算出し、算出された各前記発
光素子の輝度の変化率に応じた補正係数を求めて前記係
数記憶手段に記憶させると共に、前記設定記憶手段に格
納された前記設定値および前記表示データ並びに前記係
数記憶手段に記憶させた補正係数に基づいて前記発光素
子群の発光を制御する表示信号制御手段とを備えて、前
記表示信号制御手段は、前記補正係数に基づいて前記発
光素子の電流値を加減し、前記発光素子の輝度を前記周
囲温度に応じて制御する構成を有している。Further, in the display device of the present invention, a light emitting element group consisting of an array of a plurality of light emitting elements, a coefficient storing means for storing the amount of current flowing through the light emitting element group, and an ambient temperature of the light emitting element group are stored. Temperature measuring means for measuring, setting storage means for storing a set value for controlling light emission of the light emitting element group and temperature-luminance characteristics of the light emitting elements, and information on the ambient temperature acquired from the temperature measuring means The rate of change in luminance of each of the light emitting elements is calculated based on the temperature-luminance characteristic stored in the setting storage means, and a correction coefficient is calculated according to the calculated rate of change in luminance of each of the light emitting elements. The light emission of the light emitting element group is controlled based on the setting value and the display data stored in the setting storage means and the correction coefficient stored in the coefficient storage means while being stored in the coefficient storage means. And a display signal control means for controlling the brightness of the light emitting element according to the ambient temperature by adjusting the current value of the light emitting element based on the correction coefficient. is doing.
【００１９】このような構成により、測定した発光素子
群の周囲温度と温度対輝度特性とに基づいて、測定した
周囲温度に応じた発光素子の輝度に制御するため、周囲
温度が変化しても一定の輝度を維持することが可能な表
示装置を提供することができる。With such a configuration, the luminance of the light emitting elements is controlled according to the measured ambient temperature based on the measured ambient temperature and the temperature-luminance characteristic of the light emitting element group, so that even if the ambient temperature changes. A display device that can maintain constant luminance can be provided.
【００２０】さらに、本発明の表示装置は、上記発明の
特定事項に加えて、前記発光素子は、赤色の発光素子、
緑色の発光素子、および青色の発光素子を含み、前記設
定記憶手段は、各前記色の発光素子の温度対輝度特性を
格納し、前記表示信号制御手段は、前記周囲温度の情報
と各前記温度対輝度特性とに基づいて各前記色の発光素
子の輝度の変化率を算出し、算出された各前記色の発光
素子の輝度の変化率に応じた色別補正係数を求めて前記
係数記憶手段に記憶させると共に、前記色別補正係数に
基づいて各前記色の発光素子それぞれの電流値を加減
し、各前記発光素子の色温度を制御する構成を有してい
る。Furthermore, in the display device of the present invention, in addition to the above-mentioned specific matters, the light emitting element is a red light emitting element,
A green light emitting element and a blue light emitting element, the setting storage means stores temperature-luminance characteristics of the light emitting element of each color, and the display signal control means controls the ambient temperature information and each temperature. The coefficient change means calculates the change rate of the luminance of the light emitting element of each color based on the anti-luminance characteristic, obtains the correction coefficient for each color according to the calculated change rate of the luminance of the light emitting element of each color, and stores the coefficient storage means. The color temperature of each light emitting element is controlled by adjusting the current value of each light emitting element of each color based on the correction coefficient for each color.
【００２１】このような構成により、測定した発光素子
群の周囲温度と発光色毎の温度対輝度特性とに基づい
て、測定した周囲温度に応じた発光素子の輝度に制御す
るため、周囲温度が変化しても一定の輝度または色度を
維持することが可能な表示装置を提供することができ
る。With such a configuration, the brightness of the light emitting element is controlled according to the measured ambient temperature based on the measured ambient temperature of the light emitting element group and the temperature-luminance characteristic for each emission color. A display device capable of maintaining constant luminance or chromaticity even when changed can be provided.
【００２２】さらに、本発明の表示装置は、上記発明の
特定事項に加えて、前記発光素子群が縦横に並設される
と共に前記係数記憶手段が配設された複数のユニットに
よって構築された映像表示板と、前記ユニット毎に前記
発光素子群の周囲温度を計測する温度計測手段とを備え
て、前記周囲温度の情報と前記温度対輝度特性とに基づ
いて各前記発光素子の輝度の変化率を算出し、算出され
た各前記発光素子の輝度の変化率に応じた補正係数を求
めて前記係数記憶手段に記憶させると共に、前記補正係
数に基づいて前記発光素子の電流値を加減し、前記ユニ
ット毎に前記発光素子の輝度を制御する構成を有してい
る。Further, in addition to the particulars of the above invention, the display device of the present invention is an image constructed by a plurality of units in which the light emitting element groups are arranged vertically and horizontally and the coefficient storage means is arranged. A display plate and a temperature measuring unit that measures the ambient temperature of the light emitting element group for each unit, and the rate of change of the luminance of each light emitting element based on the information of the ambient temperature and the temperature-luminance characteristic. And a correction coefficient corresponding to the calculated change rate of the luminance of each light emitting element is stored in the coefficient storage means, and the current value of the light emitting element is adjusted based on the correction coefficient. It has a configuration for controlling the brightness of the light emitting element for each unit.
【００２３】このような構成により、ユニット毎に測定
された発光素子群の周囲温度と発光色毎の温度対輝度特
性とに基づいて、測定した周囲温度に応じた発光素子の
輝度に制御するため、ユニット毎の周囲温度が異なる場
合でも一定の輝度を維持することが可能な表示装置を提
供することができる。With such a configuration, the luminance of the light emitting element is controlled according to the measured ambient temperature based on the ambient temperature of the light emitting element group measured for each unit and the temperature-luminance characteristic for each emission color. It is possible to provide a display device capable of maintaining a constant brightness even when the ambient temperature of each unit is different.
【００２４】さらに、本発明の表示装置は、上記発明の
特定事項に加えて、前記発光素子群が縦横に並設される
と共に前記係数記憶手段が配設された複数のユニットに
よって構築された映像表示板と、前記ユニット毎に前記
発光素子群の周囲温度を計測する温度計測手段とを備え
て、前記発光素子は、赤色の発光素子、緑色の発光素
子、および青色の発光素子を含み、前記設定記憶手段
は、各前記色の発光素子の温度対輝度特性を格納し、前
記表示信号制御手段は、前記ユニット毎に、前記周囲温
度の情報と各前記温度対輝度特性とに基づいて各前記色
の発光素子の輝度の変化率を算出し、算出された各前記
色の発光素子の輝度の変化率に応じた色別補正係数を求
めて該当するユニットの係数記憶手段に記憶させると共
に、前記ユニット毎の前記色別補正係数に基づいて各前
記色の発光素子それぞれの電流値を加減し、各前記発光
素子の色温度を制御する構成を有している。Further, in addition to the specific features of the above invention, the display device of the present invention is an image constructed by a plurality of units in which the light emitting element groups are arranged vertically and horizontally and the coefficient storage means is arranged. A display plate and a temperature measuring unit that measures the ambient temperature of the light emitting element group for each unit, the light emitting element includes a red light emitting element, a green light emitting element, and a blue light emitting element, The setting storage means stores the temperature-luminance characteristics of the light-emitting elements of the respective colors, and the display signal control means, for each unit, based on the ambient temperature information and the temperature-luminance characteristics. The change rate of the luminance of the color light emitting element is calculated, and the correction coefficient for each color according to the calculated change rate of the luminance of the light emitting element of each color is obtained and stored in the coefficient storage means of the corresponding unit, and Per unit Serial or minus the current value of each of the colors of the light emitting element based on Color correction coefficient, and has a configuration for controlling the color temperature of the light emitting element.
【００２５】このような構成により、測定した発光素子
群の周囲温度と発光色毎の温度対輝度特性とに基づい
て、測定した周囲温度に応じた発光素子の輝度に制御す
るため、周囲温度が変化しても一定の輝度または色度を
維持することが可能な表示装置を提供することができ
る。With such a configuration, the brightness of the light emitting element is controlled according to the measured ambient temperature based on the measured ambient temperature of the light emitting element group and the temperature-luminance characteristic for each emission color. A display device capable of maintaining constant luminance or chromaticity even when changed can be provided.
【００２６】さらに、本発明の表示装置は、上記発明の
特定事項に加えて、前記設定記憶手段は、さらに輝度設
定値毎に色温度を設定するための設定係数を記憶し、前
記表示信号制御手段は、指定された輝度値に対応する色
温度の予め決められた情報に基づいて各前記発光素子の
色度を指定された輝度毎に制御する構成を有している。Further, in the display device of the present invention, in addition to the specific items of the above invention, the setting storage means further stores a setting coefficient for setting a color temperature for each brightness setting value, and the display signal control is performed. The means has a configuration for controlling the chromaticity of each of the light emitting elements for each specified brightness based on predetermined information of the color temperature corresponding to the specified brightness value.
【００２７】このような構成により、輝度に応じた色温
度を実現するための情報を保持し、それに基づいて発光
素子の発光を制御するため、輝度を変化した場合でも輝
度に適した色温度が実現され、輝度の違いによる温度差
に影響されずに一定の色度で映像等を表示することが可
能な表示装置を提供することができる。With such a configuration, the information for realizing the color temperature corresponding to the brightness is held and the light emission of the light emitting element is controlled based on the information, so that the color temperature suitable for the brightness can be obtained even when the brightness is changed. It is possible to provide a display device that is realized and can display an image or the like with a constant chromaticity without being affected by a temperature difference due to a difference in luminance.
【００２８】[0028]
【発明の実施の形態】以下、本発明の実施の形態につい
て、図面を用いて説明する。
（第１の実施の形態）図１および図２において、表示装
置は、映像等を表示するユニット１０と、その表示出力
を制御する制御部２０とにより構成されており、ユニッ
ト１０は、赤発光素子１１ａ、緑発光素子１１ｂ、青発
光素子１１ｃの配列からなる画素１１を複数配設した発
光素子群１２と、表示を調整するための補正係数を格納
する係数記憶手段１３と、発光素子群１２に映像等を表
示するためのデータと係数記憶手段１３に格納した補正
係数に基づいて発光素子群１２を発光させる発光制御手
段１４とを備え、制御部２０は、装置全体を統括制御す
るＣＰＵ２１と、使用開始からの運用時間等を管理する
運用時間記憶手段２２と、発光素子１１ａ〜１１ｃの輝
度劣化カーブや表示を調整するための設定値を格納する
設定記憶手段２３と、設定記憶手段２３に格納された設
定値や映像信号Ｓに基づいてユニット１０での発光を制
御する表示信号制御手段２４とを備えている。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) In FIGS. 1 and 2, a display device comprises a unit 10 for displaying images and the like, and a control unit 20 for controlling the display output thereof. The unit 10 emits red light. A light emitting element group 12 in which a plurality of pixels 11 each having an array of an element 11a, a green light emitting element 11b, and a blue light emitting element 11c are arranged, a coefficient storage unit 13 for storing a correction coefficient for adjusting display, and a light emitting element group 12 And a light emission control means 14 for causing the light emitting element group 12 to emit light based on the correction coefficient stored in the coefficient storage means 13, and the control unit 20 includes a CPU 21 for overall control of the entire device. The operating time storage means 22 for managing the operating time from the start of use, and the setting storage means 23 for storing the brightness deterioration curves of the light emitting elements 11a to 11c and the set values for adjusting the display. , And a display signal control means 24 for controlling light emission of the unit 10 on the basis of the set value and the video signal S stored in the setting storage unit 23.
【００２９】制御部２０では、運用時間記憶手段２２よ
り表示装置の運用時間情報Ｔを取得し、その情報Ｔに基
づいて、図３に示す輝度劣化カーブからその運用時間Ｔ
に応じた輝度劣化比率Ｘ％（運用開始時の輝度を１００
％としたときの劣化比率）を求める（例えば、３０００
０時間で、輝度劣化比率５０％となる）。The control unit 20 obtains the operating time information T of the display device from the operating time storage means 22, and based on the information T, the operating time T from the brightness deterioration curve shown in FIG.
Luminance deterioration ratio X% (luminance at the start of operation is 100%
Deterioration ratio (%) (for example, 3000
The luminance deterioration ratio becomes 50% at 0 hours).
【００３０】これに対して、ユニット１０の発光素子
（ＬＥＤ）１１ａ〜１１ｃは、図４に示すように、電流
の量を増加することでいずれのランクＡ〜Ｃのものでも
輝度が高くなることから、発光素子群１２の発光素子１
１ａ〜１１ｃに流れる電流は、図５に示すように、発光
制御手段１４に与える表示データと補正係数を演算する
ことで決定し、その結果をＤ／Ａ変換することで電流値
を得る。On the other hand, as shown in FIG. 4, the light emitting elements (LEDs) 11a to 11c of the unit 10 have higher brightness by increasing the amount of current, regardless of ranks A to C. From the light emitting element 1 of the light emitting element group 12
As shown in FIG. 5, the currents 1a to 11c are determined by calculating the display data and the correction coefficient given to the light emission control means 14, and the result is D / A converted to obtain the current value.
【００３１】また、図６に示すように、発光素子１１ａ
〜１１ｃの種類によって輝度劣化カーブが異なった場
合、各素子の輝度劣化比率（ＸＲ％、ＸＧ％、ＸＢ％）
を算出する。Further, as shown in FIG. 6, the light emitting element 11a
When the luminance deterioration curve is different depending on the type of ~ 11c, the luminance deterioration ratio of each element (XR%, XG%, XB%)
To calculate.
【００３２】ここで求めた値から、例えば、図７に示す
ように最も低いＸＧ％に他のＸＲ％、ＸＢ％の値を揃え
るための電流の補正係数を求めてユニット１０の係数記
憶手段１３に格納し、その補正係数を用いて発光制御手
段１４から発光素子群１２へ流れる電流値を制御するこ
とによって発光素子１１ａ〜１１ｃの輝度劣化によって
変化した色度を調整する。From the value obtained here, for example, as shown in FIG. 7, the correction coefficient of the current for making the values of other XR% and XB% equal to the lowest XG% is obtained, and the coefficient storage means 13 of the unit 10 is obtained. The chromaticity changed by the luminance deterioration of the light emitting elements 11a to 11c is adjusted by controlling the current value flowing from the light emission control unit 14 to the light emitting element group 12 using the correction coefficient.
【００３３】したがって、ユニット１０の発光素子群１
２による画面表示の色度にバラツキが出てきたときに色
度の調整を指示入力されるなどの調整タイミング時に
は、画面を見ながら発光素子１１ａ〜１１ｃの劣化の程
度に応じて手動で調整する作業を行うことなく、自動的
にその色度を調整することができる。Therefore, the light emitting element group 1 of the unit 10
2 is manually adjusted according to the degree of deterioration of the light emitting elements 11a to 11c while observing the screen at the adjustment timing, such as when an instruction is input to adjust the chromaticity when the chromaticity of the screen display varies. The chromaticity can be adjusted automatically without any work.
【００３４】このように本発明の第１の実施の形態にお
いては、発光素子１１ａ〜１１ｃの輝度劣化により色度
が変化してしまっても、発光素子１１ａ〜１１ｃそれぞ
れの輝度劣化カーブと運用時間からそれぞれの輝度劣化
比率ＸＲ％、ＸＧ％、ＸＢ％を求めて、各発光素子１１
ａ〜１１ｃの輝度劣化比率が等しくなるように電流量を
調整することができ、発光素子１１ａ〜１１ｃの輝度劣
化によって発光素子群１２の変化した色度を自動的に調
整することができる。したがって、劣化を実測する測定
を行うことなく、一定の色度で映像等を表示することが
できるように自動調整することができる。As described above, in the first embodiment of the present invention, even if the chromaticity changes due to the luminance deterioration of the light emitting elements 11a to 11c, the luminance deterioration curve and the operating time of each of the light emitting elements 11a to 11c. The respective luminance deterioration ratios XR%, XG%, and XB% are obtained from the
The amount of current can be adjusted so that the luminance deterioration ratios of a to 11c are equal, and the chromaticity changed in the light emitting element group 12 due to the luminance deterioration of the light emitting elements 11a to 11c can be automatically adjusted. Therefore, it is possible to automatically adjust so that an image or the like can be displayed with a constant chromaticity without performing measurement for actually measuring deterioration.
【００３５】（第２の実施の形態）図８は、本発明の第
２の実施の形態に係る表示装置の概略全体構成を示すブ
ロック図である。なお、本発明の第２の実施の形態に係
る表示装置の構成手段のうち、上記本発明の第１の実施
の形態に係る表示装置における構成手段と同様の処理を
行うものには同一の符号を付し、その説明を省略する。(Second Embodiment) FIG. 8 is a block diagram showing a schematic overall configuration of a display device according to a second embodiment of the present invention. It should be noted that, of the constituents of the display device according to the second embodiment of the present invention, those that perform the same processing as the constituents of the display device according to the first embodiment of the present invention have the same reference numerals. Is attached and the description thereof is omitted.
【００３６】図８において、表示装置は、ユニット１０
に接続する制御部２０に、ＣＰＵ２１、運用時間記憶手
段２２、設定記憶手段２３および表示信号制御手段２４
との間で信号情報をやり取り可能に電力計測手段２５が
設けられており、発光素子群１２（発光素子１１ａ〜１
１ｃ）の輝度劣化の度合いは消費電力によっても異なる
ため、図９に示すような運用時間と消費電力による輝度
劣化カーブを設定記憶手段２３内に格納しておき、電力
計測手段２５による計測情報に基づいて運用時間中の平
均消費電力を算出・記憶すると共に、この平均消費電力
と運用時間とから輝度劣化比率Ｘ％（ＸＲ％、ＸＧ％、
ＸＢ％）を求めることにより、より精度の高い色度の調
整を行うことができるようになっている。In FIG. 8, the display device is a unit 10
The control unit 20 connected to the CPU has a CPU 21, an operating time storage unit 22, a setting storage unit 23, and a display signal control unit 24.
A power measuring unit 25 is provided so as to be able to exchange signal information with the light emitting element group 12 (light emitting elements 11a to 1a).
Since the degree of luminance deterioration in 1c) varies depending on the power consumption, the luminance deterioration curve due to the operating time and the power consumption as shown in FIG. The average power consumption during the operating time is calculated and stored based on the average power consumption and the operating time, and the luminance deterioration ratio X% (XR%, XG%,
XB%), it is possible to perform more accurate chromaticity adjustment.
【００３７】このように本発明の第２の実施の形態で
は、本発明の第１の実施の形態の作用効果に加えて、発
光素子群１２（発光素子１１ａ〜１１ｃ）の平均消費電
力を考慮した輝度劣化カーブと運用時間から輝度劣化比
率を求めて、その発光素子群１２への電流量を制御する
ことができ、発光素子１１ａ〜１１ｃの輝度劣化によっ
て発光素子群１２の変化した色度を自動的に調整するこ
とができる。したがって、色度をより高い精度で調整す
ることができる。As described above, in the second embodiment of the present invention, in addition to the effects of the first embodiment of the present invention, the average power consumption of the light emitting element group 12 (light emitting elements 11a to 11c) is taken into consideration. The luminance deterioration ratio can be obtained from the luminance deterioration curve and the operating time, and the amount of current to the light emitting element group 12 can be controlled, and the changed chromaticity of the light emitting element group 12 due to the luminance deterioration of the light emitting elements 11a to 11c can be calculated. Can be adjusted automatically. Therefore, the chromaticity can be adjusted with higher accuracy.
【００３８】（第３の実施の形態）図１０は、本発明の
第３の実施の形態に係る表示装置の概略全体構成を示す
ブロック図である。図１０において、表示装置は、縦横
に並設した複数のユニット１０を制御部２０に接続した
映像表示板として構成されており、各ユニット１０は、
それぞれの係数記憶手段１３にそのユニット１０に使用
されている発光素子群１２（発光素子１１ａ〜１１ｃ）
の電流対輝度の特性を格納しておき、制御部２０から平
均電力情報や輝度劣化カーブを取り込んで、各ユニット
１０の平均消費電力を算出し、この結果からユニット１
０毎の補正係数を求めてそれぞれの係数記憶手段１３に
格納することにより、ユニット１０毎に発光制御手段１
４から発光素子群１２へ流れる電流の量を制御して色度
の調整を行うようになっている。(Third Embodiment) FIG. 10 is a block diagram showing a schematic overall configuration of a display device according to a third embodiment of the present invention. In FIG. 10, the display device is configured as an image display plate in which a plurality of units 10 arranged in parallel vertically and horizontally are connected to a control unit 20, and each unit 10 is
The light emitting element group 12 (light emitting elements 11a to 11c) used in the unit 10 is stored in each coefficient storage means 13.
The current-luminance characteristic of the unit 1 is stored, the average power information and the luminance deterioration curve are fetched from the control unit 20, the average power consumption of each unit 10 is calculated, and the unit 1 is calculated from this result.
By obtaining the correction coefficient for each 0 and storing it in each coefficient storage means 13, the light emission control means 1 for each unit 10 can be obtained.
The chromaticity is adjusted by controlling the amount of current flowing from the light emitting element group 12 to the light emitting element group 12.
【００３９】このように本発明の第３の実施の形態で
は、各ユニット１０で使用される発光素子群１２（発光
素子１１ａ〜１１ｃ）の特性が本発明の第１の実施の形
態で説明した図４に示すように輝度ランクＡ〜Ｃによっ
て異なるため、最初に各ユニット１０を同じ輝度・色度
に調整しているとユニット１０毎に消費電力が異なって
輝度劣化に差が生じて、そのユニット１０毎に輝度・色
度のバラツキが現れるが、各ユニット１０の劣化の度合
いを考慮してその発光素子群１２への電流量を制御する
ことにより、各ユニット１０の色度のバラツキを自動的
に調整することができる。したがって、複数のユニット
１０を縦横に並設した映像表示板でも色度をより高い精
度で調整することができ、色ムラのない均一な画質で映
像等を表示することができる。As described above, in the third embodiment of the present invention, the characteristics of the light emitting element group 12 (light emitting elements 11a to 11c) used in each unit 10 are described in the first embodiment of the present invention. As shown in FIG. 4, since the brightness ranks A to C are different, if each unit 10 is adjusted to the same brightness and chromaticity first, the power consumption will be different for each unit 10 and a difference in brightness deterioration will occur. Although variations in brightness and chromaticity appear in each unit 10, the chromaticity variations in each unit 10 are automatically controlled by controlling the amount of current to the light emitting element group 12 in consideration of the degree of deterioration of each unit 10. Can be adjusted as desired. Therefore, the chromaticity can be adjusted with higher accuracy even with an image display plate in which a plurality of units 10 are arranged vertically and horizontally, and an image or the like can be displayed with uniform image quality without color unevenness.
【００４０】また、本発明の第３の実施の形態の他の態
様としては、図１１に示すように、各ユニット１０の輝
度劣化比率Ｘ％（ＸＲ％、ＸＧ％、ＸＢ％）の最低値Ｘ
ｍｉｎ％に他のユニット１０の輝度劣化比率を合せるよ
うに補正係数を求めて各ユニット１０の係数記憶手段１
３に格納して、発光制御手段１４から発光素子群１２へ
流れる電流の量を制御し輝度の調整を行う構成を採用す
ることにより、ユニット１０毎の輝度のバラツキをより
高精度に調整することができる。As another aspect of the third embodiment of the present invention, as shown in FIG. 11, the minimum value of the luminance deterioration ratio X% (XR%, XG%, XB%) of each unit 10 is set. X
A correction coefficient is calculated so that the luminance deterioration ratio of another unit 10 is matched to min%, and the coefficient storage means 1 of each unit 10
3 to adjust the brightness by controlling the amount of current flowing from the light emission control unit 14 to the light emitting element group 12 to adjust the brightness variation of each unit 10 with higher accuracy. You can
【００４１】（第４の実施の形態）次に、図１２は、本
発明の第４の実施の形態に係る表示装置における制御の
説明図である。図１２において、表示装置は、制御部２
０の設定記憶手段２３内に輝度値テーブルと色温度テー
ブルを格納しておき、表示信号制御手段２４はその設定
記憶手段２３に格納された輝度値テーブルと色温度テー
ブルを用いて映像信号Ｓの演算を実行した後に、ユニッ
ト１０にその信号Ｓを伝送するようになっており、輝度
値テーブルによって画面の明るさを、色温度テーブルに
よって各色の輝度のバランスを調整することによって画
面の色度を調整することができるようになっている。(Fourth Embodiment) Next, FIG. 12 is an explanatory diagram of control in a display device according to a fourth embodiment of the present invention. In FIG. 12, the display device includes a control unit 2
A brightness value table and a color temperature table are stored in the setting storage means 23 of 0, and the display signal control means 24 uses the brightness value table and the color temperature table stored in the setting storage means 23 to display the video signal S. After performing the calculation, the signal S is transmitted to the unit 10, and the brightness of the screen is adjusted by the brightness value table and the chromaticity of the screen is adjusted by adjusting the brightness balance of each color by the color temperature table. It can be adjusted.
【００４２】すなわち、本発明の第４の実施の形態で
は、本発明の第１から第３の各実施の形態のようにユニ
ット１０の係数記憶手段１３内に格納した補正係数を書
き換える方法とは別に、この制御部２０の設定記憶手段
２３に格納された輝度値テーブルおよび色温度テーブル
を書き換えることによって輝度および色度の調整を行う
ことができるようになっている。That is, in the fourth embodiment of the present invention, what is the method of rewriting the correction coefficient stored in the coefficient storage means 13 of the unit 10 as in the first to third embodiments of the present invention? Separately, the brightness and chromaticity can be adjusted by rewriting the brightness value table and the color temperature table stored in the setting storage means 23 of the control unit 20.
【００４３】このように本発明の第４の実施の形態で
も、発光素子群１２の輝度劣化により色度が変化してし
まっても、発光素子１１ａ〜１１ｃそれぞれの輝度比率
を変えて色度を調整することができ、発光素子１１ａ〜
１１ｃの輝度劣化によって変化した色度を自動的に調整
することができる。したがって、劣化を実測する測定を
行うことなく、一定の色度で映像等を表示することがで
きるように自動調整することができる。As described above, also in the fourth embodiment of the present invention, even if the chromaticity changes due to the luminance deterioration of the light emitting element group 12, the chromaticity is changed by changing the luminance ratio of each of the light emitting elements 11a to 11c. Can be adjusted, and the light emitting element 11a ~
It is possible to automatically adjust the chromaticity that has changed due to the deterioration of the luminance of 11c. Therefore, it is possible to automatically adjust so that an image or the like can be displayed with a constant chromaticity without performing measurement for actually measuring deterioration.
【００４４】（第５の実施の形態）次に、図１４は、本
発明の第５の実施の形態に係る表示装置における輝度等
の制御の説明図である。図１４において、映像表示板に
は、映像表示板の周囲温度を測定する周囲温度計測手段
２６が設けられており、周囲温度計測手段２６は、ユニ
ット１０に接続される制御部２０と計測情報のやり取り
が可能なように接続されている。発光素子群１２（発光
素子１１ａ〜１１ｃ）は温度によっても輝度が変化する
ため、図１５に示すような温度対輝度特性を設定記憶手
段２３内に記憶しておき、周囲温度計測手段２６による
計測情報に基づいて輝度変化率Ｘ％を算出し、算出した
輝度変化率Ｘ％に基づいて補正係数を求め、その補正係
数に基づいて発光素子群１２の電流量を制御すること
で、周囲温度によって変化した輝度を調整することがで
きるようになっている。(Fifth Embodiment) Next, FIG. 14 is an explanatory diagram of control of brightness and the like in a display device according to a fifth embodiment of the present invention. In FIG. 14, the image display plate is provided with an ambient temperature measuring means 26 for measuring the ambient temperature of the image display plate, and the ambient temperature measuring means 26 is provided with a control unit 20 connected to the unit 10 and measurement information. Connected so that they can communicate. Since the brightness of the light emitting element group 12 (light emitting elements 11a to 11c) changes with temperature, temperature-brightness characteristics as shown in FIG. 15 are stored in the setting storage means 23 and measured by the ambient temperature measuring means 26. The brightness change rate X% is calculated based on the information, the correction coefficient is obtained based on the calculated brightness change rate X%, and the current amount of the light emitting element group 12 is controlled based on the correction coefficient, thereby changing the ambient temperature The changed brightness can be adjusted.
【００４５】また、図１６に示すように赤色、緑色、青
色の３種類の発光素子の温度対輝度特性が異なった場
合、各素子の輝度劣化比率（ＸＲ％、ＸＧ％、ＸＢ％）
を算出する。表示信号制御手段２４は、ここで求めた輝
度劣化比率の値から、上記のようにＸＲ％、ＸＧ％、Ｘ
Ｂ％の値をそろえるための電流の補正係数を求めてユニ
ット１０の係数記憶手段１３に記憶させ、その補正係数
を用いて発光制御手段１４から発光素子群１２へ流れる
電流値を制御することによって発光素子１１ａ〜１１ｃ
の温度特性の違いによって変化した色度を調整する。Further, as shown in FIG. 16, when the temperature-luminance characteristics of the three types of light emitting elements of red, green and blue are different, the luminance deterioration ratio of each element (XR%, XG%, XB%).
To calculate. The display signal control means 24 determines XR%, XG%, X as described above from the value of the luminance deterioration ratio obtained here.
By obtaining a current correction coefficient for aligning the B% values and storing it in the coefficient storage means 13 of the unit 10, and controlling the current value flowing from the light emission control means 14 to the light emitting element group 12 using the correction coefficient. Light emitting elements 11a to 11c
Adjust the chromaticity changed due to the difference in temperature characteristics of.
【００４６】このように本発明の第５の実施の形態で
は、周囲温度の変化により輝度や色度が変化してしまっ
ても、温度情報と３種類の発光素子それぞれの温度対輝
度特性に基づいてそれぞれの輝度変化比率が等しくなる
ように補正係数を調整することができ、周囲温度の変化
による色度の変化を調整することができる。したがっ
て、温度環境が変化しても、輝度や色度の測定を行わず
に一定の画質の映像等を表示することができる表示装置
を提供することができる。As described above, according to the fifth embodiment of the present invention, even if the brightness and chromaticity are changed due to the change of the ambient temperature, it is based on the temperature information and the temperature-luminance characteristics of each of the three types of light emitting elements. Therefore, the correction coefficient can be adjusted so that the respective brightness change ratios are equal, and the change in chromaticity due to the change in ambient temperature can be adjusted. Therefore, it is possible to provide a display device capable of displaying an image or the like having a constant image quality without measuring the luminance and chromaticity even if the temperature environment changes.
【００４７】（第６の実施の形態）次に、図１７は、本
発明の第６の実施の形態に係る表示装置における輝度等
の制御の説明図である。図１７において、表示装置は、
制御部２０と、制御部２０に接続された複数のユニット
１０が縦横に並設された映像表示板とを含むように構成
されている。ここで、各ユニット１０には、発光素子群
１２の周囲温度を計測する温度計測手段１５が設けられ
ている。表示信号制御手段２４は、各ユニット１０の周
囲温度の計測情報を取り込んで、各ユニット１０の温度
による輝度変化比率を算出し、算出された輝度変化比率
に応じたユニット１０毎の補正係数を求めてそれぞれの
係数記憶手段１３に記憶させるようになっている。そし
て、係数記憶手段１３に記憶された補正係数に基づい
て、ユニット１０毎に、発光制御手段１４から発光素子
群１２に流れる電流の量を制御して色度の調整を行うよ
うになっている。(Sixth Embodiment) FIG. 17 is an explanatory diagram of control of brightness and the like in a display device according to a sixth embodiment of the present invention. In FIG. 17, the display device is
The control unit 20 and a plurality of units 10 connected to the control unit 20 are configured to include an image display plate that is vertically and horizontally arranged side by side. Here, each unit 10 is provided with temperature measuring means 15 for measuring the ambient temperature of the light emitting element group 12. The display signal control means 24 takes in the measurement information of the ambient temperature of each unit 10, calculates the luminance change ratio due to the temperature of each unit 10, and obtains the correction coefficient for each unit 10 according to the calculated luminance change ratio. Are stored in the respective coefficient storage means 13. Then, based on the correction coefficient stored in the coefficient storage means 13, the amount of current flowing from the light emission control means 14 to the light emitting element group 12 is controlled for each unit 10 to adjust the chromaticity. .
【００４８】また、本発明の第５の実施の形態と同様
に、発光素子１１ａ〜１１ｃが発する色の種類によって
温度対輝度特性が異なる場合、各色の発光素子の輝度劣
化比率を算出し、算出した輝度劣化比率に応じた補正係
数を求めて係数記憶手段１３に記憶させると共に、係数
記憶手段１３に記憶された補正係数に基づいて、色毎
に、かつユニット１０毎に、発光制御手段１４から発光
素子群１２に流れる電流の量を制御して色度の調整を行
うのでも良い。Further, as in the fifth embodiment of the present invention, when the temperature-luminance characteristics differ depending on the type of color emitted by the light emitting elements 11a to 11c, the luminance deterioration ratio of the light emitting elements of each color is calculated and calculated. The correction coefficient corresponding to the luminance deterioration ratio is obtained and stored in the coefficient storage means 13, and based on the correction coefficient stored in the coefficient storage means 13, from the light emission control means 14 for each color and for each unit 10. The chromaticity may be adjusted by controlling the amount of current flowing through the light emitting element group 12.
【００４９】このように本発明の第６の実施の形態で
は、想定温度との温度差によって輝度の差が生じた場合
や輝度または色度の差が出た場合でも、輝度や色度を測
定することなく、ユニット毎に輝度や色度を調整して一
定に保持することができる。As described above, in the sixth embodiment of the present invention, the luminance and the chromaticity are measured even when the difference in the luminance is caused by the temperature difference from the assumed temperature or the difference in the luminance or the chromaticity is produced. Without this, the brightness and chromaticity can be adjusted for each unit and kept constant.
【００５０】（第７の実施の形態）次に、図１８および
図１９は、本発明の第７の実施の形態に係る表示装置に
ついての説明図である。本発明の第７の実施の形態に係
る表示装置を構成する制御部２０の設定記憶手段２３
は、色温度を設定する設定係数を記憶しておくようにな
っている。具体的には、色温度の設定に用いられる設定
係数を例えば図１８に示すように、想定した特定の輝度
について色温度毎に記憶しておくのでも良い。また、図
１９に示すように、輝度毎かつ色温度毎に、設定係数を
記憶しておくのでも良い。図１９は、１６段階の輝度毎
かつ色温度毎に設定係数を記憶しておく場合の例を示す
図である。(Seventh Embodiment) Next, FIGS. 18 and 19 are explanatory views of a display device according to a seventh embodiment of the present invention. The setting storage unit 23 of the control unit 20 that constitutes the display device according to the seventh embodiment of the present invention.
Stores the setting coefficient for setting the color temperature. Specifically, the setting coefficient used for setting the color temperature may be stored for each color temperature with respect to the assumed specific brightness as shown in FIG. 18, for example. Further, as shown in FIG. 19, the setting coefficient may be stored for each luminance and each color temperature. FIG. 19 is a diagram showing an example in which setting coefficients are stored for each of 16 levels of brightness and color temperature.
【００５１】表示信号制御手段２４は、指定された輝度
値に対応する色温度についての予め決められた情報と、
上記の設定記憶手段２３に記憶された設定係数とに基づ
いて各発光素子の色度を指定された輝度毎に制御し、輝
度に応じた色温度が実現されるように動作する。The display signal control means 24 has predetermined information about the color temperature corresponding to the designated brightness value,
The chromaticity of each light emitting element is controlled for each designated brightness based on the setting coefficient stored in the setting storage means 23, and the color temperature corresponding to the brightness is realized.
【００５２】このように本発明の第７の実施の形態で
は、それぞれの輝度段階で色温度を調整することがで
き、輝度の違いによる温度差に影響されずに一定の色度
で映像等を表示することができる表示装置を提供するこ
とができる。したがって、輝度設定値を変えたことによ
って映像表示板の温度が変化しても、輝度設定値毎に異
なる色温度の設定係数を設けることによりこの温度変化
による影響を受けずに一定の色温度で映像等を表示する
ことができる。As described above, in the seventh embodiment of the present invention, the color temperature can be adjusted in each luminance step, and an image or the like can be displayed with a constant chromaticity without being affected by the temperature difference due to the difference in luminance. A display device capable of displaying can be provided. Therefore, even if the temperature of the image display plate changes due to the change of the brightness setting value, by setting a different color temperature setting coefficient for each brightness setting value, it is possible to maintain a constant color temperature without being affected by this temperature change. Images, etc. can be displayed.
【００５３】[0053]
【発明の効果】以上説明したように、本発明によれば、
発光素子の輝度劣化により色度が変化してしまっても、
複数の発光素子の運用時間からそれぞれの輝度劣化比率
を求めて、各素子の輝度劣化比率が等しくなるように調
整することができるので、発光素子の輝度劣化によって
変化した色度を自動的に調整することができる。したが
って、発光素子の劣化の程度の測定を行わなくても一定
の画質で映像等を表示することができるという、優れた
効果を有する表示装置を提供することができる。As described above, according to the present invention,
Even if the chromaticity changes due to the deterioration of the brightness of the light emitting element,
It is possible to obtain the luminance deterioration ratio from the operating time of multiple light emitting elements and adjust so that the luminance deterioration ratio of each element becomes equal, so the chromaticity changed due to the luminance deterioration of the light emitting element is automatically adjusted. can do. Therefore, it is possible to provide a display device having an excellent effect that an image or the like can be displayed with a constant image quality without measuring the degree of deterioration of the light emitting element.
【図１】本発明の第１の実施の形態に係る表示装置の概
略全体構成を示すブロック図FIG. 1 is a block diagram showing a schematic overall configuration of a display device according to a first embodiment of the present invention.
【図２】本発明の第１の実施の形態に係る表示装置を構
成する発光素子群の構成を模式的に示す平面図FIG. 2 is a plan view schematically showing the configuration of a light emitting element group constituting the display device according to the first embodiment of the invention.
【図３】本発明の発光素子の一特性を示すグラフFIG. 3 is a graph showing one characteristic of the light emitting device of the present invention.
【図４】本発明の発光素子の一特性を示すグラフFIG. 4 is a graph showing one characteristic of the light emitting device of the present invention.
【図５】本発明の第１の実施の形態に係る表示装置にお
ける制御の説明図FIG. 5 is an explanatory diagram of control in the display device according to the first embodiment of the present invention.
【図６】本発明の発光素子の一特性を示すグラフFIG. 6 is a graph showing one characteristic of the light emitting device of the present invention.
【図７】本発明の第１の実施の形態に係る表示装置にお
ける制御の説明図FIG. 7 is an explanatory diagram of control in the display device according to the first embodiment of the present invention.
【図８】本発明の第２の実施の形態に係る表示装置の概
略全体構成を示すブロック図FIG. 8 is a block diagram showing a schematic overall configuration of a display device according to a second embodiment of the present invention.
【図９】本発明の発光素子の一特性を示すグラフFIG. 9 is a graph showing one characteristic of the light emitting device of the present invention.
【図１０】本発明の第３の実施の形態に係る表示装置の
概略全体構成を示すブロック図FIG. 10 is a block diagram showing a schematic overall configuration of a display device according to a third embodiment of the present invention.
【図１１】本発明の第３の実施の形態に係る表示装置に
おける制御の説明図FIG. 11 is an explanatory diagram of control in the display device according to the third embodiment of the present invention.
【図１２】本発明の第４の実施の形態に係る表示装置に
おける制御の説明図FIG. 12 is an explanatory diagram of control in the display device according to the fourth embodiment of the present invention.
【図１３】従来技術を示すブロック図FIG. 13 is a block diagram showing a conventional technique.
【図１４】本発明の第５の実施の形態に係る表示装置の
概略全体構成を示すブロック図FIG. 14 is a block diagram showing a schematic overall configuration of a display device according to a fifth embodiment of the present invention.
【図１５】本発明の発光素子の一特性を示すグラフFIG. 15 is a graph showing one characteristic of the light emitting device of the present invention.
【図１６】本発明の発光素子の一特性を示すグラフFIG. 16 is a graph showing one characteristic of the light emitting device of the present invention.
【図１７】本発明の第６の実施の形態に係る表示装置の
概略全体構成を示すブロック図FIG. 17 is a block diagram showing a schematic overall configuration of a display device according to a sixth embodiment of the present invention.
【図１８】本発明の第７の実施の形態に係る色温度の設
定係数を保持する一例を示す図FIG. 18 is a diagram showing an example of holding a color temperature setting coefficient according to a seventh embodiment of the present invention.
【図１９】本発明の第７の実施の形態に係る輝度毎に色
温度の設定係数を保持する一例を示す図FIG. 19 is a diagram showing an example of holding a color temperature setting coefficient for each luminance according to a seventh embodiment of the present invention.
１０ ユニット １１ａ〜１１ｃ 発光素子 １２ 発光素子群 １３ 係数記憶手段 １４ 発光制御手段 ２０ 制御部 ２１ ＣＰＵ ２２ 運用時間記憶手段 ２３ 設定記憶手段 ２４ 表示信号制御手段 ２５ 電力計測手段 ２６ 周囲温度計測手段 １０１ ＣＲＴ １０２ 検出手段 １０３ テーブル選択手段 １０４ 記憶手段 １０５ 諧調補正手段 Ｓ 映像信号 10 units 11a to 11c Light emitting device 12 Light emitting element group 13 coefficient storage means 14 Light emission control means 20 Control unit 21 CPU 22 Operating time storage means 23 setting storage means 24 Display signal control means 25 Electric power measuring means 26 Ambient temperature measuring means 101 CRT 102 detection means 103 table selection means 104 storage means 105 Gradation correction means S video signal
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｇ０９Ｇ 3/20 ６４２ Ｇ０９Ｇ 3/20 ６４２Ｂ ６４２Ｃ ６４２Ｌ ６４２Ｐ ６５０ ６５０Ｍ ６７０ ６７０Ｊ ６８０ ６８０Ｅ (72)発明者 八重樫 寛朋 神奈川県横浜市港北区綱島東四丁目３番１ 号 松下通信工業株式会社内 (72)発明者 佐藤 晋也 神奈川県横浜市港北区綱島東四丁目３番１ 号 松下通信工業株式会社内 (72)発明者 岡崎 紀彦 神奈川県横浜市港北区綱島東四丁目３番１ 号 松下通信工業株式会社内 Ｆターム(参考） 5C080 AA07 BB06 CC03 DD04 DD05 DD14 DD20 DD29 EE29 EE30 FF09 GG02 GG15 GG17 HH14 JJ02 JJ03 JJ05 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 7 Identification code FI Theme Coat (reference) G09G 3/20 642 G09G 3/20 642B 642C 642L 642P 650 650M 670 670J 680 680E (72) Inventor Yasashi Kanagawa Hironaga Matsushita Communication Industrial Co., Ltd., 3-1, Tsunashima Higashi 4-chome, Kohoku Ward, Yokohama City, Japan (72) Inventor Shinya Sato, 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama City, Kanagawa Prefecture Matsushita Communication Industry Co., Ltd. (72) Invention Norihiko Okazaki 4-3-1, Tsunashima-higashi, Kohoku-ku, Yokohama-shi, Kanagawa Matsushita Communication Industrial Co., Ltd. F-term (reference) 5C080 AA07 BB06 CC03 DD04 DD05 DD14 DD20 DD29 EE29 EE30 FF09 GG02 GG15 GG17 HH14 JJ02 JJ03 JJ05
Claims (10)
群と、前記発光素子群により表示される映像を調整する
ための係数を記憶する係数記憶手段と、前記発光素子群
に映像を表示するための表示データおよび前記係数記憶
手段に記憶された係数に基づいて前記発光素子群を発光
させる発光制御手段と、運用を開始してからの運用時間
を記憶する運用時間記憶手段と、前記発光素子群の発光
を制御するための設定値を記憶する設定記憶手段と、前
記設定記憶手段に記憶された設定値および前記表示デー
タに基づいて前記発光素子の発光を制御する表示信号制
御手段とを備えて、 前記発光制御手段は前記運用時間記憶手段に記憶された
運用時間を用いて前記複数の発光素子の発光を制御する
ことを特徴とする表示装置。1. A light emitting element group composed of an array of a plurality of light emitting elements, a coefficient storing means for storing a coefficient for adjusting an image displayed by the light emitting element group, and an image displayed on the light emitting element group. Light emission control means for causing the light emitting element group to emit light based on the display data for storing and the coefficient stored in the coefficient storage means, operation time storage means for storing the operation time after the start of operation, and the light emitting element A setting storage unit that stores a set value for controlling the light emission of the group, and a display signal control unit that controls the light emission of the light emitting element based on the set value and the display data stored in the setting storage unit. The light emission control unit controls the light emission of the plurality of light emitting elements by using the operation time stored in the operation time storage unit.
手段を用いて前記発光素子毎の輝度劣化比率を算出し、
前記複数の発光素子の輝度劣化比率を等しくする補正係
数で前記複数の発光素子の発光を制御することを特徴と
する請求項１に記載の表示装置。2. The light emission control means calculates a luminance deterioration ratio for each light emitting element using the operating time storage means,
The display device according to claim 1, wherein the light emission of the plurality of light emitting elements is controlled by a correction coefficient that equalizes the luminance deterioration ratios of the plurality of light emitting elements.
前記発光素子の電流対輝度特性を格納する前記係数記憶
手段を配設された複数のユニットによって構築された映
像表示板を備えて、前記各ユニットの前記係数記憶手段
に格納された前記発光素子の電流対輝度特性と前記電力
計測手段により取得した前記平均電力情報とを用いて前
記各ユニット毎に消費電力を算出し、その算出結果と前
記運用時間記憶手段より取得した運用時間情報を用いて
前記各ユニットそれぞれの前記補正係数を求めて前記係
数記憶手段に格納し、その補正係数を用いて電流値を制
御し、前記ユニット毎に色度を調整することを特徴とす
る請求項２に記載の表示装置。3. An image display plate constructed by a plurality of units in which the light emitting element groups are arranged vertically and horizontally and the coefficient storage means for storing the current-luminance characteristic of the light emitting elements is provided. Power consumption is calculated for each unit using the current-to-luminance characteristics of the light-emitting element stored in the coefficient storage unit of each unit and the average power information acquired by the power measurement unit, and the calculation result is obtained. Using the operating time information acquired from the operating time storage means, the correction coefficient of each of the units is obtained and stored in the coefficient storage means, and the current value is controlled using the correction coefficient, and each unit is controlled. The display device according to claim 2, wherein chromaticity is adjusted.
比率の最低のものに他の全ての前記ユニットの輝度劣化
比率を合せるように前記各ユニットの前記補正係数を求
めて前記ユニット毎の前記係数記憶手段に格納し、その
補正係数を用いて電流値を加減し、前記ユニット毎に輝
度を調整することを特徴とする請求項３に記載の表示装
置。4. The correction coefficient of each unit is calculated so that the lowest luminance deterioration ratio calculated for each unit is matched with the luminance deterioration ratio of all other units, and the coefficient for each unit is calculated. The display device according to claim 3, wherein the display device is stored in a storage unit, and a current value is adjusted by using the correction coefficient to adjust the brightness for each unit.
群と、前記発光素子群に流れる電流の量を加減するため
の係数を格納する係数記憶手段と、前記発光素子群に映
像等を表示するための表示データと前記係数記憶手段に
格納された前記係数に基づいて前記発光素子群を発光さ
せる発光制御手段と、運用を開始してから調整タイミン
グまでの運用時間を記録する運用時間記憶手段と、前記
発光素子群の発光を制御するための設定値を格納する設
定記憶手段と、前記設定記憶手段に格納された前記設定
値および前記表示データに基づいて前記発光素子群の発
光を制御する表示信号制御手段とを備えて、前記発光素
子群の各色の輝度の比率を変えて色度を調整するための
前記設定記憶手段に格納された設定値を変更することに
より、前記発光素子の電流値を制御し、前記発光素子の
輝度、色度を調整することを特徴とする表示装置。5. A light emitting element group including an array of a plurality of light emitting elements, a coefficient storage unit for storing a coefficient for adjusting the amount of current flowing through the light emitting element group, and an image or the like displayed on the light emitting element group. Light emission control means for causing the light emitting element group to emit light based on the display data and the coefficient stored in the coefficient storage means, and operation time storage means for recording the operation time from the start of operation to the adjustment timing. And setting storage means for storing a set value for controlling the light emission of the light emitting element group, and controlling the light emission of the light emitting element group based on the set value and the display data stored in the setting storage means. A light emitting element by changing the set value stored in the setting storage means for adjusting the chromaticity by changing the ratio of the brightness of each color of the light emitting element group. A display device, characterized in that the luminance and chromaticity of the light emitting element are adjusted by controlling the current value of the.
群と、前記発光素子群に流す電流の量を記憶する係数記
憶手段と、前記発光素子群の周囲温度を計測する温度計
測手段と、前記発光素子群の発光を制御するための設定
値および前記発光素子の温度対輝度特性を格納する設定
記憶手段と、前記温度計測手段より取得した前記周囲温
度の情報と前記設定記憶手段に記憶された前記温度対輝
度特性とに基づいて各前記発光素子の輝度の変化率を算
出し、算出された各前記発光素子の輝度の変化率に応じ
た補正係数を求めて前記係数記憶手段に記憶させると共
に、前記設定記憶手段に格納された前記設定値および前
記表示データ並びに前記係数記憶手段に記憶させた補正
係数に基づいて前記発光素子群の発光を制御する表示信
号制御手段とを備えて、 前記表示信号制御手段は、前記補正係数に基づいて前記
発光素子の電流値を加減し、前記発光素子の輝度を前記
周囲温度に応じて制御することを特徴とする表示装置。6. A light emitting element group composed of an array of a plurality of light emitting elements, a coefficient storing means for storing the amount of current flowing through the light emitting element group, and a temperature measuring means for measuring an ambient temperature of the light emitting element group. Setting storage means for storing a set value for controlling light emission of the light emitting element group and temperature-luminance characteristics of the light emitting element, information on the ambient temperature acquired from the temperature measuring means, and the setting storage means. The rate of change in luminance of each light emitting element is calculated based on the temperature-luminance characteristic, and a correction coefficient corresponding to the calculated rate of change in luminance of each light emitting element is calculated and stored in the coefficient storage means. And a display signal control means for controlling light emission of the light emitting element group based on the set value and the display data stored in the setting storage means and the correction coefficient stored in the coefficient storage means. The display signal control means adjusts the current value of the light emitting element based on the correction coefficient, and controls the brightness of the light emitting element according to the ambient temperature.
の発光素子、および青色の発光素子を含み、前記設定記
憶手段は、各前記色の発光素子の温度対輝度特性を格納
し、前記表示信号制御手段は、前記周囲温度の情報と各
前記温度対輝度特性とに基づいて各前記色の発光素子の
輝度の変化率を算出し、算出された各前記色の発光素子
の輝度の変化率に応じた色別補正係数を求めて前記係数
記憶手段に記憶させると共に、前記色別補正係数に基づ
いて各前記色の発光素子それぞれの電流値を加減し、各
前記発光素子の色温度を制御することを特徴とする請求
項６に記載の表示装置。7. The light emitting element includes a red light emitting element, a green light emitting element, and a blue light emitting element, and the setting storage means stores temperature-luminance characteristics of the light emitting element of each color, The display signal control means calculates the rate of change of the luminance of the light emitting element of each color based on the information of the ambient temperature and the temperature-brightness characteristic, and the change of the luminance of the light emitting element of each calculated color. A color-dependent correction coefficient corresponding to the ratio is obtained and stored in the coefficient storage means, and the current value of each light-emitting element of each color is adjusted based on the color-dependent correction coefficient to determine the color temperature of each light-emitting element. The display device according to claim 6, which is controlled.
に前記係数記憶手段が配設された複数のユニットによっ
て構築された映像表示板と、前記ユニット毎に前記発光
素子群の周囲温度を計測する温度計測手段とを備えて、
前記周囲温度の情報と前記温度対輝度特性とに基づいて
各前記発光素子の輝度の変化率を算出し、算出された各
前記発光素子の輝度の変化率に応じた補正係数を求めて
前記係数記憶手段に記憶させると共に、前記補正係数に
基づいて前記発光素子の電流値を加減し、前記ユニット
毎に前記発光素子の輝度を制御することを特徴とする請
求項６に記載の表示装置。8. An image display plate constructed by a plurality of units in which the light emitting element groups are arranged vertically and horizontally and the coefficient storing means is arranged, and an ambient temperature of the light emitting element groups for each unit. With a temperature measuring means for measuring,
The coefficient of change of the luminance of each of the light emitting elements is calculated based on the information of the ambient temperature and the temperature-brightness characteristic, and the coefficient is obtained by obtaining a correction coefficient according to the calculated rate of change of the brightness of each of the light emitting elements. The display device according to claim 6, wherein the display device is stored in a storage unit, and the current value of the light emitting element is adjusted based on the correction coefficient to control the brightness of the light emitting element for each unit.
に前記係数記憶手段が配設された複数のユニットによっ
て構築された映像表示板と、前記ユニット毎に前記発光
素子群の周囲温度を計測する温度計測手段とを備えて、
前記発光素子は、赤色の発光素子、緑色の発光素子、お
よび青色の発光素子を含み、前記設定記憶手段は、各前
記色の発光素子の温度対輝度特性を格納し、前記表示信
号制御手段は、前記ユニット毎に、前記周囲温度の情報
と各前記温度対輝度特性とに基づいて各前記色の発光素
子の輝度の変化率を算出し、算出された各前記色の発光
素子の輝度の変化率に応じた色別補正係数を求めて該当
するユニットの係数記憶手段に記憶させると共に、前記
ユニット毎の前記色別補正係数に基づいて各前記色の発
光素子それぞれの電流値を加減し、各前記発光素子の色
温度を制御することを特徴とする請求項７に記載の表示
装置。9. An image display plate constructed by a plurality of units in which the light emitting element groups are arranged vertically and horizontally and the coefficient storing means is arranged, and an ambient temperature of the light emitting element groups for each unit. With a temperature measuring means for measuring,
The light emitting element includes a red light emitting element, a green light emitting element, and a blue light emitting element, the setting storage means stores the temperature-luminance characteristic of the light emitting element of each color, the display signal control means is For each of the units, the change rate of the luminance of the light emitting element of each color is calculated based on the ambient temperature information and the temperature-luminance characteristic, and the calculated change of the luminance of the light emitting element of each color. A color-dependent correction coefficient corresponding to the rate is obtained and stored in the coefficient storage means of the corresponding unit, and the current value of each light-emitting element of each color is adjusted based on the color-based correction coefficient of each unit, The display device according to claim 7, wherein the color temperature of the light emitting element is controlled.
値毎に色温度を設定するための設定係数を記憶し、前記
表示信号制御手段は、指定された輝度値に対応する色温
度の予め決められた情報に基づいて各前記発光素子の色
度を指定された輝度毎に制御することを特徴とする請求
項１ないし請求項９のいずれかに記載の表示装置。10. The setting storage means further stores a setting coefficient for setting a color temperature for each brightness setting value, and the display signal control means predetermines a color temperature corresponding to the specified brightness value. 10. The display device according to claim 1, wherein the chromaticity of each of the light emitting elements is controlled for each designated luminance based on the obtained information.
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|---|---|---|---|
| JP2001-334197 | 2001-10-31 | ||
| JP2001334197 | 2001-10-31 | ||
| JP2002307386A JP2003202838A (en) | 2001-10-31 | 2002-10-22 | Display device |
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|---|---|
| JP2003202838A true JP2003202838A (en) | 2003-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
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