JP2016050982A - Luminance correction device and system including the same, and luminance correction method - Google Patents

Luminance correction device and system including the same, and luminance correction method Download PDF

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JP2016050982A
JP2016050982A JP2014174974A JP2014174974A JP2016050982A JP 2016050982 A JP2016050982 A JP 2016050982A JP 2014174974 A JP2014174974 A JP 2014174974A JP 2014174974 A JP2014174974 A JP 2014174974A JP 2016050982 A JP2016050982 A JP 2016050982A
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俊介 市澤
Shunsuke Ichizawa
俊介 市澤
弘希 吉永
Hiroki Yoshinaga
弘希 吉永
義貴 中宮
yoshitaka Nakamiya
義貴 中宮
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Cybernet Systems Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a luminance correction method of an organic EL display that does not require a measurement time even when a correction of luminance unevenness for each pixel is made.SOLUTION: The present invention sequentially has: a shooting procedure of displaying a color of one sub-pixel constituting of a pixel of a display 100 on the display device 100 in a pattern in such a way that the color thereof is a common gradation in each pixel and each pixel can be separated, photographing, by a camera 10, an entire pattern displayed on the display 100 at a time, and sequentially implementing the photographing as to each sub-pixel and a plurality of gradations; a characteristic calculation procedure of calculating, by a processing unit 21, a luminance characteristic relative to the gradation of respective sub-pixels; and a correction procedure of correcting, by a control unit 23, luminance characteristic of each pixel on the basis of the luminance characteristic obtained by the characteristic calculation procedure relative to the display 100.SELECTED DRAWING: Figure 1

Description

本発明は、ディスプレイの輝度補正方法に関する。   The present invention relates to a display luminance correction method.

ＬＣＤやＬＥＤディスプレイの輝度ムラを補正するために、カメラで測定した輝度から補正係数を計算し、それに基づいて輝度ムラを補正することが行われている。   In order to correct the brightness unevenness of the LCD or LED display, a correction coefficient is calculated from the brightness measured by the camera, and the brightness unevenness is corrected based on the correction coefficient.

有機ＥＬディスプレイは、画素ごとのばらつきがあるため、ＬＣＤの補正のように輝度が空間的になだらかに変化する補正方法は使用できない。また、ＬＣＤの補正技術を転用したものでは画素毎の補正はできず、ディスプレイの高精細化に対応できない。また、ＬＥＤディスプレイは画素毎の輝度バラつきがあるが、階調対輝度の特性は単純な式で表すことができるのに対して、ＯＬＥＤでは画素毎にその特性が異なる。   Since the organic EL display has a pixel-to-pixel variation, a correction method in which the luminance gently changes spatially, such as LCD correction, cannot be used. In addition, the LCD correction technique cannot be used for pixel-by-pixel correction and can not cope with high-definition display. Further, although the LED display has a luminance variation for each pixel, the characteristic of gradation versus luminance can be expressed by a simple expression, whereas the characteristic of an OLED is different for each pixel.

そこで、有機ＥＬディスプレイについては、ディスプレイの一部を拡大撮影し、カメラを移動しながら画素ごとの輝度を測定するシステムが提案されている（例えば、特許文献１参照）。しかし、特許文献１に開示されている技術は、カメラを移動するため、測定に時間がかかる問題がある。また、カメラとディスプレイのアライメントにも時間がかかる問題がある。階調対輝度の特性を得るために測定階調数を増やすと、さらに時間がかかる問題がある。撮影画像にモアレが生じるのでソフトウェア的に処理をするが、同じような周波数成分の輝度ムラがあった場合に、測定値に影響が出る問題がある。   Thus, for an organic EL display, a system has been proposed in which a part of the display is magnified and the luminance of each pixel is measured while moving the camera (see, for example, Patent Document 1). However, the technique disclosed in Patent Document 1 has a problem that it takes time to measure because the camera is moved. In addition, there is a problem that it takes time to align the camera and the display. If the number of measured gradations is increased in order to obtain the characteristics of gradation versus luminance, there is a problem that it takes more time. Since moiré occurs in the photographed image, the processing is performed by software. However, there is a problem that the measurement value is affected when there is a luminance unevenness of the same frequency component.

また、有機ＥＬディスプレイの輝度を補正する方法として、画素に供給される電流をモニタリングし電流の補正を行うシステムも考えられる。しかし、この方法は、専用のチップを基板上に実装するスペースの問題があり、小型パネルには適用できない問題がある。また、電流のモニタリングだけでは実際の輝度を完全に反映することができず、その効果も確認できない問題がある。   Further, as a method of correcting the luminance of the organic EL display, a system that monitors the current supplied to the pixel and corrects the current is also conceivable. However, this method has a problem of space for mounting a dedicated chip on a substrate, and has a problem that it cannot be applied to a small panel. Further, there is a problem that the actual luminance cannot be completely reflected only by current monitoring, and the effect cannot be confirmed.

特開２０１１−１７０１０６号公報JP 2011-170106 A

このように、有機ＥＬディスプレイは、輝度ムラを画素ごとに補正しようとすると、測定時間がかかる問題があった。測定時間がかかったのでは、生産現場では利用できない。   As described above, the organic EL display has a problem that it takes a long time to correct luminance unevenness for each pixel. Since it took a long time, it cannot be used at the production site.

そこで、本発明は、画素ごとに輝度ムラの補正を行っても測定時間がかからない有機ＥＬディスプレイの輝度補正方法の提供を目的とする。   Therefore, an object of the present invention is to provide a method for correcting the luminance of an organic EL display that does not take a measurement time even if luminance unevenness is corrected for each pixel.

具体的には、本発明に係る輝度補正装置は、
ディスプレイの画素を構成する１つのサブ画素の色を、各画素とも共通の階調でありかつ各画素を分離できるようなパターンで前記ディスプレイに表示する表示制御部と、
前記ディスプレイに表示されたパターンの全体を同時に撮像した画像でありかつ、当該撮像を各サブ画素及び複数の階調について順次行った画像を用いて、個々のサブ画素の階調に対する輝度特性を算出する処理部と、
前記ディスプレイに対し、各サブ画素の輝度特性を、前記処理部の求めた輝度特性に基づいて補正する補正制御部と、を備える。 Specifically, the brightness correction apparatus according to the present invention is:
A display control unit that displays the color of one sub-pixel constituting a pixel of the display on the display in a pattern in which each pixel has a common gradation and can separate each pixel;
Using the image obtained by capturing the entire pattern displayed on the display at the same time and sequentially performing the imaging for each subpixel and multiple tones, the luminance characteristics for each subpixel tone are calculated. A processing unit to
A correction control unit configured to correct the luminance characteristic of each sub-pixel based on the luminance characteristic obtained by the processing unit with respect to the display;

本発明に係る輝度補正装置では、前記表示制御部は、格子状に１つ以上の画素をあけて前記ディスプレイに表示することで、各画素を分離できるようなパターンで前記ディスプレイに表示してもよい。   In the luminance correction apparatus according to the present invention, the display control unit may display one or more pixels in a grid pattern on the display so that each pixel can be separated by displaying the pixel on the display. Good.

具体的には、本発明に係る輝度補正システムは、本発明に係る輝度補正装置と、前記ディスプレイに表示されたパターンの全体を同時に撮像した画像でありかつ、当該撮像を各サブ画素及び複数の階調について順次行った画像を撮像するカメラと、を備える。   Specifically, the brightness correction system according to the present invention is an image obtained by simultaneously capturing the brightness correction apparatus according to the present invention and the entire pattern displayed on the display, and the imaging is performed on each sub-pixel and a plurality of sub-pixels. And a camera that captures images sequentially performed with respect to gradation.

具体的には、本発明に係る輝度補正方法は、
ディスプレイの画素を構成する１つのサブ画素の色を、各画素とも共通の階調でありかつ各画素を分離できるようなパターンで前記ディスプレイに表示し、カメラが、前記ディスプレイに表示されたパターンの全体を同時に撮像し、当該撮像を各サブ画素及び複数の階調について順次行う撮像手順と、
処理部が、個々のサブ画素の階調に対する輝度特性を算出する特性算出手順と、
制御部が、前記ディスプレイに対し、各サブ画素の輝度特性を、前記特性算出手順で求めた輝度特性に基づいて補正する補正手順と、
を順に有する。 Specifically, the brightness correction method according to the present invention is:
The color of one sub-pixel constituting the pixel of the display is displayed on the display in a pattern in which each pixel has a common gradation and the pixels can be separated, and the camera has a pattern of the pattern displayed on the display. An imaging procedure for imaging the whole at the same time and sequentially performing the imaging for each sub-pixel and a plurality of gradations;
A characteristic calculation procedure in which the processing unit calculates a luminance characteristic for the gradation of each sub-pixel;
A correction procedure in which the control unit corrects the luminance characteristics of each sub-pixel with respect to the display based on the luminance characteristics obtained in the characteristic calculation procedure;
In order.

本発明によれば、画素ごとに輝度ムラの補正を行っても測定時間がかからない有機ＥＬディスプレイの輝度補正方法を提供することができる。また本発明によれば、画素ごとに輝度ムラの補正を行うことができるため、輝度ムラにより出荷できない有機ＥＬディスプレイが減り、歩留まりを上げることができる。   According to the present invention, it is possible to provide a luminance correction method for an organic EL display that does not take a measurement time even if luminance unevenness is corrected for each pixel. Further, according to the present invention, since uneven brightness can be corrected for each pixel, the number of organic EL displays that cannot be shipped due to uneven brightness is reduced, and the yield can be increased.

本実施形態に係る輝度補正システムの構成例を示す。The structural example of the brightness correction system which concerns on this embodiment is shown. ディスプレイの第１の画素の配列例を示す。The example of an arrangement | sequence of the 1st pixel of a display is shown. ディスプレイの第２の画素の配列例を示す。The example of an arrangement | sequence of the 2nd pixel of a display is shown. １つのサブ画素についての階調に対する輝度特性の一例を示す。An example of the luminance characteristic with respect to the gradation about one subpixel is shown. 輝度特性を表す関数Ｌ（ｇ）の算出例を示す。An example of calculating a function L (g) representing luminance characteristics is shown.

以下、本発明の実施形態について、図面を参照しながら詳細に説明する。なお、本発明は、以下に示す実施形態に限定されるものではない。これらの実施の例は例示に過ぎず、本発明は当業者の知識に基づいて種々の変更、改良を施した形態で実施することができる。なお、本明細書及び図面において符号が同じ構成要素は、相互に同一のものを示すものとする。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to embodiment shown below. These embodiments are merely examples, and the present invention can be implemented in various modifications and improvements based on the knowledge of those skilled in the art. In the present specification and drawings, the same reference numerals denote the same components.

図１に、本実施形態に係る輝度補正システムの一例を示す。本実施形態に係る輝度補正システムは、カメラ１０及び輝度補正装置２０を備える。輝度補正装置２０は、処理部２１、記憶部２２及び制御部２３を備える。制御部２３は、ディスプレイ１００の表示動作を制御する表示制御部と、ディスプレイ１００の輝度を画素ごとに制御する補正制御部と、として機能する。   FIG. 1 shows an example of a brightness correction system according to the present embodiment. The brightness correction system according to the present embodiment includes a camera 10 and a brightness correction device 20. The brightness correction apparatus 20 includes a processing unit 21, a storage unit 22, and a control unit 23. The control unit 23 functions as a display control unit that controls the display operation of the display 100 and a correction control unit that controls the luminance of the display 100 for each pixel.

輝度補正装置２０は、コンピュータを、処理部２１及び制御部２３として機能させることで実現してもよい。この場合、輝度補正装置２０内のＣＰＵ（Ｃｅｎｔｒａｌ Ｐｒｏｃｅｓｓｉｎｇ Ｕｎｉｔ）が、記憶部２２に記憶されたコンピュータプログラムを実行することで、各構成を実現する。   The brightness correction device 20 may be realized by causing a computer to function as the processing unit 21 and the control unit 23. In this case, each configuration is realized by a CPU (Central Processing Unit) in the brightness correction apparatus 20 executing a computer program stored in the storage unit 22.

図２及び図３に、ディスプレイ１００の一例を示す。ディスプレイ１００は、任意の色を発光する画素が配列されている。各画素は、複数のサブ画素を備え、各サブ画素は異なる色を発光する。例えば、１つの画素は、赤色のサブ画素Ｒ１，１と、緑色のサブ画素Ｇ１，１と、青色のサブ画素Ｂ１，１と、を備える。１つの画素に、この他の色を発光するサブ画素が含まれていてもよい。例えば、図２に示すように、白色のサブ画素Ｗ１，１が含まれていてもよい。また、１つの画素に、同じ色のサブ画素が複数含まれていてもよい。例えば、図２に示すサブ画素Ｗ１，１に代えて、緑色のサブ画素Ｇ１，１が含まれていてもよい。 An example of the display 100 is shown in FIGS. The display 100 has pixels that emit light of an arbitrary color. Each pixel includes a plurality of sub-pixels, and each sub-pixel emits a different color. For example, one pixel includes a red sub-pixel R 1,1 , a green sub-pixel G 1,1, and a blue sub-pixel B 1,1 . One pixel may include sub-pixels that emit other colors. For example, as shown in FIG. 2, white sub-pixels W 1 and 1 may be included. One pixel may include a plurality of sub-pixels of the same color. For example, instead of the sub pixel W 1,1 shown in FIG. 2, a green sub pixel G 1,1 may be included.

カメラ１０は、ディスプレイ１００に表示されたパターンの全体を同時に撮像できるエリアセンサである。解像度は任意である。ディスプレイ１００の画面全体を撮像した画像から各画素の色の階調を検出する必要があるが、各画素が分離できない場合は表示する画素の間隔を広げることで対応する。各サブ画素の色の階調を識別する必要があるため、カメラ１０は、サブ画素の発光色に対する感度を有している。   The camera 10 is an area sensor that can simultaneously image the entire pattern displayed on the display 100. The resolution is arbitrary. Although it is necessary to detect the gradation of the color of each pixel from an image obtained by capturing the entire screen of the display 100, if each pixel cannot be separated, this is dealt with by widening the interval between the pixels to be displayed. Since it is necessary to identify the color gradation of each sub-pixel, the camera 10 has sensitivity to the emission color of the sub-pixel.

本実施形態に係る輝度補正方法は、撮像手順と、特性算出手順と、補正手順と、を順に有する。撮像手順では、カメラ１０が、ディスプレイ１００に表示したパターンを撮像する。特性算出手順では、処理部２１が、個々のサブ画素について、階調に対する輝度特性を算出する。補正手順では、制御部２３が、処理部２１から取得した係数をディスプレイ１００の補正用の情報としてディスプレイ１００に出力する。   The luminance correction method according to the present embodiment includes an imaging procedure, a characteristic calculation procedure, and a correction procedure in order. In the imaging procedure, the camera 10 images the pattern displayed on the display 100. In the characteristic calculation procedure, the processing unit 21 calculates a luminance characteristic with respect to gradation for each sub-pixel. In the correction procedure, the control unit 23 outputs the coefficient acquired from the processing unit 21 to the display 100 as correction information for the display 100.

撮像手順の詳細について説明する。制御部２３は、ディスプレイ１００の画素を構成するいずれか１つのサブ画素の色を、各画素に共通の階調で、ディスプレイ１００に表示する。カメラ１０は、ディスプレイ１００の画面全体を撮像する。このように、本実施形態では、カメラ１００の移動が必要な拡大撮影を行わないため、ステージが必要なく、アライメントがシビアではなく、画像同士のつなぎ目の処理が必要ない。   Details of the imaging procedure will be described. The control unit 23 displays the color of any one of the sub-pixels constituting the pixels of the display 100 on the display 100 with a gradation common to each pixel. The camera 10 images the entire screen of the display 100. As described above, in the present embodiment, since the enlarged photographing that requires the movement of the camera 100 is not performed, the stage is not necessary, the alignment is not severe, and the joint process between the images is not necessary.

ここで、本実施形態では、各画素の階調を測定するために、制御部２３は、ディスプレイ１００の画素を構成するいずれか１つのサブ画素の色を、測定したい各階調について、ディスプレイ１００に表示する。このとき、制御部２３は、ディスプレイ１００の点灯画素を間引くことによって、各画素を分離できるようなパターンを表示する。例えば、縦方向又は横方向或いは両方向の格子状に１つ以上の画素をあけて表示する。点灯画素を間引くことによって、カメラ１０の移動を必要とする拡大撮影を行わずに画素同士の発光を分離することができる。   Here, in this embodiment, in order to measure the gradation of each pixel, the control unit 23 applies the color of any one sub-pixel constituting the pixel of the display 100 to the display 100 for each gradation to be measured. indicate. At this time, the control unit 23 displays a pattern in which each pixel can be separated by thinning out the lighting pixels of the display 100. For example, one or more pixels are displayed in a grid pattern in the vertical direction, the horizontal direction, or both directions. By thinning out the lit pixels, it is possible to separate the light emission of the pixels without performing enlarged shooting that requires movement of the camera 10.

図２に示すディスプレイの場合、１画素のうちの特定色を表示するためのサブ画素同士の間に他の色のサブ画素が配置されている。カメラ１０の撮像した画像において、隣接する画素が分離できるのであれば、パターンは、すべての画素でありかつ画素に含まれる１色のみを表示するパターンとなる。例えば、図２に示すＲ１，１、Ｒ１，２、Ｒ１，３、Ｒ２，１、Ｒ２，２、Ｒ２，３、Ｒ３，１、Ｒ３，２、Ｒ３，３を表示する。赤色のパターンを撮像後、白色、青色、緑色のパターンを順に撮像する。 In the case of the display shown in FIG. 2, sub-pixels of other colors are arranged between sub-pixels for displaying a specific color of one pixel. In the image captured by the camera 10, if adjacent pixels can be separated, the pattern is a pattern that displays all the pixels and only one color included in the pixels. For example, R 1,1 , R 1,2 , R 1,3 , R 2,1 , R 2,2 , R 2,3 , R 3,1 , R 3,2 , R 3,3 shown in FIG. Is displayed. After capturing the red pattern, the white, blue, and green patterns are sequentially captured.

図３に示すディスプレイの場合、１画素のうちの特定色を表示するためのサブ画素同士は縦方向において隣接する。この場合、カメラ１０の撮像した画像において、１つおきの画素が分離できるのであれば、パターンは、横方向にすべての画素でありかつ縦方向に１つおきの画素でありかつ画素に含まれる１色のみを表示するパターンとなる。例えば、図３に示すＲ１，１、Ｒ１，３、Ｒ２，２、Ｒ３，１、Ｒ３，３を表示する。その後、表示されなかった画素、例えば、Ｒ１，２、Ｒ１，１、Ｒ２，３、Ｒ３，２を表示する。赤色のパターンを撮像後、青色、緑色のパターンを順に撮像する。 In the case of the display shown in FIG. 3, the sub-pixels for displaying a specific color of one pixel are adjacent to each other in the vertical direction. In this case, if every other pixel can be separated in the image captured by the camera 10, the pattern is all the pixels in the horizontal direction and every other pixel in the vertical direction and is included in the pixels. This is a pattern that displays only one color. For example, R 1,1 , R 1,3 , R 2,2 , R 3,1 and R 3,3 shown in FIG. 3 are displayed. Then, pixels which are not displayed, for example, R 1,2, R 1,1, R 2,3, displays the R 3,2. After capturing the red pattern, the blue and green patterns are sequentially captured.

このように各サブ画素を測定したい各階調に変化させながらカメラ１０で撮像する。これにより、処理部２１は、ディスプレイ１００の個々のサブ画素について、複数の異なる階調のときの輝度情報を取得することができる。取得した輝度情報は、記憶部２２に記憶される。   In this way, each sub-pixel is imaged by the camera 10 while changing to each gradation to be measured. Thereby, the processing unit 21 can acquire luminance information at a plurality of different gradations for each sub-pixel of the display 100. The acquired luminance information is stored in the storage unit 22.

ここで、測定する階調数は、任意であるが、輝度特性の関数のフィッティングが可能な数である。例えば、本実施形態用いる後述する式（１）の場合、階調数は３以上であることが好ましく、本実施形態では階調数を４とする。   Here, the number of gradations to be measured is arbitrary, but is a number that allows fitting of a function of luminance characteristics. For example, in the case of equation (1) described later used in the present embodiment, the number of gradations is preferably 3 or more, and in this embodiment, the number of gradations is 4.

特性算出手順の詳細について説明する。
図４に、階調に対する輝度特性の一例を示す。本手順では、処理部２１が、記憶部２２に記憶されている輝度情報を用いて、図４に示すような、階調ｇを変数とする輝度特性を表す関数Ｌ（ｇ）を求める。関数Ｌ（ｇ）は、例えば次式で与えられる。
（数１）
Ｌ（ｇ）＝ｋ（ａｇ２＋ｂｇ）γ （１） Details of the characteristic calculation procedure will be described.
FIG. 4 shows an example of luminance characteristics with respect to gradation. In this procedure, the processing unit 21 uses the luminance information stored in the storage unit 22 to obtain a function L (g) representing the luminance characteristics with the gradation g as a variable, as shown in FIG. The function L (g) is given by the following equation, for example.
(Equation 1)
L (g) = k (ag 2 + bg) γ (1)

図２に示すサブ画素Ｒ１，１の輝度を４種類の階調について測定した場合、図４に示すように、点ＰＬ１〜点ＰＬ４の４点がプロットされる。係数ａ及び係数ｂの導出に際しては、最小二乗法を用いて点ＰＬ１〜点ＰＬ４に近い関数Ｌ（ｇ）を求め、これにより係数ａ及び係数ｂを求める。最小二乗法を適用するに当たっては、階調ごとに重みづけが異なってもよい。 When the luminance of the sub-pixel R 1,1 shown in FIG. 2 is measured for four types of gradations, four points PL 1 to PL 4 are plotted as shown in FIG. In deriving the coefficient a and the coefficient b, a function L (g) close to the point PL 1 to the point PL 4 is obtained by using the least square method, and thereby the coefficient a and the coefficient b are obtained. In applying the least square method, the weight may be different for each gradation.

少ない階調数の測定と少ない係数で画素毎の階調対輝度の特性を表すことができる式（１）でフィッティングすることにより、測定階調数と補正データ量を減らすことができる。このため、記憶部２２のメモリ使用量を小さくすることができる。   The number of measured gradations and the amount of correction data can be reduced by fitting with Equation (1) that can represent the characteristics of gradation versus luminance for each pixel with a small number of gradations and a small coefficient. For this reason, the memory usage of the memory | storage part 22 can be made small.

処理部２１は、式（１）のａ，ｂ，ｋ，γを求める。ａ，ｂは画素毎に求める。ｋ，γは、画素毎に求めてもよいが、ガンマカーブが画素によらず同じ場合は画素全体で一つの値を求めてもよい。ガンマカーブの画素依存性はゆるやかに変化することが多いため、同一の行または列ではほぼ同じガンマカーブになることがある。その場合、図５に示すように、同一の行または列の画素の平均値を階調毎に求め、それをフィッティングしてｋ，γを求めることができる。画素毎にｋ，γを求める場合、ａ，ｂ，ｋ，γを画素ごとに求める必要があるため、最低４階調、できれば５階調以上の測定を行うことが好ましい。   The processing unit 21 obtains a, b, k, and γ in Expression (1). a and b are obtained for each pixel. k and γ may be obtained for each pixel, but if the gamma curve is the same regardless of the pixel, one value may be obtained for the entire pixel. Since the pixel dependency of the gamma curve often changes slowly, the same row or column may have almost the same gamma curve. In that case, as shown in FIG. 5, an average value of pixels in the same row or column can be obtained for each gradation, and fitted to obtain k and γ. When k and γ are obtained for each pixel, it is necessary to obtain a, b, k, and γ for each pixel. Therefore, it is preferable to measure at least 4 gradations, preferably 5 gradations or more.

このように、特性算出手順を実行することで、処理部２１は、式（１）における係数ｋ及びγ並びに各サブ画素の係数ａ及び係数ｂを導出することができる。これにより、各サブ画素の輝度特性を用いて、各サブ画素の輝度特性を補正することができる。これらの係数は、記憶部２２に記憶される。このときに、処理部２１は、輝度特性の逆関数を求めてもよい。   In this way, by executing the characteristic calculation procedure, the processing unit 21 can derive the coefficients k and γ and the coefficient a and coefficient b of each subpixel in Expression (1). Thereby, the luminance characteristic of each sub-pixel can be corrected using the luminance characteristic of each sub-pixel. These coefficients are stored in the storage unit 22. At this time, the processing unit 21 may obtain an inverse function of the luminance characteristic.

補正手順の詳細について説明する。
処理部２１は、記憶部２２から係数を読み出して制御部２３に出力する。制御部２３は、処理部２１から取得した係数を、ディスプレイ１００の補正用の情報としてディスプレイ１００に出力する。このとき、制御部２３は、輝度特性の逆関数を、ディスプレイ１００の補正用の関数としてディスプレイ１００に出力してもよい。ディスプレイ１００は、取得した係数又は逆関数を用いて、サブ画素ごとに所望の輝度特性をなるように補正する。 Details of the correction procedure will be described.
The processing unit 21 reads the coefficient from the storage unit 22 and outputs it to the control unit 23. The control unit 23 outputs the coefficient acquired from the processing unit 21 to the display 100 as correction information for the display 100. At this time, the control unit 23 may output an inverse function of the luminance characteristic to the display 100 as a function for correcting the display 100. The display 100 corrects the desired luminance characteristic for each sub-pixel using the acquired coefficient or inverse function.

本実施形態に係る発明は、サブ画素ごとに輝度特性を補正するため、有機ＥＬディスプレイ特有の画素毎の輝度バラつきを、画素毎、階調毎に補正することができる。また移動しながらの測定に比べて極めてシンプルなシステム構成であり、短時間で画素毎の輝度を測定することができる。   Since the invention according to this embodiment corrects the luminance characteristics for each sub-pixel, the luminance variation for each pixel unique to the organic EL display can be corrected for each pixel and each gradation. In addition, the system configuration is extremely simple compared to measurement while moving, and the luminance of each pixel can be measured in a short time.

さらに、本実施形態に係る発明は、輝度ムラが大きく出荷基準に満たないパネルでも、補正を行うことによって出荷基準を満たすことができるため、パネル生産の歩留まりを上げることができる。また出荷パネルのグレード分けも可能になる。   Furthermore, the invention according to the present embodiment can increase the yield of panel production since the shipping standard can be satisfied by performing correction even for a panel having large luminance unevenness and less than the shipping standard. In addition, shipping panels can be graded.

本発明はディスプレイ産業に適用することができる。   The present invention can be applied to the display industry.

１０：カメラ
２０：輝度補正装置
２１：処理部
２２：記憶部
２３：制御部
１００：ディスプレイ 10: Camera 20: Brightness correction device 21: Processing unit 22: Storage unit 23: Control unit 100: Display

Claims (4)

ディスプレイの画素を構成する１つのサブ画素の色を、各画素とも共通の階調でありかつ各画素を分離できるようなパターンで前記ディスプレイに表示する表示制御部と、
前記ディスプレイに表示されたパターンの全体を同時に撮像した画像でありかつ、当該撮像を各サブ画素及び複数の階調について順次行った画像を用いて、個々のサブ画素の階調に対する輝度特性を算出する処理部と、
前記ディスプレイに対し、各サブ画素の輝度特性を、前記処理部の求めた輝度特性に基づいて補正する補正制御部と、
を備える輝度補正装置。 A display control unit that displays the color of one sub-pixel constituting a pixel of the display on the display in a pattern in which each pixel has a common gradation and can separate each pixel;
Using the image obtained by capturing the entire pattern displayed on the display at the same time and sequentially performing the imaging for each subpixel and multiple tones, the luminance characteristics for each subpixel tone are calculated. A processing unit to
A correction control unit that corrects the luminance characteristics of each sub-pixel based on the luminance characteristics obtained by the processing unit for the display;
A brightness correction apparatus comprising: 前記表示制御部は、格子状に１つ以上の画素をあけて前記ディスプレイに表示することで、各画素を分離できるようなパターンで前記ディスプレイに表示する、
請求項１に記載の輝度補正装置。 The display control unit displays one or more pixels in a grid pattern on the display, and displays the display on the display in a pattern that can separate each pixel.
The brightness correction apparatus according to claim 1. 請求項１又は２に記載の輝度補正装置と、
前記ディスプレイに表示されたパターンの全体を同時に撮像した画像でありかつ、当該撮像を各サブ画素及び複数の階調について順次行った画像を撮像するカメラと、
を備える輝度補正システム。 The brightness correction apparatus according to claim 1 or 2,
A camera that captures an image of the entire pattern displayed on the display at the same time, and that captures an image obtained by sequentially performing the imaging for each sub-pixel and a plurality of gradations;
A brightness correction system comprising: ディスプレイの画素を構成する１つのサブ画素の色を、各画素とも共通の階調でありかつ各画素を分離できるようなパターンで前記ディスプレイに表示し、カメラが、前記ディスプレイに表示されたパターンの全体を同時に撮像し、当該撮像を各サブ画素及び複数の階調について順次行う撮像手順と、
処理部が、個々のサブ画素の階調に対する輝度特性を算出する特性算出手順と、
制御部が、前記ディスプレイに対し、各サブ画素の輝度特性を、前記特性算出手順で求めた輝度特性に基づいて補正する補正手順と、
を順に有する輝度補正方法。 The color of one sub-pixel constituting the pixel of the display is displayed on the display in a pattern in which each pixel has a common gradation and the pixels can be separated, and the camera has a pattern of the pattern displayed on the display. An imaging procedure for imaging the whole at the same time and sequentially performing the imaging for each sub-pixel and a plurality of gradations;
A characteristic calculation procedure in which the processing unit calculates a luminance characteristic for the gradation of each sub-pixel;
A correction procedure in which the control unit corrects the luminance characteristics of each sub-pixel with respect to the display based on the luminance characteristics obtained in the characteristic calculation procedure;
The brightness correction method which has these in order.
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