JPH05273939A - Led dot matrix display device - Google Patents

Led dot matrix display device

Info

Publication number
JPH05273939A
JPH05273939A JP6694892A JP6694892A JPH05273939A JP H05273939 A JPH05273939 A JP H05273939A JP 6694892 A JP6694892 A JP 6694892A JP 6694892 A JP6694892 A JP 6694892A JP H05273939 A JPH05273939 A JP H05273939A
Authority
JP
Japan
Prior art keywords
brightness
led
data
dot matrix
correction data
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.)
Granted
Application number
JP6694892A
Other languages
Japanese (ja)
Other versions
JP3268001B2 (en
Inventor
Masanao Koba
正直 木場
Kazuhisa Murata
和久 村田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to JP6694892A priority Critical patent/JP3268001B2/en
Publication of JPH05273939A publication Critical patent/JPH05273939A/en
Application granted granted Critical
Publication of JP3268001B2 publication Critical patent/JP3268001B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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  • Processing Of Color Television Signals (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

PURPOSE:To provide an LED dot matrix display device in which all LED emis sion brightness are easily and exactly made uniform so that even television receiver pictures can be displayed. CONSTITUTION:A correction data memory 2 is provided in which beforehand computed brightness correction data are stored corresponding to dot positions so that the respective LEDs are made to have a constant brightness based on each LED measured brightness of all dots on a dot matrix LED display unit 1. A data changing means 3 transforms input picture data to corrected picture data based on the brightness correction data and the corrected picture data are temporarily stored in video memories 4a and 4b. Display driving means 8 to 10 perform emission control of each LED based on the stored data of the memories 4a and 4b. Therefore, all LEDs have a same brightness by controlling emission time, for example, in accordance with the brightness of each LED and thus, a picture of a television receiver is displayed with full color having a gradation expression.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、例えばテレビジョン受
像機の画像等を映し出すことにも利用できる高品位の表
示を行なえるLEDドットマトリックス型表示装置に関
するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED dot matrix type display device capable of high quality display which can be used for displaying an image of a television receiver, for example.

【0002】[0002]

【従来の技術】斯かるLEDドットマトリックス型表示
装置では、高品位な画質を得るために各ドットを構成す
る多数個のLEDの輝度を可及的に均一化する必要があ
り、以下のような手段を講じている。即ち、C.O.B
(チップ オン ボンド)タイプの表示装置では、同一
ウエハ内における近接箇所に特性が同程度のLEDチッ
プが形成され易い性質を利用してウエハー内における出
来る限り小さな領域からピックアップしたLEDチップ
を集めてダイボンデイングしている。また、LEDラン
プをマウントすることにより構成する表示装置では、各
LEDランプの輝度を測定して一定範囲内の輝度のもの
を選択してマウントする手段が採用されている。
2. Description of the Related Art In such an LED dot matrix type display device, in order to obtain a high quality image, it is necessary to make the brightness of a large number of LEDs forming each dot as uniform as possible. I am taking steps. That is, C.I. O. B
In a (chip-on-bond) type display device, LED chips picked up from the smallest possible area in the wafer are collected by using the property that LED chips having similar characteristics are easily formed in the vicinity of the same wafer. Bonding. In addition, a display device configured by mounting LED lamps employs a means for measuring the brightness of each LED lamp and selecting and mounting one having a brightness within a certain range.

【0003】[0003]

【発明が解決しようとする課題】然し乍ら、LEDチッ
プの輝度は多少を問わず個々にばらつきがあり、しかも
その分布は非常に広い。そのため、多色化や多チップを
図った場合、前述のような方法で製造した表示装置には
どうしてもLEDによるドット間に輝度のばらつきが発
生してしまい、また、完成品となった表示装置のドット
間の輝度のばらつきを修正することは不可能であった。
However, the brightness of the LED chips has some variations, and the distribution thereof is very wide. Therefore, in the case of multi-coloring and multi-chip manufacturing, the display device manufactured by the above-described method inevitably causes a variation in the brightness between the dots formed by the LEDs, and the display device of the finished product. It was impossible to correct the variation in brightness between dots.

【0004】このような輝度のばらつきの存在が、発光
色に階調表現を持たせて濃淡のある画面を表示しようと
する場合の大きな障害となっており、また、1組の赤,
緑および青の各色のLEDにより各ドットを構成してフ
ルカラー表示する場合、各LEDの輝度が均一でない
と、それらの各々の発光色を混成しても所要の色が合成
されないが、青色LEDは赤色および緑色の各LEDに
対し相対的に輝度が低い。このことが、例えばテレビジ
ョン画像用のデータを入力して階調表現を有するフルカ
ラー表示を行なえるLEDドットマトリックス型表示装
置の実現を阻害する要因になっている。
The existence of such a variation in brightness is a major obstacle in displaying a screen with light and shade by giving gradation expression to the luminescent color, and a set of red,
When each dot is composed of green and blue LEDs and full-color display is performed, if the brightness of each LED is not uniform, the required colors are not combined even if the respective emission colors are mixed, but the blue LED is The brightness is relatively low for each of the red and green LEDs. This is a factor that hinders the realization of an LED dot matrix type display device capable of performing full-color display having gradation expression by inputting data for television images, for example.

【0005】そこで本発明は、各LEDの輝度を容易に
且つ正確に均一化してテレビジョン受像機の画像をも表
示できるようなLEDドットマトリックス型表示装置を
提供することを技術的課題とするものである。
Therefore, it is a technical object of the present invention to provide an LED dot matrix type display device capable of easily and accurately equalizing the brightness of each LED and displaying an image of a television receiver. Is.

【0006】[0006]

【課題を解決するための手段】本発明は、上記した課題
を達成するための技術的手段として、LEDドットマト
リックス型表示装置を次の通り構成した。即ち、各ドッ
トを各々構成する多数個のLEDをドットマトリックス
状に配列したドットマトリックス型LED表示ユニット
と、全ドットの前記各LEDの各々の測定輝度に基づき
予め算出された該各LEDをそれぞれ一定輝度にするた
めの輝度補正データがドット位置に対応させて各アドレ
スに記憶された補正データ用メモリと、前記LED表示
ユニットに表示すべく入力された画像データを前記補正
データ用メモリから順次読み出された輝度補正データに
基づき演算して修正画像データに変換するデータ変換手
段と、このデータ変換手段により算出された該修正画像
データを記憶するビデオメモリと、このビデオメモリに
記憶の修正画像データに基づき前記LED表示ユニット
を発光駆動する表示駆動手段とを備えてなることを特徴
として構成されている。
As a technical means for achieving the above-mentioned object, the present invention has constituted an LED dot matrix type display device as follows. That is, the dot matrix type LED display unit in which a large number of LEDs forming each dot are arranged in a dot matrix, and the respective LEDs calculated in advance based on the measured brightness of the respective LEDs of all the dots are fixed. The correction data memory in which the brightness correction data for making the brightness correspond to the dot position is stored at each address, and the image data input to be displayed on the LED display unit are sequentially read from the correction data memory. Data conversion means for calculating the corrected image data based on the calculated brightness correction data, a video memory for storing the corrected image data calculated by the data conversion means, and the corrected image data stored in the video memory. Display driving means for driving the LED display unit to emit light based on the above It is configured.

【0007】[0007]

【作用】ドットマトリックス型LED表示ユニットの各
LEDに輝度のばらつきが存在しても、それらの輝度を
予め測定するとともに、その測定輝度を一定化するため
の輝度補正データを作成して補正データ用メモリにドッ
ト位置に対応させて記憶しておき、表示すべき画像デー
タを輝度補正データに基づきデータ変換手段が演算して
修正画像データに変更し、この修正画像データをビデオ
メモリに一時記憶させて表示駆動手段によりドットマト
リックス型LED表示ユニットを駆動するので、LED
自体が有する輝度に応じて例えば発光時間が制御されて
全てのLEDが同一輝度で発光駆動される。従って、テ
レビジョン受像機の画像を階調表現を有するフルカラー
で表示することもできる。
Even if the LEDs of the dot matrix type LED display unit have variations in luminance, the luminance is measured in advance, and the luminance correction data for making the measured luminance constant is created and used for the correction data. The image data to be displayed is stored in the memory in correspondence with the dot position, and the data conversion means calculates the image data to be displayed based on the brightness correction data to change it to the corrected image data. The corrected image data is temporarily stored in the video memory. Since the dot matrix type LED display unit is driven by the display driving means,
For example, the light emission time is controlled according to the brightness of itself, and all the LEDs are driven to emit light with the same brightness. Therefore, the image of the television receiver can be displayed in full color having gradation expression.

【0008】[0008]

【実施例】以下、本発明の好適な一実施例について図面
を参照しながら詳細に説明する。図1はテレビジョン受
像機の画像データを入力して階調表現を有するフルカラ
ー表示に適用した場合の本発明の一実施例のブロック構
成を示し、ドットマトリックス型LED表示ユニット
(1)として、各ドットを赤色、緑色および青色の各1
個のLEDを組み合わせて構成した16×16ドットの
ものを例示してあり、フルカラー機能を有する。このL
ED表示ユニット(1)の全てのLEDの輝度が各ドッ
ト毎および各発光色毎に予め測定されるとともに、各ド
ットの輝度をそれぞれ一定値にするのに必要な輝度補正
データが予め算出され、3色に対応する3個のP−RO
Mからなる補正データ用メモリ(2)に、前述の輝度補
正データが色セレクト信号に指定された色毎に区分され
且つメモリアドレス信号により指定された各々のドット
位置に対応するアドレス番地に記憶されている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a block configuration of an embodiment of the present invention when the image data of a television receiver is input and applied to a full color display having gradation expression. Each of the dot matrix type LED display units (1) 1 dot for each of red, green and blue
An example of 16 × 16 dots configured by combining a plurality of LEDs is illustrated, and has a full color function. This L
The brightness of all the LEDs of the ED display unit (1) is measured in advance for each dot and each emission color, and the brightness correction data necessary for setting the brightness of each dot to a constant value is calculated in advance. 3 P-RO corresponding to 3 colors
In the correction data memory (2) consisting of M, the above-mentioned brightness correction data is stored for each color designated by the color select signal and stored in the address address corresponding to each dot position designated by the memory address signal. ing.

【0009】そして、テレビジョン画像用のデータ等の
画像データが入力されると、この画像データの水平走査
方向の1行分が乗算器(3)に入力されるとともに、こ
の画像データに同期した色セレクト信号およびメモリア
ドレス信号により指定された補正データ用メモリ(2)
のアドレスから輝度補正データが読み出されて乗算器
(3)に入力され、乗算器(3)において画像データに
輝度補正データを掛け合わせて各ドットを一定の輝度で
発光させるための修正画像データに変換される。この修
正画像データが、色セレクト信号およびメモリアドレス
信号により指定されたビデオメモリ(4a)のアドレス
番地にリード・ライト切換信号により順次書き込まれ、
1行分の修正画像データの書き込みが終了した後に、同
様にして得られた次の1行分の修正画像データがビデオ
メモリ(4b)に書き込まれる。
When image data such as television image data is input, one row in the horizontal scanning direction of this image data is input to the multiplier (3) and synchronized with this image data. Correction data memory specified by color select signal and memory address signal (2)
Corrected image data for reading the brightness correction data from the address of No. 1 and input to the multiplier (3), and multiplying the image data by the brightness correction data in the multiplier (3) to cause each dot to emit light with a constant brightness. Is converted to. The corrected image data is sequentially written by the read / write switching signal at the address address of the video memory (4a) designated by the color select signal and the memory address signal,
After the writing of the modified image data for one row is completed, the next modified image data for one row obtained in the same manner is written in the video memory (4b).

【0010】次に、リード・ライト切換信号の読み出し
指令に基づき色セレクト信号およびメモリアドレス信号
により指定されたビデオメモリ(4a)のアドレス番地
から順次読み出された3色の修正画像データが、緑色
用、赤色用および青色用の各表示データ形成回路
(5),(6),(7)に個別に入力されて階調表示す
るための表示データに変換された後に、16ビットの緑
色用,赤色用および青色用の各セグメントドライバー
(8),(9),(10)とこれらのコモンドライバー
(11)を介してドットマトリックス型LED表示ユニ
ット(1)が発光駆動され、画像データによる画面がフ
ルカラーで階調表示される。各表示データ形成回路
(5),(6),(7)は何れも同一構成であるため、
図示した緑色用表示データ形成回路(5)についてのみ
説明する。修正画像データが、16個の4ビットラッチ
回路(5a)に入力されてラッチされることによりシリ
アルな信号からパラレルな信号に変換された後に、16
個の4ビットデジタルコンパレータ(5b)においてB
CDカウンタ(5c)からの階調クロック信号のカウン
ト信号と比較され、例えば16までカウントする間に輝
度データに対応する回数だけ発光させることにより、人
間の目の残像現象を利用して画像が階調表示されること
になる。画像データを輝度補正データに基づき演算した
修正画像データによって各LEDの発光時間を制御して
いるので、各LEDが均等な輝度で発光されて各々の発
光色の混成により所要の色が合成される。
Next, the corrected image data of three colors sequentially read from the address address of the video memory (4a) designated by the color select signal and the memory address signal based on the read command of the read / write switching signal is green. For each of the display data forming circuits (5), (6), and (7) for red, blue, and blue, and after being converted into display data for gradation display, The dot matrix LED display unit (1) is driven to emit light through the red and blue segment drivers (8), (9), (10) and these common drivers (11), and a screen based on image data is displayed. Full color gradation display. Since each display data forming circuit (5), (6), (7) has the same configuration,
Only the illustrated green display data forming circuit (5) will be described. The corrected image data is input to and latched by 16 four-bit latch circuits (5a) to be converted from a serial signal to a parallel signal,
B in each 4-bit digital comparator (5b)
The image is compared with the count signal of the grayscale clock signal from the CD counter (5c), and is emitted by the number of times corresponding to the luminance data while counting up to 16, for example. It will be displayed in key. Since the light emission time of each LED is controlled by the corrected image data obtained by calculating the image data based on the brightness correction data, each LED emits light with uniform brightness and a desired color is synthesized by mixing the respective light emission colors. ..

【0011】[0011]

【発明の効果】以上ように本発明のLEDドットマトリ
ックス型表示装置によると、ドットマトリックス型LE
D表示ユニットの各LEDの輝度のばらつきを予め測定
するとともに、その測定輝度を一定化するための輝度補
正データを作成して補正データ用メモリにドット位置に
対応させて記憶しておき、表示すべき画像データを輝度
補正データに基づきデータ変換手段が演算して修正画像
データに変更し、この修正画像データをビデオメモリに
一時記憶させて表示駆動手段によりドットマトリックス
型LED表示ユニットを駆動する構成としたので、LE
D自体が有する輝度に応じて例えば発光時間を制御して
全てのLEDを同等の輝度で発光させることができるた
め、テレビジョン受像機の画像を階調表現を有するフル
カラーで表示することもできる顕著な効果を得ることが
できる。
As described above, according to the LED dot matrix type display device of the present invention, the dot matrix type LE is used.
The brightness variation of each LED of the D display unit is measured in advance, and the brightness correction data for making the measured brightness constant is created and stored in the correction data memory in correspondence with the dot position and displayed. The data conversion means calculates the power image data based on the brightness correction data to change it into corrected image data, and the corrected image data is temporarily stored in the video memory, and the display driving means drives the dot matrix type LED display unit. I did, so LE
Since, for example, the light emission time can be controlled according to the brightness of D itself to cause all the LEDs to emit light at the same brightness, it is possible to display the image of the television receiver in full color having gradation expression. It is possible to obtain various effects.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例のブロック構成図である。FIG. 1 is a block diagram of an embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1 ドットマトリックス型LED表示ユニット 2 補正データ用メモリ 3 乗算器(データ変換手段) 4a,4b ビデオメモリ 8 緑色用セグメントドライバー(表示駆動手段) 9 赤色用セグメントドライバー(表示駆動手段) 10 青色用セグメントドライバー(表示駆動手段) 1 dot matrix type LED display unit 2 correction data memory 3 multipliers (data conversion means) 4a, 4b video memory 8 green segment driver (display driving means) 9 red segment driver (display driving means) 10 blue segment driver (Display driving means)

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 各ドットを各々構成する多数個のLED
をドットマトリックス状に配列したドットマトリックス
型LED表示ユニットと、全ドットの前記各LEDの各
々の測定輝度に基づき予め算出された該各LEDをそれ
ぞれ一定輝度にするための輝度補正データがドット位置
に対応させて各アドレスに記憶された補正データ用メモ
リと、前記LED表示ユニットに表示すべく入力された
画像データを前記補正データ用メモリから順次読み出さ
れた輝度補正データに基づき演算して修正画像データに
変換するデータ変換手段と、このデータ変換手段により
算出された該修正画像データを記憶するビデオメモリ
と、このビデオメモリに記憶の修正画像データに基づき
前記LED表示ユニットを発光駆動する表示駆動手段と
を備えてなることを特徴とするLEDドットマトリック
ス型表示装置。
1. A large number of LEDs each constituting each dot
And a dot matrix type LED display unit in which the dots are arranged in a dot matrix, and brightness correction data for making the respective LEDs have a constant brightness calculated in advance based on the measured brightness of each LED of all dots at the dot position. The correction data memory correspondingly stored at each address and the image data input to be displayed on the LED display unit are calculated on the basis of the brightness correction data sequentially read from the correction data memory to obtain a corrected image. Data conversion means for converting to data, a video memory for storing the corrected image data calculated by the data conversion means, and display driving means for driving the LED display unit to emit light based on the corrected image data stored in the video memory. An LED dot matrix type display device comprising:
JP6694892A 1992-03-25 1992-03-25 LED dot matrix type display device Expired - Lifetime JP3268001B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6694892A JP3268001B2 (en) 1992-03-25 1992-03-25 LED dot matrix type display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6694892A JP3268001B2 (en) 1992-03-25 1992-03-25 LED dot matrix type display device

Publications (2)

Publication Number Publication Date
JPH05273939A true JPH05273939A (en) 1993-10-22
JP3268001B2 JP3268001B2 (en) 2002-03-25

Family

ID=13330750

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6694892A Expired - Lifetime JP3268001B2 (en) 1992-03-25 1992-03-25 LED dot matrix type display device

Country Status (1)

Country Link
JP (1) JP3268001B2 (en)

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JPH1078766A (en) * 1996-07-30 1998-03-24 Yunisupurei Sa Display system
WO2000028516A1 (en) * 1998-11-08 2000-05-18 Nongqiang Fan Active matrix lcd based on diode switches and methods of improving display uniformity of same
EP1067505A2 (en) * 1999-07-08 2001-01-10 Nichia Corporation Image display apparatus with light emitting elements
US6313814B1 (en) 1998-09-30 2001-11-06 Mitsubishi Denki Kabushiki Kaisha Display control circuit for display panel
EP1204087A1 (en) * 1999-03-24 2002-05-08 Avix Inc. Fullcolor led display system
JP2003173162A (en) * 2001-09-28 2003-06-20 Semiconductor Energy Lab Co Ltd Method for driving light emitting device
JP2003173164A (en) * 2001-09-28 2003-06-20 Semiconductor Energy Lab Co Ltd Method for driving light emitting device
JP2003177713A (en) * 2001-09-28 2003-06-27 Semiconductor Energy Lab Co Ltd Light emitting device and electronic apparatus
JP2003177714A (en) * 2001-09-28 2003-06-27 Semiconductor Energy Lab Co Ltd Light emitting device and electronic apparatus
WO2005124734A1 (en) * 2004-06-18 2005-12-29 Kabushiki Kaisha Toshiba Video display device and video display device luminance characteristic correction method
JP2006162728A (en) * 2004-12-03 2006-06-22 Seiko Epson Corp Image display apparatus, image signal conversion apparatus, image signal conversion method, image signal conversion program and recoding medium stored with the program
JP2006343762A (en) * 2001-09-28 2006-12-21 Semiconductor Energy Lab Co Ltd Light emitting device and electronic apparatus
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