JPS6142174U

JPS6142174U - Brightness control circuit in color display device

Info

Publication number: JPS6142174U
Application number: JP12798284U
Authority: JP
Inventors: 義己縫村
Original assignee: 株式会社東芝
Priority date: 1984-08-22
Filing date: 1984-08-22
Publication date: 1986-03-18

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は本考案に係るカラーディスプレイ装置における
輝度制御回路の構成図、第２図は第１図の回路において
入力切換えに伴うコントラスト制、御電圧対画面輝度の
変化を示す特性図、第３図はビデオ／データ切換用ＩＣ
の構成図、第４図は従来のカラーディスプレイ装置にお
ける輝度制御回路の構成図である。１０−・・信号発生装置、１１・・・ビデオ／データ切
換用ＩＣ，１２・・・電源供給端、１３・・・可変抵抗
、１７・・・抵抗、Ｒ，Ｇ，Ｂ１・・・ビデオ入力端子
、Ｒ２，Ｇ２，Ｂ２・・・データ入力端子、Ｒ３，Ｇ３
Ｂ３・・・出力端子、Ｓ・・・ビデオ／データ切換端
子、Ｃ・・・コントラスト制御端子、Ｐ・・・クランプ
用端子、ＳＷ・・・外部スイッチ、Ｖｃｃ・・・直流電
圧。FIG. 1 is a block diagram of a brightness control circuit in a color display device according to the present invention, FIG. 2 is a characteristic diagram showing contrast control and changes in control voltage versus screen brightness in the circuit of FIG. 1 due to input switching, and FIG. The figure shows the video/data switching IC.
FIG. 4 is a block diagram of a brightness control circuit in a conventional color display device. 10-...Signal generator, 11...Video/data switching IC, 12...Power supply end, 13...Variable resistor, 17...Resistor, R, G, B1...Video input Terminal, R2, G2, B2...Data input terminal, R3, G3
B3...Output terminal, S...Video/data switching terminal, C...Contrast control terminal, P...Clamp terminal, SW...External switch, Vcc...DC voltage.

Claims

[Claim for Utility Model Registration] The three primary color signal numbers are input from the input terminals of two systems, and after passing through a circuit with a different gain for each system, they are input to a switching device and applied to the switching terminal of the switching device. The difference is that one of the three primary color signals is selected by changing the voltage, and this selected signal is further input to a contrast adjuster to perform contrast control according to the control voltage applied to the control terminal of the adjuster. A two-manpower switching circuit configured to output display signals of the three primary colors through a DC regenerator; A signal generator that inputs the same three primary color signals into terminals, and a signal generator connected to the switching terminal of the switching device in the two-man power switching circuit, which creates different voltages depending on the on and off operations of the switch, and A switching voltage generating circuit is connected to a control terminal of the contrast adjuster in the two-man power switching circuit, and is connected to a control terminal of the contrast adjuster in the two-man power switching circuit, and generates a continuously variable control voltage. 1. A brightness control circuit for a color display device, characterized in that the brightness level of a display signal to be output is switched in accordance with signal selection.