JPS635778U

JPS635778U -

Info

Publication number: JPS635778U
Application number: JP9916586U
Authority: JP
Priority date: 1986-06-30
Filing date: 1986-06-30
Publication date: 1988-01-14

Description

[Brief explanation of the drawing]

第１図は本考案の画面表示回路の一実施例を示
すブロツク図、第２図は第１図の水平同期信号の
振分け回路の一例を示す回路図、第３図は第１図
の回路動作を説明するためのタイミングチヤート
、第４図は第３図のタイミングチヤートに対応し
た画面表示例を示す説明図、第５図は従来の画面
表示回路のブロツク図、第６図は第５図の回路動
作を説明するタイミングチヤート、第７図は第６
図のタイミングチヤートに対応した画面表示例を
示す説明図、第８図は第５図の回路で３１．５Ｋ
Ｈｚの水平同期信号を使用してノンインターレー
ス表示したときのタイミングチヤート、第９図は
第８図のタイミングチヤートに対応した画面表示
例を示す説明図である。１１……水平同期信号の振分け回路、１２，１
３……文字発生回路、１４……クロツク発生回路
、１５……制御回路、１６……ミキシング回路、
１７……文字重畳回路、１８……ＣＲＴ。 Fig. 1 is a block diagram showing one embodiment of the screen display circuit of the present invention, Fig. 2 is a circuit diagram showing an example of the horizontal synchronization signal distribution circuit of Fig. 1, and Fig. 3 is the circuit operation of Fig. 1. 4 is an explanatory diagram showing a screen display example corresponding to the timing chart in FIG. 3, FIG. 5 is a block diagram of a conventional screen display circuit, and FIG. 6 is a diagram showing a screen display example corresponding to the timing chart in FIG. Timing chart explaining circuit operation, Fig. 7 is Fig. 6
An explanatory diagram showing an example of a screen display corresponding to the timing chart in the figure.
FIG. 9 is an explanatory diagram showing an example of a screen display corresponding to the timing chart of FIG. 8, which is a timing chart when non-interlaced display is performed using a horizontal synchronizing signal of Hz. 11...Horizontal synchronization signal distribution circuit, 12,1
3...Character generation circuit, 14...Clock generation circuit, 15...Control circuit, 16...Mixing circuit,
17...Character superimposition circuit, 18...CRT.

Claims

[Claims for Utility Model Registration] A screen display circuit that displays an image on a cathode ray tube by being supplied with a television signal having a horizontal scanning frequency of 31.5 KHz, comprising: 31.5 KHz included in the television signal;
A horizontal synchronization signal distribution circuit for alternately distributing the horizontal synchronization signal of z every cycle and outputting the first and second horizontal synchronization signals of 15.74 KHz, and the first horizontal synchronization signal from this distribution circuit. a first screen display signal generation circuit that generates a screen display signal for characters and graphics based on the vertical synchronization signal included in the television signal and the television signal; a second horizontal synchronization signal from the distribution circuit; a second screen display signal generation circuit that generates screen display signals for characters and graphics based on the vertical synchronization signal; and a screen display signal generation circuit that generates screen display signals from the first and second screen display signal generation circuits. A screen display circuit comprising a circuit for outputting an image signal included in a television signal to a cathode ray tube in addition to an image signal included in a television signal.