JPH0190088U - - Google Patents
Info
- Publication number
- JPH0190088U JPH0190088U JP18578787U JP18578787U JPH0190088U JP H0190088 U JPH0190088 U JP H0190088U JP 18578787 U JP18578787 U JP 18578787U JP 18578787 U JP18578787 U JP 18578787U JP H0190088 U JPH0190088 U JP H0190088U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- crt
- rectangular wave
- display area
- image display
- 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
- 238000010586 diagram Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
Landscapes
- Details Of Television Scanning (AREA)
Description
第１図はこの考案の一実施例であるＣＲＴデイ
スプレイ装置のフオーカス補正回路を示すブロツ
ク構成図、第２図は考案のフオーカス補正回路に
おける各部の電圧波形図、第３図はこの考案の他
の実施例を示すＣＲＴデイスプレイ装置のフオー
カス補正回路ブロツク構成図、第４図は従来のＣ
ＲＴデイスプレイ装置のフオーカス補正回路を示
すブロツク構成図、第５図は従来のフオーカス補
正回路における各部の電圧波形図である。
図において、１……電圧比較器、２……増幅回
路、３……積分回路、４……積分回路、５……出
力回路、６……結合コンデンサ、７……計数回路
、８……一致回路、９……反転回路、１０……計
数回路、１１……一致回路、１２……反転回路、
１３……保持回路、１４……積分回路、１５……
積分回路、１６……出力回路、１７……結合コン
デンサ、１８……フライバツクトランス、１９…
…ＣＲＴ、２０……フオーカスグリツドを示す。
なお、図中同一符号は同一、又は相当部分を示す
。
Fig. 1 is a block configuration diagram showing a focus correction circuit of a CRT display device which is an embodiment of this invention, Fig. 2 is a voltage waveform diagram of each part of the focus correction circuit of this invention, and Fig. 3 is a diagram of another part of this invention. FIG. 4 is a block diagram of a focus correction circuit for a CRT display device showing an embodiment of the present invention.
FIG. 5 is a block diagram showing a focus correction circuit of an RT display device. FIG. 5 is a voltage waveform diagram of various parts in a conventional focus correction circuit. In the figure, 1... Voltage comparator, 2... Amplifying circuit, 3... Integrating circuit, 4... Integrating circuit, 5... Output circuit, 6... Coupling capacitor, 7... Counting circuit, 8... Matching. circuit, 9...inversion circuit, 10...counting circuit, 11...matching circuit, 12...inversion circuit,
13...Holding circuit, 14...Integrator circuit, 15...
Integrating circuit, 16... Output circuit, 17... Coupling capacitor, 18... Flyback transformer, 19...
...CRT, 20...indicates a focus grid.
Note that the same reference numerals in the figures indicate the same or equivalent parts.
Claims (1)
小さく、かつ上下および左右それぞれ対称な位置
に表示されるＣＲＴデイスプレイ装置において、
セツトアツプレベルを有したモノクロビデオ信号
を入力とし、このビデオ信号のセツトアツプレベ
ルを検出し画像の表示エリアに対応した矩形波信
号を発生する回路及び上記矩形波信号をカウント
する計数回路を備え、上下・左右それぞれ表示サ
イズに対応した補正電圧を発生することを特徴と
するダイナミツクフオーカス補正回路。 In a CRT display device in which the image display area on the CRT is smaller than the CRT size and is displayed in symmetrical positions vertically and horizontally,
A circuit receives a monochrome video signal having a setup level, detects the setup level of the video signal, and generates a rectangular wave signal corresponding to an image display area, and a counting circuit counts the rectangular wave signal, A dynamic focus correction circuit that is characterized by generating correction voltages corresponding to the display sizes of the top, bottom, left and right sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18578787U JPH0190088U (en) | 1987-12-04 | 1987-12-04 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18578787U JPH0190088U (en) | 1987-12-04 | 1987-12-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0190088U true JPH0190088U (en) | 1989-06-14 |
Family
ID=33446915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18578787U Pending JPH0190088U (en) | 1987-12-04 | 1987-12-04 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0190088U (en) |
-
1987
- 1987-12-04 JP JP18578787U patent/JPH0190088U/ja active Pending
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