JPS5544227A - Automatic adjusting system for high luminance white balance - Google Patents
Automatic adjusting system for high luminance white balanceInfo
- Publication number
- JPS5544227A JPS5544227A JP11650578A JP11650578A JPS5544227A JP S5544227 A JPS5544227 A JP S5544227A JP 11650578 A JP11650578 A JP 11650578A JP 11650578 A JP11650578 A JP 11650578A JP S5544227 A JPS5544227 A JP S5544227A
- Authority
- JP
- Japan
- Prior art keywords
- white
- cathode current
- signal
- scanning period
- primary
- 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
Links
Landscapes
- Processing Of Color Television Signals (AREA)
Abstract
PURPOSE: To automatically correct the distortion in white balance due to time aging of the drive performance of a receiving tube for several horizontal scanning periods which reside in the vertical scanning period for the beginning and the end of the luminance signal.
CONSTITUTION: During several horizontal scanning period at the beginning and end of the vertical scanning period of luminance signal, white signal is inserted to the video output circuit 24 from the white signal insertion circuit 20, and after detecting the cathode current of three primary colors around the white level of the three primary electron gun of the receiving tube, each cathode current is gated with the white signal at the gate circuits 30∼31, the low frequency component of the cathode current of three primary colors obtained is picked up from the filters 33∼35, and the reference voltage equal to the Ik ratio representing the white signal is subtracted from the subtraction circits 40 and 41 from the value that one primary color cathode current is taken as reference and other two primary color cathode currents are divided at the division circuits 40 and 41 respectively, and negative feedback is made to the video output circuit 24 with the amplification factor control signal obtained.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11650578A JPS5544227A (en) | 1978-09-25 | 1978-09-25 | Automatic adjusting system for high luminance white balance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11650578A JPS5544227A (en) | 1978-09-25 | 1978-09-25 | Automatic adjusting system for high luminance white balance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5544227A true JPS5544227A (en) | 1980-03-28 |
| JPS6126753B2 JPS6126753B2 (en) | 1986-06-21 |
Family
ID=14688792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11650578A Granted JPS5544227A (en) | 1978-09-25 | 1978-09-25 | Automatic adjusting system for high luminance white balance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5544227A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61245688A (en) * | 1985-04-24 | 1986-10-31 | Sony Corp | Automatic white balance adjusting circuit |
| US4723158A (en) * | 1986-05-14 | 1988-02-02 | Zenith Electronics Corporation | Method and apparatus for performing scan line diagnostic testing in a video monitor during a last-line overscan of a normal display raster |
-
1978
- 1978-09-25 JP JP11650578A patent/JPS5544227A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61245688A (en) * | 1985-04-24 | 1986-10-31 | Sony Corp | Automatic white balance adjusting circuit |
| JPH0695766B2 (en) * | 1985-04-24 | 1994-11-24 | ソニー株式会社 | Automatic white balance adjustment circuit |
| US4723158A (en) * | 1986-05-14 | 1988-02-02 | Zenith Electronics Corporation | Method and apparatus for performing scan line diagnostic testing in a video monitor during a last-line overscan of a normal display raster |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6126753B2 (en) | 1986-06-21 |
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