Image display
US6184627A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1999 |
| Grant date | Feb 6, 2001 |
| Priority date | — |
| Expiry date | Aug 17, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/28
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image display device has a plurality of electrodes that control a beam between a group of linear cathodes (2) and a screen (8) with a phosphor layer, and is provided with a circuit (31) for generating a beam track offset signal, which generates a signal for slightly oscillating one of the beams horizontally, a PIN photodiode (33) for detecting the emission amount of the phosphor layer for this beam, a comparator (35) for generating a beam irradiation position misalignment signal based on the detected emission amount, an integrating circuit (36) for generating a beam position control signal in correspondence with the beam irradiation position misalignment signal; and a horizontal deflection electrode driving circuit (39) for driving a horizontal deflection electrode (6) in accordance with the beam position control signal. With this configuration, misalignments of the position of the beam spot and the phosphor stripes on the screen, which are caused for various reasons, can be suppressed, and an image display device is obtained, in which a deterioration of the image quality, such as color misalignments, does not occur.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.