Stereoscopic LCD shutter glass driver system
US6529175B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 2001 |
| Grant date | Mar 4, 2003 |
| Priority date | — |
| Expiry date | Jun 3, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G1/06
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The preferred embodiment a stereoscopic LCD shutter glass driver system requires only a total of 3 CMOS integrated circuit chips in order to convert horizontal and vertical sync signals into LCD shutter glass drive signals. A negative charge pump is used increase the LCD drive voltage thereby reducing 3D crosstalk in the image. The video signal input is shown with a passthrough connection intended for direct hook-up to a television or CRT monitor. A first flip flop detects vertical and horizontal sync and is used to drive the charge pump. A stable, predictable field ID signal is produced by the flip flop whose two complimentary outputs act as inputs to a second flip flop chip which produces the drive signals for the LCD shutter glasses. A third flip flop produces a LCD “common” signal that is sent to both LCD shutters. The second flip flop produces a drive signal for each LCD shutter. A field swap between the two shutters is implemented with a switch located at the output of the third flip flop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.