High refresh rate displays with synchronized local dimming
US9984638B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 2015 |
| Grant date | May 29, 2018 |
| Priority date | — |
| Expiry date | Nov 13, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2340/0435
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A display may have a first stage such as a color liquid crystal display stage and a second stage such as a monochromatic liquid crystal display stage that are coupled in tandem so that light from a backlight passes through both stages. The first (upper) stage may be a high resolution display panel that is operated at a first refresh rate while the second (lower) stage is a low resolution display panel that is operated at a second refresh rate that is greater than the first refresh rate. In particular, the second stage may be configured to provide localized dimming that is synchronized to one or more moving objects in the video frames to be displayed to help reduce the perceived motion blur. The localized dimming may be provided via insertion of a black image portion that only overlaps with the moving objects, a blanking row that tracks the moving objects, a black frame, etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.