Method and apparatus for displaying halftone in a liquid crystal display
US7391398B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 18, 2004 |
| Grant date | Jun 24, 2008 |
| Priority date | — |
| Expiry date | Aug 9, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0247
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An liquid crystal display (LCD) device uses a method for displaying halftone without causing luminance differences among pixels when an FRC technique is used, and without causing stripe-shaped luminance variations when a flicker component is eliminated spatially. The LCD device includes a data splitter, a pixel location detecting circuit, a frame number determining circuit, an applied timing memory circuit, an applied voltage determining circuit, a summation process circuit, and a timing adjusting circuit. The LCD device determines driving voltages such that for each of a high voltage or a low voltage during these 2N frames, the number of applying positive voltages is the same as the number of applying negative voltages where a unit period is 2N frames for multi-gray-level display of (1+N) levels. The LCD device can improve image quality since the average luminance of each pixel is made uniform.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.