Addressing method and system having minimal crosstalk effects
US5473338A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 16, 1993 |
| Grant date | Dec 5, 1995 |
| Priority date | — |
| Expiry date | Jun 16, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G3/2022
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The optical response of the pixels of many flat panel display devices, such as liquid crystal displays (2), depends upon the spectral components, as well as the rms value, of the pixel voltage waveform during a frame period. Because each row and column electrode (10 and 11) addresses multiple pixels (14), the spectral voltage components of the voltage across any pixel during a frame period will depend upon the optical state of other pixels in the same column (11). This crosstalk phenomena can be greatly reduced by modifying the addressing signals. One method of modifying the addressing signals is to modulate them so that the spectral components of all pixel voltage waveforms fall primarily in a frequency band (54) in which the optical response is nearly independent of the frequency. Another method is to analyze (220) the spectral components of the pixel voltage waveform over a frame period before it is displayed and adjust (222) the amplitude of the addressing signals to compensate for the frequency dependence of the optical response. When using a gray scale addressing method involving an adjustment factor, such as one based upon virtual pixels (266), the value of each virtual info…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.