Shift register and liquid crystal display device for detecting anomalous sync signal
US8952880B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 2008 |
| Grant date | Feb 10, 2015 |
| Priority date | — |
| Expiry date | Feb 12, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2330/025
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A display panel drive circuit includes a shift register constructed of unit circuits connected in stages. The unit circuits generate signal line selection signals, respectively, which signal line selection signals are made active for a respective certain period of time to form a respective pulse, and the pulses are outputted successively from respective unit circuits in order of ordinal number starting from a first stage until an end stage. In at least one embodiment, each of the unit circuits receive (i) clock signals generated based on a sync signal received from outside of the display panel drive circuit, (ii) a start pulse signal generated based on the sync signal, or a signal line selection signal generated in a stage different from its own stage, and (iii) a clear signal. The clear signal is made active in a case where anomalousness is included in the sync signal, and no pulse is outputted from the shift register until a subsequent vertical scanning period starts. This configuration achieves a display panel drive circuit which prevents display disorder or holds down increase in load given to a power source, each of which occurs in a case where anomalousness is included in the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.