Active matrix display device compensating for ageing of the display element and variations in drive transistor threshold voltage
US9214107B2 · kind B2 · utility
9Cited by
7References
26Claims
0Family size
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Key dates
| Filing date | Aug 26, 2004 |
| Grant date | Dec 15, 2015 |
| Priority date | — |
| Expiry date | Jul 6, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2360/148
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An active matrix LED display has a light-dependent device for detecting the brightness of the display element and threshold voltage measurement circuitry for measuring a threshold voltage of a pixel the drive transistor. Compensation for ageing of the display element is thus provided by an optical feedback path, and compensation for drive transistor threshold variations is provided by measurement of the threshold voltage. This provides a reliable compensation scheme for the threshold voltage variations, while also providing ageing compensation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.