Light emitting display device, electronic equipment into which the same device is loaded, and drive method of the light emitting display device
US7212179B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 23, 2005 |
| Grant date | May 1, 2007 |
| Priority date | — |
| Expiry date | Oct 29, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0233
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A correction voltage retaining capacitor C2, a correction voltage write transistor Tr4, and a switching transistor Tr5 are added to a pixel structure of an SES drive method provided with an organic EL element E1 as a light emitting element, a light emission drive transistor Tr1, a data write transistor Tr2, and an erase transistor Tr3 which can erase electrical charges in a light emission maintaining capacitor C1. With the ON operation of the erase transistor Tr3, the correction voltage write transistor Tr4 is turned on, and the switching transistor Tr5 is turned off. In this state, the threshold voltage (Vth) of the light emission drive transistor Tr1 is written in the correction voltage retaining capacitor C2. When pixels are lit, by a gate-to-source voltage obtained by adding the threshold voltage written in the correction voltage retaining capacitor C2 to a data voltage written in the light emission maintaining capacitor C1, drain current of the light emission drive transistor Tr1 flows. Thus, among respective pixels, a lighting operation is performed in a state in which variations of light emission intensities caused by variations of threshold voltages of the light emission dr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.