Active matrix display device with storage capacitor for each pixel
US6812912B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 2002 |
| Grant date | Nov 2, 2004 |
| Priority date | — |
| Expiry date | Apr 30, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/136213
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An active matrix display device employing a top gate type TFT structure has a storage capacitor Csc and a liquid crystal capacitor Clc in each pixel of a pixel section, a first electrode of the storage capacitor Csc served by a p-Si active layer of the TFT, and a second electrode formed to at least partly overlap the active layer, with an insulating layer between the active layer and the second electrode below it. When a driver section is to be built in, the driver section TFT is the same top gate type as the pixel section TFT, and an active layer is made of the same material as the active layer and has a conductive layer which is made of the same material as the second electrode with the insulating layer held between the active layer and the conductive layer below it. The pixel section can form the storage capacitor while preventing lowering of the aperture ratio. Because conditions for the polycrystalization annealing of the active layer are equal for the pixel section TFT and the driver section TFT, TFTs with the same properties can be obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.