Active matrix liquid crystal display substrate with island structure covering break in signal bus line and method of producing same
US5867233A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 26, 1997 |
| Grant date | Feb 2, 1999 |
| Priority date | — |
| Expiry date | Mar 26, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1368
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In an active matrix substrate of a liquid crystal display using a TFT as a switching device for each pixel, a gate bus line and a drain bus line extending perpendicular to each other are formed simultaneously by patterning a metal film, and one of the two bus lines is broken to provide a gap across which the other extends. The gap is covered by an island structure of a gate dielectric film and a semiconductor layer formed to provide the TFT, and a supplementary bus line makes direct contact with the broken bus line on both sides of the gap to provide a bridge over the gap. The supplementary bus line is formed together with a pixel electrode by patterning a transparent conductor film. By this arrangement of bus lines, the total number of photolithography steps in the production process is decreased so that the production cost can be reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.