Method of testing liquid crystal display substrates
US5465052A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 10, 1991 |
| Grant date | Nov 7, 1995 |
| Priority date | — |
| Expiry date | Sep 10, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1309
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Construction defects in liquid crystal display base plates are detected by placing an electro-optical element, in which the optical properties change when an electric field is applied thereto, over and facing a liquid crystal display base plate, energizing the leads of said display base plate, irradiating the base plate with a light beam through the electro-optical element, and converting the optical changes detected for each pixel element electrode into a voltage distribution. The testing method in this invention is capable of identifying not only whether or not a pixel element electrode is functional, but also if a functional pixel element electrode is functioning as desired or not. Application of the testing method of this invention is able to test liquid crystal display base plates, including those which show ambiguous display irregularities. Electro-optical elements change their optical properties when an electrical field is applied thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.