Transparent thin-film EL display apparatus with ambient light adaptation means
US5757127A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 9, 1995 |
| Grant date | May 26, 1998 |
| Priority date | — |
| Expiry date | Jun 9, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60K2360/331
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A transparent thin-film EL display apparatus has a transparent thin-film EL element formed on a glass substrate. A rear substrate consisting of photochromic glass and the glass substrate on which the EL element is formed are disposed facing each other with the EL element located in between. A light-transmitting insulation material is inserted in a space between the two substrates and hermetically sealed. When the display on the EL element becomes hard to see due to light entering from the rear of the display apparatus, the photochromic glass reacts in response to the light and darkens the rear of the EL element, thereby blocking the light. Accordingly, normally the display apparatus displays various items of information through the front substrate and ensures visibility of the background through the display apparatus, and when high-intensity external light enters through the rear, the display apparatus reacts and blocks this light by means of a light shutter function, thereby enabling reliable display of the information without impairment of display contrast, thus guaranteeing a stable and highly reliable display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.