Display device and electronic watch using the device
US6229767A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1998 |
| Grant date | May 8, 2001 |
| Priority date | — |
| Expiry date | Jul 30, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/134327
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A display device and an electronic watch permit various information to be clearly distinguished from a background when a solar battery is placed within a display area for displaying the information. A display device and the like include a polarizer, a liquid crystal layer, a polarization separating film, and a solar battery. The polarization separating film operates to transmit linearly polarized light polarized in one direction and to reflect other linearly polarized light. Since the surface of the solar battery has a dark color, such as black, a dark-colored background is displayed by light traveling along an optical path. Information, such as numbers, is displayed in a light reflection color by light that is reflected by the polarization separating film and travels along an optical path. The information, such as numbers, is displayed in a light reflection color. Therefore, information, such as numbers, can be displayed in a high contrast when the solar battery is placed within an inner region of the display plane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.