Dual purpose touch sensor panel and optical retarder
US9158143B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 2011 |
| Grant date | Oct 13, 2015 |
| Priority date | — |
| Expiry date | Sep 26, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133638
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
When a user operates a touch sensor panel having an LCD device outdoors or in a bright environment, light reflecting off the device can create glare. In order to reduce glare, a user can view the device through polarized filters such as polarized sunglasses. Doing so can reduce the visibility of the image displayed on the LCD. A quarter-wave retardation film can be added to the touch sensor panel's LCD device to mitigate these effects by producing circularly polarized light. However, adding a separate quarter-wave retardation film can increase the thickness and cost of manufacturing the touch sensor panel. Embodiments of the present disclosure are directed to a touch sensor panel constructed from a base film having quarter-wave retardation properties that can produce circularly polarized light. Because the base film has the desired optical properties, a separate quarter-wave retardation film may not be needed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.