Circular backlight for a liquid crystal display
US10061073B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 20, 2017 |
| Grant date | Aug 28, 2018 |
| Priority date | — |
| Expiry date | Jan 20, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2201/56
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A liquid crystal display (LCD) device including a circular backlight that illuminates an LCD panel. The backlight is disposed behind the LCD panel and includes a light guide and an array of light emitting diodes (LEDs). The light guide includes a circular top surface, a circular bottom surface, and a connecting surface between the top and bottom surface. The array of LEDs are disposed along the connecting side surface of the light guide in a circular arrangement to emit light into in first directions toward a center of the light guide. The light guide receives the light from the array of LEDs in the first directions and directs the light in a second direction toward the LCD panel from the circular top surface. The backlight can include brightness enhancement films (BEFS), such as first BEF having concentric circular stripe prisms, and a second BEF having radial stripe prisms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.