Light guide substrate and a backlight module including ihe same
US11360257B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 2021 |
| Grant date | Jun 14, 2022 |
| Priority date | — |
| Expiry date | Apr 28, 2041 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21V33/0052
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light guide substrate includes first and second triangular prisms juxtaposed to each other on a light exit face thereof. Each of the first and second triangular prisms has a rounded vertex. The number of the first triangular prisms is smaller than the number of the second triangular prisms. Each first triangular prism has a first height from the light exit face. Each second triangular prisms has a second height from the light exit face. The second height is between 20 and 90 percent of the first height. A backlight module includes the aforesaid light guide substrate, a reverse prism sheet disposed on the light guide substrate, and a light emitting unit to emit light rays into the light substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.