Front light for use with reflective displays
US12416757B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 2024 |
| Grant date | Sep 16, 2025 |
| Priority date | — |
| Expiry date | Jun 28, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1677
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Devices, systems, and methods are provided for a front light for use with reflective displays. A display device (such as an e-reader, for example) may include a light source and a light guide able to receive first light from the light source. The light guide includes a plurality of extraction features that control optimal movement of light emitted by the light source through a display stack of the display device. The extraction feature is provided in a wedge shape at an angle such that when light refracts from the extraction feature, it is directed towards the reflective LCD display at an incidence angle close to the display normal for the reflected light to exhibit similar properties as the reflected light from the EPD panel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.