Backlight module and display device for privacy protection
US11536437B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 28, 2022 |
| Grant date | Dec 27, 2022 |
| Priority date | — |
| Expiry date | Apr 28, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133608
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The backlight module includes multiple backlight units. Each backlight unit includes a first light emitting unit and multiple second light emitting units. The first light emitting unit has a first beam angle, and each second light emitting unit has a second beam angle which is narrower than the first beam angle. In a first mode, a light intensity of the first light emitting unit is equal to a first intensity, and a light intensity of the second light emitting units is equal to a second intensity. In a second mode, the light intensity of the first light emitting unit is equal to a third intensity, and the light intensity of the second light emitting units is equal to a fourth intensity. The first intensity is greater than the third intensity, and the second intensity is less than the fourth intensity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.