Cholesteric liquid crystal writing board
US10509250B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 2018 |
| Grant date | Dec 17, 2019 |
| Priority date | — |
| Expiry date | Jun 11, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04103
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A cholesteric liquid crystal writing board comprises a cholesteric liquid crystal device, a photo-sensing array layer and a mode control unit. The photo-sensing array layer is disposed at one side of the light-emitting surface of the cholesteric liquid crystal device. The photo-sensing array layer comprises a plurality of gate control lines and a plurality of mode control lines. The mode control unit comprises a main control circuitry and a plurality of mode switches coupled to the main control circuitry. Each mode switch is coupled to one of the mode control lines correspondingly. The gate control lines intersect with the mode control lines so as to define a plurality of light sensing areas arranged in an array. Each light sensing area has a switch element and a light-sensing element. The main control circuitry controls each mode switch to be switched between a voltage output mode and a voltage write mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.