Optical touch input device and driving method thereof
US10359830B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2011 |
| Grant date | Jul 23, 2019 |
| Priority date | — |
| Expiry date | Feb 4, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/50
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Disclosed are an optical touch input device which divisionally adjusts optical output of a light emitting unit before and during a touch operation to reduce power consumption, and a driving method thereof, the optical touch input device includes a display panel, a plurality of infrared light emitting elements disposed on two adjacent sides of the display panel, a lens unit disposed on the remaining two adjacent sides of the display panel and reflecting light emitted from the infrared light emitting elements, a light receiving unit disposed on the two adjacent sides of the display panel, and a touch control unit including a touch coordinate calculation unit to calculate a set of coordinates of a touch point and a light emission control unit to divide optical outputs of the infrared light emitting elements into optical output during touch and optical output during non-touch and to lower the optical output during non-touch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.