Display device
US8816285B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 2011 |
| Grant date | Aug 26, 2014 |
| Priority date | — |
| Expiry date | Oct 30, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/042
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A photosensor-equipped display device is provided having a combination of visible and non-visible light sources where a voltage drop is minimized when the non-visible light sources are turned on. The display device includes: a plurality of infrared LEDs (3b); photosensors (9) provided in a pixel region (4) for detecting reflected light originating from the infrared LEDs (3b); a sensor row driver circuit (7) configured to supply a sensor drive signal to the photosensors (9); an amplifier circuit (6) configured to amplify a signal read from the photosensors (9) in response to the sensor drive signal and output a photosensor signal; a signal processing circuit (20) configured to process the photosensor signal output from the amplifier circuit (6); and a backlight control circuit (13) configured to control on and off of the infrared LEDs (3b). The plurality of photosensors (9) are divided into a plurality of sensor groups in the pixel region (4). The light source control circuit (13) causes separate sets of infrared LEDs (3b), corresponding to the sensor groups, to be on during different time periods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.