Photosensor for display device

Details Photosensor for display device Photosensor for display device

2009-02-19

2011-12-20

Huber, Paul (Department: 2627)

Computer graphics processing and selective visual display system

Display driving control circuitry

Light detection means

Reexamination Certificate

active

08081176

ABSTRACT:
A photosensor for a display device includes a light receiver, a reset unit, and a sample unit. The light receiver is used for receiving ambient light to generate a photovoltage. The light receiver includes a first transistor and a first conversion unit that transforms the output of the first transistor into the photovoltage. The reset unit is used for providing an initiated reference voltage in response to a reset signal and includes a second transistor and a third transistor that are connected with each other, where the first conversion unit is discharged through the third transistor to obtain the initiated reference voltage when the second transistor is turned on. The sample unit is used for outputting the photovoltage in respond to a sample signal, the sample unit comprising a fourth transistor in respond to the sample signal and a second conversion unit that transforms the output of the fourth transistor into the photovoltage.

REFERENCES:
patent: 7218048 (2007-05-01), Choi et al.
patent: 2005/0087825 (2005-04-01), Cok
patent: 2005/0151065 (2005-07-01), Min
patent: 2005/0218302 (2005-10-01), Shin et al.
patent: 2006/0077167 (2006-04-01), Kim et al.

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