Patent ID: 8081176
Filing Date: 2011-12-20
Classification: G09G

Abstract:
1. A photosensor for a display device, comprising: a light receiver for receiving ambient light to generate a photovoltage whose magnitude is in proportion to the amount of the ambient light received by the light receiver, the light receiver comprising a first transistor and a first conversion unit that transforms the output of the first transistor into the photovoltage; a reset unit for providing an initiated reference voltage in response to a reset signal and comprising a second transistor and a third transistor that are connected with each other, the control terminal of the second transistor being connected to the reset signal and the control terminal of the third transistor being connected to the first conversion unit, wherein the first conversion unit is discharged through the third transistor to obtain the initiated reference voltage when the second transistor is turned on; and a sample unit 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.