Optical sensing device having plural sensing units each receives scanning signals with different voltage levels

摘要

An optical sensing device includes a plurality of scanning lines having a plurality of first scanning lines and a plurality of second scanning lines, a plurality of sensing lines, a plurality of reading lines, and a plurality of optical sensing modules electrically connected to the scanning lines. Each optical sensing module includes a first optical sensing unit and a second optical sensing unit, each of which includes a sensing unit, a charge storage unit, and a reading unit. The optical sensing module further includes a plurality of differential amplifiers electrically connected to the corresponding reading lines, for determining the difference between the reading lines, wherein the difference indicates the ambient light variation. A first transistor of the sensing unit of the first optical sensing unit is different to a first transistor of the sensing unit of the second sensing unit in channel width.

主权项

1. An optical sensing device, comprising:
a plurality of scanning lines, comprising a plurality of first scanning lines and a plurality of second scanning lines; a plurality of sensing lines; a plurality of reading lines; a plurality of optical sensing modules, electrically coupled to corresponding scanning lines, wherein each optical sensing module comprises a first optical sensing unit and a second optical sensing unit, and each of the first optical sensing unit and the second optical sensing unit comprises:
a plurality of sensing units, each of the sensing units comprising:
a first terminal, electrically coupled to a corresponding sensing line among the sensing lines;a second terminal; anda control terminal, electrically coupled to a corresponding scanning line among the scanning lines, wherein each of the sensing units receives scanning signals with different voltage levels and each of the sensing units is fabricated with at least one semiconductor transistor;a charge storage unit, having a first terminal electrically coupled to the second terminal of each of the sensing units and a second terminal electrically coupled to a common voltage terminal; anda reading unit, comprising:
a first terminal, electrically coupled to the second terminal of the sensing units;a second terminal, electrically coupled to a corresponding reading line among the reading lines; anda control terminal, electrically coupled to a corresponding scanning line among the scanning lines; and a plurality of differential amplifiers, electrically coupled to the reading lines correspondingly, wherein each differential amplifier has two input terminals respectively and electrically coupled to the corresponding reading line in the first optical sensing unit and the corresponding reading line in the second optical sensing unit, and is used for computing an ambient light variation related to the optical sensing module; wherein an equivalent transistor channel width of the plurality of sensing units in the first optical sensing unit is different from an equivalent transistor channel width of the plurality of sensing units in the second optical sensing unit.