Patent ID: 8227740

Claim:
A photo detector device configured for use with a display device, the photo detector device comprising: a plurality of first conductive lines extending in parallel with each other; a plurality of second conductive lines extending in parallel with each other, wherein the plurality of first conductive lines is orthogonal to the plurality of second conductive lines; a plurality of switching transistors, each of the switching transistors being disposed near one of the first conductive lines and one of the second conductive lines and comprising: a drain; a source; and a gate; wherein the sources are electrically connected to the second conductive line, the gates are electrically connected to the first conductive line, and the first conductive lines receive a control signal to control on/off states of the switching transistors; and a plurality of photosensitive transistors, each of the photosensitive transistors being disposed near one of the first conductive lines and one of the second conductive lines and comprising: a photosensitive transistor drain; a photosensitive transistor source; and a photosensitive transistor gate; in each of the photosensitive transistors, the photosensitive transistor source is electrically connected to one of the drains of the switching transistors, and the photosensitive transistor gate is connected to and maintained at the potential of the photosensitive transistor drain, without a storage capacitor physically between the photosensitive transistor source and the photosensitive transistor drain.