Patent ID: 8300125
Filing Date: 2012-10-30
Classification: H01L,H04N

Abstract:
1. A method for sensing light using a charge map array, comprising: applying a bias stress to a plurality of pixels in the charge map array, thereby trapping charge carriers in each of the plurality of pixels responsive to the bias stress; transmitting light toward the plurality of pixels in the charge map array, thereby releasing the trapped charge carriers in a first portion of the plurality of pixels responsive to transmitting the light; determining a threshold voltage shift in the first portion and a second portion of the plurality of pixels by applying a scanning gate pulse to a gate of a switching TFT of each of the plurality of pixels, and reading a current value from a TFT light sensing element of each of the plurality of pixels by applying a read voltage to a source of the switching TFT of each of the plurality of pixels to transfer a read gate voltage to the TFT light sensing element and reading the current value at a drain of the TFT light sensing element to determine the threshold voltage shift in each of the plurality of pixels; and comparing the threshold voltage shift in the first portion of the plurality of pixels to the threshold voltage shift in the second portion of the plurality of pixels.