Patent ID: 8842095

Claim:
A light sensing circuit, comprising: a light-sensitive oxide semiconductor transistor including a channel layer of a light-sensitive oxide semiconductor, a row selection line supplying a row selection signal to a gate of the light-sensitive oxide semiconductor transistor; a driving voltage line supplying a driving voltage to a drain of the light-sensitive oxide semiconductor transistor; and a data line connected to a source of the light-sensitive oxide semiconductor transistor and outputting data, the light-sensitive oxide semiconductor transistor being configured to operate as a light sensing device that senses light incident on the transistor and as a switching circuit that outputs data in response to the sensed incident light without storing charges associated with the incident light, in a storage element, wherein, when the gate voltage is a first voltage, the channel layer is in a non-conducting state irrespective of an intensity or amount of the incident light and no data is outputted, and when the gate voltage is a second voltage, the channel layer is in a conducting state when light is incident on the transistor and data is outputted as current corresponding to an intensity or an amount of the incident light.