Patent ID: 9218081
Filing Date: 2015-12-22
Classification: G02F,G06F,G09G,Y02D

Abstract:
1. A semiconductor display device comprising: a panel including a pixel portion and a driver circuit, the driver circuit being configured to input an image signal to the pixel portion in a first period when a driving signal and a power supply potential are supplied to the driver circuit, and being configured to stop an input of the image signal to the pixel portion in a second period when supply of the driving signal and the power supply potential to the driver circuit is stopped; a touch panel overlapping with the pixel portion; a CPU configured to select whether or not the driving signal and the power supply potential are supplied to the driver circuit in accordance with an operation signal supplied from the touch panel; and a display control circuit configured to control the supply of the driving signal and the power supply potential to the driver circuit in accordance with an instruction supplied from the CPU, wherein the pixel portion comprises a display element configured to perform display in accordance with voltage of the image signal, and a transistor configured to control retention of the voltage, wherein the transistor comprises an oxide semiconductor, wherein a driving frequency of the driver circuit is changed whether an image displayed in the pixel portion is a still image or a moving image, wherein the pixel portion displays the still image in the first period and the second period, and wherein a length of the second period is changed in accordance with the operation signal supplied from the touch panel.