Abstract: In order to enhance accuracy of determination as to whether an object has contacted a screen and to enhance accuracy of calculation of a coordinate position of the object, edges of an imaged image are detected by an edge detection circuit 76, and by using the edges, it is determined by a contact determination circuit 77 whether or not the object has contacted the screen. Moreover, in order to appropriately control sensitivity of optical sensors in response to external light, by a calibration circuit 93, a drive condition of the optical sensors is changed based on output values of the optical sensors, which are varied in response to the external light.

Abstract: In order to enhance accuracy of determination as to whether an object has contacted a screen and to enhance accuracy of calculation of a coordinate position of the object, edges of an imaged image are detected by an edge detection circuit 76, and by using the edges, it is determined by a contact determination circuit 77 whether or not the object has contacted the screen. Moreover, in order to appropriately control sensitivity of optical sensors in response to external light, by a calibration circuit 93, a drive condition of the optical sensors is changed based on output values of the optical sensors, which are varied in response to the external light.

Abstract: A liquid crystal display includes a scan line driver (12) to drive scan lines and a power source (14) to supply voltage to the scan line driver. The scan line driver and power source are formed directly on an array substrate of the liquid crystal display. The liquid crystal display also includes a signal-line-driving IC (15) mounted on the array substrate. The IC incorporates a power source (DC voltage converter (1508) and voltage stabilizer (1509)) to supply voltage to a signal line driver (analog output circuit (1504) and the like). The power source in the IC is integrated according to a low-withstanding-voltage manufacturing process. With these configurations, the liquid crystal display is compact and is manufacturable at a low cost.