Image display unit with screen input function

摘要

An image display unit with screen input function is provided, by which it is possible to input image data directly to a screen without decreasing numerical aperture of pixel. The image display unit comprises a light detecting TFT 61 receiving a light entering from a screen of a liquid crystal display panel, said light detecting TFT 61 is connected in series to a switching TFT 60, which does not receive a light entering from the screen of the liquid crystal display panel. To a source electrode of the light detecting TFT 61, a storage capacitor Cst and a pixel electrode of a liquid crystal element are connected. The liquid crystal element is represented by a capacitor CLC. A sensor control line 140 is connected to the gate electrode of the light detecting TFT 61, and a gate line 120 is connected to the gate electrode of the switching TFT 60. A data line 110 is connected to the drain electrode of the switching TFT 60, and a storage line 150 is connected to one end of a storage capacitor Cst. An image signal is sent to a pixel electrode (ITO) of the liquid crystal element (CLC). The light detecting TFT 61 transmits photoelectric current Isig generated by sensing the light to a sensor signal processing circuit (see FIG. 1) via the data line 110.

主权项

1. An image display unit with screen input function for inputting information by touching operation to a pixel area comprised of a plurality of pixels on a screen formed on a first insulating substrate, said image display unit comprising, for each of said plurality of pixels:
a first thin-film transistor shielded from projection of light coming from the direction of a pixel surface, and a second thin-film transistor connected in series with the first thin-film transistor and not shielded from projection of light coming from the direction of the pixel surface; a gate electrode of said first thin-film transistor being connected to an associated gate line; a gate electrode of said second thin-film transistor being connected to an associated sensor control line; a drain electrode or a source electrode of said first thin-film transistor being connected to an associated data line; and a storage capacitor having a first electrode connected to a source electrode or a drain electrode of said second thin-film transistor and to a first pixel electrode of said pixel, wherein said second thin-film transistor is turned on by a sensing time selecting signal from said sensor control line during a period different from an image display period of said pixel, and photoelectric current generated by projection light sensing of said second thin-film transistor is accumulated as electric charge in said storage capacitor, and wherein said accumulated electric charge is read out on said data line as light detecting current via said first thin-film transistor, and, after voltage conversion, said electric charge is provided as a detection signal of said touching operation.