Sharp Kabushiki Kaisha Corporation

Ichiroh Shiraki

Kazuhiro Maeda

Keisuke Yoshida

Shingo Johgan

Sachio Tsujino

Yousuke Nakagawa

Atsushi Okada

Hiroaki Sugiyama

Nobuhiro Kuwabara

In a display device with optical sensors, a mode control portion () determines a mode to be a normal mode in which to operate a recognition processing portion () or a standby mode in which to stop the recognition processing portion () from operating. In transition from the normal mode to the standby mode, a decimated image memory () stores a decimated image having a smaller number of pixels than a scan picture. The mode control portion () performs pixel-by-pixel comparison between the stored decimated image and an image supplied anew, which is obtained by averaging decimated images for two consecutive frames, and causes transition from the standby mode to the normal mode when the number of pixels whose difference in pixel values is greater than or equal to a first threshold is greater than or equal to a second threshold. As a result, it is rendered possible to inhibit erroneous determination and promptly detect a touch position after a quick exit from the standby mode.

Display device including optical sensors

By reducing the potential drop of a storage node that occurs due to feedthrough, the capacitance of a storage capacitor is reduced and sensor sensitivity is improved. In a photosensor, the first terminal of a storage capacitor (C) and the gate of a MOS transistor (M), which outputs a signal in accordance with the potential of a storage node (N), are connected to the storage node (N). A forward biased pulse voltage is supplied to the anode of a first photodiode (DS) in a reset period, and a reverse biased voltage is supplied to the anode of the first photodiode in a storage period and a readout period. A reverse biased voltage is supplied to the anode of a second photodiode (DM) in all operation periods. A voltage that keeps the potential of the storage node lower than the threshold value of the MOS transistor (M) is supplied to the second terminal of the storage capacitor in the reset period and the storage period, and a voltage that thrusts the potential of the storage node (N) upward to the threshold value of the MOS transistor (M) or higher is supplied to the second terminal of the storage capacitor in the readout period.

Photosensor operating in accordacne with specific voltages and display device including same

A color filter substrate includes a base member, a color filter layer, and spacers. The color filter layer is provided on the base member and made up of first, second and third groups of color filters, which transmit light rays representing three different colors, respectively. The spacers are provided at predetermined relative positions for selected ones of the color filters. The selected color filters consist of color filters belonging to the first group, color filters belonging to the second group, and color filters belonging to the third group. The spacers are arranged such that in the selected color filters, the smallest number of color filters of the first, second or third group is at least 80% of the largest number of color filters of the first, second or third group.

Color filter substrate and display device

Color filter substrate with plurality of spacers having predetermined relative positions for selected ones of color filters and display device

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Osaka, Japan

Ichiroh Shiraki