Norio Tada

24.4: Optical Sensor Embedded Input Display Usable under High-Ambient-Light Conditions

We have developed a new LCD having optical input function usable under high ambient-light conditions. Sensors having different sensitivities are dispersed in the panel, and a sensor driver circuit to control the sensor exposure time are formed monolithically in peripheral using LTPS technology. These two approaches contribute synergistically to widen the range of ambient light condition available for the input function.

Incorporation of input function into displays using LTPS TFT technology

— A new display in which an input function is incorporated has been developed by using LTPS TFT technology. A new circuit configuration that includes a lateral p-i-n diode with an in-pixel amplifier, an LTPS A/D converter on the periphery of the glass substrate and an external image-processing LSI is presented. The experimental results of two major applications of the image-capture function and touch-panel function are discussed.

21.4L: Late‐News Paper: A Touch Panel Function Integrated LCD Including LTPS A/D Converter

New configuration of display device having image capture function suitable for LTPS TFT fabrication process is proposed. In this configuration, LTPS A/D converter integration to the glass substrate and operation to generate higher grayscale bitmap in the image processing LSI are involved.

Low‐temperature poly‐Si TFT‐LCD with an integrated analog circuit

— We have developed a 6-bit D/A converter and amplifier integrated low-temperature poly-Si TFT-LCD in which an integrated signal-line driver is driven by a 5-V power supply. We have employed a D/A converter including a new capacitor array and an original amplifier comprised of serially connected comparators to achieve high accuracy. The D/A converter performs gamma correction using upper significant bits of input data. Control signals for these circuits were generated by the integrated timing circuit. These advances in integration have been achieved for the first time using 3-μm design rule and improved LTPS TFT technologies and provide an advanced display system with lower power consumption, smaller module size, and higher durability.