Tomonobu Motai

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.

28.1: Distinguished Paper: A Novel Low-Power-Consumption All-Digital System-On-Glass Display with Serial Interface

We have developed a low-power LCD panel with a serial interface by combining the technique of integration of serial data receiver function and pixel memory circuits. It has achieved a low power consumption of 15uW in a 2.26-inch format.

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.

A novel low-power-consumption all-digital system-on-glass display with serial interface

— A new conceptual ultra-compact LCD panel, which features a simple interface and lower-power consumption by using low-temperature polysilicon thin-film transistor (LTPS-TFT) technology has been developed. This panel is capable of switching operation modes based on an input command, and all the data are directly communicated with the circuit inside the panel through a Serial Peripheral Interface (SPI) protocol. The integration of the serial-data-receiver function on glass substrate has enabled the achievement of a significant reduction in the number of interface pins. Moreover, a low power consumption of 15 μW for a 2.26-in. reflective LCD panel in combination with the technique of integrating a memory circuit in each pixel has been achieved.

28.2: 3.5 Inch VGA TFT LCD with System‐On‐Glass Technology for Automotive Applications

We have developed a 3.5 inch VGA TFT LCD with Capacitively Coupled Dot Inversion (CCDI) driving for automotive applications using System-on-Glass Technology (SOG). A drastic reduction in the number of connecting points (one-tenth), low power consumption and high display quality have been achieved compared with conventional a-Si TFT LCDs.

18.4: Novel Gamma Correction Method Using an Advanced Capacitive Coupling Driving

We have developed a LCD panel for mobile-use applications that adjusting each RGB gamma characteristics independently without increasing the scale of peripheral circuit. It has been realized by using the Capacitive Coupling driving method and optimizing the storage capacitances of R, G, and B subpixels independently.