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

Abstract

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.

In‐cell capacitive‐type touch sensor using LTPS TFT‐LCD technology

“…1,2 LCDs having a resolution of more than 300 ppi which is beyond human-eye resolution have been achieved by using LTPS TFTs and driver-integration technologies. 3 Further integration of display circuits such as a D/A converter 4 and SRAM in a pixel with serial interface circuit embedded in the frame area 5,6 have been reported with expectations to expand the application field of LTPS TFT-LCDs. In addition, papers in the literature have reported technologies that incorporate additional functions into LCDs by integrating sensors with an ambient-light-sensing function, image-capturing function, pen/finger input function, and even a 3-D input function.…”

48.2: Display Architecture Suitable for Multiple Ambient Light‐Sensor Integration Using LTPS Technology

“…Along with recent advances and developments of circuit integration technology, low temperature polysilicon (LTPS) TFT technology of forming a part of display circuits on the glass substrate has been put into practical use [1]. Based on this technique, display devices can be made thin, compact and durable, which have been widely used for various kinds of portable instruments such as mobile phones, PDAs and mobile personal computers [2][3][4]. A technique of forming an optical sensor using LTPS TFT fabrication process has been developed intended to incorporate functions, such as a touch panel function and a pen-input function, into a display without any additional device on or behind the display (Input Display) [5][6][7].…”

Value‐added integration of functions for silicon‐on‐glass (SOG) based on LTPS technologies

“…In fact, the integration level has been progressing from simple digital circuits to sophisticated circuits ones such as digitalto-analog converters (DACs), timing controllers, memories, etc. [3][4][5][6][7] Moreover, SOG technology also has the potential of integrating the input function as well as the output function of a display, which will pave the way for advanced future displays. A key device for functional integration is a poly-Si photo-sensor system which can be applied to almost all possible applications, and it is desirable that the photo-sensor has a common manufacturing process with the conventional TFT array.…”