9.4L: Late-News Paper: Color Filter on TFT Array Structure Without the Use of Photolithography Process in Upper Substrate & Organic Insulator in TFT Substrate

Abstract

The COT (Color Filter on TFT Array) Structure without the use of organic insulator in TFT substrate and photolithography process in upper substrate was developed. Cost reduction and enhancement of light efficiency could be achieved by adopting inorganic insulator, SiNx, instead of thick organic layer. Through photolithography-free structure in upper substrate where bare glass is used as upper unit in cell process, we could simplify manufacturing steps and realize margin free COT in cell assembly. To embody this COT configuration, firstly the outer region of display area was re-designed to prevent light leakage that occurs in the borderline between panel and mechanical parts. Secondly, low temperature CVD (Chemical Vapor Deposition) process that can guarantee adhesion stability between SiNx and CF (Color Filter) layer was also developed. And finally, novel cell assembly method for using bare glass as the upper substrate was adopted.

Enhanced thin-film transistor driven high-aperture in-plane switching liquid crystal displays without common line and black matrix

“…5 a; this means role (1) becomes unnecessary. It is difficult, however, for the CLSE structure alone to make (2), (3), and (4) unnecessary; it should be combined with other technologies such as a color filter on TFT (COT) 19 , 27 or black photo spacer (BPS) 28 , 29 . The COT structure moves the color filter (CF) and black matrix (BM) from the upper substrate to the TFT substrate.…”

39.3: The LCD Technology Development and Application with an Improved Black Photo Spacer Structure

“…With the development of color filter on array (COA) technology, curved and flat display technology ushers in its new stage [1][2]. This technology provides simplified process, improved aperture ratio (AR) and reduced production cost [3]. Nevertheless, the normal COA technology has the risk of backlight leakage when the array and color filter (CF) glass substrates are misalignment [4].…”