43.4: A 4‐inch Reflective Color TFT‐LCD Using a Plastic Substrate

Abstract

We have developed a reflective type color TFT‐LCD using a novel plastic substrate. The display area is 4‐inch diagonal with 240×RGB×240 pixels (85ppi). This is the first report of a flat panel display driven by TFT array on a plastic substrate with PDA size and resolution. It shows that our development has stepped near to a mass production of the plastic TFT‐LCDs.

Plastic‐film displays with NanoBlock IC drivers integrated by a fluidic self‐assembly process

“…To date, most approaches to forming film-based active-matrix arrays borrow from process technologies developed for forming integrated circuits (ICs) on rigid substrates, and modify these processes for film. Relevant examples include the low-temperature formation of a-Si TFT circuits on plastic film, 13,14 MIM diode arrays on plastic film, 15,16 laser-recrystallized p-Si TFTs on plastic film, 17 a-Si TFTs on stainless-steel foil, 18,19 and p-Si TFTs on stainless steel. 20 An increasing amount of attention is also being given to organic electronics, with examples of displays based on organic TFT arrays having been demonstrated by several groups.…”

Room temperature crystallization by RF plasma

“…Such thermal processes are not desirable because plastic substrates have more than ten times larger thermal expansion coefficient (50-70 ppm/°C) than that of glass substrate (ca. 5 ppm/°C), a difference which is one cause of the problems in fine-patterned devices [4].…”

21.3: Flexible Color AM‐OLED Display Fabricated Using Surface Free Technology by Laser Ablation/Annealing (SUFTLA®) and Ink‐jet Printing Technology

“…Considerable interest has been shown toward the development of a thin, lightweight, flexible and shock-resistant display device fabricated on a plastic substrate. Liquid crystal displays (LCD) [1,2], electro-phoretic displays (EPD) [3], and organic lightemitting diode (OLED) displays [4] are among the types of display device that have been achieved on plastic substrates. Looking back over the history of the LCD development, active electronic elements such as thin film transistors (TFTs) or metaloxide-metal thin film diodes (MIM-TFDs) have been playing an important role in order to achieve good image quality.…”

“…Low-temperature poly-Si TFTs (LTPS-TFTs) can be fabricated directly onto a plastic substrate [11] if the maximum process temperature is drastically reduced, to below the allowable temperature of the plastic material. In this latter technology, however, the dimensional instability of the plastic substrate due to thermal expansion and/or moisture absorption causes some difficulties in strict alignment during photolithography [1,9].…”