48.4: Ink Jet Fabrication of Alignment Layers on High-Temperature Polysilicon Liquid Crystal Panels

Abstract

Inkjet technology was used in a mass production process to form an alignment layer on high-temperature polysilicon TFT liquid crystal panels used in LCD projectors. This is the first-ever inkjet process for forming alignment layers in an LCD manufacturing process.Surface treatment, inkjet ejection, and post-print drying processes were integrated, and process conditions and printing materials were optimized, thereby sharply improving display quality while reducing process environmental impact.

Materials and Applications for Large Area Electronics: Solution-Based Approaches

“…In the case of large area AMLCD, these efforts have focused on non-TFT materials such as color filter processing, polyimide deposition, and other areas. 23,24 In new display types, such as AMOLED (active matrix organic light-emitting diode) displays, where the novel emitter materials cost can be very high, the potential benefits of local deposition techniques has driven considerable development by Epson, 25,26 Philips, 7 Cambridge Display Technology, 27 Dupont, 28 3M, 29 Samsung, 30 Sony, 31 and others. However, there still exists a fundamental gap between the error rates and reliability issues obtained with very high accuracy print deposition and the stringent requirements of high yield displays processing (<1 ppm).…”

“…There has been growing interest in novel approaches to materials deposition to increase efficiency at larger substrate areas. In the case of large area AMLCD, these efforts have focused on non-TFT materials such as color filter processing, polyimide deposition, and other areas. , …”

Liquid crystal alignment on inkjet printed and air-buffed polyimide with nano-grove surface

“…In the case of printing the alignment layer, inkjet printing technology has recently been tailored for printing alignment layers in the fabrication of an LC display due to advantages such as high resolution, high speed, mask-free, low cost, non-contact and environmentally friendly nature [1]. On the other hand, LC alignment using non-rubbing methods such as traditional oblique deposition [2], ultraviolet (UV) exposure [3,4], ion beam exposure [5,6] and the µ-rubbing method [7] is the subject of intensive studies.…”