Browse Prior Art Database

Liquid Crystal Display

IP.com Disclosure Number: IPCOM000015419D
Original Publication Date: 2001-Nov-17
Included in the Prior Art Database: 2003-Jun-20
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Abstract

This article describes a new liquid crystal display with a thin film transistor (TFT) array and polymer on array. This display has large viewing angle using pretilt angle control technology, without extra photo process and alignment layer applying process. Figure 1-4 show cross sections of TFT array and liquid crystal cell and their processes. Figure 1. First, ITO is deposited on the substrate. Second, DLC (Diamond like carbon) is deposited. Then, ion beam (IB) is irradiated for liquid crystal alignment process. This ion beam is named is IB1. The direction of IB1 makes the pretilt angle direction of liquid crystal. Figure 2 Coat photo resist and expose it with halftone mask. Then, develop the resist. As a result, Totally-developed

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Liquid Crystal Display

This article describes a new liquid crystal display with a thin film transistor (TFT) array and polymer on array. This display has large viewing angle using pretilt angle control technology, without extra photo process and alignment layer applying process. Figure 1-4 show cross sections of TFT array and liquid crystal cell and their processes.

Figure 1. First, ITO is deposited on the substrate. Second, DLC (Diamond like carbon) is deposited. Then, ion beam (IB) is irradiated for liquid crystal alignment process. This ion beam is named is IB1. The direction of IB1 makes the pretilt
angle direction of liquid crystal.

Figure 2 Coat photo resist and expose it with halftone mask. Then, develop the resist. As a result, Totally-developed
area, half-developed area, and non-developed area are made. Next, in totally developed area, etch DLC and ITO with dry or wet method.

Figure 3. Ash resist on half-developed area. As a result, only totally developed area remains. Then, IB (IB2) is
irradiated on half-developed area in the opposite direction to IB1.

Figure 4. Strip resist and assemble liquid crystal cell with this substrate. The substrate has two different areas whose alignment directions are opposite. As a result, two domains of liquid crystal are realized. Consequently, wide viewing angle liquid crystal display is realized.

Besides, polymer surface of PFA structure with IB irradiation aligns liquid crystal as well as DLC. Therefore, we can deposit ITO...