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Browse Prior Art Database

High Efficiency Back Light for Lcd

IP.com Disclosure Number: IPCOM000119646D
Original Publication Date: 1991-Feb-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Suzuki, H: AUTHOR [+2]

Abstract

Disclosed is a technique for a high efficiency back light system. This technique is widely applicable to all types of liquid crystal displays (LCDs).

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This is the abbreviated version, containing approximately 100% of the total text.

High Efficiency Back Light for Lcd

      Disclosed is a technique for a high efficiency back light
system.  This technique is widely applicable to all types of liquid
crystal displays (LCDs).

      To achieve high efficiency back light, as shown in Fig. 1, the
structure disclosed herein uses a micro-prism-plate, edge
lighting-type light guide and thin light scattering film in
combination.  Fig. 2 shows a structure of the micro-prism-plate.
Emitted light from the surface of the light guide has an angle
perpendicular to the surface.  This light beam deflects to normal
direction to the surface by the micro-prism plate.  The light
scattering film is employed to eliminate interference pattern of the
micro-prism-plate and LCD's pixel arrangement pattern as shown Fig.
3.

      With this technique, emitted light from the back light system
has strong intensity distribution to the normal direction to the back
light surface as shown in Fig. 4.

      Liquid crystal display's application is mostly portable area.
This requires low power consumption.  Most of the power of the LCD
module is consumed at back light system. Therefore, the technique
disclosed herein is a very effective means to achieve a low power
consumption LCD module.