Backlighted liquid crystal display unit

• US 5,253,089 A
• Filed: 06/05/1992
• Issued: 10/12/1993
• Est. Priority Date: 11/07/1991
• Status: Expired due to Fees

• Current Assignee: ROHM Co., Ltd.
• Original Assignee: ROHM Co., Ltd.
• Inventors: Imai, Satoshi
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): MAI, HUY KIM
• Application Number:
  US07/894,095
• Time in Patent Office: 494 Days
• Field of Search: 359/42, 359/48, 359/49, 359/50
• US Class Current: 349/65
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0071 with elongated shape, e.g. tube
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side

Abstract

In a transmission-type liquid crystal display unit having an edge-type backlight in which light from a fluorescent lamp is conducted through a light-conducting plate to the rear surface of the display unit, the light-conducting plate has a light-receiving end face which is curved along the cylindrical wall of the fluorescent lamp and maintained in contact with the latter, so that the light from the fluorescent lamp is conducted to the display surface with high efficiency.

Claims

1. A backlighted liquid crystal display comprising transmission-type liquid crystal display means having opposed surfaces, a light-conducting plate adjacent to one surface of the display means made of light-conducting material and having a light-receiving portion, and light source means in direct physical contact with the light-conducting material in the light-receiving portion of the light-conducting plate in at least two contact regions.

2. An edge-type backlight arrangement for a liquid crystal display comprising light source means and a light-conducting plate made of light-conducting material for conducting light from a light-receiving portion adjacent to the light source means to a surface of a liquid crystal display wherein the light source means is in direct physical contact with the light-conducting material in the light-receiving portion of the light-conducting plate in at least two contact regions.