LCD (liquid crystal display) with a back light source characterized by light source local penetration

• US 20040046730A1
• Filed: 08/21/2002
• Published: 03/11/2004
• Est. Priority Date: 08/21/2002
• Status: Abandoned Application

• Current Assignee: Radiant Opto-Electronics Corp.
• Original Assignee: Radiant Opto-Electronics Corp.
• Inventors: Chang, Wen-Hsiang, Liu, Yu-Bing, Miyashita, Kazuhiro, Chu, Yen-Chuan
• Application Number:
  US10/224,458
• Publication Number:
  US 20040046730A1
• Time in Patent Office: Days
• US Class Current: 345/102
• CPC Class Codes: G02B 6/0046 Tapered light guide, e.g. wedge-shaped light guide
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02F 1/133526 Lenses, e.g. microlenses or Fresnel lenses
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses
• CPC Class Codes: G02F 1/133626 providing two modes of illumination, e.g. day-night

Abstract

The invention is related to an LCD (Liquid Crystal Display) with a back light source characterized by light source local penetration. There is a reflective layer on the bottom of the LCD. The reflective layer contains some light channels. A micro lens-film is placed between the LCD and the back light source. The micro lens-film contains some light collection sections in such a way that individual light collection sections are opposite individual light channels. The invention has two merits. Firstly, the reflective layer reflects incident daylight greatly so as to help illuminate the LCD. Secondly, the light emitted by the back light source is condensed by the light collection sections before passing through the light channels, so that it helps illuminate the LCD. Not only is the LCD illuminated better, but the images it shows also have better contrast under daylight. Hence, the images displayed on the LCD screens are greatly improved.

Claims

1. A LCD with a back light source characterized by light source local penetration, comprising an LCD, a reflective layer on the bottom of the LCD, a micro-lens reflective film and a back light source, wherein the reflective layer contains a plurality of light channels found all over the layer itself, the micro lens-film contains some light collection sections in such a way that individual light collection sections are opposite individual light channels, incident daylight reflects off the reflective layer, then it is joined by the self-made light which comes from the light-guide plate and passes through the light collection sections and the light channels, the combination of the reflected daylight and the self-made light augments the illumination required by the LCD and improves the contrast of LCD screens display under daylight L4.

2. The LCD with a back light source characterized by light source local penetration of claim 1, wherein the area of individual light collection sections of the micro lens-film may be slightly greater than the area of individual light channels of the reflective layer, so as to enhance the condensing effect.