Translucent reflective type liquid crystal display

• US 7,277,143 B2
• Filed: 09/20/2002
• Issued: 10/02/2007
• Est. Priority Date: 09/20/2002
• Status: Expired due to Fees

• Current Assignee: Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Inventors: Abe, Makoto, Komura, Shinichi, Itoh, Osamu, Funahata, Katsuyuki
• Primary Examiner(s): Nelms; David
• Assistant Examiner(s): CHUNG, DAVID Y
• Application Number:
  US10/522,772
• Publication Number:
  US 20050264728A1
• Time in Patent Office: 1,838 Days
• Field of Search: 349/114, 349/113
• US Class Current: 349/114
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer

Abstract

A low cost transflective type liquid crystal display is provided which can display a bright image with high contrast under both indoor and outdoor illumination environments. The liquid crystal display performing transmission type display and reflection type display, includes: a plurality of pixels surrounded on a substrate 10 by a plurality of gate electrodes 11 and a plurality of source electrodes 15 arranged perpendicularly to the gate electrodes; a switching element 19 arranged in each pixel and disposed neat at the intersection between each gate electrode and each source electrode; and a pixel electrode 16 connected to the switching element, wherein the pixel electrode is constituted of a transparent conductive layer and a conductive member 17 having a light reflection function and electrically connected to the transparent conductive layer.

Claims

1. A transflective type liquid crystal display comprising a liquid crystal layer squeezed between a pair of substrates;

a transmission display portion and a reflection display portion, said display portion comprising;

a plurality of pixels formed on one of said substrates in an area surrounded by a plurality of gate electrodes and a plurality of source electrodes arranged orthogonal to said gate electrodes;

a thin-film transistor arranged in each pixel and disposed near an intersection between each gate electrode and each source electrode; and

a pixel electrode connected to said thin-film transistor,

wherein said pixel electrode comprises a transparent conductive layer and conductive members having a light reflection function and electrically connected to said transparent conductive layer, and said conductive members are disposed on the surface of said transparent and conductive layer randomly and dispersively.

2. A transflective type liquid crystal display according to claim 1, wherein said conductive members are directly disposed on said transparent conductive layer.

3. A transflective type liquid crystal display according to claim 1, wherein in each pixel area, said reflection display portion is an area where said conductive members are disposed, and said transmission portion is an area other than said reflection display portion.

4. A transflective type liquid crystal display according to claim 1, wherein said conductive members comprise a plurality of convex or concave members;

and each of said convex or concave members has a continuously changing slope surface.

5. A transflective type liquid crystal display according to claim 1, wherein a pattern where said conductive members are arranged on the surface of said transparent conductive layer is such that a plurality of conductive members formed of convex or concave members are disposed dispersively, each of said conductive members having generally a circle, polygon, bar or string shape.

6. A transflective type liquid crystal display according to claim 5, wherein a pattern of said circles, polygons, bars and strings is a phase separation pattern realized by high polymer block copolymer.

7. A transflective type liquid crystal display according to claim 1, wherein said conductive members are dispersively disposed on all area of a specified area of said transparent conductive layer.

8. A transflective type liquid crystal display according to claim 1, wherein a common electrode is disposed on the other of said pair of substrates.

9. A transflective type liquid crystal display performing transmission type display and reflection type display in each pixel, wherein:

a pixel electrode disposed in each pixel is constituted of a transparent conductive layer and conductive members having a light reflection function and electrically connected to said transparent conductive layer;

said conductive members comprise a plurality of-convex or concave members;

said conductive members are directly disposed on said transparent conductive layer; and

said convex or concave members are made of conductive material mainly consisting of fine particles of silver or gold having a nano order diameter.

10. A transflective type liquid crystal display performing transmission type display and reflection type display in each pixel, wherein:

a pixel electrode disposed in each pixel comprises a flat plate type transparent conductive layer and conductive members having a light reflection function;

said conductive members comprise a plurality of convex or concave members;

said conductive members are directly disposed on said transparent conductive layer; and

said convex or concave members are made of conductive material mainly consisting of fine particles of silver or gold having a nano order diameter.