Liquid crystal display apparatus having reflective layer

• US 7,482,746 B2
• Filed: 09/18/2006
• Issued: 01/27/2009
• Est. Priority Date: 03/04/2002
• Status: Expired due to Term

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Ogawa, Shinji, Inoue, Kazuhiro, Ishida, Satoshi, Yamada, Tsutomu, Yamashita, Tohru, Oda, Nobuhiko, Koma, Norio
• Primary Examiner(s): Macchiarolo; Peter
• Application Number:
  US11/522,871
• Publication Number:
  US 20070013837A1
• Time in Patent Office: 862 Days
• Field of Search: 313/504, 313/506, 313/509, 313/311, 349/114, 349/38, 349/113, 349/138
• US Class Current: 313/506
• CPC Class Codes: G02F 1/133553 Reflecting elements associated to illuminating devices G02F1/133605
• CPC Class Codes: G02F 1/133555 Transflectors

Abstract

A reflective layer for reflecting light incident from a second substrate side and transmitting through a second electrode made of ITO or the like is formed above a first substrate, a switching element provided for each pixel, and an insulating film covering the switching element, the reflective layer being insulated from the switching element. A first electrode having a work function similar to the second electrode and made of a transparent conductive material such as ITO is formed more proximate to a liquid crystal layer than is the reflective layer and is connected to the switching element. The thickness of the first electrode is set to 100 Å or less or in a range approximately from 750 Å to 1250 Å. Alternatively, the switching element maybe connected to the reflective electrode, the first electrode and the reflective electrode which are formed with an insulating film therebetween may be capacitively coupled, and the first electrode may be driven by the reflective electrode via the capacitor.

Claims

1. A light emitting display apparatus comprising an emissive element formed on a primary surface side of a substrate and having a structure of a first electrode, an emissive element layer, and a second electrode formed in that order from the substrate, wherein

a reflective layer for reflecting light incident from the emissive element layer or from the second electrode side is provided between the first electrode made of a transparent conductive material and the substrate;

the thickness of the transparent first electrode is in a range from 750 Å

to 1250 Å

;

a switch element corresponding to each pixel is provided between the reflective layer and the substrate;

the switch element comprises at least a control electrode and an active layer, wherein the active layer is electrically connected to the first electrode through an electrical connection at a contact hole; and

the reflective layer is selectively removed in a formation region of the contact hole for providing electrical connection between the active layer and the first electrode, is electrically insulated from the active layer, and is thereby insulated from the switch element.

2. A light emitting display apparatus comprising an emissive element formed on a primary surface side of a substrate and having a structure of a first electrode, an emissive element layer, and a second electrode formed in that order from the substrate, wherein

the first electrode is a transparent electrode made of a transparent conductive material;

a reflective layer for reflecting light incident from the emissive element layer or from the second electrode side is provided between the transparent electrode and the substrate;

the thickness of the transparent electrode is in a range from 1 Å

to 100 Å

;

a switch element corresponding to each pixel is provided between the reflective layer and the substrate;

the switch element comprises at least a control electrode and an active layer, wherein the active layer is electrically connected to the first electrode through an electrical connection at a contact hole; and

the reflective layer is selectively removed in a formation region of the contact hole for providing electrical connection between the active layer and the first electrode, is electrically insulated from the active layer, and is thereby insulated from the switch element.