Electro-optical device, wiring substrate, and electronic apparatus

• US 7,439,943 B2
• Filed: 04/18/2007
• Issued: 10/21/2008
• Est. Priority Date: 07/18/2002
• Status: Expired due to Term

• Current Assignee: Intellectual Keystone Technology LLC
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Nakanishi, Hayato
• Primary Examiner(s): Tran; Henry N
• Application Number:
  US11/785,530
• Publication Number:
  US 20070187692A1
• Time in Patent Office: 552 Days
• Field of Search: 345/36, 345/55, 345/76, 345/80, 345/83, 345/87, 345/92, 345/211, 345/214, 349139-149, 257/81, 257/99, 257/207, 257/208, 315/169.3, 313/500, 313504-506
• US Class Current: 345/80
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2320/0223 Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
• CPC Class Codes: G09G 2330/025 Reduction of instantaneous peaks of current
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 5/02 characterised by the way in which colour is displayed details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607
• CPC Class Codes: H10K 50/826 Multilayers, e.g. opaque multilayers
• CPC Class Codes: H10K 50/865 comprising light absorbing layers, e.g. light-blocking layers
• CPC Class Codes: H10K 59/1201 Manufacture or treatment
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/1315 comprising structures specially adapted for lowering the resistance
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/88 Dummy elements, i.e. elements having non-functional features

Abstract

The invention provides an electro-optical device in which a voltage drop due to the wiring resistance of a cathode is reduced and therefore steady image signals are transmitted such that erroneous image display, such as low contrast, is reduced or prevented. The invention also provides an electronic apparatus including such an electro-optical device. An electro-optical device includes red, green, and blue luminescent power-supply lines to apply currents to light-emitting elements arranged in an actual display region in a matrix; and a cathode line disposed between the light-emitting elements and a cathode. The cathode line has a width larger than a width of red, green, and blue luminescent power-supply lines.

Claims

1. An electro-optical device, comprising:

a substrate;

first electrodes disposed in an effective region on the substrate;

a second electrode commonly formed to oppose the first electrodes;

electro-optical elements, each of the electro-optical elements being interposed between the opposing one of the first electrodes and the second electrode;

a first wiring line electrically coupled to at least one of the first electrodes; and

a second wiring line coupled to the second electrode,

the first wiring line including a first portion and a second portion, the first portion being disposed between the substrate and the second portion.

2. The electro-optical device as set forth in claim 1, the first portion and second portion being formed in an overlapping position in a plan view.

3. The electro-optical device as set forth in claim 1, further comprising:

an insulating layer being formed between the first portion and the second portion, the first portion and second portion being electrically coupled through at least one contact hole in the insulating layer.

4. The electro-optical device as set forth in claim 1, the first portion and the second portion being spaced apart by a distance in the approximate range of 0.6 to 1.0 μ

m.