CONTACT PAD FOR THIN FILM TRANSISTOR SUBSTRATE AND LIQUID CRYSTAL DISPLAY

• US 20070236624A1
• Filed: 04/11/2007
• Published: 10/11/2007
• Est. Priority Date: 08/29/2006
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: Her, Yong Koo, Uh, Kee Han, Park, Yong Han, Shin, Ae
• Granted Patent: US 7,700,952 B2
• Time in Patent Office: Days
• US Class Current: 349/42
• CPC Class Codes: G02F 1/1345 Conductors connecting electrodes to cell terminals
• CPC Class Codes: H01L 27/12 the substrate being other than a semiconductor body, e.g. an insulating body
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52

Abstract

A contact pad is disclosed including a first electrode pattern with an open portion inside, an insulation layer formed on the first electrode pattern and having a contact via portion formed therein, and a second electrode pattern formed on the insulation layer and electrically connected to the first electrode pattern through the contact via portion. The second electrode pattern comprises single electrode patterns spaced apart from one another. A thin film transistor substrate and a liquid crystal display panel having the contact pad are also disclosed.

Claims

1. A contact pad comprising:

a first electrode pattern with an open portion inside;

an insulation layer formed on the first electrode pattern and having a contact via portion formed therein; and

a second electrode pattern formed on the insulation layer and electrically connected to the first electrode pattern through the contact via portion,

wherein the second electrode pattern comprises a plurality of single electrode patterns arranged to be spaced apart from one another.

2. The contact pad as claimed in claim 1, wherein the first and second electrode patterns are made of a conductive material.

3. The contact pad as claimed in claim 1, wherein the open portion comprises a plurality of openings, and the openings are spaced apart from one another at a predetermined interval.

4. The contact pad as claimed in claim 3, wherein the first electrode pattern is formed as a lattice.

5. The contact pad as claimed in claim 1, wherein the contact via portion comprises a plurality of contact vias, and the contact vias are spaced apart from one another at a predetermined interval.

6. The contact pad as claimed in claim 5, wherein the number and positions of the single electrode patterns correspond to those of the contact vias.

7. A thin film transistor substrate, comprising:

a substrate;

a plurality of gate lines formed in one direction on the substrate;

a plurality of data lines intersecting the plurality of gate lines while being insulated therefrom;

a plurality of single pixels formed at intersections of the plurality of gate and data lines; and

a contact pad formed in a peripheral region of the substrate,

wherein the contact pad comprises a first electrode pattern with an open portion inside, an insulation layer formed on the first electrode pattern and having a contact via portion formed therein, and a second electrode pattern formed on the insulation layer and electrically connected to the first electrode pattern through the contact via portion; and

the second electrode pattern comprises a plurality of single electrode patterns spaced apart from one another.

8. The thin film transistor substrate as claimed in claim 7, wherein each of the single pixels comprises a thin film transistor having gate and source-drain electrodes respectively connected to corresponding gate and data lines, and a pixel electrode connected to the thin film transistor.

9. The thin film transistor substrate as claimed in claim 8, wherein the first electrode pattern is made of the same material as the gate or data line.

10. The thin film transistor substrate as claimed in claim 8, wherein the second electrode pattern is made of the same material as the pixel electrode.

11. A liquid crystal display panel, comprising:

a thin film transistor substrate including a first substrate, a plurality of single pixels formed on the first substrate to have a plurality of thin film transistors and pixel electrodes, and a contact pad formed in a peripheral region of the first substrate;

a color filter substrate including a second substrate, a plurality of color filters formed on the second substrate, and a common electrode formed on the plurality of color filters; and

a conductive contact for electrically connecting the contact pad and the common electrode,

wherein the contact pad comprises a first electrode pattern with an open portion inside, an insulation layer formed on the first electrode pattern and having a contact via portion formed therein, and a second electrode pattern formed on the insulation layer and electrically connected to the first electrode pattern through the contact via portion; and

the second electrode pattern comprises a plurality of single electrode patterns spaced apart from one another.

12. The liquid crystal display panel as claimed in claim 11, wherein the conductive contact is formed to be electrically connected to at least a portion of the second electrode pattern.

13. The liquid crystal display panel as claimed in claim 11, wherein the conductive contact is made of a conductive silver paste or a mixture of a resin and a spacer coated with a conductive material.