Liquid crystal display device and method of making the same

• US 20070171354A1
• Filed: 01/16/2007
• Published: 07/26/2007
• Est. Priority Date: 01/26/2006
• Status: Active Grant

• Current Assignee: NLT Technologies, Ltd.
• Original Assignee: NEC LCD Technologies Limited (NEC Corporation)
• Inventors: Yuge, Kazuyuki
• Granted Patent: US 7,903,226 B2
• Time in Patent Office: Days
• US Class Current: 349/187
• CPC Class Codes: G02F 1/133385 with cooling means, e.g. fans
• CPC Class Codes: G02F 1/1345 Conductors connecting electrodes to cell terminals
• CPC Class Codes: G02F 1/13454 Drivers integrated on the active matrix substrate G02F1/136277 takes precedence
• CPC Class Codes: H05K 1/0203 Cooling of mounted components H05K1/0272 takes precedence
• CPC Class Codes: H05K 3/361 Assembling flexible printed circuits with other printed circuits

Abstract

Disclosed are a liquid crystal display device 10 and a method of making such liquid crystal display device that improves display quality by providing heat dissipation pattern 4 for effectively dissipating heat generated by the driver ICs 2. The heat dissipation pattern 4 is formed on a glass substrate of a liquid crystal panel 1 along one side thereof so as to minimize non-uniform thermal distribution on the liquid crystal panel 1 at locations adjacent to and distant from the driver ICs 2.

Claims

1. A liquid crystal display device having a generally rectangular liquid crystal panel and a circuit board connected to the liquid crystal panel at least one side thereof, comprising:

driver ICs mounted on a glass substrate of the liquid crystal panel at a spaced relationship along the one side for driving the liquid crystal panel; and

a heat dissipation pattern formed on the glass substrate of the liquid crystal panel adjacent to the driver ICs for conducting heat generated by the driver ICs.

2. A liquid crystal display device of claim 1, wherein the heat dissipation pattern is in the form of film of a thermally conductive material.

3. A liquid crystal display device of claim 1, wherein the heat dissipation pattern is made from the same material as an array of the liquid crystal panel.

4. A liquid crystal display device of claim 1, wherein the heat dissipation pattern is made of a heat conductive electrically conductive material and a fixed potential is applied to the heat dissipation pattern.

5. A liquid crystal display device of claim 1, wherein the heat dissipation pattern is formed in such a manner to connect adjacent driver ICs.

6. A liquid crystal display device of claim 1, wherein the heat dissipation pattern is formed in such a manner to be connected to the circuit board.

7. A liquid crystal display device of claim 1, wherein the heat dissipation pattern is formed in such a manner to connect adjacent ICs and the circuit board.

8. A liquid crystal display device of claim 1, wherein wiring pattern for the driver ICs is formed by way of an insulation layer underneath the heat dissipation pattern.

9. A method of making a liquid crystal display device including a generally rectangular liquid crystal panel, driver ICs for driving the liquid crystal panel and a circuit board for carrying a driving circuit for supplying driving signals to the driver ICs, comprising the steps of:

forming an array and heat dissipation pattern on a glass substrate of the liquid crystal panel;

connecting the circuit board to at least one side of the glass substrate of the liquid crystal panel; and

mounting the driver ICs along the one side of the glass substrate of the liquid crystal panel in such a manner that the heat dissipation pattern is disposed between the adjacent driver ICs.

10. A method of making a liquid crystal display device of claim 9, wherein the heat dissipation pattern and the array of the liquid crystal panel are formed simultaneously using the same material.

11. A method of making a liquid crystal display device of claim 9, further comprising the step of conducting the heat generated by the driver ICs to the circuit board by way of the heat dissipation pattern.