Display Device

• US 20120262886A1
• Filed: 04/09/2012
• Published: 10/18/2012
• Est. Priority Date: 04/18/2011
• Status: Abandoned Application

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: YAMAGISHI, Yasuhiko
• Application Number:
  US13/442,267
• Publication Number:
  US 20120262886A1
• Time in Patent Office: Days
• US Class Current: 361/749
• CPC Class Codes: G02F 1/13452 Conductors connecting driver circuitry and terminals of panels
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H05K 1/0268 for electrical inspection or testing
• CPC Class Codes: H05K 2201/09781 Dummy conductors, i.e. not used for normal transport of current; Dummy electrodes of components
• CPC Class Codes: H05K 2201/10128 Display
• CPC Class Codes: H05K 3/361 Assembling flexible printed circuits with other printed circuits
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals

Abstract

A wiring area on a substrate is expanded and the width of the substrate is reduced to achieve a smaller display device at lower cost. The display device includes a display panel, a circuit board, and a flexible printed circuit board connecting the display panel and the circuit board, and the circuit board and the flexible printed circuit board are electrically connected to each other via an anisotropic conductive film. Crimp contacts 15 in the mounting area of the flexible printed circuit board 11 and crimp dummy terminals 16 outside the mounting area are provided on the circuit board, and some of the crimp dummy terminals act as test terminals 18 for crimp resistance measurement, and the crimp contacts 15 and the test terminals 18 are electrically connected to each other on the circuit board.

Claims

1. A display device comprising:

a display panel;

a circuit board; and

a flexible printed circuit board connecting the display panel and the circuit board,

the flexible printed circuit board being electrically connected to at least one of substrates of the display panel and the circuit board via an anisotropic conductive film,

wherein the one of the substrates and the circuit board has a mounting area superimposed on the flexible printed circuit board,

the mounting area of the one of the substrates and the circuit board contains a plurality of first terminals, an area other than the mounting area contains second terminals unconnected to the first terminals and third terminals respectively connected to the first terminals, and

the first terminals include terminals connected to the third terminals and terminals unconnected to the third terminals.

2. The display device according to claim 1, wherein the first terminals, the second terminals, and the third terminals are arranged in a line along one side of the one of the substrates and the circuit board.

3. The display device according to claim 1, wherein the third terminal has a different shape from the second terminal.

4. The display device according to claim 1, wherein the second terminals and the third terminals are identical in shape and the third terminals are spaced at intervals different from those of the second terminals.

5. The display device according to claim 1, wherein the second terminals are disposed on both sides of the first terminals and the third terminals are disposed on an opposite side of the second terminals from the first terminals.

6. The display device according to claim 1, wherein the display panel includes a drive circuit installed by COG mounting.

7. The display device according to claim 1, wherein the flexible printed circuit board includes a drive circuit installed by COF mounting.

8. The display device according to claim 1, wherein the display panel is one of a liquid crystal display panel, an organic EL display panel, and a plasma display panel.