Liquid crystal display device equipped with built-in touch panel having a narrow flexible wiring substrate

Patent metadata

Field	Value
Publication number	US-9703134-B2
Application number	US-201414147710-A
Country	US
Kind code	B2
Filing date	Jan 6, 2014
Priority date	Jan 10, 2013
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A liquid crystal display device equipped with a built-in touch panel includes a second substrate on which a wiring pattern for configuring a touch panel is formed, and a flexible wiring substrate joined to the second substrate with an overlap portion, and electrically connected to the wiring pattern. The flexible wiring substrate is formed of a multilayer substrate having a first conductive pattern layer having a plurality of terminal portions electrically connected onto the wiring pattern, a second conductive pattern layer, an insulating layer interposed between the first conductive pattern layer and the second conductive pattern layer, and a plurality of contact portions that penetrates through the insulating layer, and electrically connects the plurality of terminal portions to the second conductive pattern layer. The plurality of contact portions is arranged to overlap with the plurality of terminal portions.

First claim

What is claimed is:

1. A liquid crystal display device equipped with a built-in touch panel, comprising:
a first substrate on which a circuit layer for driving a liquid crystal material is formed;
a second substrate on which a wiring pattern for configuring a touch panel is formed; and
a flexible wiring substrate joined to have a portion overlapped with the second substrate, and electrically connected to the wiring pattern,
wherein the flexible wiring substrate is formed of a multilayer substrate having a first conductive pattern layer having a plurality of terminal portions overlapping with and electrically connected onto the wiring pattern, a second conductive pattern layer, an insulating layer interposed between the first conductive pattern layer and the second conductive pattern layer, and a plurality of contact portions that penetrates through the insulating layer and electrically connects the plurality of terminal portions to the second conductive pattern layer,
wherein the plurality of contact portions are arranged to overlap with the plurality of terminal portions and the wiring pattern,
wherein the flexible wiring substrate includes an overlap portion overlapped with the second substrate, and a leading portion that protrudes from at least one of both ends of the overlap portion orthogonal to a length direction of the overlap portion with the avoidance of an intermediate portion thereof,
wherein the overlap portion overlaps in the length direction with one side of the second substrate oriented in a longitudinal direction orthogonal to the length direction, wherein the one side is extended in a lateral direction,
wherein the length direction of the overlap portion and the lateral direction of the one side match each other,
wherein the plurality of terminal portions are configured as a plurality of groups each having two or more adjacent terminal portions,
wherein the first conductive pattern layer has connection portions that electrically connect the two or more adjacent terminal portions in each group of the plurality of groups,
wherein the plurality of terminal portions are each shaped to extend greater in a width direction orthogonal to the length of the overlap portion than in other directions,
wherein the connection portion is shaped to extend in the length direction of the overlap portion,
wherein the adjacent two or more terminal portions configuring each of the groups, and the connection portion are shaped to intersect with each other with shared intersection portions, and
wherein the two or more adjacent terminal portions in each group of the plurality of groups have a land portion at an intersection point between one of the terminal portions and the connection portion, and are electrically connected to the second conductive pattern layer by one of the contact portions disposed on the land portion.

2. The liquid crystal display device equipped with a built-in touch panel according to claim 1 ,
wherein the leading portion protrudes from one of the both ends of the overlap portion in the length direction thereof.

3. The liquid crystal display device equipped with a built-in touch panel according to claim 1 ,
wherein the leading portion protrudes from each of the both ends of the overlap portion in the length direction, and
wherein the flexible wiring substrate further includes a coupling portion that couples the leading portions protruding from the both ends of the overlap portion with being spaced from the overlap portion, and a space is formed between the overlap portion and the coupling portion.

4. The liquid crystal display device equipped with a built-in touch panel according to claim 1 ,
wherein the first conductive pattern layer includes a dummy terminal that does not establish electrical continuity with the connection portion between the terminal portions of adjacent groups.

5. The liquid crystal display device equipped with a built-in touch panel according to claim 1 ,
wherein the connection portion is located in a center of the overlap portion in the width direction.

6. The liquid crystal display device equipped with a built-in touch panel according to claim 1 ,
wherein a plurality of the connection portions electrically connected to the respective terminal portions of the plurality of groups are displaced from one side of both sides of the overlap portion in the width direction to an other side of the both sides in an arrangement sequence of the terminal portions of the plurality of groups.

7. The liquid crystal display device equipped with a built-in touch panel according to claim 6 ,
wherein the plurality of connection portions electrically connected to the respective terminal portions of the plurality of groups are located at positions displaced from a center of the overlap portion in the width direction to either side of the both sides of the overlap portion in the width direction.

8. The liquid crystal display device equipped with a built-in touch panel according to claim 1 ,
wherein each group of the plurality of groups includes three or more terminal portions, and
wherein the land portion is disposed on a terminal portion except for both endmost terminal portions in an arrangement direction of three or more terminal portions.

9. The liquid crystal display device equipped with a built-in touch panel according to claim 1 ,
wherein each group of the plurality of groups includes three or more terminal portions, and
wherein the land portion is disposed on an endmost terminal portion in an arrangement direction of the three or more terminal portions.

10. The liquid crystal display device equipped with a built-in touch panel according to claim 1 ,
wherein an outer diameter of the respective contact portions is larger than widths of the terminal portions and the connection portion.

11. The liquid crystal display device equipped with a built-in touch panel according to claim 1 ,
wherein the overlap portion of the flexible wiring substrate includes a crimped portion joined to the second substrate by crimping, and an uncrimped portion overlapped with the second substrate with the avoidance of crimping, and
wherein the plurality of the contact portions are arranged in the uncrimped portion.

12. The liquid crystal display device equipped with a built-in touch panel according to claim 11 ,
wherein the end of the second substrate joined to the flexible wiring substrate includes an outward portion of a leading end side in the longitudinal direction, and an inward portion on a center side of the second substrate from the leading end, and
wherein the crimped portion is joined to the outward portion and,
wherein the uncrimped portion is overlapped with the inward portion.

13. The liquid crystal display device equipped with a built-in touch panel according to claim 12 ,
wherein the second conductive pattern layer has a planar pattern formed to avoid a contact with the plurality of second wires, and
wherein the planar pattern is formed to overlap with the crimped portion with the avoidance of overlapping with the uncrimped portion.

14. The liquid crystal display device equipped with a built-in touch panel according to claim 1 ,
wherein the first conductive pattern layer includes a plurality of first wires separated from the plurality of terminal portions and arranged in the leading portion,
wherein the second conductive pattern layer includes a plurality of second wires electrically connected to the plurality of contact portions, respectively, and
wherein the plurality of second wires of the second conductive pattern layer passes through the overlap portion of the flexible

Assignees

• Japan Display Inc
• Japan Dispaly Inc

Inventors

• Nakano Yasushi

Classifications

• G02F1/13452

  Conductors connecting driver circuitry and terminals of panels · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G02F1/13338 Primary

  Input devices, e.g. touch panels · CPC title

• G06F3/044

  by capacitive means · CPC title

• G06F3/0448

  Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality · CPC title