Liquid crystal display device with built-in touch panel

• US 9,927,900 B2
• Filed: 05/02/2017
• Issued: 03/27/2018
• Est. Priority Date: 05/01/2012
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Abe, Hiroyuki, Maki, Masahiro, Suzuki, Takayuki
• Primary Examiner(s): Nguyen, Sang V
• Application Number:
  US15/584,069
• Publication Number:
  US 20170235401A1
• Time in Patent Office: 329 Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/134318 having a patterned common electrode
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/1345 Conductors connecting electrodes to cell terminals
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

The presence or absence of touch is detected according to a difference of a capacitance caused by the presence or absence of a material that blocks the electric field formed between the detection electrode and the common electrode. The common electrode includes a plurality of divided electrode portions that is extended in a lateral direction and aligned with each other in a longitudinal direction. Each of the plurality of common lines is electrically connected to at least one of the divided electrode portions. The plurality of common lines is arranged in an area next to the common electrode in the lateral direction of the common electrode, arranged next to each other in a width direction orthogonal to a length thereof, is different in width from each other, and the width of the common lines is wider as the length is longer.

Claims

1. A display device comprising:

a substrate including a display area and a peripheral area around the display area;

a plurality of pixel electrodes to which signals are applied for displaying in the display area;

a common electrode to which another signal is applied for touch detecting and displaying in the display area, the common electrode including a plurality of divided electrodes;

a plurality of common lines formed in the peripheral area so as to be electrically connected to the common electrode, the common lines arranged in a lateral direction and each having an arranged portion;

an insulating layer formed between the common lines and the divided electrodes, the insulating layer having a connecting opening formed above an end portion of each of the plurality of common lines; and

a conductive film formed in the connecting opening and electrically connecting between each of the common lines and corresponding one of the plurality of divided electrodes,

wherein a width of the end portion is greater than a width of the arranged portion in a same one of the common lines, and

the width in the lateral direction of the end portion of a longer one of the common lines is greater than the width of a shorter one of the common lines.

2. The display device according to claim 1,

wherein each of the plurality of common lines has a longest common line and a shortest common line, and

the plurality of common lines each have the end portion displaced in the order from the longest common line to the shortest common line.

3. The display device according to claim 2,

wherein the shortest common line is arranged at a side closest to the common electrode in the lateral direction,

wherein the longest common line is arranged at a side farthest from the common electrode in the lateral direction, and

wherein the plurality of common lines each is more distant from the common electrode in the lateral direction as the common lines each is longer.

4. The display device according to claim 2,

wherein except for at least the shortest common line, the common lines each have a plurality of portions different in width.

5. The display device according to claim 1,

wherein the substrate further includes a circuit, and

wherein the plurality of common lines is formed to overlap with the circuit.

6. The display device according to claim 1,

wherein an electric field is formed between the pixel electrodes and the common electrode.

7. A display device comprising:

a substrate including a display area and a peripheral area around the display area;

a plurality of pixel electrodes to which signals are applied for displaying in the display area;

a common electrode to which another signal is applied for touch detecting and displaying in the display area, the common electrode including a plurality of divided electrodes;

a plurality of common lines formed in the peripheral area so as to be electrically connected to the common electrode, the common lines arranged in a lateral direction and each having a parallel arranged portion;

an insulation layer formed between the common lines and the divided electrodes, the insulation layer having a connecting opening formed above an end portion of each of the plurality of common lines; and

a conductive film formed in the connecting opening and electrically connecting between each of the common lines and corresponding one of the plurality of divided electrodes,

wherein a width of the end portion is greater than a width of the parallel arranged portion in same one of the common lines, and

the width in the lateral direction of the parallel arranged portion of longer one of the common lines is greater than the width of shorter one of the common lines.

8. The display device according to claim 7,

wherein each of the plurality of common lines has a longest common line to a shortest common line, and

the plurality of common lines each have the end portion displaced in the order from the longest common line to the shortest common line.

9. The display device according to claim 8,

wherein the shortest common line is arranged at a side closest to the common electrode in the lateral direction,

wherein the longest common line is arranged at a side farthest from the common electrode in the lateral direction, and

wherein the plurality of common lines is more distant from the common electrode in the lateral direction as the common lines is longer.

10. The display device according to claim 7,

wherein except for at least the shortest common line, the common lines each have a plurality of portions different in width.

11. The display device according to claim 7,

wherein the substrate further includes a circuit, and

wherein the plurality of common lines is formed to overlap with the circuit.

12. The display device according to claim 7,

wherein an electric field is formed between the pixel electrodes and the common electrode.