DISPLAY DEVICE

• US 20100033443A1
• Filed: 08/04/2009
• Published: 02/11/2010
• Est. Priority Date: 08/06/2008
• Status: Active Grant

• Current Assignee: Paneltouch Technologies LLC (Touch Display LLC)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Inventors: HASHIMOTO, Shinya
• Granted Patent: US 8,564,550 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G06F 1/16 Constructional details or arrangements
• CPC Class Codes: G06F 2203/04102 Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• 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 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: H05K 1/0216 Reduction of cross-talk, noise or electromagnetic interference grounding H05K1/0215
• CPC Class Codes: H05K 1/11 Printed elements for providing electric connections to or between printed circuits
• CPC Class Codes: H05K 1/118 specially for flexible printed circuits, e.g. using folded portions
• CPC Class Codes: H05K 2201/09245 Crossing layout
• CPC Class Codes: H05K 2201/09254 Branched layout
• CPC Class Codes: H05K 3/361 Assembling flexible printed circuits with other printed circuits

Abstract

A display device having a highly reliable electrostatic capacitive type touch panel which allows finger touch inputting and possesses excellent detection sensitivity is provided. With respect to X electrodes and Y electrodes which are formed on an electrostatic capacitive type touch panel, either one of the X electrodes and the Y electrodes is divided corresponding to a ratio between the number of X electrodes and the number of Y electrodes, and a floating electrode is formed in gaps formed along with the reduction of area of the electrode thus adjusting the area of the electrode. Due to the contraction of the area of the individual electrode, a noise level can be lowered more compared to lowering of a signal level and hence, an S/N ratio can be increased thus enhancing the detection sensitivity. Further, a line is branched on a flexible printed circuit board, intersecting lines are formed on a back surface of the flexible printed circuit board, and the intersecting lines are arranged to orthogonally intersect with lines formed on a front surface of the flexible printed circuit board thus lowering line capacitance.

Claims

1. A display device comprising:

a display panel;

an electrostatic capacitive type touch panel which is formed in an overlapping manner with the display panel;

a plurality of X electrodes and a plurality of Y electrodes intersecting with the X electrodes which are formed on the electrostatic capacitive type touch panel, each X electrode having intersecting portions where the X electrode and the Y electrode overlap with each other and electrode portions each of which is formed between two intersecting portions, and each Y electrode having intersecting portions where the X electrode and the Y electrode overlap with each other and electrode portions each of which is formed between two intersecting portions;

a first signal line which supplies signals to the X electrodes from both ends of said each X electrode;

a second signal line which supplies signals to the Y electrodes from both ends of said each Y electrode; and

a flexible printed circuit board on which the first signal line and the second signal line are formed, wherein

the first signal line and the second signal line intersect with each other on the flexible printed circuit board, and the first signal line and the second signal line are respectively branched into a plurality of paths on the flexible printed circuit board.

2. A display device according to claim 1, wherein a dummy electrode is formed adjacent to the electrode portion of said each X electrode or the electrode portion of said each Y electrode.

3. A display device according to claim 1, wherein either one of the X electrode and the Y electrode is formed of a transparent conductive film.

4. A display device according to claim 1, wherein the X electrode and the Y electrode are transparent conductive films which are formed with an insulation film sandwiched therebetween.

5. A display device according to claim 1, wherein the X electrode and the Y electrode are transparent conductive films which are formed with an insulation film sandwiched therebetween, and a dummy electrode which is formed adjacent to the each X electrode or said each Y electrode is a transparent conductive formed on the same layer as the electrode portion.

6. A display device comprising:

a display panel having long sides and short sides;

an electrostatic capacitive type touch panel which is adhered to the display panel;

a plurality of X electrodes and a plurality of Y electrodes intersecting with the X electrodes which are formed on the electrostatic capacitive type touch panel, each X electrode having intersecting portions where the X electrode and the Y electrode overlap with each other and individual electrodes each of which is formed between two intersecting portions and has a width wider than a width of the intersecting portion, and each Y electrode having intersecting portions where the X electrode and the Y electrode overlap with each other and individual electrodes each of which is formed between two intersecting portions and has a width wider than a width of the intersecting portion;

a first line and a third line which supply signals to the X electrodes;

a second line and a fourth line which supply signals to the Y electrodes; and

a flexible printed circuit board on which the first, second, third and fourth lines are formed, wherein

the X electrodes are formed along the long sides of the touch panel, one-end portions of the first and third lines are respectively connected with the X electrodes on both short-side end portions of the touch panel, and another end portions of the first and third lines are connected with each other on the flexible printed circuit board; and

the Y electrodes are formed along the short sides of the touch panel, one-end portions of the second and fourth lines are respectively connected with the Y electrodes on both long-side end portions of the touch panel, and another end portions of the second and fourth lines are connected with each other on the flexible printed circuit board.

7. A display device according to claim 6, wherein a dummy electrode is formed adjacent to the individual electrode of said each X electrode.

8. A display device according to claim 6, wherein either one of the X electrode and the Y electrode is formed of a transparent conductive film.

9. A display device according to claim 6, wherein the X electrode and the Y electrode are transparent conductive films which are formed with an insulation film sandwiched therebetween.

10. A display device according to claim 7, wherein the X electrode and the Y electrode are transparent conductive films which are formed with an insulation film sandwiched therebetween, and a dummy electrode which is formed adjacent to the each X electrode or said each Y electrode is a transparent conductive film formed on the same layer as the electrode portion.

11. A display device comprising:

a display panel;

an electrostatic capacitive type touch panel which is mounted on the display panel;

a plurality of X electrodes and a plurality of Y electrodes intersecting with the X electrodes which are formed on the electrostatic capacitive type touch panel, each X electrode having intersecting portions where the X electrode and the Y electrode overlap with each other and individual electrodes each of which is formed between two intersecting portions and has a width wider than a width of the intersecting portion, and each Y electrode having intersecting portions where the X electrode and the Y electrode overlap with each other and individual electrodes each of which is formed between two intersecting portions and has a width wider than a width of the intersecting portion;

a first line which supplies signals to the X electrodes;

a second line which supplies signals to the Y electrodes; and

a flexible printed circuit board on which the first and second lines are formed, wherein

the flexible printed circuit board includes external-device-side input/output terminals and electrostatic capacitive type touch panel side input/output terminals;

the number of electrostatic capacitive type touch panel side input/output terminals is larger than the number of external device side input/output terminals,

a transparent conductive film is provided between the display panel and the electrostatic capacitive type touch panel, and

the transparent conductive film is connected to a constant voltage power source.

12. A display device according to claim 11, wherein a dummy electrode having a floating potential is formed adjacent to the individual electrode of said each X electrode.

13. A display device according to claim 11, wherein either one of the X electrode and the Y electrode is formed of a transparent conductive film.

14. A display device according to claim 11, wherein the X electrode and the Y electrode are transparent conductive films which are formed with an insulation film sandwiched therebetween.

15. A display device according to claim 12, wherein the X electrode and the Y electrode are transparent conductive films which are formed with an insulation film sandwiched therebetween, and a dummy electrode which is formed adjacent to the each X electrode or said each Y electrode is a transparent conductive film formed on the same layer as the electrode portion.