Display device with capacitive touch sensor with slit formed in a surface of a detecting electrode opposed to a scanning electrode to realize detection with high accuracy

• US 10,025,425 B2
• Filed: 04/04/2017
• Issued: 07/17/2018
• Est. Priority Date: 04/20/2009
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Nakanishi, Takayuki, Noguchi, Koji, Ishizaki, Koji, Teranishi, Yasuyuki, Takeuchi, Takeya
• Primary Examiner(s): Kumar, Srilakshmi K
• Assistant Examiner(s): KIYABU, KARIN A
• Application Number:
  US15/478,919
• Publication Number:
  US 20170205950A1
• Time in Patent Office: 469 Days
• Field of Search: None
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G02F 2201/123 pixel
• CPC Class Codes: G02F 2203/01 transmissive
• CPC Class Codes: G06F 2203/04101 2.5D-digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04108 Touchless 2D- digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface without distance measurement in the Z direction
• 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 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• 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: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 5/18 Timing circuits for raster scan displays specially adapted for television H04N ; synchronisation between the display unit and other display units, videodisc player G09G5/12

Abstract

An information input device including a touch panel configured to be provided with a touch sensor that detects a position at which a sensing object is brought close to a sensing surface. In this information input device, the touch sensor has a scanning electrode and a detecting electrode that is opposed to the scanning electrode with the intermediary of a dielectric substance, and is a capacitive sensor whose electrostatic capacitance changes if the sensing object is brought close to the detecting electrode. Furthermore, a slit is formed in a surface of the detecting electrode opposed to the scanning electrode.

Claims

1. An information input device comprising:

a plurality of scanning electrodes extending along a first direction;

a plurality of detecting electrodes opposing the scanning electrodes and extending along a second direction crossing the first direction;

a dielectric substance between the scanning electrodes and the detecting electrodes; and

a plurality of slits formed within each of the detecting electrodes, the slits including a first slit, a second slit next to the first slit in the first direction, and a third slit next to the first slit in the second direction,

wherein

the first, second, and third slits are identical in size and shape, and each has a first end and a second end that are separated in the second direction,

for each detecting electrode, the first, second, and third slits are in a portion of the detecting electrode that overlaps the scanning electrodes, and

in the second direction, the first end of the second slit is located between the first end and second end of the first slit, and the second end of the second slit is located between the first end and second end of the third slit.

2. The information input device according to claim 1, wherein each of the detecting electrodes is a transparent electrode that transmits visible light.

3. The information input device according to claim 1, wherein each of the detecting electrodes has a side extending along a direction different from the first and second directions.

4. The information input device according to claim 1, wherein each of the slits is polygonal and has more than four sides.

5. The information input device according to claim 1, wherein each of the slits has a rhombic shape.

17. The information input device according to claim 1, wherein the first slit and the second slit are alternately arranged in the first direction, and the third slit and the second slit are alternately arranged in the first direction.

6. A display device comprising a display panel having a touch sensor that detects a position to which a sensing object is in proximity with respect to a display surface, the touch sensor including:

a plurality of scanning electrodes extending along a first direction;

a plurality of detecting electrodes opposing the scanning electrodes and extending along a second direction crossing the first direction;

a dielectric substance between the scanning electrodes and the detecting electrodes; and

a plurality of slits formed within each of the detecting electrodes, the slits including a first slit, a second slit next to the first slit in the first direction, and a third slit next to the first slit in the second direction,

wherein

the first, second, and third slits are identical in size and shape, and each has a first end and a second end that are separated in the second direction,

for each detecting electrode, the first, second, and third slits are in a portion of the detecting electrode that overlaps the scanning electrodes, and

in the second direction, the first end of the second slit is located between the first end and second end of the first slit, and the second end of the second slit is located between the first end and second end of the third slit.

7. The display device according to claim 6, wherein the display panel is a liquid crystal panel that includes a first substrate, a second substrate opposing the first substrate, and a liquid crystal layer provided between the first substrate and the second substrate.

8. The display device according to claim 7, wherein:

the detecting electrodes are provided on a surface of the first substrate on an opposite side to a surface of the first substrate opposing the second substrate; and

the scanning electrodes are provided between the first substrate and the second substrate in such a manner as to be opposed to the detecting electrodes with the first substrate between the detecting electrodes and the scanning electrodes.

9. The display device according to claim 6, wherein:

the display panel includes (a) a plurality of pixel electrodes arranged in a display area, and (b) a common electrode provided at an interval from the pixel electrodes in the display area; and

the scanning electrodes are used as the common electrode.

10. The display device according to claim 6, wherein each of the detecting electrodes has a side extending along a direction different from the first and second directions.

11. The display device according to claim 6, wherein each of the slits is polygonal and has more than four sides.

12. The display device according to claim 6, wherein each of the slits has a rhombic shape.

13. A display device comprising a display panel having a touch sensor that detects a position to which a sensing object is in proximity with respect to a display surface, the touch sensor including:

a plurality of scanning electrodes extending along a first direction;

a plurality of detecting electrodes opposing the display surface and extending along a second direction crossing the first direction; and

a plurality of slits formed within each of the detecting electrodes, the slits including a first slit, a second slit next to the first slit in the first direction, and a third slit next to the first slit in the second direction,

wherein

the first, second, and third slits are identical in size and shape, and each has a first end and a second end that are separated in the second direction,

for each detecting electrode, the first, second, and third slits are in a portion of the detecting electrode that overlaps the scanning electrodes, and

in the second direction, the first end of the second slit is located between the first end and second end of the first slit, and the second end of the second slit is located between the first end and second end of the third slit.

14. The display device according to claim 13, wherein each of the detecting electrodes has a side extending along a direction different from the first and second directions.

15. The display device according to claim 13, wherein each of the slits is polygonal and has more than four sides.

16. The display device according to claim 13, wherein each of the slits has a rhombic shape.