Display device with a touch sensor

• US 10,452,193 B2
• Filed: 11/02/2018
• Issued: 10/22/2019
• Est. Priority Date: 07/24/2012
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Furutani, Naosuke, Kurasawa, Hayato, Hayashi, Makoto
• Primary Examiner(s): Pardo, Thuy N
• Application Number:
  US16/179,268
• Publication Number:
  US 20190073084A1
• Time in Patent Office: 354 Days
• Field of Search: 345156, 345173, 345174, 345211, 349 50, 349155
• CPC Class Codes: G02F 1/133302 Rigid substrates, e.g. inorganic substrates
• 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 1/133514 Colour filters
• CPC Class Codes: G02F 1/133707 Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134318 having a patterned common electrode
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• 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: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• 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 3/0445 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
• CPC Class Codes: G09G 2300/0426 : Layout of electrodes and connections
• CPC Class Codes: G09G 2330/02 : Details of power systems and of start or stop of display operation
• CPC Class Codes: G09G 3/3607 : for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127
• CPC Class Codes: G09G 3/3648 : using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A display device with a touch sensor having a display function and a touch sensor function is provided. The display device includes a first substrate including a pixel electrode; a first electrode along a first direction; and a second substrate including a second electrode that includes patterns of electrodes along a second direction crossing the first direction and that faces the first electrode and the pixel electrode, wherein upon the display function being activated, the pixel electrode is supplied with a pixel signal, and the second electrode is supplied with common voltage, and upon the touch sensor function being activated, the first electrode is applied with a first signal and the second electrode is configured to receive the first signal to be a second signal as a touch detecting signal.

Claims

1. A liquid crystal display device with a touch sensor comprising:

a first substrate including

a plurality of gate lines extending in a first direction,

a plurality of signal lines extending in a second direction intersecting the first direction,

a plurality of pixel electrodes provided in respective areas that are defined by the gate lines and the signal lines, and

a plurality of first electrodes opposed to the pixel electrodes;

a second substrate; and

a liquid crystal layer provided between the first substrate and the second substrate, wherein

upon a liquid crystal display function being activated, the first electrodes are supplied with a common voltage, and

upon a touch sensor function being activated, at least one of the first electrodes is applied with a first signal for detecting touch;

each of the first electrodes has

an overlapped portion overlapped by the signal line and

an intermediate portion between the overlapped portions,

a width of the overlapped portion in the second direction is narrower than a width of the intermediate portion in the second direction.

2. The liquid crystal display device with a touch sensor according to claim 1, wherein

a side of the intermediate portion along the second direction is tapered toward the overlapped portion.

3. The liquid crystal display device with a touch sensor according to claim 1, wherein

the intermediate portion has a first center line of the width of the intermediate portion, and

the overlapped portion has a second center line of the width of the overlapped portion, and

the first center line and the second center line are a same line extending straight in the first direction.

4. The liquid crystal display device with a touch sensor according to claim 1, wherein

the intermediate portion has a first side and a second side along the first direction, and

the overlapped portion is located closer to one of the first side and the second side than to an other of the first side and the second side.

5. The liquid crystal display device with a touch sensor according to claim 1, wherein,

when h1 represents the width of the intermediate portion, and h2 represents the width of the overlapped portion,

h1-h2>

h2 is satisfied.

6. The liquid crystal display device with a touch sensor according to claim 1, wherein

one of the gate lines is located between the first electrodes.

7. The liquid crystal display device with a touch sensor according to claim 6, wherein

each of the first electrodes has a first side and a second side along the first direction, and

the overlapped portion is located at the first side, the first side being closer to the gate line than the second side, in the second direction.

8. The liquid crystal display device with a touch sensor according to claim 1, wherein

the first electrodes are located between the first substrate and the pixel electrodes.

9. The liquid crystal display device with a touch sensor according to claim 1, further comprising:

a plurality of second electrodes each extending in the second direction and being opposed to the first electrodes, the liquid crystal layer being disposed between the first electrodes and the second electrodes,

wherein,

upon the liquid crystal display function being activated, the second electrodes are supplied with the common voltage, and

upon the touch sensor function being activated, the second electrodes receive the first signal from the first electrodes for detecting touch.

10. The liquid crystal display device with a touch sensor according to claim 9, further comprising a detection circuit, wherein

the second electrodes have

a plurality of sensor patterns overlapping the signal lines and the overlapped portions of the first electrodes

a plurality of floating patterns overlapping the pixel electrodes and the intermediate portions of the first electrodes, and

upon the touch sensor function being activated, the sensor patterns provide a received signal based on the first signal to the detection circuit, while the floating patterns are kept in a floating state.