Display device with a touch sensor

• US 10,146,368 B2
• Filed: 07/21/2017
• Issued: 12/04/2018
• 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:
  US15/656,518
• Publication Number:
  US 20170322668A1
• Time in Patent Office: 501 Days
• Field of Search: 345173, 345174, 345156, 345204
• 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 display device with a touch sensor having a display function and a touch sensor function, the display device comprising:

a first substrate including a pixel electrode;

a first electrode facing the pixel electrode;

a second substrate;

a second electrode that is included in the second substrate and that faces the first electrode and the pixel electrode; and

a liquid crystal layer that is sandwiched between the pixel electrode and the second electrode and in which an orientation of liquid crystal is controlled according to a vertical electric field between the pixel electrode and the second electrode,

wherein

the second electrode is divided into patterns that include;

a first pattern part used for touch detection; and

a second pattern part that is a floating pattern used for load reduction.

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

the pixel electrode is provided between the first electrode and the liquid crystal layer, and

a holding capacitor is formed between the pixel electrode and the first electrode.

3. The display device with a touch sensor according to claim 1, wherein an electrostatic capacitance for touch detection is formed between the first electrode and the second electrode.

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

the first electrode has

a first width where the first electrode crosses the first pattern part of the second electrode and

a second width where the first electrode crosses the second pattern part of the second electrode, and

the first width is narrower than the second width.

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

the first substrate includes a source line that is connected to the pixel electrode, and

the first pattern is arranged to overlap the source line.

6. The display device with a touch sensor according to claim 5, wherein

the first substrate includes a gate line that is crossing the source line, and

the first electrode is provided along the gate line and crossing the source line.

7. The display device with a touch sensor according to claim 1,

wherein, in a touch detection period,

the first pattern part is used for touch detection, and

the second pattern part is in a floating state.