Display device

• US 10,198,117 B2
• Filed: 08/21/2017
• Issued: 02/05/2019
• Est. Priority Date: 04/19/2012
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Nagata, Koji, Doi, Koji
• Primary Examiner(s): Osorio, Ricardo L
• Application Number:
  US15/681,581
• Publication Number:
  US 20170344183A1
• Time in Patent Office: 533 Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• 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 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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 3/0445 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

A display device includes a display panel, a touch panel control unit, a plurality of scanning electrodes formed on the display panel, a plurality of detection electrodes formed on the display panel so as to intersect with the plurality of scanning electrodes, a drive signal supply unit for inputting a drive signal to each of the scanning electrodes, and a detection unit for detecting a detection signal from each of the detection electrodes. The touch panel control unit supplies the driving signal to each of the scanning electrodes from the drive signal supply unit to enable detection of a touch position of a detection object based on the detection signal detected, and supplies the driving signal to all of the scanning electrodes collectively from the drive signal supply unit to enable detection of approach of the detection object to the touch panel based on the detection signal detected.

Claims

1. A display device comprising:

a display panel;

a plurality of counter electrodes on the display panel;

a display signal supply unit for supplying a display signal to the plurality of counter electrodes; and

a touch panel control unit for supplying a sensor signal to the plurality of counter electrodes,

wherein the touch panel control unit is configured to supply the sensor signal sequentially to the respective plurality of counter electrodes for detecting a touch position, and supply the sensor signal simultaneously to all of the plurality of counter electrodes for detecting an approach of a detection object,

the touch panel control unit has a switching element for supplying a high voltage and a low voltage to each of the plurality of counter electrodes,

the switching element is provided for each of the plurality of counter electrodes, for sequentially supplying the sensor signal to the plurality of counter electrodes for detecting the touch position and for simultaneously supplying the sensor signal to all of the plurality of counter electrodes for detecting the approach of the detection object, and

the sensor signal is a pulse signal ranging from the low voltage to the high voltage.

2. The display device according to claim 1, further comprising a plurality of detection electrodes on the display panel.

3. The display device according to claim 2, further comprising a detection unit,

wherein the detection unit includes an input terminal which is connected to the plurality of detection electrodes.

4. A display device comprising:

a display panel;

a plurality of common electrodes on the display panel;

a display signal supply unit for supplying a display signal to the plurality of common electrodes; and

a touch panel control unit for supplying a sensor signal to the plurality of common electrodes,

wherein the touch panel control unit is configured to supply the sensor signal sequentially to the plurality of common electrodes for detecting a touch position, and supply the sensor signal simultaneously to all of the plurality of common electrodes for detecting an approach of a detection object,

the touch panel control unit has a switching element for supplying a high voltage and a low voltage to each of the plurality of common electrodes,

the switching element is provided for each of the plurality of common electrodes, for sequentially supplying the sensor signal to the plurality of common electrodes for detecting the touch position and for simultaneously supplying the sensor signal to all of the plurality of common electrodes for detecting the approach of the detection object, and

the sensor signal is a pulse signal ranging from the low voltage to the high voltage.

5. The display device according to claim 4, further comprising a plurality of detection electrodes on the display panel.

6. The display device according to claim 5, further comprising a detection unit,

wherein the detection unit includes an integration circuit which is connected to the plurality of detection electrodes.