# US 9,436,314 B2 · Display device

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- Number: US 9,436,314 B2
- Document ID: US9436314B2
- Status: Granted
- Kind: B2
- Application number: 15/070,404
- Filed: 2016-03-15
- Published: 2016-07-07
- Granted: 2016-09-06
- Earliest claimed: 2013-12-09
- Assignees: Japan Display Inc.
- Applicants: Japan Display Inc.
- Inventors: Masahiro Tokita; Toshiaki Atsuta
- Web page: https://patentgrep.com/patent/US9436314B2

## CPC

- G06F 3/0412: {Digitisers structurally integrated in a display}
- 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)}
- G06F 3/0443: {using a single layer of sensing electrodes}
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

A display device is configured in a display state to allow the common electrode to function as an electrode for display and a scanning electrode for a touch panel, to which a common voltage and a first scanning pulse voltage are supplied, and to allow a detection circuit to detect a touched position based on the voltage detected by the first and the second detection electrodes. In a display stop state, the first detection electrode is configured to function as a temporary scanning electrode, and the detection circuit is configured to supply a second scanning pulse voltage to the first detection electrode so as to detect existence of a swipe based on the voltage detected by the second detection electrode.

## Claims

### Claim 1

A display device comprising:
a display panel including an array substrate and a counter substrate;
a pixel electrode between the array substrate and the counter substrate;
a common electrode between the array substrate and the counter substrate; and
a detection circuit;
wherein
the display panel has a detection electrode,
the detection circuit includes a first switch element, a second switch element, an integration circuit, and a pulse voltage circuit outputting the pulse voltage,
in the first mode, the common electrode is supplied a common voltage for display,
in the second mode, the first switch connects between the detection electrode and the pulse voltage circuit for supplying a pulse voltage to the detection electrode, and the second switch connects between the detection electrode and the integration circuit for detecting a voltage of the detection electrode.

### Claim 2 (depends on 1)

The display device according to claim 1, wherein
the pulse voltage circuit includes a DA converter.

### Claim 3 (depends on 2)

The display device according to claim 2, wherein
the pulse voltage circuit includes a memory, and the DA converter output the pulse voltage based on a data of the memory.

### Claim 4 (depends on 1)

The display device according to claim 1, wherein
the integration circuit accumulates a voltage of the detection electrode.

### Claim 5 (depends on 1)

The display device according to claim 1, wherein
the detection circuit includes sample hold circuit, and
the integration circuit output a voltage to the sample hold circuit.

### Claim 6 (depends on 1)

The display device according to claim 1, wherein
the common electrode is divided into a plurality of blocks.

### Claim 7

A display device comprising:
a display panel including an array substrate and a counter substrate; and
a detection circuit,
wherein the display panel includes a pixel electrode, a common electrode, a first detection electrode and a second detection electrode;
the first detection electrode and the second detection electrode are alternately arranged; the detection circuit includes an integration circuit and a voltage supply circuit;
in a first mode, the common electrode is supplied a common voltage for displaying,
in a second mode, the voltage supply circuit supplies a pulse voltage to the first detection electrode, and the integration circuit accumulates a voltage of the second detection electrode, the detection circuit includes a first switch and a second switch, the first switch connects the voltage supply circuit and the first detection electrode, and the second switch connects the integration circuit and the second detection electrode.

### Claim 8 (depends on 7)

The display device according to claim 7, wherein
the detection circuit includes a DA converter.

### Claim 9 (depends on 8)

The display device according to claim 8, wherein
the detection circuit includes a memory, and the DA converter output the pulse voltage based on a data of the memory.

### Claim 10 (depends on 7)

The display device according to claim 7, wherein
the detection circuit includes sample hold circuit, and the integration circuit output a voltage to the sample hold circuit.

### Claim 11 (depends on 7)

The display device according to claim 7, wherein
the common electrode is divided into a plurality of blocks.