Sensor-equipped display device

• US 9,791,972 B2
• Filed: 03/18/2015
• Issued: 10/17/2017
• Est. Priority Date: 03/18/2014
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Kurasawa, Hayato, Mizuhashi, Hiroshi, Ishizaki, Koji, Watanabe, Yoshihiro, Ikeda, Masanobu
• Primary Examiner(s): Lam, Vinh
• Application Number:
  US14/661,530
• Publication Number:
  US 20150268795A1
• Time in Patent Office: 944 Days
• Field of Search: 345173-179, 17811801- 2004
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• 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

According to one embodiment, a sensor-equipped display device includes a display panel, first driver, and second driver. The display panel includes a common electrode, a pixel electrode, a detection electrode, a connection line and lead line. The first driver supplies a common driving signal to the common electrode during a display drive time and supplies a sensor driving signal to the common electrode during a sensing drive time. The second driver detects a sensor output value during the sensing drive time. The lead line and the common electrode are apart from each other with a certain gap at least during the sensing drive time.

Claims

1. A sensor-equipped display device comprising:

a display panel having a display area, a non-display area surrounding the display area and a boundary therebetween, the display panel comprising;

a common electrode, a pixel electrode and a detection electrode in a stacked arrangement in a display area,

a shield electrode disposed between the boundary and the common electrode,

a connection line connected to the detection electrode, and

a lead line provided in the non-display area, wherein the lead line is wired along the boundary and electrically connected to the detection electrode via the connection line;

a first driver connected to the common electrode, wherein the first driver supplies a common driving signal to the common electrode during a display drive time when an image is displayed with the common electrode and the pixel electrode, and wherein the first driver supplies a sensor driving signal to the common electrode during a sensing drive time when sensing is performed with the common electrode and the detection electrode;

a second driver connected to the lead line, wherein the second driver receives a sensor output value of the detection electrode from the lead line;

a third driver connected to the shield electrode, wherein the third driver supplies the common driving signal to the shield electrode during the display drive time, and wherein the third driver maintains the shield electrode at a potential different from a potential of the sensor driving signal during the sensing drive time;

a first gap in the sensing drive time provided between the lead line and the common electrode; and

a second gap in the display drive time provided between the lead line and shield electrode, wherein the first gap is wider than the second gap.

2. The sensor-equipped display device of claim 1, wherein the third driver maintains the shield electrode at ground potential during the sensing drive time.

3. The sensor-equipped display device of claim 1, wherein the third driver switches the shield electrode to an electrically floating state during the sensing drive time.

4. The sensor-equipped display device of claim 1, wherein the display panel further comprises a first substrate and a second substrate arranged opposite to each other with a gap therebetween,

wherein the common electrode, the pixel electrode, and the shield electrode are disposed on the first substrate at an inner surface side, and

wherein the detection electrode, the connection line, and the lead line are disposed on the second substrate at an outer surface side.

5. The sensor-equipped display device of claim 1, wherein at least a portion of the detection electrode is bundled by the connection line.

6. A sensor-equipped display device comprising:

a display panel having a display area, a non-display area surrounding the display area and a boundary therebetween, the display panel comprising;

a plurality of common electrodes, a plurality of pixel electrodes and a plurality of detection electrodes in a stacked arrangement in the display area,

a connection line connected to the detection electrodes, and

a lead line provided in the non-display area, wherein the lead line is wired along the boundary and electrically connected to the detection electrodes via the connection line;

a first driver connected to the common electrodes, wherein the first driver supplies a common driving signal to the common electrodes during a display drive time when an image is displayed with the common electrodes and the pixel electrodes, and wherein the first driver supplies a sensor driving signal to the common electrodes except to one of the common electrodes that is closest to the lead line during a sensing drive time when sensing is performed with the common electrodes and the detection electrodes; and

a second driver connected to the lead line, wherein the second driver receives a sensor output value of the detection electrodes from the lead line,

wherein in each of the driving time, the lead line and the common electrode which is the closest to the lead line and is provided with the driving signal are spaced apart with a certain gap, and

wherein the gap is wider in the sensing drive time than in the display drive time.

7. The sensor-equipped display device of claim 6, wherein the display panel further comprises a first substrate and a second substrate arranged opposite to each other with a gap therebetween,

wherein the common electrodes, the pixel electrodes, and the shield electrode are disposed on the first substrate at an inner surface side, and

wherein the detection electrodes, the connection line, and the lead line are disposed on the second substrate at an outer surface side.

8. The sensor-equipped display device of claim 6, wherein at least a portion of the detection electrodes are bundled by the connection line.