Display device and driving method performing display scan operation and detection scan operation

• US 9,953,604 B2
• Filed: 11/17/2014
• Issued: 04/24/2018
• Est. Priority Date: 06/30/2009
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Noguchi, Kouji, Nakanishi, Takayuki, Ishizaki, Koji, Teranishi, Yasuyuki, Takeuchi, Takeya
• Primary Examiner(s): MISTRY, RAM A
• Application Number:
  US14/543,202
• Publication Number:
  US 20150070318A1
• Time in Patent Office: 1,254 Days
• Field of Search: 345156, 345173-178, 345204
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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 2310/02 Addressing, scanning or driving the display screen or processing steps related thereto
• CPC Class Codes: G09G 2320/0252 Improving the response speed
• CPC Class Codes: G09G 2340/0435 Change or adaptation of the frame rate of the video stream
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3674 Details of drivers for scan electrodes
• CPC Class Codes: G09G 5/18 Timing circuits for raster scan displays specially adapted for television H04N ; synchronisation between the display unit and other display units, videodisc player G09G5/12

Abstract

Disclosed herein is a display device, including: a display surface; a display functional layer adapted to control the display of a screen viewed from outside the display surface; a drive control section operable to perform display scanning and driving adapted to scan and drive, in the one direction, the plurality of drive electrodes, and also operable to perform, a plurality of times and for M display screens, detection scanning and driving adapted to continuously scan and drive all or part of the plurality of drive electrodes within the period of time; and a plurality of sensor lines arranged in a direction other than the one direction to be separate from each other, which produce an electrical change if an object to be detected comes in contact with or proximity to the display surface while the drive control section performs the detection scanning and driving.

Claims

1. A display device, comprising:

a plurality of pixel electrodes arranged in a first area,

a plurality of drive electrodes arranged in the first area and corresponding to the plurality of pixel electrodes;

a drive controller configured to;

drive all of the plurality of pixel electrodes as a display scan operation,

sequentially drive all of the plurality of drive electrodes as a detection scan operation, and

perform the detection scan operation two or more times during one time of the display scan operation,

wherein the plurality of drive electrodes include a first end drive electrode arranged at a first end of the first area and a second end drive electrode arranged at a second end of the first area in a first direction;

wherein the drive controller starts a second detection scan operation including a first part and a second part after a first detection scan operation during one time of the display scan operation;

wherein the drive controller is configured to scan continuously from a third drive electrode of the plurality of drive electrodes to the second end drive electrode as the first part of the second detection scan operation; and

scan continuously from the first end drive electrode to the third drive electrode as the second part of the second detection scan operation,

wherein the third drive electrode is next to a first display area in the first direction, and

wherein the first display area is an area in which the drive controller drives at least one of the plurality of pixel electrodes at a most recent timing at which the drive controller starts the second detection scan operation.

2. The display device according to claim 1,

wherein the plurality of pixel electrodes are present on a first plane of the first area and the plurality of drive electrodes are present on a second plane of the first area that is different from the first plane.

3. The display device according to claim 1,

further comprising a plurality of sensor electrodes, wherein the plurality of sensor electrodes are configured to output an electrical change while the drive controller scans the plurality of drive electrodes.

4. The display device according to claim 1,

wherein the drive controller is configured to scan the plurality of pixel electrodes from a first end to a second end in the first direction and scan the plurality of drive electrodes from the first end to the second end in the first direction and wherein the third drive electrode is between the first display area and the second end.

5. A method of driving a display device including a plurality of pixel electrodes arranged in a first area and a plurality of drive electrodes arranged in the first area and corresponding to the plurality of pixel electrodes, wherein the plurality of drive electrodes include a first end drive electrode arranged at a first end of the first area and a second end drive electrode arranged at a second end of the first area in a first direction:

the method comprising;

performing a detection scan operation two or more times during one time of a display scan operation;

wherein the display scan operation is an operation in which all of the plurality of pixel electrodes are scanned sequentially;

wherein the detection scan operation is an operation in which all of the plurality of drive electrodes are scanned sequentially;

wherein the drive controller starts a second detection scan operation including a first part and a second part after a first detection scan operation during one time of the display scan operation;

scanning continuously from a third drive electrode of the plurality of drive electrodes to the second end drive electrode as the first part of the second detection scan operation; and

scanning continuously from the first end drive electrode to the third drive electrode as the second part of the second scan detection scan operation,

wherein the third drive electrode is next to a first display area in the first direction, and

wherein the first display area is an area in which at least one of the plurality of pixel electrodes is driven at a most-recent timing at which the second detection scan operation starts.