Display device with touch detection, drive circuit, driving method, and electronic unit

• US 9,563,302 B2
• Filed: 01/28/2016
• Issued: 02/07/2017
• Est. Priority Date: 04/28/2010
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Noguchi, Koji, Kida, Yoshitoshi, Nakanishi, Takayuki
• Primary Examiner(s): Dicke, Chad
• Application Number:
  US15/008,949
• Publication Number:
  US 20160147349A1
• Time in Patent Office: 376 Days
• Field of Search: 345173-178, 178 1801- 2001
• US Class Current: 1/1
• 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 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

A display device includes: a plurality of drive electrodes; a plurality of detection electrodes intersecting the plurality of drive electrodes; and a scan driving unit performing a first scan drive and a second scan drive. The first scan drive allows a display drive signal for driving the display elements to be applied to each of the plurality of common drive electrodes, and the second scan drive allows a touch detection drive signal for detecting an external proximity object to be applied to each of the plurality of common drive electrodes.

Claims

1. A display device with touch detection comprising:

a plurality of display elements;

a plurality of common electrodes arranged in parallel and that extend in first direction;

a plurality of detection electrodes arranged in parallel and that extend in a direction across the first direction;

a plurality of signal lines connected to the plurality of display elements, respectively, and to which a display drive signal is applied;

a detection circuit configured to detect an external proximity object based on a touch detection signal which is output from the detection electrodes,

a scan driving unit configured to drive the common electrodes with a touch detection drive signal,

wherein the detection circuit is configured to sample a first voltage of the touch detection signal at a first timing before a starting of transition of the touch detection drive signal, and sample a second voltage of the touch detection signal at a second timing after the starting of transition of the touch detection drive signal, the second voltage being different from the first voltage,

wherein detection of the external proximity object is performed on the basis of the difference between the first voltage of the touch detection signal sampled at the first timing and the second voltage of the touch detection signal sampled at the second timing, and

wherein the display drive signal is substantially constant during the period between the first timing and the second timing.