DISPLAY UNIT WITH TOUCH DETECTION FUNCTION AND ELECTRONIC UNIT

• US 20150294629A1
• Filed: 06/15/2015
• Published: 10/15/2015
• Est. Priority Date: 09/29/2010
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Kida, Yoshitoshi, Azumi, Kohei, Noguchi, Koji, Ishizaki, Koji
• Granted Patent: US 10,692,448 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• 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 2310/0278 Details of driving circuits arranged to drive both scan and data electrodes
• CPC Class Codes: G09G 2310/065 Waveforms comprising zero voltage phase or pause
• CPC Class Codes: G09G 2320/0219 Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• 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 3/3685 Details of drivers for data electrodes

Abstract

A display unit with touch detection function includes a plurality of pixel signal lines each transmitting a pixel signal for display; a pixel signal line drive section applying the pixel signal to each of the pixel signal lines; display elements each performing display based on the pixel signal; touch detection electrodes each outputting a detection signal based on a change in capacitance occurring due to an external proximity object; and a touch detection section detecting, in a touch detection period, a touch event based on the detection signal, the touch detection period being different from a display period for the display elements to perform display operation. The pixel signal line drive section maintains a voltage of each of the pixel signal lines at a certain level during the touch detection period.

Claims

1. A display unit comprising:

a plurality of pixel electrodes arranged on a substrate;

at least one pixel signal line configured for connection to the pixel electrodes;

a plurality of touch detection electrodes;

a source driver configured to apply at least one pixel signal to the pixel signal line;

a touch detection section configured to detect a touch event based on a detection signal that is output from the touch detection electrodes during a touch detection time period that is distinct from a display time period during which the pixel signal is supplied to the pixel electrodes;

a switch configured to switch an electrical connection between the source driver and the pixel signal line,

wherein the switch causes the pixel electrodes to be in a floating state during the touch detection time period by disconnecting the pixel signal line from the source driver.

2. The display unit according to claim 1, wherein the at least one pixel signal line is one of a plurality of pixel signal lines, and wherein the switch disconnects each of the pixel signal lines from the source driver during the touch detection period.

3. The display unit according to claim 1 further comprising:

a common drive electrode opposing the pixel electrodes, wherein the common drive electrode functions both as a drive electrode for driving the pixel electrodes and a drive electrode for driving the touch detection electrodes.