Display unit with touch detection function and electronic unit

• US 20120075240A1
• Filed: 08/26/2011
• Published: 03/29/2012
• Est. Priority Date: 09/29/2010
• Status: Abandoned Application

• Current Assignee: Japan Display Incorporated
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kida, Yoshitoshi, Azumi, Kohei, Noguchi, Koji, Ishizaki, Koji
• Application Number:
  US13/137,565
• Publication Number:
  US 20120075240A1
• Time in Patent Office: Days
• US Class Current: 345/174
• 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 with touch detection function comprising:

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,

wherein 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.

2. The display unit according to claim 1, wherein, during the touch detection period, the pixel signal line drive section applies the voltage of the certain level to each of the pixel signal lines or allows each of the pixel signal lines to be in a floating state.

3. The display unit according to claim 2, wherein the plurality of pixel signal lines are arranged side by side, and

the pixel signal line drive section applies, in the display period, the pixel signals with the same polarities to the pixel signal lines adjacent to each other, and reverses, at every display period, the polarity of each of the pixel signals to be applied.

4. The display unit according to claim 3, wherein a voltage of the touch detection electrode is settled to a predetermined voltage immediately before the touch detection period.

5. The display unit according to claim 4, wherein the touch detection section has a detection switch allowing the detection signal to be transmitted.

6. The display unit according to claim 5, wherein the detection switch stays on in the touch detection period and in a predetermined period, within the display period, immediately before the touch detection period, and stays off in the display period excluding the predetermined period.

7. The display unit according to claim 5, wherein the display period and the touch detection period are alternately provided, and

the pixel signal line drive section sets the voltage of each of the pixel signal lines to a predetermined level in the touch detection period.

8. The display unit according to claim 7, wherein the detection switch stays on in the touch detection period, and stays off in the display period.

9. The display unit according to claim 6, wherein the touch detection section includes an integration circuit integrating the detection signal supplied via the detection switch in the touch detection period.

10. The display unit according to claim 2, wherein the plurality of pixel signal lines are arranged side by side, and

the pixel signal line drive section applies, in the display period, the pixel signals with different polarities to the pixel signal lines adjacent to each other, and reverses, at every display period, the polarity of each of the pixel signals to be applied.

11. The display unit according to claim 10, wherein the pixel signal line drive section applies, in the display period, a mid-level voltage to the pixel signal lines and then applies the respective pixel signals to the pixel signal lines, the mid-level voltage being a voltage at a center between the pixel signals with different polarities.

12. The display unit according to claim 10, wherein the touch detection section includes:

a detection switch allowing the detection signal to be transmitted; and

an integration circuit integrating the detection signal supplied via the detection switch in the touch detection period.

13. A display unit comprising:

a plurality of pixel signal lines;

a drive section applying a pixel signal to each of the pixel signal lines;

display elements each performing display based on the pixel signal; and

a touch detection section detecting, in a touch detection period, a touch event, a touch detection period being different from a display period for the display elements to perform display operation,

wherein the drive section maintains a voltage of each of the pixel signal lines at a certain level during the touch detection period.

14. The display unit according to claim 13, wherein the plurality of pixel signal lines are arranged side by side, and

the drive section applies, in the display period, the pixel signals with the same polarities to the pixel signal lines adjacent to each other, and reverses, at every display period, the polarity of each of the pixel signals to be applied.

15. The display unit according to claim 13, further comprising a touch detection electrode, wherein a voltage of the touch detection electrode is settled to a predetermined voltage before the touch detection period.

16. The display unit according to claim 13, wherein the touch detection circuit includes a detection switch which stays on in the touch detection period and in a predetermined period, within the display period, immediately before the touch detection period, and stays off in the display period excluding the predetermined period.

17. The display unit according to claim 13, wherein the display period and the touch detection period are alternately provided, and

the drive section sets the voltage of each of the pixel signal lines to a predetermined level in the touch detection period.

18. An electronic unit comprising:

a display section with touch detection function; and

a control section performing operation control using the display section with touch detection function,

wherein the display section 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,

wherein 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.