Capacitive sensing detection method for an active pixel matrix

• US 20130314369A1
• Filed: 04/29/2013
• Published: 11/28/2013
• Est. Priority Date: 05/23/2012
• Status: Active Grant

• Current Assignee: Hung-Ta Liu
• Original Assignee: Hung-Ta Liu
• Inventors: LIU, Hung-Ta
• Granted Patent: US 9,684,400 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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 3/0443 using a single layer of sensing electrodes
• 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

The present invention provides a capacitive sensing detection method for an active pixel matrix. The method comprises to select a first sensing region in the active pixel matrix. Then, a first signal is transferred to the first sensing region. Next, a second sensing region is selected. A second signal is transferred to the second sensing region for sensing. Finally, a change of the first signal and the second signal is detected and calculated to determine a position.

Claims

1. A capacitive sensing detection method for an active pixel matrix, comprising:

selecting a first sensing region in the active pixel matrix;

transferring a first signal to the first sensing region;

selecting a second sensing region;

transferring and sensing a second signal in the second sensing region; and

detecting and calculating change of the first signal and the second signal to determine a position.

2. The capacitive sensing detection method of claim 1, wherein the first sensing region comprises a pixel, a pixel segment, a conductive line or a plurality of conductive lines.

3. The capacitive sensing detection method of claim 1, wherein the second sensing region comprises a pixel, a pixel segment, a conductive line or a plurality of conductive lines.

4. The capacitive sensing detection method of claim 1, wherein the second sensing region overlaps the first sensing region, or the second sensing region is adjacent the first sensing region, or the second sensing region separates from the first sensing region.

5. The capacitive sensing detection method of claim 1, further comprising transferring a pulse signal or a high-level voltage signal to the first sensing region before transferring a first signal to the first sensing region.

6. The capacitive sensing detection method of claim 1, further comprising transferring a pulse signal or a high-level voltage signal to the second sensing region before transferring and calculating a second signal to the second sensing region.

7. The capacitive sensing detection method of claim 1, further comprising discharging the first sensing region before transferring and a first signal to the first sensing region.

8. The capacitive sensing detection method of claim 1, further comprising discharging the second sensing region before transferring and calculating a second signal to the second sensing region.

9. The capacitive sensing detection method of claim 1, wherein the first sensing region or the second sensing region further comprises the data lines, the scan lines, the power lines, the Bias lines, the common electrode lines, the reading lines and the control lines of a display.

10. The capacitive sensing detection method of claim 1, wherein the active pixel matrix is disposed in a display.

11. The capacitive sensing detection method of claim 10, wherein the display is an Organic Light Emitting Display, a thin film transistor liquid crystal display, an Electrode Wetting display, an electrophoretic display, a Microelectromechanical Systems (MEMS) display or an optical mode interference MEMS display.

12. The capacitive sensing detection method of claim 10, wherein the display further comprises a backlight module, wherein the capacitive sensing detection method of claim 1 is performed when the backlight module is turned off.

13. The capacitive sensing detection method of claim 10, wherein the display further comprises a front light module, wherein the capacitive sensing detection method of claim 1 is performed when the front light module is turned off.

14. The capacitive sensing detection method of claim 10, wherein the display further comprises a backlight module, wherein the capacitive sensing detection method of claim 1 is performed in a region of the active pixel matrix where does not be lighted by the backlight module.

15. The capacitive sensing detection method of claim 10, wherein the display further comprises a front light module, wherein the capacitive sensing detection method of claim 1 is performed in a region of the active pixel matrix where does not be lighted by the front light module.

16. An integrated circuit is disposed in an active pixel matrix for performing the capacitive sensing detection method of claim 1.