TOUCH SCREEN AND A SYSTEM OF CONTROLLING THE SAME

• US 20170147102A1
• Filed: 04/12/2016
• Published: 05/25/2017
• Est. Priority Date: 11/23/2015
• Status: Active Grant

• Current Assignee: Himax Technologies Ltd. (Himax Technologies Incorporated)
• Original Assignee: Himax Technologies Ltd. (Himax Technologies Incorporated)
• Inventors: Chang, Yaw-Guang, Wang, Hui-Min
• Granted Patent: US 10,146,379 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 2203/04105 Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• 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
• CPC Class Codes: G06F 3/0447 Position sensing using the local deformation of sensor cells

Abstract

A touch screen includes a display, a touch sensor disposed above or within the display, and a conductive layer disposed under the display for detecting pressure.

Claims

1. A touch screen, comprising:

a display;

a touch sensor disposed above or within the display; and

a conductive layer disposed under the display for detecting pressure.

2. The touch screen of claim 1, wherein the conductive layer comprises a plurality of conductive blocks.

3. The touch screen of claim 1 comprises no force-sensitive structure.

4. The touch screen of claim 1, wherein the conductive layer is consisted of a single layer.

5. A touch screen, comprising:

an organic light-emitting diode (OLED) display;

a touch sensor disposed above or within the OLED display; and

a conductive layer disposed under the OLED display for detecting pressure.

6. The touch screen of claim 5, wherein the conductive layer comprises a plurality of conductive blocks.

7. The touch screen of claim 5, wherein the OLED display comprises:

a backplane;

an active-matrix OLED (AMOLED) layer disposed above the backplane; and

an encapsulation layer disposed above the AMOLED layer.

8. The touch screen of claim 7, wherein the backplane comprises thin-film transistors (TFTs) to switch individual pixels on or off.

9. The touch screen of claim 5, further comprising a polarizer disposed above the touch sensor, or disposed between the touch sensor and the OLED display.

10. The touch screen of claim 5 comprises no force-sensitive structure.

11. The touch screen of claim 5, wherein the conductive layer is consisted of a single layer.

12. A system of controlling a touch screen, comprising:

a display driver providing a display signal to a display of the touch screen; and

a touch driver detecting touch pressure by analyzing an induced signal received from a conductive layer disposed under the display;

wherein a capacitance between the display and the conductive layer is affected by touch pressure and revealed in the induced signal.

13. The system of claim 12, wherein the display comprises an organic light-emitting diode (OLED) display.

14. The system of claim 12, wherein the touch driver comprises:

a bandpass filter receiving the induced signal, thereby generating a bandpass signal; and

a processor analyzing frequency content of the bandpass signal to determine the touch pressure according a peak tone of the bandpass signal.

15. The system of claim 14, the touch driver further comprising an analog-to-digital converter (ADC) disposed in front of the bandpass filter, or disposed between the bandpass filter and the processor.

16. The system of claim 14, wherein the touch driver is synchronized with the display driver by the bandpass filter.

17. The system of claim 12, wherein the conductive layer comprises a plurality of conductive blocks.

18. The system of claim 12, wherein the display driver provides a pre-defined signal to the display in a pressure detection period of the touch driver, wherein the pre-defined signal affects the underlying conductive layer, thereby generating the induced signal on the conductive layer.

19. The system of claim 12, wherein the display driver sends a synchronization signal to the touch driver during a pressure detection period of the touch driver.