Capacitive based gesture input system

• US 10,474,298 B2
• Filed: 03/14/2013
• Issued: 11/12/2019
• Est. Priority Date: 03/14/2013
• Status: Active Grant

• Current Assignee: Microchip Technology Incorporated
• Original Assignee: Microchip Technology Incorporated
• Inventors: Curtis, Keith Edwin
• Primary Examiner(s): Gupta, Parul J
• Application Number:
  US13/831,517
• Publication Number:
  US 20140267138A1
• Time in Patent Office: 2,434 Days
• Field of Search: None
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/134327 Segmented, e.g. alpha numeric display
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0488 using a touch-screen or digitiser, e.g. input of commands through traced gestures

Abstract

A liquid crystal display with integrated capacitive touch sensors has an LCD display with at least one alphanumerical or graphic symbol, and at least one capacitive touch sensor arranged above a display layer or within transparent layers of the LCD display forming the alphanumerical or graphical symbol.

Claims

1. An LCD display with integrated capacitive touch sensors comprising:

an LCD display comprising at least one numeric or alphanumeric symbol formed by a plurality of electrodes;

at least a first and second capacitive touch sensor arranged above a display layer or within transparent layers of the LCD display forming the at least one numeric or alphanumerical symbol and wherein the at least first and second capacitive touch sensor is associated with a single numeric or alphanumeric symbol and arranged in a layer above the single numeric or alphanumerical symbol such that the at least first and second capacitive touch sensor at least partly covers and overlays the single numeric or alphanumeric symbol.

2. The LCD display according to claim 1, wherein the at least first and second capacitive touch sensors are formed within a transparent layer integrated within the LCD display and arranged above an LCD electrode layer comprising the plurality of electrodes.

3. The LCD display according to claim 1, wherein the at least first and second capacitive touch sensors is arranged on top of a glass layer of the LCD display.

4. The LCD display according to claim 1, wherein the at least first and second touch sensors are coupled with an external pin of the LCD display.

5. The LCD display according to claim 1, wherein the at least first and second capacitive touch sensors are formed by first and second electrode pads that are separately arranged next to each other and above the single numeric or alphanumeric symbols, wherein a combined surface area of the first and second electrode pads has approximately the same size as a size of the single numeric or alphanumeric symbol.

6. The LCD display according to claim 5, wherein the at least first and second electrode pads are shaped such to provide for a slider functionality.

7. The LCD display according to claim 1, wherein the numeric or alphanumerical symbol is a 7-segment display or a dot-matrix character display.

8. A system comprising an LCD display according to claim 1 and a controller for driving said LCD display and for evaluating the at least first and second touch sensors.

9. The system according to claim 8, wherein the LCD display comprises a plurality of first and second touch sensors each first and second touch sensor associated with one numeric or alphanumeric symbol and wherein the controller is configured to determine a gesture by means of the plurality of first and second touch sensors.

10. The system according to claim 9, wherein the controller is further configured to alter a display information according to a determined gesture.

11. The system according to claim 9, wherein the plurality of first and second touch sensors are used to form at least one of, a touch button, a slider, and a gesture determination button.

12. The system according to claim 8, wherein the controller and LCD display form a module.

13. The system according to claim 12, wherein the module is a chip on glass module.

14. The system according to claim 13, wherein the controller is a microcontroller.

15. The LCD display according to claim 1, further comprising another capacitive touch sensor having a single capacitive touch sensor pad arranged above another numeric or alphanumeric symbol, wherein a surface area of the single capacitive touch sensor pad has approximately the same size as a size of the numeric or alphanumeric symbol.

16. The LCD display according to claim 1, further comprising another capacitive touch sensor comprising a single capacitive touch sensor pad arranged above a group of alphanumeric or graphical symbols, wherein a surface area of the single capacitive touch sensor pad has approximately the same size as a size of the group of alphanumeric or graphical symbols.

17. A method for determining and evaluating an input performed by touching an LCD display comprising:

arranging a first and second touch sensor pads in a layer above a layer comprising electrodes forming segments of a numeric or alphanumeric symbol of the LCD display wherein the first and second sensor pads are arranged adjacent to each other and associated with and overlay and cover at least a part of an associated numeric or alphanumeric symbol formed by said electrodes;

determining a gesture performed across the first and second touch sensor pads;

providing feedback by controlling the LCD display electrodes of the alphanumeric or graphic symbol to display a different numeric or alphanumeric symbol.

18. The method according to claim 17, wherein the first and second touch sensor pads are arranged above a numeric or alphanumeric symbol or within a transparent layer of the LCD display above the numeric or alphanumeric symbol and when a gesture in which a finger slides from the bottom to the top is detected, the feedback comprises displaying an increased number or a next character in a sequence of characters displayed by the associated numeric or alphanumeric symbol under said two touch sensor pads, wherein signals from the first and second touch sensor pads are evaluated to determine the gesture.

19. The method according to claim 18, wherein each gesture shifts the display numbers by one and wherein a last number to the left or right is dropped and a first number to the right or left, respectively is filled with a zero.

20. The method according to claim 17, wherein of the first and second touch sensor pads are arranged above a numeric or alphanumeric symbol or within a transparent layer of the LCD display above the numeric or alphanumeric symbol and when a gesture in which a finger slides from the top to the bottom is detected, the feedback comprises displaying an decreased number or a previous character in a sequence of characters displayed by the associated numeric or alphanumeric symbol under said two touch sensor pads, wherein signals from the first and second touch sensor pads are evaluated to determine the gesture.

21. The method according to claim 17, wherein a plurality of numbers can be displayed by a plurality of numeric or alphanumeric symbols each comprising associated touch pads arranged above the plurality of numeric or alphanumeric symbols, wherein each number comprises at least one associated sensor pad and wherein displayed numbers are shifted from left to right through the plurality of numbers if a gesture is detected in which a finger slides from left to right over the plurality of numbers and wherein displayed numbers are shifted from right to left through the plurality of numbers if a gesture is detected in which a finger slides from right to left over the plurality of numbers.

22. The method according to claim 17, wherein of the first and second touch sensor pads are arranged above a numeric or alphanumeric symbol and when a gesture is detected in which a finger slides from the bottom to the top and further away from the top, the feedback comprises displaying a sequence of increased numbers or next characters in a sequence of characters by the associated numeric or alphanumeric symbol under said two touch sensor pads until a further touch of one of the two sensor pads is detected, wherein signals from the two touch sensor pads are evaluated to determine the gesture.

23. The method according to claim 17, wherein a display plane extends horizontally and vertically and two of the plurality of touch sensor pads are arranged vertically above each other and overlay a numeric or alphanumeric symbol and when a gesture is detected in which a finger slides from the top to the bottom and away from the bottom, the feedback comprises displaying a sequence of decreased numbers or previous characters in a sequence of characters by the associated numeric or alphanumeric symbol under said two touch sensor pads until a further touch of one of the two sensor pads is detected, wherein signals from the two touch sensor pads are evaluated to determine the gesture.

24. An LCD display with integrated capacitive touch sensors comprising:

an LCD display having a surface and comprising at least one seven segment number formed by seven segment electrodes;

a first and second electrode pad arranged in a layer above the seven segment electrodes, wherein a combined surface area of the first and second electrode pads has approximately the same size as a size of the seven segment number and substantially overlays a surface portion of the LCD display occupied by the seven segment number.