TOUCH AND DISPLAY DEVICE HAVING AN INTEGRATED SENSOR CONTROLLER

• US 20120319966A1
• Filed: 03/30/2012
• Published: 12/20/2012
• Est. Priority Date: 06/20/2011
• Status: Active Grant

• Current Assignee: Synaptics Incorporated
• Original Assignee: Synaptics Incorporated
• Inventors: REYNOLDS, Joseph Kurth
• Granted Patent: US 9,678,586 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• 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
• CPC Class Codes: Y10T 29/49002 Electrical device making

Abstract

Embodiments of the invention generally provide an input device having a smaller overall physical size and a lower production cost, and is minimally affected by electrical interference versus conventional input devices. Embodiments discussed herein include an input device that has a sensor controller disposed in close proximity to a plurality of sensing elements that are used to sense and acquire positional information of an input object. In one embodiment, the sensor controller and at least portions of the sensor electrodes are disposed between two transparent substrates that are positioned near a display device. In some embodiments, the sensor controller is disposed in an edge region of a substrate which has a sensing region through which the adjacently positioned sensor electrodes are configured to sense the presence of an input object.

Claims

1. An input device, comprising:

a first substrate having a front surface and a rear surface, wherein the rear surface is on a side of the first substrate opposite to the front surface;

a second substrate having a first surface;

a plurality of sensor electrodes; and

a sensor controller communicatively coupled to the plurality of sensor electrodes, wherein at least a portion of the sensor controller and a portion of the plurality of sensor electrodes are disposed in a volume defined by a region of overlap between the rear surface of the first substrate and the first surface of the second substrate.

2. The input device of claim 1, wherein the first substrate and the second substrate are substantially transparent.

3. The input device of claim 1, wherein the front surface is a viewing surface of a display device.

4. The input device of claim 1, wherein the plurality of sensor electrodes are disposed on at least one of the first substrate and the second substrate.

5. The input device of claim 1, wherein the plurality of sensor electrodes comprise a plurality of transmitter electrodes and a plurality of receiver electrodes.

6. The input device of claim 1, further comprising a plurality of conductive routing traces disposed on only one of the first substrate and the second substrate, wherein the conductive routing traces are coupled to the sensor controller and to the plurality of sensor electrodes.

7. The input device of claim 1, wherein the plurality of sensor electrodes comprise a plurality of receiver electrodes.

8. The input device of claim 1, further comprising an active layer of a display device disposed on a third substrate, wherein the third substrate is coupled to the second substrate.

9. The input device of claim 8, wherein the third substrate comprises a thin-film transistor (TFT) substrate, and the active layer is a thin-film transistor (TFT) layer that comprises a plurality of transistors.

10. The input device of claim 1, wherein the plurality of sensor electrodes comprise a plurality of common electrodes, and wherein at least one of the plurality of common electrodes is configured for both capacitive sensing and updating a display of a display device, and wherein the portion of the plurality of sensor electrodes disposed in the volume comprise a plurality of receiver electrodes that are configured to receive resulting signals from at least one of the plurality of common electrodes.

11. The input device of claim 1, further comprising:

a first layer disposed between the rear surface of the first substrate and the first surface of the second substrate, wherein the first layer has a first thickness, and comprises a polarizing layer or an anti-shatter film layer, and wherein the sensor controller has a first surface, a second surface and a sensor controller thickness defined between the first surface of the sensor controller and the second surface of the sensor controller, and the sensor controller thickness is less than or equal to the first thickness.

12. The input device of claim 1, wherein the plurality of sensor electrodes are configured to sense an input object within a sensing region over the first surface of the first substrate, and

wherein the volume defined by a region of overlap between the rear surface of the first substrate and the first surface of the second substrate is further defined by the region of overlap disposed between an edge of the sensing region and an edge of the first or second substrate.

13. The input device of claim 1, wherein the sensor controller has a first surface, a second surface, a sensor controller thickness defined between the first surface and the second surface, a width and a length, wherein the width and the length are each measured in a direction that is parallel to the first surface and are not equal in magnitude.

14. A touch screen, comprising:

a first transparent substrate having a front surface and a rear surface, wherein the rear surface is on a side of the first transparent substrate opposite to the front surface;

a second transparent substrate having a first surface and a second surface, wherein the second surface is on a side of the second transparent substrate opposite to the first surface;

a third substrate having a first surface over which at least a portion of a display device is disposed, wherein the second transparent substrate is disposed between the rear surface of the first transparent substrate and the first surface of the third substrate;

a plurality of sensor electrodes; and

a sensor controller communicatively coupled to the plurality of sensor electrodes, wherein at least a portion of the sensor controller and at least a portion of the plurality of sensor electrodes are disposed in a volume defined between the rear surface of the first transparent substrate and the first surface of the second transparent substrate.

15. The touch screen of claim 14, wherein the at least a portion of the display device further comprises a display controller that is coupled to the third substrate, and wherein the first transparent substrate is a lens that has a viewing surface.

16. The touch screen of claim 14, wherein the plurality of sensor electrodes are disposed on at least one of the first transparent substrate and the second transparent substrate, and wherein the plurality of sensor electrodes comprise at least one of a plurality of transmitter electrodes and receiver electrodes.

17. The touch screen of claim 14, wherein the display device comprises a thin-film transistor (TFT) layer that comprises a plurality of transistors.

18. The touch screen of claim 14, wherein the plurality of sensor electrodes comprise a plurality of common electrodes, and wherein at least one of the plurality of common electrodes is configured for both capacitive sensing and updating a display of the display device, and wherein the plurality of sensor electrodes further comprises a plurality of receiver electrodes that are configured to receive resulting signals from at least one of the plurality of common electrodes.

19. The touch screen of claim 14, wherein the plurality of sensor electrodes are configured to sense a position of an input object disposed over a sensing region formed over the first surface of the first transparent substrate, and

wherein the volume defined between the rear surface of the first transparent substrate and the first surface of the second transparent substrate is further defined by a region disposed between an edge of the sensing region and an edge of the first or second transparent substrate.

20. A method of forming an input device, comprising:

coupling a first surface of a first transparent substrate to a first surface of a second substrate, wherein a plurality of sensor electrodes are disposed between the first surface of the first transparent substrate and the first surface of the second substrate; and

coupling a sensor controller that is electrically coupled to the plurality of sensor electrodes to either the first surface of the first transparent substrate or the first surface of the second substrate so that the sensor controller is disposed in a volume defined between the first surface of the first transparent substrate and the first surface of the second substrate.

21. The method of claim 20, wherein the plurality of sensor electrodes comprises a plurality of common electrodes, wherein at least one of the plurality of common electrodes is configured for capacitive sensing and updating a display of a display device, and wherein the plurality of sensor electrodes further comprises a plurality of receiver electrodes that are configured to receive resulting signals from at least one of the plurality of common electrodes

22. The method of claim 20, wherein the plurality of sensor electrodes comprises at least one of a plurality of receiver electrodes and a plurality of transmitter electrodes.