Process of integrating a digitizer input device in a display

• US 20070018969A1
• Filed: 07/21/2006
• Published: 01/25/2007
• Est. Priority Date: 07/21/2005
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: TPO Displays Corporation (InnoLux Corporation)
• Inventors: Lee, Yingchih, Chen, Dinguo
• Granted Patent: US 7,852,324 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133565 inside the LC elements, i.e. between the cell substrates
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display

Abstract

A process for integrating digitizer sensor array into flat panel displays. The sensor array is formed on the side of the display element (e.g., LC layer or OLED layer) where the pixel control switches (e.g., thin film transistors (TFTs)) of the display module are present, or on the other side of the display element where the pixel control switches are not present. In particular, the sensor array may be formed (a) before planarization layer of the pixel control switches, (b) after forming the planarization layer of the pixel control switches, (c) prior to forming the pixel control switches (e.g., formed on the substrate, before or after forming an electrode on the substrate), and/or (d) formed above or below a color filter layer, e.g., in the case of an LCD module, or above or below the encapsulating layer, e.g., in the case of an OLED display module.

Claims

1. A process of forming a digitizer for user input with respect to a display module, comprising:

providing a display module having a display element, which comprises a first substrate and a second at a distance from the first substrate, defining a space therebetween, in which the display element is supported; and

providing the digitizer in the space defined by the first substrate and second substrate, between the display element and one of the first substrate and second substrate.

2. A process as in claim 1, wherein the digitizer comprises an electromagnetic digitizer.

3. A process as in claim 1, wherein the digitizer comprises a sensor array that is formed using a semiconductor process.

4. A process as in claim 3, wherein the semiconductor process includes a photolithography process.

5. A process as in claim 1, further comprising forming an array of pixel control switches on the first substrate, wherein the digitizer is formed between the array of pixel control switches and one of (a) the display element, and (b) the first substrate.

6. A process as in claim 5, further comprising disposing a planarization layer between the array of pixel control switches and the display element, wherein the digitizer is formed between the planarization layer and at least one of:

(a) the display element, and (b) the array of pixel control switches.

7. A process as in claim 5, wherein the array of pixel control switches comprises an array of thin film transistors (TFTs).

8. A process as in claim 7, wherein the TFTs are of at least one of LPTS TFT type and a-Si TFT type.

9. A process as in claim 1, further comprising forming an array of pixel control switches on the first substrate, wherein the digitizer is formed between the display element and the second substrate.

10. A process as in claim 9, further comprising forming a color filter layer between the second substrate and the display element, wherein the digitizer is formed between the color filter layer and at least one of:

(a) the display element, and (b) the second substrate.

11. A process as in claim 10, wherein the display element comprises a liquid crystal display element.

12. A process as in claim 9, further comprising forming an encapsulating layer between the second substrate and the display element, wherein the digitizer is formed between the encapsulating layer and at least one of:

(a) the display element, and (b) the second substrate.

13. A process as in claim 12, wherein the display element comprises an OLED display element.

14. A process of forming a display device, comprising:

providing a display module comprising a digitizer formed according to the process in claim 1;

and

providing a controller operatively coupled to the display module including the digitizer, to synchronize operation of the display element and the digitizer.

15. A process of forming a display system, comprising:

providing a display device formed according to the process in claim 14;

and

providing an interface controller coupled to the display device, exchanging image data and user input data from the digitizer with a controller in an electronic device.

16. A process of forming an electronic device, comprising:

providing a display system formed according to the process in claim 15;

and

providing a controller operatively coupled to the interface controller of the display system, to exchange image data and user input data from the electromagnetic digitizer.

17. A process for integrating a digitizer in a display module having a display element, comprising:

providing a first substrate;

positioning a second substrate at a distance from the first substrate, defining a space therebetween, in which the display element is supported; and

providing the digitizer in the space defined by the first substrate and second substrate, between the display element and one of the first substrate and second substrate.

18. A method of providing user input to an electronic device, comprising:

providing a display module having a display element, which comprises a first substrate, a second substrate positioned at a distance from the first substrate, defining a space therebetween, in which the display element is supported; and

providing a digitizer in the space defined by the first substrate and second substrate, between the display element and one of the first substrate and second substrate.

19. A method as in claim 18, wherein the digitizer comprises an electromagnetic digitizer.

20. A method as in claim 19, wherein operation of the digitizer is synchronized to an image displayed by the display module, such that a user can input using the digitizer in response to the image displayed.