Electromagnetic touch display device and method for manufacturing the same

• US 9,891,776 B2
• Filed: 05/23/2014
• Issued: 02/13/2018
• Est. Priority Date: 10/23/2013
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd., Hefei BOE Optoelectronics Technology Company Limited (BOE Technology Group Co., Ltd.)
• Original Assignee: BOE Technology Group Co., Ltd., Hefei BOE Optoelectronics Technology Company Limited (BOE Technology Group Co., Ltd.)
• Inventors: Zhou, Xiaoliang, Yu, Lixia
• Primary Examiner(s): Karimi, Pegeman
• Application Number:
  US14/422,330
• Publication Number:
  US 20160026301A1
• Time in Patent Office: 1,362 Days
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/046 by electromagnetic means

Abstract

The present disclosure provides an electromagnetic touch display device and a method for manufacturing the same. The electromagnetic touch display device includes a display device and an electromagnetic stylus. The display device includes an array substrate, a color filter substrate, a grid array electromagnetic induction layer and a control circuit. The grid array electromagnetic induction layer is arranged on the array substrate or the color filter substrate. The control circuit is connected to the grid array electromagnetic induction layer and configured to detect position information of the electromagnetic stylus on the grid array electromagnetic induction layer.

Claims

1. An electromagnetic touch display device, comprising a display device and an electromagnetic stylus, wherein the display device comprises an array substrate, a color filter substrate, a grid array electromagnetic induction layer and a control circuit, wherein

the grid array electromagnetic induction layer is arranged on and in direct contact with a glass substrate of the array substrate or the color filter substrate, and

the control circuit is connected to the grid array electromagnetic induction layer and configured to detect position information of the electromagnetic stylus on the grid array electromagnetic induction layer,

wherein the grid array electromagnetic induction layer comprises a plurality of X-axis loop coils and a plurality of Y-axis loop coils insulated from the plurality of X-axis loop coils,

wherein the control circuit comprises an X-axis receiver, a Y-axis receiver, a coil switch, a high-frequency AC signal generator and a position information detector,

first ends of the plurality of Y-axis loop coils are supplied with a reference voltage, and first ends of the plurality of X-axis loop coils are supplied with a reference voltage,

the high-frequency AC signal generator is (i) connected to a second end of one or more Y-axis loop coils via the coil switch and configured to output an AC current to the Y-axis loop coils at a charging stage, or (ii) connected to a second end of one or more X-axis loop coils via the coil switch, and configured to output an AC current to the X-axis loop coils at a charging stage, or (iii) connected to a second end of one or more Y-axis loop coils via the coil switch and to a second end of one or more X-axis loop coils via the coil switch, and configured to output an AC current to the Y-axis loop coils and the X-axis loop coils at a charging stage.

2. The electromagnetic touch display device according to claim 1, wherein the plurality of X-axis loop coils and the plurality of Y-axis loop coils are formed on the array substrate.

3. The electromagnetic touch display device according to claim 2, wherein

the position information detector is connected to second ends of the plurality of X-axis loop coils via the X-axis receiver and to the second ends of the plurality of Y-axis loop coils via the Y-axis receiver, and configured to determine the position information of the electromagnetic stylus on the grid array electromagnetic induction layer by detecting voltages of the plurality of X-axis loop coils and the plurality of Y-axis loop coils after the charging stage.

4. The electromagnetic touch display device according to claim 3, wherein the control circuit is arranged on a printed circuit board, and an electromagnetic signal processing interface of the grid array magnetic induction layer is connected to the control circuit on the printed circuit board via a flexible circuit board.

5. The electromagnetic touch display device according to claim 2, wherein the control circuit is arranged on a printed circuit board, and an electromagnetic signal processing interface of the grid array magnetic induction layer is connected to the control circuit on the printed circuit board via a flexible circuit board.

6. The electromagnetic touch display device according to claim 1, wherein the plurality of X-axis loop coils and the plurality of Y-axis loop coils are formed on the color filter substrate.

7. The electromagnetic touch display device according to claim 6, wherein

the position information detector is connected to second ends of the plurality of X-axis loop coils via the X-axis receiver and to the second ends of the plurality of Y-axis loop coils via the Y-axis receiver, and configured to determine the position information of the electromagnetic stylus on the grid array electromagnetic induction layer by detecting voltages of the plurality of X-axis loop coils and the plurality of Y-axis loop coils after the charging stage.

8. The electromagnetic touch display device according to claim 6, wherein the control circuit is arranged on a printed circuit board, and an electromagnetic signal processing interface of the grid array magnetic induction layer is connected to the control circuit on the printed circuit board via a flexible circuit board.

9. The electromagnetic touch display device according to claim 1, wherein the control circuit is arranged on a printed circuit board, and an electromagnetic signal processing interface of the grid array magnetic induction layer is connected to the control circuit on the printed circuit board via a flexible circuit board.

10. A method for manufacturing an electromagnetic touch display device comprising a display device and an electromagnetic stylus, wherein the display device comprises an array substrate, a color filter substrate, a grid array electromagnetic induction layer and a control circuit,

the method comprising a step of arranging a grid array electromagnetic induction layer on and in direct contact with a glass substrate of an array substrate or a color filter substrate,

wherein the step of arranging the grid array electromagnetic induction layer comprises arranging a plurality of X-axis loop coils and a plurality of Y-axis loop coils insulated from the plurality of X-axis loop coils,

wherein the control circuit comprises an X-axis receiver, a Y-axis receiver, a coil switch, a high-frequency AC signal generator and a position information detector,

first ends of the plurality of Y-axis loop coils are supplied with a reference voltage, and first ends of the plurality of X-axis loop coils are supplied with a reference voltage,

the high-frequency AC signal generator is (i) connected to a second end of one or more Y-axis loop coils via the coil switch and configured to output an AC current to the Y-axis loop coils at a charging stage, or (ii) connected to a second end of one or more X-axis loop coils via the coil switch, and configured to output an AC current to the X-axis loop coils at a charging stage, or (iii) connected to a second end of one or more Y-axis loop coils via the coil switch and to a second end of one or more X-axis loop coils via the coil switch, and configured to output an AC current to the Y-axis loop coils and the X-axis loop coils at a charging stage.

11. The method according to claim 10, wherein the step of arranging the grid array electromagnetic induction layer on the array substrate comprises:

forming the plurality of X-axis loop coils on a glass substrate of the array substrate;

forming a passivation insulation layer on the plurality of X-axis loop coils; and

forming the plurality of Y-axis loop coils on the passivation insulating layer.

12. The method according to claim 11, wherein

the step forming the plurality of X-axis loop coils on the glass substrate of the array substrate comprises forming the plurality of X-axis loop coils by coating an indium tin oxide (ITO) material onto the glass substrate, and

the step of forming the plurality of Y-axis loop coils on the passivation insulating layer comprises forming the plurality of Y-axis loop coils by coating an ITO material onto the passivation insulation layer.

13. The method according to claim 10, wherein the step of arranging the grid array electromagnetic induction layer on the color filter substrate comprises:

forming the plurality of X-axis loop coils on a glass substrate of the color filter substrate;

forming a passivation insulation layer on the plurality of X-axis loop coils; and

forming the plurality of Y-axis loop coils on the passivation insulation layer.

14. The method according to claim 13, wherein

the step of forming the plurality of X-axis loop coils on the glass substrate of the color filter substrate comprises forming the plurality of X-axis loop coils by coating an ITO material onto the glass substrate, and

the step of forming the plurality of Y-axis loop coils on the passivation insulation layer comprises forming the plurality of Y-axis loop coils by coating an ITO material onto the passivation insulation layer.