Input device

• US 9,001,088 B2
• Filed: 07/11/2012
• Issued: 04/07/2015
• Est. Priority Date: 07/11/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Yu-Sheop, Lee, Joo-Hoon, Jung, Sun-Tae
• Primary Examiner(s): NGUYEN, KIMNHUNG T
• Application Number:
  US13/546,608
• Publication Number:
  US 20130016073A1
• Time in Patent Office: 1,000 Days
• Field of Search: 345/156, 345165-166, 345173-179, 178 1801- 1804
• US Class Current: 345/179
• CPC Class Codes: G01V 3/40 specially adapted for measuring magnetic field characteristics of the earth
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: G06F 3/046 by electromagnetic means
• CPC Class Codes: H01F 1/047 Alloys characterised by their composition
• CPC Class Codes: H01F 1/401 diluted

Abstract

A magnetic field shielding layer that does not affect an operation of a geo-magnetic sensor in a pointing input device of a touch screen type using an electromagnetic pen is provided. A magnetic field shielding layer is composed of magnetic metal powder. The magnetic field shielding layer is formed directly on the pointing input device without a need for a separate adhesive layer.

Claims

1. An input device comprising:

a display unit for outputting a display screen;

an electromagnetic sensing unit disposed under the display unit to sense a magnetic field generated by an electromagnetic pen upon approaching or contacting a top surface of the display unit;

a magnetic field partial shielding layer disposed under the electromagnetic sensing unit, in which magnetic powder is scattered; and

a geo-magnetic sensor for sensing Earth'"'"'s magnetic field passing through the magnetic field partial shielding layer.

2. The input device of claim 1, wherein the magnetic field partial shielding layer is formed by mixing and spreading the magnetic powder and an adhesive.

3. The input device of claim 1, wherein the magnetic field partial shielding layer has a density with a permeability of 100-200 μ

0 in a Direct Current (DC) band.

4. The input device of claim 1, wherein the magnetic field partial shielding layer has a thickness of 50 μ

m or more, which varies with a permeability of the magnetic field partial shielding layer.

5. The input device of claim 1, wherein the magnetic powder is magnetic metal powder selected from a group consisting of ferrite, MolyPermalloy Powder (MPP), an Fe—

Si—

Al-based material, and an Ni—

Fe-based material.

6. The input device of claim 5, wherein the magnetic field partial shielding layer is formed by mixing the magnetic metal powder and amorphous metal powder with an adhesive.

7. The input device of claim 1, wherein the magnetic field partial shielding layer is formed by being spread onto a surface of the electromagnetic sensing unit.

8. The input device of claim 1, further comprising a Printed Circuit Board (PCB) unit disposed under the magnetic field partial shielding layer, on which the geo-magnetic sensor is disposed.

9. The input device of claim 8, further comprising a shielding layer using an amorphous metal thin film under the magnetic field partial shielding layer and in proximity to a magnetic part when the magnetic part is disposed on or on a side of the PCB unit.

10. The input device of claim 9, wherein the magnetic field partial shielding layer is formed by being spread onto a surface of the electromagnetic sensing unit, and the shielding layer using the amorphous metal thin film is disposed on a portion of the magnetic field partial shielding layer.

11. The input device of claim 9, wherein the magnetic part comprises at least one of a speaker and a camera.

12. The input device of claim 1, wherein the magnetic field partial shielding layer comprises:

a magnetic powder shielding layer on which magnetic powder for transmitting a part of the Earth'"'"'s magnetic field is scattered; and

an amorphous metal shielding layer using an amorphous metal thin film for blocking the magnetic field.

13. The input device of claim 12, wherein a position of the magnetic powder shielding layer and the shielding layer using the amorphous metal thin film differs according to a position of the geo-magnetic sensor.

14. The input device of claim 12, wherein the magnetic powder shielding layer is disposed around the geo-magnetic sensor, and the shielding layer using the amorphous metal thin film is disposed in a region other than a region where the magnetic powder shielding layer is disposed.