Display with an electrically conducting layer

• US 7,259,809 B2
• Filed: 12/20/2001
• Issued: 08/21/2007
• Est. Priority Date: 12/23/2000
• Status: Expired due to Fees

• Current Assignee: Continental Automotive GmbH (Continental AG)
• Original Assignee: Siemens AG
• Inventors: Brandt, Peter, Zimmermann, Michael, Wesner, Gerhard, Brohm, Thomas
• Primary Examiner(s): Nelms; David
• Assistant Examiner(s): NGUYEN, THANH NHAN P
• Application Number:
  US10/451,441
• Publication Number:
  US 20040075786A1
• Time in Patent Office: 2,070 Days
• Field of Search: 349 58- 59, 349/149, 361/681, 345/173
• US Class Current: 349/59
• 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 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0444 using a single conductive element covering the whole sensing surface, e.g. by sensing the electrical current flowing at the corners

Abstract

A display for showing text and graphical images includes an electrically conducting layer which is connected to a shield potential, such as a ground potential, for shielding the display from external electromagnetic disturbances and preventing radiation from the display of electromagnetic disturbances generated by the display.

Claims

1. A display for showing text and graphical images, comprising:

a liquid crystal display having a display surface and means for displaying the text and graphical images, said means comprising electrodes connected to a driving circuit;

a terminal connected to a shielding potential;

an electrically conducting layer covering said display surface area, said electrically conducting layer being separate from said electrodes, and

a connection comprising a capacitance between said electrically conducting layer and said terminal connected to a shielding potential, said connection connecting high frequency signals on said electrically conducting layer to said shielding potential for at least one of shielding said display from external electromagnetic disturbances and preventing radiation from said display of electromagnetic disturbances generated by said means for displaying.

2. The display of claim 1, further comprising a capacitor providing said capacitance.

3. The display of claim 1, wherein said terminal connected to said shielding potential is connected to one of a metal housing and a metallized housing enclosed by said display.

4. The display of claim 1, wherein said shielding potential is a ground potential.

5. The display of claim 1, wherein said electrically conducting layer comprises indium-tin oxide.

6. The display of claim 1, wherein said electrically conducting layer comprises a heating device.

7. The display of claim 6, wherein said electrically conducting layer comprises current-conducting paths arranged on said liquid-crystal display.

8. The display of claim 7, wherein said liquid-crystal display comprises electrodes and said current-conducting paths are arranged between said electrodes.

9. The display of claim 7, wherein said currently conducting paths comprise indium-titanium oxide.

10. The display of claim 1, further comprising a touch screen, wherein said electrically conducting layer comprises a part of said touch screen.

11. The display of claim 10, wherein said electrically-conducting layer is also arranged for heating the liquid-crystal display.

12. The display of claim 1, wherein said means for displaying comprises a driver circuit controlling said display and said high frequency signals connected to said shielding potential are caused by said drive electronics, said connection preventing electromagnetic disturbances caused by radiation of said high frequency signals in an area surrounding said display.