Display device

Patent metadata

Field	Value
Publication number	US-9501197-B2
Application number	US-201615093645-A
Country	US
Kind code	B2
Filing date	Apr 7, 2016
Priority date	Oct 25, 2012
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

A display device for displaying information to a user in correspondence with a display signal. The display device includes an LCD receiving the display signal and displaying information in accordance with the display signal. The display device additionally includes a capacitive touch panel having an electrically conductive surface. The capacitive touch panel provides a signal corresponding to the location of an object touching or placed in close proximity to the surface of the capacitive touch panel for providing user input. A chassis supports the LCD and capacitive touch panel in the device. A capacitor capacitively connects the electrically conductive surface of the capacitive touch panel to the chassis.

First claim

The invention claimed is:

1. A display device for displaying information to a user in correspondence with a display signal, the display device comprising:
an LCD receiving the display signal and displaying information in correspondence therewith;
a capacitive touch panel having an electrically conductive surface, the capacitive touch panel providing a signal corresponding to the location of an object placed in contact or proximity with the surface for providing user input;
a chassis supporting the LCD and capacitive touch panel;
a capacitor capacitively connecting the electrically conductive surface of the capacitive touch panel to the chassis.

2. The display device of claim 1 , wherein the capacitive touch panel is electrically connected to the chassis substantially only through the capacitive connection.

3. The display device of claim 1 , wherein without said capacitor capacitively connecting, EMI radiation emanates at a level exceeding a government regulation and the capacitance of the capacitor corresponds to the reciprocal of the lowest frequency in radians per second of the EMI radiation.

4. The display device of claim 3 , wherein the capacitive touch panel includes a peripheral edge and the capacitor is formed of a strip of capacitive material disposed along the peripheral edge of the capacitive touch panel.

5. The display device of claim 4 , wherein there are a plurality of capacitors capacitively connecting the capacitive touch panel to the LCD and the combined equivalent capacitance of the capacitors corresponds to the reciprocal of the lowest frequency in radians per second of the EMI radiation.

6. The display device according to claim 1 , wherein the capacitive touch panel includes a peripheral edge and the capacitor corresponds in a cross-section substantially to that of a capital letter U having two legs in which the peripheral edge of the capacitive touch panel is received between the two legs.

7. The display device according to claim 1 , wherein the capacitor has opposing plates spaced apart from one another by a dielectric and one of the plates directly contacts the electrically conductive surface of the capacitive touch panel and the other plate is electrically connected to the chassis.

8. The display device according to claim 7 , wherein the capacitive touch panel is electrically connected to the chassis only through the capacitive connection.

Assignees

• Panasonic Avionics Corp

Inventors

• Ninh Loi Quang
• Wu Vic
• Hsu Wenkai
• Le Curtis

Classifications

• G06F2203/04107

  Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds · CPC title

• G02F1/13338 Primary

  Input devices, e.g. touch panels · CPC title

• G06F3/044 Primary

  by capacitive means · CPC title

• G02F1/133308

  Support structures for LCD panels, e.g. frames or bezels · CPC title

• G02F2001/133334

  Physics · mapped topic