Touch screen display with electric field shielding layer

• US 8,525,797 B2
• Filed: 01/15/2008
• Issued: 09/03/2013
• Est. Priority Date: 11/09/2007
• Status: Active Grant

• Current Assignee: TPK Touch Solutions (Xiamen) Inc. (TPK Holding Co., Ltd.)
• Original Assignee: TPK Touch Solutions (Xiamen) Inc. (TPK Holding Co., Ltd.)
• Inventors: Liu, Chen-Yu, Chien, Shun-Ta
• Primary Examiner(s): Wang, Quan-Zhen
• Assistant Examiner(s): DAVIS, TONY O
• Application Number:
  US12/007,715
• Publication Number:
  US 20090122021A1
• Time in Patent Office: 2,058 Days
• Field of Search: 345/173
• US Class Current: 345/173
• CPC Class Codes: G02F 1/133302 Rigid substrates, e.g. inorganic substrates
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• 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 3/044 by capacitive means

Abstract

Disclosed is a touch screen display with an electric field shielding layer arranged between a liquid crystal layer of an LCD device and a glass substrate, having a touch sensing layer arranged on a top surface thereof, so that the electric field shielding layer isolates signal interference between the touch sensing layer and the liquid crystal layer.

Claims

1. A touch screen display, comprising:

a first glass substrate;

a second glass substrate;

a liquid crystal layer arranged between the first and the second glass substrate;

a first polarizing plate arranged to a bottom surface of the first glass substrate opposite to the liquid crystal layer;

a liquid crystal driving electrode layer formed between the first glass substrate and the liquid crystal layer, and including a plurality of horizontally staggered pixel electrodes and common electrodes for driving the liquid crystal layer;

a color filter layer formed on a bottom surface of the second glass substrate facing toward the liquid crystal layer;

a second polarizing plate arranged on a top surface of the second glass substrate opposite to the liquid crystal layer;

a touch sensing layer formed between the second glass substrate and the second polarizing plate for sensing a touch signal when a pressure is applied against the touch sensing layer; and

an electric field shielding layer with a transparent continuous plane structure arranged between the second glass substrate and the liquid crystal layer and electrically connected to a predetermined potential for isolating signal interference between the touch sensing layer and the liquid crystal layer.

2. The touch screen display as claimed in claim 1, wherein the electric field shielding layer with the transparent continuous plane structure is arranged between the color filter layer and the second glass substrate.

3. The touch screen display as claimed in claim 1, wherein the electric field shielding layer with the transparent continuous plane structure is arranged between the color filter layer and the liquid crystal layer.

4. The touch screen display as claimed in claim 1, further comprising an over-coating layer arranged between the liquid crystal layer and the color filter layer, and the electric field shielding layer with the transparent continuous plane structure being located between the color filter layer and the over-coating layer.

5. touch screen display as claimed in claim 1, wherein the electric field shielding layer with the transparent continuous plane structure is electrically connected to a zero voltage as the predetermined potential.

6. The touch screen display as claimed in claim 1, wherein the electric field shielding layer with the transparent continuous plane structure is electrically connected to a floating voltage as the predetermined potential.

7. A touch screen display, comprising:

a first glass substrate;

a second glass substrate;

a liquid crystal layer arranged between the first and the second glass substrate;

a first polarizing plate arranged to a bottom surface of the first glass substrate opposite to the liquid crystal layer;

a pixel electrode layer, which comprises a plurality of pixel electrodes and is arranged to a bottom surface of the liquid crystal layer;

a common electrode layer, which comprises a plurality of common electrodes corresponding to the plurality of pixel electrodes, the common electrode layer and the and the pixel electrode layer together forming, a liquid crystal driving, electrode layer for driving liquid crystal molecules of the liquid crystal layer;

a color filter layer for surface of the second glass substrate facing toward the liquid crystal layer;

a second polarizing plate arranged on a top surface of the second glass substrate opposite to the liquid crystal layer;

a touch sensing layer formed between the second glass substrate and the second polarizing plate for sensing a touch signal when a pressure is applied against the touch sensing layer; and

an electric field shielding layer with a transparent continuous plane structure arranged between the second glass substrate and the common electrode layer and electrically connected to a predetermined potential for isolating signal interference between the touch sensing layer and the liquid crystal layer.

8. The touch screen display as claimed in claim 7, wherein the electric field shielding layer with the transparent continuous plane structure is arranged between the color filter layer and the second glass substrate.

9. The touch screen display as claimed in claim 7, wherein the electric field shielding layer with the transparent continuous plane structure is arranged between the color filter layer and the common electrode layer, and an insulating layer is further provided between the electric field shielding layer with the transparent continuous plane structure and the common electrode layer.

10. The touch screen display as claimed in claim 7, wherein the electric field shielding layer with the transparent continuous plane structure is electrically connected to a zero voltage as the predetermined potential.

11. The touch screen display as claimed in claim 7, wherein the electric field shielding layer with the transparent continuous plane structure is electrically connected to a floating voltage as the predetermined potential.