Display apparatus

• US 8,456,444 B2
• Filed: 02/11/2010
• Issued: 06/04/2013
• Est. Priority Date: 03/04/2009
• Status: Expired due to Fees

• Current Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Original Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Inventors: Ishizaki, Koji, Noguchi, Koji
• Primary Examiner(s): Zhou, Hong
• Application Number:
  US12/704,242
• Publication Number:
  US 20100225612A1
• Time in Patent Office: 1,209 Days
• Field of Search: 345173-174, 178 1801- 1806
• US Class Current: 345/174
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

A display apparatus includes: a first and second substrates disposed in an opposing relationship to each other; a plurality of pixel electrodes disposed adjacent the first substrate; a displaying function layer exhibits an image displaying function based on an image signal supplied to the pixel electrodes; a driving electrode disposed in an opposing relationship to the pixel electrodes adjacent one of the two faces; a plurality of detection electrodes disposed on a face of the second substrate on the opposite side to the driving electrode and separated from each other in one direction so as to cooperate with the driving electrode to form capacitance therebetween; and an electrode neighboring layer disposed in contact with the second substrate and the detection electrodes and covering the detection electrodes; the electrode neighboring layer having a refractive index within a range from that of the second substrate to that of the detection electrodes.

Claims

1. A display apparatus, comprising:

a first substrate and a second substrate disposed in an opposing relationship to each other;

a plurality of pixel electrodes disposed adjacent one of two mutually opposing faces of said first and second substrates, with the one being of said first substrate;

a displaying function layer adapted to exhibit an image displaying function based on an image signal supplied to said pixel electrodes;

a driving electrode disposed in an opposing relationship to said pixel electrodes adjacent one of the two faces of said first and second substrates;

a plurality of detection electrodes disposed on a face of said second substrate on the opposite side to said driving electrode and separated from each other in one direction so as to cooperate with said driving electrode to form capacitance therebetween; and

an electrode neighboring layer disposed in contact with said second substrate and said detection electrodes and covering said detection electrodes;

said electrode neighboring layer having a refractive index within a range from a refractive index equal to that of said second substrate to a refractive index equal to that of said detection electrodes, wherein, where a wavelength when a refractive index is defined is 550 nm, the refractive index of said electrode neighboring layer is within a range defined by −

21% to +14% of the magnitude of the entire refractive index difference from the center of the refractive index difference between the refractive index of said second substrate and the refractive index of said detection electrode.

2. The display apparatus according to claim 1, wherein a refractive index na of said electrode neighboring layer has such a relationship to a refractive index np of said detection electrode and a refractive index ns of said second substrate as is given, where a wavelength when a refractive index is defined is 550 nm, by the following expression (1):

where np≦

ns,np≦

na≦

ns

where np>

ns,np≧

na>

ns 

 

(1).

3. The display apparatus according to claim 1, wherein, where a wavelength when a refractive index is defined is 550 nm, the refractive index of said electrode neighboring layer is a middle value between the refractive index of said second substrate and the refractive index of said detection electrodes.

4. The display apparatus according to claim 1, wherein, where a wavelength when a refractive index is defined is 550 nm, the refractive index of said electrode neighboring layer is within a range defined from −

14% to +7% of the magnitude of the entire refractive index difference from the center of the refractive index difference between the refractive index of said second substrate and the refractive index of said detection electrode.

5. The display apparatus according to claim 1, wherein said electrode neighboring layer is a bonding layer which adheres a polarizing plate or an optical functional layer including a polarizing plate to the face of said second substrate on which said detection electrodes are disposed.

6. The display apparatus according to claim 5, wherein said bonding layer is made of a compound containing one of silicon oxide and silicon nitride.

7. The display apparatus according to claim 1, wherein said electrode neighboring layer is formed from an orientation film provided as a ground layer of a coating type polarization material.

8. The display apparatus according to claim 1, wherein said electrode neighboring layer is a protective layer for protecting said detection electrodes.

9. The display apparatus according to claim 8, wherein said protective layer is made of one of silicon oxide and silicon nitride.

10. The display apparatus according to claim 8, wherein said protective layer is made of a compound containing one of silicon oxide and silicon nitride.

11. The display apparatus according to claim 1, wherein the area of a region in which said detection electrodes do not contact with the face of said second substrate in an effective display region of the face of said second substrate with which said detection electrodes contact is 20% or less of the effective displaying region.

12. The display apparatus according to claim 1, further comprising

a detection circuit capable of detecting a voltage variation through each of said detection electrodes.

13. The display apparatus according to claim 1, wherein said driving electrode is separated into a plurality of driving electrodes in a direction perpendicular to the separation disposition direction of said detection electrodes;

said display apparatus further comprising

a driving circuit for supplying a voltage to be used as a reference to a voltage to be applied to said displaying functional layer and a driving voltage for being used to detect that the capacitance exhibits a variation at some of said detection electrodes to said driving electrodes.

14. The display apparatus according to claim 1, wherein said display apparatus is a liquid crystal display apparatus having a liquid crystal layer as said displaying functional layer inserted between said first substrate and said second substrate.

15. The display apparatus according to claim 1, wherein the electrode neighboring layer is a bonding layer and a polarizing plate.

16. A display apparatus, comprising:

a first substrate and a second substrate disposed in an opposing relationship to each other;

a plurality of pixel electrodes disposed adjacent one of two mutually opposing faces of said first and second substrates, with the one being of said first substrate;

a displaying function layer adapted to exhibit an image displaying function based on an image signal supplied to said pixel electrodes;

a driving electrode disposed in an opposing relationship to said pixel electrodes adjacent one of the two faces of said first and second substrates;

a plurality of detection electrodes disposed on a face of said second substrate on the opposite side to said driving electrode and separated from each other in one direction so as to cooperate with said driving electrode to form capacitance therebetween; and

an electrode neighboring layer disposed in contact with said second substrate and said detection electrodes and covering said detection electrodes;

said electrode neighboring layer having a refractive index within a range from a refractive index equal to that of said second substrate to a refractive index equal to that of said detection electrodes, wherein said detection electrodes have an opening for exposing therethrough a pixel region to which a single color or a plurality of colors are allocated.

17. The display apparatus according to claim 16, wherein the opening is formed at each position of said detection electrodes for exposing a blue pixel region.

18. A display apparatus, comprising:

a first substrate and a second substrate disposed in an opposing relationship to each other;

a plurality of pixel electrodes disposed adjacent one of two mutually opposing faces of said first and second substrates, with the one being of said first substrate;

a displaying function layer adapted to exhibit an image displaying function based on an image signal supplied to said pixel electrodes;

a driving electrode disposed in an opposing relationship to said pixel electrodes adjacent one of the two faces of said first and second substrates;

a plurality of detection electrodes disposed on a face of said second substrate on the opposite side to said driving electrode and separated from each other in one direction so as to cooperate with said driving electrode to form capacitance therebetween; and

a protective layer disposed in contact with said second substrate and said detection electrodes and covering said detection electrodes;

a refractive index no of said protective layer having such a relationship to a refractive index np of said detection electrode and a refractive index ns of said second substrate as is given, where a wavelength when a refractive index is defined is 660 nm, by the following expression (2);

where np≦

ns,np≦

no≦

s

where np>

ns,np≧

no>

ns 

 

(2), and further

wherein, where a wavelength when a refractive index is defined is 550 nm, the refractive index of said electrode neighboring layer is within a range defined by −

21% to +14% of the magnitude of the entire refractive index difference from the center of the refractive index difference between the refractive index of said second substrate and the refractive index of said detection electrode.

19. The display apparatus according to claim 18, wherein the refractive index of the protective layer is within a range defined to be from −

14% to +7% of a magnitude of the entire refractive index difference from a center of the refractive index difference between the refractive index ns of said second substrate and the refractive index np of said detection electrode.