DISPLAY DEVICE AND METHOD OF MANUFACTURING SAME

• US 20100214262A1
• Filed: 02/17/2010
• Published: 08/26/2010
• Est. Priority Date: 02/24/2009
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Ishizaki, Koji, Noguchi, Kouji
• Granted Patent: US 9,459,718 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G02F 1/13306 Circuit arrangements or driving methods for the control of single liquid crystal cells G02F1/132, G02F1/133382 take precedence
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

Disclosed herein is a display device including a substrate, a plurality of pixel electrodes arranged in a form of a matrix in a plane parallel with the substrate, a display functional layer exerting an image display function on a basis of an image signal supplied to the plurality of pixel electrodes, a driving electrode opposed to the plurality of pixel electrodes, and a plurality of detecting electrodes arranged in a form of a plane opposed to the driving electrode, separated and arranged at a pitch of a natural number multiple of an arrangement pitch of the pixel electrodes in one direction in the arrangement plane, and each capacitively coupled with the driving electrode.

Claims

1. A display device comprising:

a substrate;

a plurality of pixel electrodes arranged in a form of a matrix in a plane parallel with said substrate;

a display functional layer exerting an image display function on a basis of an image signal supplied to said plurality of pixel electrodes;

a driving electrode opposed to said plurality of pixel electrodes; and

a plurality of detecting electrodes arranged in a form of a plane opposed to said driving electrode, separated and arranged at a pitch of a natural number multiple of an arrangement pitch of said pixel electrodes in one direction in the arrangement plane, and each capacitively coupled with said driving electrode.

2. The display device according to claim 1,

wherein floating electrodes are arranged between the detecting electrodes in an arrangement of the detecting electrodes, and an arrangement pitch of the detecting electrodes, an arrangement pitch of the floating electrodes, and an arrangement pitch of the detecting electrodes and the floating electrodes are a natural number multiple of the arrangement pitch of said pixel electrodes.

3. The display device according to claim 2,

wherein a color filter layer colored in a different color in each pixel is disposed between a plane of arrangement of said plurality of driving electrodes and a plane of arrangement of said plurality of detecting electrodes;

in said color filter layer, a plurality of color regions including three color regions for RGB display are regularly arranged; and

said detecting electrodes and said floating electrodes are arranged at a natural number multiple of an arrangement pitch of said color regions in at least said one direction.

4. The display device according to claim 3,

wherein the display device has inter-electrode separation regions between said detecting electrodes, between said floating electrodes, and between said detecting electrodes and said floating electrodes, and said inter-electrode separation regions are arranged so as to be superimposed on color regions of an identical color of said color filter layer in a view of a display surface of the display device in at least one of another direction orthogonal to said one direction and said one direction.

5. The display device according to claim 4,

wherein a pseudo inter-electrode separation region is disposed by forming and arranging a plurality of slits shorter than a pixel size at a position of one of said detecting electrodes and said floating electrodes, a repetitive pattern pitch of said inter-electrode separation regions not being constant at said position.

6. The display device according to claim 5,

wherein said pseudo inter-electrode separation region including said slits and inter-electrode separation regions not including said slits are arranged so as to be superimposed on color regions of an identical color of said color filter layer in a view of a display surface of the display device.

7. The display device according to claim 6,

wherein said display device is a liquid crystal display device,

the liquid crystal display device including

a first substrate on which said pixel electrodes are arranged,

a second substrate opposed to said first substrate, and

a liquid crystal layer as said display functional layer filled in between said first substrate and said second substrate,

said driving electrode and said color filter layer being arranged between said first substrate and said second substrate, and

said plurality of detecting electrodes being arranged on an anti-liquid crystal layer side of one of said first substrate and said second substrate.

8. The display device according to claim 7,

wherein said plurality of detecting electrodes are arranged on a third substrate, and

the third substrate on which the detecting electrodes are arranged is fixed to a surface on the anti-liquid crystal side of one of said first substrate and said second substrate via an adhesive layer.

9. The display device according to claim 8, further comprising:

a plurality of driving electrodes arranged in a form of a plane opposed to said plurality of pixel electrodes and separated and arranged at a pitch of a natural number multiple of the arrangement pitch of said pixel electrodes in said other direction; and

a driving circuit for supplying said plurality of driving electrodes with a voltage serving as a reference for a voltage applied to said display functional layer and a driving voltage for detecting that magnitude of capacitances coupled with said plurality of detecting electrodes changes at a part of the detecting electrodes by selectively applying the driving voltage to each unit of a predetermined number of driving electrodes among said plurality of driving electrodes and shifting selected and driven objects of the driving electrodes in said other direction.

10. The display device according to claim 2,

wherein width of said detecting electrodes and width of said floating electrodes in said one direction are equivalent to each other.

11. The display device according to claim 2,

wherein said floating electrodes are arranged in a form of a lattice.

12. The display device according to claim 4, further comprising:

a plurality of driving electrodes arranged in a form of a plane opposed to said plurality of pixel electrodes and separated and arranged at a pitch of a natural number multiple of the arrangement pitch of said pixel electrodes in said other direction orthogonal to said one direction; and

a driving circuit for supplying said plurality of driving electrodes with a voltage serving as a reference for a voltage applied to said display functional layer and a driving voltage for detecting that magnitude of capacitances coupled with said plurality of detecting electrodes changes at a part of the detecting electrodes by selectively applying the driving voltage to each unit of a predetermined number of said driving electrodes among said plurality of driving electrodes and shifting selected and driven objects of the driving electrodes in said other direction.

13. The display device according to claim 7,

wherein a polarizer is disposed between said plurality of detecting electrodes and a surface on the anti-liquid crystal side of one of said first substrate and said second substrate.

14. A method of manufacturing a display device, said method comprising the steps of:

forming a plurality of pixel electrodes on a first substrate;

forming a driving electrode on one of said first substrate and a second substrate;

forming a plurality of detecting electrodes on one of said second substrate and another substrate; and

filling a liquid crystal between said first substrate and said second substrate;

wherein the step of forming said plurality of detecting electrodes further includes the steps of

forming a transparent electrode layer, and

dividing said transparent electrode layer by simultaneously forming said plurality of detecting electrodes arranged in a form of a plane opposed to said driving electrode and having a pattern separated in one direction in the plane of arrangement and a plurality of floating electrodes arranged between the detecting electrodes in an arrangement of the detecting electrodes.

15. The method of manufacturing the display device according to claim 14,

wherein in the step of dividing said transparent electrode layer, said transparent electrode layer is patterned such that an arrangement pitch of said detecting electrodes, an arrangement pitch of said floating electrodes, and an arrangement pitch of said detecting electrodes and said floating electrodes are a natural number multiple of an arrangement pitch of said pixel electrodes in said one direction.