PLASMA DISPLAY PANEL AND FIELD EMISSION DISPLAY

• US 20080129184A1
• Filed: 12/05/2007
• Published: 06/05/2008
• Est. Priority Date: 12/05/2006
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: EGI, Yuji, NISHI, Takeshi, YAMAZAKI, Shunpei, NISHIDA, Jiro
• Granted Patent: US 8,164,245 B2
• Time in Patent Office: Days
• US Class Current: 313/484
• CPC Class Codes: H01J 11/12 with main electrodes provided on both sides of the discharge space
• CPC Class Codes: H01J 11/44 Optical arrangements or shielding arrangements, e.g. filters, black matrices, light reflecting means or electromagnetic shielding means
• CPC Class Codes: H01J 2211/442 Light reflecting means; Anti-reflection means
• CPC Class Codes: H01J 2211/444 Means for improving contrast or colour purity, e.g. black matrix or light shielding means
• CPC Class Codes: H01J 2329/892 Anti-reflection, anti-glare, viewing angle and contrast improving means
• CPC Class Codes: H01J 29/86 Vessels; Containers; Vacuum locks
• CPC Class Codes: H01J 31/127 using large area or array sources, i.e. essentially a source for each pixel group

Abstract

It is an object to provide a plasma display and a field emission display that each have high visibility and an anti-reflection function that can further reduce reflection of incident light from external. Reflection of light can be prevented by having an anti-reflection layer that geometrically includes a plurality of adjacent pyramidal projections. In addition, a plurality of hexagonal pyramidal projections, each of which is provided with a protective layer formed of a material having a lower refractive index than a refractive index of the pyramidal projection so as to fill a space among the plurality of pyramidal projections, can be provided to be packed together without any spaces. Further, six sides of a pyramidal projection face different directions with respect to a base. Therefore, light can be diffused in many directions efficiently.

Claims

1. A plasma display comprising:

a pair of substrates;

at least a pair of electrodes provided between the pair of substrates;

a phosphor layer provided between the pair of electrodes; and

an anti-reflection layer provided on an outer side of one substrate of the pair of substrates,

wherein the one substrate has a light-transmitting property,

wherein the anti-reflection layer comprises a plurality of pyramidal projections,

wherein each side of a base of one of the plurality of pyramidal projections is in contact with one side of a base of another pyramidal projection, and

wherein a space among the plurality of pyramidal projections is filled with a protective layer having a lower refractive index than a refractive index of the plurality of pyramidal projections.

2. A plasma display according to claim 1,

wherein apexes of the plurality of pyramidal projections are arranged at an equal distance.

3. A plasma display according to claim 1, wherein each of the plurality of pyramidal projections has a hexagonal pyramidal shape.

4. The plasma display according to claim 2, wherein a distance between the apexes of the plurality of pyramidal projections is 350 nm or less and a height of the plurality of pyramidal projections is 800 nm or higher.

5. The plasma display according to claim 3, wherein a filling factor of bases of the plurality of hexagonal pyramidal projections per unit area is 80% or more.

6. The plasma display according to claim 3,

wherein a first vertex of a hexagonal base of one of the plurality of hexagonal pyramidal projections is in contact with a first vertex of a hexagonal base of an adjacent hexagonal pyramidal projection, and

wherein a second vertex of the hexagonal base of the one of the plurality of hexagonal pyramidal projections is in contact with a second vertex of the hexagonal base of the adjacent hexagonal pyramidal projection.

7. A field emission display comprising:

a first substrate;

an electron-emission element over the first substrate;

a phosphor layer over the electron-emission element; and

an electrode over and in contact with the phosphor layer;

an anti-reflection layer provided over the second substrate,

wherein the second substrate has a light-transmitting property,

wherein the anti-reflection layer comprises a plurality of pyramidal projections,

wherein each side of a base of one of the plurality of pyramidal projections is in contact with one side of a base of another pyramidal projection, and

wherein a space among the plurality of pyramidal projections is filled with a protective layer having a lower refractive index than a refractive index of the plurality of pyramidal projections.

8. A field emission display according to claim 7,

wherein apexes of the plurality of pyramidal projections are arranged at an equal distance.

9. A field emission display according to claim 7, wherein each of the plurality of pyramidal projections has a hexagonal pyramidal shape.

10. The field emission display according to claim 8, wherein a distance between the apexes of the plurality of pyramidal projections is 350 nm or less and a height of the plurality of pyramidal projections is 800 nm or higher.

11. The field emission display according to claim 9, wherein a filling factor of bases of the plurality of hexagonal pyramidal projections per unit area is 80% or more.

12. The plasma display according to claim 9,

wherein a first vertex of a hexagonal base of one of the plurality of hexagonal pyramidal projections is in contact with a first vertex of a hexagonal base of an adjacent hexagonal pyramidal projection, and

wherein a second vertex of the hexagonal base of the one of the plurality of hexagonal pyramidal projections is in contact with a second vertex of the hexagonal base of the adjacent hexagonal pyramidal projection.