Reflection suppression segment having inclined surfaces, display, and method for verifying display

Patent metadata

Field	Value
Publication number	US-11428852-B2
Application number	US-202016751176-A
Country	US
Kind code	B2
Filing date	Jan 23, 2020
Priority date	Jul 28, 2017
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

A dielectric layer comprising an embossed surface and a flat surface which is located at a side opposite to the embossed surface is provided. The plane that approximates the flat surface is the X-Y plane, and the normal direction to the X-Y plane is the Z direction. The embossed surface has inclined surfaces that are inclined with respect to the Z direction, and the inclined surfaces reflect incident light incident on the dielectric layer and emerge reflected light. The elevation angle, which is an angle between the inclined surface and the X-Y plane, is α. The refractive index of the dielectric layer is n. These values satisfy Formula (1): sin α≤(1/n)<sin 2α.

First claim

What is claimed is:

1. A reflection suppression segment provided with a dielectric layer, comprising:
an embossed surface and a flat surface which is on a side opposite to the embossed surface, wherein:
a plane that approximates the flat surface is an X-Y plane;
a normal direction to the X-Y plane is a Z direction;
the embossed surface has inclined surfaces that are inclined with respect to the Z direction;
the inclined surfaces reflect incident light incident on the dielectric layer and emerge reflected light; and
an elevation angle, which is an angle between the inclined surface and the X-Y plane, is α, and a refractive index of the dielectric layer is n, which satisfy Formula (1): sin α≤(1/n)<sin 2α, wherein the reflection suppression segment is further provided with a reflection layer on the inclined surfaces and wherein the reflection layer comprises at least one of a metal, a metal alloy, a metal sulfide, a metal oxide, and a metal fluoride and wherein the reflection layer covers the embossed surface entirely and wherein a thickness of the reflection layer on portions of the embossed layer, which are other than the inclined surfaces, is thinner than a thickness of the reflection layer on the inclined surfaces.

2. The reflection suppression segment of claim 1 , wherein:
the refractive index of the dielectric layer is more than 1.0 and 2.0 or less.

3. The reflection suppression segment of claim 1 , wherein:
the dielectric layer is a first dielectric layer;
the reflection suppression segment is further provided with a second dielectric layer covering the embossed surface of the first dielectric layer; and
a surface opposite to the embossed surface in the second dielectric layer is flat.

4. The reflection suppression segment of claim 1 , wherein the reflection layer comprises a metal or a metal alloy.

5. The reflection suppression segment of claim 1 , wherein the reflection layer comprises a metal.

6. The reflection suppression segment of claim 5 , wherein the metal is selected from aluminum, gold, silver, platinum, nickel, tin, chromium, and zirconium.

7. The reflection suppression segment of claim 1 , wherein the reflection layer comprises a metal sulfide.

8. The reflection suppression segment of claim 1 , wherein the reflection layer comprises a metal oxide.

9. The reflection suppression segment of claim 1 , wherein the reflection layer comprises a metal fluoride.

10. The reflection suppression element of claim 1 , wherein the reflection layer is a multilayer.

11. The reflection suppression element of claim 1 , wherein the reflection layer is a single layer.

12. A display provided with a plurality of reflection suppression segments, wherein:
each reflection suppression segment is the reflection suppression segment of claim 1 ;
the plurality of reflection suppression segments share a dielectric layer, the flat surface of each reflection suppression segment is included in a flat surface in the dielectric layer, and the embossed surface of each reflection suppression segment is included in a embossed surface in the dielectric layer;
when the display is observed from a predetermined fixed point located on a side of the flat surface of the dielectric layer facing away from the embossed surface of the dielectric layer, and located in an oblique direction with respect to the flat surface of the dielectric layer, the plurality of reflection suppression segments includes the reflection suppression segments having different brightness of reflected light from one another.

13. A method of verifying the display of claim 12 , comprising:
observing the display in a state of stacking a diffuser on the flat surface of the display; and
observing the display in a state of not stacking the diffuser on the flat surface of the display.

14. The display of claim 12 , wherein:
the plurality of reflection suppression segments have different elevation angles from one another, and thereby, when the display is observed from the fixed point, the brightness between the reflection suppression segments are different.

15. The display of claim 14 , wherein:
the display comprises three or more of the reflection suppression segments arranged along one direction; and
a difference obtained by subtracting an elevation angle of an (n+1)th reflection suppression segment from an elevation angle of an nth reflection suppression segment is a predetermined value.

16. The display of claim 12 , wherein:
a direction defined by projecting a normal direction of the inclined surfaces onto the X-Y plane is an azimuth direction;
an angle formed between the azimuth direction and a reference direction in the X-Y plane is an azimuth angle; and
the plurality of reflection suppression segments have different azimuth angles, and thereby, when the display is observed from the fixed point, the brightness is different between the reflection suppression segments.

17. The display of claim 16 , wherein:
the display comprises three or more of the reflection suppression segments arranged along one direction; and
a difference obtained by subtracting an azimuth angle of an (n+1)th reflection suppression segment from an azimuth angle of an nth reflection suppression segment is of a predetermined value.

Assignees

• Toppan Printing Co Ltd

Inventors

• Endo Hiroyuki
• Toda Toshiki

Classifications

• B42D25/22

  for use in combination with accessories specially adapted for information-bearing cards · CPC title

• G09F2003/0276

  Safety features, e.g. colour, prominent part, logo · CPC title

• G02B5/0215 Primary

  the surface having a regular structure · CPC title

• G02B5/0284

  used in reflection · CPC title

• G09F3/02

  Forms or constructions (layered products B32B) · CPC title