Display having light-scattering property

Patent metadata

Field	Value
Publication number	US-8982465-B2
Application number	US-80163510-A
Country	US
Kind code	B2
Filing date	Jun 17, 2010
Priority date	Apr 18, 2008
Publication date	Mar 17, 2015
Grant date	Mar 17, 2015

Abstract

A display includes light-scattering regions. Each of the light-scattering regions is provided with linear protrusions and/or recesses having the same longitudinal direction. The light-scattering regions are different from each other in the longitudinal direction.

First claim

What is claimed is:

1. A display comprising:
a first light-scattering region provided with first linear protrusions or recesses having the same longitudinal direction and each configured to emit white scattered light in a plane perpendicular to the longitudinal direction when illuminated with white light in a direction normal to the first light-scattering region, the first linear protrusions or recesses being discontinuous in the longitudinal direction thereof; and
a second light-scattering region provided with second linear protrusions or recesses having the same longitudinal direction different from the longitudinal direction of the first linear protrusions or recesses and configured to emit white scattered light in a plane perpendicular to the longitudinal direction of the second linear protrusions or recesses when illuminated with white light in a direction normal to the second light scattering region, the second linear protrusions or recesses being discontinuous in the longitudinal direction thereof,
wherein the first light-scattering region forms an image and the second light-scattering region forms a marginal part of the image, the marginal part of the image extending along the entire perimeter of the image formed by the first light-scattering region,
wherein in at least one of the first and second light-scattering regions, the linear protrusions or recesses are arranged at random,
wherein the first light-scattering region includes an array of cells, each provided with the first protrusions or recesses
wherein the second light-scattering region includes an array of cells, each provided with the second protrusions or recesses, and
wherein in at least one of the first and second light-scattering regions, the cells included in the light-scattering region include first and second cells different from each other in at least one of length and width of the protrusions or recesses, the first and second cells being configured to emit the scattered light at first and second degrees of divergence, respectively, such that an image informed by the first and second cells is seen as an image with light and shade.

2. The display according to claim 1 , wherein the display comprises the first and second light-scattering regions in the same plane.

3. The display according to claim 1 , wherein the image formed by the first light-scattering region and the marginal part of the image formed by the second light-scattering region are distinguishable from each other with an unaided eye.

4. The display according to claim 1 , wherein in each of the first and second light-scattering regions, the linear protrusions or recesses are arranged at random.

5. The display according to claim 1 , wherein in at least one of the first and second light-scattering regions, the linear protrusions or recesses have the same length and width.

6. The display according to claim 1 , wherein in at least one of the first and second light-scattering regions, an average interval among the protrusion or recesses is equal to or smaller than 10 μm.

7. The display according to claim 1 , wherein the longitudinal direction in the first light-scattering region and the longitudinal direction in the second light-scattering region are orthogonal to each other.

8. The display according to claim 1 , further comprising a diffraction grating region provided with a relief structure which forms a diffraction grating.

9. The display according to claim 8 , wherein each of the first and second light-scattering regions includes an array of cells each provided with the protrusions or recesses, and
the diffraction grating region includes an array of cells each provided with the relief structure.

10. The display according to claim 9 , wherein in at least one of the first and second light-scattering regions, the cells included in the light-scattering region include cells different in at least one of density, size, shape, and depth or height of the protrusions or recesses, and an area ratio of a portion provided with the protrusions or recesses with respect to the cell, and
the cells included in the diffraction grating region include cells different in at least one of spatial frequency, orientation, and depth or height of grooves forming the diffraction grating, and an area ratio of the diffraction grating with respect to the cell.

11. The display according to claim 1 , further comprising a light-scattering region provided with protrusions or recesses having planar shapes of circles, ellipses or polygons.

12. The display according to claim 1 , wherein the first and second light scattering regions are regions included in a main surface of a layer made of a light-transmitting material, and the display further comprises a reflective layer or a semitransparent reflective layer covering the main surface.

13. A labeled article comprising:
the display according to claim 1 ; and
an article supporting the display.

14. A display comprising:
a first light scattering region provided with first linear protrusions or recesses having the same longitudinal direction and each configured to emit white scattered light in a plane perpendicular to the longitudinal direction when illuminated with white light in a direction normal to the first light-scattering region, the first linear protrusions or recesses being discontinuous in the longitudinal direction thereof; and
a second light-scattering region provided with second linear protrusions or recesses having the same longitudinal direction different from the longitudinal direction of the first linear protrusions or recesses and configured to emit white scattered light in a plane perpendicular to the longitudinal direction of the second linear protrusions or recesses when illuminated with white light in a direction normal to the second light-scattering region, the second linear protrusions or recesses being discontinuous in the longitudinal direction thereof,
wherein the first light-scattering region forms an image and the second light-scattering region forms a marginal part of the image,
wherein in at least one of the first and second light-scattering regions, the linear protrusions or recesses are arranged at random,
wherein the first light-scattering region includes an array of cells each provided with the first protrusions or recesses,
wherein the second light-scattering region includes an array of cells each provided with the second protrusions or recesses, and
wherein in at least one of the first and second light-scattering regions, the cells included in the light-scattering region include first and second cells different from each other in at least one of length and width of the protrusions or recesses, the first and second cells being configured to emit the scattered light at first and second degrees of divergence, respectively, such that an image formed by the first and second cells is seen as an image with light and shade.

15. The display according to claim 14 , wherein the image formed by the first light-scattering region and the marginal part of the image formed by the second light-scattering region are distinguishable from each other with an unaided eye.

Assignees

• Toda Toshiki
• Toppan Printing Co Ltd

Inventors

• Toda Toshiki

Classifications

• G02B5/18

  Diffraction gratings {(holographic optical elements G02B5/32, G03H; integrally combined with optical fibres G02B6/02057; for coupling light guides G02B6/34; integrally combined with optical integrated light guides G02B6/12; grating systems G02B27/44)} · CPC title

• B42D25/24

  Passports · CPC title

• B42D25/328

  Diffraction gratings; Holograms · CPC title

• B42D25/29

  Securities; Bank notes · CPC title

• B42D25/425

  by deformation, e.g. embossing · CPC title