Mother substrate, light-control member, method for manufacturing light-control member, and display device

Patent metadata

Field	Value
Publication number	US-10036837-B2
Application number	US-201415033684-A
Country	US
Kind code	B2
Filing date	Nov 7, 2014
Priority date	Nov 8, 2013
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

A light-control member ( 13 ) includes a substrate ( 39 ); light-shielding layers ( 40 ) provided in a first area (A 1 ) on one surface ( 39 a ) of the substrate ( 39 ); a light-diffusion section ( 41 ) provided in an area other than the light-shielding layers ( 40 ) in the first area (A 1 ) and formed of light transmitting material; and a support section( 45 ) provided in a second area (A 2 ) positioned on an outer side of the first area (A 1 ) on the one surface ( 39 a ), in which the light-diffusion section ( 41 ) has a light emitting end surface ( 41 a ) in contact with the one surface ( 39 a ) of the substrate ( 39 ), a light incident end surface ( 41 b ) opposing the light emitting end surface ( 41 a ) and having an area greater than an area of the light emitting end surface ( 41 a ), and a reflective surface ( 41 c ) which is in contact with the light emitting end surface ( 41 a ) and the light incident end surface ( 41 b ) and on which light incident from the light incident end surface ( 41 b ) is reflected, and a formation area of the support section ( 45 ) per unit area in the second area (A 2 ) is greater than a formation area of the support section ( 45 ) per unit area in the first area (A 1 ).

First claim

The invention claimed is:

1. A mother substrate, comprising:
a first substrate having light transmissivity and including a light-control member formation area;
first light-shielding layers provided in a first area in the light-control member formation area;
a plurality of light-diffusion sections provided in an area other than the first light-shielding layers and formed of light transmitting material; and
the light transmitting material provided in a second area positioned on an outer side of the first area in the light-control member formation area, wherein
each of the plurality of light-diffusion sections includes a light emitting end surface positioned at one end of a first surface side of the first substrate, a light incident end surface opposing the light emitting end surface and having an area greater than an area of the light emitting end surface, and a reflective surface which is in contact with the light emitting end surface and the light incident end surface and on which light incident from the light incident end surface is reflected,
a formation area of the light transmitting material per unit area in the second area is greater than a formation area of the light transmitting material per unit area in the first area, and
a third area in which neither the first light-shielding layers nor the light transmitting material is present is provided on an outer side of the second area on a first surface of the first substrate.

2. The mother substrate according to claim 1 , wherein
second light-shielding layers are provided in the second area, and
the second light-shielding layers have a UV transmission rate that is greater than a UV transmission rate of the first light-shielding layers.

3. The mother substrate according to claim 1 , wherein a width in a planar view of the light transmitting material provided in the second area is wider than an arrangement interval between the first light-shielding layers.

4. The mother substrate according to any one of claim 1 , wherein
second light-shielding layers are provided in the second area, and
a size in a planar view of each of the second light-shielding layers provided is smaller than a size in the planar view of each of the first light-shielding layers.

5. The mother substrate according to claim 1 , wherein the first light-shielding layers are provided only in the first area.

6. The mother substrate according to claim 1 , wherein a periphery of the first area is surrounded by the second area.

7. The mother substrate according to claim 1 , wherein
a second substrate is arranged opposing the first surface of the first substrate with the light transmitting material therebetween, and
an elastic member is arranged between the light transmitting material and the second substrate.

8. A light-control member, comprising:
a first substrate having light transmissivity;
light-shielding layers provided in a first area on a first surface of the first substrate;
a light-diffusion section provided in an area other than the light-shielding layers and formed of light transmitting material; and
the light transmitting material provided in a second area positioned on an outer side of the first area on the first surface, wherein
the light-diffusion section includes a light emitting end surface in contact with the first surface of the first substrate, a light incident end surface opposing the light emitting end surface and having an area greater than an area of the light emitting end surface, and a reflective surface which is in contact with the light emitting end surface and the light incident end surface and on which light incident from the light incident end surface is reflected,
a formation area of the light transmitting material per unit area in the second area is greater than a formation area of the light transmitting material per unit area in the first area, and
a third area in which neither the light-shielding layers nor the light transmitting material is present is provided on an outer side of the second area on a first surface of the first substrate.

9. A light-control member manufacturing method for manufacturing a plurality of light-control members from a mother substrate having a plurality of light-control member formation areas on a first surface of a first substrate, the light-control member manufacturing method comprising:
forming light-shielding layers in a first area of the first surface;
forming a photosensitive resin layer in the first area in which the light-shielding layers are formed and a second area positioned on an outer side of the first area;
radiating light from a second surface side opposite to the first surface of the first substrate and exposing the photosensitive resin layer to light by using the light-shielding layers as a mask;
developing the photosensitive resin layer to thereby form a light-diffusion section in the first area and form a light transmitting material in the second area; and
cutting off the first substrate for each of the light-control member formation areas to obtain the plurality of light-control members, wherein
while forming the light transmitting material and the light-diffusion section simultaneously, the forming is performed such that a formation area of the light transmitting material per unit area in the second area is greater than a formation area of the light transmitting material per unit area in the first area, and
a third area in which neither the light-shielding layers nor the light transmitting material is present is provided on an outer side of the second area on the first surface of the first substrate.

10. The light-control member manufacturing method according to claim 9 , wherein the first substrate is cut off in the second area.

11. The light-control member manufacturing method according to claim 9 , wherein
the first substrate is fed by a roll-to-roll process, and
the photosensitive resin layer is formed on an inner side of both ends in a direction perpendicular to a feeding direction of the first substrate.

12. A display device, comprising:
a display body which receives an input signal and outputs a video image; and
a light-control member which is provided on a viewing side of the display body and diffuses and outputs light incident from the display body, wherein
the light control member is formed of the light-control member according to claim 9 , and
the light-control member is provided such that a first area in which the light diffusion section is formed is positioned in a display area of the display body and a second area in which the light transmitting material is formed is positioned in an area other than the display area.

13. The display device according to claim 12 , wherein
the light-control member is configured to have anisotropic scattering characteristics, and
an azimuthal direction in which a luminance viewing angle of the display body is relatively narrow and an azimuthal direction in which diffusivity of the light-control member is relatively strong substantially coincide with each other.

14. The mother substrate according to claim 2 , wherein a density of formation of the second light-shielding layers is less than a density of formation of the first light-shielding layers.

15. The mother substrate according to claim 2 , wherein a film thickness of the second light-shielding layers is thinner than a film thickness of the first light-shielding layers.

16. The mother substrate according to claim 1 , wherein
the first area has a rectangular shape,
the second area has a rectangular opening-shape that surrounds the first area, and includes fou

Assignees

• Sharp Kk

Inventors

• Asaoka Yasushi
• Katsuta Shohei
• Yui Hideomi
• OCHI Sho
• Maeda Tsuyoshi

Classifications

• G02B5/0278 Primary

  used in transmission · CPC title

• G02B5/0236

  the diffusion taking place within the volume of the element · CPC title

• G02F1/133504

  Diffusing, scattering, diffracting elements (associated to illuminating devices G02F1/133606) · CPC title

• G02B5/0268

  characterized by the fabrication or manufacturing method · CPC title

• G02F1/133606

  including a specially adapted diffusing, scattering or light controlling members · CPC title