Image source unit and image display unit

Patent metadata

Field	Value
Publication number	US-9244204-B2
Application number	US-91129110-A
Country	US
Kind code	B2
Filing date	Oct 25, 2010
Priority date	Oct 27, 2009
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

The present invention is to provide an image source unit for improving use efficiency of the image light and also provide an image display unit comprising the image source unit.
The image source unit 4 comprising: an image light source 5 ; and an optical sheet 10 laminated on the image light source, the optical sheet comprising: a base material layer 11 ; and an optical functional layer 12 formed on the image light source side surface of the base material layer, the optical functional layer comprising: light-transmissive portions 13 arranged parallel along the sheet face; and light-absorbing portion(s) 14 arranged between the light-transmissive portions, the image light source side face of the light-transmissive portion having protrusions 17 each having a curved or polygonal line so that the protrusions project towards the image light source side in cross section in the sheet-thickness direction.

First claim

What is claimed is:

1. An image source unit comprising: an image light source; and an optical sheet laminated on the image light source,
the optical sheet comprising: a base material layer; an optical functional layer formed on the image light source side surface of the base material layer; and an adhesive layer,
the optical functional layer comprising:

light-transmissive portions extending in one direction and arranged parallel in a direction different from said one direction in a light transmissive manner along the sheet face, having elestic modulus of 800 MPa or more and 2000 MPa or less; and light-absorbing portions arranged in a light absorbing manner by being filled with a material which includes light-absorbing particles having an average diameter of 1.0 μm or more and 20 μm or less dispersed in a binder between the light-transmissive portions, at a rate of 3 mass% or more and less than 10 mass%, a refractive index of the binder being set smaller than that of the light-transmissive portions,
the image light source side face of the light-transmissive portions having convex lenses in cross section in the sheet-thickness direction so that the convex lenses project towards the image light source side in cross section in the sheet-thickness direction, the light-absorbing portions not being arranged between the convex lenses,
the image light source side face of the light-absorbing portions having a recess portion so that the bottom of the recess portion faces the opposite side from the image light source and formed in curved or polygonal manner in cross section in the sheet-thickness direction,
wherein the depth of the recess portion of the light-absorbing portion is in the range of 0.5-6 μm,
the adhesive layer is layered on an image light source side face of the optical functional layer and has a refractive index lower than that of the light-transmissive portions, and
the storage elastic modulus of an adhesive for forming the adhesive layer is 0.22 MPa or more and 0.8 MPa or less.

2. The image source unit according to claim 1 , wherein the optical sheet has an antireflection layer or an anti-glare layer located on its surface opposite to the light source.

3. The image source unit according to claim 1 further comprising a wavelength filter layer for controlling transmissivity of a light having a certain wavelength.

4. An image display unit comprising the image source unit according to claim 1 .

5. The image source unit according to claim 1 , wherein the image light source side of the light-absorbing portions is covered with a covering layer.

6. The image source unit according to claim 1 , wherein the thickness of the adhesive layer is 20 μm or more and 50 μm or less.

7. The image source unit according to claim 1 further comprising an electromagnetic wave shielding layer for shielding electromagnetic waves.

Assignees

• Kashiwagi Tsuyoshi
• Naito Nobuo
• Dainippon Printing Co Ltd

Inventors

• Kashiwagi Tsuyoshi
• Naito Nobuo

Classifications

• G02B3/005

  arranged along a single direction only, e.g. lenticular sheets (G02B3/0043 takes precedence) · CPC title

• G02B5/208

  for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation · CPC title

• G02B5/003 Primary

  Light absorbing elements · CPC title

• G02B5/223

  containing organic substances, e.g. dyes, inks or pigments · CPC title