Image source unit and image display unit

Patent metadata

Field	Value
Publication number	US-2016103262-A1
Application number	US-201514972710-A
Country	US
Kind code	A1
Filing date	Dec 17, 2015
Priority date	Oct 27, 2009
Publication date	Apr 14, 2016
Grant date	—

Abstract

Provided is an image source unit for improving use efficiency of the image light, including: a light source; and an optical sheet, the optical sheet including: a base material layer; an optical functional layer; and an adhesive layer, the optical functional layer including: light-transmissive portions arranged in parallel; and light-absorbing portions arranged between the light-transmissive portions, whose refractive index is set smaller than that of the light-transmissive portions, the light source side face of the light-transmissive portions includes unit light input control elements so that the elements project towards the light source side, the light-absorbing portions not being arranged between the unit light input control elements, the light source side face of the light-absorbing portions having a recess so that the bottom of the recess faces the opposite side from the light source, the adhesive layer is laminated on a light source side face of the optical functional layer.

First claim

1 . An image source unit comprising: a light source; and an optical sheet laminated on the light source,
wherein
the optical sheet includes: a base material layer; an optical functional layer formed on the light source side surface of the base material layer; and an adhesive layer,
the optical functional layer includes: 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 elastic modulus of 800 MPa or more and 2000 MPa or less; and light-absorbing portions arranged between the light-transmissive portions, whose refractive index is set smaller than that of the light-transmissive portions,
the light source side face of the light-transmissive portions includes unit light input control elements so that the unit light input control elements project towards the light source side in cross section in the sheet-thickness direction, the light-absorbing portions not being arranged between the unit light input control elements,
the light source side face of the light-absorbing portions has a recess portion so that the bottom of the recess portion faces the opposite side from the light source and formed in curved or polygonal manner in cross section in the sheet-thickness direction, wherein 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 the light source side face of the optical functional layer and has a refractive index lower than that of the light-transimissive 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 light absorbing portion is 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 at a rate of 3 mass % or more and less than 10 mass %.

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

4 . 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.

5 . The image source unit according to claim 1 , wherein the unit light input element and a reflection type polarizing plate are bonded to each other by an adhesive.

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

Assignees

• Dainippon Printing Co Ltd

Inventors

• Kashiwagi Tsuyoshi
• Naito Nobuo

Classifications

• G02B6/0056

  for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements · CPC title

• G02B3/005

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

• G02B6/0046

  Tapered light guide, e.g. wedge-shaped light guide · CPC title

• G02B5/223

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

• G02B6/005 Primary

  provided by one optical element, or plurality thereof, placed on the light output side of the light guide · CPC title