JP2009080193A5 - - Google Patents

Claims (14)

A display device formed so that an image can be emitted to an observer side,
An image source and an optical sheet laminated directly or via another layer on the image output side of the image source,
The optical sheet has a plurality of layers for controlling the light emitted from the video source and emitting the light to the viewer side,
At least one of the plurality of layers is a base material layer,
One layer arranged on the viewer side surface of the base material layer includes a prism portion arranged in parallel along the sheet surface so as to transmit light, and a light absorbing portion arranged in parallel so as to absorb light between the prism portions. An optical functional sheet layer having
One layer arranged on the surface of the base material layer on the image source side is an adhesive layer. In the sheet thickness direction cross section of the optical sheet,
The prism portion of the optical function sheet layer is a trapezoid having a long lower base on the image source side and a short upper base on the observer side,
The display device according to claim 1, wherein the light absorbing portion is a triangle having a base on the viewer side. In the sheet thickness direction cross section of the optical sheet,
The prism portion of the optical function sheet layer is a trapezoid having a long lower base on the image source side and a short upper base on the observer side,
The display device according to claim 1, wherein the light absorption unit is a trapezoid having a short upper base on the image source side and a long lower base on the viewer side.   The said other layer arrange | positioned between the said image source and the said optical sheet is a layer which interrupts | blocks electromagnetic waves, and / or a layer which correct | amends a color tone, The any one of Claims 1-3 characterized by the above-mentioned. The display device according to item.   The display device according to any one of claims 1 to 4, further comprising at least one of an antireflection film, an antistatic film, and an antiglare film.   The light absorbing portion of the optical sheet has a light absorbing performance such that the transmittance is 40 to 70% in the transmittance measurement of a sheet having a thickness of 6 μm formed only of the material constituting the light absorbing portion. The display device according to claim 1, wherein the display device is configured as described above.   The trapezoid hypotenuse provided between the upper base and the lower base of the prism portion of the optical sheet is greater than 0 degree and less than or equal to 10 degrees with respect to the normal of the sheet surface. Item 7. The display device according to any one of Items 2 to 6.   8. The trapezoid hypotenuse provided between the upper base and the lower base of the prism portion of the optical sheet is formed in a polygonal line shape or a curved line. The display device described.   The display device according to claim 1, wherein the light absorbing portion of the optical sheet contains light absorbing particles having an average particle diameter of 1 μm or more.   When the material forming the prism portion of the optical sheet has a refractive index Np and the material forming the light absorbing portion has a refractive index Nb, there is a relationship of Np ≧ Nb between the Np and Nb, and the Np Nb is a value of 1.49-1.56, The display apparatus as described in any one of Claims 1-9 characterized by the above-mentioned. The prism portion and the light absorbing portion of the optical functional sheet layer of the optical sheet are formed to have a predetermined cross section and extend in the longitudinal direction, and the optical functional sheet layer is laminated in two layers, The display device according to any one of claims 1 to 10, wherein the two optical function sheet layers are laminated so that the longitudinal direction of the light absorption portion is orthogonal to one and the other.   The display device according to claim 1, wherein the image source is a plasma display panel.   An image source unit, comprising the image source and the optical sheet, integrally formed and used in the display device according to claim 1. A method for manufacturing the display device according to claim 1,
Applying an adhesive to the substrate;
Forming the optical function sheet layer on the base material coated with the adhesive;
Attaching the surface coated with the adhesive directly to the image source or via another layer.