JP2012079676A5

JP2012079676A5 -

Info

Publication number: JP2012079676A5
Application number: JP2011029881A
Authority: JP
Filing date: 2011-02-15
Publication date: 2014-04-03

Claims

A light guide member having a light exit surface and at least one light incident portion,
Wherein the at least one light entrance portion have a plurality of recesses or projections,
At least one of the shape, depth or height of the plurality of concave portions or convex portions, and the pitch in the direction parallel to the major axis direction of the light exit surface or the pitch in the direction parallel to the major axis direction of the light incident portion is irregular. Is different from
The openings or bottom surfaces of the plurality of recesses or projections have an anisotropic shape that is long in a specific direction, and the specific direction is perpendicular to the long axis direction of the light exit surface or the light incident portion. Direction perpendicular to the major axis direction of
The average pitch in the direction parallel to the major axis direction of the light exit surface of the plurality of concave portions or convex portions or the average pitch in the direction parallel to the major axis direction of the light incident portion is 20 μm or less,
The average depth or height of the plurality of concave portions or convex portions is 1 to 50 μm,
A moth-eye structure is provided on the surface of the plurality of recesses or protrusions, and the average pitch of the moth-eye structure is 500 nm or less.
Light guide member .

The diffusion angle in the direction parallel to the major axis direction of the light exit surface or the diffusion angle in the direction parallel to the major axis direction of the light incident part when a light beam is incident on the light incident part from the normal direction is 30 °. The light guide member according to claim 1, wherein the light guide member is at least 120 °.

In distribution for the emission angle of the transmitted light intensity when the from the normal direction is incident rays to the light incident part, the transmitted light intensity at the emission angle = 0 ° is at least 90% of the peak intensity claim 1 or 2. The light guide member according to 2 .

The light guide member according to any one of claims 1 to 3 , wherein the plurality of concave portions or convex portions are formed by speckle pattern exposure.

Having a flat plate shape with the light-emitting surface and a facing surface facing the light-emitting surface as main surfaces;
The at least one light incident portion is on a side surface sandwiched between the light exit surface and the facing surface;
Light guide member according to any one of claims 1-4.

The light guide member according to claim 5 ;
A plurality of point light sources disposed in the vicinity of the at least one light incident portion of the light guide member;
A surface light source device.

A display panel having a display area for displaying light by adjusting light transmission;
The surface light source device according to claim 6 disposed on the back surface of the display panel;
A display device.

Wherein the plurality of point light sources are arranged at regular intervals, and the arrangement pitch is denoted by P, a horizontal distance G between the said display area and at least one light entrance portion satisfies the following condition (1), in claim 7 The display device described.
(1) P / G> 1

The light guide member has two light incident portions sandwiched between the light exit surface and the facing surface;
The plurality of point light sources are arranged at equal intervals in the vicinity of each of the two light incident portions,
The arrangement pitch of the point light sources arranged in the vicinity of the first light incident section is P1, the arrangement pitch of the point light sources arranged in the vicinity of the second light incident section is P2, and the first light incident section and the display the horizontal distance between the areas G1, the horizontal distance between the second of the display area and the light entrance portion when the G2, satisfies the following condition (2), according to claim 7 or 8 Display device.
(2) P1 / G1: P2 / G2 = 100: 90 to 100: 110

The display device according to claim 9 , further satisfying the following condition (3):
(3) G1 ≠ G2

Wherein the display panel is a liquid crystal display panel, the display device according to any one of claims 7-10.

A display device according to any one of claims 7 to 10 ,
A tuner for receiving broadcast video signals;
A television receiver.