Light diffusion film, plane light source device and liquid...

Details Light diffusion film, plane light source device and liquid... Light diffusion film, plane light source device and liquid...

2005-07-12

2005-07-12

Chowdhury, Tarifur R. (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Particular illumination

C349S112000, C359S599000, C428S001100

Reexamination Certificate

active

06917396

ABSTRACT:
A transmissive display apparatus comprises a liquid crystal display unit; and a plane light source unit that comprises a tubular light source, a light guide, and a light-diffusing film having anisotropy that provides a consistent luminance in a display surface, and/or ultraviolet (UV) absorbability that absorbs the UV from the light source and prevents deterioration of a prism sheet in the display unit and liquid display cell. In the film, a light-scattering characteristic F(θ) represents a relationship between the light-scattering angle θ and a scattered light intensity F fulfills Fy(θ)/Fx(θ)≧1.01 over a range of θ=4 to 30°, wherein Fx(θ) and Fy(θ) represent the light-scattering characteristics in an X-axial direction and Y-axial direction of the film, respectively. The film comprises a light-diffusing layer composed of a plurality of resins which are different from each other in refractive index, and a transparent layer laminated on at least one side thereof.

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