Prism sheet, back light unit and liquid crystal display device having the same
OwnerHyeok-Joon Yoon, Ju Ilun Min +1inventors
InventorsHyeok-Joon Yoon, Ju Ilun Min, Sung-Hun Kim
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Abstract
A prism sheet prevents the occurrence of a moiré pattern and a wet-out phenomenon by increasing irregularity of prisms formed thereon, by configuring the prisms adjacent to each other to have different heights, and by differently forming widths of triangular sectional surfaces of one prism according to positions. As the height difference of the prisms adjacent to each other is set as 1.2-1.5 μm, a pressure applied to the prism sheet is distributed to the prisms. This may prevent deformation of the prisms.
Claims10
A prism sheet, comprising:
- a base film;
- and
- a plurality of prisms formed on the base film, the prism being extended from one side to another side of the base film and having triangle shaped cross section,
- wherein the prisms adjacent to each other have different heights, and a height difference between the adjacent prisms is approximately 1.2-1.5 μm.
A backlight unit, comprising:
- at least one lamp for emitting light;
- a light guide panel for guiding the light emitted from the lamp;
- at least one diffusion sheet above the light guide panel to diffuse the light incident from the light guide panel;
- a first prism sheet having a plurality of prisms formed thereon to concentrate the incident light, the prisms having triangle shaped cross section and height differences between the adjacent prisms is approximately 1.2-1.5 μm;
- and
- a second prism sheet above the first prism sheet, the second prism having a plurality of prisms of triangle shaped cross section.
A liquid crystal display (LCD) device, comprising:
- an LCD panel for displaying an image;
- at least one lamp for emitting light;
- a light guide panel for guiding the light emitted from the lamp to the LCD panel;
- at least one diffusion sheet above the light guide panel to diffuse the light incident from the light guide panel;
- a first prism sheet having a plurality of prisms formed thereon to concentrate the incident light and supplying the concentrated light to the LCD panel, the prisms having triangle shaped cross section and height differences between the adjacent prisms is approximately 1.2-1.5 μm;
- and
- a second prism sheet above the first prism sheet, the second prism having a plurality of prisms of triangle shaped cross section.
Dependencies are inferred from the claim text.