Sheet type optical device and backlighting unit using the same
First Claim
1. A sheet type optical device, comprising:
- a transparent sheet having first and second surfaces made from a light-transmissive material; and
a plurality of prisms on the first surface of the transparent sheet, the prisms being substantially parallel to each other and having a vertical angle in a range of about 50°
to 70°
,wherein said transparent sheet and said prisms are made from a material having a refractive index in a range of about 1.5 to 1.65,whereby a light beam entering the second surface of the transparent sheet at an oblique incident angle exits the device in a direction substantially perpendicular to the first surface.
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0 Petitions
Accused Products
Abstract
A sheet type optical device that perpendicularly stands light beams progressing obliquely with respect to the plane of the sheet includes a transparent sheet made from a transmissive material and prisms formed in parallel on one surface thereof, the prisms having a vertical angle of about 50° to 70°. The light progressing obliquely with respect to the plane is perpendicularly stood by the prisms. The sheet type optical device is used to form a backlighting unit for a liquid crystal display panel or the like. The backlighting unit includes a light source, a light guide, and the sheet type optical device, and optionally includes a reflective plate, a diffusion panel and a protective film.
130 Citations
54 Claims
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1. A sheet type optical device, comprising:
-
a transparent sheet having first and second surfaces made from a light-transmissive material; and a plurality of prisms on the first surface of the transparent sheet, the prisms being substantially parallel to each other and having a vertical angle in a range of about 50°
to 70°
,wherein said transparent sheet and said prisms are made from a material having a refractive index in a range of about 1.5 to 1.65, whereby a light beam entering the second surface of the transparent sheet at an oblique incident angle exits the device in a direction substantially perpendicular to the first surface. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A sheet type optical device, comprising:
-
a transparent sheet having first and second surfaces made from a light-transmissive material; and a plurality of prisms formed on the first surface of the transparent sheet, the prisms being substantially parallel to each other and having a vertical angle in a range of about 50°
to 70°
,wherein said transparent sheet and said prisms are made from a material having a refractive index in a range of about 1.5 to 1.65, whereby a light beam entering the second surface of the transparent sheet at an incident angle in a range of about 15°
to 50°
exits the device in a direction substantially perpendicular to the first surface. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A backlighting unit, comprising:
-
a light source for generating light; a light guide having a light receiving surface disposed adjacent the light source for receiving the light from the light source and a light emitting surface extending from the light receiving surface, the light guide uniformly distributing the light from the light source on the light emitting surface, the light exiting the light emitting surface obliquely; and a prism panel having a plurality of prisms on a first surface with a vertical angle in a range of about 50°
to 70°
, wherein said prisms are made from a material having a refractive index in a range of about 1.5 to 1.65, the prism panel being disposed to receive light from the light emitting surface of the light guide, whereby the received light exits the panel in a direction substantially perpendicular to the first surface. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A backlighting unit, comprising:
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a light source for generating light; a light guide having a light receiving surface disposed adjacent the light source for receiving the light from the light source and a light emitting surface extending from the light receiving surface, the light guide uniformly distributing the light from the light source on the light emitting surface, the light exiting the light emitting surface obliquely at an angle of about 15°
to 50°
with respect to a direction normal to the light emitting surface; anda prism panel having a plurality of prisms on a first surface, each prism having a vertical angle of about 50°
to 70°
, wherein said prisms are made from a material having a refractive index in a range of about 1.5 to 1.65, the prism panel being disposed to receive light at a second surface thereof from the light emitting surface of the light guide, whereby a light beam received at the second surface at an incident angle of about 15°
to 50°
exits the panel in a direction substantially perpendicular to the first surface. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A sheet type optical device, comprising:
-
a transparent sheet having a first surface; and a plurality of prisms formed on the first surface of the transparent sheet, the prisms being parallel to each other and each having a vertical angle of about 50°
to 70°
, a height of about 5 to 50 μ
m and a width of about 10 to 100 μ
m,wherein the transparent sheet and the prisms are made from a light-transmissive material having a refractive index of about 1.5 to 1.65.
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44. A backlighting unit, comprising:
-
a light source for generating light; a light guide having a light receiving surface for receiving the light from the light source and a light emitting surface extending from the light receiving surface, the light guide uniformly distributing the light from the light source on the light emitting surface; and a prism panel comprising a transparent sheet having first and second opposing surfaces and a plurality of prisms formed on the first surface, the prisms being parallel to each other and each having a vertical angle of about 50°
to 70°
, a height of about 5 to 50 μ
m and a width of about 10 to 100 μ
m, the transparent sheet and the prisms being made from a light-transmissive material having a refractive index of about 1.5 to 1.65, wherein the second surface of the transparent sheet is disposed to receive light from the light emitting surface of the light guide. - View Dependent Claims (45)
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46. A method of forming a sheet type optical device, comprising:
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providing a transparent sheet having first and second surfaces made from a light-transmissive material; and forming a plurality of prisms on the first surface of the transparent sheet, wherein said prisms are made from a material having a refractive index in a range of about 1.5 to 1.65, the prisms being substantially parallel to each other and having a vertical angle in a range of about 50°
to 70°
,whereby a light beam entering the second surface of the transparent sheet at an oblique incident angle exits the device in a direction substantially perpendicular to the first surface.
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47. A method of forming a sheet type optical device, comprising:
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providing a transparent sheet having first and second surfaces made from a light-transmissive material; and forming a plurality of prisms on the first surface of the transparent sheet, wherein said prisms are made from a material having a refractive index in a range of about 1.5 to 1.65, the prisms being substantially parallel to each other and having a vertical angle in a range of about 50°
to 70°
,whereby a light beam entering the second surface of the transparent sheet at an incident angle in a range of about 15°
to 50°
exits the device in a direction substantially perpendicular to the first surface.
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48. A method of assembling a backlight unit, comprising:
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providing a light source for generating light; providing a light guide having a light receiving surface disposed adjacent the light source for receiving the light from the light source and a light emitting surface extending from the light receiving surface, the light guide uniformly distributing the light from the light source on the light emitting surface, the light exiting the light emitting surface obliquely; and providing a prism panel having a plurality of prisms on a first surface with a vertical angle in a range of about 50°
to 70°
, wherein said prisms are made from a material having a refractive index in a range of about 1.5 to 1.65, the prism panel being disposed to receive light from the light emitting surface of the light guide, whereby the received light exits the panel in a direction substantially perpendicular to the first surface. - View Dependent Claims (49)
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50. A method of assembling a backlight unit, comprising:
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providing a light source for generating light; providing a light guide having a light receiving surface disposed adjacent the light source for receiving the light from the light source and a light emitting surface extending from the light receiving surface, the light guide uniformly distributing the light from the light source on the light emitting surface, the light exiting the light emitting surface obliquely at an angle of about 15°
to 50°
with respect to a direction normal to the light emitting surface; andproviding a prism panel having a plurality of prisms on a first surface with a vertical angle in a range of about 50°
to 70°
, wherein said prisms are made from a material having a refractive index in a range of about 1.5 to 1.65, the prism panel being disposed to receive light at a second surface thereof from the light emitting surface of the light guide, whereby a light beam received at the second surface at an incident angle of about 15°
to 50°
exits the panel in a direction substantially perpendicular to the first surface. - View Dependent Claims (51)
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52. A method of fabricating a sheet-type optical device, comprising:
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providing a transparent sheet made from a light-transmissive material having a refractive index of about 1.5 to 1.65; and forming a plurality of prisms on a first surface of the transparent sheet, the prisms being parallel to each other and each having a vertical angle of about 50°
to 70°
, a height of about 5 to 50 μ
m and a width of about 10 to 100 μ
m.
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53. A method of assembling backlighting unit, comprising:
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providing a light source for generating light; providing a light guide having a light receiving surface disposed adjacent the light source for receiving the light from the light source and a light emitting surface extending from the light receiving surface, the light guide uniformly distributing the light from the light source on the light emitting surface; and providing a prism panel comprising a transparent sheet having first and second opposing surfaces and a plurality of prisms formed on the first surface, the prisms being parallel to each other and each having a vertical angle of about 50°
to 70°
, a height of about 5 to 50 μ
and a width of about 10 to 100 μ
m, the transparent sheet and the prisms being made from a light-transmissive material having a refractive index of about 1.5 to 1.65, wherein the second surface of the transparent sheet is disposed to receive light from the light emitting surface of the light guide. - View Dependent Claims (54)
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Specification