IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0241989
(1999-02-02)
|
등록번호 |
US-RE41566
(2010-09-13)
|
우선권정보 |
JP-4-246225(1992-09-16) |
발명자
/ 주소 |
- Suzuki, Masaru
- Hanzawa, Fumihisa
|
출원인 / 주소 |
|
대리인 / 주소 |
Thomas, Kayden, Horstemeyer & Risley
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
16 |
초록
▼
The liminance within the viewing angle of an LCD device is increased by using an optical film of transparent material. The film has a first surface having a wave structure including a plurality of isosceles triangle prisms arranged side-by-side, and a second surface having an optically rough structu
The liminance within the viewing angle of an LCD device is increased by using an optical film of transparent material. The film has a first surface having a wave structure including a plurality of isosceles triangle prisms arranged side-by-side, and a second surface having an optically rough structure for performing diffuse transmission. The film may also have a first surface having a structure including a plurality of quadrangular prisms arranged side-by-side, and a second surface having an optically rough structure for performing diffuse transmission.
대표청구항
▼
What is claimed is: 1. A liquid crystal display device including a liquid crystal display panel and a back light device, said back light device comprising: a light source for emitting light; a light guide means having a top surface facing a back surface of said liquid crystal display panel and a
What is claimed is: 1. A liquid crystal display device including a liquid crystal display panel and a back light device, said back light device comprising: a light source for emitting light; a light guide means having a top surface facing a back surface of said liquid crystal display panel and a side surface receiving said light from said light source; a reflector means provided on a back surface of said light guide means; and an optical film of transparent material positioned between said back surface of said liquid crystal display panel and said top surface of said light guide means, including a first surface having a wave structure including a plurality of regularly spaced isosceles triangles prisms arranged side-by-side, the prisms having smooth surfaces, and a second surface having an optically rough structure for performing diffuse transmissions, wherein a top angle of said isosceles triangle prisms is in a range of 95 degrees to 120 degrees for flat, angles prism surfaces to gather light from the diffuse transmission into a desired viewing angle for the liquid crystal display panel, wherein a polarizer is positioned between said liquid crystal display panel and said optical film, and a direction along which said peaks and valleys of said isosceles triangle prisms are oriented is aligned in parallel to a polarizing axis of said polarizer and the tops of the isosceles triangle prisms are not farther than 160 μm apart. 2. A liquid crystal display device according to claim 1, wherein a polarizer is positioned between said liquid crystal display panel and said optical film, and a direction along which said peaks and valleys of said isosceles triangle prisms are oriented is aligned in parallel to a polarization axis of said polarizer and the tops of the isosceles triangle prisms are not farther than 160 μm apart. 3. A liquid crystal display device including a liquid crystal display panel and a back light device, said back light device comprising: a light source for emitting light; a light guide means having a top surface facing a back surface of said liquid crystal display panel and a side surface receiving said light from said light source; a reflector means provided on a back surface of said light guide means; and two optical films of transparent material positioned between said back surface of said liquid crystal display and said top surface of said light guide means, each of said optical films including a first surface having a wave structure including a plurality of isosceles triangle prisms arranged side-by-side, the prism having smooth surfaces, and a second surface having an optically rough structure for performing diffuse transmission wherein a top angle of said isosceles triangle prisms is in a range of 95 degrees to 120 degrees for flat, angled angles prism surfaces to gather light from the diffuse transmission by the second surface into a desired viewing angle for the liquid crystal display panel. 4. A liquid crystal display device according to claim 3, wherein a direction along which peaks and valleys of said isosceles triangle prisms of one of said two optical films is oriented is at an angle with respect to a direction along which peaks and valleys of said isosceles triangles prisms of another of said two optical films are oriented. 5. A liquid crystal display device according to claim 3, wherein a polarizer is positioned between said liquid crystal display panel and said two optical films, and a direction along which peaks and valleys of said isosceles triangle prisms of said optical film closer to said polarizer is oriented in parallel to a polarizing axis of said polarizer and the tops of the isosceles triangle prisms are no more than 160 μm apart. 6. A liquid crystal display device including a liquid crystal display panel and a back light device, said back light device comprising: a light source for emitting light; a light guide means having a top surface facing a back surface of said light crystal display panel and a side surface receiving said light from said light source; a reflector means provided on a back surface of said light guide means; and an optical film of transparent material positioned between said liquid crystal display panel and said light guide means, including a first surface having a structure including a plurality of quadrangular prisms, which are substantially the same size and shape, in an orderly matrix of equally spaced prisms, the prisms having smooth surfaces, and a second surface having an optically rough structure for performing diffuse transmission wherein a top angle of said quadrangular prisms is in a range of 95 degrees to 120 degrees for flat, angles sides of the prisms to gather the light from the diffuse transmission of the second surface into the desired viewing angle for the liquid crystal display device, wherein a polarizer is positioned between said liquid crystal display panel and said optical film, and a direction along which said peaks and valleys of said quadrangular prisms are oriented is aligned in parallel to a polarizing axis of said polarizer. 7. A liquid crystal display device according to claim 6, wherein a polarizer is positioned between said liquid crystal display panel and said optical film, and a direction along which peaks and valleys of said quadrangular prisms of said optical film are oriented in parallel to a polarizing axis of said polarizer and the tops of the quadrangle prisms are no more than 160 μm apart. 8. A liquid crystal display device including a liquid crystal display panel and a back light device, said back light device comprising: a light source for emitting light; a light guide having a top surface facing a back surface of said display panel and a side surface receiving said light from said light source; a reflector provided on a back surface of said light guide; and an optical film of light transparent material positioned between said back surface of said liquid crystal display panel and said top surface of said light guide, said optical film including a first surface having an optically rough structure for diffuse-transmitting said light from said light guide and a second surface having a wave structure including a plurality of isosceles triangle prisms arranged side-by-side, the prisms having smooth surfaces for refracting said light diffuse-transmitted from said first surface to gather light passing through said second surface in a direction toward said display panel, wherein a top angle of said isosceles triangle prisms of said optical film is in a range of about 90 degrees to about 120 degrees for flat, angles prism surfaces to gather light from the diffuse transmission and directionally distribute said light within a range defined by a given angle, wherein a polarizer is positioned between said liquid crystal display panel and said optical film, and a direction along which said peaks and valleys of said isosceles triangle prisms are oriented is aligned in parallel to a polarizing axis of said polarizer and the tops of the isosceles triangle prisms are not farther than 160 μm apart. 9. The liquid crystal display device according to claim 8, wherein luminance of said gathered light is increased within and decreased outside of a desired viewing angle of about 35 degrees in the vertical direction and about 55 degrees in the horizontal direction of said display panel. 10. The liquid crystal display device according to claim 8, further including a second optical film positioned between said back surface of said liquid crystal display panel and said top surface of said light guide, wherein a direction along which peaks and valleys of said isosceles triangle prisms of one of said two optical films are oriented is at an angle with respect to a direction along which peaks and valleys of said isosceles triangles prisms of another of said two optical films are oriented. 11. The liquid crystal display device according to claim 10, wherein said angle is perpendicular. 12. The liquid crystal display device according to claim 10, wherein a polarizer is positioned between said liquid crystal display panel and said two optical films, and a direction along which peaks and valleys of said isosceles triangle prisms of said optical film closer to said polarizer is oriented in parallel to a polarizing axis of said polarizer. 13. An optical film of light transparent material including a first surface having an optically rough structure for diffuse-transmitting incident light and a second surface having a wave structure including a plurality of isosceles triangle prisms arranged side-by-side, the prisms having smooth surfaces for refracting said light diffuse-transmitted from said first surface and directionally distributing said diffuse-transmitted light through said second surface for increasing illumination within a viewing angle of about 35 degrees in the vertical direction and about 55 degrees in the horizontal direction wherein a top angle of said isosceles triangle prisms is a range of about 90 degrees to about 120 degrees, wherein a polarizer is positioned between a liquid crystal display panel and said optical film, and a direction along which at least a portion of peaks and valleys of said isosceles triangle prisms are oriented is aligned in parallel to a polarizing axis of said polarizer and the tops of the isosceles triangle prisms are not farther than 160 μm apart. 14. The optical film according to claim 13, wherein a polarizer is positioned between a liquid crystal display panel and said optical film, wherein a direction along which peaks and valleys of said isosceles triangle prisms are oriented is aligned in parallel to a polarizing axis of said polarizer. 15. An optical film of light transparent material including a first surface having an optically rough structure for diffuse-transmitting incident light and a second surface having a wave structure including a plurality of isosceles triangle prisms arranged side-by-side, the prisms having smooth surfaces for refracting said light diffuse-transmitted from said first surface and directionally distributing said diffuse-transmitted light through said second surface wherein a top angle of said isosceles triangle prisms is in a range of about 90 degrees to about 120 degrees, wherein the tops of the isosceles triangle prisms are no more than 160 μm apart, and wherein a polarizer is positioned between a liquid crystal display panel and said optical film, and a direction along which at least a portion of peaks and valleys of said isosceles triangle prisms are oriented is aligned in parallel to a polarizing axis of said polarizer. 16. An optical film for use in a liquid crystal display having a front portion and a back portion, said optical film comprising: diffusing means including an optically rough structure on a first surface of said film for diffuse-transmitting light illuminated proximal to said back portion of said display; and refracting means on a second surface of said film including a plurality of isosceles triangle prisms arranged side-by-side for directionally distributing said diffuse-transmitted light toward said front portion of said display and for increasing luminance of light within a viewing angle of about 35 degrees in the vertical direction and about 55 degrees in the horizontal direction of said front portion of said display, wherein a top angle of said isosceles triangle prisms is in a range of about 90 degrees to about 120 degrees, wherein a polarizer is positioned between said liquid crystal display panel and said optical film, and a direction along which at least a portion of peaks and valleys of said isosceles triangle prisms are oriented is aligned in parallel to a polarizing axis of said polarizer and the tops of the isosceles triangle prisms are not farther than 160 μm apart. 17. The optical film according to claim 16, wherein a polarizer is positioned between said front portion of said liquid crystal display and said optical film, wherein a direction along which peaks and valleys of said isosceles triangle prisms are oriented is aligned in parallel to a polarizing axis of said polarizer. 18. A film for use in an optical system comprising a light source and a polarizer having a polarization axis, the film comprising a transparent material including a first surface and a second surface, said first surface having a structure including a plurality of isosceles triangular prisms arranged side-by-side for increasing luminance of light passing through said film in a direction corresponding to said polarization axis of said polarizer, and said second surface having an optically rough structure for diffuse transmitting light emitted by said light source, wherein a top angle of said isosceles triangle prisms is in a range of about 90 degrees to about 120 degrees, wherein the tops of the isosceles triangle prisms are no more than 160 μm apart, and wherein said polarizer is positioned between a liquid crystal display panel and said film, and a direction along which at least a portion of peaks and valleys of said isosceles triangle prisms are oriented is aligned in parallel to a polarizing axis of said polarizer. 19. The optical film according to claim 18, wherein said optical film is positioned within a liquid crystal display, said prisms having smooth surfaces for gathering diffuse transmitted light for increasing illumination within and decreasing illumination outside of a viewing angle of about 35 degrees in the vertical direction and about 55 degrees in the horizontal direction of the liquid crystal display.
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