Compensation films for liquid crystal displays
The present invention relates to optical compensation films applied to a twisted nematic liquid crystal display. This compensation film improves viewing angle, especially in the vertical direction. It also has a low average tilt angle, and large retardation value and thickness, therefore allows an e...
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| Main Authors | , , |
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| Format | Patent |
| Language | English |
| Published |
16.11.2004
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| Online Access | Get full text |
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| Summary: | The present invention relates to optical compensation films applied to a twisted nematic liquid crystal display. This compensation film improves viewing angle, especially in the vertical direction. It also has a low average tilt angle, and large retardation value and thickness, therefore allows an easy manufacturing.
Disclosed is an optical compensation film for improves viewing angle of twisted nematic liquid crystal display, especially in the vertical viewing direction. The said optical compensation film contains a positively birefringent material oriented with its optic axis tilted in a plane perpendicular to the film plane, wherein the phase retardation value defined by (ne-no)d is 100±20 nm at the wavelength of 550 nm and the average tilt angle relative to the film plane is 10±5°, where ne and no are the extraordinary and ordinary refractive indices, respectively, and d, the thickness of the birefringent material. |
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