US Patent No: 7,905,647
Number of patents in Portfolio can not be more than 2000
Prism sheet, back light unit using the same and liquid crystal display device having the back light unit
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Mar 15, 2011
Issued date -
Dec 27, 2005
filing date -
11/320,250
serial no -
In Force
status
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Abstract
A prism sheet, a back light unit using the same and liquid crystal display device having the back light unit are disclosed, for improvement of light concentration, frontal luminance and viewing angle, in which the prism sheet includes a light-condensing film. The light condensing film has a plurality of prism peaks, each having a triangular cross section inclined surface which is inclined from a top surface of the light-condensing film at an angle of about 20° to about 40°.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 6,515,785 Optical devices using reflecting polarizing materials | 39 | 1999 | |
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| RE37377 LCD device including an illumination device having a polarized light separating sheet between a light guide and the display | 13 | 1998 | |
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| 5,841,572 Lens array sheet, surface light source, and transmission type display device | 10 | 1998 | |
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| 6,893,136 Panel light source device and back light module for liquid crystal display device | 5 | 2002 | |
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| 5,980,054 Panel-form illuminating system | 26 | 1997 | |
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| 6,002,829 Luminaire device | 70 | 1997 | |
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| 2006/0182,409 Optical films of differing refractive indices | 2 | 2005 | |
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| 2005/0275,334 Brightness enhancement film for liquid crystal display and manufacturing method thereof | 2 | 2005 | |
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| 5,956,107 Diffusion optical guide plate, and backlight source and liquid crystal display apparatus using the same | 33 | 1997 | |
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| 7,140,743 Direct backlight module | 2 | 2003 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 3.5 Year Payment | $1600.00 | $800.00 | $400.00 | Sep 15, 2014 |
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Sep 15, 2018 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Sep 15, 2022 |
| Fee | Large entity fee | small entity fee | micro entity fee |
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| Surcharge - 3.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
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