US20100150509A1 - Brightness enhancement film and backlight module - Google Patents
Brightness enhancement film and backlight module Download PDFInfo
- Publication number
- US20100150509A1 US20100150509A1 US12/314,533 US31453308A US2010150509A1 US 20100150509 A1 US20100150509 A1 US 20100150509A1 US 31453308 A US31453308 A US 31453308A US 2010150509 A1 US2010150509 A1 US 2010150509A1
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- US
- United States
- Prior art keywords
- micro
- reflectors
- average
- brightness enhancement
- enhancement film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000000694 effects Effects 0.000 abstract description 5
- 239000010408 film Substances 0.000 description 29
- 238000009792 diffusion process Methods 0.000 description 5
- 230000002708 enhancing effect Effects 0.000 description 3
- 239000012788 optical film Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S385/00—Optical waveguides
- Y10S385/901—Illuminating or display apparatus
Abstract
Description
- 1. Field of the Invention
- The present invention relates to a brightness enhancement film and a backlight module having the brightness enhancement film, and more particularly to a brightness enhancement film having first and second micro-reflectors in different average heights and widths and wavy crest lines. The widths of the first and second micro-reflectors vary along with valleys and peaks thereof. The neighboring lines between the first and second micro-reflectors are wavy. This enhances brightness, illuminates evenly, and avoids a moire effect.
- 2. Description of the Prior Art
- A backlight module A of a conventional LCD display, as shown in
FIG. 9 , comprises a light guide plate A1, a light source A2, a reflector A3, a diffusion film A4, and a brightness enhancement film A5. The light source A2 is disposed at one side of the light guide plate A1 to provide light from a ray entering side A6 to the light guide plate A1 to reflect therein and emit from a ray displaying side A7. The light will then emits through the diffusion film A4 and the brightness enhancement film A5 and reaches to a LCD panel B. The brightness enhancement film A5 can accumulate the light to increase the light as well as to illuminate evenly. - In order to accumulate illumination for a brightness enhancement film to increase the brightness and to illuminate evenly, the surface of the film comprises a number of prisms. As taught in U.S. Pat. No. 5,917,664, a brightness enhancement film has a plurality of linear prisms. The prisms are disposed in pairs, each pair having first and second prisms and each prism has a prism angle and a valley angle. Either the prism angles or the valley angles, but not both, are equal. However, it does not have the function of accumulating light.
- Taiwanese Patent No. I274896 disclosed “an enhancing structure for a light accumulating device”, which comprises a light accumulating device on a baseboard. The light accumulating device has at least a wavy extension surface to enhance light accumulating efficiency. However, this design can not diffuse the light evenly on the display.
- Taiwanese Patent No. I278662 disclosed “an optical film structure”, which comprises micro-prisms formed on an optical film. Each micro-prism has at least two peaks in different heights, preventing the ray from producing interference strips. However, it downgrades the accumulation of light.
- According to a first aspect of the present invention, there is provided a brightness enhancement film comprising a pair of first sides corresponding to each other, a pair of second sides corresponding to each other, and a number of first micro-reflectors and second micro-reflectors disposed side by side, said first micro-reflectors having a first average height and a first average width, said second micro-reflectors having a second average height and a second average width, said first average height and said first average width being different from said second average height and said second average width, each of said first micro-reflectors and said second micro-reflectors having a cross-section which is a triangle viewed from the first side, said triangle having an apex and a base, said apex of said triangle forming a crest line viewed from the second side, two sides of said crest line being connecting points of said triangle, said connecting points forming neighboring lines of said first micro-reflector and said second micro-reflector, said crest line being wavy having continuous valleys and peaks, the widths of said first micro-reflectors and said second micro-reflectors varying along with said valleys and said peaks, said neighboring lines between said first micro-reflectors and said second micro-reflectors being wavy.
- Preferably, the valley of each said first micro-reflector has an equal height with respect to the peak of each said second micro-reflector.
- Preferably, the valley of each said first micro-reflector has a different height with respect to the peak of each said second micro-reflector.
- Preferably, each of said first micro-reflectors and said second micro-reflectors has a triangular cross-section having two same base angles.
- Preferably, each of said first micro-reflectors and said second micro-reflectors has a triangular cross-section having two different base angles.
- Preferably, said first and second average heights of said first micro-reflectors and said second micro-reflectors are average values of the perpendicular heights of said first micro-reflectors and said second micro-reflectors.
- Preferably, said first and second average widths of said first micro-reflectors and said second micro-reflectors are average values of the width taken from a bottom of the cross-section of each of said first micro-reflectors and said second micro-reflectors.
- According to a second aspect of the present invention, there is provided a backlight module, comprising at least a light source; a light guide plate having at least one ray entering side and a ray displaying side, said ray entering side being adapted to receive ray from said light source and said ray displaying side being adapted to guide the ray outward; and a brightness enhancement film disposed on said ray displaying side of said light guide plate, said brightness enhancement film comprising a pair of first sides corresponding to each other, a pair of second sides corresponding to each other, and a number of first micro-reflectors and second micro-reflectors disposed side by side, said first micro-reflectors having a first average height and a first average width, said second micro-reflectors having a second average height and a second average width, said first average height and said first average width being different from said second average height and said second average width, each of said first micro-reflectors and said second micro-reflectors having a cross-section which is a triangle viewed from the first side, said triangle having an apex and a base, said apex of said triangle forming a crest line viewed from the second side, two sides of said crest line forming connecting points of said triangle, said connecting points being neighboring lines of said first micro-reflectors and said second micro-reflectors, said crest line being wavy having continuous valleys and peaks, the widths of said first micro-reflectors and said second micro-reflectors varying along with said valleys and said peaks, said neighboring lines between said first micro-reflectors and said second micro-reflectors being wavy.
- Preferably, the valley of each said first micro-reflector has an equal height with respect to the peak of each said second micro-reflector
- Preferably, the valley of each said first micro-reflector has a different height with respect to the peak of each said second micro-reflector.
- Preferably, each of said first micro-reflectors and said second micro-reflectors has a triangular cross-section having two same base angles.
- Preferably, each of said first micro-reflectors and said second micro-reflectors has a triangular cross-section having two different base angles.
- Preferably, said first and second average heights of said first micro-reflectors and said second micro-reflectors are average values of the perpendicular heights of said first micro-reflectors and said second micro-reflectors.
- Preferably, said first and second average widths of said first micro-reflectors and said second micro-reflectors are average values of the width taken from a bottom of the cross-section of each of said first micro-reflectors and said second micro-reflectors.
- The present invention has the following advantages:
- 1. The first and second micro-reflectors having different heights and widths are disposed side by side on the brightness enhancement film in a wavy shape, providing better brightness and illuminating evenly.
- 2. The first and second micro-reflectors have peaks and valleys to hold against the diffusion film, preventing the brightness enhancement film from distortion or damage.
- 3. The valleys of the first and second micro-reflectors enable to collect light ray for better brightness, avoiding a moire effect.
-
FIG. 1 is a perspective view of a brightness enhancement film of the present invention; -
FIG. 2 is an enlarged sectional view ofFIG. 1 ; -
FIG. 3 is a cross-sectional view ofFIG. 1 showing first micro-reflectors and second micro-reflectors; -
FIG. 4 is a schematic view showing the variation of the heights of the first micro-reflectors and the second micro-reflectors; -
FIG. 5 is a schematic view showing the variation of the widths of the first micro-reflectors and the second micro-reflectors; -
FIG. 6 is an exploded view of a backlight module incorporated with the brightness enhancement film of the present invention; -
FIG. 7 is a cross-sectional view of the present invention showing the first micro-reflectors and the second micro-reflectors with two different base angles; -
FIG. 8 is a luminosity plot of a backlight module with or without the brightness enhancement film; and -
FIG. 9 is an exploded view of the prior art. - As shown in
FIGS. 1 and 2 , abrightness enhancement film 1 of the present invention comprises a pair offirst sides 11 corresponding to each other, a pair of second sides corresponding to each other, and a number of first micro-reflectors 13 and second micro-reflectors 14 disposed side by side. Each of the first micro-reflectors 13 has acrest line 131, and each of the second micro-reflectors 14 has acrest line 141. The first micro-reflectors 13 have first average height and width which are different from second average height and width of the second micro-reflectors 14. The first average height of the first micro-reflectors 13 means the average value of the perpendicular heights of the micro-reflectors 13. The second average height of the second micro-reflectors 14 means the average value of the perpendicular heights of the second micro-reflectors 14. The first average width of the first micro-reflectors 13 means the average value of the width taken from the cross-section at the bottom of each of thefirst micro-reflectors 13. The second average width of the second micro-reflectors 14 means the average value of the width taken from the cross-section at the bottom of each of thesecond micro-reflectors 14. If the view is taken from thefirst side 11 of thebrightness enhancement film 1, the cross-sections of the first micro-reflectors 13 and the second micro-reflectors 14 are in triangular shapes, as shown inFIG. 3 . Each of the first micro-reflectors 13 and thesecond micro-reflectors 14 has two base angles a and p which are same. If the view is taken from thesecond side 12, thecrest lines FIG. 4 . The first micro-reflector 13 has apeak 133 and avalley 132, and thesecond micro-reflector 14 has apeak 143 and avalley 142. Thevalley 132 of the first micro-reflector 13 has an equal height with respect to thepeak 143 of thesecond micro-reflector 14. The widths of the first micro-reflector 13 and the second micro-reflector 14 vary along with thevalleys peaks FIG. 5 . This forms a neighboring line D between the first micro-reflector 13 and the second micro-reflector 14 in a wave shape. - As shown in
FIG. 6 , thebrightness enhancement film 1 of the present invention is coupled with a light guide plate A1, a light source A2, a reflector A3, and a diffusion film A4 to form a backlight module of a LCD display. The light resource A2 is disposed at one side of the light guide plate A1 to provide light ray emitting into the light guide plate A1 from a ray entering side A6. The fully reflection of the ray in the light guide plate A1 will be transferred therein, thus the reflecting ray emits from a ray displaying side A7 through the diffusion film A4, thepeaks micro-reflectors 14 of thebrightness enhancing film 1, and out from a LCD panel B. - Another example is that the
valley 132 of the first micro-reflector 13 may have a different height with respect to thepeak 143 of the second micro-reflector 14, which also provides the same effect. - Another embodiment of the present invention, as shown in
FIG. 7 , is substantially similar to the aforesaid embodiment with the exceptions described hereinafter. The cross-section of each of the first micro-reflectors 13 and thesecond micro-reflectors 14 of thebrightness enhancing film 1 is triangle having two different base angles α and β, which also provides the same effect. -
FIG. 8 is luminosity plot of a backlight module, luminance 3240 nits without thebrightness enhancement film 1 and luminance 5694 nits with thebrightness enhancement film 1. The gain has an average of 1.76 times.
Claims (14)
Priority Applications (1)
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US12/314,533 US7751679B1 (en) | 2008-12-12 | 2008-12-12 | Brightness enhancement film and backlight module |
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US12/314,533 US7751679B1 (en) | 2008-12-12 | 2008-12-12 | Brightness enhancement film and backlight module |
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US20100150509A1 true US20100150509A1 (en) | 2010-06-17 |
US7751679B1 US7751679B1 (en) | 2010-07-06 |
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US12/314,533 Expired - Fee Related US7751679B1 (en) | 2008-12-12 | 2008-12-12 | Brightness enhancement film and backlight module |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106950626A (en) * | 2017-05-08 | 2017-07-14 | 苏州高德辰光电科技有限公司 | A kind of optical reflection film and preparation method thereof and photovoltaic cell component |
CN108400193A (en) * | 2018-04-17 | 2018-08-14 | 上海玛企电子科技有限公司 | A kind of reflectance coating and photovoltaic module for photovoltaic module |
US20190146278A1 (en) * | 2017-11-13 | 2019-05-16 | Lg Display Co., Ltd. | Deformed liquid crystal display device |
CN111176013A (en) * | 2019-12-19 | 2020-05-19 | 京东方科技集团股份有限公司 | Brightness enhancement film, backlight module and display device |
Citations (7)
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---|---|---|---|---|
US5771328A (en) * | 1995-03-03 | 1998-06-23 | Minnesota Mining And Manufacturing Company | Light directing film having variable height structured surface and light directing article constructed therefrom |
US6576887B2 (en) * | 2001-08-15 | 2003-06-10 | 3M Innovative Properties Company | Light guide for use with backlit display |
US7052168B2 (en) * | 2003-12-17 | 2006-05-30 | 3M Innovative Properties Company | Illumination device |
US7221847B2 (en) * | 1999-10-08 | 2007-05-22 | 3M Innovative Properties Company | Optical elements having programmed optical structures |
US7397605B2 (en) * | 2006-03-31 | 2008-07-08 | Gamma Optical Co., Ltd. | Structure of optic film |
US7431493B2 (en) * | 2001-07-13 | 2008-10-07 | Samsung Electronics Co., Ltd. | Light guiding plate with brightness enhancement means and liquid crystal display |
US7618164B2 (en) * | 2005-06-09 | 2009-11-17 | Ubright Optronics Corporation | Moire reducing optical substrates with irregular prism structures |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4096540B2 (en) * | 2001-09-27 | 2008-06-04 | カシオ計算機株式会社 | Surface light source |
-
2008
- 2008-12-12 US US12/314,533 patent/US7751679B1/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5771328A (en) * | 1995-03-03 | 1998-06-23 | Minnesota Mining And Manufacturing Company | Light directing film having variable height structured surface and light directing article constructed therefrom |
US7221847B2 (en) * | 1999-10-08 | 2007-05-22 | 3M Innovative Properties Company | Optical elements having programmed optical structures |
US7431493B2 (en) * | 2001-07-13 | 2008-10-07 | Samsung Electronics Co., Ltd. | Light guiding plate with brightness enhancement means and liquid crystal display |
US6576887B2 (en) * | 2001-08-15 | 2003-06-10 | 3M Innovative Properties Company | Light guide for use with backlit display |
US7052168B2 (en) * | 2003-12-17 | 2006-05-30 | 3M Innovative Properties Company | Illumination device |
US7618164B2 (en) * | 2005-06-09 | 2009-11-17 | Ubright Optronics Corporation | Moire reducing optical substrates with irregular prism structures |
US7397605B2 (en) * | 2006-03-31 | 2008-07-08 | Gamma Optical Co., Ltd. | Structure of optic film |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106950626A (en) * | 2017-05-08 | 2017-07-14 | 苏州高德辰光电科技有限公司 | A kind of optical reflection film and preparation method thereof and photovoltaic cell component |
US20190146278A1 (en) * | 2017-11-13 | 2019-05-16 | Lg Display Co., Ltd. | Deformed liquid crystal display device |
US10698259B2 (en) * | 2017-11-13 | 2020-06-30 | Lg Display Co., Ltd. | Deformed liquid crystal display device |
CN108400193A (en) * | 2018-04-17 | 2018-08-14 | 上海玛企电子科技有限公司 | A kind of reflectance coating and photovoltaic module for photovoltaic module |
CN111176013A (en) * | 2019-12-19 | 2020-05-19 | 京东方科技集团股份有限公司 | Brightness enhancement film, backlight module and display device |
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US7751679B1 (en) | 2010-07-06 |
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AS | Assignment |
Owner name: UNIVACCO TECHNOLOGY INC.,TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LIN, CHI-FENG;CHEN, YI-FAN;REEL/FRAME:022029/0051 Effective date: 20081203 Owner name: NATIONAL APPLIED RESEARCH LABORATORIES,TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LIN, CHI-FENG;CHEN, YI-FAN;REEL/FRAME:022029/0051 Effective date: 20081203 Owner name: UNIVACCO TECHNOLOGY INC., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LIN, CHI-FENG;CHEN, YI-FAN;REEL/FRAME:022029/0051 Effective date: 20081203 Owner name: NATIONAL APPLIED RESEARCH LABORATORIES, TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LIN, CHI-FENG;CHEN, YI-FAN;REEL/FRAME:022029/0051 Effective date: 20081203 |
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STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
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Effective date: 20140706 |