US20040228603A1 - Backlighting device - Google Patents
Backlighting device Download PDFInfo
- Publication number
- US20040228603A1 US20040228603A1 US10/869,117 US86911704A US2004228603A1 US 20040228603 A1 US20040228603 A1 US 20040228603A1 US 86911704 A US86911704 A US 86911704A US 2004228603 A1 US2004228603 A1 US 2004228603A1
- Authority
- US
- United States
- Prior art keywords
- microstructures
- guide plate
- light guide
- light
- backlighting device
- 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
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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
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
-
- 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
Definitions
- the invention relates to a backlighting device, more particularly to a backlighting device capable of providing uniform brightness.
- the display panels used in mobile phones, PDAs, digital cameras, and the like normally operate in conjunction with a backlighting source.
- light is radiated from a plurality of point light sources, such as light emitting diodes, is incident on a light guide plate, and is then reflected from the light guide plate to the display panel.
- the light emitted from the light emitting diodes 11 is seldom uniformly incident on the light guide plate 12 .
- the light from the light emitting diodes 11 is incident on the light guide plate 12 in a manner that the illuminance is decreased gradually away from a location of the light guide plate 12 where the light is incident along a direction transverse to the light incident direction.
- Relatively bright areas 13 and relatively dark areas 14 are hence formed on the light guide plate 12 , which will in turn form gray areas on the display panel. Therefore, the aforesaid light guide plate 12 is modified in the art by treating the light guide panel 12 with dotting or sand-blasting to form microstructures 15 , which are distributed in a manner of varying density, depth or size.
- the light guide plate 12 having a uniform brightness effect can hardly be obtained in the aforesaid method.
- the backlighting device includes a light guide plate having a first side and a second side opposite to the first side, and a point light source to generate light incident on the first side of the light guide plate.
- the light guide plate has a plurality of longitudinal diffraction microstructures which are arranged and oriented according to the location of the point light source.
- the microstructures are varied gradually at least in size, position, density, or shape relative to the location of the point light source.
- the microstructures which are varied gradually at least in size, position, density, or shape, function to regulate and adjust the illuminance of bright and dark areas in the light guide plate so as to provide uniform brightness.
- the backlighting device includes a light guide plate having a first side and a second side opposite to the first side, and a point light source disposed adjacent to the first side to generate light incident on the first side.
- the light guide plate further has a surface extending between the first and second sides, and a plurality of diffraction microstructures formed in the surface.
- the surface has a first illuminating region, and two second illuminating regions on two sides of the first illuminating region.
- the light enters the light guide plate in the first illuminating region.
- the microstructures are varied gradually at least in size, position, density, or shape from the first illuminating region toward the second illuminating regions.
- the microstructures function to regulate and adjust the illuminance of bright and dark areas in the light guide plate so as to provide uniform brightness.
- FIG. 1 is a schematic view of a conventional backlighting device
- FIG. 2 is a schematic view of the first preferred embodiment of a backlighting device according to this invention.
- FIG. 3A is a fragmentary schematic view of an area (A) of a light guide plate of the first preferred embodiment of FIG. 2;
- FIG. 3B is a schematic view of the light guide plate of FIG. 3A;
- FIG. 4A is a fragmentary schematic view of an area (B) of the light guide plate of the first preferred embodiment of FIG. 2;
- FIG. 4B is a schematic view of the light guide plate of FIG. 4A;
- FIG. 5 is a fragmentary schematic view of a light guide plate of the second preferred embodiment of a backlighting device according to this invention.
- FIG. 6 is a fragmentary schematic view of a light guide plate of the third preferred embodiment of a backlighting device according to this invention.
- the first preferred embodiment of a backlighting device is shown to include a light guide plate 3 and a plurality of point light sources 2 .
- the light guide plate 3 has a first side 31 and a second side 32 opposite to the first side 31 .
- the point light sources 2 are disposed adjacent to the first side 31 at intervals to generate light incident on the first side 31 of the light guide plate 3 .
- the light guide plate 3 has a surface 31 extending between the first and second sides 31 , 32 , and a plurality of longitudinal diffraction microstructures 4 extending from the first side 31 to the second side 32 on the surface 31 .
- the light guide plate 3 further includes a plurality of first illuminating regions (A) each of which extends to the second side 32 from a location of the first side 31 where the light is incident, and a plurality of second illuminating regions (B) each of which is provided between two adjacent ones of the first illuminating regions (A).
- the second illuminating regions (B) are generally darker than the first illuminating regions (A) adjacent to the first side 31 of the light guide plate 3 .
- the microstructures 4 are arranged and oriented according to the location of the point light sources 2 .
- the microstructures 4 are varied gradually at least in size, position, density, or shape relatively to the location of the point light sources 2 .
- the microstructures 4 when light is incident on the light guide plate 3 from the point light sources 2 , the microstructures 4 , which are varied gradually at least in size, position, density, or shape in a direction transverse to a longitudinal direction of the microstructures 4 from each of the first illuminating regions (A) towards an adjacent one of the second illuminating regions (B), function to regulate and adjust the illuminance of bright and dark areas in the light guide plate 3 so as to provide uniform brightness.
- the longitudinal diffraction microstructures 4 are formed as ridges that project from the surface 31 of the light guide plate 3 and that are tapered outward from the surface 31 .
- the longitudinal diffraction microstructures 4 can be formed as grooves that are formed in the surface 31 of the light guide plate 3 and that are tapered inward from the surface 31 .
- the longitudinal diffraction microstructures 4 can be provided on at least one of the top and bottom surfaces 31 of the light guide plate 3 .
- the microstructures 4 extend from the first side 31 to the second side 32 in a direction along which the light is incident on the light guide plate 3 .
- Each of the microstructures 4 has a height (H) or depth (D) from the surface 31 , and an inclined face 43 which is inclined with respect to the surface 31 by an angle (R).
- the microstructures 4 are spaced apart from each other by a distance (P).
- the microstructures 4 are distributed with a density which changes gradually from each of the first illuminating regions (A) to an adjacent one of the second illuminating regions (B) (i.e., towards two sides from a light entrance region of the light guide plate 3 as a center). The density is varied gradually by controlling the height (H) or depth (D), the angle (R), or the distance (P).
- the angle (R) of the inclined faces 43 of the ridges is chosen as a parameter to be varied to achieve uniform brightness for the light guide plate 3
- the height (H) or depth (D) and the distance (P) are kept constant, and the angle (R) of the microstructure 4 is increased gradually from each of the first illuminating regions (A) to an adjacent one of the second illuminating regions (B).
- the distance (P) between the microstructures 4 is chosen as the parameter to be varied to achieve uniform brightness for the light guide plate 3
- the height (H) or depth (D) and the angle (R) are kept constant, and the distance (P) is decreased gradually from each of the first illuminating regions (A) to an adjacent one of the second illuminating regions (B).
- the angle (R) and the distance (P) are kept constant, and the height (H) of the ridges is increased from each of the first illuminating regions (A) to an adjacent one of the second illuminating regions (B).
- the angle (R) and the distance (P) are kept constant, and the depth (D) of the grooves is increased from each of the first illuminating regions (A) to an adjacent one of the second illuminating regions (B).
- the aforesaid variations- can be simulated by using a computer to compare the illuminance between the first and second illuminating regions (A,B) before manufacturing the light guide plate 3 .
- the backlighting device of this invention can overcome the aforesaid shortcomings of the prior art.
Abstract
Description
- 1. Field of the Invention
- The invention relates to a backlighting device, more particularly to a backlighting device capable of providing uniform brightness.
- 2. Description of the Related Art
- The display panels used in mobile phones, PDAs, digital cameras, and the like normally operate in conjunction with a backlighting source. Generally, light is radiated from a plurality of point light sources, such as light emitting diodes, is incident on a light guide plate, and is then reflected from the light guide plate to the display panel. Referring to FIG. 1, the light emitted from the
light emitting diodes 11 is seldom uniformly incident on thelight guide plate 12. In other words, the light from thelight emitting diodes 11 is incident on thelight guide plate 12 in a manner that the illuminance is decreased gradually away from a location of thelight guide plate 12 where the light is incident along a direction transverse to the light incident direction. Relativelybright areas 13 and relativelydark areas 14 are hence formed on thelight guide plate 12, which will in turn form gray areas on the display panel. Therefore, the aforesaidlight guide plate 12 is modified in the art by treating thelight guide panel 12 with dotting or sand-blasting to formmicrostructures 15, which are distributed in a manner of varying density, depth or size. However, in order to obtain an optimum effect for a specificlight guide plate 12, it is required to perform a series of tests before producing thelight guide plate 12. Therefore, it is not easy to mass-produce thelight guide plate 12. Furthermore, thelight guide plate 12 having a uniform brightness effect can hardly be obtained in the aforesaid method. - Therefore, it is an object of the present invention to provide a backlighting device capable of overcoming the aforesaid disadvantages of the prior art.
- In the first aspect of this invention, the backlighting device according to this invention includes a light guide plate having a first side and a second side opposite to the first side, and a point light source to generate light incident on the first side of the light guide plate. The light guide plate has a plurality of longitudinal diffraction microstructures which are arranged and oriented according to the location of the point light source. The microstructures are varied gradually at least in size, position, density, or shape relative to the location of the point light source. When light is incident on the light guide plate from the point light source, the microstructures, which are varied gradually at least in size, position, density, or shape, function to regulate and adjust the illuminance of bright and dark areas in the light guide plate so as to provide uniform brightness.
- In the second aspect of this invention, the backlighting device according to this invention includes a light guide plate having a first side and a second side opposite to the first side, and a point light source disposed adjacent to the first side to generate light incident on the first side. The light guide plate further has a surface extending between the first and second sides, and a plurality of diffraction microstructures formed in the surface. The surface has a first illuminating region, and two second illuminating regions on two sides of the first illuminating region. The light enters the light guide plate in the first illuminating region. The microstructures are varied gradually at least in size, position, density, or shape from the first illuminating region toward the second illuminating regions. When light is incident on the light guide plate from the point light source, the microstructures function to regulate and adjust the illuminance of bright and dark areas in the light guide plate so as to provide uniform brightness.
- Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiments with reference to the accompanying drawings, of which:
- FIG. 1 is a schematic view of a conventional backlighting device;
- FIG. 2 is a schematic view of the first preferred embodiment of a backlighting device according to this invention;
- FIG. 3A is a fragmentary schematic view of an area (A) of a light guide plate of the first preferred embodiment of FIG. 2;
- FIG. 3B is a schematic view of the light guide plate of FIG. 3A;
- FIG. 4A is a fragmentary schematic view of an area (B) of the light guide plate of the first preferred embodiment of FIG. 2;
- FIG. 4B is a schematic view of the light guide plate of FIG. 4A;
- FIG. 5 is a fragmentary schematic view of a light guide plate of the second preferred embodiment of a backlighting device according to this invention; and
- FIG. 6 is a fragmentary schematic view of a light guide plate of the third preferred embodiment of a backlighting device according to this invention.
- Referring to FIG. 2, the first preferred embodiment of a backlighting device according to this invention is shown to include a
light guide plate 3 and a plurality ofpoint light sources 2. Thelight guide plate 3 has afirst side 31 and asecond side 32 opposite to thefirst side 31. Thepoint light sources 2 are disposed adjacent to thefirst side 31 at intervals to generate light incident on thefirst side 31 of thelight guide plate 3. In practice, light emitting diodes are used as thepoint light sources 2, the number thereof depending on the size of a display panel (not shown) Thelight guide plate 3 has asurface 31 extending between the first andsecond sides longitudinal diffraction microstructures 4 extending from thefirst side 31 to thesecond side 32 on thesurface 31. Thelight guide plate 3 further includes a plurality of first illuminating regions (A) each of which extends to thesecond side 32 from a location of thefirst side 31 where the light is incident, and a plurality of second illuminating regions (B) each of which is provided between two adjacent ones of the first illuminating regions (A). The second illuminating regions (B) are generally darker than the first illuminating regions (A) adjacent to thefirst side 31 of thelight guide plate 3. - Referring to FIGS. 2, 3A,3B, 4A, and 4B, the
microstructures 4 are arranged and oriented according to the location of thepoint light sources 2. Themicrostructures 4 are varied gradually at least in size, position, density, or shape relatively to the location of thepoint light sources 2. Therefore, when light is incident on thelight guide plate 3 from thepoint light sources 2, themicrostructures 4, which are varied gradually at least in size, position, density, or shape in a direction transverse to a longitudinal direction of themicrostructures 4 from each of the first illuminating regions (A) towards an adjacent one of the second illuminating regions (B), function to regulate and adjust the illuminance of bright and dark areas in thelight guide plate 3 so as to provide uniform brightness. - Referring to FIGS. 3B, 4B, and6, in the preferred embodiment of this invention, the
longitudinal diffraction microstructures 4 are formed as ridges that project from thesurface 31 of thelight guide plate 3 and that are tapered outward from thesurface 31. Alternatively, referring to FIG. 5, thelongitudinal diffraction microstructures 4 can be formed as grooves that are formed in thesurface 31 of thelight guide plate 3 and that are tapered inward from thesurface 31. Thelongitudinal diffraction microstructures 4 can be provided on at least one of the top andbottom surfaces 31 of thelight guide plate 3. - Referring to FIGS. 2, 3B,4B, and 5, the
microstructures 4 extend from thefirst side 31 to thesecond side 32 in a direction along which the light is incident on thelight guide plate 3. Each of themicrostructures 4 has a height (H) or depth (D) from thesurface 31, and aninclined face 43 which is inclined with respect to thesurface 31 by an angle (R). Themicrostructures 4 are spaced apart from each other by a distance (P). Themicrostructures 4 are distributed with a density which changes gradually from each of the first illuminating regions (A) to an adjacent one of the second illuminating regions (B) (i.e., towards two sides from a light entrance region of thelight guide plate 3 as a center). The density is varied gradually by controlling the height (H) or depth (D), the angle (R), or the distance (P). - When the angle (R) of the
inclined faces 43 of the ridges is chosen as a parameter to be varied to achieve uniform brightness for thelight guide plate 3, the height (H) or depth (D) and the distance (P) are kept constant, and the angle (R) of themicrostructure 4 is increased gradually from each of the first illuminating regions (A) to an adjacent one of the second illuminating regions (B). When the distance (P) between themicrostructures 4 is chosen as the parameter to be varied to achieve uniform brightness for thelight guide plate 3, the height (H) or depth (D) and the angle (R) are kept constant, and the distance (P) is decreased gradually from each of the first illuminating regions (A) to an adjacent one of the second illuminating regions (B). When the height (H) of the ridges is chosen as the parameter to be varied to achieve uniform brightness for thelight guide plate 3, the angle (R) and the distance (P) are kept constant, and the height (H) of the ridges is increased from each of the first illuminating regions (A) to an adjacent one of the second illuminating regions (B). Similarly, when the depth (D) of the grooves is chosen as the parameter to be varied to achieve uniform brightness for thelight guide plate 3, the angle (R) and the distance (P) are kept constant, and the depth (D) of the grooves is increased from each of the first illuminating regions (A) to an adjacent one of the second illuminating regions (B). - In practice, the aforesaid variations- can be simulated by using a computer to compare the illuminance between the first and second illuminating regions (A,B) before manufacturing the
light guide plate 3. - In view of the aforesaid, since the optimum configuration of the
light guide plate 3 can be obtained by computer simulation, the backlighting device of this invention can overcome the aforesaid shortcomings of the prior art. - While the present invention has been described in connection with what is considered the most practical and preferred embodiments, it is understood that this invention is not limited to the disclosed embodiments but is intended to cover various arrangements included within the spirit and scope of the broadest interpretation so as to encompass all such modifications and equivalent arrangements.
Claims (14)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW092203411U TW595723U (en) | 2003-03-06 | 2003-03-06 | Adjusting device for brightness and darkness area of point source |
TW092203411 | 2003-03-06 |
Publications (3)
Publication Number | Publication Date |
---|---|
US20040228603A1 true US20040228603A1 (en) | 2004-11-18 |
US20050111814A9 US20050111814A9 (en) | 2005-05-26 |
US7164842B2 US7164842B2 (en) | 2007-01-16 |
Family
ID=33415076
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/869,117 Expired - Fee Related US7164842B2 (en) | 2003-03-06 | 2004-06-16 | Backlighting device |
Country Status (2)
Country | Link |
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US (1) | US7164842B2 (en) |
TW (1) | TW595723U (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US20080031011A1 (en) * | 2004-09-28 | 2008-02-07 | Kentaro Hayashi | Light Guide For Surface Light Source Device And Surface Light Source Device |
US20080137373A1 (en) * | 2006-12-08 | 2008-06-12 | Hon Hai Precision Industry Co., Ltd. | Light guide plate and backlight module having same |
US20120274874A1 (en) * | 2011-04-29 | 2012-11-01 | Shenzhen China Star Optoelectronics Technology Co. Ltd. | Backlight Module and Liquid Crystal Display Device |
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JP4552956B2 (en) * | 2007-04-03 | 2010-09-29 | セイコーエプソン株式会社 | Lighting device and projector |
US8130341B2 (en) * | 2009-08-25 | 2012-03-06 | Sharp Kabushiki Kaisha | Uniform diffractive backlight |
US8506153B2 (en) * | 2011-04-26 | 2013-08-13 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Light guide panel and back light module thereof |
US9028120B2 (en) | 2011-08-08 | 2015-05-12 | Quarkstar Llc | Illumination devices including multiple light emitting elements |
US9081125B2 (en) | 2011-08-08 | 2015-07-14 | Quarkstar Llc | Illumination devices including multiple light emitting elements |
US8573823B2 (en) | 2011-08-08 | 2013-11-05 | Quarkstar Llc | Solid-state luminaire |
CN105388556A (en) * | 2014-08-20 | 2016-03-09 | 瑞仪光电股份有限公司 | Light guide plate and light source module |
TWI481915B (en) | 2013-08-20 | 2015-04-21 | Radiant Opto Electronics Corp | Light guide plate with multidirectional structures |
US8834004B2 (en) | 2012-08-13 | 2014-09-16 | 3M Innovative Properties Company | Lighting devices with patterned printing of diffractive extraction features |
US8807817B2 (en) | 2012-08-13 | 2014-08-19 | 3M Innovative Properties Company | Colorful diffractive luminaires providing white light illumination |
US8944662B2 (en) | 2012-08-13 | 2015-02-03 | 3M Innovative Properties Company | Diffractive luminaires |
US9625637B2 (en) | 2012-08-13 | 2017-04-18 | 3M Innovative Properties Company | Diffractive lighting devices with 3-dimensional appearance |
EP3462080A1 (en) | 2012-09-13 | 2019-04-03 | Quarkstar LLC | Illumination systems providing direct and indirect illumination |
WO2014043369A2 (en) | 2012-09-13 | 2014-03-20 | Quarkstar Llc | Devices for workspace illumination |
WO2014124285A2 (en) | 2013-02-08 | 2014-08-14 | Quarkstar Llc | Illumination device providing direct and indirect illumination |
WO2014172571A2 (en) | 2013-04-19 | 2014-10-23 | Quarkstar Llc | Illumination devices with adjustable optical elements |
EP3273145B1 (en) | 2013-07-18 | 2019-09-04 | Quarkstar LLC | Luminaire module with multiple light guide elements |
WO2015042188A1 (en) | 2013-09-17 | 2015-03-26 | Quarkstar Llc | Luminaire with optical modifier |
CN106996544B (en) | 2016-01-26 | 2019-09-06 | 瑞仪光电(苏州)有限公司 | Prismatic lens, backlight module |
CN108779899A (en) * | 2016-03-18 | 2018-11-09 | 夏普株式会社 | Lighting device and display device |
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US20080031011A1 (en) * | 2004-09-28 | 2008-02-07 | Kentaro Hayashi | Light Guide For Surface Light Source Device And Surface Light Source Device |
US7815357B2 (en) * | 2004-09-28 | 2010-10-19 | Mitsubishi Rayon Co., Ltd. | Light guide for surface light source device and surface light source device |
US20080137373A1 (en) * | 2006-12-08 | 2008-06-12 | Hon Hai Precision Industry Co., Ltd. | Light guide plate and backlight module having same |
US20120274874A1 (en) * | 2011-04-29 | 2012-11-01 | Shenzhen China Star Optoelectronics Technology Co. Ltd. | Backlight Module and Liquid Crystal Display Device |
Also Published As
Publication number | Publication date |
---|---|
US7164842B2 (en) | 2007-01-16 |
TW595723U (en) | 2004-06-21 |
US20050111814A9 (en) | 2005-05-26 |
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