KR20090026671A - Lens diffusing point source of light for backlight unit - Google Patents
Lens diffusing point source of light for backlight unitInfo
- Publication number
- KR20090026671A KR20090026671A KR1020070091785A KR20070091785A KR20090026671A KR 20090026671 A KR20090026671 A KR 20090026671A KR 1020070091785 A KR1020070091785 A KR 1020070091785A KR 20070091785 A KR20070091785 A KR 20070091785A KR 20090026671 A KR20090026671 A KR 20090026671A
- Authority
- KR
- South Korea
- Prior art keywords
- lens
- light source
- backlight
- point light
- led
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
-
- 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
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
-
- 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
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
- G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
-
- 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
-
- 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
- G02B6/0066—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 characterised by the light source being coupled to the light guide
- G02B6/0073—Light emitting diode [LED]
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Planar Illumination Modules (AREA)
Abstract
The present invention relates to a point light source diffuser lens for a backlight, and more particularly, a lens used for a point light source such as a light emitting diode (LED). The present invention relates to a point light source diffuser lens for a backlight, in which a uniform illumination or brightness can be obtained on an optical panel facing an LED array by adding and forming a fine microbead.
The lenses may be arranged in a one-to-one correspondence with each point light source, or may be installed as one lens plate on the entire point light source array.
Description
The present invention relates to a point light source diffuser lens for a backlight, and more particularly, a lens used for a point light source such as a light emitting diode (LED). The present invention relates to a point light source diffuser lens for a backlight, in which a uniform illumination or brightness can be obtained on an optical panel facing an LED array by adding and forming a fine microbead.
Liquid crystal displays (LCDs), display panels, and the like include light sources or arrays of light sources that provide light under an optical panel. The module that provides the light is called the backlight unit. As a light source, the cold cathode fluorescent lamp (CCFL) has been mainly adopted until now, but mercury is not included as the use of mercury-containing lamps is gradually limited. Attempts are being made to replace cold-cathode fluorescent lamps with LEDs, which are environmentally friendly, can operate at low voltage, are suitable for low power consumption, and have better color gamut.
In addition, as a mobile application, a small LCD and a notebook or desktop application, BLU adopts a side emitting method in which light emitted from a light source is incident horizontally on an optical panel (light guide plate). Top Emitting is adopted, in which light is incident on the optical panel vertically from the LED.
1A and 1B are diagrams illustrating the concept of a side emission type BLU and an upward emission type BLU.
As shown in Fig. 1A, in the side emission type BLU light source device, the light 2 from the LED 1 light source enters the incident surface 3a which is one of the side surfaces of the light guide plate 3. The light 2 incident on the light guide plate 3 is bent upward by the scattering pattern 4 formed on the bottom surface of the light guide plate 3 to enter the LCD panel (not shown). In this case, various optical sheets (not shown), such as a diffusion sheet and a prism sheet, are placed on the light guide plate 3 so that the luminance of light incident on the LCD panel is uniform.
As shown in Fig. 1B, the BLU of the upward emission type uses the LED 5 light source to inject light 6 from the planarly arranged light source LED 5 light sources into the optical panel 7 above. It is arranged in the lower part of (7). Various optical sheets (not shown), such as a diffusion sheet and a prism sheet, may be placed on the optical panel 7 so that light exiting the BLU is incident on the LCD panel with uniform brightness.
FIG. 2A shows the typical intensity of light emitted from a typical LED as a function of the direction angle [theta], and FIG. 2B is shown by the LED arrangements 10a, 10b, 10c, 10d, ... of FIG. 2a. It is a figure which shows the illuminance obtained from the said optical panel or sheet | seat.
In practice, the LEDs are arranged two-dimensionally on a PCB (not shown), but for the sake of simplicity, the one-dimensional arrangement is shown here.
In general, as shown in FIG. 2A, the intensity of light is the highest directly above the LED, that is, in the direction in which the direction angle θ is zero.
Computing the illuminance by summing the light emitted from all such LEDs, it can be seen that the illuminance or luminance is not uniform on the optical panel, as shown in Figure 2b. That is, the illuminance is the largest right above the LED (11a, 11b, 11c, 11d, ...), and the lowest illuminance between the LED (12a, 12b, 12c, 12d, ...). The reason is basically that the intensity distribution of the light emitted from the LED depends on the direction angle [theta]. In addition, the closer the distance between the LED array and the optical panel, the greater the unevenness of illuminance.
In order to alleviate the above problem, a technique of attaching a lens to an LED has been proposed.
3A and 3B show an example of a conventional LED lens.
As shown in FIG. 3A, the conventional LED lens 21 bends the light 22 strongly emitted upwardly from the LED 20 laterally by total reflection or refraction, and thus, compared with the case without the lens, A relatively uniform illuminance or luminance is obtained on a panel (not shown).
In addition, as shown in Fig. 3b, the conventional LED lens 26 is to fold the light 27 strongly emitted upward from the LED 25 to the side by using total reflection or refraction, so that when there is no lens In comparison, relatively uniform illuminance or luminance can be obtained on an optical panel (not shown).
The lens 21 of FIG. 3A has one valley 21a, and the lens 26 of FIG. 3B has two valleys, so that more uniform illuminance or luminance can be obtained.
However, the lenses 21 and 26 each include a plurality of angled edges 21a, 21b, 21c, 26a, 26b, 26c, and 26d, so that the light passing through this portion is used to adjust the illuminance or luminance on the optical panel. There is a problem that unevenness of brightness due to nonuniformity occurs.
Such spots have a problem that these spots are not completely removed even on a BLU for LCD, which should be uniform in brightness even when the diffusion sheet is placed on the optical panel.
In addition, as the distance between the LED light source and the optical panel is reduced in order to reduce the thickness of the LCD BLU, this problem becomes larger.
The present invention is to solve the above problems, take the shape of the concave lens in the region near the center axis of the lens to be put on the LED, but by adding diffused microbeads inside the strong light coming from the direction near the center axis side It is an object of the present invention to provide a point light source diffuser lens for a backlight such that uniform illuminance or luminance can be obtained on an optical panel facing an LED array.
In order to achieve the above object, an embodiment of a point light source diffuser lens for a backlight according to the present invention is an LCD backlight unit (BLU) including a PCB substrate, a light source, a lens, an optical panel, and a plurality of optical sheets. The lens is axially symmetrical and a region close to the central axis of the lens is configured to have a concave lens shape so as to diffuse the strong light emitted from the light source onto the central axis to the periphery of the central axis.
Another embodiment according to the point light source diffusion lens for backlight according to the present invention, in the LCD backlight unit (BLU) consisting of a PCB substrate, a light source, a lens, an optical panel, and a plurality of other optical sheets, the lens is axial symmetry And a region close to the central axis of the lens has a concave lens shape, and further includes light diffusing microbeads inside the lens to diffuse the strong light emitted from the light source onto the central axis to the periphery of the central axis. It is characterized by the configuration.
In the present invention, the microbeads are distributed only in an area adjacent to the central axis of the lens.
In the present invention, it is characterized in that it further comprises a reflective film formed on the PCB substrate in the region corresponding to the lens except the light source.
In the present invention, the lens is characterized in that the one-to-one correspondence is configured so that the central axis and the light source.
In the present invention, the lens is characterized in that the lens plate of one plate corresponding to the plurality of light source arrangement.
In the present invention, the lens is characterized by using any one of glass, silicon, or resin material.
In the present invention, the refractive index of the lens is characterized in that the range of 1.4 to 2.0.
In the present invention, the diameter of the fine beads is characterized in that the range of 1μm to 1mm.
In the present invention, the refractive index of the fine beads is characterized in that the range of 1.4 to 2.0.
In the present invention, the refractive index of the microbead is characterized in that it is configured to have a difference from 0.01 to 0.2 than the refractive index of the lens.
In the present invention, the fine beads are characterized by using any one of glass, silicon, or resin material.
The point light source diffusion lens for backlight according to the present invention diffuses the light of the light emitting element focused on the central axis in a direction far from the central axis to obtain a more uniform illuminance or luminance distribution on the optical panel on the top of the LED array It works.
1a and 1b is a view showing the concept of the side emission type BLU and the upward emission BLU,
2a shows the typical intensity of light emitted from a typical LED as a function of direction angle,
FIG. 2B shows the illuminance obtained from the optical panel or sheet thereon by the LED arrangement of FIG. 2A;
3a and 3b is a view showing an example of a conventional lens for LED,
4 is a cross-sectional view showing a point light source diffusion lens for backlight according to an embodiment of the present invention;
FIG. 5 is a view illustrating a hot spot formed in illuminance or luminance by an angled edge portion of the lens of FIG. 4; FIG.
FIG. 6 is a view illustrating a structure in which fine diffuser beads are distributed in a point light source diffuser lens for a backlight according to an embodiment of the present invention; FIG.
FIG. 7 is a view illustrating a structure in which fine diffuser beads are distributed in a portion of a point light source diffusion lens for backlight according to an embodiment of the present invention.
*** Explanation of symbols for the main parts of the drawing ***
1, 5, 10, 10a to 10d: LED 2, 6: light
3: light guide plate 4: scattering pattern
7: optical panel 20, 25: LED
21, 26: lens 22, 27: light
21a to 21c angled corners 26a to 26d angled corners
34: optical panel 35: central axis
36: hot spot 37: surrounding area
100, 200, 300: lens 110, 210, 310: concave lens shape
120, 220, 320: Convex lens shape 130, 230, 330: LED
250, 350: fine beads
Hereinafter, a preferred embodiment of a point light source diffuser lens for a backlight according to the present invention will be described in detail with reference to the accompanying drawings.
4 is a cross-sectional view illustrating a point light source diffuser lens for a backlight according to an embodiment of the present invention.
As shown, the backlight point light source diffusion lens 100 according to the present invention is configured to match the central axis of the LED 130, the point light source arranged on the PCB substrate.
Typically, the LED 130 is preferably configured to emit white light, and may be any one of red (R), green (G), and blue (B), or light in which two or more colors are mixed. Preferably configured to release.
The lens 100 is preferably formed in a concave lens shape 110 in a portion facing the central axis of the LED 130, which is a point light source, the convex lens shape 120 or any other portion away from the central axis It may be formed in the shape of. At this time, the inner surface of the lens 100 is preferably in contact with the LED 130 or spaced at a predetermined interval to be formed concave.
In addition, although not shown, the lens 100 may be individually arranged on the point light source array in a one-to-one correspondence with each of the point light sources LEDs 130, and one lens on the entire point light source array. Plates (not shown) may be disposed. In this case, the lens 100 is preferably arranged in the form of any one of a triangle, a square (matrix), a hexagon, or a zigzag form under the optical panel (not shown) together with the LED 130 to be used in the backlight unit. .
In addition, the lens 100 is preferably configured using a material having good light transmittance. More preferably, glass, silicon, or polycarbonate (PC) or polymethyl methacrylate (Polymethylmetahcrolate, PMMA) and the like is made of any one material. The lens 100 may be manufactured using a method such as injection molding, shaving, polishing, etc., but the processing method is not limited to the above method.
In addition, the refractive index of the lens 100 is preferably configured using a range of about 1.4 to 2.0.
Hereinafter, the propagation path characteristics of the light for the lens 100 on the LED 130 will be described.
Since the lens 100 has a concave lens shape 110 near the center axis, the light emitted through the center axis image θ 0 = 0 among the lights 131 to 134 emitted from the LED 130 ( 131 exits the lens 100 without refracting (131a).
Then, the light 132 and 133 emitted in the directions θ 1 and θ 2 near the central axis pass through the lens 100, but are larger than the original direction angles θ 1 and θ 2 , respectively. Exit (132a, 133a). The reason is that the inner surface of the lens 100 is composed of a spherical or ellipsoidal curved surface, and the outer surface of the lens 100 has a concave lens shape 110, so that light entering this region is far from the central axis of the lens 100. It will be bent in the direction.
In addition, the light 134 emitted in a direction θ 3 distant from the central axis passes through the lens 100 and exits the lens 100 in a state smaller than the original direction angle θ 3 (134a).
Here, the dotted arrows 131, 132, 133, and 134 all indicate directions in which light emitted from the LED 30 travels in the absence of a lens.
FIG. 5 is a view illustrating a hot spot formed in illuminance or luminance by an angled edge in the lens of FIG. 4.
Referring to FIG. 5, there is one angled portion 113 in the central axis 35 portion of the lens 100, which causes a hot spot of illuminance or luminance on the optical panel 34 on the lens 100. (hot spot) will occur. That is, a hot spot 36 is generated on the LED axis 130 and the central axis 35 of the lens 100, which is an area whose illumination or brightness is different from that of the peripheral area 37 of the optical panel 34. Done. In order to correct such a hot spot, it is necessary to insert an additional optical pattern in the angled portion 113 of the lens 100.
FIG. 6 is a view illustrating a structure in which fine diffuser fine beads are distributed in a point light source diffuser lens for a backlight according to an embodiment of the present invention.
As shown, the backlight point light source diffusion lens 200 according to an embodiment of the present invention is configured by dispersing the diffuse micro beads 250 therein.
The diameter of the fine beads 250 is preferably configured using a 1μm to about 1mm.
In addition, the refractive index of the microbeads 250 is preferably used that is about 1.4 to 2.0, if the material is transparent to light does not matter as the material of the beads 250, more preferably It is preferable to comprise using either glass, silicone, or resin, such as PC or PMMA.
In addition, the refractive index of the microbeads 250 is preferably to have a difference of about 0.01 to 0.2 from the refractive index of the lens 200. For example, when the refractive index of the material of the lens 200 is 1.48, the refractive index of the material of the beads 250 is 1.55.
In this case, when the refractive index of the microbeads 250 is made larger, the light is totally reflected or refracted or scattered, and when the refractive index of the lens 200 is made larger, the light is refracted by the microbeads 250 to proceed. . Accordingly, it should be understood that the above examples are not limited.
As illustrated in FIG. 6, the light emitted from the LED 230 is basically refracted by the lens 200 and the microbeads 250 are formed as shown in FIG. 6. By the refraction or scattering by the advancing 231a, 232a, 233a, 234a, the light (231, 232, 233, 234) emitted from the LED 230 when there is only the lens 100 as shown in FIG. The light 231a, 232a, 233a, and 234a changes direction more than when proceeding.
In other words, when the lens 200 of FIG. 6 is used on the LED 230, light emitted from the LED 230 is further refracted or scattered by the microbeads 250 while traveling inside the lens 200. Hot spots 36 such as do not occur.
In addition, a portion of the light emitted from the LED 230 may be bent downward instead of upward due to reflection, refraction, scattering, etc. in the lens 200. In order to configure the LED 230 is further provided with a reflective film (not shown) on the substrate arranged.
FIG. 7 is a view illustrating a structure in which fine diffuser beads are distributed in a portion of a point light source diffusion lens for backlight according to an embodiment of the present invention.
As shown, the backlight point light source diffuser lens 300 according to an embodiment of the present invention is configured by distributing the diffuse microbeads 350 to be limited to only a part of the inside. That is, by distributing the fine beads 350 only in the portion of the lens 300 that causes hot spots of illuminance or luminance, the same effects as in the case of FIG. 6 may be obtained.
In addition, the diameter, refractive index, material, and the like of the fine beads 350 are the same as in FIG. 6, and will be omitted below.
In addition, a portion of the light emitted from the LED 330 may be bent downward instead of upward due to reflection, refraction, scattering, or the like in the lens 300. In order to configure the LED 330 is further provided with a reflective film (not shown) on the substrate arranged.
In the present invention, the BLU LED lens has been described in detail, but it is applied to a lens used for an advertisement board, a signal board, or a lighting plate as well as general lighting equipment such as a home lamp, a car lamp, or a portable lamp. Luminance can be obtained. That is, the lens of the present invention may be applied to a point light source so that light concentrated in the central axis may be dispersed farther from the central axis so that the illuminance or luminance may be more constant at a predetermined distance.
The present invention described above is limited to the above-described embodiments and the accompanying drawings as various substitutional modifications and changes are possible within a range without departing from the technical spirit of the present invention for those skilled in the art. It doesn't happen.
Claims (12)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020070091785A KR20090026671A (en) | 2007-09-10 | 2007-09-10 | Lens diffusing point source of light for backlight unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020070091785A KR20090026671A (en) | 2007-09-10 | 2007-09-10 | Lens diffusing point source of light for backlight unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR20090026671A true KR20090026671A (en) | 2009-03-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020070091785A KR20090026671A (en) | 2007-09-10 | 2007-09-10 | Lens diffusing point source of light for backlight unit |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR20090026671A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130061796A (en) * | 2011-12-02 | 2013-06-12 | 엘지전자 주식회사 | Optical assembly, backlight unit having the same, and display apparatus thereof |
| US8530918B2 (en) | 2009-11-17 | 2013-09-10 | Lg Innotek Co., Ltd. | Light emitting device package and lighting system |
| US8662713B2 (en) | 2010-04-09 | 2014-03-04 | Lg Innotek Co., Ltd | Lens and lighting device including the same |
| CN105003886A (en) * | 2014-04-17 | 2015-10-28 | 鸿富锦精密工业（深圳）有限公司 | Diffusion lens of point light source |
| KR20170029777A (en) * | 2015-09-08 | 2017-03-16 | 엘지이노텍 주식회사 | Lens and light emitting unit including the same |
| CN109557714A (en) * | 2017-09-27 | 2019-04-02 | 群创光电股份有限公司 | Light supply apparatus and display device |
-
2007
- 2007-09-10 KR KR1020070091785A patent/KR20090026671A/en active Search and Examination
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8530918B2 (en) | 2009-11-17 | 2013-09-10 | Lg Innotek Co., Ltd. | Light emitting device package and lighting system |
| US8835969B2 (en) | 2009-11-17 | 2014-09-16 | Lg Innotek Co., Ltd. | Light emitting device package and lighting system |
| US8662713B2 (en) | 2010-04-09 | 2014-03-04 | Lg Innotek Co., Ltd | Lens and lighting device including the same |
| KR20130061796A (en) * | 2011-12-02 | 2013-06-12 | 엘지전자 주식회사 | Optical assembly, backlight unit having the same, and display apparatus thereof |
| CN105003886A (en) * | 2014-04-17 | 2015-10-28 | 鸿富锦精密工业（深圳）有限公司 | Diffusion lens of point light source |
| KR20170029777A (en) * | 2015-09-08 | 2017-03-16 | 엘지이노텍 주식회사 | Lens and light emitting unit including the same |
| CN109557714A (en) * | 2017-09-27 | 2019-04-02 | 群创光电股份有限公司 | Light supply apparatus and display device |
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