WO2007029961A1 - Light emitting unit and direct light type back light apparatus using the same - Google Patents
Light emitting unit and direct light type back light apparatus using the same Download PDFInfo
- Publication number
- WO2007029961A1 WO2007029961A1 PCT/KR2006/003527 KR2006003527W WO2007029961A1 WO 2007029961 A1 WO2007029961 A1 WO 2007029961A1 KR 2006003527 W KR2006003527 W KR 2006003527W WO 2007029961 A1 WO2007029961 A1 WO 2007029961A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- light emitting
- lens
- emitting unit
- incident
- Prior art date
Links
- 238000009792 diffusion process Methods 0.000 claims abstract description 12
- 229920002050 silicone resin Polymers 0.000 claims description 16
- 229920000647 polyepoxide Polymers 0.000 claims description 11
- 239000003822 epoxy resin Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 239000000853 adhesive Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 239000012780 transparent material Substances 0.000 claims description 4
- 239000004593 Epoxy Substances 0.000 claims description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 3
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 3
- 239000004925 Acrylic resin Substances 0.000 claims description 2
- 229920000178 Acrylic resin Polymers 0.000 claims description 2
- 229920000515 polycarbonate Polymers 0.000 claims description 2
- 239000004417 polycarbonate Substances 0.000 claims description 2
- 238000009826 distribution Methods 0.000 description 21
- 238000005286 illumination Methods 0.000 description 7
- 238000004383 yellowing Methods 0.000 description 7
- 230000004907 flux Effects 0.000 description 6
- 239000004973 liquid crystal related substance Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 4
- 238000004020 luminiscence type Methods 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- NCGICGYLBXGBGN-UHFFFAOYSA-N 3-morpholin-4-yl-1-oxa-3-azonia-2-azanidacyclopent-3-en-5-imine;hydrochloride Chemical compound Cl.[N-]1OC(=N)C=[N+]1N1CCOCC1 NCGICGYLBXGBGN-UHFFFAOYSA-N 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007516 diamond turning Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000001721 transfer moulding Methods 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
- G02B19/0071—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source adapted to illuminate a complete hemisphere or a plane extending 360 degrees around the source
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0028—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed refractive and reflective surfaces, e.g. non-imaging catadioptric systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
- G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/04—Simple or compound lenses with non-spherical faces with continuous faces that are rotationally symmetrical but deviate from a true sphere, e.g. so called "aspheric" lenses
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/58—Optical field-shaping elements
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/58—Optical field-shaping elements
- H01L33/60—Reflective elements
Definitions
- the present invention relates to a light emitting unit using a light emitting diode and a backlight apparatus employing the light emitting unit, and more particularly, to a light emitting unit having improved brightness, wherein formation of dark portions in and around the center of a lens can be prevented, and a direct light type backlight apparatus employing the light emitting unit.
- the LGP 3 and the optical prism sheet 7 are used to convert the light transmitted through the edges of LGP 3 to be transmitted in a perpendicular direction and to correct the path of the illumination light, the number of components is great and space for the components is needed, which creates a limitation in reducing the total thickness of the backlight apparatus.
- the color gamut of the conventional backlight apparatus is very low, about 74 % of the National Television System Committee (NTSC) standard.
- LED light emitting units using light emitting diodes
- the LEDs are point light sources unlike the CCFLs which are line light sources.
- the LEDs have longer lifetime, are environmentally-friendly, have high color gamut, and the range of operation of the LED is wider. Moreover, the LEDs can illuminate highly bright light.
- the present invention provides a light emitting unit with increased brightness and a structure in which formation of dark portions in the center of the upper portion of the light emitting unit are prevented.
- the present invention also provides a direct light type backlight apparatus employing the light emitting unit without a light guide panel (LGP), to be made thin and have uniform illumination over a large surface.
- LGP light guide panel
- a light emitting unit comprising: a base; a light emitting diode that is mounted on the base and emits light; a cup member formed around the light emitting diode on the base to a predetermined height; and a lens installed on the base and including an incident portion that is disposed toward the light emitting diode and onto which light is incident, a first refraction portion that is formed flat in the center of a surface of the lens opposite the incident portion and refracts and transmits incident light, and a second refraction portion that is formed from the first refraction portion to have a predetermined curvature and refracts and transmits incident light, wherein light emitted by the light emitting diode is illuminated uniformly over a wide range of angles through the lens.
- a direct light type backlight apparatus comprising: a reflection panel reflecting incident light; a light source including a plurality of light emitting units each according to one of claims 1 through 7 and emitting light; a diffusion plate that is disposed on the light source and diffuses the light irradiated from the light emitting units; and a prism sheet converting the path of the light diffused by the diffusion plate by refracting and transmitting the light.
- the backlight apparatus according to the present invention includes a plurality of light emitting units having the above-described structure to illuminate light under the LCD panel. Accordingly, the backlight apparatus according to the present invention can be applied to a large-sized display device according to the arrangement and number of the light emitting units. Moreover, since light having desired uniform brightness can be obtained without using a light guiding panel, the backlight apparatus can be made light and thin, and the manufacturing costs and production time of the backlight apparatus can be reduced.
- FIG. 1 is a cross-sectional view of a conventional edge emitting type light emitting backlight apparatus
- FIG. 2 is a cross-sectional view illustrating a light emitting unit according to an embodiment of the present invention
- FIG. 4 illustrates paths of light L1 and L2 emitted from a light emitting diode when the refractive index of a dispensing member is greater than the refractive index of a lens;
- FIG. 12 illustrates a light emitting unit in which the diameter W of a first refraction portion is one third of the diameter R of the lens or smaller, and FIGS. 13 and 14 illustrate brightness distribution of the light transmitting the lens in FIG. 12;
- FIG. 15 illustrates an air layer formed between the lens and the dispensing member;
- FIG. 20 is a cross-sectional view illustrating the a light emitting unit according to another embodiment of the present invention.
- FIGS. 21 and 22 illustrate a angle distribution and uniformity of emitted light when a surface of the lens is polished
- FIGS. 23 and 24 illustrate an angle distribution and uniformity of emitted light when the surface of the lens is Matte-treated
- FIG. 27 is a graph showing luminescence of the polished lens and of the Matte-treated lens according to an embodiment of the present invention.
- FIG. 28 is a schematic view of a cross-sectional curve for explaining the surface roughness.
- FIG. 2 is a cross-sectional view illustrating a light emitting unit according to an embodiment of the present invention.
- the light emitting unit includes a base 31 , a light emitting diode 40 mounted on the base 31 , a cup member 33 formed around the light emitting diode 40 on the base 31 , and a lens 50 that is installed on the base 31 and changes the direction of light emitted from the light emitting diode 40.
- the light emitting diode 40 is a point light source and radiates light having a predetermined wavelength from a surface facing the lens 50.
- a lead frame 35 is formed in the base 31 to supply power to the light emitting diode 40, and the light emitting diode 40 is mounted on the lead frame 35 or is electrically connected to the lead frame 35 by wires.
- the cup member 33 is formed around the light emitting diode 40 on the base to a predetermined height.
- the cup member 33 is formed to surround the light emitting diode 40 with a dispensing member 61 which will be described later, and for installing the lens 50.
- the height of the cup member 33 should be such that the light path passing through the lens 50 is not interrupted.
- the height of the cup member 33 is set as high as the light emitting diode 40 or is slightly higher than the light emitting diode 40.
- the lens 50 has a structure to refract the emitted light in a perpendicular direction to the upper surface of the base 31 or in a direction almost perpendicular of the light from the light emitting diode 40 to the side.
- an incident portion 52 may be formed of a protruding surface protruding towards the light emitting diode 40 with a predetermined curvature.
- the incident portion 52 has a predetermined curvature, thereby functioning as a directional controlling element for light transmitted through the lens 50 together with the first and second refraction portion 53 and 55. Accordingly, the direction of light can be efficiently controlled when a lens is included.
- a dispensing member 61 may be further included inside the cup member 33.
- the dispensing member 61 is a transparent member and is interposed between the light emitting diode 40 and the lens 50 to protect the light emitting diode 40.
- the dispensing member 61 blocks heat, which is generated during emission of light from the light emitting diode 40, from being directly transferred to the lens 50, thereby preventing yellowing of the lens 50.
- FIG. 4 illustrates paths of light L1 and L2 emitted from the light emitting diode 40 when the refractive index of a dispensing member 61' is greater than the refractive index of the lens 50. Referring to FIG.
- L3 proceeds in a more upward direction of the lens 50 than L4.
- the difference between the refractive indices of the lens 50 and the dispensing member 61" is small or zero, light proceeds at a greater refraction angle, and thus can be spread to a wider region entirely.
- the higher the refractive index of the lens 50 the greater the final refraction angle of light emitted from the lens 50. Therefore, the lens 50 and the dispensing member 61 " may have the same refractive index, which is preferably large.
- the lens 50 may be formed of a material satisfying Inequality 1: [Inequality 1 ] 1.4 ⁇ n ⁇ ⁇ 1.65
- Examples of a transparent material forming the lens 50 may be epoxy resin, polymethylmethacrylate (PMMA), polycarbonate (PC), acrylic resin, silicone resin, etc. having a d-line refractive index nd1 of 1.54.
- the dispensing member 61 is formed of a material satisfying Inequality 2: [Inequality 2]
- An example of the material forming the dispensing member 61 is silicone resin having a d-line refractive index nd2 of 1.41.
- the first refraction portion 53 has a structure that is formed flat in the center of the surface opposite to the incident portion 51.
- the refraction angle at which light is transmitted through the lens 50 increases and thus dark portions in a position where brightness is measured can be removed.
- the lens having a first refraction portion 53 with a flat structure and the lens according to Comparative Example as illustrated in FIGS. 6 and 7 are compared to describe the advantage of the first refraction portion 53 having a flat structure.
- FIGS. 6 and 7 illustrate a light emitting unit and a backlight apparatus disclosed in Korean Patent Application No.
- the lens 20 includes a first refraction portion 21 that is engraved in a cone form in the upper center of the lens 20 and a second refraction portion 23 formed from the first refraction portion 21 with a predetermined curvature.
- the distributions A and B of light transmitted through respectively the first refraction portion 21 and the second refraction portion 23 are observed when the lens 20 is formed as described above.
- the distribution B of the light transmitted through the second refraction portion 23 is uniform with relatively small interval difference.
- the distribution A of the light transmitted through the first refraction portion 21 increases from the center of the first refraction portion 21 to the second refraction portion 23, and thus, the intensity of light increases towards the center of the first refraction portion 21.
- the refraction angle rapidly increases according to the distance variation of the incident angle.
- the first refraction portion 53 is formed of a flat structure in order to remove the dark portions.
- the incident angle in the center increases proportionally on the whole, and thus dark portions generated at the portion where brightness is measured (or at the position of the LCD when the light emitting unit is employed as a light source of the backlight apparatus) can be removed.
- the diameter w of the first refraction portion 53 may satisfy Inequality 3 below with respect to the total diameter R of the lens 50. [Inequality 3]
- FIG. 8 illustrates a light emitting unit in which the diameter W of a first refraction portion is one third of the diameter R of the lens or greater
- FIGS. 9, 10, and 11 illustrate the brightness distribution of the light transmitting the lens of FIG. 8.
- the brightness distribution C of the light transmitted through the first refraction portion 53 is of higher intensity than the brightness distribution of the light transmitted through the surrounding portions. This is because the refraction angle is low since the first refraction portion 53 is formed of a flat structure, and the number of light beams proceeding in a straight line through the center is increased. Having such a structure, the brightness distribution of light transmitted through the lens 50 is not uniform, and thus the light emitting unit according to the current embodiment of the present invention cannot be used as a light source for a light emitting unit.
- FIG. 12 illustrates a light emitting unit in which the diameter w of a first refraction portion is one third of the diameter R of the lens or smaller
- FIGS. 13 and 14 illustrate brightness distribution of the light transmitting the lens of FIG. 12.
- the second refraction portion 55 has predetermined curvature to refract and transmit light that is emitted by the light emitting diode 40 to a side.
- the second refraction portion 55 may be a spherical surface having a radius of curvature of 2 to 10 mm.
- the radius of curvature is greater than 10 mm, the refraction angle of the light emitted by the light emitting diode 40 and incident on the second refraction portion 55 becomes smaller. Accordingly, the illumination surface of light is reduced.
- the curvature radius of the second refraction portion 55 is 2 mm or smaller, sufficient size of the second refraction portion 55 cannot be secured, and the first refraction portion 53 cannot be arranged properly.
- the lens 50 can be formed using projection molding, injection molding, transfer molding, diamond turning processing, etc.
- the lens 50 can be installed on the base 31 using an adhesive agent 63.
- the adhesive agent 63 may be epoxy resin or silicone resin which is identical to the medium of the lens 50. As illustrated in FIG. 2, when the lens 50 is bonded to the base 31 , the interface between the lens 50 and the dispensing member 61 may be separated and an air layer may be formed therebetween, as illustrated in FIG. 15.
- the light emitting unit may have a bonding structure as illustrated in FIG. 16.
- the lens 50 is installed on the base 31 , wherein a portion of the lens 50 is bonded to the cup member 35.
- the first bonding portion formed in the lens 50 and the second bonding portion 35a formed in the cup member 35 are formed as uneven shapes corresponding to each other such that the surface area of the first and second bonding portions 57 and 35a facing each other is large, and bonded to each other using an adhesive agent 65.
- the adhesive agent 65 may be formed of epoxy which is identical to the material of the lens 50.
- the bonding structure is improved as described above, even when the lens 50 and the dispensing member 61 are not bonded to each other due to the characteristic of the material, the lens 50 is strongly bonded to the cup member 35, and thus the thermal expansion of the dispensing member 61 , which is generated during the operation of the light emitting unit 40, can be suppressed. Accordingly, air from the outside does not flow into the cup members 35 during the on/off operation of the light emitting unit 40, thereby fundamentally blocking formation of an air layer.
- FIG. 17 is a cross-sectional view illustrating a light emitting unit according to another embodiment of the present invention.
- the light emitting unit includes a base 31 , a light emitting diode 40 mounted on the base 31 , a cup member 35 formed around the light emitting diode 40 on the base 31 , a lens 150 that is installed on the base 31 and changes the direction of light emitted by the light emitting diode 40, and a dispensing member 161.
- the lens 150 includes a first refraction portion 153 having a flat structure and a second refraction portion 155 having a predetermined curvature.
- the lens 150 has the substantially same structure as the lens 50, thus detailed description of the lens 150 will be omitted.
- the lens 150 and the dispensing member 161 are formed of silicone resin and as a single unit using a direct molding process.
- the number of assembly processes can be reduced.
- the lens 150 and the dispensing member 161 formed as a single unit are formed of silicone resin, yellowing can be prevented, which occurs when the lens 150 and the dispensing member 161 are formed of epoxy resin, and decrease in luminous flux due to the yellowing can be prevented.
- FIG. 20 is a cross-sectional view of a light emitting unit according to another embodiment of the present invention.
- the light emitting unit includes a base 31 , a light emitting diode 40 mounted on the base 31 , a cup member 35 formed around the light emitting diode 40 on the base 31 , a lens 250 that is installed on the base 31 and changes the direction of light emitted by the light emitting diode 40, and a dispensing member 61.
- the lens 250 includes a first refraction portion 253 having a flat structure and a second refraction portion 255 having a predetermined curvature, wherein a surface 250a of the lens 250 is Matte-treated.
- the lens 250 has the same structure as the lens 150 except that the surface 250a is Matte-treated, thus detailed description of the lens 250 will be omitted.
- the surface of a lens of a conventional light emitting unit is polished, concerning the brightness.
- the lens 250 is polished, as illustrated in FIG. 21 , the light intensity does not vary smoothly with angle, and thus bright lines in a ring form are generated as illustrated in FIG. 22, thereby causing a decrease in uniformity of brightness of illumination light.
- the surface 250a of the lens 250 is Matte-treated, light transmitting the lens 250 is scattered at the first and second refraction portions 253 and 255, and light having uniform light distribution without bright lines in a ring form can be obtained, as illustrated in FIGS. 23 and 24.
- FIG. 25 shows a angle distribution of light emitted by a conventional light emitting unit, which has a maximum light intensity at 0 degrees.
- a considerable amount of scattered light beams show up as a dotted line in FIG. 25.
- the light intensity of the dotted line is 0.5 times or less of the maximum light intensity, and the light beams in the area of the dotted line do not illuminate but disappear when the light emitting unit is driven.
- the Matte-treatment of the surface 250a of the lens refers to processing the surface of the lens to have a predetermined roughness.
- the surface roughness refers to the degree of unevenness of the surface indicating the precision of the surface.
- FIG. 28 is a schematic view of a cross-sectional curve for explaining the surface roughness.
- the cross-sectional curve refers to the shape of a cross-section of the processed surface cut perpendicularly.
- Rmax refers to maximum roughness
- Ra refers to the average of the center line, that is, roughness.
- Rmax refers to the distance between two parallel lines which are parallel to the center line of the cross-sectional curve and contact respectively the highest point of the plot and the lowest point of the plot when picking a reference line from the plot.
- Ra according to the current embodiment of the present invention may be in the range of 0.8 ⁇ m through 1.8 ⁇ m.
- Ra When Ra is less than 0.8 ⁇ m, the lens surface becomes as if polished, and thus bright lines in a ring form are formed.
- Ra When Ra is greater than 1.8 ⁇ m, light is scattered excessively, thus the luminous flux is decreased.
- FIG. 29 is a cross-sectional view of an edge emitting type light emitting backlight apparatus according to an embodiment of the present invention.
- the edge emitting type light emitting backlight apparatus includes a reflection panel 71 , light source 100 that is formed on the reflection panel 71 and irradiates light, a diffusion plate 73 disposed on the light source 100, and a prism sheet 75 refracting and transmitting emitted light in the direction of an LCD panel 77.
- the reflection panel 71 reflects light emitted from the light source 100 to the diffusion plate 73.
- the light source 100 includes a plurality of light emitting units which have been described with reference to FIGS. 2 through 28, each light emitting unit emits light having a maximum light intensity at +/- 75 degrees.
- the light emitting unit has the configuration as described above, thus detailed description thereof will not be repeated.
- the diffusion plate 73 diffuses and transmits the light emitted by the light source 100.
- the prism sheet 75 refracts the light refracted and transmitted by the diffusion plate 73 to guide the light to the LCD panel 77.
- the backlight apparatus as described above can emit light having predetermined brightness to the LCD panel 70 without a light guide panel (LGP) (reference numeral 3 of FIG. 1 ) using a direct light type light emitting light source.
- LGP light guide panel
- the light emitting unit according to the present invention includes an improved bonding structure of a lens and a base to prevent formation of an air layer between the lens and the dispensing member, thereby fundamentally preventing decrease in light uniformity due to the air layer.
- the light emitting unit according to the present invention includes a lens having a Matte-treated surface to scatter emission light on the surface of the lens, thereby reducing bright lines which are caused when the surface of the lens is polished.
- the backlight apparatus according to the present invention includes a plurality of light emitting units having the above-described structure to illuminate light onto a lower surface of the LCD panel. Accordingly, the backlight apparatus according to the present invention can be applied to a large-sized display device according to the arrangement and number of the light emitting units. Moreover, since light having desired uniform brightness can be obtained without using a light guiding panel, the backlight apparatus can be made light and thin, and the manufacturing costs and production time of the backlight apparatus can be reduced.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Nonlinear Science (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Planar Illumination Modules (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2005-0082453 | 2005-09-05 | ||
KR1020050082453A KR100738251B1 (ko) | 2005-09-05 | 2005-09-05 | 발광 유니트 및 이를 채용한 직하 발광형 백라이트 장치 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007029961A1 true WO2007029961A1 (en) | 2007-03-15 |
Family
ID=37836041
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2006/003527 WO2007029961A1 (en) | 2005-09-05 | 2006-09-05 | Light emitting unit and direct light type back light apparatus using the same |
Country Status (2)
Country | Link |
---|---|
KR (1) | KR100738251B1 (ko) |
WO (1) | WO2007029961A1 (ko) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009016582A2 (en) * | 2007-07-30 | 2009-02-05 | Koninklijke Philips Electronics N.V. | Concave wide emitting lens for led useful for backlighting |
CN101994988A (zh) * | 2009-08-24 | 2011-03-30 | 恩普乐股份有限公司 | 光束控制部件、发光装置、面光源装置以及显示装置 |
WO2011117303A1 (de) * | 2010-03-25 | 2011-09-29 | Osram Opto Semiconductors Gmbh | Licht emittierendes halbleiterbauteil und sender-empfängervorrichtung |
JP2015228384A (ja) * | 2007-04-05 | 2015-12-17 | コーニンクレッカ フィリップス エヌ ヴェKoninklijke Philips N.V. | 光ビーム整形器及び照明装置 |
CN111897163A (zh) * | 2020-08-20 | 2020-11-06 | 安徽芯瑞达科技股份有限公司 | 一种led搭配透镜实现超低od的背光模组装置 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100967208B1 (ko) * | 2008-04-23 | 2010-07-05 | 서명덕 | 조명기구용 볼록렌즈 |
KR101646808B1 (ko) * | 2009-10-28 | 2016-08-08 | 가부시키가이샤 제이올레드 | 렌즈 시트, 표시 패널 장치 및 표시 장치 |
KR101413596B1 (ko) * | 2012-12-07 | 2014-07-02 | 주식회사 루멘스 | 발광장치 및 이를 구비하는 백라이트 유닛 |
KR102044518B1 (ko) * | 2017-06-13 | 2019-11-13 | 주식회사 아모센스 | 센서 패키지용 윈도우 커버 및 이를 구비한 센서 패키지 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6547423B2 (en) * | 2000-12-22 | 2003-04-15 | Koninklijke Phillips Electronics N.V. | LED collimation optics with improved performance and reduced size |
JP2005136101A (ja) * | 2003-10-29 | 2005-05-26 | Stanley Electric Co Ltd | 半導体発光装置 |
US20050179041A1 (en) * | 2004-02-18 | 2005-08-18 | Lumileds Lighting U.S., Llc | Illumination system with LEDs |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100426050C (zh) * | 1999-07-26 | 2008-10-15 | 拉博斯费尔株式会社 | 体积型透镜、发光体、照明器具及光信息*** |
JP3778186B2 (ja) * | 2003-02-18 | 2006-05-24 | 株式会社豊田自動織機 | 導光板 |
-
2005
- 2005-09-05 KR KR1020050082453A patent/KR100738251B1/ko active IP Right Grant
-
2006
- 2006-09-05 WO PCT/KR2006/003527 patent/WO2007029961A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6547423B2 (en) * | 2000-12-22 | 2003-04-15 | Koninklijke Phillips Electronics N.V. | LED collimation optics with improved performance and reduced size |
JP2005136101A (ja) * | 2003-10-29 | 2005-05-26 | Stanley Electric Co Ltd | 半導体発光装置 |
US20050179041A1 (en) * | 2004-02-18 | 2005-08-18 | Lumileds Lighting U.S., Llc | Illumination system with LEDs |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015228384A (ja) * | 2007-04-05 | 2015-12-17 | コーニンクレッカ フィリップス エヌ ヴェKoninklijke Philips N.V. | 光ビーム整形器及び照明装置 |
WO2009016582A2 (en) * | 2007-07-30 | 2009-02-05 | Koninklijke Philips Electronics N.V. | Concave wide emitting lens for led useful for backlighting |
WO2009016582A3 (en) * | 2007-07-30 | 2009-03-26 | Philips Lumileds Lighting Co | Concave wide emitting lens for led useful for backlighting |
CN101994988A (zh) * | 2009-08-24 | 2011-03-30 | 恩普乐股份有限公司 | 光束控制部件、发光装置、面光源装置以及显示装置 |
WO2011117303A1 (de) * | 2010-03-25 | 2011-09-29 | Osram Opto Semiconductors Gmbh | Licht emittierendes halbleiterbauteil und sender-empfängervorrichtung |
CN111897163A (zh) * | 2020-08-20 | 2020-11-06 | 安徽芯瑞达科技股份有限公司 | 一种led搭配透镜实现超低od的背光模组装置 |
Also Published As
Publication number | Publication date |
---|---|
KR20070025861A (ko) | 2007-03-08 |
KR100738251B1 (ko) | 2007-07-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN110959129B (zh) | 照明设备 | |
TWI422861B (zh) | 光控制鏡片及其光源裝置 | |
RU2512110C2 (ru) | Светодиод с прессованной двунаправленной оптикой | |
US7341358B2 (en) | Illumination apparatus | |
KR100499133B1 (ko) | 백라이트 유닛 | |
US8348491B2 (en) | Light guide plates and backlight module | |
US7703973B2 (en) | Backlight module | |
JP5325639B2 (ja) | 発光装置 | |
WO2007029961A1 (en) | Light emitting unit and direct light type back light apparatus using the same | |
US20080055931A1 (en) | Method and Systems for Illuminating | |
US20090067176A1 (en) | Backlight module and light guide plate thereof | |
KR20070028006A (ko) | 백라이트용 led 렌즈 | |
TWI460503B (zh) | 背光單元 | |
JP2011014831A (ja) | 発光装置、面光源および液晶ディスプレイ装置 | |
JP2011009052A (ja) | 面光源および液晶ディスプレイ装置 | |
WO2009047891A9 (ja) | 面光源素子アレイおよび画像表示装置 | |
KR101408324B1 (ko) | 광 확산렌즈 | |
EP1478954B1 (en) | Compact lighting system and display device | |
US20060044832A1 (en) | Light guide plate and backlight module employing the same | |
KR20110101465A (ko) | 도광판 및 이를 구비한 백라이트 유닛 및 디스플레이 장치 | |
KR101349833B1 (ko) | Led 조명장치 | |
KR101850428B1 (ko) | 광원 모듈, 이를 포함하는 표시장치 | |
US20070102719A1 (en) | Light emitting diode | |
KR101239076B1 (ko) | 측면발광형 백라이트 유닛의 도광판을 채용한 액정표시소자 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 06798667 Country of ref document: EP Kind code of ref document: A1 |