Back light unit and liquid crystal display using the same
Provided is a back light unit comprising a plurality of LED light source formed on a printed circuit board and a resin layer which is laminated on the LED light source and forwardly induces diffusion of the emitted light wherein the resin layer is made of synthetic resin comprising an oligomer. According to the present invention, an essential light guide plate for a general back light unit configuration is removed and a resin layer mainly consisting of an oligomer is used to guide the light source, and thereby decreasing the number of the light source, minimizing luminance variation when the unit is lighted at a high temperature and kept it for a predetermined time period, and implementing excellent heat-resistant property and optical property.
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This application is the U.S. national stage application of International Patent Application No. PCT/KR2011/006213, filed Aug. 23, 2011, which claims priority to Korean Application No. 10-2010-0133431, filed Dec. 23, 2010, the disclosures of each of which are incorporated herein by reference in their entirety. The present application is a reissue application of U.S. patent application Ser. No. 13/997,112, filed Aug. 22, 2013, now U.S. Pat. No. 9,939,677, issued Apr. 10, 2018, which is the U.S. national stage application of International Patent Application No. PCT/KR2011/006213, filed Aug. 23, 2011, which claims priority to Korean Patent Application No. 10-2010-0133431, filed Dec. 23, 2010, the disclosure of each of which is hereby incorporated herein by reference in its entirety.
TECHNICAL FIELDThe present invention relates to a backlight unit and a liquid crystal display using the backlight unit in which a light guide plate is removed and thereby thinning the backlight unit and ensuring light efficiency.
BACKGROUND ARTIn general, a liquid crystal display (LCD) refers to as a display device in which by separately supplying data signals according to image information to pixels arranged in a matrix type and adjusting light transmission rates of the pixels, images can be adjusted to desired images wherein since it does not self-emit light, a back light unit is arranged on a rear surface thereof to display images.
Referring to
In the LED 10, light L entered to the light guide plate 30 is reflected upwardly from fine reflection patterns or a reflection sheet 40 provided at a bottom of the light guide plate 30 and is emitted from the light guide plate 30 to provide back light to a LCD panel 50 disposed on a upper part of the light guide plate 30. As shown in
The back light unit serves to evenly emit light for displaying image on a rear surface of LCD which does not spontaneously emit light. Further, the light guide plate is a kind of plastic formation lens and serves to uniformly transfer light emitted from a light source (LED) to the entire surface of LCD for providing even luminance and lighting to the back light unit. Accordingly, this light guide plate is basically used as an essential element for the back light unit; however, there is a limitation to thinning a thickness of the back light unit due to its own thickness of the light guide plate. Specially, in a case of the back light unit of a large area, an image quality is degraded.
DISCLOSURE OF INVENTION Technical ProblemThe present invention has been proposed to solve the above drawbacks and an object of the present invention relates to provide a back light unit in which an essential light guide plate for a general back light unit configuration is removed and a resin layer mainly consisting of an oligomer is used to guide the light source, and thereby decreasing the number of the light source, minimizing luminance variation when the unit is lighted at a high temperature, and implementing excellent heat-resistant property and optical property.
Further, another object of the present invention relates to provide a back light unit and a liquid crystal display using the back light unit in which a tensile strength, reliability of constant temperature and humidity, and heat-resistant reliability are ensured in the products and degree of freedom is increased in the back light unit by thinning entire thickness of a back light unit.
Solution to ProblemAccording to an embodiment of the present invention, provided is a back light unit comprising: a plurality of LED light sources formed on a printed circuit board; and a resin layer which is laminated on the printed circuit board and forwardly induces diffusion of the emitted light wherein the resin layer is formed with synthetic resin comprising oligomer.
The resin layer may include the oligomer, monomer and additives.
The oligomer may be urethane acrylate oligomer.
The monomer may include a mixture comprising IBOA (isobornyl Acrylate) of 10-21%, HBA (Hydroxybutyl Acrylate) of 10-21% and HEMA (Hydroxy Metaethyl Acrylate) of 10-21%.
The additives may be a mixture comprising the photo initiator of 1-5% and the anti-oxidant of 0.5-1% on the basis of the total weight of the resin layer.
In the back light unit according to the present invention, the LED light source is a side view light emitting diode (LED), and a reflection film which is laminated on an upper surface of the printed circuit board and on which reflection patterns are formed.
In the back light unit according to the present invention, a diffusion plate which is formed on an upper surface of the resin layer and on which an optical pattern for shielding or reflecting light are printed may be further provided.
Specially, the resin layer may comprise beads of 0.01-0.3 wt % on the basis of the total weight of the resin layer for increasing light reflection.
In addition, the optical pattern is formed as an overlapped configuration of a diffusion pattern formed using a light shielding ink comprising one or more selected from a group consisting of TiO2, CaCO3, BaSO4, Al2O3 and Silicon, and a light shielding pattern formed using a light shielding ink comprising Al or a mixture of Al and TiO2.
The reflection patterns may be formed using a reflection ink comprising one of TiO2 and Al2O3.
A liquid crystal display may be implemented using the back light unit according to the present invention. Specially, a side view LED is used as a light source and the resin layer of the present invention laminated for receiving the light source is used as a light guide plate wherein the liquid crystal display is provided with a back light unit comprising: a reflection film laminated on a upper surface of the printed circuit board, on which reflection patterns are formed; and a diffusion plate formed on a upper surface of the resin layer on which optical patters for shielding or reflecting emitted light are printed. Here, the back light unit further comprises prism sheets or protection sheets laminated on an upper part of the diffusion plate.
Advantageous Effects Of InventionAccording to the present invention, an essential light guide plate for a general back light unit configuration is removed and a resin layer mainly consisting of an oligomer is used to guide the light source, and thereby decreasing the number of the light source, minimizing luminance variation when the unit is lighted at a high temperature and kept it for a predetermined time period, and implementing excellent heat-resistant property and optical property.
The above and other aspects, features and advantages of certain exemplary embodiments of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:
110: printed circuit board
111: LED light source
120: reflection film
130: reflection pattern
140: resin layer
150: diffusion plate
151: optical pattern
151a: diffusion pattern
151b: light shielding pattern
160: prism sheet
BEST MODE FOR CARRYING OUT THE INVENTIONExemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Wherever possible, the same reference numerals will be used to refer to the same elements throughout the specification, and a duplicated description thereof will be omitted. It will be understood that although the terms “first”, “second”, etc. are used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element.
A gist of the present invention relates to provide a back light unit in which a light guide plate is removed from a prior back light unit and it is formed with a resin layer mainly consisting of an oligomer and thereby minimizing luminance variations at a high temperature and decreasing greatly a thickness of a whole back light unit and further the number of a light source.
Referring to
Further, in the back light unit according to the present invention, at least one or more of LED light sources 111 are arranged on the printed circuit board 110 to emit light. In this case, the LED may include a top view LED and a side view LED, and more preferably it may include the side view LED. That is, the light source using the side view LED may be used, through which the light emitted from the LED light source 111 is not emitted right upwardly and but emitted toward side thereof.
Here, the LED may be arranged in a direct-type, using the side view LED wherein the number of total light source can be decreased and total thickness of the back light unit can be decreased greatly by using the resin layer implementing light diffusion and reflection functions.
The resin layer 140 is laminated to bury the LED light source 111 and serves to diffuse light emitted sideward from the light source.
That is, a function of a prior light guide plate is performed through the resin layer 140. Here, it has to be understood that any resin material capable of diffusing light may be used for the resin layer.
According to an embodiment of the present invention, a resin mainly consisting of urethane acrylate oligomer (oligomer type) may be used for the resin layer. For example, urethane acrylate oligomer of synthetic oligomer may be used.
Of course, the resin material may further comprise a monomer mixed with IBOA (isobornyl acrylate), HBA (Hydroxybutyl Acrylate) and HEMA (Hydroxy Metaethyl Acrylate) of diluted-type reactive monomer of low boiling point and may comprise a photo initiator (for example, 1-hydroxycyclohexyl phenyl-ketone, Diphenyl), Diphenyl (2,4,6-trimethylbenzoyl phosphine oxide) or antioxidants as additives.
In more detail, the resin layer may be formed with a composition comprising oligomer, monomer and additives.
In this case, the monomer may be formed with a mixture of IBOA (isobornyl Acrylate) of 10-21%, HBA (Hydroxybutyl Acrylate) of 10-21% and HEMA (Hydroxy Metaethyl Acrylate) of 10-21%.
The additives may be formed by mixing the photo initiator of 1-5% to initiate a photo-reaction, or mixing the anti-oxidant of 0.5-1% to improve a yellowness phenomenon.
By forming a resin layer of UV resin using the composition as described above, instead of the light guide plate, the same effects as the light guide plate can be obtained and further a refraction rate and a thickness of the back light unit can be adjusted. At this time, all of an adhering property, reliability and mass production speed can be satisfied, using the composition as described above.
Specially, the resin layer according to the present invention may be preferably formed through the following processes.
That is, the resin layer according to the present invention may be mainly formed with urethane acrylate oligomer and be mainly-reacted in an UV curing wavelength of 300-350 μm or in a wavelength of 400 μm using mercury lamp or metal (gallium) lamp, and a second low pressure curing process is performed thereto wherein N2 is inputted during the second low pressure curing process to increase a surface-adhering force and a curing rate for adjusting a curing balance and thereby the resin layer is flexible and has excellent adhering force, and overcoming a limitation of the light guide plate by keeping a refraction rate of PMMA (polymethymethacrylate).
Specially, in a case wherein nitrogen purging is not performed when the oligomer is cured, surface wrinkles and cracks may be occurred due to unbalance of internal curing and surface curing and thus it preferably allows rapid curing to be performed through the nitrogen purging even in general metal halide.
In the following, as shown in
1. Adhering Force (Tensile Strength) Reliability Test
A tensile strength of a resin layer was tested using a thin film tensile strength tester (from Intron company of US) wherein the resin layer having a coating of an area of Width×length
of 50 mm×100 mm and a thickness of 1300 μm was formed on upper and lower grips of the tester, and when the upper grip rose, weight loaded on a load cell was measured in and compared in real time (see
Referring to the above test results, a tensile strength of the resin layer of the single oligomer type was lower than that of a resin layer of the polymer type, but optical characteristics such as luminance variation rate was good as will be described later.
2. Constant Temperature and Humidity Reliability Test
This test was performed using Temperature Humidity Bias (THB) and THB-SH-641 (from ESPEC company of JP) by applying a constant temperature and humidity to the resin layer and comparing constant temperature and humidity characteristics of the results therefrom. Here, test conditions were given as a temperature of 60° C. and humidity of 95% for 1000 hr and then characteristics was compared. Here, as shown in
Referring to table 2, there was no appearance abnormality and no variation of adhering extent in the oligomer type resin layer according to the present invention, however, yellowness phenomenon was occurred on the entire surface of the polymer type resin layer having a polymer only and further the adhering property was poor.
3. Heat-resistant Property Reliability Test
A heat-resistant property of the product was evaluated and compared by applying a predetermined amount of heat to the resin layer for a predetermined time period in an oven of HT330 (from ETAC company of JP). Here, the heat was applied at a temperature of 80° C. for 240 hr and then the heat-resistant property and adhering property were compared. Further, a coating having a thickness of 1300 μm and an area of width×length of 115 mm×175 mm is formed on the reflection film and then a test was performed under the conditions to the resin layer, and then appearance was observed and a lighting test was performed to compare the results (see
In the above test, there was no appearance abnormality and no variation of adhering extent in the oligomer type resin layer according to the present invention, however, yellowness phenomenon was occurred on the entire surface of the polymer type resin layer having an polymer only and further the adhering property was poor.
In comparisons of the above 3 characteristics tests, the resin layer having the composition mainly consisting of the oligomer according to the present invention has been confirmed to have better tensile strength, constant temperature and humidity property, heat-resistance, reliability, and adhering property than those of the single resin layer.
4. Luminance Variation Test Under a High Temperature Operation
Specially, it is shown experimental results from that a resin layer mainly consisting of the oligomer according to the present invention and the resin layer formed of the polymer were provided to the back light configuration according to the present invention as shown in
It is confirmed from these experimental results that it keeps an excellent heat-resistant property and an optical property after 1000 hr reliability test, comparing to the polymer type.
Referring to the configuration of the present invention as shown in
In the back light unit of the present invention, a resin layer 140 may further include beads 141 for increasing light diffusion and reflection. The beads 141 may be employed in an amount of 0.01-0.3 wt % on the basis of the total weight of the resin layer. That is, light emitted sideward from LED is diffused and reflected through the resin layer 140 and the beads 141 proceeds upwardly, and in a case of providing a reflection film 120 and a reflection pattern 121, this reflection function may be accelerated. Here, one selected from a group consisting of silicon, silica, glass bubble, PMMA, urethane, Zn, Zr, Al203 and acryl may be used for the beads wherein a material for the beads may be transparent.
An existing of the resin layer may reduce greatly a thickness of a prior light guide plate and thereby thinning the product and making it flexible and applicable to a display device of a wide use.
Further, the reflection film 120 may be Ag film or white PET and may be provided with a reflection material for diffusing light emitted from the light source, and reflection patterns 121 through a whiter printing for accelerating the light diffusion. The reflection patterns may be printed using a reflection ink comprising one selected from a group consisting of TiO2, CaCO3, BaSO4, Al2O3, Silicon and PS.
Furthermore, the diffusion plate 150 may serve to diffuse light emitted through the resin layer 140 may be provided with optical patterns for implementing light shielding effect to some extent to avoid optical property being worse due to excessively strong of light intensity, or deducting yellow light. That is, the light shielding patterns may be printed using a light shielding ink in order for light not to be concentrated. Here, the optical patterns 151 may be printed on a upper or lower surface of the diffusion plate 150, and more preferably, it may be arranged in a light emission direction (front direction) from the LED light source 111 placed on a lower part of the diffusion plate. That is, the optical patterns may be on a vertical upper surface of the LED light source or a location corresponding to a light emission directional surface.
Here, the optical patterns may serve to partly shied instead of entirely shield light diffuse light and may control light shielding extent or diffusing extent as one optical pattern. Furthermore, the optical patterns may be formed as overlapped printing configuration of complex patterns.
The overlapped printing configuration refers to a configuration in which one pattern is formed and another pattern is printed over the pattern.
As one example of the overlapped printing configuration, with respect to implementing the optical pattern 151, referring to
In addition, the light shielding pattern 151b of a metal layer may be formed as a middle layer among sequentially laminated configurations and then the diffusion pattern 151a may be formed on upper and lower surface of the light shielding pattern as a triple layer. In this triple configuration, the material as described in the forgoing may be used wherein as a preferable example, one of diffusion patterns may be formed using TiO2 having excellent refraction rate and the other diffusion pattern may be formed using CaCO3, having excellent light stability and color sense, together with TiO2 and the light shielding pattern may be formed therebetween using Al shaded excellently, and thereby ensuring light efficiency and uniformity through a triple configuration. Specially, CaCO3 is used for deducting an expose of yellow light and implementing white light and thereby implementing light of more stable efficiency and further in addition to CaCO3, BaSO4, Al2O3 and Silicon of inorganic material having a large particle size and similar configuration may be used.
Meanwhile, the optical pattern may be formed by adjusting pattern density in consideration of light efficiency in such manner that as it is far away from the light emission direction of the LED light source, a pattern density is lowed. Further, in the back light configuration as described in the forgoing according to the present invention, a surface treatment layer (not shown) enabling rough patterns of the optical patterns to be flat may be further provided between the resin layer 140 and the optical patterns 151 formed on the surface of the diffusion plate 150, and thereby excluding differences between a dark part and a light part which are caused from an air layer formed by a step difference occurred when the optical patterns 151 of the diffusion plate is adhered to the resin layer 140 placed on the lower part of the optical pattern wherein the surface treatment layer is formed to cover step difference of the entire optical pattern 151 as a flat layer. Additionally, the surface treatment layer may be same material as the resin layer 140 to improve an adhering property.
The reflection patterns may be formed in the light emission direction of the LED light source, as shown in an example of
As shown in
As described in the forgoing, in the back light unit according to the present invention, the light guide plate is removed and light is emitted from the side view LED as light supply source, and light is guided through diffusion and reflection using a resin layer, and thereby thinning the back light unit and decreasing number of light source. Further, luminance decreasing and light uniformity problems may be supplemented through the optical patterns such as the reflection pattern, the light shielding pattern and the diffusion pattern and thereby implementing uniform image.
INDUSTRIAL APPLICABILITYWhile the invention has been shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the scope of the invention is defined not by the detailed description of the invention but by the appended claims, and all differences within the scope will be construed as being included in the present invention.
Claims
1. A back light unit comprising:
- a printed circuit board;
- a plurality of LED light sources light emitting devices on a the printed circuit board;
- a resin layerwhich is laminated on the printed circuit board and buries burying the plurality of LED light sources, wherein the resin layer comprises 10-21% of an oligomer, 30-63% of a monomer, and 1.5-6% of additives light emitting devices;
- a diffusion plate disposed on an upper surface of the resin layer; and
- an optical pattern disposed between the diffusion plate and the resin layer,
- wherein the optical pattern comprises a light shielding pattern and a diffusion pattern on the light shielding pattern, the diffusion pattern comprising a material different from that of the light shielding pattern and having a pattern shape different from that of the light shielding pattern, such that the optical pattern controls the extent of light that is diffused and light that is shielded; first pattern and a second pattern,
- wherein the light shielding second pattern has a pattern shape having a recess and a protrusion in a light emission direction different from a pattern shape of the first pattern,
- wherein the diffusion pattern shields, reflects, and diffuses light;
- wherein the light shielding pattern shields and reflects light,
- wherein the diffusion pattern is in contact with a bottom surface of the diffusion plate,
- wherein the light shielding first pattern comprises: a first part being in direct physical contact with a part of the diffusion the second pattern and vertically overlapped with the part of the diffusion second pattern, and a second part not vertically overlapped with the LED light source second pattern; and
- wherein the diffusion pattern is not overlapped with the LED light source and comprises a first diffusion pattern entirely vertically overlapped with the light shielding pattern, and a second diffusion pattern partially vertically overlapped with the light shielding pattern
- wherein the first part is disposed in a light exit direction of the light emitting devices.
2. The back light unit of claim 1, wherein the oligomer is a urethane acrylate oligomer, and
- wherein the monomer is formed with a mixture comprising 10-21% of IBOA (isobornyl acrylate). 10-21% of HBA (hydroxybutyl acrylate) and 10-21% of HEMA (hydroxyethyl methacrylate).
3. The back light unit of claim 1, wherein the diffusion pattern further comprises a third diffusion pattern not vertically overlapped with the light shielding pattern.
4. The back light unit of claim 1, wherein the resin layer further comprises the additives containing a photo initiator of 1-5% and an anti-oxidant of 0.5-1% on the basis of the total weight of the resin layer.
5. The back light unit of claim 1, wherein the LED light sources comprise a side view light emitting diode (LED).
6. The back light unit of claim 1, which further comprises a reflection film laminated on an upper surface of the printed circuit board.
7. The back light unit of claim 6, wherein the reflection film further comprises a reflection pattern for reflecting light formed on a surface of the reflection film.
8. The back light unit of claim 7, wherein the reflection pattern is printed-patterned using a reflection ink comprising one selected from a group consisting of TiO2, CaCO3, BaSO4, Al2O3, Silicon and PS.
9. The back light unit of claim 1, wherein the diffusion pattern is formed using a light shielding ink comprising one or more selected from a group consisting of TiO2, CaCO3, BaSO4, Al2O3 and silicon, and the light shielding pattern is formed using a light shielding ink comprising Al or a mixture of Al and TiO2.
10. The back light unit of claim 1, wherein the resin layer further comprises beads of 0.01-0.3 wt % on the basis of the total weight of the resin layer for increasing light reflection.
11. The back light unit of claim 10, wherein the beads are one or more selected from a group of silicon, silica, glass bubble, PMMA, urethane, Zn, Zr, Al2O3, and acryl.
12. A liquid crystal display provided with a back light, using a side view light emitting diode (LED) as a light source and a resin layer as a light guide plate, which is laminated on a printed circuit board in a structure of burying a light source, and light unit comprising:
- a printed circuit board;
- a reflection film having a reflection pattern laminated disposed on an upper surface of the printed circuit board, and
- a diffusion plate that is formed on an upper surface of the resin layer and printed with an optical pattern that partially shields, partially reflects, and partially diffuses an emitted light;
- a plurality of light emitting devices disposed on the printed circuit board;
- a resin layer disposed on the reflection film and the plurality of light emitting devices; and
- an optical pattern disposed on the resin layer,
- wherein the optical pattern is disposed between the diffusion plate and the resin layer, and comprises a light shielding includes a first pattern and a diffusion second pattern on the light shielding pattern, the diffusion pattern comprising a material different from that of the light shielding pattern and having a pattern shape different from that of the light shielding pattern, such that the optical pattern controls the extent of the light that is diffused and the light that is shielded;
- wherein the light shielding pattern has a pattern shape having a recess and a protrusion in a light emission direction,
- wherein the diffusion pattern shields, reflects, and diffuses light;
- wherein the light shielding pattern shields and reflects light;
- wherein the diffusion pattern is in contact with a bottom surface of the diffusion plate,
- wherein the light shielding pattern comprises a first part being in direct physical contact with a part of the diffusion pattern and vertically overlapped with the part of the diffusion pattern, and a second part vertically overlapped with the LED light source, and
- wherein the diffusion pattern is not overlapped with the LED light source and comprises a first diffusion pattern entirely vertically overlapped with the light shielding pattern, and a second diffusion pattern partially vertically overlapped with the light shielding pattern,
- wherein the optical pattern includes a first part where the first pattern and the second pattern vertically overlap each other, and a second part where the first pattern and the second pattern do not vertically overlap each other,
- wherein a thickness of the first part is greater than a thickness of the second part,
- wherein the second pattern comprises a plurality of second unit patterns,
- wherein the first pattern is formed such that a pattern density thereof decreases in a light emission direction as distance from the plurality of light emitting devices increases, and
- wherein the second pattern is formed such that a pattern density of the plurality of second unit patterns decreases in the light emission direction as distance from the plurality of light emitting devices increases.
13. The liquid crystal display of claim 12, which further comprises a prism sheet or protection sheet laminated on an upper part of the diffusion plate.
14. The light unit of claim 1,
- wherein a maximum distance from the light emitting devices to the outermost portion of the second part is greater than a maximum distance from the light emitting devices to the outermost portion of the first part.
15. The light unit of claim 1,
- wherein the first pattern has a pattern shape having a recess and a protrusion in a light emission direction.
16. The light unit of claim 1,
- wherein the optical pattern shields, reflects, and diffuses light.
17. The light unit of claim 1,
- wherein a cross section area of the first pattern is greater than a cross section area of the second pattern.
18. The light unit of claim 17,
- wherein a shape of the first pattern is different from a shape of the second pattern.
19. The light unit of claim 1,
- wherein the first pattern and the second pattern are formed so that a pattern density is lowered in a light emission direction.
20. The light unit of claim 1,
- wherein a portion of the optical pattern is disposed to vertically overlap the light emitting devices.
21. The light unit of claim 1,
- wherein the second pattern is laminated under the first pattern.
22. The light unit of claim 12,
- wherein a maximum distance from the light emitting device to the outermost portion of the second part is greater than a maximum distance from the light emitting devices to the outermost portion of the first part.
23. The light unit of claim 12,
- wherein the first pattern has a pattern shape having a recess and a protrusion in the light emission direction.
24. The light unit of claim 12,
- wherein the optical pattern shields, reflects, and diffuses light.
25. The light unit of claim 12,
- wherein a cross section area of the first pattern is greater than a cross section area of the second pattern.
26. The light unit of claim 25,
- wherein a shape of the first pattern is different from a shape of the second pattern.
27. The light unit of claim 12,
- wherein a portion of the optical pattern is disposed to vertically overlap the light emitting device.
28. The light unit of claim 12,
- wherein the second pattern is laminated under the first pattern.
29. The light unit of claim 28,
- wherein the optical pattern is laminated in dual pattern layers.
30. The light unit of claim 28,
- wherein the optical pattern is laminated in triple layers.
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Type: Grant
Filed: Apr 10, 2020
Date of Patent: Jun 7, 2022
Assignee: LG INNOTEK CO., LTD. (Seoul)
Inventors: Sic Hur (Seoul), Peng Sam Park (Seoul), Tae Oun Jung (Seoul), Kwang Ho Park (Seoul), Moo Ryong Park (Seoul)
Primary Examiner: Minh Nguyen
Application Number: 16/845,508
International Classification: G02F 1/13357 (20060101); F21V 8/00 (20060101);