KR20130004661A

KR20130004661A - Light source module, backlight unit, display apparatus, television set and illumination apparatus

Info

Publication number: KR20130004661A
Application number: KR1020110065836A
Authority: KR
Inventors: 홍대운; 박정규; 전영근; 최승아; 국정규
Original assignee: 삼성전자주식회사
Priority date: 2011-07-04
Filing date: 2011-07-04
Publication date: 2013-01-14

Abstract

The present invention relates to a light source module, a backlight unit, a display device, a television set, and an illumination device, wherein an aspect of the present invention relates to at least one light source unit including a light emitting device that emits light when an electric signal is applied, and an upper portion of the light source unit. A first optical sheet disposed and protruding from the first main surface, the first optical sheet having first and second main surfaces respectively provided as an incident surface and an exit surface of the light emitted from the light source unit; A first support portion for supporting the first optical sheet together with a support structure to separate the first optical sheet from the light source portion, a second optical sheet and the second optical sheet disposed on the second main surface side of the first optical sheet; Two protruded from the main surface and supporting the second optical sheet alone or in combination with other additional support structures. Than the second optical sheet is to provide a light source module comprising a second support to be spaced apart from the first optical sheet.

Description

Light source module, backlight unit, display unit, television set and lighting unit {LIGHT SOURCE MODULE, BACKLIGHT UNIT, DISPLAY APPARATUS, TELEVISION SET AND ILLUMINATION APPARATUS}

The present invention relates to a light source module, a backlight unit, a display device, a television set and a lighting device.

A light emitting diode (LED), which is one type of semiconductor light emitting device, is a semiconductor device capable of generating light of various colors due to recombination of electrons and holes at a junction portion of p and n type semiconductors when an electric current is applied. Such a light emitting diode has been continuously increasing in demand because it has many advantages such as a long lifetime, a low power supply, an excellent initial driving characteristic, and a high vibration resistance as compared with a light emitting device based on a filament. Particularly, in recent years, a group III nitride semiconductor capable of emitting light in a short wavelength range of a blue series has been spotlighted.

Meanwhile, in the case of a light source module used for an LCD backlight, a cold cathode fluorescent lamp (CCFL) has been used in the past, but since CCFL uses mercury gas, it may cause environmental pollution, slow response speed, and color. In addition to low reproducibility, it has disadvantages that are not suitable for light and small size reduction of LCD panels. On the other hand, the light emitting diodes are environmentally friendly, can respond to high speeds of several nanoseconds, and are effective in video signal streams, enabling impulsive driving, 100% or more color reproduction, and red, green, and blue light emitting diodes. In addition, the brightness, color temperature, and the like can be arbitrarily changed by adjusting the amount of light, and since they have advantages that are suitable for light and small size reduction of the LCD panel, the situation has been actively adopted as a light source module for a backlight.

One of the objects of the present invention is to provide a light source module having a support structure capable of stably supporting the optical sheet while reducing the optical distance and reducing the number of light sources in the light source module having the optical sheet.

Yet another object of the present invention is to provide a backlight unit having a light thickness and excellent light uniformity by providing the light source module.

Another object of the present invention is to provide a display device having the light source module.

Another object of the present invention is to provide a television set having the above light source module.

Yet another object of the present invention is to provide a lighting device having the above light source module.

According to an aspect of the present invention,

At least one light source unit including a light emitting element emitting light when an electric signal is applied, and first and second main surfaces disposed on the light source unit and provided as incident and exit surfaces of the light emitted from the light source unit, respectively. A first support portion formed to extend from the first main surface and to protrude from the first main surface, and to support the first optical sheet alone or with another additional support structure so that the first optical sheet is spaced apart from the light source portion And a second optical sheet disposed on the second main surface side of the first optical sheet and extending from the second main surface to protrude, and supporting the second optical sheet alone or in combination with another additional support structure. It provides a light source module including a second support for allowing the second optical sheet to be spaced apart from the first optical sheet.

In one embodiment of the present invention, the second optical sheet may be a light-transmissive dielectric layer may include a light-transmissive base and diffusion particles dispersed therein.

In one embodiment of the present invention, at least one of the first and the second support may be made of the same material as the first optical sheet.

In one embodiment of the present invention, the first optical sheet exhibits a bidirectional transmittance distribution function characteristic having a first and a second peak at an emission angle of less than 0 ° and more than 0 °, respectively. Can be.

In one embodiment of the present invention, the first optical sheet may include a concave-convex structure formed on the second main surface side.

In this case, the concave-convex structure includes a plurality of polygonal pyramidal structures, at least some of the polygonal pyramid structures may include a plurality of inclined surfaces disposed to be inclined in a horizontal plane, and the plurality of inclined surfaces may have different inclination angles.

In this case, inclined surfaces of the plurality of polygonal structures adjacent to each other may have different inclination angles.

In addition, at least some of the plurality of polygonal pyramid structures may have different heights from each other.

In addition, at least some of the plurality of polygonal pyramid structures may overlap with other adjacent structures.

In addition, the second support portion may be provided by being formed higher than others of the uneven structure.

In an embodiment of the present disclosure, the first optical sheet may include a lens part formed in an area corresponding to the light source part of the second main surface.

In this case, a region recessed in the direction in which the light source unit is positioned may be formed in the central region of the lens unit such that light passing through the second main surface is guided in the lateral direction.

In an embodiment of the present disclosure, the first optical sheet may include a diffusion part including light diffusion particles in a region corresponding to the light source unit.

In one embodiment of the present invention, the first optical sheet may include an uneven structure formed on the first and second main surface side.

In one embodiment of the present invention, the first optical sheet may be formed in a region corresponding to the light source unit, and may include one or more optical holes penetrating the first optical sheet in a thickness direction.

In one embodiment of the present invention, the first support portion may have a shape corresponding to the outer surface of the light source portion to be coupled to the light source portion.

In an embodiment of the present disclosure, at least one of the first and second main surfaces may be formed to have a curved portion so that the first optical sheet has a lens shape.

In an embodiment of the present disclosure, the first support part may contact a circuit board provided as a mounting part of the light source part.

In one embodiment of the present invention, the first support portion may contact the chassis structure accommodating the light source portion, the first and second optical sheets.

Another aspect of the invention,

At least one light source unit including a light emitting element emitting light when an electric signal is applied, and first and second main surfaces disposed on the light source unit and provided as incident and exit surfaces of the light emitted from the light source unit. A first support portion formed to extend and protrude from the first main surface, and to support the first optical sheet alone or with another additional support structure so that the first optical sheet is spaced apart from the light source portion; A second optical sheet disposed on the second main surface side of the first optical sheet and extending from the second main surface to protrude, and supporting the second optical sheet alone or in combination with another additional supporting structure; A second support for allowing a second optical sheet to be spaced apart from the first optical sheet, wherein the first optical sheet is less than 0 degrees and 0 degrees. Bidirectional Transmittance Distribution Function characteristics having first and second peaks at excess radiation angles, respectively, wherein the second optical sheet has a structure having diffused particles dispersed inside the light transmissive base. It provides a backlight unit having a.

In one embodiment of the present invention, it may further include a brightness enhancement sheet disposed on the path of the light transmitted through the second optical sheet.

Another aspect of the invention,

At least one light source unit including a light emitting element emitting light when an electric signal is applied, and first and second main surfaces disposed on the light source unit and provided as incident and exit surfaces of the light emitted from the light source unit. A first support portion formed to extend and protrude from the first main surface, and to support the first optical sheet alone or with another additional support structure so that the first optical sheet is spaced apart from the light source portion; And a second optical sheet disposed on the second main surface side of the first optical sheet, a display panel disposed on the second optical sheet and extending from the second main surface to protrude from the second optical sheet. An additional support structure for supporting said second optical sheet such that said second optical sheet is spaced apart from said first optical sheet A second support, wherein the first optical sheet exhibits a bidirectional transmittance distribution function characteristic having a first and a second peak at an angle of radiation below 0 ° and above 0 °, respectively, The second optical sheet provides a display device having a structure including diffused particles dispersed inside a light-transmissive base.

Still another aspect of the present invention provides a television set comprising the above display device.

Another aspect of the invention,

At least one light source unit including a light emitting element emitting light when an electric signal is applied, and first and second main surfaces disposed on the light source unit and provided as incident and exit surfaces of the light emitted from the light source unit. A first support portion formed to extend and protrude from the first main surface, and to support the first optical sheet alone or with another additional support structure so that the first optical sheet is spaced apart from the light source portion; And a second optical sheet disposed on the second main surface side of the first optical sheet, a display panel disposed on the second optical sheet, and protruding from the second main surface to protrude. Supporting the second optical sheet together with another additional support structure such that the second optical sheet is spaced apart from the first optical sheet A support structure, a housing arranged to surround the light source portion, the first and second optical sheets, and a socket structure electrically connected to the light source portion, wherein the first optical sheet has an emission angle of less than 0 ° and greater than 0 °. Characterized by the bidirectional transmission distribution function (Bidirectional Transmittance Distribution Function) characteristics of the form having a first and a second peak, respectively, characterized in that the second optical sheet has a structure having diffused particles dispersed inside the light transmitting base Provide a lighting device.

According to an embodiment of the present invention, a light source module having a support structure capable of stably supporting the optical sheet while reducing the optical distance and reducing the number of light sources in the light source module having the optical sheet can be obtained. .

In addition, by providing the light source module described above, a backlight unit, a display device, a television set, and a lighting device having a thin thickness and excellent light uniformity can be obtained.

1 is a cross-sectional view schematically showing a light source module according to an embodiment of the present invention.
2, 3 and 5 are cross-sectional views schematically illustrating an example of a light source unit that may be used in the light source module of FIG. 1.
4 is a graph illustrating an example of a light distribution pattern that may have a light source unit of FIG. 1.
6 is a cross-sectional view schematically illustrating another example of the light source unit of FIG. 1, and FIG. 7 is a graph illustrating another example of a light distribution pattern that the light source unit of FIG. 1 may have.
8 to 10 are plan views schematically illustrating optical sheets that may be used in the light source module of FIG. 1.
FIG. 11 is a schematic cross-sectional view of an example of a first optical sheet that may be employed in the light source module of FIG. 1.
FIG. 12 is an image of a surface of the first optical sheet that may have a cross-sectional shape of FIG. 11.
FIG. 13 is a graph illustrating an example of a bidirectional transmission distribution function that the first optical sheet may have.
14 is a cross-sectional view schematically illustrating an example of a second optical sheet that may be employed in the light source module of FIG. 1.
15 and 16 are cross-sectional views schematically showing a light source module according to another embodiment of the present invention.
17 to 22 are cross-sectional views schematically showing a light source module according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings may be exaggerated for clarity of description, and the elements denoted by the same reference numerals in the drawings are the same elements.

1 is a cross-sectional view schematically showing a light source module according to an embodiment of the present invention. 2, 3 and 5 are cross-sectional views schematically illustrating an example of a light source unit that may be used in the light source module of FIG. 1. In addition, FIG. 4 is a graph illustrating an example of a light distribution pattern that may be included in the light source of FIG. 1, in which the horizontal axis represents a radiation angle, and the light intensity on the vertical axis represents a relative value. 6 is a cross-sectional view schematically illustrating another example of the light source unit of FIG. 1, and FIG. 7 is a graph illustrating another example of a light distribution pattern that the light source unit of FIG. 1 may have.

First, referring to FIG. 1, the light source module 100 according to the present embodiment includes a light source unit 101, first and second optical sheets 103 and 104, and in addition, a light source unit 101. It may include a circuit board 102, the brightness enhancement sheet 105 disposed on the second optical sheet 104 is mounted. As shown in FIG. 2, the light source unit 101 includes a light emitting element 111 that emits light when an electric signal is applied, and the light source module 100 includes one or more light sources 101 in the present embodiment. ) May be included. In this case, the lens unit 113 may be disposed on the path of the light emitted from the light emitting element 111. In addition, the package substrate 112 may be electrically connected to the light emitting device 111. Examples of the package substrate 112 include a substrate such as a PCB, an MCPCB, an MPCB, an FPCB, a lead frame, and the like. . The light emitting device 111 may be any device that emits light when an electric signal is applied, and preferably, a light emitting diode may be used.

In this case, in the example of FIG. 2, a light emitting device 111 is provided in the light source unit 101, but a plurality of light emitting devices 111 may be provided as necessary. For example, one light source unit 101 may be provided with a light emitting device that emits light of red, green, and blue, respectively, as will be described later, the light source unit 101 and the first optical sheet proposed in this embodiment By using (103), it is possible to obtain white light in which the three-color light has excellent mixing characteristics. Of course, according to the embodiment, the light emitted from the plurality of light source units 101 provided in the light source module 100 may have colors.

As another example, a wavelength conversion material (eg, a phosphor, a quantum dot, etc.) for converting light emitted from the light emitting device 111 into another color may be dispersed in the lens unit 113. Reference numeral 111 emits blue light, and the wavelength conversion material may include at least one of green, yellow, and red phosphors. In the case of the structure in which the wavelength conversion material is dispersed in the lens unit 113, all of the following embodiments may be reflected. As another example, the wavelength conversion material may be applied to a position other than the lens unit 113, for example, at a position coated on the surface of the light emitting element 111 or spaced apart from the light emitting element 111 at the package level. Can be arranged. Further, as will be described later, the wavelength conversion material may be applied to the surface or the inside of the first optical sheet 103.

Meanwhile, in the example of FIG. 2, the light source unit 101 has a package structure in which the light source unit 101 is disposed on the flat package substrate 112. However, the light emitting device 111 may be disposed in the package body having a reflective cup shape. As will be described later, the light distribution pattern intended in the present embodiment may be modified into various structures. For example, like the modified light source unit 101 ′ shown in the cross-sectional view of FIG. 3A, the light emitting device 111 may include at least one of the first and second lead frames 112a and 112b (see FIG. In the exemplary embodiment, the light emitting device 111 may be electrically connected to the light emitting device 111 and the first and second lead frames 112a and 112b by the conductive wire W. However, depending on the shape of the light emitting device 111, only one conductive wire W may or may not be required. For example, in the structure in which the electrode of the light emitting device 111 is formed on the upper and lower surfaces with the light emitting structure interposed therebetween, the conductive wire W may be used. Only one (W) may be required, and when the light emitting device 111 is disposed over two lead frames 112a and 112b in the form of a flip chip, the conductive wire W may not be separately required.

Meanwhile, in the light source unit 101 ′ of FIG. 3, lower surfaces of the first and second lead frames 112a and 112b may be exposed to the outside and provided as an electrical connection unit, thereby improving heat dissipation effect. Can be. In this case, as shown in the top plan view of FIG. 3B, the first lead frame 112a may have a portion of the portion facing the second lead frame 112b so that the second lead frame 112b receives the same. Corresponding portions may be formed concave, and the coupling force with the lens unit 113 may be improved by this structure. The lens unit 113 may be made of a light-transmissive resin and may be combined with the first and second lead frames 112a and 112b to support them. Although not specifically illustrated, the first and second lead frames 112a and 112b may include a hole, a stepped structure, or a combination thereof to further increase the contact area with the lens unit 113.

On the other hand, the light source unit 101 may be provided in a form other than the package form. That is, it may be provided in a so-called, chip on board (COB) structure as shown in Figure 5, specifically, the light emitting element 111 is mounted directly on the circuit board 102, the lens portion 114 It may be disposed on and in contact with the circuit board 102. Meanwhile, the circuit board 102 illustrated in FIG. 1 provides a mounting area of the light source unit 101, and a circuit board used in the art, for example, a PCB, an MCPCB, an MPCB, an FPCB, or the like may be used. In this case, the circuit board 102 may have a wiring pattern (not shown) on its surface and inside thereof, and the wiring pattern may be electrically connected to the light source unit 101.

In the case of the present embodiment, the light source unit 101 may have a light distribution pattern having a shape as shown in FIG. 4. In detail, the light source unit 101 may exhibit a light distribution pattern having a first peak and a second peak at an upper portion, that is, a radiation angle of less than 0 ° and more than 0 °, respectively, rather than 0 °. As an example, as shown in FIGS. 4A and 4B, the light distribution pattern of the light source unit 101 has a total of two peaks, that is, one peak each at a radiation angle of less than 0 ° and more than 0 °. It can have In FIG. 4, there is no peak at a radiation angle of 0 °, but according to the structure of the light source unit 101, a local peak may occur at a radiation angle of 0 °, but in this case, a peak at a radiation angle of 0 ° may be obtained. May be smaller in size than the first and second peaks.

The light source unit 101 having such a light distribution pattern has a larger relative light intensity at the periphery thereof than the upper portion (ie, 0 ° radiation angle), and may have a relatively large value (120 ° or more). Light mixing with other light source units 101 in the upper region of the light source unit 101 is caused by this optical characteristic of the light source unit 101, that is, the light is not concentrated on the upper part of the light source unit 101 and spreads to the periphery of the upper part. It may be more advantageous to, in particular, as will be described later, when combined with the first optical sheet 103 having the optical properties proposed in this embodiment, the light mixing effect can be more pronounced.

In order for the light source unit 101 to have a light distribution baton of the type shown in FIG. 4, as shown in the examples of FIGS. 2, 3, and 5, the lens units 113 and 114 are disposed directly on the light emitting element 111. Since the corresponding region has a shape recessed toward the light emitting device 111 in comparison with other regions, light may be directed to the peripheral region instead of the upper portion, and may have a large directivity angle. However, the shape of the lens unit illustrated in FIGS. 2, 3, and 5 is just an example, and the shape of the light source unit 101 or the lens unit having the light distribution pattern similar to that of FIG. 4 may be variously modified. For example, even if the lens portion is formed in a hemispherical shape, if the scattering particles or the reflecting portion are applied to the surface or the inside of the lens portion in an appropriate shape, the optical characteristics similar to those of FIG. 4 may be exhibited.

On the other hand, in the light source unit, in addition to the structure having a radiation angle of less than 0 degrees and more than 0 degrees as described above, a structure having a peak (so-called Gaussian pattern) having the largest light intensity at the radiation angle of 0 degrees as shown in FIG. It may be. The light source unit 101 ″ of FIG. 6 corresponds to an example of a structure showing such a light distribution pattern, and includes a hemispherical lens unit 113 ′ covering the light emitting element 111. In addition to such a structure, a structure in which the shape of the lens unit is changed to a shape similar to that of the lens unit 113 ′ of FIG. 6 may be used in the light source unit of FIGS. 3 and 5. When the light source unit has a light distribution pattern as shown in FIG. 7, that is, even when the light intensity is the largest at the upper portion of the light source unit 101 ``, the light incident portion has a function of guiding the light incident in the vertical direction laterally as will be described later. By arranging the first optical sheet 103 thereon, a high level of light mixing effect can be obtained, but the first optical sheet 103 is not limited to performing only a function of guiding light in the lateral direction.

The first optical sheet 103 disposed on the path of the light emitted from the light source unit 101 (in this embodiment, the upper part of the light source unit) may improve the light uniformity by changing the path of the light, in particular, in the lateral direction. To help. As described below, the first optical sheet 103 may have a concave-convex structure, a lens structure, or the like, to perform the light uniformity improving function. In addition, in the present embodiment, the first optical sheet 103 includes first and second support portions 103a and 103b, and the first support portion 103a is an incident surface of light emitted from the light source unit 101 ( It is formed so as to extend from the first main surface (provided based on Figure 1) to protrude. The first support portion 103a alone or as described below, may support the first optical sheet 103 with another additional support structure such that the first optical sheet 103 is spaced apart from the light source portion 101. For this purpose, as shown in FIG. 1, the first support part 103a may be in contact with the circuit board 102 provided as a mounting part of the light source part 101.

The second support part 103b is formed to extend from the second main surface provided as an exit surface (upper surface with reference to FIG. 1) of the first optical sheet 103 and to protrude alone, or as will be described later. The second optical sheet 104 may be spaced apart from the first optical sheet 103 by supporting the second optical sheet 104 disposed above the first optical sheet 103 together with the supporting structure. In this case, although the first and second support portions 103a and 103b are shown in a shape (for example, a cone) in which the width decreases away from the first optical sheet 103 in FIG. In consideration of the above, various shapes of the first and second supporting parts 103a and 103b may be employed, and for example, a structure such as a cylinder or a polygonal column may be used.

In addition, the first and second supports 103a and 103b may be used by selecting a light transmissive material or a light reflective material according to the intended optical properties. That is, when used as a backlight unit, the first and second support portions 103a and 103b may be formed of a light transmitting material, for example, the same material as the first optical sheet 103 in order to obtain excellent light uniformity. Alternatively, when used for lighting or the like having a specific pattern, the first and second support portions 103a and 103b may be formed of a light reflective material, for example, a metal or a light reflective resin.

The shape of the first optical sheet 103 and the various arrangements of the first and second support portions 103a and 103b will be described with reference to FIGS. 8 to 10. 8 to 10 are plan views schematically showing optical sheets that may be used in the light source module of FIG. 1. First, as illustrated in FIG. 8, the first support 103a may be arranged in rows and columns. Although not shown in FIG. 8, the second support part 103b may be disposed at a position corresponding to the first support part 103a. Alternatively, as shown in the example of FIG. 9, the first and second support portions 103a and 103b do not correspond to each other and may be alternately disposed. In addition, as shown in the example of FIG. 10, the first optical sheet 103 ′ may be formed in a mesh shape to have an open area, and the first support part 103a may be formed in columns and rows so as to correspond to the mesh shape. ) May be arranged.

As in the present embodiment, by using the protruding structure extending from the first optical sheet 103 as the support for supporting the first and second optical sheets 103 and 104, other mechanical supporting structures can not be used. Specifically, in the case of a light source module using an optical sheet, a through hole is formed in a bottom chassis or a substrate, and further, the optical sheet itself in order to support the optical sheet, and then a screw-shaped support structure is formed in the through hole. Although fastening is common, it must go through a rather complicated process of processing through holes and fastening support structures, and dust or foreign matter can penetrate through the through holes, thereby reducing the reliability of the module. In the case of the support parts 103a and 103b proposed in the present embodiment, the support parts 103a and 103b are integrally formed with the first optical sheet 103 to provide a stable support structure. Reliability can be improved.

Meanwhile, in relation to an example of the optical function of the first optical sheet 103, the first optical sheet 103 may exhibit light distribution characteristics similar to those shown in FIG. 4. This will be described in detail with reference to FIGS. 11 to 13. FIG. 11 is a schematic cross-sectional view of an example of a first optical sheet that may be employed in the light source module of FIG. 1, and an illustration of a support is omitted. FIG. 12 is an image of a surface of the first optical sheet that may have a cross-sectional shape of FIG. 11. In addition, FIG. 13 is a graph illustrating an example of an anisotropic transmission distribution function (hereinafter referred to as 'BTDF') that the first optical sheet may have. In this case, the BTDF of the optical sheet can be obtained by measuring the radiation pattern by the laser incident in the direction perpendicular to the optical sheet according to the angle.

First, referring to FIG. 13, the BTDF characteristic of the first optical sheet 103 represents a form having first and second peaks at emission angles of less than 0 ° and more than 0 °, specifically, less than 0 ° and There is one peak each at an emission angle of greater than zero degrees. In this case, the difference θ between the radiation angle of less than 0 ° and the radiation angle of more than 0 ° may range from about 20 to 50 °. As will be described later, when the first optical sheet 103 having such a light transmitting characteristic is combined with the light source units 101, 101 ′, 101 ″ having the light distribution pattern described above, the first optical sheet 103 may be disposed on the upper portion of the first optical sheet 103. The light uniformity of can be further improved. Since the light uniformity improving effect may be noticeable when the first optical sheet 103 is spaced apart from the light source unit 101 by an appropriate distance, the size of the first support part 103a may be adjusted to secure an optimal separation distance. Could be. Similarly, the size of the second support 103b may also be appropriately adjusted so as to provide an optimal separation distance between the first and second optical sheets 103 and 104. However, the BTDF characteristic of FIG. 13 is merely an example of suitable optical characteristics that the first optical sheet 103 may have, and other types of BTDF characteristics (eg, a Gaussian shape) may vary depending on the usage method of the light source module 100. You might see

Although not specifically illustrated, a wavelength converting material (for example, at least one of yellow, green, and red wavelength converting materials) such as a phosphor or a quantum dot is applied to the surface or the inside of the first optical sheet 103 to provide the light source unit 101. The light emitted from the light source (eg, blue light) may be converted, and thus, the light source module 100 may obtain light of an intended color, for example, high color rendering white light.

In the case of the first optical sheet 103, it may be employed in a variety of structures that can exhibit the above-mentioned light transmitting characteristics, an example, as shown in Figure 11, the first optical sheet 103 is on one surface The uneven structure 122 may be formed. In detail, the first optical sheet 103 includes a light transmitting base 121 and an uneven structure 122 extending therefrom. In this case, the uneven structure 122 is formed by the light incident from the light source unit 101. It is formed in the side which permeate | transmits through the 1st optical sheet 103. As shown in FIG. That is, based on FIG. 11, the light source unit 101 may be understood to be disposed under the light transmitting base 121. The light transmissive base 121 may have a thickness of about 0.5 to 1.5 mm, and may be formed of a material that is widely used to manufacture optical devices in the art, such as PMMA. The concave-convex structure 122 may have a thickness of several tens of micrometers, and may be made of the same material as the light-transmissive base 121. However, the concave-convex structure is transferred by applying ultraviolet rays or a heat-curable material to the light-transmissive base 121 and then hardened. It may be formed by passing through. However, the first optical sheet 103 does not necessarily have to have the uneven structure 122. If the first optical sheet 103 can exhibit the BTDF characteristics of FIG. 13, an optical structure having a form other than the uneven structure (eg, a scattering structure, a reflective structure, etc.) ) May be applied.

In order for the BTDF of the first optical sheet 103 to exhibit the characteristics shown in FIG. 13, the shape of the uneven structure 122 may be appropriately adjusted, and the uneven structure is suitable for spreading light incident in the vertical direction to the periphery. It may have a horn shape. However, the concave-convex structure is not necessarily limited to the shape of a horn, and the concave-convex structure of another shape may be employed if the BTDF characteristic of FIG. 13 is shown. When the concave-convex structure is formed in the shape of a horn, the light incident in the vertical direction may be spread in the lateral direction by changing the path by the inclined side of the horn-shaped structure. Here, the horn shape may be in addition to the polygonal pyramids or cones of these complex shapes, that is, the horn structure of the shape having both a planar side and a curved side.

To illustrate the example, the uneven structure is provided with a plurality of polygonal pyramidal structures, as shown in Figure 11 and 12, at least some of them are arranged horizontally, that is, inclined with the upper surface or the lower surface of the light-transmitting base 121. A plurality of inclined surfaces are provided. Looking at the shape of the polygonal pyramid structure in more detail, as can be seen in Figures 11 and 12, at least some of the plurality of polygonal pyramid structure may have two or more inclined surfaces provided therein have a different inclination angle, further, Inclined surfaces of the polygonal pyramid structures adjacent to each other may also have different inclination angles. In addition, as shown in FIG. 12, at least some of the polygonal pyramid structures may have different sizes and heights, and other polygonal pyramid structures are disposed aperiodically adjacent to the periphery of one polygonal pyramid structure. Can be. In this case, as an example of a method of completing the first optical sheet 103, such an aperiodic arrangement structure may be periodically repeated. In addition, as shown in FIG. 12, at least some of the plurality of polygonal pyramid structures may overlap with other adjacent structures. However, even if not in the shape of a polygonal pyramid optical sheet 103 has a structure of another form for having the optical characteristics of the above-described shape, for example, a cone structure can be induced in the lateral direction by changing the path of light incident in the vertical direction In this case, the cone structure may be provided in plural and arranged to form a row and a column.

On the other hand, it is preferable that the transparency of the first optical sheet 103 is high in order for the propagation path of the light to be properly spread in the lateral direction by the horn-shaped structure as described above. Thus, the first optical sheet 103 is light inside. It may not include diffusion particles. As such, when the light diffusing particles are not included in the first optical sheet 103, the light loss caused by the light diffusing particles is minimized to improve the light emission efficiency of the light source module 100 using the first optical sheet 103. Can be. However, this does not mean that the light diffusing particles should not be included in the first optical sheet 103 at all, and in the case of inevitably presenting the light diffusing particles in the manufacturing process of the first optical sheet 103 or intentionally a small amount. Will not be excluded until the light diffusing particles are dispersed in the first optical sheet 103.

Referring back to FIG. 1, the second optical sheet 104 disposed on the path of the light emitted from the first optical sheet 103 (in the present embodiment, the upper portion of the optical sheet) is formed by the second support 103b. It is supported and similar to the first optical sheet 103 in the function of changing the paths of incident light in a plurality of paths and mixing them, but its internal structure is different from the first optical sheet 103. 14 is a cross-sectional view schematically illustrating an example of a second optical sheet that may be employed in the light source module of FIG. 1. As shown in FIG. 14, the second optical sheet 104 may include a light transmitting base 131 and diffused particles 132 dispersed therein, and the diffused particles 132 may include TiO ₂ , SiO. ₂ and the like. On the other hand, the brightness enhancement sheet 105 disposed on the path of the light emitted from the second optical sheet 104 (in this embodiment, the upper part of the diffusion sheet) has the direction of light upward to provide light to the liquid crystal panel or the like. It performs a derivation function, for example, may be provided with a plurality of polygonal structure. In this case, as an example of the brightness enhancement sheet 105, a dual brightness enhancement film (DBEF), a brightness enhancement film (BEF), or the like can be used. However, the brightness enhancing sheet 105 may be excluded or replaced with another sheet according to the embodiment.

In the case of the light source module having the above-described structure, since relatively excellent light uniformity can be obtained, the optical distance or the number of light source parts can be reduced. In addition, since the simplified support is integrally provided with the optical sheet without a mechanical process such as a through hole, manufacturing efficiency and reliability of the light source module can be improved. Therefore, when the light source module is used as a backlight unit, the reliability of a display device such as an LCD may also be improved, and an image to be provided may be clearer. Furthermore, the thickness and number of light sources of a television set equipped with such a display device may be improved. This will reduce power consumption. In addition, the light source module as described above may be used as a lighting device in addition to a backlight unit, a display device, and a television set. In this case, the light source module provides an advantage of reducing the thickness or the number of light sources. That is, the housing, the socket structure, etc. may be coupled to the periphery of the light source module having the above structure, and for example, a hemispherical lens may be disposed on the light emission path of the light source module to be used as the lighting device.

Hereinafter, the structure of the light source module according to another embodiment will be described. 15 and 16 are cross-sectional views schematically showing a light source module according to another embodiment of the present invention. First, in the case of the light source module 200 of FIG. 15, similar to the embodiment of FIG. 1, the light source unit 201, the circuit board 202, the first and second optical sheets 203 and 204, and the luminance improving sheet ( 205, and first and second support portions 203a and 203b are formed on the first and second main surfaces of the first optical sheet 203. In addition, the chassis structure 206 may include a light source unit 201, first and second optical sheets 203 and 204, and the first support unit 203a may be in contact with the chassis structure 206. The first optical sheet 203 may be supported. In this case, in a structure in which the circuit board 202 is integrally formed with respect to the plurality of light source units 201, the first support part 203a may be in contact with the circuit board 202.

In the present embodiment, the chassis structure 206 may be provided as an additional support structure to support the first optical sheet 203 together with the first support 203a. To this end, as shown in FIG. 15, a stepped structure may be provided on the inner wall side of the chassis structure 206, and the first optical sheet 203 may be disposed on the stepped structure. Similarly, the second optical sheet 204 may be disposed in another stepped structure of the chassis structure 206, in which case the chassis structure 206 serves as an additional support structure for the second optical sheet 204. do. Meanwhile, in the light source module 200 ′ according to the modified example of FIG. 16, the light source module 200 ′ further includes a reflector 207 arranged around the light source 201 to guide light upward in the structure of FIG. 15. The support 203a may be in contact with the reflector 207.

17 to 22 are cross-sectional views schematically showing a light source module according to another embodiment of the present invention. In the following embodiments, there are main features in the shape of the first optical sheet, and only the light source portion, the circuit board, and the first optical sheet are shown, but all the configurations of the above-described embodiments may be included. First, in the light source module 300 of FIG. 17, the light source module 300 includes a light source unit 301, a circuit board 302, and a first optical sheet 303. The first and second main surfaces of the first optical sheet 303 may be formed on the light source module 300. First and second support portions 303a and 303b are formed. On the second main surface side of the first optical sheet 303, a lens unit is provided in a region corresponding to the light source unit 301, and the lens unit basically has a convex lens shape, but light passing through the second main surface is in the center region. It has a region recessed in the direction in which the light source unit 301 is located so as to be guided in the direction. Even when the lens unit does not have a concave-convex structure, the first optical sheet 303 may exhibit the same or similar optical characteristics as that of FIG. 13.

Next, in the light source module 400 of FIG. 18, the light source module 401 includes a light source unit 401, a circuit board 402, and a first optical sheet 403, and includes first and second main surfaces of the first optical sheet 403. First and second support portions 403a and 403b are formed in the grooves. The diffusion part D may be provided on the second main surface side of the first optical sheet 403, and the diffusion part D may include light diffusion particles in a region corresponding to the light source part 401. As described above, even if the first optical sheet 403 does not include the lens unit or the uneven structure by the diffusion unit D, light uniformity of the light emitted from the light source unit 401 may be guided laterally to improve the light uniformity. In addition, in the present embodiment, the first support portion 403a is formed larger than the second support portion 403b so as to support the first optical sheet 403 more stably, and may have the shape of a circular column or a polygonal column. Can be.

Next, in the light source module 500 of FIG. 19, the light source module 500 includes a light source unit 501, a circuit board 502, and a first optical sheet 503, and includes first and second main surfaces of the first optical sheet 503. First and second support portions 503a and 503b are formed in the grooves. As another method of changing the path of the light emitted from the light source unit 501, the first optical sheet 503 may include the uneven structure R formed on the first and second main surfaces, and the uneven structure R ) May be provided in an irregular fine pattern. By adding such an irregular fine pattern, it is possible to efficiently control the light emitted from the light source unit 501.

Next, in the light source module 600 of FIG. 20, the light source module 601 includes a light source unit 601, a circuit board 602, and a first optical sheet 603, and includes first and second main surfaces of the first optical sheet 603. The first and second supporting portions 603a and 603b are formed in the grooves. In the present embodiment, the first and second support portions 603a and 603b may be provided in different numbers at different positions, and the first optical sheet 603 may include one or more optical holes penetrating them in the thickness direction. (H) is formed. The optical hole H is not intended to support the optical sheet 603, but is a structure for controlling the direction of light emitted from the light source unit 601, and is distinguished from a through hole to which a mechanical structure is fastened. In consideration, the optical hole H may be formed in an area corresponding to the light source unit 601.

Next, in the light source module 700 of FIG. 21, the light source module 700 includes a light source unit 701, a circuit board 702, and a first optical sheet 703, and includes first and second main surfaces of the first optical sheet 703. The first and second support portions 703a and 703b are formed in the grooves. In the present embodiment, the first support part 703a may have a shape corresponding to the outer side surface of the light source part 701 so as to be coupled to the light source part 701. In order to properly express this example, the shape of the light source part 701 is provided. It is shown differently from other embodiment. As such, when the first support part 703a has a shape corresponding to the light source part 701, it may be easy to align the first optical sheet 703 on the light source part 701. In addition, in the present embodiment, the second support part 703b for supporting the second optical sheet (not shown) may be provided as part of an uneven structure for performing an optical function. That is, as shown in FIG. 21, the uneven structure is formed on the second main surface of the first optical sheet 703, and the second support part 703b may be provided by being higher than the other ones of the uneven structure. . This second support portion 703b can be easily obtained by modifying a part of the height in the process of machining the unevenness to the first optical sheet 703.

Next, in the light source module 800 of FIG. 22, the light source module 800 includes a light source unit 801, a circuit board 802, and a first optical sheet 803, and includes first and second main surfaces of the first optical sheet 803. First and second support portions 803a and 803b are formed in the grooves. Unlike the previous embodiment, the first optical sheet 803 is formed to have a curved portion at least one of the first and the second main surface to have a lens shape, instead of having a concave-convex structure or the like on the surface, and emitted from the light source unit 801 In order to guide the light in the lateral direction, as shown in FIG. 22, a region corresponding to the upper portion of the light source unit 801 may be formed in a relatively recessed shape.

The present invention is not limited by the above-described embodiments and the accompanying drawings, but is intended to be limited only by the appended claims. It will be apparent to 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. something to do.

101: light source unit 102: circuit board
103: first optical sheet 104: second optical sheet
105: luminance improving sheet 111: light emitting element
112: package substrate 112a, 112b: first and second lead frames
W: conductive wire 113, 114: lens part
121, 131: Translucent base 122: Uneven structure
132: diffusion particles 206: chassis structure
207: reflector

Claims

At least one light source unit including a light emitting device emitting light when an electric signal is applied; And
A first optical sheet disposed above the light source unit and having first and second main surfaces respectively provided as an incidence plane and an outgoing plane of light emitted from the light source unit;
A first support formed to extend from the first main surface and to protrude from the light source alone to support the first optical sheet alone or with another additional support structure;
A second optical sheet disposed on the second main surface side of the first optical sheet; And
A second support formed to extend from the second main surface and to protrude from the first optical sheet by supporting the second optical sheet alone or in combination with another additional support structure;
Light source module comprising a.

The method of claim 1,
The second optical sheet is a light source module, characterized in that the transparent dielectric layer has a transparent base and diffused particles dispersed therein.

The method of claim 1,
At least one of the first and second supports is a light source module, characterized in that made of the same material as the first optical sheet.

The method of claim 1,
The first optical sheet has a bidirectional transmittance distribution function having a first peak and a second peak at a radiation angle of less than 0 ° and more than 0 °, respectively.

The method of claim 1,
The first optical sheet includes a concave-convex structure formed on the second main surface side.

The method of claim 5,
The concave-convex structure includes a plurality of polygonal pyramidal structures, wherein at least some of the polygonal pyramid structures have a plurality of inclined surfaces disposed to be inclined in a horizontal plane, and the plurality of inclined surfaces have different inclination angles.

The method according to claim 6,
The light source module, characterized in that the inclined surfaces of the plurality of polygonal structures adjacent to each other have a different inclination angle.

The method according to claim 6,
Light source module, characterized in that at least some of the plurality of polygonal structure different from each other in height.

The method according to claim 6,
And at least some of the plurality of polygonal pyramid structures overlap with other adjacent structures.

The method of claim 5,
And the second support is formed by being formed higher than the other ones of the uneven structure.

The method of claim 1,
And the first optical sheet includes a lens part formed in an area corresponding to the light source part of the second main surface.

The method of claim 11,
And a region recessed in a direction in which the light source unit is positioned so that light passing through the second main surface is guided laterally in the central region of the lens unit.

The method of claim 1,
The first optical sheet includes a diffusion unit including light diffusion particles in a region corresponding to the light source unit.

The method of claim 1,
The first optical sheet includes a concave-convex structure formed on the first and second main surface sides.

The method of claim 1,
And the first optical sheet is formed in a region corresponding to the light source unit, and has one or more optical holes penetrating the first optical sheet in a thickness direction.

The method of claim 1,
And the first support part has a shape corresponding to an outer surface of the light source part to be coupled to the light source part.

The method of claim 1,
At least one of the first and second main surfaces is formed to have a curved portion such that the first optical sheet has a lens shape.

The method of claim 1,
And the first support part is in contact with a circuit board provided as a mounting part of the light source part.

The method of claim 1,
And the first support portion contacts the chassis structure for receiving the light source portion, the first and second optical sheets.

At least one light source unit including a light emitting device emitting light when an electric signal is applied; And
A first optical sheet disposed above the light source unit and having first and second main surfaces provided as an incident surface and an exit surface of light emitted from the light source unit;
A first support formed to extend from the first main surface and to protrude from the light source alone to support the first optical sheet alone or with another additional support structure;
A second optical sheet disposed on the second main surface side of the first optical sheet; And
A second support formed to extend from the second main surface and to protrude from the first optical sheet by supporting the second optical sheet alone or in combination with another additional support structure to separate the second optical sheet from the first optical sheet; ,
The first optical sheet exhibits a bidirectional transmittance distribution function having first and second peaks at emission angles of less than 0 ° and more than 0 °, respectively.
And the second optical sheet has a structure including diffused particles dispersed in a light-transmissive base.

21. The method of claim 20,
And a brightness enhancing sheet disposed on a path of light passing through the second optical sheet.

At least one light source unit including a light emitting device emitting light when an electric signal is applied; And
A first optical sheet disposed above the light source unit and having first and second main surfaces provided as an incident surface and an exit surface of light emitted from the light source unit;
A first support formed to extend from the first main surface and to protrude from the light source alone to support the first optical sheet alone or with another additional support structure;
A second optical sheet disposed on the second main surface side of the first optical sheet;
A display panel disposed on the second optical sheet; And
A second support formed to extend from the second main surface and to protrude from the first optical sheet by supporting the second optical sheet alone or in combination with another additional support structure to separate the second optical sheet from the first optical sheet; ,
The first optical sheet exhibits a bidirectional transmittance distribution function having first and second peaks at emission angles of less than 0 ° and more than 0 °, respectively.
And the second optical sheet has a structure including diffused particles dispersed in a light-transmissive base.

A television set comprising the display device of claim 22.

At least one light source unit including a light emitting device emitting light when an electric signal is applied; And
A first optical sheet disposed above the light source unit and having first and second main surfaces provided as an incident surface and an exit surface of light emitted from the light source unit;
A first support formed to extend from the first main surface and to protrude from the light source alone to support the first optical sheet alone or with another additional support structure;
A second optical sheet disposed on the second main surface side of the first optical sheet;
A display panel disposed on the second optical sheet;
A second support formed to extend from the second main surface and to protrude from the first optical sheet by supporting the second optical sheet alone or in combination with another additional support structure;
A housing disposed to surround the light source unit, the first and second optical sheets; And
And a socket structure electrically connected to the light source unit.
The first optical sheet exhibits a bidirectional transmittance distribution function having first and second peaks at emission angles of less than 0 ° and more than 0 °, respectively.
And the second optical sheet has a structure including diffused particles dispersed within a light-transmissive base.