KR101340141B1 - Member for controlling luminous flux, display device, and light emitting device - Google Patents

Abstract

The present invention relates to a light beam control member, a display device and a light emitting device having the same. The light beam control member of the present invention includes an optical path changing unit having scattering particles inherent in the matrix and scattering incident light, a bonding surface in which light scattered from the optical path changing unit is in close contact with the optical path changing unit; And a light direction adjusting unit including a refracting surface on which incident light is refracted and emitted. According to the present invention, the light diffusing performance in the luminous flux control member can be improved.

Description

Luminous flux control member, display device, and light emitting device {MEMBER FOR CONTROLLING LUMINOUS FLUX, DISPLAY DEVICE, AND LIGHT EMITTING DEVICE}

The present invention relates to a light beam control member, a display device and a light emitting device.

In general, a liquid crystal display (LCD) is widely used because it can realize light weight and thinness, and can reduce power consumption. At this time, the liquid crystal display device displays an image by using the property of the liquid crystal whose arrangement varies depending on the voltage or the temperature. Such a liquid crystal display device comprises a backlight unit (BLU) and a liquid crystal display panel. The backlight unit is mounted on the back surface of the liquid crystal display panel and emits light to the liquid crystal display panel. The liquid crystal display panel displays an image using light incident from the backlight unit.

In this case, the backlight unit includes a light source for substantially emitting light, and is divided into an edge method and a direct method according to the position of the light source. In the edge method, a light source is positioned at the side of the backlight unit, and is configured to guide light generated from the light source through the light guide plate to be emitted to the rear surface of the liquid crystal display panel. In the direct method, the light source is positioned corresponding to the rear surface of the liquid crystal display panel, and is configured to directly emit light generated from the light source to the rear surface of the liquid crystal display panel.

However, there is a problem that light is irradiated unevenly from the backlight unit toward the liquid crystal display panel. As a result, the performance of the liquid crystal display device may deteriorate. Therefore, an effort to improve the luminance uniformity of the liquid crystal display device is required.

SUMMARY OF THE INVENTION An object of the present invention is to provide a light flux control member, a display device, and a light emitting device for improving luminance uniformity.

The light flux control member according to the present invention for solving the above problems is an optical path changing unit including scattering particles scattering light incident in the matrix and incident from the optical path changing unit in close contact with the optical path changing unit. And a light direction adjusting unit including a coupling surface on which the scattered light is incident and a refractive surface on which the incident light is refracted and exits.

In addition, a display device according to the present invention for solving the above problems is a light source for outputting light, a drive substrate on which the light source is mounted, mounted on the drive substrate, the output light is incident, the incident light And a display panel through which the emitted light is incident, and a display panel on which the emitted light is incident, wherein the beam control member includes: an optical path changing unit having scattering particles scattering the output light; And a light direction adjusting unit including a coupling surface in which the scattered light is incident from the light path changing unit and a refractive surface in which the incident light is refracted and exits.

In addition, a light emitting device according to the present invention for solving the above problems, a light source for outputting light, a drive substrate on which the light source is mounted, mounted on the drive substrate, the output light is incident, the incident light And a light beam control member, wherein the light beam control member includes an optical path changing unit having scattering particles scattering the output light, and a light path changing unit in close contact with the optical path changing unit. And a light direction adjusting unit including a coupling surface on which the received light is incident and a refractive surface on which the incident light is refracted and exits.

The light beam control member, the display device, and the light emitting device according to the present invention can improve the light diffusion performance. For this reason, the luminous flux control member of the light emitting device emits light more uniformly toward the display panel, whereby the performance of the display device can be improved. Accordingly, luminance uniformity of the display device may be improved.

1 is an exploded perspective view showing a light emitting device according to a first embodiment of the present invention,
2 is a cross-sectional view showing one cross section of the light emitting device according to the first embodiment of the present invention;
3 is an exploded perspective view showing a light emitting device according to a second embodiment of the present invention;
4 is a cross-sectional view showing a cross section of a light emitting device according to a second embodiment of the present invention;
5 is an exploded perspective view showing a liquid crystal display device according to an embodiment of the present invention; and
FIG. 6 is a cross-sectional view illustrating a cross section taken along line AA ′ in FIG. 5.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same components are denoted by the same reference symbols as possible in the accompanying drawings. Further, the detailed description of known functions and configurations that may obscure the gist of the present invention will be omitted.

In the following, when each panel, sheet, member, guide or unit or the like is described as being formed “on” or “under” of each panel, sheet, member guide or unit, “ “On” and “under” include those formed “directly” or “indirectly” through other components. And the upper or lower reference of each component is described with reference to the drawings. Also, in the drawings, the size of each component can be exaggerated for the sake of explanation and does not mean the size actually applied.

1 is an exploded perspective view showing a light emitting device according to a first embodiment of the present invention. 2 is a cross-sectional view showing one cross section of the light emitting device according to the first embodiment of the present invention.

1 and 2, the light emitting device 100 according to the present embodiment includes a driving substrate 110, a light source 120, and a light beam control member 130.

The drive substrate 110 is provided for support and drive control. The driving substrate 110 may be a printed circuit board (PCB). That is, the driving substrate 110 may be implemented in a flat plate structure. The driving substrate 110 is formed of a dielectric having a plurality of transmission lines (not shown). Here, the driving substrate 110 may be implemented by stacking a plurality of dielectric plates. At this time, each transmission line is exposed to the outside through both ends. Here, one end of the transmission line is connected to a drive unit (not shown). In addition, the other end of the transmission line is exposed to the outside to form a connection terminal. As a result, when the driving signal is received from the driving unit through one end, the transmission line transfers the driving signal to the connection terminal of the other end.

The light source 120 substantially generates and outputs light. The light source 120 is mounted on the driving substrate 110. In this case, the light source 120 may be adhered to the connection terminal of the driving substrate 110 through a paste and electrically connected to the driving substrate 110. When the driving signal is received from the driving substrate 110, the light source 120 drives to generate light. In this case, the light source 120 may adjust the amount of light according to the intensity of the voltage applied from the driving substrate 110.

For example, the light source 120 may be a point light source such as a light emitting diode (LED), or may be a surface light source in which a plurality of light emitting diodes are arranged. That is, the light source 120 may have a structure in which a plurality of light emitting diodes are distributed on the driving substrate 110 at predetermined intervals. Here, each light emitting diode represents a light emitting diode package including a light emitting diode chip. In addition, the light emitting diodes may emit white light, and may emit blue light, green light, and red light separately.

The light beam control member 130 scatters the light incident from the light source 120. The luminous flux control member 130 is mounted on the driving substrate 110. The light beam control member 130 covers the light source 120 on the driving substrate 110. At this time, the optical axis OA of the light source 120 passes through the center of the luminous flux control member 130. For example, the luminous flux control member 130 may cover each light emitting diode individually. Here, the light beam control member 130 may receive a part or all of the light source 120. In addition, the light beam control member 130 includes a light path changing unit 140 and a light direction adjusting unit 150.

The light path changing unit 140 changes the path of the light incident from the light source 120. The optical path changing unit 140 includes a matrix 141 and a plurality of scattering particles 143.

The matrix 141 is made of a transparent material. The matrix 141 passes through the light incident from the light source 120. In this case, the refractive index of the matrix 141 may be 1.4 to 1.5. Here, the matrix 141 includes a silicone resin, an epoxy resin, and an acrylic resin.

Scattering particles 143 are embedded in the matrix 141. That is, the scattering particles 143 are distributed and distributed in the matrix 141. The scattering particles 143 scatter the light incident through the matrix 141. At this time, the refractive index of the scattering particles 143 may exceed the refractive index of the matrix 141. Here, the refractive index of the scattering particles 143 may be 2.2. That is, the difference between the refractive index of the matrix 141 and the refractive index of the scattering particles 143 may be 0.4 to 0.5. In addition, the scattering particles 143 may have a size corresponding to the diameter of 500 nm to 10 ㎛.

In this case, the scattering particles 143 include the light conversion particles 145 and the path change particles 147. The light conversion particle 145 converts the wavelength of light incident from the light source 120. For example, the light conversion particle 145 may convert blue light into red light or green light. The light conversion particle 145 scatters the light incident from the light source 120. Here, the light conversion particle 145 includes a phosphor and a quantum dot. The path change particle 147 scatters the light incident from the light source 120. Here, the rerouting particles 147 include titanium dioxide (TiO ₂ ).

In addition, the optical path changing unit 140 may include an entrance surface 151, an emission surface 153, and a connection surface 157.

The incident surface 151 is opposite to the light source 120, and is a surface on which light is incident from the light source 120 to the light path changing unit 140. In this case, the center of the incident surface 151 is disposed at an optical axis OA of the light source 120. The incident surface 151 may be in close contact with the light source 120 to directly contact the light source 120.

For example, the recess 148 may be formed under the light path changing unit 140. In the light path changing unit 140, the recess 148 may be formed to receive some or all of the light source 120. That is, in the optical path changing unit 140, the light source 120 may be inserted into the recess 148, and the incident surface 151 inside the recess 148 may contact the light source 120. In other words, the incident surface 151 may be provided inside the recess 148. Through this, light may be incident from the light source 120 to the light path changing unit 140 without loss between the light source 120 and the light path changing unit 140. Meanwhile, the recess 148 may not be formed below the light path changing unit 140. That is, the incident surface 151 may be in contact with the light source 120 under the light path changing unit 140.

The exit surface 153 is a surface from which light is emitted. At this time, the exit surface 153 refracts light. The center of the emission surface 153 is disposed on the optical axis OA of the light source 120. That is, the emission surface 153 may be formed to have a line symmetry structure around the optical axis OA of the light source 120. In addition, the exit surface 153 may be formed as a curved surface as a whole. That is, the exit surface 153 may be concave or convex facing the entrance surface 151. Alternatively, the exit surface 153 may be formed to have at least one inflection point. Here, the inflection point means a point at which the change tendency of the curved surface is changed. In other words, the inflection point represents the point where the curved surface changes from concave to convex or from convex to concave.

For example, the recess 149 may be formed on the light path changing unit 140. The recess 149 may be formed to be concave in response to the light source 120 at the central portion of the light path changing unit 140. At this time, the center of the recess 149 is disposed on the optical axis OA of the light source 120. Here, the concave portion 149 may be formed to have a line symmetry structure around the optical axis OA of the light source 120. Through this, the exit surface 153 may be divided into a first exit surface 155 and a second exit surface 156.

The first exit surface 155 is provided inside the recess 149. The first emission surface 155 extends from the optical axis OA of the light source 120. That is, the first emission surface 155 extends in the outer direction perpendicular to or inclined to the optical axis OA along the shape of the recess 149. The first exit surface 155 reflects the light from the light path changing unit 140. In this case, the first emission surface 155 may totally reflect light. Accordingly, the first emission surface 155 may prevent the light spot from being excessively concentrated in the central portion of the luminous flux control member 130, thereby generating a hot spot.

The second exit surface 156 is provided outside of the recess 149. The second exit surface 156 is curved from the first exit surface 155 and extends to the outside of the first exit surface 155. Here, the curve means a shape that is gently bent. That is, the second emission surface 156 extends in the outward direction perpendicular to or inclined to the optical axis OA. In other words, the second exit surface 156 is disposed at an edge portion of the exit surface 153, that is, the circumferential region of the recess 149 and the first exit surface 155. In this case, the second exit surface 156 may be spherical or aspheric. In addition, the second emission surface 156 emits light from the light path changing unit 140. In this case, the light may be reflected from the first emission surface 155 and then emitted from the second emission surface 156.

The connection surface 157 connects the entrance surface 151 and the exit surface 153. The connection surface 157 is divided into a first connection surface 158 and a second connection surface 159.

The first connection surface 158 faces the driving substrate 110 and extends from the incident surface 151. In this case, the first connection surface 158 extends in the outward direction perpendicular to the optical axis OA. The first connection surface 158 is in close contact with the driving substrate 110 in the peripheral region of the light source 120.

The second connection surface 159 extends from the exit surface 153 and is connected to the first connection surface 158. In this case, the second connection surface 158 is a surface from which light is emitted from the optical path changing unit 140. Here, the light may be reflected from the first emission surface 155 and then emitted from the second connection surface 159. The second connection surface 159 surrounds the optical axis OA.

The light direction controller 160 adjusts the direction of light incident from the light path changing unit 140. In this case, the refractive index of the light direction controller 160 is less than or equal to the refractive index of the light path changing unit 140. The light direction controller 160 surrounds the light path changing unit 140 around the optical axis OA of the light source 120. For example, the light direction controller 160 may be formed in a ring shape. The light direction controller 160 is made of a transparent material. Here, the light direction control unit 160 includes a silicone resin, an epoxy resin, and an acrylic resin.

The light direction controller 160 includes a coupling surface 161, a refractive surface 163, and a rear surface 165.

The coupling surface 161 is a surface on which light is incident from the light path changing unit 140 to the light direction controller 160. In this case, the coupling surface 161 may be in close contact with the connection surface 157 of the optical path changing unit 140, that is, the second connection surface 159, and may directly contact the optical path changing unit 140. The coupling surface 161 surrounds the optical axis OA. Here, the coupling surface 161 may be implemented in the same shape as the second connection surface 159. In addition, the angle θ ₁ formed between the normal axis of the optical axis OA and the coupling surface 161 may be greater than 30 degrees and less than 100 degrees.

The refracting surface 163 is a surface from which light is emitted from the light direction adjusting unit 160. At this time, the refracting surface 163 refracts light. This refractive surface 163 extends from the mating surface 161. The refractive surface 163 surrounds the optical axis OA and surrounds the coupling surface 161.

The rear surface 165 connects the coupling surface 161 and the refractive surface 163. At this time, the rear surface 165 is opposed to the driving substrate 110. That is, the rear surface 165 extends in the outward direction perpendicular to the optical axis OA. The rear surface 165 is in close contact with the driving substrate 110 at the connection surface 157, that is, at the peripheral region of the first connection surface 158.

That is, in the light beam control member 130 of the present embodiment, the light is incident through the incident surface 151 and then scattered in the scattering particles 143. In the light beam control member 130, the light is emitted to the exit surface 153 of the light path changing unit 140 or the refractive surface 163 of the light direction control unit 160. That is, in the light path changing unit 140, the light is emitted to the emission surface 153 or the connection surface 157. Here, the light may be reflected from the first emission surface 155 and then emitted to the second emission surface 156 or the connection surface 157. In addition, in the light direction controller 160, light is incident on the coupling surface 161 and then emitted to the refractive surface 163.

3 is an exploded perspective view showing a light emitting device according to a second embodiment of the present invention. 4 is a cross-sectional view showing one cross section of the light emitting device according to the second embodiment of the present invention.

3 and 4, the light emitting device 200 according to the present embodiment includes a driving substrate 210, a light source 220, and a light beam control member 230. At this time, in the light emitting device 200 according to the present embodiment, the basic configurations of the driving substrate 210, the light source 220, and the light beam control member 230 are similar to those of the above-described embodiment, and thus a detailed description thereof will be omitted. However, in the light emitting device 200 according to the present embodiment, there is a difference in the luminous flux control member 230 from the corresponding configuration of the above-described embodiment, which will be described below with reference to this embodiment.

In the light emitting device 200 of the present embodiment, the light path changing unit 240 of the light beam control member 230 includes a light converting unit 244 and a path changing unit 246. In this case, the optical path changing unit 240 is implemented in a structure in which the path changing unit 246 is stacked on the light conversion unit 244.

The optical path changing unit 240 includes an incident surface 251, an intermediate surface 252, an emission surface 253, and a connection surface 257. Here, the intermediate surface 252 is a surface formed between the light conversion unit 244 and the path change unit 246 as the light conversion unit 244 and the path change unit 246 are stacked. The intermediate surface 252 includes an intermediate emission surface 252a and an intermediate incident surface 252b. The intermediate emission surface 252a and the intermediate incident surface 252b are opposed to each other. In addition, the connection surface 257 is divided into a first connection surface 258 and a second connection surface 259.

The light converter 244 changes the wavelength of light incident from the light source 220. The light converter 244 changes the path of the light incident from the light source 220. The light conversion unit 244 includes a first matrix 241a and a plurality of light conversion particles 245.

The first matrix 241a is made of a transparent material. The first matrix 241a passes the light incident from the light source 120. In this case, the refractive index of the first matrix 241a may be 1.4 to 1.5. Here, the first matrix 241a includes a silicone resin, an epoxy resin, and an acrylic resin.

The light conversion particles 245 are embedded in the first matrix 241a. That is, the light conversion particles 245 are distributed and distributed in the first matrix 241a. The light conversion particle 245 converts the wavelength of the light incident from the light source 120. For example, the light conversion particles 245 may convert blue light into red light or green light. In addition, the light conversion particle 245 scatters the light incident from the light source 220. At this time, the refractive index of the light conversion particles 245 may exceed the refractive index of the first matrix 241a. Here, the light conversion particle 245 includes a phosphor and a quantum dot.

The light conversion unit 244 includes an incident surface 251, an intermediate emission surface 252a, and a first connection surface 258.

The incident surface 251 is opposite to the light source 220 and is a surface on which light is incident from the light source 220 to the light conversion unit 244. At this time, the center of the incident surface 251 is disposed on the optical axis OA of the light source 220. The incident surface 251 may be in close contact with the light source 220, and may be in direct contact with the light source 220.

The intermediate emission surface 252a is a surface from which light is emitted from the light conversion unit 244. The center of the intermediate emission surface 252a is disposed at the optical axis OA of the light source 220. That is, the intermediate emission surface 252a may be formed to have a line symmetry structure around the optical axis OA of the light source 220. In addition, the intermediate exit surface 252a may be formed as a curved surface as a whole. That is, the intermediate emission surface 252a may be formed convexly facing the incident surface 251.

The first connection surface 258 extends from the incident surface 251. In this case, the first connection surface 258 extends in the outward direction perpendicular to the optical axis OA. The first connection surface 258 is in close contact with the driving substrate 210 in the peripheral area of the light source 220.

In this case, the first connection surface 258 may extend in an outward direction perpendicular to the optical axis OA, and then may be extended by changing directions through bending. Through this, the first connection surface 258 may be divided into the substrate contact surface 258a and the intermediate connection surface 258b. The substrate adhesion surface 258a extends in the outward direction perpendicular to the optical axis OA. The substrate adhesion surface 258a is in close contact with the driving substrate 210 in the peripheral region of the light source 220. The intermediate connection surface 258b extends from the substrate adhesion surface 258a. At this time, the intermediate connecting surface 258b is a surface from which light is emitted from the light conversion unit 244. This intermediate connecting surface 258b surrounds the optical axis OA.

The path changing unit 246 changes the path of the light incident from the light converter 244. At this time, the refractive index of the path changing unit 246 is equal to or less than the refractive index of the light conversion unit 244. The path changer 246 includes a second matrix 241b and path change particles 247.

The second matrix 241b is made of a transparent material. The second matrix 241b passes the light incident from the light converter 244. At this time, the refractive index of the second matrix 241b is less than or equal to the refractive index of the first matrix 241a. The refractive index of the second matrix 241b may be 1.4 to 1.5. Here, the second matrix 241b includes a silicone resin, an epoxy resin, and an acrylic resin.

Rerouting particles 247 are embedded in the second matrix 241b. That is, the path change particles 247 scatters the light incident from the light converter 244 again. At this time, the refractive index of the path change particles 247 may exceed the refractive index of the second matrix 241b. Here, the rerouting particles 247 include titanium dioxide.

The path changing unit 246 includes an intermediate entrance surface 252b, an emission surface 253, and a second connection surface 259.

The intermediate incident surface 252b is opposite to the intermediate emission surface 252a and is a surface on which light is incident from the light converter 244 to the path changing unit 246. At this time, the center of the intermediate incident surface 252b is disposed on the optical axis OA of the light source 220. The intermediate incidence surface 252b may be in close contact with the intermediate emission surface 252a to be in direct contact with the light conversion unit 244. Here, the intermediate incident surface 252a may be implemented in the same shape as the intermediate emission surface 251a.

The exit surface 253 is a surface from which light is emitted from the path change unit 246. The center of the emission surface 253 is disposed on the optical axis OA of the light source 220. That is, the emission surface 253 may be formed to have a line symmetry structure around the optical axis OA of the light source 220. In addition, the exit surface 253 may be formed as a curved surface as a whole. That is, the exit surface 253 may be concave or convex facing the entrance surface 251. Alternatively, the exit surface 253 may be formed to have at least one inflection point.

The second connection surface 259 extends from the exit surface 253 and is connected to the first connection surface 258. Here, the second connection surface 259 may be connected to the intermediate connection surface 258b of the first connection surface 258. At this time, the second connection surface 28 is a surface from which the light is emitted from the path changing unit 246. The second connection surface 259 surrounds the optical axis OA.

In the light emitting device 200 of the present embodiment, the light direction controller 260 of the luminous flux control member 230 includes a coupling surface 261, a refractive surface 263, and a rear surface 265.

The coupling surface 261 is a surface on which light is incident from the light path changing unit 240 to the light direction adjusting unit 260. In this case, the coupling surface 261 may be in close contact with the connection surface 257 of the optical path changing unit 240, that is, the second connection surface 259, and may directly contact the optical path changing unit 240. In this case, the coupling surface 261 may be in close contact with the intermediate connection surface 258b of the first connection surface 258, and may contact the light conversion unit 244 and the path changing unit 246 separately. The angle θ ₁ formed between the optical axis OA of the light source 220 and the coupling surface 261 may be greater than 30 degrees and less than 100 degrees.

The refracting surface 263 is a surface from which light is emitted. At this time, the refracting surface 263 refracts light. This refractive surface 263 extends from the mating surface 261. And the refractive surface 263 surrounds the circumference of the coupling surface 261.

The rear surface 265 connects the coupling surface 261 and the refractive surface 263. At this time, the rear surface 265 is opposed to the driving substrate 210. That is, the rear surface 265 extends in the outward direction horizontal to the optical axis OA. The back surface 265 is in close contact with the driving substrate 210 in the connection surface 257, that is, the peripheral area of the first connection surface 258.

5 is an exploded perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention. 6 is a cross-sectional view illustrating a cross section taken along line AA ′ in FIG. 5.

5 and 6, the liquid crystal display device 10 according to the present embodiment includes a backlight unit 20, a liquid crystal display panel 60, a panel control board 70, a panel guide 80, and an upper case 90. ).

The backlight unit 20 performs a function of generating and outputting light. At this time, the backlight unit 20 is implemented in a direct manner according to the embodiment of the present invention. The backlight unit 20 includes a lower cover 30, a light emitting device 40, and at least one optical sheet 50.

The lower cover 30 is implemented in a box shape with an upper surface opened. The lower cover 30 accommodates the light emitting device 40 through the upper part to support and protect the light emitting device 40. The lower cover 30 supports the optical sheet 50 and the liquid crystal display panel 60. In this case, the lower cover 30 may be made of metal. For example, the lower cover 30 may be formed as the metal plate is bent or curved. Here, as the metal plate is bent or curved, an insertion space of the light emitting device 40 may be formed in the lower cover 30.

The light emitting device 40 includes a driving substrate 41, a plurality of light sources 43, and a plurality of luminous flux control members 45.

The light sources 43 are mounted on the large drive substrate 41. Here, on the driving substrate 41, the light sources 43 are arranged to be distributed at regular intervals. For example, the light sources 43 may be arranged in a grid structure. The light sources 43 are electrically connected to the driving substrate 41.

The luminous flux control members 45 cover the light sources 43 individually. At this time, the light beam control member 45 may be configured as described above. The light beam control member 45 scatters the light incident from the light source 43 and emits the light.

The optical sheet 50 improves and passes the characteristics of the light incident from the light emitting device 40. In this case, the optical sheet 50 may be, for example, a polarizing sheet, a prism sheet, or a diffusion sheet.

The liquid crystal display panel 60 performs a function of displaying an image by using light input from the backlight unit 20. The liquid crystal display panel 60 is mounted on the backlight unit 20 through the rear surface.

Although not shown, the liquid crystal display panel 60 is bonded to a thin film transistor (TFT) substrate, a color filter (C / F) substrate, and a thin film transistor, which are bonded to maintain a uniform cell gap facing each other. And a liquid crystal layer interposed between the substrate and the color filter substrate. The thin film transistor substrate changes the arrangement of liquid crystals in the liquid crystal layer. Through this, the thin film transistor substrate changes the light transmittance of light passing through the optical sheet. The thin film transistor substrate has a structure in which a plurality of gate lines are formed, a plurality of data lines intersecting the plurality of gate lines, and a thin film transistor is formed in a crossing region between the gate line and the data line. And the color filter substrate emits light having passed through the liquid crystal layer in a certain color.

The panel control boards 71 and 73 are provided for controlling the liquid crystal display panel 60. The panel control boards 71 and 73 are composed of a gate driving board 71 and a data driving board 73. In this case, the panel control boards 71 and 73 are electrically connected to the liquid crystal display panel 60 by a chip on film (COF). Here, the COF can be changed to a TCP (Tape Carrier Package).

The panel guide 80 supports the liquid crystal display panel 60. The panel guide 80 is disposed between the backlight unit 20 and the liquid crystal display panel 60.

The upper case 90 is configured to surround the edge portion of the liquid crystal display panel 60. The upper case 90 may be coupled to the panel guide 80.

According to the present invention, as the exit surface of the luminous flux control member is formed concave or convex, or is formed to have at least one inflection point, it is possible to prevent excessive concentration of light in the central portion of the luminous flux control member. In the luminous flux control member, since the light scattered by the optical path changing part can be refracted by the luminous direction control part, the light diffusion performance in the luminous flux control member can be improved. For this reason, the performance of the display device may be improved by irradiating the light unit more uniformly toward the liquid crystal display panel. Accordingly, luminance uniformity of the display device may be improved.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of the present invention in order to facilitate the understanding of the present invention and are not intended to limit the scope of the present invention. That is, it will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible.

Claims (15)

An optical path changing unit including scattering particles inherent in the matrix and scattering incident light;
A light direction control surrounding a side of the optical path changing part, the optical path changing part including a coupling surface in which the scattered light is incident from the optical path changing unit and a refractive surface in which the incident light is refracted and exits; The light beam control member characterized by including a part. The method of claim 1, wherein the optical path changing unit,
And a connection surface that connects the incident surface to the incident surface, the emission surface facing the incident surface, and the incident surface and the emission surface, and which is in close contact with the coupling surface. The method of claim 2, wherein the optical path changing unit,
A light conversion unit converting and scattering the light;
And a path changing part stacked on the light converting part and scattering the scattered light again. The method of claim 3, wherein
The connection surface is divided into a first connection surface in contact with the coupling surface in the light conversion unit and a second connection surface in contact with the coupling surface in the path changing unit,
The optical path changing unit,
And an intermediate surface defining the light conversion unit and the path change unit at a boundary between the light conversion unit and the path change unit. The method of claim 3, wherein
And a refractive index of the light converting portion is equal to or less than a refractive index of the path changing portion. 3. The method of claim 2,
And an angle formed by the normal axis of the central axis extending from the center of the incident surface to the center of the exit surface and the engaging surface is greater than 30 degrees and less than 100 degrees. 3. The method of claim 2,
And the exit surface is concave or convex facing the entrance surface or has at least one inflection point. The method of claim 1, wherein the light direction control unit,
A luminous flux control member comprising silicone resin. The method of claim 1,
And the refractive index of the scattering particles exceeds the refractive index of the matrix. The method of claim 9,
The scattering particle is a light flux control member, characterized in that it comprises titanium dioxide and phosphor. A light source for outputting light,
A driving substrate on which the light source is mounted;
A light beam control member mounted on the driving substrate, the output light is incident, and the incident light is emitted;
A display panel to which the emitted light is incident;
The luminous flux control member,
An optical path changing unit having scattering particles scattering the output light;
A light direction control surrounding a side of the optical path changing part, the optical path changing part including a coupling surface in which the scattered light is incident from the optical path changing unit and a refractive surface in which the incident light is refracted and exits; And a display unit. The method of claim 11, wherein the optical path changing unit,
And an entrance surface on which the output light is incident, an emission surface facing the entrance surface, and a connection surface connecting the entrance surface and the exit surface and in close contact with the coupling surface. The method of claim 11, wherein the optical path changing unit,
A light conversion unit converting and scattering the output light;
And a path changing part stacked on the light converting part and scattering the scattered light again. A light source for outputting light,
A driving substrate on which the light source is mounted;
A light beam control member mounted on the driving substrate, the output light is incident, and the incident light is emitted;
The luminous flux control member,
An optical path changing unit having scattering particles scattering the output light;
A light direction controller which surrounds a side of the light path changing unit and is in close contact with the light path changing unit and includes a coupling surface on which the scattered light is incident from the light path changing unit and a refractive surface on which the incident light is refracted and exits; Light emitting device comprising a. The optical path changing unit of claim 14,
A light conversion unit converting and scattering the output light;
And a path changing unit stacked on the light converting unit and scattering the scattered light again.

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