KR102226239B1 - Backlight unit and image display device using the same - Google Patents

Abstract

The present invention provides a first light source, a three-dimensional light guide plate provided above the first light source and diffuses and straightens light, a second light source provided at one corner of the three-dimensional light guide plate, the first light source and the three-dimensional light guide plate It provides a backlight unit including a light guide plate housing provided to correspond to the light exit surface of and a pattern light guide plate provided on the three-dimensional light guide plate.

Description

Backlight unit and image display device using the same {BACKLIGHT UNIT AND IMAGE DISPLAY DEVICE USING THE SAME}

The present invention relates to a display device, and more particularly, a backlight unit capable of selectively turning on the light characteristics of a backlight by allowing a light source having a straight-forward and diffusing characteristic independently of a general light source to be received by a single pattern light guide plate, and the same. It relates to a video display device used.

Recently, video display devices capable of displaying 3D images have emerged in accordance with the development of technology related to video display devices and consumer desires.

The stereoscopic image display device has been introduced to a method in which a three-dimensional effect of an image is felt by using binocular parallax. For example, a technique for wearing glasses for realizing a three-dimensional effect and a method for realizing a three-dimensional effect without wearing glasses have been known.

As a method of implementing a three-dimensional effect by wearing glasses, an anaglyph method in which each eye wears blue and red sunglasses, a polarization method in which glasses with different polarizations are respectively worn for both eyes, and time-divided polarization are used. A time-division method in which spectacles equipped with polarizing shutters that are periodically repeated and synchronized with this period are worn are known.

However, the method of realizing a three-dimensional effect by glasses has problems such as inconvenience of wearing glasses and difficulty in observing objects other than images while wearing glasses.

Recently, in order to solve this problem, various methods of realizing a three-dimensional effect without wearing glasses have been developed.

Representative methods of realizing a three-dimensional effect without wearing glasses include a method using a lenticular lens and a parallax barrier method using a mask having a slit formed thereon.

According to a method of implementing a three-dimensional image using a lenticular lens, a lenticular lens is disposed between an image panel and a light source, and the lenticular lens modulates the path of light emitted from the light source to irradiate the image panel.

As the light path is modulated by the lenticular lens, the path of light reaching both eyes of the observer is changed, and accordingly, the pixel area of the liquid crystal panel visible to both eyes of the observer is slightly changed.

The observer's brain feels a three-dimensional (3D) image due to such minute differences in pixel areas visible to both eyes of the observer.

Meanwhile, according to the parallax barrier method, a mask in which transparent slits and opaque slits are repeatedly formed is disposed in front of the image panel. The observer sees the image displayed on the image panel through the transparent slit of the mask. At this time, the observer's left and right eyes see different areas of the image panel, respectively, even through the same transparent slit. The observer's brain feels a three-dimensional image due to the minute difference in the area visible to both eyes of the observer.

However, a conventional 3D image display device that implements a 3D image without wearing glasses can display only a 3D image, but it is difficult to display a flat image.

Meanwhile, recently, a switching 3D display technology capable of switching between a 2D planar image and a 3D stereoscopic image has been proposed. Representative implementation methods of this switching 3D display technology include a polarizing lens method and a single cell active lens (1-cell active). lens) method.

Among these methods, the polarization lens method operates by switching the linear polarization direction by the polarization transmission axis on the image panel through the polarization control cell, and the difference in refractive index (Δn) of the RM lens according to each linear polarization direction. This refers to a method of selectively operating a planar mode and a stereoscopic mode by determining the presence or absence of a lens effect.

In addition, the 1-cell active lens method is a structure in which a liquid crystal cell having a lens-shaped cavity is attached to an upper side of an image panel, and refractive index anisotropy (Δn) depending on whether a voltage is applied to the liquid crystal cell. It refers to a method to make the presence or absence of the lens effect by ).

However, as a problem of the conventional switching 3D display technology capable of switching between a planar image and a stereoscopic image, there may be a problem of deterioration of planar (2D) image quality along with a high material cost for the implementation of the technology.

In particular, the conventional switching 3D display structure mentioned above basically requires a separate additional liquid crystal cell and some polymerizable lens layers for controlling polarization in a manner using the polarization characteristics of liquid crystals.

Therefore, the problem of increasing the cost of manufacturing and attaching such a liquid crystal cell is acting as an important issue in commercialization of these technologies, but it is not easy to solve by using the polarization characteristics of the liquid crystal fundamentally.

In addition, in the case of the switching 3D display structure that has been studied so far, parts that serve as an optical filter for splitting a view, for example, an RM lens or a polarization control film, are the top layer of the display screen. Since it is attached to the plane (2D) mode, a problem of image quality deterioration occurs due to the attached optical filter.

On the other hand, the existing backlight unit is a single light source device that emits only the scattered diffused light source, and cannot achieve special purposes such as stereoscopic (3D) images, power saving, security, etc., and it is said that this purpose can be achieved by adding certain functions. Even if it does, it is not possible to realize both general optical characteristics and special-purpose optical characteristics at the same time. In addition, even if the general optical characteristics and the optical characteristics for a special purpose are implemented at the same time, there are restrictions on cost and size performance, etc., since it has both functions of the backlight unit.

In addition, since only a light source having one characteristic can be incident on the patterned light guide plate, it is not possible to make a function of selectively changing the light characteristic of the backlight. In particular, it is not possible to selectively turn on light sources for many viewer modes and light sources that serve as security functions for single viewers.

As described above, since the structure of the conventional light guide plate for backlight has only one light incident part and one light source, other light sources cannot be incident light. In particular, when different light sources are incident light through different light-incident portions, the pattern design is fixed, and thus uniform luminance or light-emitting functions (that is, the pattern operation direction is different) cannot be achieved, so that the desired pattern light-emitting effect cannot be obtained.

It is an object of the present invention to provide a backlight unit capable of selectively turning on the light characteristics of a backlight by allowing a light source having a straight forward and diffusing characteristic to be received by a single patterned light guide plate separately from a general light source, and an image display device using the same. .

In order to solve the above problems, in one aspect, the present invention provides a first light source, a three-dimensional light guide plate that is provided above the first light source and diffuses and moves light, and a second light guide provided at one corner of the three-dimensional light guide plate. A backlight unit including a light source, a light guide plate housing provided to correspond to an emission surface of the light of the first light source and the three-dimensional light guide plate, and a pattern light guide plate provided on the three-dimensional light guide plate may be provided.

In such a backlight unit, the first light source may be selectively driven when implementing a planar image, and the second light source may be selectively driven when implementing a stereoscopic image.

In such a backlight unit, the three-dimensional light guide plate may have a concave reflective surface in a region corresponding to the second light source.

In such a backlight unit, light emitted from the second light source is diffused toward the concave reflective surface of the three-dimensional light guide plate, and the diffused light may be reflected from the concave reflective surface and travel straight toward the exit surface of the three-dimensional light guide plate. .

In such a backlight unit, the light guide plate housing may reflect light straight through the exit surface of the three-dimensional light guide plate and send it to the inside of the pattern light guide plate.

In another aspect, the present invention provides a first light source, a three-dimensional light guide plate provided above the first light source and diffuses and straightens light, a second light source provided at one corner of the three-dimensional light guide plate, and the first light source. It is possible to provide an image display device including a light guide plate housing provided corresponding to the light exit surface of the three-dimensional light guide plate, a pattern light guide plate provided on the three-dimensional light guide plate, and an image panel provided on the pattern light guide plate.

In such an image display device, the first light source may be selectively driven when implementing a planar image, and the second light source may be selectively driven when realizing a stereoscopic image.

In such an image display device, the three-dimensional light guide plate may have a concave reflective surface in a region corresponding to the second light source.

In such an image display device, light emitted from the second light source is diffused toward the concave reflective surface of the three-dimensional light guide plate, and the diffused light is reflected from the concave reflective surface and travels straight toward the exit surface of the three-dimensional light guide plate. have.

In such an image display device, the light guide plate housing may reflect light straight through the exit surface of the three-dimensional light guide plate and send it to the inside of the pattern light guide plate.

The backlight unit and the image display device using the same according to the present invention can be driven by selectively switching the light source for the flat image and the light source for the stereoscopic image by arranging the light guide plate housing in the light incident part of the three-dimensional light guide plate so that desired light characteristics can be selected and turned on. have.

Accordingly, the present invention can implement a backlight in which light source characteristics are selectively controlled by selectively turning on two types of light sources, such as a light source that goes straight into the pattern light guide plate and a light source that is scattered.

In addition, since the present invention can be driven by selectively switching the light source for a flat image and a light source for a stereoscopic image, the image display device can be selectively converted to a security function, a power saving function, a 3D function, and a general mode.

1 is an exploded perspective view schematically showing an image display device using a backlight unit according to the present invention.
2 is a schematic cross-sectional view of an image display device using a backlight unit according to the present invention.
3 is a schematic simulation of a path through which light reflected through a concave reflective surface proceeds to a light guide plate housing according to a position of a light source disposed on a side of the light incident light guide plate in the image display device using the backlight unit according to the present invention. It is a drawing.
4 is a diagram schematically illustrating a path of light emitted from a selectively driven planar image light source in an image display device using a backlight unit according to the present invention.
5 is a diagram schematically illustrating a path of light emitted from a three-dimensional image light source that is selectively driven in an image display device using a backlight unit according to the present invention.
6 is a process in which light emitted from a three-dimensional image light source that is selectively driven in the image display device using the backlight unit according to the present invention passes through the concave reflective surface of the three-dimensional light guide plate, the light guide plate housing, and the pattern light guide plate to an image pattern It is a diagram schematically showing.

Hereinafter, a backlight unit and an image display device using the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The same reference numerals are substantially the same throughout the specification, but refer to elements. In the following description, when it is determined that a detailed description of a known function or configuration related to the present invention may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. The component names used in the following description may be selected in consideration of the ease of writing the specification, and may be different from the names of parts of an actual product.

An image display device using a backlight unit according to an embodiment of the present invention may selectively implement a planar image and a three-dimensional image.

Since the backlight unit according to the embodiment of the present invention is included in the image display device of the present invention, a description of the image display device according to the embodiment of the present invention is omitted without separate description of the backlight unit according to the embodiment of the present invention. Replaced with

1 is an exploded perspective view schematically showing an image display device using a backlight unit according to the present invention.

2 is a schematic cross-sectional view of an image display device using a backlight unit according to the present invention.

Referring to FIG. 1, an image display device 100 using a backlight unit according to the present invention includes a backlight unit (not shown) that provides light, and a flat image or a stereoscopic image by light provided from the backlight unit (not shown). It includes an image panel 190 on which an image is selectively implemented.

Although not shown in the drawings, the image panel 190 may be an image cell of a liquid crystal display (LCD), and a pair of transparent substrates disposed to face each other, that is, a color filter substrate ( (Not shown), a TFT array substrate (not shown), and a liquid crystal layer (not shown) injected therebetween.

In addition, the image panel 190 includes various electrodes (not shown) for controlling the arrangement of liquid crystals, for example, electrodes such as a gate line and a data line, a source electrode, a drain electrode, and a common electrode, and a black matrix (not shown). City) and a color filter (not shown), and a polarizing plate (not shown) may be attached to the upper and lower surfaces of the image panel 190. In this case, the color filter (not shown) includes red (R), green (G), and blue (B) color filter layers (not shown).

In addition, the image display device according to an embodiment of the present invention may include a driving circuit (not shown) for driving the image panel. Since the image panel 110 itself is self-evident to those of ordinary skill in the art to which the present invention pertains, a more detailed description thereof will be omitted.

On the other hand, the backlight unit (not shown) has a structure similar to that of a general edge type backlight, but a three-dimensional light guide plate 140 and a pattern light guide plate 170 that diffuse and straighten light are applied. The provided light source array, that is, the first light source 120 and the second light source 150 are also independently configured to have a structure that is selectively lit according to a planar image or a stereoscopic image mode.

In particular, such a backlight unit (not shown) irradiates light to the image panel 190, and when either a flat image or a three-dimensional image display mode is selected by the user, a surface light or a plurality of vertically extending It is configured to irradiate linear light to the image panel 190, respectively.

The operation of the backlight unit (not shown) may be controlled by a driving circuit for driving the image panel 190 or may be controlled by a separately provided light source control unit.

The image display device 100 having the backlight unit (not shown) is configured in an array form in which a plurality of light sources are arranged in a line in a lower cover 110 with an open top, as shown in FIGS. 1 and 2. A first light source 120 is disposed, and a three-dimensional light guide plate 140 for diffusing and straightening light is disposed above the first light source 120.

In this case, the first light source 120 may be formed of various types of light sources, such as a light emitted diode (LED) and a cold cathode fluorescent lamp (CCFL). In the present invention, a case where a light emitted diode (LED) is used as a light source.

In addition, a corner portion of one side of the three-dimensional light guide plate 140 has a curved surface so that the second light source 150 for a three-dimensional image can be disposed to face each other. One edge portion of the three-dimensional light guide plate 140 is not limited to a curved shape, and the shape of the second light source 150 may be transformed into a flat surface or other shapes according to the shape of the second light source 150. That is, the shape of the corner portion of one side of the three-dimensional light guide plate 140 may be considered to be applicable to any shape as long as the second light source 150 can be uniformly diffused into the three-dimensional light guide plate 140. At this time, the three-dimensional light guide plate 140 may be formed by injection molding a transparent thermoplastic resin such as acrylic resin, methacrylic resin, styrene resin, polycarbonate resin, respectively.

In addition, of the three-dimensional light guide plate 140, a side opposite to the corner portion is formed of a concave reflective surface 142, and a side portion in contact with the one corner portion is reflected through the concave reflective surface 142. A flat exit surface 144 is provided so that the generated light can be emitted. In this case, the concave reflective surface 142 serves to reflect light emitted and diffused from the second light source 150 to go straight toward the exit surface 144.

A second light source 150 is disposed in contact with one corner of the three-dimensional light guide plate 140. In this case, the second light source 150 may be one or more. In this case, the second light source 150 may be formed of various types of light sources, such as a light emitted diode (LED) and a cold cathode fluorescent lamp (CCFL). In the present invention, a case where a light emitted diode (LED) is used as a light source.

The first light source 120 and the second light source 150 are configured to be turned on separately. That is, if necessary, only one of the first light source 120 and the second light source 150 may be turned on and the other may be controlled to be turned off.

For example, when the image display device according to the present invention is operated to implement a three-dimensional (3D) image, the second light source 150 is turned on and the second light source 120 is turned off. When the image display device according to the present invention is operated to implement a planar (2D) image, the first light source 120 is turned on and the second light source 150 is turned off.

In addition, a semicircular light guide plate housing 130 is covered on the first light source 120 and the emission surface 144 of the three-dimensional light guide plate 140. At this time, the inner surface of the light guide plate housing 130 is treated with silver reflection (ie, a mirror mirror).

The light guide plate housing 130 serves to selectively receive light reflected on the inner surface thereof to the pattern light guide plate 170. That is, the light emitted from the first light source 120 is reflected to enter the pattern light guide plate 170, or the light diffused and straight forward from the second light source 150 is reflected to the inside of the pattern light guide plate 170. Let him enter

The light guide plate housing 130 faces the first light source 120 and the light exit surface 144 of the three-dimensional light guide plate 140, so that the first light source 120 and the three-dimensional light guide plate 140 have an emission surface 144. It is arranged to wrap around.

Further, a reflective sheet 160 is disposed on the three-dimensional light guide plate 140, and a patterned light guide plate 170 is disposed on the reflective sheet 160. In this case, the reflective sheet 160 reflects light from the lower surface of the pattern light guide plate 170 among the light flowing into the pattern light guide plate 170 so that the light is introduced into the interior of the pattern light guide plate 170 again, thereby reducing the loss of light. It performs the function of increasing the overall light efficiency by preventing it.

In addition, the patterned light guide plate 170 may be formed by injection molding a transparent thermoplastic resin such as acrylic resin, methacrylic resin, styrene resin, and polycarbonate resin. A plurality of scattering patterns (not shown) are spaced apart from each other on the inner bottom surface of the pattern light guide plate 170 in a linear manner. It is formed to be spaced apart from each other along the width direction of the pattern light guide plate 170 in an intersecting direction with respect to the traveling direction to form a linear shape, and a plurality of linear light exit patterns (not shown) are spaced apart from each other along the length direction of the pattern light guide plate 170 Can be formed.

The plurality of outgoing light patterns (not shown) may be formed in an arbitrary pattern capable of scattering by scattering light. A plurality of outgoing patterns (not shown) may be formed in various forms, such as a concave pattern, a protruding pattern, or a dot pattern, and the outgoing pattern (not shown) is a haze to increase the scattering effect. It can also be processed.

Meanwhile, the panel guide 180 is coupled to the outside of the lower cover 110 in which the light guide plate housing 130, the three-dimensional light guide plate 140, and the pattern light guide plate 170 are accommodated.

In addition, an optical sheet 174 and an image panel 190 are disposed on the panel guide 180. In this case, the optical sheet 174 performs a function of irradiating the entire surface of the image panel 190 in a more uniform state of light emitted by the patterned light guide plate 170. As such, the optical sheet 174 itself is self-evident to those of ordinary skill in the art to which the present invention pertains, so a more detailed description thereof will be omitted.

A reflective sheet 170 is disposed under the second light guide plate 140. The reflective sheet 170 reflects light from the lower surface of the second light guide plate 134 among the light that has flowed into the second light guide plate 134 and flows back into the second light guide plate 134 to reduce light loss. It performs the function of increasing the overall light efficiency by preventing it.

As described above, in the present invention, a three-dimensional light guide plate is disposed under the pattern light guide plate so as to guide straight light to the pattern light guide plate provided with a plurality of light emitting patterns, and a scattering light source, that is, a light source for a flat image, is disposed in parallel under the pattern light guide plate. , By forming a backlight unit by covering the light source and the three-dimensional light guide plate with a semicircular silver-treated housing facing the light source and the three-dimensional light guide plate, for example, the three-dimensional light guide plate is a second light source for a three-dimensional image. By reflecting the light straight from the concave reflective surface of the light guide plate housing to selectively enter the pattern light guide plate, it is possible to realize a three-dimensional image.

In addition, in the case of a selectively lit light source, for example, a first light source for a flat image, the light emitted from the first light source is selectively incident into the patterned light guide plate through the light guide plate housing, thereby realizing a flat image. .

3 is a schematic simulation of a path through which light reflected through a concave reflective surface proceeds to a light guide plate housing according to a position of a light source disposed on a side of the light incident light guide plate in the image display device using the backlight unit according to the present invention. It is a drawing.

3 is a diagram that simulates the light path reflected through the internal reflective surface of the light guide plate housing 130 according to the arrangement position of the second light source 120. As shown in the drawing, a vertical normal passing through the center of the circle (a) Starting from the line, all rays reflected on the reflective surface reach the area symmetrical with respect to the horizontal normal line (b) passing through the center of the circle. That is, area A reaches area B, and area B reaches area A.

As a result, when the first light source 120 is disposed under the horizontal normal line b, the second light source 150 can move light without loss of light between the incident light guide plate 140 and the pattern light guide plate 170.

4 is a diagram schematically illustrating a path of light emitted from a selectively driven planar image light source in an image display device using a backlight unit according to the present invention.

Referring to FIG. 4, when the first light source 120 for a planar image is operated, light emitted from the first light source 120 is reflected through a reflective surface inside the light guide plate housing 130 and the pattern light guide plate 170 It is directly incident into the pattern light guide plate 170 through the light incident surface 172 of.

In this way, the light incident into the pattern light guide plate 170 is emitted toward the image panel 190 through the upper surface of the pattern light guide plate 170 and is irradiated to the image panel 190, so that the viewer can use the same liquid crystal display as a conventional liquid crystal display device. The image displayed on the display device is felt as a two-dimensional (2D) planar image.

5 is a diagram schematically illustrating a path of light emitted from a three-dimensional image light source that is selectively driven in an image display device using a backlight unit according to the present invention.

6 is a process in which light emitted from a three-dimensional image light source that is selectively driven in the image display device using the backlight unit according to the present invention passes through the concave reflective surface of the three-dimensional light guide plate, the light guide plate housing, and the pattern light guide plate to an image pattern. It is a diagram schematically showing.

5 and 6, when implementing a stereoscopic image, when the second light source 150 is turned on while the first light source 120 is off, light emitted from the second light source 150 is After being diffused toward the concave reflective surface 142 of the three-dimensional light guide plate 140, it is reflected by the concave reflective surface 142 and proceeds in a straight direction.

The straight light reflected through the concave reflective surface 142 is directed toward the exit surface 144 of the three-dimensional light guide plate 140 and is located inside the light guide plate housing 130 disposed opposite the exit surface 144. After being reflected through the reflective spherical surface, it is incident into the pattern light guide plate 170 through the light incident surface 172 of the pattern light guide plate 170.

Among the light incident into the patterned light guide plate 170, a portion of the light-exiting pattern (not shown) provided on the lower surface of the patterned light guide plate 170 is not formed, that is, in a region between the plurality of light-exiting patterns (not shown). The reached light is reflected and proceeds back to the inside of the patterned light guide plate 170, and the light reaching a plurality of outgoing patterns (not shown) is scattered and the image on the patterned light guide plate 170 is scattered through the outgoing light pattern (not shown). As the light exits toward the panel 190, a three-dimensional image is realized through the image panel 190.

That is, the light emitted from each of the light emission patterns (not shown) passes through different pixel areas of the image panel 190 and then reaches the left and right eyes of the viewer of the viewer. Through this, you can see a three-dimensional image.

As described above, the backlight unit and the image display device using the same according to the present invention arrange the light guide plate housing in the light incident part of the three-dimensional light guide plate to selectively switch the light source for the flat image and the light source for the three-dimensional image so that desired light characteristics can be selected It can be driven.

Accordingly, the present invention can implement a backlight in which light source characteristics are selectively controlled by selectively turning on two types of light sources, such as a light source that goes straight into the pattern light guide plate and a light source that is scattered.

In addition, since the present invention can be driven by selectively switching the light source for a flat image and a light source for a stereoscopic image, the image display device can be selectively converted to a security function, a power saving function, a 3D function, and a general mode.

The embodiments have been described above with reference to the drawings, but the present invention is not limited thereto.

The terms such as "include", "consist of" or "have" described above mean that the corresponding component may be embedded, unless otherwise specified, and thus other components are not excluded. It should be construed as being able to further include other components. All terms, including technical or scientific terms, unless otherwise defined, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms generally used, such as terms defined in the dictionary, should be interpreted as being consistent with the meaning of the context of the related technology, and are not interpreted as ideal or excessively formal meanings unless explicitly defined in the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

120: first light source 130: light guide plate housing
140: three-dimensional light guide plate 142: concave reflective surface 144: exit surface 150: second light source
160: reflective sheet 170: pattern light guide plate
190: image panel

Claims (14)

A three-dimensional light guide plate positioned on a first light source and including a flat exit surface, a side portion perpendicular to the exit surface, and a concave reflective surface facing a corner portion of the exit surface and the side portion;
A second light source positioned to face the corner portion of the three-dimensional light guide plate;
A light guide plate housing positioned on the emission surface of the first light source and the three-dimensional light guide plate; And
Including a patterned light guide plate positioned on the three-dimensional light guide plate,
The concave reflective surface of the three-dimensional light guide plate has a concave shape. The backlight unit of claim 1, wherein the corner portion of the three-dimensional light guide plate facing the second light source has a concave shape in an inward direction. The backlight unit of claim 1, wherein the light guide plate housing has a semicircular shape. The backlight unit of claim 3, wherein the first light source, the exit surface of the three-dimensional light guide plate, and an inner surface of the light guide plate housing facing the pattern light guide plate are reflective surfaces. The backlight unit of claim 1, wherein the three-dimensional light guide plate is positioned between the first light source and a horizontal normal passing through a center of the light guide plate housing. The backlight unit of claim 1, further comprising a reflective sheet positioned between the three-dimensional light guide plate and the pattern light guide plate. The backlight unit of claim 1, wherein the first light source is located close to the emission surface of the three-dimensional light guide plate. A three-dimensional light guide plate positioned on a first light source and including a flat exit surface, a side portion perpendicular to the exit surface, and a concave reflective surface facing a corner portion of the exit surface and the side portion;
A second light source positioned to face the corner portion of the three-dimensional light guide plate;
A patterned light guide plate positioned on the three-dimensional light guide plate;
A light guide plate housing positioned on the first light source, the exit surface of the three-dimensional light guide plate, and the light incident surface of the pattern light guide plate; And
Including an image panel positioned on the pattern light guide plate,
The concave reflective surface has a concave shape so that light emitted from the second light source is reflected and goes straight toward the emission surface. The image display device of claim 8, further comprising an optical sheet positioned between the patterned light guide plate and the image panel. The image display device of claim 8, further comprising a lower cover accommodating the first light source, the second light source, the three-dimensional light guide plate, the pattern light guide plate, and the light guide plate housing. The image display device of claim 10, wherein a bottom surface of the lower cover supporting the three-dimensional light guide plate includes a bent portion for receiving the first light source. The image display device of claim 8, wherein the light incident surface of the patterned light guide plate is positioned parallel to the exit surface of the three-dimensional light guide plate. The image display device of claim 8, further comprising a reflective sheet positioned between the three-dimensional light guide plate and the pattern light guide plate. The image display device of claim 8, wherein the light guide plate housing includes the first light source, the emission surface of the three-dimensional light guide plate, and a reflective spherical surface facing the light incident surface of the patterned light guide plate.

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