KR20140017958A - Backlight unit and liquid crystal display device including the same - Google Patents

Abstract

The present invention discloses a backlight unit for a liquid crystal display device. More specifically, the present invention relates to a backlight unit and a liquid crystal display including the same to improve the hot-spot defects caused by the backlight unit using a high-brightness LED lamp as a point light source as a light source. .
The backlight unit according to an exemplary embodiment of the present invention includes at least one light source disposed corresponding to at least one side surface of the liquid crystal panel, a light guide plate having a light incident surface facing the light source, and disposed between the light source and the light guide plate. And a light compensating member for converting light incident from the light and transmitting the light to the light guide plate.
Accordingly, the present invention is provided with a separate light compensation member between the light source and the optical member to convert the LED lamp of the point light source form into a line light source or a surface light source to transfer the light to the optical member, such as hot-spot image quality There is an effect that can provide a backlight unit and a liquid crystal display device to minimize the degradation problem.

Description

BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE INCLUDING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit for a liquid crystal display device, and more particularly, to an optical member that improves a hot-spot defect caused by a backlight unit using a high brightness LED lamp as a light source as a light source, and the like. A backlight unit for a liquid crystal display device.

The liquid crystal display device uses a passive transmissive display device, and by controlling the amount of light passing through the liquid crystal layer by the refractive index anisotropy of the liquid crystal molecules interposed in the liquid crystal panel, a gray level of a desired image is displayed on the screen. Accordingly, a liquid crystal display includes a back light unit that provides light to the liquid crystal panel for displaying an image. Typically, a backlight unit is classified into two types according to the structure of a light source.

One is a direct type lamp, which is a light source located on the back of the liquid crystal panel, and emits light directly from the lower side to the panel. The other is an edge type, and the lamp is placed on the side of the liquid crystal panel. It is located in the direction of the panel by changing the direction of light through the diffusion sheet and the panel.

The above-described direct type is mainly applied to manufacturing a liquid crystal panel for a large-screen TV because the light emitted from the lamp is directly supplied to the liquid crystal panel, and can be applied to a large area panel.

On the other hand, the metering type is installed on the side of the liquid crystal panel and supplies light to the liquid crystal panel through the reflecting plate and the light guide plate, which are diffusion sheets, and thus it is difficult to apply to a large area liquid crystal panel as compared to the direct type method. This supply makes it difficult to obtain high brightness. However, there is an advantage that the thickness of the liquid crystal display module can be made thin because the backlight unit is located at the side.

In addition, as a light source of the backlight unit, fluorescent lamps such as CCFL and EEFL have been widely used. However, LED lamps using light emitting diodes (LEDs), which are semiconductor light emitting devices, have been replaced.

The above-described light emitting diode device emits light energy of various wavelengths by joining an n-type semiconductor having a large number of carriers and a p-type semiconductor having a large number of holes and applying an electrical signal thereto. Its permanent life, almost no replacement and maintenance, and high light conversion efficiency make the power consumption very low compared to other light sources, and it is suitable as a light source of a backlight unit because it can be miniaturized, thinned and light.

However, liquid crystal displays using LED lamps may cause undesired image quality problems when driving. In particular, when using LED lamps in the form of point light sources, hot spots in which luminance differences occur at specific locations on the screen may be used. -Spot) will occur

FIG. 1 is a view illustrating an example of a hot spot generated in a light metering liquid crystal display. As shown, the light metering liquid crystal display 10 includes a lamp substrate 22 having a plurality of LED lamps 21 mounted thereon. The light guide plate 41 is disposed at one end of the liquid crystal display, and the light guide plate 41 is disposed inward of the cover bottom 60.

When driving the backlight unit having such a structure, a hot-spot phenomenon in which a partial area is brighter than the other area in the entire area occurs at one end of the screen of the LCD. This hot spot is a dark area (HS) between the LED lamps 21 as the emission angle of the light l on the light emitting surface of the LED lamp 21 is limited to other areas. The darker the color, the brighter the rest.

In order to improve such a hot-spot, when a wide interval between the LED lamp 21 and the light guide plate 41 is disposed, the overall luminance is lowered, and each LED is minimized to minimize the dark area HS. When the interval between the lamps 21 is narrowly arranged, driving characteristics and lifespan deterioration may occur due to LED lamp heating. In addition, a problem of cost increase occurs with the increase in the number of lamps.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object thereof is to improve a picture quality of a liquid crystal display by solving hot spot defects generated in a backlight unit using an LED lamp as a point light source.

In order to achieve the above object, the backlight unit according to the first embodiment of the present invention, at least one light source disposed corresponding to at least one side of the liquid crystal panel; A light guide plate having a light incident surface facing the light source; And a light compensating member disposed between the light source and the light guide plate to convert the light incident from the light source into light in the form of a line light source and to transmit the light to the light guide plate.

The optical compensation member is characterized in that the long axis is a bar-shaped bar is arranged in parallel with at least one side of the light guide plate.

The light source may be disposed to face at least one side of the light compensating member.

The optical compensation member is characterized in that a plurality of dot patterns are formed on the surface.

The dot pattern is characterized in that its density increases as it moves away from an adjacent portion of the light source.

The light compensating member may be made of the same material as that of the light guide plate, PMMA, glass, polycarbonate (PC), methyl methacrylate styrene (MS), or a material having high heat resistance.

The light compensation member may have a cylindrical shape in which a long axis is disposed in parallel with at least one side surface of the light guide plate.

The optical compensation member is an optical fiber cable.

The light source and the light compensating member may be in close contact with each other.

A filler is interposed between the light source and the light compensating member.

The filler is characterized in that the material having a refractive characteristic between the refractive index of the light source and the light guide plate.

In order to achieve the above object, a liquid crystal display device according to a first embodiment of the present invention, a liquid crystal panel; At least one light source disposed to correspond to at least one side of the liquid crystal panel, a light guide plate disposed to face the light source, and a light guide plate disposed between the light source and the light guide plate to form incident light from the light source. A backlight unit including a light compensation member converting the light into the light guide plate and transmitting the light to the light guide plate; And a mechanical structure for coupling the liquid crystal panel and the backlight unit.

In order to achieve the above object, a backlight unit according to a second embodiment of the present invention, a plurality of light sources disposed on the rear of the liquid crystal panel; A diffusion plate disposed between the liquid crystal panel and the light source; And a plurality of light compensating members formed on a rear surface of the diffuser plate and disposed at a position corresponding to the light emitting surface of the light source to convert light incident from the light source into linear light source-type light to be transmitted to the diffuser plate. do.

The optical compensation member is characterized in that the long axis is a plurality of straight rods arranged side by side in the first direction or the second direction.

In order to achieve the above object, a liquid crystal display device according to a second embodiment of the present invention, a plurality of light sources disposed on the rear of the liquid crystal panel, a diffusion plate disposed between the liquid crystal panel and the light source, A backlight unit formed on a rear surface of the diffuser plate and disposed at a position corresponding to the light emitting surface of the light source, the backlight unit including a plurality of light compensating members for converting light incident from the light source into linear light sources and transmitting the light to the diffuser plate ; And a mechanism structure for coupling and fixing the liquid crystal panel and the backlight unit.

According to an embodiment of the present invention, by providing a separate light compensation member between the light source and the optical member by converting the point light source type LED lamp into a linear light source to transfer the light to the optical member, to minimize the hot-spot phenomenon There is an effect that it is possible to provide a backlight unit and a liquid crystal display device having improved image quality.

FIG. 1 is a diagram illustrating an example of a hot spot generated in a photometric liquid crystal display.
2A is an exploded perspective view illustrating a structure of a backlight unit and a liquid crystal display including the same according to an exemplary embodiment of the present invention.
FIG. 2B is a view illustrating some structures of the light compensation structure of the backlight unit of FIG. 2A.
2C is a view showing light distribution of the backlight unit according to the conventional and the embodiment of the present invention.
3A to 3D are views showing the arrangement of the LED lamp and the light compensation member of the backlight unit of the present invention.
4A and 4B illustrate a backlight unit according to various embodiments of the present disclosure.
5 is a view illustrating a backlight unit and a liquid crystal display including the same according to a second embodiment of the present invention.
6A and 6B are perspective and plan views of the diffuser plate and the light compensating member of the backlight unit of FIG. 5.

Hereinafter, a backlight unit and a liquid crystal display including the same according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

The drawings referred to with respect to the embodiments of the present specification are not intended to limit the shapes and positions of the components to the illustrated forms, and in particular, in order to help the understanding of structures and shapes which are technical features of the present invention, some components The scale of is exaggerated or reduced.

FIG. 2A is an exploded perspective view illustrating a structure of a backlight unit and a liquid crystal display including the same according to an exemplary embodiment of the present invention, and FIG. 2B is a diagram illustrating a partial structure of an optical compensation structure of the backlight unit of FIG. 2A. In addition, 2c is a view showing the light distribution of the backlight unit according to the prior art and the embodiment of the present invention.

As shown, the liquid crystal display device 100 of the present invention includes a liquid crystal panel 110 and a backlight unit 120, which are coupled by the instrument structure 150.

The liquid crystal panel 110 is bonded to the first substrate and the second substrate by a predetermined distance, and the liquid crystal layer is interposed therebetween. The driver substrate 115 is electrically connected to the side end of the liquid crystal panel 100, and as a signal is applied thereto, an image is realized.

The above-described first substrate is formed with a thin film transistor, various wirings and pixel electrodes electrically connected thereto. On the second substrate, a color filter and a black matrix BM for displaying RGB color are formed. The driver substrate 115 may be mounted with a gate driver for supplying a scan signal for driving the above-described thin film transistor and a data driver for supplying a data signal to the pixel electrode.

In addition, the first polarizing plate and the second polarizing plate are attached to the outside of the above-described first and second substrates, respectively, to realize an image by polarizing light incident and outputted to the liquid crystal panel 110.

The liquid crystal panel 110 is seated inside the guide panel 151 of the mechanical structure 150, and the top case 153 is coupled to the upper part 153 to be supported and fixed.

The backlight unit 120 includes at least one LED lamp 121a and 121b, lamp substrates 122a and 122b to which the LED lamps 121a and 121b are bonded, and both end surfaces thereof emit light from the LED lamps 121a and 121b. A plurality of sheets including a light compensating member 130 disposed to face the light, a lamp housing 125 into which the light compensating member 130 and the LED lamps 121a and 121b are inserted, and a light guide plate 141. The sheet 140 may be used. As the LED lamps 121a and 121b, an LED lamp including an LED element emitting white light may be used, and a lamp using a high intensity discharge (HID) lamp or a laser diode. It is preferable that a high brightness lamp such as

In the drawing, examples of the LED lamps 121a and 121b that emit one white light are shown. However, one R, G, and B LED lamp that emits monochromatic light of each of R (Red), G (Green), and B (Blue) A structure arranged in the end surface of each optical compensation member 130 forming a group of may be applied.

When the LED lamps 121a and 121b for emitting monochromatic light are used, at least one monochromatic LED lamp of R, G and B is disposed on each lamp substrate 122a and 122b, and the monochromatic light emitted therefrom is mixed into white light. To be provided to the optical compensation member 130.

Each of the lamp substrates 122a and 122b is disposed in a direction in which the LED lamps 121a and 121b mounted at corners of the mechanism structure 150 to be described later face each other.

The lamp housing 125 is disposed so that the opening faces the light guide plate 141, and the LED lamps 121a and 121b and the light compensation member 130, which will be described later, are mounted inward to be adjacent to the light incident surface of the light guide plate 141. Is placed. The lamp housing 125 is made of metal so that the light emitted from the LED lamps 121a and 121b can be efficiently incident on the light guide plate 141 and the heat generated from the lamps 121a and 121b can be easily released. Can be configured.

The light compensation member 130 is disposed such that both sides thereof face the light emitting surfaces of the two LED lamps 121a and 121b, and at least one side thereof faces the light incident surface of the light guide plate 141 in the vertical direction. The optical compensation member 130 may be made of PMMA, glass, polycarbonate (PC), MS (methyl methacrylate styrene), or the same material as the light guide plate 141 or a material having high heat resistance, and has a long axis of the light guide plate 141. It is a rod-shaped optical member which is arranged in parallel with the light incident surface. On both sides, the light of the point light source incident from the LED lamps 121a and 121b is converted into a line light source and transmitted to the light guide plate 141. 2A illustrates an example in which LED lamps 121a and 121b are disposed on both side surfaces of the light compensation member 130, but only one lamp 121a is provided on one side of the light compensation member 130 according to luminance. Alternatively, or two or more light compensation members 130 may be provided in the form.

In addition, although not shown, a filler (not shown) may be further interposed between the LED lamps 121a and 121b and the light compensating member 130 to increase light efficiency. The distance between the light emitting surfaces of the LED lamps 121a and 121b and the light compensation member 130 is about 0.2 mm to 0.3 mm, and the refractive index of the LED lamps 121a and 121b and the light compensation member 130 The intervening filler having refractive characteristics between the refractive indices can minimize the amount of light emitted to the outside by refraction, and the filler can provide the refractive index of the encapsulant and the light compensating member forming the light emitting surfaces of the LED lamps 121a and 121b. A material having a value between the refractive indices of PMMA, glass, or any of the other materials that comprise 130 can be used.

Referring to FIG. 2B, the light compensating member 130 is disposed at one side of the cover bottom 156 of the liquid crystal display so that the long axis is parallel to the incident surface of the light guide plate 141, and one end surface thereof is an LED lamp 121a. ) And the lamp substrate 122a are disposed to face each other. According to this structure, the light emitted from the LED lamp 121a proceeds along the long axis of the light compensation member 130 to form a linear light source, and the linear light source L is formed on the front surface of the light guide plate 141. It will be incident uniformly over.

Figure 2c is a view showing the shape of the light in the backlight unit using the LED lamp according to the prior art and the embodiment of the present invention, as shown, in the conventional metering type liquid crystal display device LED in the form of a predetermined distance point light source in the X-axis direction By the lamps 21, the light emitting surface of each of the LED lamps 21 is formed to spread in the Y-axis direction, it can be seen that the hot spot (HS) phenomenon appears in the dark area between the LED lamps 21. have.

On the other hand, in the liquid crystal display device of the present invention, light that is disposed to face the light emitting surface of the LED lamp 121 and spreads in the Y-axis direction by the light compensation member 130 having a long axis in the X-axis direction has a straight rod shape. It can be seen that it does not occur and spread out in a uniform form in the entire region P.

A more detailed description of the structure and arrangement of the optical compensation member 130 will be described later.

On the other hand, the light guide plate 141 serves to guide the light emitted from the LED lamps 121a and 121b and converted by the light compensation member 130 in the direction of the liquid crystal panel 100 without possible loss. In detail, the light emitted from each of the LED lamps 121a and 121b is incident on the side surface of the light guide plate 141, repeats the refraction and reflection by the diffusion agent added to the inside, and proceeds to the other side, and then the top of the light guide plate 141. It will exit to the back of the diffusion sheet.

The diffusion sheet 142 serves to diffuse the light incident from the lower light guide plate 141 so as not to be concentrated in a specific area.

The prism sheet 143 includes a first prism sheet in which a prism pattern is formed in the x-axis direction and a second prism sheet in which a prism pattern is formed in a direction orthogonal to the x-axis, and the diffusion sheet 142 in the x and y axis directions. It serves to improve the straightness of the light passing through.

The reflector 145 is provided under the light guide plate 141 to reflect the light exiting in the lower direction of the light guide plate 141 to the upper direction of the light guide plate 141. Do it.

The liquid crystal panel 110 and the backlight unit 140 described above are modularized by the instrument structure 150 described later, and the instrument structure 150 includes at least the guide panel 151, the top case 153, and the cover bottom 156. It includes.

The guide panel 151 is a mold having a rectangular frame having a step in the inward direction. The liquid crystal panel 110 is seated on the top of the step, and the backlight unit 140 is disposed on the bottom of the step.

The top case 153 is fastened to an upper portion of the guide panel 151 on which the liquid crystal panel 110 is seated, and rims each corner of the guide panel 151 and the cover bottom 156 to stabilize the liquid crystal display device 100. To fix it.

The cover bottom 156 may mount the guide panel 151 and the backlight unit 140 on which the liquid crystal panel 110 is mounted in an internal space, and may be formed of a metal material for a heat dissipation function.

By the mechanism structure, the liquid crystal display 100 includes the light guide plate 141, the diffusion sheet 142, and the prism sheet 143 of the backlight unit 140 sequentially received in the cover bottom 156, and the guide panel 151. The top panel 153 is coupled to the liquid crystal panel 100, and the cover bottom 156 and the guide panel 151 are modularized.

Accordingly, in the liquid crystal display device including the backlight unit according to the embodiment of the present invention, light incident on the light guide plate is converted into a linear light source through a light compensation member provided between the LED lamp and the light guide plate, which are point light sources, thereby causing a hot spot defect. Will be minimized.

Hereinafter, various examples in which the optical compensation member is disposed in the backlight unit according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

3A to 3D are views showing the arrangement of the LED lamp and the light compensation member of the backlight unit of the present invention.

3A shows a 1-metered liquid crystal display device using one LED lamp. Referring to the drawings, one light compensating member 130 is provided as an incident surface of the light guide plate 141, and the LED lamp 121 is provided on at least one side surface in the long axis direction of the light compensating member 130. .

In this case, the light emitted from the LED lamp 121 proceeds from one side of the light compensating member 130 to the other side and is emitted in the direction of the light guide plate 141. Accordingly, the LED lamp 121 is emitted from the light compensating member 130. The portion adjacent to and becomes relatively higher in brightness than the opposite portion. In order to compensate for the luminance deviation, a predetermined dot pattern 135 may be formed on the surface of the light compensating member 130, and serves to increase luminance by scattering and reflecting light passing therethrough. Therefore, the density of the dot pattern 135 is formed to be lower as it is closer to the LED lamp 121, and higher as it is farther away.

3b shows a one-photometric liquid crystal display using two LED lamps. Referring to FIG. 3B, one light compensating member 130 is provided as an incident surface of the light guide plate 141, and two LED lamps 121a and 121b are provided at both sides in the long axis direction of the light compensating member 130. Structure. This structure can compensate for the lack of brightness with a single LED lamp.

At this time, the light emitted from the LED lamps 121a and 121b travels from both side ends of the light compensation member 130 to the center and is emitted in the direction of the light guide plate 141. In the center part, luminance deviation occurs. In order to compensate for the luminance deviation, the dot pattern 135 formed on the surface of the light compensation member 130 may have a low density at both sides and a high density toward the center.

3C shows a two-photometric liquid crystal display using four LED lamps. Referring to FIG. 3C, light compensation members 130a and 130b are provided at both sides of the light guide plate 141, respectively, and the first light compensation member 130a and two are disposed on the first side in the long axis direction of the light compensation member 130. LED lamps 121a and 121b, a second light compensation member 130b and two LED lamps 121c and 121d on the second side.

In this structure, the dot pattern 135 formed on the surface of each of the light compensation members 130a and 130b to compensate for the luminance deviation between both end portions and the center portion of the first and second light compensation members 130a and 130b is formed. The lower the density on both sides, the higher the density toward the center can be formed in a form.

FIG. 3D shows a four-meter type liquid crystal display device using two LED lamps for each optical compensation member. Referring to FIG. 3D, light compensation members 130a to 130d are provided on all sides of the light guide plate 141, and two LED lamps 121a to 121h are provided to each side of each light compensation member.

Such a structure also includes a dot pattern 135 having a low density at both sides and a higher density toward the center portion to compensate for luminance deviations at both end portions and the center portion for each of the optical compensation members 130a to 130d. Can be.

In the above-described embodiment, the optical compensation member of the backlight unit is an example having a flat bar-shaped structure having a square cross section, but the present invention is not limited thereto. The optical compensation has a circular cylindrical structure having a circular cross section like an optical fiber cable. A member can also be used.

Hereinafter, a backlight unit using another type of optical compensation member of the present invention will be described with reference to the accompanying drawings.

4A and 4B are diagrams illustrating a backlight unit according to another embodiment of the present invention.

Referring to FIG. 4A, a backlight unit according to another embodiment of the present invention uses an optical fiber cable as the optical compensation member 230, and enters an entrance surface adjacent to the light guide plate 141 in a longitudinal direction. Are arranged to be parallel. One or both end surfaces of the light compensation member 230 are disposed to face the LED lamp 121 and the lamp substrate 122. According to this structure, the light emitted from the LED lamp 121 is guided along the longitudinal direction of the light compensation member 130 to form a line light source, the light of the line light source form uniform across the entire incident surface of the light guide plate 141. Will be incident.

In addition, although not shown overall, the brightness is low, as shown in FIG. 3b described above may further include a LED lamp on the other side of the optical compensation member 230 to compensate for the lack of brightness.

In addition, 4b is an example of implementing the four-sided light-emitting liquid crystal display device using one optical fiber cable, the optical compensation member 330 in a form surrounding the side of the light guide plate 141. The light emitted from the LED lamp 121 is guided along the longitudinal direction of the light compensation member 330 to form a line light source, and the light of the line light source form is uniformly incident on the entire side surface of the light guide plate 141.

Hereinafter, a backlight unit of the present invention and a liquid crystal display including the same according to the second embodiment of the present invention will be described with reference to the drawings.

5 is a view illustrating a backlight unit and a liquid crystal display including the liquid crystal display device according to the second embodiment of the present invention. FIGS. 6A and 6B are perspective views and plan views of a diffuser plate and an optical compensation member of the backlight unit of FIG. 5. Cotton.

As shown, the liquid crystal display of the present invention includes a liquid crystal panel 510 for displaying an image, a backlight unit including a plurality of LED lamps 521 as light sources, a guide panel 551 for modularizing the same, and the like. It consists of a mechanical structure.

The liquid crystal panel 510 is bonded to the first substrate 511 and the second substrate 512 by a predetermined distance, and a liquid crystal layer is interposed therebetween. Although not shown, a driver substrate (not shown) is electrically connected to the side end of the liquid crystal panel 510, and as a signal is applied thereto, an image is realized.

The two substrates 511 and 512 configured as described above are joined to face each other by sealants formed on the outer side of the display area to form the liquid crystal panel 510. In addition, polarizers (not shown) By being attached, the light incident on the liquid crystal panel 500 and passed through the liquid crystal layer is polarized to implement an image.

The backlight unit includes a plurality of LED lamps 521, a lamp substrate 522 to which the LED lamps 521 are bonded, an optical compensation member 530 disposed to face the light emitting surface of each LED lamp 521, and The diffusion plate 542 includes the light compensation member 530, and a prism sheet 543 disposed on the diffusion plate.

As the LED lamp 521, an LED lamp having an LED element emitting white light may be used, and a high brightness lamp such as a lamp using a high intensity discharge (HID) lamp or a laser diode is preferably used. Do. In addition, the LED lamp 521 is bonded in the first and second directions to the lamp substrate 522 composed of a conventional printed circuit board (PCB).

The plurality of light compensation members 530 extend in a first direction or a second direction to correspond to each lamp 521. The light compensating member 530 may be made of PMMA, glass polycarbonate (PC), or MS (methyl methacrylate styrene). The light compensating member 530 may be light of a point light source incident from the LED lamp 521 in a downward direction. Is converted into a linear light source form and transmitted to the upper diffusion plate 542.

6A and 6B, a plurality of light compensation members 530 are disposed on the rear surface of the diffusion plate 542 so as to extend in a first direction so as to be parallel to each other, and the light compensation members 530 are disposed below the LEDs. It is arrange | positioned so that it may overlap with the lamp 521 line by line.

According to this structure, the light emitted from each LED lamp 521 proceeds along the long axis of the light compensating member 530 to form a line light source, and the light of the line light source form is formed on the front surface of the incident surface of the diffuser plate 542. Uniform incidence over time.

The diffusion plate 542 serves to diffuse the light incident from the light compensating member 530 formed at the bottom so that it is not concentrated in a specific area.

The prism sheet 543 may be composed of a first prism sheet in which a prism pattern is formed in the x-axis direction and a second prism sheet in which the prism pattern is formed in a direction orthogonal to the x-axis. 542) to improve the straightness of the light passing through. Although not shown, a reflective sheet (not shown) may be further disposed between the LED lamps 521 on the upper surface of the lamp substrate 522.

The liquid crystal display device having such a structure is modularized by an instrument structure described later, and the instrument structure includes at least a guide panel 551, a top case 553, and a cover bottom 556.

The guide panel 551 is a mold in the form of a rectangular frame having a step in the inward direction. The liquid crystal panel 510 is seated on the top of the step, and the backlight unit 540 is disposed on the bottom of the step.

The top case 553 is fastened to the upper part of the guide panel 551 on which the liquid crystal panel 510 is seated, and the edges of the guide panel 551 and the cover bottom 556 are rimmed to stabilize the liquid crystal display 500. To fix it.

The cover bottom 556 mounts the guide panel 551 and the backlight unit 540 on which the liquid crystal panel 510 is mounted in an internal space.

With this mechanism structure, the liquid crystal display device receives the diffusion plate 542 and the prism sheet 543 of the backlight unit sequentially in the cover bottom 556, and the liquid crystal panel 510 is seated on the guide panel 551. The top case 553 is coupled to the upper portion thereof, and the cover bottom 156 and the guide panel 151 are coupled to each other to be modularized.

Accordingly, in the liquid crystal display including the backlight unit according to the second exemplary embodiment of the present invention, light incident on the light guide plate is converted into a linear light source through a light compensation member provided between the LED lamp which is a point light source and the diffusion plate. Spot defects are minimized.

Many details are set forth in the foregoing description but should be construed as illustrative of preferred embodiments rather than to limit the scope of the invention. Therefore, the invention should not be construed as limited to the embodiments described, but should be determined by equivalents to the appended claims and the claims.

100 liquid crystal display device 110 liquid crystal panel
115: driver substrate 120: backlight unit
121a, 121b: LED lamp 122a, 122b: Lamp substrate
125: lamp housing 130: light diffusion member
140: backlight unit 141: light guide plate
142: diffusion sheet 143: prism sheet
145: reflector 150: instrument structure
151: guide panel 153: top case
156: cover bottom

Claims (15)

At least one light source disposed corresponding to at least one side of the liquid crystal panel;
A light guide plate having a light incident surface facing the light source; And
A light compensating member disposed between the light source and the light guide plate to convert light incident from the light source into light in the form of a line light source and to transmit the light to the light guide plate
. The method of claim 1,
The light compensation member is a backlight unit, characterized in that the long axis is a bar-shaped bar arranged in parallel with at least one side of the light guide plate. 3. The method of claim 2,
The light source is a backlight unit, characterized in that disposed to face at least one side of the light compensation member. The method of claim 1,
The optical compensation member, the backlight unit, characterized in that a plurality of dot patterns are formed on the surface. 5. The method of claim 4,
And the dot pattern increases in density as it moves away from an adjacent portion of the light source. The method of claim 1,
The light compensating member may be made of the same material as that of the light guide plate, PMMA, glass, polycarbonate (PC), methyl methacrylate styrene (MS), or a material having high heat resistance. The method of claim 1,
The light compensation member is a backlight unit, characterized in that the long axis is a cylindrical disposed side by side with at least one side of the light guide plate. The method of claim 7, wherein
The optical compensation member is a backlight unit, characterized in that an optical fiber cable. The method of claim 1,
And the light source and the light compensating member are in close contact with each other. The method of claim 1,
The backlight unit, characterized in that the filler is interposed between the light source and the light compensation member. 11. The method of claim 10,
The filler is a backlight unit, characterized in that the material having a refractive characteristic between the refractive index of the light source and the light guide plate. A liquid crystal panel;
At least one light source disposed to correspond to at least one side of the liquid crystal panel, a light guide plate disposed to face the light source, and a light guide plate disposed between the light source and the light guide plate to form incident light from the light source. A backlight unit including a light compensation member converting the light into a light guide plate and transmitting the converted light to the light guide plate; And
Instrument structure combining the liquid crystal panel and the backlight unit
And the liquid crystal display device. A plurality of light sources disposed at a rear side of the liquid crystal panel;
A diffusion plate disposed between the liquid crystal panel and the light source; And
A plurality of light compensation members are formed on the rear surface of the diffusion plate and disposed at a position corresponding to the light emitting surface of the light source to convert light incident from the light source into linear light source-type light and transmit the light to the diffusion plate.
. The method of claim 13,
The light compensation member is a backlight unit, characterized in that a plurality of straight rods are arranged long side by side in the first direction or the second direction. A liquid crystal panel;
A plurality of light sources disposed on a rear surface of the liquid crystal panel, a diffuser plate disposed between the liquid crystal panel and the light source, and formed on a rear surface of the diffuser plate and disposed at a position corresponding to the light emitting surface of the light source, A backlight unit including a plurality of light compensating members for converting incident light into linear light source-type light and transmitting the light to the diffuser plate; And
Instrument structure for coupling and fixing the liquid crystal panel and the backlight unit
And the liquid crystal display device.

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