KR102496167B1 - Light emitting diode assembly and liquid crystal display device including the same - Google Patents

Abstract

According to the present invention, the light-emitting surfaces of the first LED and the second LED are formed in a parallelogram shape, and the upper and lower sides of the light-emitting surfaces of adjacent LEDs are overlapped and disposed on the PCB.
In addition, the first LED and the second LED have different light emitting surfaces, such as isosceles triangles or inverted isosceles triangles, and the base of the light emitting surface of the first LED and the base of the light emitting surface of the second LED are alternately arranged to overlap. will have
In addition, the first LED and the second LED have different light emitting surfaces, inverse isosceles trapezoidal or isosceles trapezoidal shapes, and the upper side of the light emitting surface of the first LED and the lower side of the light emitting surface of the second LED are alternately overlapped. have a configuration that
Accordingly, it is possible to effectively implement a narrow bezel of the liquid crystal display device by preventing a dark portion generated in the light incident portion of the light guide plate.

Description

Light emitting diode assembly and a liquid crystal display device including the same

The present invention relates to a light emitting diode assembly and a liquid crystal display device including the same, and more particularly, to a light emitting diode assembly capable of effectively implementing a narrow bezel and a liquid crystal display device including the same.

The liquid crystal display device (LCD), which is advantageous for displaying moving images and has a large contrast ratio, is actively used in TVs and monitors. It shows the principle of image realization by .

Such a liquid crystal display device has as an essential component a liquid crystal panel bonded by interposing a liquid crystal layer between two parallel substrates, and realizes a difference in transmittance by changing the arrangement direction of liquid crystal molecules with an electric field in the liquid crystal panel. do.

However, since the liquid crystal panel does not have a self-luminous element, a separate light source is required to display the difference in transmittance as an image.

Here, Cold Cathode Fluorescent Lamp (CCFL), External Electrode Fluorescent Lamp, and Light Emitting Diode (LED, hereinafter referred to as LED) are used as light sources of the backlight unit. .

Among them, in particular, the LED is a trend that is widely used as a light source for display by combining features such as small size, low power consumption, and high reliability.

1 is a cross-sectional view of a conventional liquid crystal display device.

As shown in FIG. 1, the liquid crystal display device 1 using LED as a light source includes a liquid crystal panel 10, a backlight unit 20, a guide panel 30, a cover bottom 50, and a case top 40. It consists of

The liquid crystal panel 10 is a part that plays a key role in image expression, and is composed of first and second substrates 12 and 14 bonded face to face with a liquid crystal layer (not shown) therebetween.

A backlight unit 20 is provided behind the liquid crystal panel 10 .

The backlight unit 20 includes an LED assembly 29 arranged along the longitudinal direction of at least one edge of the guide panel 30, a white or silver reflector 25 seated on the cover bottom 50, and such a reflector ( 25) a light guide plate 23 seated on the light guide plate and a plurality of optical sheets 21 interposed thereon.

At this time, the LED assembly 29 is configured on one side of the light guide plate 23, a plurality of LEDs 29a emitting white light, and an LED printed circuit board 29b (hereinafter referred to as PCB) on which the LEDs 29a are mounted. referred to as). In addition, this PCB (29b) is attached to the rear surface of the PCB (29b) with an insulating layer 27 interposed therebetween to emit heat emitted from the LED (29a) to the outside and extends to the bottom and is made of a metal LED. A housing 28 is provided.

The liquid crystal panel 10 and the backlight unit 20 have a case top 40 that surrounds the upper edge of the liquid crystal panel 10 and the rear surface of the backlight unit 20 in a state where the edge is surrounded by a rectangular guide panel 30. The cover bottom 50 covering the is coupled from the front and rear, respectively, and is integrated through the guide panel 30.

Polarizers 19a and 19b for controlling the polarization direction of light are respectively attached to the front and rear surfaces of the liquid crystal panel 10 .

On the other hand, the position of the LED assembly 29 should be fixed by adhesive or the like so that the light emitted from the plurality of LEDs 29a faces the light incident surface of the light guide plate 23 .

Thus, in the light guide plate 23 , the light incident from the LED 29a is totally reflected and continues to proceed. As a result, the light is evenly diffused inside the light guide plate 23 to provide a surface light source to the liquid crystal panel 10 .

Recently, in manufacturing a liquid crystal display device, it is required to form the display area AA of the liquid crystal display device to the maximum and form the non-display area NA (bezel portion) as small as possible.

Hereinafter, an increase in the width of a bezel due to a dark part phenomenon of a light incident part of a light guide plate in a conventional liquid crystal display device will be described with reference to drawings.

2A and 2B are diagrams referenced to explain a change in width of a bezel part according to occurrence of a dark part in a conventional liquid crystal display device.

As shown, the LED 29a may emit light having red (R), green (G), and blue (B) colors toward the light incident surface of the light guide plate 23, respectively. If they are turned on at once, white light can be realized by color mixing.

On the other hand, since the LED 29a is mounted on the PCB 29b with a certain separation distance C in the process, most of the light emitted from the LED 29a goes forward and the light going out in the side direction is relatively small, the LED The light emitted from (29a) is non-uniformly supplied to the light incident surface of the light guide plate (23), which causes a dark dark area (BA) to occur at the separation distance (C) between the LEDs (29a), resulting in uneven luminance. there is

Accordingly, the conventional liquid crystal display device 1 determines an area where the light emitted from the LED 29a is incident into the light guide plate 23 and sufficiently mixed, and covers the area. Bezel) is set.

That is, the optical distance defined as the distance from the light incident surface of the light guide plate 23 to the display area AA is maintained by ?L1? so that the dark portion BA does not occur in the display area AA.

However, with the recent implementation of a narrow bezel in a liquid crystal display, the optical distance from the light incident surface of the light guide plate 23 to the display area AA tends to be gradually narrowed.

If, as shown in FIG. 2B, the distance from the light incident surface of the light guide plate 23 to the display area AA is 'L2', the dark area BA phenomenon occurs in the display area AA.

Therefore, in the conventional liquid crystal display device 1, the distance L1 from the light-incident surface of the light guide plate 23 to the display area AA is fixed to prevent the occurrence of the dark area BA from occurring in the display area AA. Since it is necessary to maintain a distance, there is a problem in implementing a narrow bezel.

An object of the present invention is to provide an LED assembly with improved dark part phenomenon and a liquid crystal display device including the same.

In order to achieve the above object, the present invention includes a backlight unit disposed under the liquid crystal panel, the backlight unit is spaced apart and alternately arranged first LED and second LED, the first An LED assembly including a PCB on which an LED and a second LED are mounted, and a light emitting surface of each of the first LED and the second LED is a parallelogram having an acute angle and an obtuse angle.

On the other hand, the present invention includes a backlight unit disposed under the liquid crystal panel, wherein the backlight unit includes first LEDs and second LEDs spaced apart and alternately disposed, and the first LED and the second LED are mounted. A liquid crystal display comprising an LED assembly including a PCB, wherein a light emitting surface of the first LED is an inverted trapezoidal shape having an acute angle and an obtuse angle, and a light emitting surface of the second LED is an isosceles trapezoidal shape having the acute angle and the obtuse angle. provides

On the other hand, the present invention includes a backlight unit disposed under the liquid crystal panel, the backlight unit includes a first LED and a second LED spaced apart from each other, and a PCB on which the first LED and the second LED are mounted. A light emitting surface of the first LED is an isosceles triangle, and a light emitting surface of the second LED is an inverted isosceles triangle.

Here, an upper side of the light emitting surface of the first LED and a lower side of the light emitting surface of the second LED may overlap.

In addition, the bottom of the light emitting surface of the first LED and the bottom of the light emitting surface of the second LED may overlap.

In addition, each of the first LED and the second LED includes a rear surface opposite to the light emitting surface, and an upper surface, a lower surface, a first side surface, and a second side surface connecting the light emitting surface and the rear surface. Light may be output through the surface, the first side surface, and the second side surface.

Here, each of the first LED and the second LED includes a rear surface opposite to the light emitting surface, a bottom surface connecting the light emitting surface and the rear surface, a first inclined surface, and a second inclined surface, and Light may be output through the first inclined plane and the second inclined plane.

In addition, the acute angle may be 20 ° to 45 °.

And, the base angle of the first LED and the second LED may be 20 ° to 45 °.

On the other hand, the present invention includes a PCB and a first LED and a second LED spaced apart from the PCB and alternately disposed, and the light emitting surface of each of the first LED and the second LED is a parallelogram having an acute angle and an obtuse angle. provides

On the other hand, the present invention includes a PCB and a first LED and a second LED spaced apart from the PCB and alternately disposed, the light emitting surface of the first LED is an isosceles trapezoid having an acute angle and an obtuse angle, and the second LED The light emitting surface is in the shape of an inverted trapezoid having the acute angle and the obtuse angle.

On the other hand, the present invention includes a PCB and a first LED and a second LED alternately arranged spaced apart from the PCB, wherein the light emitting surface of the first LED is an isosceles triangle, and the light emitting surface of the second LED is an inverted isosceles triangle. We provide LED assemblies.

Here, an upper side of the light emitting surface of the first LED and a lower side of the light emitting surface of the second LED may overlap.

In addition, the bottom of the light emitting surface of the first LED and the bottom of the light emitting surface of the second LED may overlap.

In addition, each of the first LED and the second LED includes a rear surface opposite to the light emitting surface, and an upper surface, a lower surface, a first side surface, and a second side surface connecting the light emitting surface and the rear surface. Light may be output through the surface, the first side surface, and the second side surface.

In addition, each of the first LED and the second LED includes a rear surface opposite to the light emitting surface, a bottom surface connecting the light emitting surface and the rear surface, a first inclined surface, and a second inclined surface, and the light emitting surface and Light may be output through the first inclined plane and the second inclined plane.

In addition, the acute angle may be 20 ° to 45 °.

And, the base angle of the first LED and the second LED may be 20 ° to 45 °.

In the present invention, the light emitting surfaces of the LEDs are formed in a parallelogram shape, and the upper and lower sides of the light emitting surfaces of the adjacent LEDs are mounted on a PCB so that the upper and lower sides overlap each other, thereby preventing dark areas from occurring at the light entrance part of the light guide plate. Accordingly, it is possible to effectively implement a narrow bezel of the liquid crystal display device.

1 is a cross-sectional view of a conventional liquid crystal display device.
2A and 2B are diagrams referenced to explain a change in width of a bezel part according to occurrence of a dark part in a conventional liquid crystal display device.
3 is an exploded perspective view schematically showing a liquid crystal display device according to a first embodiment of the present invention.
4 is a schematic cross-sectional view of a liquid crystal display device according to a first embodiment of the present invention.
5a and 5b are views schematically showing an LED assembly according to a first embodiment of the present invention.
6 is a diagram schematically showing how light is incident on the light guide plate of the liquid crystal display according to the first embodiment of the present invention.
7a and 7b are views schematically showing an LED assembly according to a second embodiment of the present invention.
8a and 8b are views schematically showing an LED assembly according to a third embodiment of the present invention.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

3 is an exploded perspective view schematically showing a liquid crystal display according to a first embodiment of the present invention, and FIG. 4 is a cross-sectional view schematically showing a liquid crystal display according to the first embodiment of the present invention.

As shown, the liquid crystal display device 100 includes a liquid crystal panel 110 and a backlight unit 120, and a guide panel 130 and a cover bottom 150 for modularizing the liquid crystal panel 110 and the backlight unit 120. , It is composed of a case top 140.

Here, for convenience of description, directions in the drawings may be defined. The direction of the display surface of the liquid crystal panel 110 is referred to as forward or upward (or upward), and the opposite direction is referred to as backward or downward (or downward). .

Looking at each of these in more detail, the liquid crystal panel 110 is a part that plays a key role in image expression, and the first substrate 112 and the second substrate 114 are bonded face to face with a liquid crystal layer interposed therebetween. includes

At this time, under the premise of an active matrix method, a plurality of gate lines and data lines intersect to define a pixel on the inner surface of the first substrate 112, which is commonly referred to as a lower substrate or an array substrate, although it is not shown on the drawing, and each A thin film transistor (TFT) is provided at each intersection of and is connected to a transparent pixel electrode formed in each pixel in a one-to-one correspondence.

And, for example, red (R), green (G), and blue (B) color filters corresponding to each pixel on the inner surface of the second substrate 114, which is called an upper substrate or a color filter substrate, and each of these A black matrix covering non-display elements such as gate lines, data lines, and thin film transistors may be provided.

At this time, all types of liquid crystal panels 110 can be used as the liquid crystal panel 110, for example, all types of liquid crystal panels 110 such as IPS type, AH-IPS type, TN type, VA type, ECB type can be used Here, when the IPS method or the AH-IPS method is used, a common electrode forming a lateral electric field together with the pixel electrode may be formed on the first substrate 112 .

In addition, an alignment film may be formed at the interface between the first and second substrates 112 and 114 and the liquid crystal layer to determine the initial molecular alignment direction of the liquid crystal, and the liquid crystal layer filled between the first and second substrates 112 and 114 may be formed. Seal patterns may be formed along the edges of the two substrates 112 and 114 to prevent leakage.

Polarizers (not shown) that selectively transmit only specific light are attached to the outer surfaces of the first and second substrates 112 and 114, respectively.

Along at least one edge of the liquid crystal panel 110, a printed circuit board 117 is connected via a connecting member 116 such as a flexible circuit board or a tape carrier package (TCP) to guide in the modularization process. The side surface of the panel 130 or the back surface of the cover bottom 150 is appropriately bent and adhered to.

In the liquid crystal panel 110, when the thin film transistors selected for each gate line are turned on by the on/off signal of the gate driving circuit, the signal voltage of the data driving circuit is transmitted to the corresponding pixel electrode through the data line. The arrangement direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode, resulting in a difference in transmittance.

In addition, the liquid crystal display device 100 according to the present invention is provided with a backlight unit 120 that supplies light from its rear surface so that the difference in transmittance indicated by the liquid crystal panel 110 is expressed to the outside.

The backlight unit 120 includes an LED assembly 129, a white or silver reflector 125, a light guide plate 123 seated on the reflector 125, and a plurality of optical sheets 121 interposed therebetween. include

The LED assembly 129 is located on one side of the light guide plate 123 to face the light incident surface of the light guide plate 123, and the LED assembly 129 includes a plurality of LEDs 129a and a plurality of LEDs 129a at regular intervals. It includes a PCB 129b mounted apart from each other.

At this time, the plurality of LEDs 129a include LED chips (not shown) emitting all RGB colors or emitting white light, and emit white light forward toward the light incident surface of the light guide plate 123 . On the other hand, the plurality of LEDs 129a emit light having colors of red (R), green (G), and blue (B), respectively, and by turning on these plurality of RGB LEDs 129a at once, white light by color mixing is produced. can also be implemented.

Here, the light emitting surface of the LED 129a of the present invention may be configured in a parallelogram shape having an acute angle and an obtuse angle.

In this case, despite the separation distance between the LEDs 129a mounted on the PCB 129b, it is possible to prevent the dark part (BA in FIG. 2B) of the light entering part of the light guide plate 123. Therefore, it is possible to effectively implement a narrow bezel by minimizing the optical distance (L1 in FIG. 2A).

Regarding the LED assembly 129 of the present invention, it will be looked at in more detail later.

In the light guide plate 123 to which light output from the plurality of LEDs 129a is incident, the light incident from the LEDs 129a spreads evenly over a wide area of the light guide plate 123 while traveling in the light guide plate 123 by several times of total reflection. A surface light source is provided to the liquid crystal panel 110 .

The light guide plate 123 may include a pattern having a specific shape on the rear surface in order to supply a uniform surface light source.

Here, the pattern may be configured in various ways, such as an elliptical pattern, a polygonal pattern, or a hologram pattern, in order to guide light incident to the inside of the light guide plate 123. The pattern may be formed on the lower surface of the light guide plate 123 by a printing method or a thermal compression method.

The reflector 125 is positioned on the rear surface of the light guide plate 123 and reflects the light passing through the rear surface of the light guide plate 123 toward the liquid crystal panel 110 to improve the luminance of light.

The plurality of optical sheets 121 on the upper part of the light guide plate 123 include a diffusion sheet and at least one light collecting sheet, etc., and diffuse or condense the light passing through the light guide plate 123 to form a more uniform surface on the liquid crystal panel 110. Let the light source enter.

The liquid crystal panel 110 and the backlight unit 120 are modularized through a case top 140, a guide panel 130, and a cover bottom 150, and the case top 140 is the top and side surfaces of the liquid crystal panel 110. It may be configured to display an image implemented in the liquid crystal panel 110 by opening the front surface of the case top 140 in a square frame shape with a cross section bent in an “A” shape to cover the edge.

Meanwhile, the liquid crystal panel 110 may be directly attached to the guide panel 130 through an adhesive member.

That is, the liquid crystal display device 100 may be configured not to separately include the case top 140 surrounding the front edge of the liquid crystal panel 110 . In this way, when the liquid crystal panel 110 is configured to be directly exposed to the outside without the case top 140, the liquid crystal display device 100 can have a beautiful appearance and can be recognized by the user with a larger area. will have

As described above, the liquid crystal display device 100 of the first embodiment of the present invention includes an LED assembly 129 including parallelogram-shaped LEDs 129a having an acute angle and an obtuse angle on a light emitting surface, thereby providing a light guide plate ( 123), it is possible to effectively improve the dark part generated in the light entrance part.

5a and 5b are views schematically showing an LED assembly according to a first embodiment of the present invention.

As shown, the LED assembly 129 according to the first embodiment may include a first LED 129a1 and a second LED 129a2.

Each of the first LED 129a1 and the second LED 129a2 may include a parallelogram-shaped light emitting surface 161 having an acute angle θ1 and an obtuse angle θ2.

Here, the light emitting surface 161 of each of the first LED 129a1 and the second LED 129a2 may include an upper side 161a, a lower side 161b, a first side side 161c, and a second side side 161d. there is.

In particular, when the first LED 129a1 and the second LED 129a2 are disposed on the PCB 129b, the lower side 161b of the light emitting surface 161 of the first LED 129a1 along the extension direction of the PCB 129b and the upper side 161a of the light emitting surface 161 of the second LED 129a2 may overlap each other.

In this case, the second side 161d of the first LED 129a1 and the first side 161c of the second LED 129a2 may be spaced apart from each other and disposed in parallel.

That is, as shown in FIG. 5A , the lower side 161b of the light emitting surface 161 of the first LED 129a1 and the upper side 161a of the light emitting surface 161 of the second LED 129a2 vertically coincide and overlap each other. 5B, the lower side 161b of the light emitting surface 161 of the first LED 129a1 and the upper side 161a of the light emitting surface 161 of the second LED 129a2 are mutually constant. They are overlapping and can be nested.

On the other hand, each of the first LED (129a1) and the second LED (129a2) is located opposite to the light emitting surface 161 and has a rear surface in contact with the PCB (129b) and an upper surface 162 connecting the light emitting surface 161 and the rear surface. , It may include a lower surface 163, a first side surface 164, and a second side surface 165.

Here, light may be output through the light emitting surface 161 and the first side surface 164 and the second side surface 165 .

In addition, a blocking film (W) may be formed on the upper surface 162 and the lower surface 163 so that light is not output.

That is, by forming a blocking film (W) on the upper surface 162 and the lower surface 163 to block light output, it is possible to prevent light leakage from occurring at the edge of the liquid crystal display (100 in FIG. 3).

Meanwhile, the acute angle θ1 of the light emitting surface 161 of each of the first LED 129a1 and the second LED 129a2 may be 20° to 45°, but is not limited thereto, and the size of the LEDs 129a1 and 129a2 Accordingly, various angles may be included in which the lower side 161b of the light emitting surface 161 of the first LED 129a1 and the upper side 161a of the light emitting surface 161 of the second LED 129a2 may be overlapped. there is.

Accordingly, the light emitting surface 161 of the first LED 129a1 and the second LED 129a2 has a parallelogram shape, and the lower side of the light emitting surface 161 of the first LED 129a1 along the extension direction of the PCB 129b. (161b) and the upper side (161a) of the light emitting surface 161 of the second LED (129a2) are overlapped to output light at the separation distance (C) of the first LED (129a1) and the second LED (129a2). do.

Accordingly, the dark portion (BA in FIG. 2B ) of the light entering portion of the light guide plate 123 generated due to the separation distance C between the first LED 129a1 and the second LED 129a1 can be efficiently removed. Therefore, it is possible to effectively implement a narrow bezel.

6 is a diagram schematically showing how light is incident on the light guide plate of the liquid crystal display according to the first embodiment of the present invention.

As shown, each of the arranged LEDs 129a1 and 2 of the LED assembly 129 is arranged with a separation distance C in process.

The first LED 129a1 and the second LED 129a2 have a light emitting surface (161 in FIG. 5A) of a parallelogram shape, and the light emitting surface of the first LED 129a1 (161 in FIG. 5A) along the extending direction of the PCB 129b. The first LED 129a1 and the second LED ( 129a2) to output light at a separation distance (C).

Accordingly, a dark portion (BA in FIG. 2B ) is not formed in the light entering portion of the light guide plate 123 .

That is, by the separation distance (C) between the first LED (129a1) and the second LED (129a2) generated by the minimum separation distance (C) in the process of the first LED (129a1) and the second LED (129a2). The dark portion (BA in FIG. 2B) of the light entering portion of the light guide plate 123 can be efficiently removed.

As described above, in the liquid crystal display device (100 in FIG. 3) according to the first embodiment of the present invention, the light emitting surfaces (161 in FIG. 5A) of the first LED 129a1 and the second LED 129a2 are parallelograms. shape, and along the extending direction of the PCB 129b, the lower side (161b in FIG. 5A) of the light emitting surface (161 in FIG. 5A) of the first LED 129a1 and the light emitting surface (161 in FIG. 5A) of the second LED 129a2 ) constitutes a structure in which the upper side (161a in FIG. 5a) is overlapped.

Accordingly, it is possible to efficiently remove the dark part (BA in FIG. 2B) of the light entrance part of the light guide plate 123 due to the separation distance C in the process of the LEDs 129a1 and 2, so that a narrow bezel can be effectively implemented. do.

<Second Embodiment>

The liquid crystal display device according to the second embodiment of the present invention has a different shape of the first LED and the second LED from the liquid crystal display device of the first embodiment, and this will be described in more detail below. Meanwhile, for convenience of description, detailed descriptions of components identical and similar to those of the first embodiment may be omitted below.

7a and 7b are views schematically showing an LED assembly according to a second embodiment of the present invention.

As shown, the LED assembly 229 according to the second embodiment may include a first LED 229a1 and a second LED 229a2.

Each of the first LED 229a1 and the second LED 229a2 may include an isosceles triangle or a light emitting surface 261 of an inverse isosceles triangle.

In addition, the light emitting surfaces 261 of the first LED 229a1 and the second LED 229a2 have different shapes.

For example, when the light emitting surface 261 of the first LED 229a1 has the shape of an isosceles triangle, the light emitting surface 261 of the second LED 229a2 may have the shape of an inverted isosceles triangle. When the light emitting surface 261 has the shape of an inverted isosceles triangle, the light emitting surface 261 of the second LED 229a2 may have the shape of an isosceles triangle.

Here, each light emitting surface 261 of the first LED 229a1 and the second LED 229a2 may include a base 261a, a first oblique side 261b, and a second oblique side 261c.

In an isosceles triangle or an inverse isosceles triangle, two sides having the same length are defined as hypotenuses 261b and c, and a side connecting the two hypotenuses 261b and c is defined as a base 261a.

In addition, the first LED 229a1 and the second LED 229a2 may be spaced apart from each other along the extension direction of the PCB 229b and alternately arranged. For example, it may be arranged as "isosceles triangle, inverse isosceles triangle, isosceles triangle, inverse isosceles triangle...", but is not limited thereto.

In particular, when the first LED 229a1 and the second LED 229a2 are disposed on the PCB 229b, the bottom 261a of the light emitting surface 261 of the first LED 229a1 along the extension direction of the PCB 229b and the base 261a of the light emitting surface 261 of the second LED 229a2 may overlap each other.

Hereinafter, a case in which the light emitting surface 261 of the first LED 229a1 has the shape of an isosceles triangle and the light emitting surface 261 of the second LED 229a2 has the shape of an inverted isosceles triangle will be described.

Here, the base 261a of the isosceles triangle, which is the light emitting surface 261 of the first LED 229a1, and the base 261a of the inverted isosceles triangle, which is the light emitting surface 261 of the second LED 229a2, are arranged to overlap. can

In this case, the first oblique side 261b of the light emitting surface 261 of the second LED 229a2 facing the second oblique side 261c of the light emitting surface 261 of the first LED 229a1 may be disposed in parallel. there is.

That is, as shown in FIG. 7A , the base 261a of the light emitting surface 261 of the first LED 229a1 and the base 261a of the light emitting surface 261 of the second LED 229a2 are vertically aligned and overlap each other. 7B, the base 261a of the light emitting surface 261 of the first LED 229a1 and the base 261a of the light emitting surface 261 of the second LED 229a2 are mutually constant. They are overlapping and can be nested.

On the other hand, each of the first LED 229a1 and the second LED 229a2 is located opposite to the light emitting surface 261 and has a rear surface contacting the PCB 229b and a bottom surface 263 connecting the light emitting surface 261 and the rear surface. and a first inclined plane 264 and a second inclined plane 265.

Here, each of the first LED 229a1 and the second LED 229a2 may output light through the light emitting surface 261 and the first inclined plane 264 and the second inclined plane 265 .

In addition, a blocking film W may be formed on the bottom surface 263 of each of the first LED 229a1 and the second LED 229a2 to prevent light from being output.

That is, by forming a blocking film (W) on the bottom surface 263 to block light output, it is possible to prevent light leakage from occurring at the edge of the liquid crystal display (100 in FIG. 3).

Meanwhile, the base angle θ1 of the light emitting surface 261 of each of the first LED 229a1 and the second LED 229a2 may be 20° to 45°, but is not limited thereto, and the size of the LEDs 229a1 and 2 Accordingly, various angles may be included in which the base 261a of the light emitting surface 261 of the first LED 229a1 and the base 261a of the light emitting surface 261 of the second LED 229a2 may overlap each other. there is.

Therefore, the light emitting surface 261 of the first LED 229a1 has the shape of an isosceles triangle and the light emitting surface 261 of the second LED 229a2 has the shape of an inverted isosceles triangle and is spaced apart at regular intervals along the extension direction of the PCB 229b. Thus, the first LED 229a1 and the second LED 229a2 are alternately disposed.

At this time, the lower edge 261a of the light emitting surface 261 of the first LED 229a1 and the lower edge 261a of the light emitting surface 261 of the second LED 229a2 are disposed so as to overlap each other, thereby overlapping the first LED 229a1 and the second LED 229a1. Light is output at the separation distance (C) of the 2 LEDs (229a2).

Accordingly, the dark portion (BA in FIG. 2B) of the light entering portion of the light guide plate (123 in FIG. 6) generated due to the separation distance (C) between the first LED (229a1) and the second LED (229a2) in a process is efficiently removed. Since it can be removed, it is possible to effectively implement a narrow bezel.

As described above, in the liquid crystal display device (100 in FIG. 3) according to the second embodiment of the present invention, the first LED 229a1 and the second LED 229a2 are isosceles light emitting surfaces 261 having different shapes. It has a triangular or inverted isosceles triangle shape, and the first LED 229a1 and the second LED 229a2 are alternately arranged along the extension direction of the PCB 229b.

At this time, the base 261a of the light emitting surface 261 of the first LED 229a1 and the base 261a of the light emitting surface 261 of the second LED 229a2 are arranged to overlap each other.

Accordingly, it is possible to efficiently remove the dark portion (BA in FIG. 2B) of the entrance and exit of the light guide plate (123 in FIG. 6) due to the separation distance (C) in the process of the LED 229a, thereby effectively realizing a narrow bezel. there will be

<Third Embodiment>

The liquid crystal display device according to the third embodiment of the present invention has a different shape of the first LED and the second LED from the liquid crystal display device of the first embodiment, and this will be described in more detail below. Meanwhile, for convenience of description, detailed descriptions of components identical and similar to those of the first embodiment may be omitted below.

8a and 8b are views schematically showing an LED assembly according to a third embodiment of the present invention.

As shown, the LED assembly 329 according to the third embodiment may include a first LED 329a1 and a second LED 329a2.

Each of the first LED 329a1 and the second LED 329a2 may include an inverse trapezoidal or isosceles trapezoidal light emitting surface 361 having an acute angle θ1 and an obtuse angle θ2.

In addition, the light emitting surfaces 361 of the first LED 329a1 and the second LED 329a2 have different shapes.

For example, when the light emitting surface 361 of the first LED 329a1 is an inverse trapezoidal shape, the light emitting surface 361 of the second LED 329a2 may be an isosceles trapezoidal shape, and the light emitting surface of the first LED 329a1 When 361 is an isosceles trapezoid, the light emitting surface 361 of the second LED 329a2 may be an inverse trapezoid.

Here, the light emitting surface 361 of each of the first LED 329a1 and the second LED 329a2 may include a lower side 361b, an upper side 361a, a first side side 361c, and a second side side 361d. there is.

As for the upper and lower sides of the inverted trapezoid or isosceles trapezoid, the side closest to the liquid crystal panel based on the light incident surface of the light guide plate is defined as the upper side, and the side opposite to the upper side is defined as the lower side.

In addition, the first LED 329a1 and the second LED 329a2 may be spaced apart from each other along the extension direction of the PCB 329b and alternately arranged. For example, it may be arranged as "isosceles trapezoid, inverse isosceles trapezoid, isosceles trapezoid, inverse isosceles trapezoid...", but is not limited thereto.

In particular, when the first LED 329a1 and the second LED 329a2 are disposed on the PCB 329b, the upper side 361a of the light emitting surface 361 of the first LED 329a1 along the extension direction of the PCB 329b and the lower side 361b of the light emitting surface 361 of the second LED 329a2 may overlap each other.

Hereinafter, it is assumed that the light emitting surface 361 of the first LED 329a1 has an inverted trapezoidal shape and the light emitting surface 361 of the second LED 329a2 has an isosceles trapezoidal shape.

Here, the upper side 361a of the light emitting surface 361 of the first LED 329a1, which is an inverted trapezoidal shape, and the lower side 361b of the isosceles trapezoidal shape, which is the light emitting surface 361 of the second LED 329a2, overlap each other. can be placed

In this case, the first side 361c of the light emitting surface 361 of the second LED 329a2 facing the second side 361d of the light emitting surface 361 of the first LED 329a1 may be disposed in parallel. there is.

That is, as shown in FIG. 8A , the upper side 361a of the light emitting surface 361 of the first LED 329a1 and the lower side 361b of the light emitting surface 361 of the second LED 329a2 vertically coincide and overlap each other. In the case of FIG. 8B, the upper side 361a of the light emitting surface 361 of the first LED 329a1 and the lower side 361b of the light emitting surface 361 of the second LED 329a2 overlap each other in a certain area and overlap each other. can do.

On the other hand, each of the first LED (329a1) and the second LED (329a2) is positioned opposite to the light emitting surface 361 and has a rear surface contacting the PCB 329b and a lower surface 363 connecting the light emitting surface 361 and the rear surface. , It may include a top surface 362, a first side surface 364, and a second side surface 365.

Here, light may be output from each of the first LED 329a1 and the second LED 329a2 through the light emitting surface 361 and the first side surface 364 and the second side surface 365 .

And, each of the first LED 329a1 and the second LED 329a2 may form a blocking film W to prevent light from being output to the upper surface 362 and the lower surface 363 .

That is, by forming a blocking film (W) on the upper surface 362 and the lower surface 363 to block light output, it is possible to prevent light leakage from occurring at the edge of the liquid crystal display (100 in FIG. 3).

Meanwhile, an acute angle θ1 of the light emitting surface 361 of each of the first LED 329a1 and the second LED 329a2 may be 20° to 45°, but is not limited thereto, and the size of the LEDs 329a1 and 2 Accordingly, various angles may be included in which the upper side 361a of the light emitting surface 361 of the first LED 329a1 and the lower side 361b of the light emitting surface 361 of the second LED 329a2 may overlap each other. there is.

Therefore, the light emitting surface 361 of the first LED 329a1 has the shape of an inverted trapezoid and the light emitting surface 361 of the second LED 329a2 has the shape of an isosceles trapezoid, and has a predetermined distance along the extending direction of the PCB 329b. Spaced apart, the first LED 329a1 and the second LED 329a2 are alternately disposed.

At this time, by arranging the upper side 361a of the light emitting surface 361 of the first LED 329a1 and the lower side 361b of the light emitting surface 361 of the second LED 329a2 to overlap, the first LED 329a1 and Light is output at the separation distance C of the second LED 329a2.

Accordingly, it is possible to efficiently remove the dark part of the light entering part of the light guide plate (123 in FIG. 6) caused by the separation distance C between the first LED 329a1 and the second LED 329a2 in the process. The narrow bezel can be effectively implemented.

As described above, in the liquid crystal display device (100 in FIG. 3) according to the third embodiment of the present invention, the first LED 329a1 and the second LED 329a2 have different light emitting surfaces 361, i.e., an inverted trapezoidal shape. shape or isosceles trapezoidal shape, and the first LED 329a1 and the second LED 329a2 are alternately arranged along the extension direction of the PCB 329b.

At this time, the upper side 361a of the light emitting surface 361 of the first LED 329a1 and the lower side 361b of the light emitting surface 361 of the second LED 329a2 are configured to overlap each other.

Accordingly, it is possible to efficiently remove the dark part (BA in FIG. 2B) of the light entrance part of the light guide plate (123 in FIG. 6) due to the separation distance (C) in the process of the LED 329a, so that a narrow bezel can be effectively implemented. there will be

The above-described embodiment of the present invention is an example of the present invention, and free modification is possible within the scope included in the spirit of the present invention. Accordingly, this invention covers the modifications and variations of this invention within the scope of the appended claims and their equivalents.

100: liquid crystal display device 110: liquid crystal panel
112: first substrate 114: second substrate
116: connecting member 117: printed circuit board
120: backlight unit 121: optical sheet
123: light guide plate 125: reflector
129: LED assembly 129a: LED
129b: PCB 130: guide panel
140: case top 150: cover bottom

Claims (18)

liquid crystal panel;
A backlight unit disposed under the liquid crystal panel
including,
The backlight unit includes an LED assembly including spaced apart and alternately arranged first LEDs and second LEDs, and a PCB on which the first LED and the second LED are mounted,
The light emitting surface of each of the first LED and the second LED is a parallelogram having an acute angle and an obtuse angle.
liquid crystal panel;
A backlight unit disposed under the liquid crystal panel
including,
The backlight unit includes an LED assembly including spaced apart and alternately arranged first LEDs and second LEDs, and a PCB on which the first LED and the second LED are mounted,
The light emitting surface of the first LED is an inverted trapezoidal shape having an acute angle and an obtuse angle, and the light emitting surface of the second LED is an isosceles trapezoidal shape having the acute angle and the obtuse angle.
liquid crystal panel;
A backlight unit disposed under the liquid crystal panel
including,
The backlight unit includes a first LED and a second LED spaced apart from each other, and an LED assembly including a PCB on which the first LED and the second LED are mounted,
The light emitting surface of the first LED is an isosceles triangle, and the light emitting surface of the second LED is an inverted isosceles triangle.
According to claim 1 or 2,
An upper side of the light emitting surface of the first LED overlaps with a lower side of the light emitting surface of the second LED.
According to claim 3,
A liquid crystal display device in which a lower edge of a light emitting surface of the first LED overlaps with a lower edge of a light emitting surface of the second LED.
According to claim 1 or 2,
Each of the first LED and the second LED includes a rear surface opposite to the light emitting surface, and an upper surface, a lower surface, a first side surface, and a second side surface connecting the light emitting surface and the rear surface,
A liquid crystal display device in which light is output through the light emitting surface, the first side surface, and the second side surface.
According to claim 3,
Each of the first LED and the second LED includes a rear surface opposite to the light emitting surface, a bottom surface connecting the light emitting surface and the rear surface, a first inclined surface, and a second inclined surface,
A liquid crystal display device in which light is output through the light emitting surface, the first inclined plane, and the second inclined plane.
According to claim 1 or 2,
The acute angle is a liquid crystal display device of 20 ° to 45 °.
According to claim 3,
The base angle of the first LED and the second LED is 20 ° to 45 ° liquid crystal display device.
with PCB;
A first LED and a second LED spaced apart from the PCB and alternately arranged
Including,
The light emitting surface of each of the first LED and the second LED is a parallelogram having an acute angle and an obtuse angle.
with PCB;
A first LED and a second LED spaced apart from the PCB and alternately arranged
Including,
The light emitting surface of the first LED is an inverted trapezoidal shape having an acute angle and an obtuse angle, and the light emitting surface of the second LED is an isosceles trapezoidal shape having the acute angle and the obtuse angle.
with PCB;
A first LED and a second LED spaced apart from the PCB and alternately arranged
Including,
The light emitting surface of the first LED is an isosceles triangle, and the light emitting surface of the second LED is an inverted isosceles triangle.
According to claim 10 or 11,
An LED assembly in which an upper side of the light emitting surface of the first LED and a lower side of the light emitting surface of the second LED overlap.
According to claim 12,
The LED assembly in which the bottom of the light emitting surface of the first LED and the bottom of the light emitting surface of the second LED overlap.
According to claim 10 or 11,
Each of the first LED and the second LED includes a rear surface opposite to the light emitting surface, and an upper surface, a lower surface, a first side surface, and a second side surface connecting the light emitting surface and the rear surface,
An LED assembly in which light is output through the light emitting surface, the first side surface, and the second side surface.
According to claim 12,
Each of the first LED and the second LED includes a rear surface opposite to the light emitting surface, a bottom surface connecting the light emitting surface and the rear surface, a first inclined surface, and a second inclined surface,
An LED assembly in which light is output through the light emitting surface, the first inclined plane, and the second inclined plane.
According to claim 10 or 11,
The acute angle is 20 ° to 45 ° LED assembly.
According to claim 12,
The base angle of the first LED and the second LED is 20 ° to 45 ° LED assembly.

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