KR20120026394A - Backlight assembly and liquid crystal display device using the same - Google Patents

Abstract

PURPOSE: A backlight assembly and a liquid crystal display device with the same are provided to prevent a bright line in an edge type backlight unit structure to which a light guide plate is applied, thereby increasing brightness. CONSTITUTION: A light source provides light. A light guide plate(120) is separated from the light source. The light guide plate transfers light emitted from the light source upward. A guide panel(160) is arranged on an upper side of the light guide plate. A shock absorbing pad(163) is installed on a lower side of the guide panel.

Description

BACKLIGHT ASSEMBLY AND LIQUID CRYSTAL DISPLAY DEVICE USING THE SAME}

The present invention relates to a liquid crystal display device, and more particularly, to a backlight assembly having an improved structure to block light leakage from the liquid crystal display device, and a liquid crystal display device having the same.

In general, a flat panel display (FPD) is an indispensable display device for realizing not only a monitor of a desktop computer but also a compact and lightweight system such as a portable computer such as a notebook computer, a PDA, or a mobile phone terminal. The device is a liquid crystal display device (LCD; Liquid Crystal Display (PDP), Plasma Display Panel (PDP), Field Emission Display (FED; Field Emission Display). In particular, the liquid crystal display device is in the spotlight as a display device of a mobile phone, a computer monitor, a television, etc. because the liquid crystal display device is not only smaller than a CRT of an image having excellent visibility and average power consumption, but also a low heat generation amount.

Most of the liquid crystal display devices as described above are non-emissive type display devices that display an image by controlling the amount of light source coming from the outside. You need a (Backlight Assembly).

A liquid crystal display according to the related art having such a backlight assembly will be described with reference to FIGS. 1 to 4 as follows.

1 is a cross-sectional view of a liquid crystal display according to the related art.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1 and schematically illustrates a coupling structure of the light guide plate, the reflective film, and the guide panel.

1 and 2, a liquid crystal display according to the related art includes a liquid crystal panel 10, a backlight assembly (not shown) for providing light to the liquid crystal panel 10; It consists of a receiving member (not shown) for receiving and fixing the backlight assembly.

The liquid crystal panel 10 includes a color filter (CF) substrate 10a, a thin film transistor (TFT) substrate 10b disposed below the color filter substrate 10a, and these substrates. It includes a liquid crystal layer (not shown) interposed between (10a, 10b).

Meanwhile, the backlight assembly (not shown) includes a light guide plate 20, a light source unit 30 disposed on one side of the light guide plate 20 at a predetermined interval, and a reflector plate 40 provided below the light guide plate 20. And an optical sheet 50 provided on the light guide plate 20.

Here, the light source unit 30 is installed on the side of the light guide plate 20, each of which a plurality of light emitting diodes (LED) 31 and a light emitting element 31 is mounted And a substrate 33. In this case, the light emitting device 31 is a side view type device and emits light toward the side surface of the light guide plate 20. In addition, the substrate 33 is a flexible printed circuit board having excellent bending, and a circuit (not shown) is formed therein, and supplies external power to the light emitting device 31 through the circuit.

The light guide plate 20 is disposed to correspond to one side of the light source unit 30, that is, the light exit surface of the light emitting device 31 in which light is generated.

In addition, as shown in FIG. 2, a plurality of convex lens patterns 21 are formed along the longitudinal direction on the upper surface of the light guide plate 20 at regular intervals in a short side direction to improve the straightness of the light. It is. In this case, a valley 23 is formed between the plurality of lens patterns 21, and a part of the light emitted from the light emitting element 31 through a gap 25 formed between the valley 23 and the light guide plate 20. May leak.

The optical sheet 50 includes a diffuser plate 51 and at least one prism sheet 53, and is disposed on the light guide plate 20 to uniformly distribute luminance of light emitted from the light guide plate 20. Play a role.

The accommodation member (not shown) includes a guide panel 60, a lower cover 70, a top case 80, and the like.

Here, the guide panel 60 is formed in a rectangular frame shape of the upper and lower portions open, the liquid crystal panel 10 is seated on the upper surface of the rectangular frame, the lower side of the rectangular frame from the light source unit 30 A reflective film 61 is attached so that a part of the light emitted is reflected and proceeds back to the light guide plate 20. In this case, although the reflective film 61 is attached to the lower surface of the guide panel 60, the reflective film 61 contacts the lens pattern 21 protruding from the upper surface of the light guide plate 60 and the lower surface of the guide panel 60, respectively. As a result, a gap 25 is present between the valley 123 between the lens pattern 121 and the reflective film 61.

The lower cover 70 has a rectangular box shape with an open upper portion, and a backlight assembly (not shown) and a liquid crystal panel 10 are sequentially received and fixed therein.

In addition, the top case 80 covers four edge regions of the liquid crystal panel 10 and is assembled and fastened to a main support (not shown) or the lower cover 70.

Accordingly, the lower cover 70 in which the liquid crystal panel 10 and the backlight assembly (not shown) are accommodated is combined with the top case 80 to form a liquid crystal display device.

FIG. 3 is a flow chart illustrating a path of light emitted from a light source of a liquid crystal display according to the prior art, and FIG. 4 is a view of light emitted from the light source of the liquid crystal display according to the prior art through a valley between the lens parts of the light guide plate. It is a photograph showing the bright line generated by leakage.

In the liquid crystal display according to the related art, as shown in FIG. 3, light emitted through the light emitting element 31 is incident on one side of the light guide plate 20, that is, the light incident surface 20a. The incident light is emitted through the inside of the light guide plate 20 to form a surface light source and emitted in a direction of the liquid crystal panel 10. At this time, as shown in "A" of FIG. 3, a part of the light leaks through the gap 25 between the light guide plate 20 and the guide panel 60, and as shown in FIG. 4, a bright line appears.

As described above, the liquid crystal display according to the related art has the following problems.

According to the liquid crystal display device according to the related art, an optical gap that satisfies reliability is required to prevent collision with the light emitting device due to thermal expansion of the light guide plate. In particular, in the case of a dome type light emitting device package, a larger optical gap must be secured. At this time, the reflective film is interposed on the upper and lower surfaces to improve the light receiving efficiency due to the optical gap.

However, the gap between the light guide plate and the reflective film due to reliability problems and tolerances on the assembly. At this time, the light incident on the light-incident surface of the light guide plate is generally a total reflection occurs and is incident into the light guide plate, but the light incident into the gap between the reflective film and the light guide plate does not occur total reflection, as shown in FIG. . Therefore, the bright line becomes more severe as the gap between the reflective film and the light guide plate is larger.

In particular, when the light emitting device is installed only at one edge of the four edge parts of the light guide plate, the light emitting device package having high power must be used so that it is not only disadvantageous to bright lines, but also a lens pattern on the upper surface of the light guide plate. In the case of applying the pattern, the bright line becomes more severe.

Currently, the backlight unit employs technologies such as local dimming and scanning backlight unit to improve image quality and reduce power consumption. In particular, in the case of the scanning backlight unit, instead of a general light guide plate having a flat top surface, a plurality of lens patterns are used. Since the formed light guide plate is applied, the gap between the reflective film and the light guide plate becomes larger.

Therefore, the liquid crystal display according to the related art applies a light guide plate having a plurality of lens patterns, so that the gap between the reflective film and the light guide plate becomes larger, thereby causing a brighter line, thereby lowering the luminance due to the light leakage. It also adversely affects burns.

Accordingly, an object of the present invention is to solve the problems of the prior art, and an object of the present invention is to provide a backlight assembly capable of improving luminance by preventing bright lines in an edge type backlight unit structure to which a light guide plate is applied. The present invention provides a liquid crystal display device having the same.

A backlight assembly according to the present invention for achieving the above object, the light source for providing light; A light guide plate disposed to be spaced apart from the light source and sending light emitted from the light source in an upward direction; And a buffer panel disposed on an upper side of the light guide plate and provided with a buffer pad on a lower surface of the light guide plate that overlaps with an upper side of an edge portion of the light guide plate, the guide pad being in close contact with the light guide plate. .

Liquid crystal display device according to the present invention for achieving the above object is a light source for providing light; A light guide plate disposed to be spaced apart from the light source and sending light emitted from the light source in an upward direction; A guide panel disposed on an upper side of the light guide plate and provided with a buffer pad on a lower surface overlapping with an upper side of an edge portion of the light guide plate corresponding to the light source, wherein the buffer pad is in close contact with the light guide plate; And a liquid crystal panel disposed on the guide panel and configured to implement an image.

According to the backlight assembly and the liquid crystal display device having the same according to the present invention has the following effects.

According to the backlight assembly and the liquid crystal display device having the same according to the present invention, a gap is generated between the guide panel and the light guide plate due to the lens pattern formed on the upper surface of the light guide plate to improve the linearity of light. Interpose a buffer pad with foaming properties.

Therefore, in the present invention, due to the buffer pad having a foaming property interposed between the guide panel and the light guide plate, gaps between the light guide plate and the lens patterns are filled so that the light leaks through the valleys between the lens patterns of the light guide plate. By preventing the bright line is prevented.

In addition, since the gaps between the light guide plate and the lens patterns are filled, the light leaks through the valleys between the lens patterns of the conventional light guide plate, and then proceeds to the liquid crystal panel through the light guide plate, thereby improving luminance. It can be improved.

1 is a cross-sectional view of a backlight assembly and a liquid crystal display device having the same according to the related art.
FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1 and schematically illustrates a layout structure of a light guide plate, a reflective film, and a guide panel.
3 is a flow diagram of light showing a traveling path of light emitted from a light source of a liquid crystal display according to the related art.
4 is a photograph showing bright lines generated by light emitted from a light source of a liquid crystal display according to the related art leaking through a valley between lens portions of a light guide plate.
5 is a cross-sectional view illustrating a backlight assembly and a liquid crystal display device having the same according to an embodiment of the present invention.
FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 5, and is a cross-sectional view illustrating a coupling state of a light guide plate, a buffer pad, and a guide panel.
FIG. 7 is a flow chart illustrating a traveling path of light emitted from a light source of a liquid crystal display according to an exemplary embodiment.
8 is a cross-sectional view illustrating a backlight assembly and a liquid crystal display device having the same according to another embodiment of the present invention.
FIG. 9 is a cross-sectional view taken along the line VII-VII of FIG. 8, illustrating a coupling state of a light guide plate, a buffer pad, and a guide panel.
10 is a cross-sectional view illustrating a backlight assembly and a liquid crystal display device having the same according to another embodiment of the present invention.
FIG. 11 is a cross-sectional view taken along the line XI-XI of FIG. 10, and is a cross sectional view illustrating a coupling state of a light guide plate, a buffer pad, and a guide panel.
12 is a cross-sectional view illustrating a backlight assembly and a liquid crystal display device having the same according to another embodiment of the present invention.
FIG. 13 is a cross-sectional view taken along the line XIII-XIII of FIG. 12, illustrating a coupling state of the light guide plate, the buffer pad, and the guide panel.

Hereinafter, a backlight assembly and a liquid crystal display device having the same according to the present invention will be described in detail with reference to the accompanying drawings.

Here, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the scope of the invention to those skilled in the art. It is provided to inform you completely. Like reference numerals in the drawings refer to like elements.

5 is a cross-sectional view illustrating a backlight assembly and a liquid crystal display device having the same according to an embodiment of the present invention.

FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 5, and is a cross-sectional view illustrating a coupling state of a light guide plate, a buffer pad, and a guide panel.

FIG. 7 is a flow chart illustrating a traveling path of light emitted from a light source of a liquid crystal display according to an exemplary embodiment.

5 and 6, a liquid crystal display according to an exemplary embodiment of the present invention includes a liquid crystal panel 110 and a backlight assembly (not shown) for providing light to the liquid crystal panel 110; It consists of a receiving member (not shown) for receiving and fixing the backlight assembly.

Here, one side of the liquid crystal panel 110 may include a drive integrated circuit (IC) (not shown) for a liquid crystal display and a flexible printed circuit board having one end connected to the liquid crystal panel 110; FPCB) (not shown).

In addition, the liquid crystal panel 110 includes a color filter (CF) substrate 110a, a thin film transistor (TFT) substrate 110b disposed under the color filter substrate 110a, and these substrates. It includes a liquid crystal layer (not shown) interposed between (110a, 110b).

Although not shown in the drawing, the color filter substrate 110a may include a color filter layer on one surface, and an indium tin oxide (ITO) or indium zinc oxide (IZO) layer on the color filter layer. A common electrode (not shown) made of a transparent conductor is formed. In this case, the common electrode (not shown) may be formed on the thin film transistor substrate 110b instead of the color filter substrate 110a according to the liquid crystal driving mode.

Although not shown in the drawing, a TFT having a matrix shape is formed on the thin film transistor substrate 110b, and a data line and a gate line are connected to the source terminal and the gate terminal of the TFTs, respectively, and the pixel electrode is connected to the drain terminal. Is connected.

A drive integrated circuit (IC) (not shown) for a liquid crystal display device is mounted on one side of the thin film transistor substrate 110b and is a signal for driving the liquid crystal panel 110 and a gate drive. Signal and a plurality of timing signals for applying these signals at appropriate times, and apply a gate driving signal and a data driving signal to the gate line and the data line of the liquid crystal panel 110, respectively.

A flexible printed circuit board (FPCB, not shown) connected to one end of the liquid crystal panel 110 has one end connected to one side of the thin film transistor substrate 110b and formed at the other end of the printed circuit board. It converts an external signal of an analog type applied through a pad unit (not shown) and supplies it to the driving IC (not shown). In this case, the flexible printed circuit board (not shown) is bent and seated on the rear surface of the lower cover 170 which is a receiving member.

The backlight assembly (not shown) includes a light guide plate 120, a light source unit 130 disposed at a predetermined interval on one side of the light guide plate 120, and a reflector plate 140 provided below the light guide plate 120. And an optical sheet 150 provided on the light guide plate 120.

Here, the light source unit 130 is installed on the side of the light guide plate 120, that is, spaced apart from the light incident surface 120a, and each of the plurality of light emitting diodes (LEDs) 131 spaced apart at regular intervals; And a substrate 133 on which the light emitting element 131 is mounted. In this case, the light emitting device 131 is a side view type device, and emits light toward the side surface of the light guide plate 120. In addition, the substrate 133 is a flexible printed circuit board having excellent bending, and a circuit (not shown) is formed therein to supply external power to the light emitting device 131 through the circuit. At this time, in the present invention, a light emitting element 131 which is a point light source is used as a light source, but if necessary, beneficiation such as a cold cathode light source (CCFL) or a hot cathode light source (HCFL) You can also use circles.

The light guide plate 120 is disposed to correspond to one side of the light source unit 130, that is, spaced apart from the light exit surface 131a of the light emitting device 131 where light is generated, and has an optical distribution in the form of a point light source or a line light source. It serves to change to the light having an optical distribution in the form of a surface light source. In this case, the light guide plate 120 has an optical gap to prevent collision with the light emitting device 131 due to thermal expansion thereof. In addition, on the upper surface of the light guide plate 120, a plurality of convex lens patterns 121 are integrally formed along the length direction at regular intervals in a short side direction to improve the straightness of the light. In this case, a valley 123 is formed between the plurality of lens patterns 121, and light is emitted through a gap generated between the valley 123 and the guide panel 160 disposed on the light guide plate 120. Some of the light emitted from the element 131 may leak.

Here, as will be described later, in order to block the leakage of light, a cushioning pad 163 having a foaming property and a cushion is interposed between the light guide plate 120 and the guide panel 160, thereby providing the plurality of lenses. By filling the valleys 123 between the patterns 121, a part of the light emitted from the light emitting device 131 is not leaked through the valleys 123.

The optical sheet 150 includes a diffuser plate 151 and at least one prism sheet 153 and is disposed on the light guide plate 120 to uniformly distribute luminance of light emitted from the light guide plate 120. Play a role.

The accommodation member (not shown) includes a guide panel 160, a lower cover 170, a top case 180, and the like.

Here, the guide panel 160 is formed in a rectangular frame shape, the upper and lower portions are opened, the liquid crystal panel 110 is seated on the upper surface of the rectangular frame, the lower surface of the rectangular frame from the light source unit 130 on one side A reflecting film 161 is attached to reflect a part of the light emitted and proceeds to the inside of the light guide plate 120 again. In this case, the reflective film 161 is bonded to the lower surface of the guide panel 160 by an adhesive means such as a double-sided tape (not shown).

In addition, as shown in FIG. 6, foaming adjacent to the reflective film 161 is formed on the other side of the lower surface of the rectangular frame, that is, the region overlapping with the upper side of the edge portion of the light guide plate 120 corresponding to the light source unit 130. A buffer pad 163 having a foaming property, that is, a cushion, is provided. In this case, the buffer pad 163 completely fills the gap 125 between the light guide plate 120 and the guide panel 160. That is, when the guide panel 160 is assembled, a space formed between the light guide plate 120 and the guide panel 160, that is, formed between the plurality of lens patterns 121 formed on the upper surface of the light guide plate 120. A buffer pad 163 having a cushion is filled in the gap (not shown) between the valley 123 and the guide panel 160 so that a part of the light emitted through the light source 130 is not leaked. do. In particular, the cushion pad 163 having the cushion is pressed due to the assembly of the light guide plate 120 and the guide panel 160, so that the valley 123 between the lens patterns 121 is filled. There is no gap. At this time, the buffer pad 163 may be any material as long as it is an opaque material that can not transmit light while having a cushion. Like the reflective film 161, the buffer pad 163 is bonded to the lower surface of the guide panel 160 by an adhesive means such as a double-sided tape (not shown).

Accordingly, the gap 123 between the lens patterns 121 of the light guide plate 120 is filled by using the buffer pad 163 having the foaming property, and thus, the light guide plate 120 and the guide panel 160 are filled with each other. By preventing the gap of the light to prevent the progress of the light can be prevented.

As such, the gap between the light guide plate 120 and the guide panel 160 is filled by the buffer pad 163, so that the light traveling between the light guide plate 120 and the guide panel 160 is again inside the light guide plate 120. By proceeding to the light receiving efficiency is improved to be able to improve the brightness.

On the other hand, the lower cover 170 is a rectangular box shape with an open top, the backlight assembly (not shown) and the liquid crystal panel 110 is received and fixed in turn.

In addition, the top case 180 covers four edge regions of the liquid crystal panel 110 and is assembled and fastened to a main support (not shown) or the lower cover 170.

Accordingly, the lower cover 170 in which the liquid crystal panel 110 and the backlight assembly (not shown) are accommodated is combined with the top case 180 to form a liquid crystal display device.

In the liquid crystal display device configured as described above, as shown in FIG. 7, light emitted through the light emitting element 131 is incident on one side of the light guide plate 120, that is, the light incident surface 120a, and the incident light is emitted. The light of the point light source form is changed into the surface light source form through the inside of the light guide plate 120 to be emitted in the direction of the liquid crystal panel 110. In this case, as the gap 125 between the light guide plate 120 and the guide panel 160 is filled by the buffer pad 163, the light traveling between the light guide plate 120 and the guide panel 160 again passes through the light guide plate. As it proceeds to the inside 120, the bright line disappears as shown in "B" of FIG. 7, which is generated by light leaking through the gap between the light guide plate and the guide panel.

As described above, the backlight assembly and the liquid crystal display device having the same according to the present invention have an optical gap to prevent collision with the light emitting device due to thermal expansion of the light guide plate as in the conventional structure, and between the light guide plate and the guide panel. In addition to the reflective film, a cushion pad having cushioning characteristics is interposed to prevent bright lines. In particular, since a plurality of lens patterns formed on the upper surface of the light guide plate are used for the purpose of scanning, the structure has an excellent linearity of light. This has the advantage of improving the straightness of the light, but due to the large number of lens patterns, the gap becomes larger, so that the internal light reflection is more easily broken at the light incident part than the general light guide plate, that is, the flat light guide plate, so that the relative light guide plate is relatively flat on the light incident side. As a result, a lot of light is emitted, which is disadvantageous to the bright line.

Therefore, in the present invention, a bright line is prevented by filling a gap between the light guide plate and the guide panel by using a buffer pad having foaming, that is, cushioning property, to prevent the progress of light. In addition, by allowing the light leaked through the gap back to the inside of the light guide plate, the light receiving efficiency may be improved to improve luminance.

Meanwhile, a backlight assembly and a liquid crystal display device having the same according to another embodiment of the present invention will be described with reference to FIGS. 8 and 9. Here, as will be described later, in the liquid crystal display according to another embodiment of the present invention, a buffer pad is attached to the lower surface of the guide panel, and a reflective film is attached to one side of the buffer pad, except for this structure. Same as the case of one embodiment of the present invention.

8 is a cross-sectional view illustrating a backlight assembly and a liquid crystal display device having the same according to another embodiment of the present invention.

FIG. 9 is a cross-sectional view taken along the line VII-VII of FIG. 8, illustrating a coupling state of a light guide plate, a buffer pad, and a guide panel.

Referring to FIG. 8, a liquid crystal display according to another exemplary embodiment of the present invention may include a liquid crystal panel 210 and a backlight assembly (not shown) for providing light to the liquid crystal panel 210; It consists of a receiving member (not shown) for receiving and fixing the backlight assembly.

Here, one side of the liquid crystal panel 210 may include a drive integrated circuit (IC) (not shown) for a liquid crystal display and a flexible printed circuit board having one end connected to the liquid crystal panel 210; FPCB, not shown).

In addition, the liquid crystal panel 210 includes a color filter (CF) substrate 210a, a thin film transistor (TFT) substrate 210b disposed below the color filter substrate 210a, and these substrates. And a liquid crystal layer (not shown) interposed between 210a and 210b.

Although not shown in the drawing, the color filter substrate 210a has a color filter layer on one surface and a transparent material such as indium tin oxide (ITO) or indium zinc oxide (IZO) on the color filter layer. A common electrode (not shown) made of a conductor is formed. In this case, the common electrode (not shown) may be formed on the thin film transistor substrate 210b instead of the color filter substrate 210a according to the liquid crystal driving mode.

Although not shown in the drawing, a TFT having a matrix shape is formed on the thin film transistor substrate 110b, and a data line and a gate line are connected to the source terminal and the gate terminal of the TFTs, respectively, and the pixel electrode is connected to the drain terminal. Is connected.

The backlight assembly (not shown) includes a light guide plate 220, a light source unit 230 disposed on one side of the light guide plate 220 at a predetermined interval, a reflective plate 240 provided under the light guide plate 220, and the The optical sheet 250 is provided on the light guide plate 220.

Here, the light source unit 230 is installed on the side of the light guide plate 220, that is, spaced apart from the light incident surface 220a, and each of the plurality of light emitting diodes (LEDs) 231 spaced apart from each other by a predetermined interval. And a substrate 233 on which the light emitting element 231 is mounted. In this case, the light emitting device 231 is a side view type device, and emits light toward an image and a side surface of the light guide plate 220. In addition, the substrate 233 is a flexible printed circuit board having excellent bending, and a circuit (not shown) is formed therein to supply external power to the light emitting device 231 through the circuit. At this time, in the present invention, a light emitting element 231 which is a point light source is used as a light source, but if necessary, beneficiation such as a cold cathode light source (CCFL) or a hot cathode light source (HCFL) You can also use circles.

The light guide plate 220 is disposed to correspond to one side of the light source 230, that is, spaced apart from the light exit surface 231a of the light emitting device 231 where light is generated, and has an optical distribution in the form of a point light source or a line light source. It serves to change to the light having an optical distribution in the form of a surface light source. In this case, the light guide plate 220 has an optical gap (not shown) to prevent collision with the light emitting device 231 due to thermal expansion thereof. In addition, a plurality of convex lens patterns 221 are integrally formed along the longitudinal direction on the upper surface of the light guide plate 220 at regular intervals in a short side direction to improve the straightness of the light. In this case, a valley 223 is formed between the plurality of lens patterns 221, and a part of the light emitted from the light emitting element 231 may leak through the valley 223.

Here, as will be described later, in order to block the leakage of light, a cushioning pad 263 having a foaming, ie, cushioning property is interposed between the light guide plate 220 and the guide panel 260, and thus, By filling the valleys 223 between the lens patterns 221, a portion of the light emitted from the light emitting element 231 is prevented from leaking through the valleys 223.

The optical sheet 250 includes a diffuser plate 251 and at least one prism sheet 253 and is disposed on the light guide plate 220 to uniform the luminance distribution of the light emitted from the light guide plate 220. Play a role.

The accommodation member (not shown) includes a guide panel 260, a lower cover 270, a top case 280, and the like.

Here, the guide panel 260 is formed in a rectangular frame shape with an upper and lower portions open, the liquid crystal panel 210 is seated on the upper surface of the rectangular frame, the light guide plate 220 corresponding to the light source unit 230. A buffer pad 263 having a foaming property, that is, a cushion, is attached to a lower surface overlapping with an upper side of the edge portion of the c), and a reflective film 261 is attached to one side of the buffer pad 263. have. In this case, as shown in FIG. 9, the buffer pad 263 completely fills the gap between the light guide plate 220 and the guide panel 260. That is, at the time of assembling the guide panel 260, a space formed between the light guide plate 220 and the guide panel 260, that is, formed between the plurality of lens patterns 221 formed on the upper surface of the light guide plate 220. The gap between the valley 223 and the guide panel 260 is filled with the cushion pad 263 having the cushion, so that a part of the light emitted through the light source 230 may not leak through the gap. In particular, while being pressed by the assembly of the light guide plate 220 and the guide panel 260, the buffer pad 263 having the cushion fills the valleys 223 between the lens patterns 221, thereby providing a gap ( gaps are eliminated. Here, the buffer pad 263 may be any material as long as it is an opaque material that can not transmit light while having a cushion. In this case, each of the buffer pad 263 and the reflective film 261 is bonded to the lower surface of the guide panel 260 and the buffer pad 263 by an adhesive means such as a double-sided tape (not shown).

Accordingly, the gap 223 between the lens pattern 221 of the light guide plate 220 is filled by using the buffer pad 263 having the foaming property, and thus, the light guide plate 220 and the guide panel 260 are filled with each other. By preventing the gap 225 of the light to prevent the progress of the light can be prevented.

In this way, the gap 225 between the light guide plate 220 and the guide panel 260 is filled by the buffer pad 263, so that the light traveling between the light guide plate 220 and the guide panel 260 is again light guide plate ( 220, by proceeding to the inside, the light receiving efficiency is improved to improve the brightness.

The lower cover 270 has a rectangular box shape with an open top, and a backlight assembly (not shown) and a liquid crystal panel 210 are sequentially received and fixed therein.

In addition, the top case 280 covers four edge regions of the liquid crystal panel 210 and is assembled and fastened to a main support (not shown) or the lower cover 270.

Accordingly, the lower cover 270 in which the liquid crystal panel 210 and the backlight assembly (not shown) are accommodated is combined with the top case 280 to form a liquid crystal display device.

A liquid crystal display according to still another exemplary embodiment of the present invention will be described with reference to FIGS. 10 and 11 as follows.

Here, as will be described below, a backlight assembly and a liquid crystal display device having the same according to another embodiment of the present invention, a buffer pad is attached to one side of the lower surface of the guide panel, the lower surface of the guide panel including a portion of the buffer pad The reflective film is attached to the structure, except for this structure is the same as the case of an embodiment of the present invention.

10 is a cross-sectional view illustrating a backlight assembly and a liquid crystal display device having the same according to another embodiment of the present invention.

FIG. 11 is a cross-sectional view taken along the line XI-XI of FIG. 10, and is a cross sectional view illustrating a coupling state of a light guide plate, a buffer pad, and a guide panel.

Referring to FIG. 10, a liquid crystal display according to another exemplary embodiment of the present invention may include a liquid crystal panel 310 and a backlight assembly (not shown) that provides light to the liquid crystal panel 310; It consists of a receiving member (not shown) for receiving and fixing the backlight assembly.

Here, one side of the liquid crystal panel 310 may include a drive integrated circuit (IC) (not shown) for a liquid crystal display and a flexible printed circuit board having one end connected to the liquid crystal panel 310; FPCB, not shown).

In addition, the liquid crystal panel 310 includes a color filter (CF) substrate 310a, a thin film transistor (TFT) substrate 310b disposed below the color filter substrate 310a, and these substrates. It includes a liquid crystal layer (not shown) interposed between (310a, 310b).

Although not shown in the drawing, the color filter substrate 310a may include a color filter layer on one surface and a transparent material such as indium tin oxide (ITO) or indium zinc oxide (IZO) on the color filter layer. A common electrode (not shown) made of a conductor is formed. In this case, the common electrode (not shown) may be formed on the thin film transistor substrate 310b instead of the color filter substrate 310a according to the liquid crystal driving mode.

Although not shown in the drawing, a TFT having a matrix shape is formed on the thin film transistor substrate 310b, and a data line and a gate line are connected to a source terminal and a gate terminal of the TFTs, and a pixel electrode is connected to the drain terminal. Is connected.

The backlight assembly (not shown) includes a light guide plate 320, a light source unit 330 disposed at a predetermined interval on one side of the light guide plate 320, a reflector plate 340 provided under the light guide plate 320, and the It includes an optical sheet 350 provided on the light guide plate 320.

Here, the light source unit 330 is spaced apart from the side surface of the light guide plate 320, that is, the light incident surface 320a, and each of the plurality of light emitting diodes (LEDs) 331 spaced apart from each other by a predetermined interval. The light emitting device 331 includes a substrate 333 mounted thereon. In this case, the light emitting device 331 is a side view type device, and emits light toward the side surface of the light guide plate 320. In addition, the substrate 333 is a flexible printed circuit board having excellent bending, and a circuit (not shown) is formed therein to supply external power to the light emitting device 331 through the circuit. At this time, in the present invention, a light emitting device 331 that is a point light source is used as a light source, but if necessary, beneficiation such as a cold cathode light source (CCFL) or a hot cathode light source (HCFL) You can also use circles.

The light guide plate 320 is disposed to correspond to one side of the light source unit 330, that is, spaced apart from the light exit surface 331a of the light emitting device 331 where light is generated, and has an optical distribution in the form of a point light source or a line light source. It serves to change to the light having an optical distribution in the form of a surface light source. In this case, the light guide plate 320 has an optical gap to prevent collision with the light emitting device 331 due to thermal expansion thereof. In addition, on the upper surface of the light guide plate 320, a plurality of convex lens patterns 321 are integrally formed along the length direction at regular intervals in a short side direction to improve the straightness of the light. In this case, a valley 323 is formed between the plurality of lens patterns 321, and a part of the light emitted from the light emitting device 331 may leak through the valley 323.

Here, as will be described later, in order to block the leakage of light, a cushioning pad 363 having a foaming, ie, cushioning property is interposed between the light guide plate 320 and the guide panel 360, so that the plurality of By filling the valleys 323 between the lens patterns 321, a portion of the light emitted from the light emitting device 331 is prevented from leaking through the valleys 323.

The optical sheet 350 includes a diffuser plate 351 and at least one prism sheet 353 and is disposed on the light guide plate 320 to uniformly distribute luminance of light emitted from the light guide plate 320. Play a role.

The accommodation member (not shown) includes a guide panel 360, a lower cover 370, a top case 380, and the like.

Here, the guide panel 360 is formed in a rectangular frame shape with an upper and lower portions open, the liquid crystal panel 310 is seated on the upper surface of the rectangular frame, the light guide plate 320 corresponding to the light source unit 330. On one side of the lower surface of the guide panel 360 overlapping with the upper edge portion of the guide panel 360, a cushioning pad 363 having a foaming property, that is, a cushion is attached, and a guide including a part of the buffer pad 363. The reflective film 361 is attached to the other side of the lower surface of the panel 360. In this case, a portion of the buffer pad 363 on which the reflective film 361 is not laminated may completely fill the gap 325 between the light guide plate 320 and the guide panel 360, as shown in FIG. 11. do. That is, at the time of assembling the guide panel 360, a space formed between the light guide plate 320 and the guide panel 360, that is, formed between a plurality of lens patterns 321 formed on an upper surface of the light guide plate 320. The gap 325 between the valley 323 and the guide panel 360 is filled with a portion of the cushion pad 363 having the cushion, so that a part of the light emitted through the light source unit 330 is formed in the gap 325. There is no leakage through. In particular, while being pressed by the assembly of the light guide plate 320 and the guide panel 360, the cushion pad 363 having the cushion fills the valleys 323 between the lens patterns 321, thereby providing a gap ( gaps are eliminated. Here, the buffer pad 363 may be any material as long as it has an cushion and is an opaque material that cannot transmit light. In this case, each of the buffer pad 363 and the reflective film 361 is bonded to the lower surface of the guide panel 360 and the buffer pad 363 by an adhesive means such as a double-sided tape (not shown).

Therefore, a gap (not shown) between the lens patterns 321 of the light guide plate 320 is filled by using the buffer pad 363 having the foaming property, and thus, the light guide plate 320 and the guide panel 360 are disposed therebetween. By blocking the gap 325 of the light to prevent the progress of the light can be prevented.

In this way, the gap 325 between the light guide plate 320 and the guide panel 360 is filled by the buffer pad 363, so that the light traveling between the light guide plate 320 and the guide panel 360 again passes through the light guide plate ( 320, the light incident efficiency is improved by improving the brightness, thereby improving luminance.

The lower cover 370 has a rectangular box shape with an open top, and a backlight assembly (not shown) and a liquid crystal panel 310 are sequentially received and fixed therein.

In addition, the top case 380 covers four edge regions of the liquid crystal panel 310 and is assembled and fastened to a main support (not shown) or the lower cover 370.

Accordingly, the lower cover 370 in which the liquid crystal panel 310 and the backlight assembly (not shown) are accommodated is combined with the top case 380 to form a liquid crystal display device.

Meanwhile, a backlight assembly and a liquid crystal display device having the same according to another exemplary embodiment of the present invention will be described with reference to FIGS. 12 and 13.

Here, as will be described below, the liquid crystal display device according to another embodiment of the present invention, a polyethylene resin layer (PET) is formed on the lower surface of the guide panel, a buffer pad and a reflective film is attached thereon, Except for the structure, the structure is the same as in the embodiment of the present invention.

12 is a cross-sectional view illustrating a backlight assembly and a liquid crystal display device having the same according to another embodiment of the present invention.

FIG. 13 is a cross-sectional view taken along the line XIII-XIII of FIG. 10, and a cross-sectional view illustrating a coupling state of a light guide plate, a buffer pad, and a guide panel.

Referring to FIG. 12, a liquid crystal display according to another exemplary embodiment of the present invention may include a liquid crystal panel 410, a backlight assembly (not shown) that provides light to the liquid crystal panel 410; It consists of a receiving member (not shown) for receiving and fixing the backlight assembly.

Here, one side of the liquid crystal panel 410 may include a drive integrated circuit (IC) (not shown) for a liquid crystal display and a flexible printed circuit board having one end connected to the liquid crystal panel 410; FPCB, not shown).

In addition, the liquid crystal panel 410 includes a color filter (CF) substrate 410a, a thin film transistor (TFT) substrate 410b disposed under the color filter substrate 410a, and these substrates. And a liquid crystal layer (not shown) interposed between 410a and 410b.

Although not shown in the drawing, the color filter substrate 410a has a color filter layer on one surface and a transparent material such as indium tin oxide (ITO) or indium zinc oxide (IZO) on the color filter layer. A common electrode (not shown) made of a conductor is formed. In this case, the common electrode (not shown) may be formed on the thin film transistor substrate 410b instead of the color filter substrate 410a according to the liquid crystal driving mode.

Although not shown in the figure, a TFT in the form of a matrix is formed on the thin film transistor substrate 410b, and a data line and a gate line are respectively connected to a source terminal and a gate terminal of the TFTs, and a pixel electrode is connected to the drain terminal. Is connected.

The backlight assembly (not shown) includes a light guide plate 420, a light source unit 430 disposed at regular intervals on the light incident surface 420a of the light guide plate 420, and a reflection plate provided below the light guide plate 420. 440 and an optical sheet 450 provided on the light guide plate 420.

Here, the light source unit 430 is disposed spaced apart from the side of the light guide plate 420, the light incident surface 420a, each of the plurality of light emitting diodes (LED) 431 spaced apart at regular intervals, The light emitting device 431 includes a substrate 433 mounted thereon. In this case, the light emitting device 431 is a side view type device, and emits light toward the side surface of the light guide plate 420, that is, the light incident surface 420a. In addition, the substrate 433 is a flexible printed circuit board having excellent bending, and a circuit (not shown) is formed therein to supply external power to the light emitting device 431 through the circuit. At this time, in the present invention, a light emitting element 431 which is a point light source is used as a light source, but if necessary, beneficiation such as a cold cathode light source (CCFL) or a hot cathode light source (HCFL) You can also use circles.

The light guide plate 420 is disposed to correspond to one side of the light source unit 430, that is, spaced apart from the light exit surface 431a of the light emitting device 431 that generates light, and has an optical distribution in the form of a point light source or a line light source. It serves to change to the light having an optical distribution in the form of a surface light source. In this case, an optical gap exists between the light guide plate 420 and the light source unit 430 to prevent collision with the light emitting device 431 due to thermal expansion thereof. In addition, on the upper surface of the light guide plate 420, a plurality of convex lens patterns 421 are integrally formed along the length direction at regular intervals in a short side direction to improve the straightness of the light. In this case, a valley 423 is formed between the plurality of lens patterns 421, and a part of the light emitted from the light emitting element 431 may leak through the valley 423.

Here, as will be described later, in order to block the leakage of light, a cushioning pad 463 having a foaming, ie, cushioning property is interposed between the light guide plate 420 and the guide panel 460, and thus, By filling the valleys 423 between the lens patterns 421, a portion of the light emitted from the light emitting element 431 is prevented from leaking through the valleys 423.

The optical sheet 450 includes a diffuser plate 451 and at least one prism sheet 453, and is disposed on the light guide plate 420 to uniformly distribute luminance of light emitted from the light guide plate 420. Play a role.

The accommodation member (not shown) includes a guide panel 460, a lower cover 470, a top case 480, and the like.

Here, the guide panel 460 is formed in a rectangular frame shape of the upper and lower portions, the liquid crystal panel 410 is seated on the upper surface of the rectangular frame, the polyethylene resin layer on the lower surface of the guide panel 460. PET resin (465) is applied. In addition, one side of the polyethylene resin layer 465 formed on the lower surface of the guide panel 460 overlapping with the upper side of the edge portion of the light guide plate 420 corresponding to the light source 430 has a foaming property, that is, cushioning. The buffer pad 463 is attached thereto, and the reflective film 461 is attached to the other side of the polyethylene resin 465 to which the buffer pad 463 is not attached. In this case, as shown in FIG. 13, the buffer pad 463 completely fills the gap 425 (not shown) between the light guide plate 420 and the guide panel 460. That is, when the guide panel 460 is assembled, a space formed between the light guide plate 420 and the guide panel 460, that is, formed between the plurality of lens patterns 421 formed on the upper surface of the light guide plate 420. A portion of the buffer pad 463 having the cushion is filled between the gap 425 between the valley (not shown) and the guide panel 460, so that a part of the light emitted through the light source unit 430 is disposed in the gap (not shown). There is no leakage through. In particular, the cushion pad 463 having the cushion is pressed due to the assembly of the light guide plate 420 and the guide panel 460, and thus fills the valley 423 between the lens patterns 421. gaps are eliminated. Here, the buffer pad 363 is any material can be used as long as it is an opaque material that can not transmit light while having a cushion. In this case, the buffer pad 463 and the reflective film 461 are bonded to the polyethylene resin 465 coated on the lower surface of the guide panel 460 by an adhesive means such as a double-sided tape (not shown).

Accordingly, the gap 423 between the light guide plate 420 and the guide panel 460 is filled by filling the valley 423 between the lens patterns 421 of the light guide plate 420 using the buffer pad 463 having the foaming property. By preventing the gap (not shown) of the light to prevent the progress of the light can be prevented.

As such, a gap (not shown) between the light guide plate 420 and the guide panel 460 is filled by the buffer pad 463 so that the light traveling between the light guide plate 420 and the guide panel 460 is again light guide plate. By proceeding to the inside 420, the light receiving efficiency is improved to improve the brightness.

The lower cover 470 has a rectangular box shape with an open top, and a backlight assembly (not shown) and a liquid crystal panel 410 are sequentially received and fixed therein.

In addition, the top case 480 covers four edge regions of the liquid crystal panel 410 and is assembled and fastened to a main support (not shown) or the lower cover 470.

Accordingly, the lower cover 470 in which the liquid crystal panel 410 and the backlight assembly (not shown) are accommodated is combined with the top case 480 to form a liquid crystal display device.

As described above, according to the backlight assembly and the liquid crystal display device having the same according to the embodiments of the present invention, a gap is generated between the guide panel and the light guide plate due to a lens pattern formed to improve the linearity of light on the upper surface of the light guide plate. A buffer pad having a foaming property is interposed between the guide panel and the light guide plate.

Therefore, according to the present invention, due to the buffer pad having a foaming property interposed between the guide panel and the light guide plate, gaps between the light guide plate and the lens patterns are blocked to allow the light to travel through the valleys between the lens patterns of the light guide plate. By blocking, bright lines are prevented.

In addition, since the gaps between the light guide plate and the lens patterns are blocked, the light leaks through the valleys between the lens patterns of the conventional light guide plate and proceeds back to the liquid crystal panel through the light guide plate, thereby improving light receiving efficiency and improving luminance. You can do it.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

110: liquid crystal panel 110a: color filter substrate
110b: thin film transistor substrate 120: light guide plate
121a: light incident surface 121: lens pattern
123: Goal 125: Gap
130: light source 131: light emitting element
131a: light exit surface 133: substrate
140: reflector 150: optical sheet
151: diffusion plate 153: prism sheet
160: guide panel 161: reflective film
163: buffer pad 170: lower cover
180: topcase

Claims (24)

A light source for providing light;
A light guide plate disposed to be spaced apart from the light source and sending light emitted from the light source in an upward direction; And
And a buffer panel disposed on an upper side of the light guide plate and provided with a buffer pad on a lower surface of the light guide plate that overlaps with an upper side of an edge portion of the light guide plate, the guide pad being in close contact with the light guide plate. The backlight assembly of claim 1, wherein the buffer pad is made of an opaque material having foaming properties. The backlight assembly of claim 1, wherein an upper surface of the light guide plate is flat or integrally formed along the longitudinal direction so that a plurality of lenticular patterns are spaced apart in a short side direction. The backlight assembly of claim 3, wherein the buffer pad completely fills the gap between the valley formed between the plurality of lens patterns and the light guide plate. The backlight assembly of claim 1, wherein the reflective film is provided on a lower surface of the guide panel. The lower surface of the guide panel is provided with the reflective film and the buffer pad, the buffer pad is formed on the lower surface of the guide panel overlapping the upper side of the light guide plate corresponding to the light source, the reflection The film is a backlight assembly, characterized in that formed on the lower surface of the guide panel positioned between the light guide plate and the light source. The backlight assembly of claim 6, wherein a polyethylene resin layer is interposed between the reflective film, the buffer pad, and the lower surface of the guide panel. According to claim 5, wherein the lower surface of the guide panel is provided with the reflective film and the buffer pad, the buffer pad is formed on the entire lower surface of the guide panel, the reflective film is a buffer pad located between the light guide plate and the light source. A backlight assembly, characterized in that formed on. The lower surface of the guide panel is provided with the reflective film and the buffer pad, the buffer pad is formed on the lower surface of the guide panel overlapping the upper side of the light guide plate corresponding to the light source, the reflection The film is a backlight assembly, characterized in that formed on the lower surface of the guide panel positioned between the light guide plate and the light source including a portion of the buffer pad. The backlight assembly of claim 1, wherein an optical sheet including a diffusion plate and at least one prism sheet is disposed on the light guide plate. The display device of claim 1, further comprising: a lower cover configured to accommodate the liquid crystal panel, the light guide plate, and the guide panel; And a top case which covers four edge regions of the liquid crystal panel and is assembled and fastened to the lower cover. The light source of claim 1, wherein the light source is selected from a light emitting device 131 as a point light source, a cold cathode light source (CCFL), and a hot cathode light source (HCFL). Backlight assembly, characterized in that. A light source for providing light;
A light guide plate disposed to be spaced apart from the light source and sending light emitted from the light source in an upward direction;
A guide panel disposed on an upper side of the light guide plate and provided with a buffer pad on a lower surface overlapping with an upper side of an edge portion of the light guide plate corresponding to the light source, wherein the buffer pad is in close contact with the light guide plate; And
And a liquid crystal panel disposed on the guide panel and configured to implement an image. The liquid crystal display device of claim 13, wherein the buffer pad is made of an opaque material having a foaming property. The liquid crystal display of claim 13, wherein an upper surface of the light guide plate is flat or integrally formed along the length direction such that a plurality of lens patterns are spaced apart from each other in a short side direction. The liquid crystal display of claim 13, wherein the buffer pad completely fills a gap between a valley formed between the plurality of lens patterns and the light guide plate. The liquid crystal display of claim 13, wherein the reflective film is disposed on a lower surface of the guide panel. The lower surface of the guide panel is provided with the reflective film and the buffer pad, the buffer pad is formed on the lower surface of the guide panel overlapping the upper side of the light guide plate corresponding to the light source, the reflection The film is formed on the lower surface of the guide panel positioned between the light guide plate and the light source. 19. The liquid crystal display device according to claim 18, wherein a polyethylene resin layer is interposed between the reflective film, the buffer pad, and the lower surface of the guide panel. The buffer pad of claim 17, wherein the lower surface of the guide panel includes the reflective film and the buffer pad, the buffer pad is formed on the entire lower surface of the guide panel, and the reflective film is positioned between the light guide plate and the light source. Liquid crystal display device characterized in that formed on. The lower surface of the guide panel is provided with the reflective film and the buffer pad, the buffer pad is formed on the lower surface of the guide panel overlapping the upper side of the light guide plate corresponding to the light source, the reflection The film is a liquid crystal display, characterized in that formed on the lower surface of the guide panel positioned between the light guide plate and the light source including a portion of the buffer pad. The liquid crystal display of claim 13, wherein an optical sheet including a diffusion plate and at least one prism sheet is disposed above the light guide plate. The display device of claim 13, further comprising: a lower cover configured to receive and fix the liquid crystal panel, the light guide plate, and the guide panel; And a top case which covers four edge regions of the liquid crystal panel and is assembled and fastened to the lower cover. The light source of claim 13, wherein the light source is selected from a light emitting device 131 as a point light source, a cold cathode light source (CCFL) and a hot cathode light source (HCFL). Liquid crystal display characterized in that.

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