KR102073105B1 - Liquid crystal display module including the same - Google Patents

Abstract

The present invention discloses a liquid crystal display module. More specifically, the present invention provides a structure that improves the assemblability of the liquid crystal display module using a LED element, which is a point light source for providing light to the liquid crystal panel as a backlight, and improves work efficiency.
In an exemplary embodiment of the present invention, a step portion to which a lamp housing is coupled is formed on one side of the guide panel of the liquid crystal display module, and the lamp housing is coupled to the outside of the guide panel so that the guide panel is inserted into the lamp housing. By removing the adhesive tape for minimizing assembly defects, there is an effect that can increase the efficiency of the assembly process.

Description

Liquid crystal display module {LIQUID CRYSTAL DISPLAY MODULE INCLUDING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly, to a liquid crystal display having a structure capable of improving the assemblability of a liquid crystal display module using a LED element, which is a point light source for providing light to a liquid crystal panel, as a backlight, and improving work efficiency It relates to a device module.

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

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

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

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

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

The above-described light emitting diode device emits light energy of various wavelengths by bonding an n-type semiconductor having a majority carrier to a p-type semiconductor having a majority carrier and applying an electrical signal thereto. It has a permanent life, almost no replacement and maintenance, high light conversion efficiency, so the power consumption is very low compared to other light sources, and it is suitable as a light source of a backlight unit because it has the advantage of being compact, thin and light.

FIG. 1A is a perspective view of a portion of a liquid crystal display module having a light emitting structure having a conventional LED as a light source, and FIG. 1B is a cross-sectional view of a portion of the liquid crystal display module of FIG. 1B in an assembled state.

Referring to FIGS. 1A and 1B, the conventional metering type liquid crystal display module 10 includes a liquid crystal panel 11 displaying an image, a backlight unit 21, 25, 31 providing light thereto, and a modularization thereof. It consists of a guide panel 40.

The liquid crystal panel 11 includes a liquid crystal layer in which two substrates are bonded to each other by a predetermined distance and interposed therebetween.

 The backlight units 21, 25, and 31 may include a plurality of LED elements 21, which are light sources, a lamp housing 25 in which the LED elements 21 may be mounted therein to protect the light and emit light in one direction, and LEDs. A light guide plate 31 for guiding light emitted from the element 21 toward the liquid crystal panel 11 and a plurality of optical sheets, although not shown.

The guide panel 40 has a lamp housing 25 and a light guide plate 31 mounted therein, and a liquid crystal panel 11 is mounted thereon to support the rear and side surfaces thereof.

The liquid crystal display module having such a structure combines the lamp substrate 22 bonded with the LED elements 21 to the lamp housing during assembly (ⓐ) and slightly protrudes from the other surface of the guide panel 40 to form a ?? The lamp housing 25 is inserted into one side and coupled to the guide panel 40 (ⓑ). Subsequently, the light guide plate 31 is mounted on the guide panel 40 in such a manner that an incident surface is inserted into the opening of the lamp housing 25 (ⓒ, ⓓ). Next, the liquid crystal display module is assembled in an order of mounting the optical sheet (not shown) on the light guide plate 31 (not shown) and mounting the liquid crystal panel 11 thereon (ⓔ).

Therefore, the conventional liquid crystal display device module is assembled according to the above procedure (ⓐ → ⓑ → ⓒ → ⓓ → ⓔ). In particular, the lamp housing 25 is inserted to the innermost side of the inner surface of the guide panel 40 and guided. It is assembled in the form of being fixed to the bottom surface of the guide panel 40 by a double-sided adhesive tape (TP) provided on the bottom surface of the panel 40. However, the? -Shaped inner space of the guide panel 40 is designed to correspond to the minimum margin of the width of the lamp housing 25, the adhesive double-sided tape (TP) is perpendicular to the direction in which the lamp housing 25 is inserted Since the assembly process is not easy, and the lamp housing 25 is not inserted correctly, defects often occur.

2A and 2B are diagrams illustrating an example in which assembly failure occurs in a conventional LCD module.

2A and 2B, in the liquid crystal display module 10, the double-sided adhesive tape TP is applied to the lamp housing 25 to fix the lamp housing 25 in which the light source is mounted in the backlight unit to the guide panel 40. As it is located between the lower surface of the 25 and the upper surface of the bottom surface of the guide panel 40, it is perpendicular to the assembling direction of the lamp housing 25 so that a partial region is not completely inserted into the guide panel 40 during assembly. Misadjustment failure that is fixed in a state often occurs, causing a gap between one side of the lamp housing 25 and the guide panel 40.

If the above-mentioned misfit failure occurs, the lamp housing 25, which has already been fixed, must be removed again and the same assembly process is performed again. Therefore, the process time is delayed, which causes a rise in manufacturing cost.

The present invention has been made to solve the above-described problems, an object of the present invention is to provide a liquid crystal display module that improves the assembly defects generated in the process of assembling the lamp housing and the guide panel in the assembly process of the liquid crystal display module. It is.

In order to achieve the above object, a liquid crystal display device according to a preferred embodiment of the present invention, a liquid crystal panel; A backlight unit including at least one optical member including a light guide plate disposed on a rear surface of the liquid crystal panel, and a lamp housing facing one side of the light guide plate and on which a plurality of LED elements are mounted; And a guide panel on which the liquid crystal panel and the optical sheet are seated, and an opening through which the lamp housing is inserted from one side.

The lamp housing is characterized in that the cross section '' 'shaped, the lower bent portion is formed at least longer than the upper bent portion.

The lower bent portion is characterized in that it is disposed in parallel with the bottom surface of the guide panel.

The lower bent portion, the end is protruded in the inner direction of the guide panel, characterized in that inserted into the guide hole formed in the bottom surface of the guide panel.

The downward bending portion is fixed to the guide panel through at least one screw member in a rear direction.

The upper bent portion is characterized in that the housing hole is formed is inserted into the guide protrusion formed in the connecting portion for connecting both ends of the guide panel in the front.

The guide panel is characterized in that the center of the bottom surface is opened, the bottom surface is disposed in parallel with the lower bent portion of the lamp housing.

The bottom surface is characterized in that the guide hole is formed is inserted into the housing protrusion formed in the lower bent portion.

The guide panel may include a connecting portion for connecting two side surfaces adjacent to the opening in a front direction among three sides, and the connecting portion has a guide protrusion inserted into a guide hole formed in an upper bent portion of the guide panel. It is done.

The light guide plate may be mounted inside the guide panel in a state in which the lamp housing is coupled to the guide panel.

The liquid crystal display module according to an embodiment of the present invention, by forming a stepped portion to which the lamp housing is coupled to one side of the guide panel, by combining the lamp housing from the outside of the guide panel to form a guide panel inserted into the lamp housing By removing the adhesive tape for conventional bonding, there is an effect to minimize the assembly defects and increase the efficiency of the assembly process.

FIG. 1A is a perspective view of a portion of a liquid crystal display module having a light metering structure having a conventional LED as a light source.
FIG. 1B is a cross-sectional view of a portion of the liquid crystal display module of FIG. 1B assembled.
2A and 2B are diagrams illustrating an example in which assembly failure occurs in a conventional LCD module.
3 is an exploded perspective view of the entire structure of a liquid crystal display module according to an exemplary embodiment of the present invention, and FIG. 4 is a cross-sectional view of the liquid crystal display module of FIG. 3 in an assembled state.
5A and 5B illustrate front and rear surfaces of a liquid crystal display module according to an exemplary embodiment of the present invention, in which a guide panel and a lamp housing are coupled to each other.
6 is a cross-sectional view taken along the line VI-VI 'of FIG. 5A.

Hereinafter, a structure of a liquid crystal display device module according to an exemplary embodiment of the present invention will be described with reference to the drawings. The drawings referred to in the following description of the embodiments of the present specification are not intended to limit the shapes and positions of the components to the illustrated forms, and in particular, in the drawings, the structure and shapes of the liquid crystal display device module which is a technical feature of the present invention. Some components are exaggerated or scaled down to help understand.

3 is an exploded perspective view of the entire structure of a liquid crystal display module according to an exemplary embodiment of the present invention, and FIG. 4 is a cross-sectional view of the liquid crystal display module of FIG. 3 in an assembled state.

3 and 4, the liquid crystal display device module 100 according to the embodiment of the present invention includes a liquid crystal panel 110 for displaying an image and a backlight unit 120 for supplying light to the liquid crystal panel 110. ) And a guide panel 140 for mounting them.

The liquid crystal panel 110 includes a liquid crystal layer interposed between the first substrate 111 and the second substrate 112 at a predetermined distance and interposed therebetween. Not only the thin film transistor but also various wirings and electrodes are formed on the first substrate 111, and a color filter and a black matrix are formed on the second substrate 112 as a substrate for displaying RGB color. Although not shown here, a driving IC (not shown) may be bonded to one end of the first substrate 111 to be electrically connected to the above-described wiring and electrode to drive the thin film transistor.

The first substrate 111 of the liquid crystal panel 110 includes a plurality of gate wirings and data wirings arranged vertically and horizontally, and a point where the two wirings intersect is defined as a pixel area. In each pixel area, a thin film transistor as a switching element is formed.

In addition, the second substrate 112 is formed with a color filter composed of sub-color filters for the three primary colors that implement the colors of red, green, and blue, and each color between each sub-color filter And a black matrix (BM) is formed to block light passing through the liquid crystal layer.

The first and second substrates 111 and 112 configured as described above are disposed to face each other, the liquid crystal layer is interposed between the two substrates, and bonded to each other by a sealant formed outside the pixel regions. Will be configured. In addition, although not shown, a polarizing plate (not shown) is attached to the outer surfaces of the first and second substrates 111 and 112 described above to uniformly polarize the light passing through the liquid crystal panel 110 to implement an image. .

The backlight unit 120 is disposed on the lower side of the above-described liquid crystal panel 110, a plurality of LED elements 121 for emitting light, the LED substrate 122, the LED elements 121 are bonded in a line, The LED substrate 122 is mounted inward and includes a lamp housing 125 coupled at an outer side of the guide panel 140 to be described later.

Here, the LED element 121 is composed of a plurality of sets of three RGB LED elements (Light Emitting Diode) for emitting monochromatic light of red (R), green (G), and blue (B), or a plurality of sets, or One type of LED element emitting white light may be formed in plural.

In addition, the LED element 121 may be bonded in a line to the lamp substrate 122 composed of a conventional printed circuit board (PCB), the lamp substrate 122 is disposed along the side of the light guide plate 131, the light emitting surface It is mounted inside the lamp housing 125 so as to face the incident surface of the light guide plate 131.

In addition, the lamp housing 125 may allow the light emitted from the LED element 121 to be incident on the light guide plate 131 efficiently, and may be formed of a metal material to protect the breakage of the LED element 121 from external impact. In addition, the light directed toward the inner wall instead of the incident surface of the light guide plate 124 is reflected toward the light guide plate 131.

In particular, the lamp housing 125 of the present invention has a cross-section of the 'c' shape, the lower bent portion is formed relatively longer than the upper bent portion, one side of the guide panel 140 is inserted into the 'c' shape. Combined in the form. In addition, for fixing with the guide panel 140, the upper bent portion is formed with a housing hole 124 is inserted into the upper projection 144 of the guide panel 140, the lower bent portion of the back of the guide panel Two housing protrusions 128 inserted into the guide holes 146 are further formed.

According to this structure, the lamp housing 125 is coupled at the outer surface of the guide panel 140 so that a separate adhesive means for fixing the conventional lamp housing is omitted.

In addition, the backlight unit 120 includes a plurality of optical members 130 for increasing light efficiency, and the optical members 130 are disposed in the lower direction of the liquid crystal panel 110, and the lamp housing 125 is disposed in the lower direction. The light guide plate 131 guiding the light emitted from the LED element 121 toward the upper surface, that is, the liquid crystal panel 110, and the light directed toward the lower side of the light traveling through the inside of the light guide plate 131 again. A reflection sheet 132 for reflecting toward the direction, a diffusion sheet 132 for diffusing the light emitted through the light guide plate 131 evenly over the entire area of the liquid crystal panel 110, and a diffusion sheet. It includes a plurality of prism sheets 134, 135 for condensing the light diffused by the liquid crystal panel 100.

The light guide plate 131 guides the light incident from the LED 121 in the upper direction to spread the light evenly over the entire area of the liquid crystal panel 110. The light emitted from the LED element 121 proceeds from the incident surface of the light guide plate 131 to the other side, and is reflected and refracted in the light guide plate 131 to provide light uniformly to the rear surface of the diffusion sheet 125 on the upper surface. Done.

The reflective sheet 132 is provided under the light guide plate 125 and reflects the light exiting to the lower surface of the light guide plate 131 to be incident on the light guide plate 131 among the light passing through the inside of the light guide plate, and the liquid crystal. It serves to protect the back of the display device module 100.

As the light emitted from the light guide plate 131 passes through the diffusion sheet 133, the diffusion sheet 133 scatters the light and provides the light to the prism sheet 134 on the upper surface. The diffusion sheet 125 may be formed of a multilayered structure, which is a resin layer in the center and a protective layer formed on upper and lower surfaces thereof.

In addition, the prism sheets 134 and 135 have a first prism sheet 134 in which a plurality of prisms are formed in which the long axis extends in the x-axis direction, and a prism shape in which the long axis extends in the y-axis direction perpendicular to the x-axis. The second prism sheet 135 may be formed. The prism sheets 134 and 135 serve to improve the straightness of the light by refracting the light incident from the rear surface in the x and y axis directions.

Guide panel 140 has a rectangular frame shape, the center portion of the bottom surface is open. In addition, a stepped portion is formed in the inner surface, and the stepped portion surrounds the optical member 130, and the liquid crystal panel 110 is seated on the top of the stepped portion to form an external appearance of the liquid crystal display device module 100. The guide panel 140 may be made of a synthetic resin formed by injection molding.

In particular, the guide panel 140 of the present invention is open so that one side of the four sides, the lamp housing 125 is coupled in the outer direction. That is, there is no side wall on one side, and the upper bent portion of the lamp housing 125 is coupled to the side, and the lower bent portion is coupled to contact the bottom surface inside. The guide protrusion 144 is formed at the upper side of the open side, and the guide protrusion 144 is inserted into the housing hole 124 when the lamp housing 125 is coupled to fix the top of the lamp housing 125. In addition, guide holes 146 are formed at both bottom surfaces of the guide panel 140, so that the housing protrusion 128 formed in the lower bent portion of the lamp housing 125 is inserted into the lamp housing 125. The lower part is fixed.

When the lamp housing 125 is coupled to the guide panel 140, the reflective sheet 132 and the light guide plate 131 are sequentially mounted on the bottom surface of the guide panel 140, and the diffusion sheet 133 and the prism thereon. Sheets 134 and 135 are mounted. Subsequently, although not shown, a predetermined adhesive tape (not shown) is provided above the four sides of the guide panel 140 to form the liquid crystal display module 100 by attaching the liquid crystal panel 110 thereon.

Here, the adhesive tape not only serves to couple and fix the liquid crystal panel 110 and the guide panel 140 to each other, but also serves to block light emitted from the light source from leaking to the outside.

According to this structure, the liquid crystal display device module 100 according to the embodiment of the present invention inserts and fixes the lamp substrate 122 in which the LED element 121 is bonded to the inside of the lamp housing 125 during assembly. The lamp housing 125 is inserted into and coupled to the side opening area of the guide panel 140. Next, the assembly of the backlight unit 120 is completed by mounting the optical member 130 inside the guide panel 140, and the liquid crystal panel module 100 is assembled by mounting the liquid crystal panel 110 thereon. Will complete.

That is, the liquid crystal display module 100 according to the present invention conventionally (see FIGS. 1A and 1B), the lamp housing 25 which is coupled to the inside of the guide panel 40 through an adhesive means outside the guide panel 40. By combining in, the assembly means of the liquid crystal display module is improved by omitting the adhesive means and reducing the defective rate.

Hereinafter, the coupling structure of the guide panel and the lamp housing constituting the liquid crystal display module of the present invention will be described in detail with reference to the accompanying drawings.

5A and 5B illustrate front and rear views of a structure in which a guide panel and a lamp housing are coupled to each other in a liquid crystal display module according to an exemplary embodiment of the present invention. FIG. 6 is a cross-sectional view taken along line VI-VI ′ of FIG. 5A. It is a figure which shows the cut surface.

5A and 5B, the lamp housing 125 and the guide panel 140 of the present invention have an opening area when the lamp housing 125 is viewed from one side of the guide panel 140 when viewed in the drawing. Joined in the form of being inserted in the downward direction.

Here, the lamp housing 125 has a cross-section 'c' shaped, the lower bent portion is formed relatively longer than the upper bent portion, the lamp substrate 122 is mounted inside the side wall. Accordingly, when viewed from the front, the lower bent portion is exposed, and is disposed horizontally with the bottom surface of the guide panel 140. Here, the lower bent portion is disposed at the minimum spacing so as to substantially contact the bottom surface of the guide panel 140. Although not shown, the lamp substrate 122 may be attached by the lamp housing 125 and a double-sided adhesive tape (not shown).

The lamp housing 125 has a protection function of the LED element 121 mounted therein, a function of dissipating heat generated from the LED element 121, and the light emitted from the LED element 121 in the light emitting surface direction, that is, the light guide plate. It is preferably composed of a metal material so that it can be reflected in the direction of the incident surface (not shown).

On the other hand, the lamp housing 125 has a housing protrusion 128 is formed at the end of the lower bent portion to have a predetermined length in the bottom surface direction. The housing protrusion 128 may be formed to be biased at both ends of the lower bent portion, and may be inserted into the guide hole 146 formed in the bottom surface of the guide panel 140 to be described later in the advancing direction. Accordingly, the lower bent portion is fixed to the bottom surface.

The housing hole 124 is formed at the central portion of the upper bent portion of the lamp housing 125. This is a portion into which the guide protrusion 144 formed in the guide panel 140 is inserted, and according to this structure, the upper bent portion is fixed to the guide panel 140.

Therefore, when viewed from the entire lamp housing 125 having a 'c' shape, the lower bent portion and the upper bent portion are respectively coupled to the bottom surface of the guide panel 140 and the connecting portion to be described later, so that they are stable even without any external force. To be fixed.

The guide panel 140 has an opening in the center of the bottom surface, and has an opening in which one of the side walls on the four sides is removed. When viewed from the front, the opening becomes the lower region of the guide panel 140 and the bottom surface adjacent to the opening is also removed. In addition, both side walls of the guide panel 140 are connected to each other to the upper portion of the opening region so that the opening region is covered when viewed from the front, and the upper bent portion of the lamp housing 125 is inserted into the lower portion of the connected portion during assembly. To be combined. The guide panel 140 may be formed of a plastic material in order to form an external appearance of the liquid crystal display module and to maintain lightness and rigidity.

In addition, a predetermined guide protrusion 144 is formed at the center of the side wall connection portion, and a housing hole 124 is formed at a position corresponding to the guide protrusion 144 at the upper bent portion of the lamp housing 125. Accordingly, when the guide panel 140 and the lamp housing 125 are coupled, the guide protrusion 144 is inserted into the housing hole 124.

In addition, guide holes 146 in which the housing protrusions 128 formed in the lower bent portion of the lamp housing 125 are inserted are formed at both bottom surfaces of the guide panel 140.

According to the above-described structure, the lamp housing 125 of the present invention is coupled in the outer direction of the guide panel 140, it is possible to be easily coupled without conventional bonding means.

In addition, in order to further improve the coupling force between the lamp housing 125 and the guide panel 140, a predetermined screw together with the guide panel 140 in the lower bent portion of the lamp housing 125, that is, the back direction of the liquid crystal display module. It can be connected via the member.

According to the combination of the lamp housing 125, the guide panel 140 has a structure in which all four sides have a closed loop, and when the assembly of the lamp housing 125 is completed during the assembly process of the liquid crystal display module, the guide panel ( An optical member (not shown) such as a light guide plate, a reflective sheet, and a diffusion sheet is mounted in the internal space (I-SPACE) of 140, and the liquid crystal panel (not shown) is seated on the upper portion thereof to assemble the liquid crystal display module. Will complete.

Although not shown in the drawing, a step is formed at three side surfaces of the guide panel 140 so that the optical member mounted in the internal space I-SPACE is mounted inside the stepped portion, and the liquid crystal panel at the top thereof is located at the top of the stepped portion. It is mounted to prevent the optical member and the surface of the liquid crystal panel from contacting each other. Here, a predetermined stopper (not shown) may be provided between the optical member and the liquid crystal panel.

In addition, an adhesive tape having a light shielding function may be provided between the liquid crystal panel and the guide panel 140 to prevent light emitted from the backlight unit from leaking from the outer portion of the liquid crystal panel.

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

100: liquid crystal display device module 110: liquid crystal panel
111, 112: first and second substrates 120: backlight unit
121: LED element 122: lamp substrate
124: housing hole 125: lamp housing
128: housing protrusion 130: optical member
131: light guide plate 132: reflective sheet
133: diffusion sheet 134, 135: prism sheet
140: guide panel 144: guide protrusion
146: guide hole

Claims (10)

A liquid crystal panel;
A backlight unit including at least one optical member including a light guide plate disposed on a rear surface of the liquid crystal panel, and a lamp housing facing one side of the light guide plate and on which a plurality of LED elements are mounted; And
The liquid crystal panel and the optical sheet are seated, the center of the bottom surface is opened, one of the side walls of the four side surface is removed, the guide panel formed with an opening for inserting the lamp housing from the outside
Including,
The guide panel,
The liquid crystal display module of claim 3, wherein a connection portion is formed to connect two side surfaces adjacent to the opening in a front direction, and the connection portion has a guide protrusion inserted into a housing hole formed in an upper bent portion of the lamp housing. The method of claim 1,
The lamp housing,
A liquid crystal display module, characterized in that the cross section is 'c' shaped and the lower bent portion is formed at least longer than the upper bent portion. The method of claim 2,
The lower bent portion,
And a liquid crystal display module arranged in parallel with a bottom surface of the guide panel. The method of claim 3, wherein
The lower bent portion,
An end protruding inwardly of the guide panel and inserted into a guide hole formed in the bottom surface of the guide panel. The method of claim 4, wherein
The lower bent portion,
And at least one screw member fixed to the guide panel in the rear direction. The method of claim 2,
The upper bent portion,
And a housing hole into which a guide protrusion formed at a connecting portion connecting both ends of the guide panel from the front is inserted. The method of claim 1,
The guide panel,
And a center of the bottom surface is opened, and the bottom surface is disposed in parallel with the lower bent portion of the lamp housing. The method of claim 7, wherein
The bottom surface is,
And a guide hole into which the housing protrusion formed in the lower bent portion is inserted. delete The method of claim 1,
The light guide plate,
And a lamp housing mounted inside the guide panel in a state where the lamp housing is coupled to the guide panel.

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