KR20190014961A - Display device - Google Patents

Abstract

According to the present invention, a display device comprises: a light source module including a light source which emits light and a board on which the light source located; a light guide plate guiding the incident light from the light source to a light exit surface; and at least one fixing unit formed to be extended from the light guide plate. A mismatch between the light source and the light guide plate due to an external force can be prevented by preventing the movement of the light guide plate.

Description

Display device {DISPLAY DEVICE}

The present invention relates to a display device, and more particularly, to a display device capable of aligning and fixing a light guide plate to a light source module so that light is incident on a light guide plate from a light source.

A display device such as a TV, a monitor and the like is provided with a display panel for displaying an image, thereby displaying a broadcast signal or image data of various formats. Such a display panel is implemented in various forms such as a liquid crystal panel and a plasma panel, and is applied to various display devices. Here, when the panel itself can not generate light, such as a liquid crystal display panel, the display device has a backlight unit that supplies light to the panel.

BACKGROUND ART Generally, a liquid crystal display (LCD) is one of the most widely used display panels, and is composed of two substrates on which electrodes are formed and a liquid crystal layer interposed therebetween, And adjusting the amount of light transmitted by rearranging the liquid crystal molecules of the layer.

A liquid crystal display device includes a thin film transistor (TFT) substrate, a color filter substrate opposed to the thin film transistor substrate, and a liquid crystal layer interposed between the two substrates, do.

The liquid crystal display includes a liquid crystal panel assembly having a liquid crystal, and a backlight unit for providing light to the liquid crystal.

The backlight unit includes a light source unit, a light guide plate, an optical sheet, a cover bottom, and the like. The light source module is disposed on the back surface of the liquid crystal panel, and direct light is transmitted to the back surface of the liquid crystal panel. Is disposed on at least one lateral side of the light guide plate, and is divided into an edge type in which light is transmitted to the liquid crystal panel through the light guide plate.

In the edge system, a light guide plate is disposed on a side surface of the light source unit, and light emitted from the light source unit is incident on the light guide plate to supply light to the liquid crystal panel assembly. However, when the cover bottom is deformed due to an external force, , The flow of the light guide plate may occur, resulting in incompatibility between the light source and the light guide plate. In this case, the light generated in the light source unit is guided to the optical sheet through the light guide plate and can not be uniformly spread, and is concentrated in some areas, and can be seen as a light in the liquid crystal display device.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to prevent misalignment between a light source part and a light guide plate by external force, thereby improving light defects and improving productivity.

In order to achieve the above-mentioned object, a display device includes a light source module including a light source that emits light and a substrate that supports the light source, and a light guide module that guides the light incident from the light source to an exit surface, A light guide plate having at least one fixed portion extending therefrom, and a cover bottom having an outer frame bent in a direction perpendicular to the light source module and the light guide plate.

According to the present invention, the fixing portion on one side of the light guide plate is inserted into the groove formed in the lower portion of the side wall of the cover bottom, or the additional fixing portion is formed on the region overlapping the guide panel in the direction parallel to the liquid crystal panel assembly, So that it is possible to prevent the mismatch of the light source and the light guide plate.

1 is an exploded perspective view showing a display device according to an embodiment of the present invention.
FIG. 2 is a plan view of a cover unit, a light source module, a light guide plate, and a light shielding tape of a display device according to an embodiment of the present invention.
3A to 3C are sectional views of a display device according to an embodiment of the present invention.
4A to 4D are views showing the structure of a light guide plate including a first fixing part and a second fixing part in a display device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. However, it is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification. The dimensions and relative sizes of the layers and regions in the figures may be exaggerated for clarity of illustration.

It will be understood that when an element or layer is referred to as being another element or " on " or " on ", it includes both intervening layers or other elements in the middle, do. On the other hand, when a device is referred to as " directly on " or " directly above ", it does not intervene another device or layer in the middle.

The terms spatially relative, "below," "lower," "above," "upper," and the like, And may be used to easily describe the correlation with other elements or components. Spatially relative terms should be understood to include, in addition to the orientation shown in the drawings, terms that include different orientations of the device during use or operation. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element. Thus, the exemplary term " below " can include both downward and upward directions.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the components from other components, and the terms do not limit the nature, order, order, or number of the components.

1 is an exploded perspective view according to an embodiment of the present invention.

Referring to FIG. 1, a display device according to the present embodiment includes a liquid crystal panel assembly 200 and a backlight unit 300.

The liquid crystal panel assembly 200 includes a liquid crystal panel 210, a driver IC (Integrated Chip) 220, and a printed circuit board 230.

The liquid crystal panel 210 displays an image using the characteristics of the liquid crystal whose alignment direction changes in response to the drive signal. The liquid crystal panel 210 includes a first substrate 212, a second substrate 211, and a liquid crystal layer (not shown).

The first substrate 212 has a transparent pixel electrode and a voltage applying device for applying a pixel voltage to the pixel electrode. In general, a black matrix, a color filter, and a common electrode may be formed on the first substrate 212. The common electrode is formed on the first substrate 212 in a vertical electric field driving method such as a TN (Twisted Nematic) mode and a VA (Vertical Alignment) mode. The common electrode is divided into an IPS (In Plane Switching) mode, an FFS (Fringe Field Switching) May be formed on the second substrate 211 together with the pixel electrode in the same horizontal field driving scheme. Further, in the case where the color filter is formed together with the thin film transistor, a color filter may be formed on the second substrate 211. A polarizing plate 240 is attached to the upper surface of the first substrate 212 and an alignment film (not shown) is formed on the inner surface of the first substrate 212 in contact with the liquid crystal to set a pretilt angle of the liquid crystal.

A plurality of data lines and a plurality of gate lines cross the second substrate 211. Liquid crystal cells in the liquid crystal layer are arranged in a matrix form in the liquid crystal panel 210 by the intersection structure of the data lines and the gate lines. A thin film transistor (TFT), a pixel electrode of a liquid crystal cell connected to a thin film transistor (TFT), a storage capacitor, and the like are formed on the second substrate 211. The liquid crystal cells are driven by an electric field generated by a potential difference between a data voltage supplied to the pixel electrode through the data lines and a common voltage supplied to the common electrode, thereby adjusting the light incident through the liquid crystal panel 210.

The driving circuit IC 220 for determining the application timing of the driving signal may be attached to the source side and the gate side of the first substrate 212 and the driving circuit IC on the gate side may be formed inside the liquid crystal panel 210. The driving circuit IC 220 is connected to the printed circuit board 230 and the first substrate 212 to electrically connect the printed circuit board 230 and the first substrate 212.

The printed circuit board 230 provides a driving signal to the liquid crystal panel 210.

A polarizer 240 is formed on the upper surface of the liquid crystal panel 210 to polarize the light transmitted through the liquid crystal panel 210 and to protect the liquid crystal panel 210 from scratches or the like. The printed circuit board 230 electrically connected to the first substrate 212 of the liquid crystal panel 210 is attached to the backside of the cover bottom 360 and the cover shield 380 covers the printed circuit board 230 So that the elements on the printed circuit board 230 are prevented from being broken and the electromagnetic waves generated from the printed circuit board 230 can be prevented from being diverted to the outside.

The backlight unit 300 includes a light source module 310, a guide panel 320, a light guide plate 330, optical sheets 340, a reflective sheet 350, and a cover bottom 360.

The light source module 310 is disposed on a side surface of the light guide plate 330 and the light source 312 of the light source module 310 functions to provide light to the light guide plate 330. A light source of such an edge type can mainly use a light emitting diode as in the embodiment of the present invention, and in the case of a lamp, a cold or hot cathode fluorescent lamp can be used.

FIG. 2 is a plan view of a cover unit 360, a light source module 310, a light guide plate 330, and a light shielding tape 370 of a display device according to an embodiment of the present invention. FIGS. Sectional view of a display device according to an embodiment.

2 and 3A to 3C, the light guide plate 330 changes the path of the light incident from the light source module 310 and distributes the light more uniformly, A first fixing part 331 and a second fixing part 332 are formed on one side of the light guide plate 330 facing the light source module 310 to prevent the light guide plate 330 from flowing due to external force, .

The first fixing part 331 is formed to extend from the light guide plate 330 so as to form a step in the direction of the liquid crystal panel 210 to prevent the light guide plate 330 from being mismatched with the light source module 310 due to the flow of the light guide plate 330. Since the first fixing part 331 is formed to fill the gap between the light guide plate 330 and the guide panel 320, the flow of the light guide plate 330 can be effectively prevented even if an external force is applied. A part of the optical sheets 340 positioned in the non-display area for forming the first fixing parts 331 can be cut.

The upper surface of the first fixing part 331 may be formed to be in contact with the lower surface of the guide panel 320 in a direction parallel to the liquid crystal panel 210 and may be formed so as to have an interval of less than 0.1 mm do. The first fixing part 331 may be formed to have a width of at least 2 mm or more in the minor axis direction in order to secure rigidity so as to avoid breakage or breakage when an external force is applied. 210 and the guide panel 320 in a direction parallel to the guide panel 320.

The light shielding tape 370 prevents the light emitted from the light source module 310 from leaking through a minute gap between the first fixing portion 331 of the light guide plate 330 and the guide panel 320. The light shielding tape 370 is attached to the side surface of the first fixing portion 331 facing the light source module 310 and the length of the light shielding tape 370 is equal to or greater than the height of the first fixing portion 331 It can be long. The shielding tape 370 may be adhered to the guide panel 320 so as to fix the first fixing part 331 and the guide panel 320 together.

The second fixing part 332 is formed to extend from the one side wall of the light guide plate 330 opposite to the light source module 310 to form a step. A cover bottom 360 coupled to the second fixing part 332 is formed on a bottom surface of the LCD device and an outer frame part of the cover bottom 360 is formed in a vertical direction in which the light source module 310 and the light guide plate 330 are opposed to each other As shown in Fig. In other words, the outer portion of the cover bottom 360 is formed by bending in the vertical direction with respect to the liquid crystal panel 210.

The second fixing portion 332 is formed to have a thickness of at least 0.5 mm or more for securing rigidity so as to prevent breakage or breakage when an external force is applied. The second fixing portion 332 is formed to be inserted into the groove formed in the cover bottom 360 at a depth of at least 0.5 mm or more to prevent the vertical fixing portion 332 from slipping out due to horizontal flow.

The light source module 310 is formed at one side of the groove formed in the cover bottom 360 so that the lower side of the light source module 310 is in contact with the upper side of the second fixing portion 332, Sided tape 390 can be attached and fixed between the light source module 310 and the second fixing part 332 in order to prevent misalignment due to the tolerance in the formation of the light source module 310. [

As shown in FIG. 3A, the first fixing part 331 and the second fixing part 332 may be formed simultaneously, and may be separately formed as shown in FIGS. 3B and 3C. The light guide plate 330 facing the light source module 310 except for the first fixing portion 331 blocked by the shielding tape 370 and the second fixing portion 332 contacting the lower surface of the light source module 310, The height of one side wall of the light source module 310 may be substantially the same as the distance between the upper side and the lower side of the light source module 310. This is to allow all the light emitted from the light source module 310 to be incident on the light guide plate 330. The first fixing part 331 and the second fixing part 332 may be made of the same material as the light guide plate 330.

The first fixing part 331 and the second fixing part 332 are formed so as to align the light source module 310 and the light guide plate 330 even if they are formed simultaneously or separately as shown in FIGS. 3A, 3B and 3C. Even if only one of the first fixing part and the second fixing part is selectively formed, a sufficient effect of preventing the flow of the light guide plate 330 due to the external force can be obtained, so that the mismatching of the light source module 310 and the light guide plate 330 can be avoided .

The light guide plate 330 is made of a material having a good refractive index and transmittance, for example, polymethyl methacrylate (PMMA), polycarbonate (PC), or polyethylene (PE). A light scattering pattern is formed on the bottom surface of the light guide plate to guide light incident from the side surface of the light guide plate upward. Examples of the method of forming such a scattering pattern include a method of applying a scattering material to the bottom surface of the light guide plate and patterning the scattering material, and a method of imparting a constant curvature to the bottom surface of the light guide plate. In the drawing, a planar light guide plate is mainly used for a liquid crystal display device requiring high brightness. However, it is needless to say that the present invention is not limited thereto, and it is needless to say that an inclined light guide plate which is mainly used in a liquid crystal display device which requires a small size and a small size is also possible.

The reflective sheet 350 is disposed on the lower surface of the light guide plate 330 and reflects light emitted to the lower portion of the light guide plate 330 upward. The reflective sheet 350 is disposed on the lower surface of the light guide plate 330 and reflects light not reflected by the minute dot pattern on the back surface of the light guide plate 330 toward the exit surface of the light guide plate 330, And to improve the uniformity of the light transmitted through the light exit plane of the light guide plate 330. [

The reflective sheet 350 is extended in a direction parallel to the liquid crystal display panel 210 so as to correspond to the second fixing portion 332 and is formed with a groove formed on the cover bottom 360 together with the second fixing portion 332. [ Lt; / RTI > In this case, it is possible to prevent not only the flow of the light guide plate 330 but also the flow of the reflection sheet 350, and further, all the light leaking toward the lower surface of the light guide plate 330 can be reflected toward the exit surface of the light guide plate 330 .

The optical sheets 340 are installed on the upper surface of the light guide plate 330 to diffuse and condense light transmitted from the light guide plate 330. The optical sheets 340 include a diffusion sheet, a prism sheet, a protective sheet, and the like.

The diffusion sheet positioned between the light guide plate 330 and the prism sheet disperses the light incident from the light guide plate 330, thereby preventing the light from being partially concentrated. The prism sheet is formed of a prism sheet having a regular arrangement of triangular prisms on its upper surface. Normally, the prism sheet is composed of two sheets, and the prism arrangements are arranged so as to stagger each other at a predetermined angle, And collects light in a direction perpendicular to the panel 210.

As a result, the light passing through the prism sheet proceeds substantially vertically, and the luminance distribution on the protective sheet is uniformly obtained. The protective sheet formed on the prism sheet not only serves to protect the surface of the prism sheet but also diffuses the light to uniform the distribution of light. In addition, the optical sheets 340 can be partially cut out of the optical sheets 340 located in the non-display area for forming the first fixing parts 331. [

4A to 4D are views showing the structure of a light guide plate 330 including a first fixing part 331 and a second fixing part 332 in a display device according to an embodiment of the present invention.

4A and 4B, the first fixing part 331 and the second fixing part 332 extended from the light guide plate 330 may be connected in a long length or may be divided into an island shape Can be formed repeatedly. 4C and 4D, the shapes of the first fixing portion 331 and the second fixing portion 332 can be formed in combination as required.

The first fixing part 331 is formed between the guide panel 320 and the light guide plate 330 to prevent the light source module 310 from being misaligned with the light guide plate 330 by suppressing upward and downward flow due to external force. The first fixing part 331 may be repeatedly formed in an island shape but may be formed as long as possible in order to prevent leakage of light between the guide panel 320 and the light guide plate 330, 370). The shielding tape 370 may be formed to adhere to the guide panel 320 so as to be adhered to the guide panel 320 to fix the guide panel 320 to the first fixing part 331.

When the second fixing part 332 is repeatedly formed in an island shape, the light source module 310 and the light guide plate 330 according to the left and right flow as well as the upward and downward flows when fastened to the groove formed in the cover bottom 360, Can be prevented more effectively.

When the first fixing part 331 or the second fixing part 332 is repeatedly formed in an island shape, it is most effective to form the light source module 310 corresponding to the area where the light source is located, Even if the first fixing portion 331 or the second fixing portion 332 is divided into island shapes and repeatedly formed, it is not necessarily coincident with the number of light sources.

The features, structures, effects and the like described in the foregoing embodiments are included in at least one embodiment of the present invention and are not necessarily limited to one embodiment. Further, the features, structures, effects, and the like illustrated in the embodiments may be combined or modified in other embodiments by those skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the present invention. It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments may be modified and implemented. It is to be understood that the present invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof.

100: liquid crystal display device 200: liquid crystal panel assembly
300: backlight unit 310: light source module
320: guide panel 330: light guide plate
331: first fixing portion 332: second fixing portion
340: optical sheets 350: reflective sheet
370: Shading tape 380: Cover shield

Claims (12)

A light source module comprising a light source and a light source plate for emitting light;
A light guide plate for guiding the light incident from the light source to the exit surface;
At least one fixing part extending from the light guide plate to fix the light guide plate so as to be aligned with the light source module; And
And a light emitting diode (LED)
.
The method according to claim 1,
Wherein the at least one fixing portion is a first fixing portion formed by extending a step on a light exit surface of the light guide plate, or a second fixing portion extending stepwise on a side surface.
3. The method of claim 2,
And a guide panel superimposed on the outer surface of the light exit surface of the light guide plate,
Wherein the first fixing portion is configured to overlap with the guide panel.
The method of claim 3,
And an upper surface of the first fixing portion is in contact with a lower surface of the guide panel.
The method of claim 3,
Wherein the first fixing portion is smaller than the overlapping region with the guide panel, but has a width of 2 mm or more.
3. The method of claim 2,
Wherein at least one groove is formed on the curved side wall of the cover bottom and the second fixing part formed to extend to the side of the light guide plate is inserted into the at least one groove.
The method according to claim 6,
And an upper surface of the second fixing part is in contact with a lower surface of the light source module.
8. The method of claim 7,
Wherein the light source module and the second fixing portion are fixed using a double-sided tape.
9. The method of claim 8,
Wherein the light guide plate further includes a reflective sheet under the light guide plate, and the reflective sheet extends in the same manner as the second fixing portion and is inserted together in the at least one groove.
10. The method of claim 9,
And the second fixing portion is formed to a thickness of 0.5 mm or more.
11. The method of claim 10,
And the second fixing portion is formed to correspond to a position where the light source is formed.
3. The method of claim 2,
And a shielding tape attached to a side surface of the first fixing portion.

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