KR102243338B1 - Guide panel and back light unit and liquid crystal display device using the same - Google Patents

Abstract

The present invention relates to a liquid crystal display, and in particular, to provide a guide panel, a backlight unit and a liquid crystal display device using the same, in which upper patterns are formed on a surface to which a light shielding tape is adhered.

Description

GUIDE PANEL AND BACK LIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE USING THE SAME}

The present invention relates to a guide panel for guiding a liquid crystal panel and a liquid crystal display device using the same.

Flat panel displays (FPDs) are used in various types of electronic products including mobile phones, tablet PCs, and notebook computers. Flat panel display devices include a liquid crystal display (LCD), a plasma display panel (PDP), an organic light emitting display device (OLED), and more recently, an electrophoretic display device. (EPD: ELECTROPHORETIC DISPLAY) is also widely used.

Among flat panel displays, liquid crystal displays are currently the most widely commercialized due to the advantages of mass production technology, ease of driving means, and high-definition implementation.

1 is an exemplary view showing a cross section of a general liquid crystal display device.

A typical liquid crystal display device, as shown in FIG. 1, is a reflective plate 11, a light guide plate 12, an optical film part 13, a guide panel 14, a liquid crystal panel 16, a light shielding tape 15, and Includes the illustrated light source.

In recent years, research has been actively conducted to reduce the width of an outer portion (hereinafter, simply referred to as a'bezel') of a liquid crystal display device.

If the width of the bezel is not considered, since there is a margin in the width (B) of the top surface of the guide panel 14 on which the liquid crystal panel 16 is disposed, a light shielding tape attached to the top surface of the guide panel 14 There is also room for the width (A) of (15).

However, when the width of the bezel decreases, the width B of the top surface of the guide panel 14 on which the liquid crystal panel 16 is disposed decreases, so that the light shielding tape 15 attached to the upper surface of the guide panel 14 is reduced. The width (A) of) is also reduced.

In this case, in order to prevent light from leaking in the bezel direction, the light shielding tape 15 attached between the guide panel 14 and the liquid crystal panel 16 may be separated from the guide panel 14. .

In more detail, when the width A of the light-shielding tape 15 attached to the guide panel 14 decreases, the adhesive force between the guide panel 14 and the light-shielding tape 15 decreases, so that the light-shielding tape 15 ) Can be easily separated from the guide panel 14. Accordingly, defects may occur.

The present invention has been proposed in order to solve the above-described problems, and it is an object of the present invention to provide a guide panel, a backlight unit and a liquid crystal display device using the same, in which upper patterns are formed on a surface to which a light shielding tape is adhered.

In the guide panel according to the present invention for achieving the above-described technical problem, a plurality of upper patterns having curves are formed on an upper surface on which the bezel of the liquid crystal panel is disposed, and the upper patterns include a lower end of the liquid crystal panel. A light-shielding tape attached to the surface is attached.

In the backlight unit according to the present invention for achieving the above-described technical problem, a plurality of upper patterns having curves are formed on an upper surface on which a bezel of a liquid crystal panel is disposed, and the upper patterns include a lower end of the liquid crystal panel. A guide panel to which a light shielding tape attached to the surface is attached; And a light source that is guided by the guide panel and emits light.

A liquid crystal display device according to the present invention for achieving the above-described technical problem includes: a liquid crystal panel; A light shielding tape attached to the lower surface of the liquid crystal panel; A plurality of curved upper patterns are formed on an upper surface on which the bezel of the liquid crystal panel is disposed, and the upper patterns include a guide panel to which the light shielding tape is attached; And a light source that is guided by the guide panel and emits light toward the liquid crystal panel.

According to the present invention, since the adhesive force between the guide panel and the light shielding tape is increased, the light shielding tape is not peeled off from the guide panel. Accordingly, a defect in which the liquid crystal panel is separated from the guide panel does not occur.

1 is an exemplary view showing a cross section of a general liquid crystal display device.
2 is an exploded perspective view showing a liquid crystal display according to the present invention.
3 is a perspective view of a liquid crystal display device according to a first embodiment of the present invention.
4 is an exemplary view showing a state in which a light shielding tape is attached to the guide panel viewed from the direction A shown in FIG. 3.
5 is a perspective view of a liquid crystal display device according to a second embodiment of the present invention.
6 is an exemplary view showing a state in which a light shielding tape is attached to the guide panel viewed from the direction A shown in FIG. 5.
7 is a perspective view of a liquid crystal display device according to a third embodiment of the present invention.

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

2 is an exploded perspective view showing a liquid crystal display according to the present invention.

In the liquid crystal display according to the present invention, as shown in FIG. 2, a liquid crystal panel 150, a light shielding tape 170 attached to a lower surface of the liquid crystal panel 150, and a bezel of the liquid crystal panel 150 are A plurality of patterns having curves are formed on the upper surface of the arrangement, and the patterns are guided by the guide panel 140 and the guide panel 140 to which the light shielding tape 170 is attached, and the It includes a light source that emits light toward the liquid crystal panel. In addition to the above configurations, the liquid crystal display device according to the present invention may include a cover bottom 110.

First, the liquid crystal panel 150 includes a liquid crystal injected between the array substrate and the color filter substrate, and outputs an image by controlling the transmission amount of light emitted from the light source unit.

A polarizing film may be attached to the upper and lower surfaces of the liquid crystal panel 150. The polarizing film is attached to at least one of the top surface or the bottom surface of the liquid crystal panel 150 to pass only components in a specific direction among the components of light transmitted through the light guide plate 120. Performs a function.

Next, the light shielding tape 170 is formed in the shape of a square frame, as shown in FIG. 2, and the lower surface of the outer portion of the liquid crystal panel 150 (hereinafter, simply referred to as'bezel') and the guide It is attached to the top surface of the panel 140. The light blocking tape 170 may be formed in various shapes according to the shape of the liquid crystal panel 150.

The light shielding tape 170 prevents the light transmitted from the light source from leaking between the guide panel and the liquid crystal panel, and also prevents the light from leaking through the bezel.

Next, the light source unit is guided by the guide panel 140 and performs a function of irradiating light in a direction perpendicular to the liquid crystal panel 150.

The light source unit is disposed on one side of the guide frame 140, is guided by a light source module 180 that outputs light, and the guide frame 140, and transmits the light output from the light source module 180 to the light source module 180. A light guide plate 120 that advances in the upper direction of the guide frame 140, and is disposed on the upper surface of the light guide plate 120 to diffuse the light output from the light guide plate 120 and irradiate it perpendicularly to the liquid crystal panel 150. The optical sheet part 130, the reflecting plate 160 disposed on the lower surface of the light guide plate 120 and reflecting the light transmitted from the light guide plate 120 toward the light guide plate 120, and the reflecting plate 160 are bonded to each other. , And an adhesive tape (not shown) attached to the lower surface of the guide panel 140.

First, the light source module 180 includes a light source for outputting light and a substrate supporting the light source and supplying power to the light source.

Various types of lamps may be used as the light source, and in particular, a light emitting diode (LED) may be used.

Second, the light guide panel (LGP) 120 is formed of a transparent material, and is manufactured in a plate shape. The light guide plate 120 performs a function of scattering and reflecting light emitted from the light source module 180 and transmitting the light to the liquid crystal panel 150 disposed above the light guide plate.

The light guide plate may be formed of a material such as plastic or resin such as PMMA (polymethylmethacrylate).

Third, the optical sheet unit 130 performs a function of diffusing the light passing through the light guide plate 120 or allowing the light passing through the light guide plate 120 to be vertically incident on the liquid crystal panel 150. .

To this end, the optical sheet unit 130 may be formed in various ways, including a diffuser sheet for diffusing light, a prism sheet for converting light perpendicular to the liquid crystal panel 150, and the like. I can.

Fourth, the reflective plate 160 is disposed on the lower surface of the light guide plate 120 to transmit light output from the light source module 180 and traveling toward the lower end of the light guide plate 120. It performs a function of reflecting in the direction of the liquid crystal panel 150 disposed on the liquid crystal panel 150.

For example, light output from the light source module 180 and flowing into the light guide plate 120 is refracted by a pattern formed on the light guide plate and reflected toward the liquid crystal panel 150. However, there may be light that is not reflected in the direction of the liquid crystal panel 150 and leaks out to the outside through the lower surface of the light guide plate 120. The reflective plate 160 reflects light flowing out through the lower surface of the light guide plate 120 back to the light guide plate 120 and guides the light to the liquid crystal panel 150.

Fifth, the adhesive tape (not shown) performs a function of attaching the reflective plate 160 to the lower surface of the guide panel 140.

However, when the reflective plate 160 is disposed on and fixed to the cover bottom 110, the reflective plate 160 does not need to be attached to the guide panel 140. In this case, the adhesive tape may be omitted.

The guide panel 140 and the light source units 180, 120, 130, and 160 are collectively referred to as a backlight unit.

More specifically, the backlight unit includes the upper patterns formed on an upper surface of the liquid crystal panel 150 on which the bezel is disposed, and the guide to which the light blocking tape 170 is attached to the upper patterns. It is guided by the panel 140 and the guide panel 140 and includes the light source unit emitting light.

In the above description, the edge type light source unit has been described as an example of a light source unit applied to the present invention, but a direct type light source unit may be applied to the present invention.

The direct light source unit may include a light source module disposed on the cover bottom 110 and an optical sheet unit disposed on the top of the light source module.

Next, the cover bottom 110 performs a function of accommodating the above-described components.

In this case, the cover bottom 110 may be coupled to a case top that covers the bezel of the liquid crystal panel 150 to accommodate the components, but may independently accommodate the components without the case top. .

In addition, in the liquid crystal display according to the present invention, the cover bottom 110 may be omitted.

For example, when the backlight unit uses an edge-type light source unit and the reflective plate 160 constituting the light source unit is attached to the lower surface of the guide panel through the adhesive tape, the cover bottom 110 Can be omitted.

Finally, the guide panel 140 is formed in a rectangular frame shape so that the bezel of the liquid crystal panel 150 is disposed. However, the guide panel 140 may be formed in various shapes according to the shape of the liquid crystal panel 150.

A plurality of curved patterns are formed on an upper surface of the guide panel 140 on which the bezel is disposed, and the light blocking tape 170 is attached to the patterns.

The guide panel 140 serves to guide the light source unit.

When there is no cover bottom 110 and the light source is configured in an edge shape, the reflective plate 160 is attached to the lower surface of the guide panel 140 through the adhesive tape.

In this case, a plurality of curved lower patterns are formed on the lower surface of the guide frame 140, and the adhesive tape is attached to the lower patterns.

Detailed functions and configurations of the guide frame 140 will be described in detail below with reference to FIGS. 3 to 6.

3 is a perspective view of a liquid crystal display device according to a first embodiment of the present invention, and in particular, a perspective view showing a cross section cut in the direction X-X' shown in FIG. 4 is an exemplary view showing a state in which a light shielding tape is attached to the guide panel viewed from the direction A shown in FIG. 3. Hereinafter, the same or similar content as described with reference to FIG. 2 will be omitted or briefly described, and in particular, the configuration and function of the guide panel 140 will be described in detail.

In the liquid crystal display according to the first embodiment of the present invention, as shown in FIGS. 2 to 4, the liquid crystal panel 150, the light shielding tape 170, the guide panel 140, and the light source unit 190 ).

First, the guide panel 140 according to the present invention is formed in the shape of a square frame so that the bezel of the liquid crystal panel 150 is disposed. However, as described above, the guide panel 140 may be formed in various shapes according to the shape of the liquid crystal panel 150. The bezel refers to an outer portion of the liquid crystal panel 150, and an image is not output from the bezel.

Second, among the guide panel 140, a plurality of upper patterns 141 having curves are formed on an upper surface TS of the liquid crystal panel 150 on which the bezel is disposed.

The upper patterns 141 may be formed in a rounded shape like a wave pattern. For example, the upper patterns 141 may be formed in a semicircular shape, as shown in FIGS. 3 and 4.

Third, the light shielding tape 170 attached to the lower surface of the liquid crystal panel 150 is attached to the upper patterns 141.

The light shielding tape 170 is, for example, as shown in FIG. 4, a base film 171, a first adhesive 172 attached to the first surface of the base film 171, and having adhesiveness And a second adhesive 173 attached to the second surface of the base film 171 and having adhesiveness. In this case, the first adhesive 172 is attached to the bezel of the lower surface of the liquid crystal panel 150, and the second adhesive 173 is attached in close contact with the surfaces of the upper patterns 141.

The light-shielding tape 170 may be formed by coating acrylic adhesives 172 and 173 on both sides of the base film 171 made of, for example, polyethylene terephthalate (PET) resin.

The light blocking tape 170 may be formed to a thickness of several tens of µm.

When the base film 171 is formed of a transparent material, a black ink layer may be formed on at least one of the first and second surfaces.

The light blocking tape 170 prevents the light output from the light source module 180 from leaking between the guide panel 140 and the optical sheet 130.

Since the light blocking tape 170 is disposed along the bezel of the liquid crystal panel 150, it may be formed in a rectangular frame shape, but may be formed in various shapes according to the shape of the liquid crystal panel 150.

Fourth, since the upper patterns 141 formed on the upper surface TS are formed to be curved, the area W2 of the surface of the upper patterns 141 is the upper surface TS when the upper surface TS is flat. It is larger than the area W1 of the top surface TS.

Since the area of the top surface TS is larger than that of the prior art, the area in which the light shielding tape 170 and the top surface TS contact becomes larger. Accordingly, the adhesive force between the top surface TS and the light blocking tape 170 may be increased more than the conventional one.

Fifth, when the reflective plate 160 constituting the light source unit 190 is attached to the lower surface of the guide panel 140 through the adhesive tape 200, the lower surface of the guide panel 120 is curved A plurality of bottom patterns (not shown) may be formed.

The adhesive tape 200 attached to the reflective plate 160 is attached to the lower patterns.

To further explain, a plurality of bottom patterns having a bend may be formed on the bottom surface of the guide frame 120, and in this case, the reflection plate constituting the light source unit 190 ( The adhesive tape 200 adhered to 160 may be attached.

The lower patterns may be formed in the same shape as the upper patterns 141 or may be formed in different shapes.

Since the area of the bottom surface is increased by the bottom patterns, an area in which the bottom surface and the adhesive tape 200 contact becomes larger. Accordingly, the adhesive force between the lower surface and the adhesive tape 200 may be increased more than the conventional one.

5 is a perspective view of a liquid crystal display device according to a second exemplary embodiment of the present invention, and in particular, a perspective view showing a cross section cut in the direction X-X′ shown in FIG. 2. 6 is an exemplary view showing a state in which a light shielding tape is attached to the guide panel viewed from the direction A shown in FIG. 5.

In the liquid crystal display according to the second embodiment of the present invention, as shown in FIGS. 2, 5 and 6, the liquid crystal panel 150, the light shielding tape 170, the guide panel 140, and the It includes a light source unit 190.

The configuration and function of the guide panel 140 are the same as the configuration and function of the guide panel 140 applied to the liquid crystal display according to the first embodiment of the present invention.

In this case, the upper patterns 141 formed on the upper surface TS of the guide panel 140 applied to the second embodiment of the present invention may be formed in a shape having a certain angle, such as a sawtooth pattern. have.

For example, the upper patterns 141 may be formed in a triangular shape, as shown in FIGS. 5 and 6.

Since the top patterns 141 formed on the top surface TS are formed to be curved in a triangular shape, the area W2 of the surface of the top patterns 141 is when the top surface TS is flat. It is larger than the area W1 of the top surface TS.

Since the area of the top surface TS is larger than that of the prior art, the area in which the light shielding tape 170 and the top surface TS contact becomes larger. Accordingly, the adhesive force between the top surface TS and the light shielding tape 170 may be increased more than the conventional one.

In addition, when the reflective plate 160 constituting the light source unit 190 is attached to the lower surface of the guide panel 140 through the adhesive tape 200, the lower surface of the guide panel 120 is curved A plurality of bottom patterns (not shown) may be formed.

7 is a perspective view of a liquid crystal display device according to a third exemplary embodiment of the present invention, and in particular, a perspective view showing a cross section cut in the direction X-X' shown in FIG. 2.

A liquid crystal display according to a third exemplary embodiment of the present invention includes the liquid crystal panel 150, the light shielding tape 170, the guide panel 140, and the light source unit 190, as shown in FIGS. 2 and 7. ).

The configuration and function of the guide panel 140 are the same as the configuration and function of the guide panel 140 applied to the liquid crystal display according to the first embodiment of the present invention.

In this case, the upper pattern 141 formed on the upper surface TS of the guide panel 140 applied to the third embodiment of the present invention is a groove 141b recessed from the upper surface TS. And protrusions 141 a protruding from the top surface TS.

Since the top patterns 141 formed on the top surface TS are formed to be curved in a groove or protrusion shape, the area W2 of the surface of the top patterns 141 is flat. It is larger than the area W1 of the top surface TS in the case.

Since the area of the top surface TS is larger than that of the prior art, the area in which the light shielding tape 170 and the top surface TS contact becomes larger. Accordingly, the adhesive force between the top surface TS and the light shielding tape 170 may be increased more than the conventional one.

The shapes of the top patterns 141 may be formed in various shapes that can increase the surface area of the top surface TS, in addition to the shapes described above.

In addition, when the reflective plate 160 constituting the light source unit 190 is attached to the lower surface of the guide panel 140 through the adhesive tape 200, the lower surface of the guide panel 120 is curved A plurality of bottom patterns (not shown) may be formed.

In this case, the shapes of the bottom patterns may also be formed in various shapes that can increase the surface area of the bottom surface in addition to the shapes described above.

The features of the present invention described above are summarized as follows.

As the bezel of the liquid crystal display device becomes narrower, the width of the guide panel constituting the liquid crystal display device is also narrowing. Due to the narrower width of the guide panel, it is difficult to completely adhere the liquid crystal panel and the guide panel by the light-shielding tape, and thus, the light-shielding tape is peeled off from the guide panel.

According to the present invention, by increasing the attachment area of the light shielding tape 170 attached to the guide panel 140, the phenomenon in which the light shielding tape 170 is peeled from the guide panel 140 may be improved.

For example, by forming a plurality of curved upper patterns 141 on the upper surface TS of the guide panel 140 to which the light blocking tape 170 is attached, the As the attachment surface of the light-shielding tape 170 is increased, the adhesive force between the guide panel 140 and the light-shielding tape 170 may be increased. Accordingly, a phenomenon in which the light shielding tape 170 is peeled off from the guide panel 140 and the liquid crystal panel 150 is separated from the guide panel 140 may be improved.

The upper patterns 141 may be formed on the guide panel 140 through a mold process in which the guide panel 140 is manufactured, or a separate surface treatment after the guide panel 140 is manufactured It may be formed on the guide panel 140 through a process.

In more detail, the strength of the adhesion of the light-shielding tape 170 is proportional to the size of the surface area in which the light-shielding tape 170 and the guide panel 140 contact each other. That is, as the size of the surface area in which the light shielding tape 170 and the guide panel 140 contact is increased, the adhesive force between the light shielding tape 170 and the guide panel 140 increases. According to the present invention, the size of the surface area in which the light shielding tape 170 and the guide panel 140 contact with each other is increased by the upper patterns 141, and accordingly, the light shielding tape 170 and the guide The adhesion of the panel 140 is increased. Accordingly, even if the width of the guide panel 140 is narrowed, the light shielding tape 170 is peeled off from the guide panel 140 and the liquid crystal panel 150 is separated from the guide panel 140. Does not occur.

In particular, according to the present invention, the adhesion between the guide panel 140 and the light shielding tape 170 is increased within a limited width of the guide panel 140, without changing the structure and material of the light shielding tape 170 Accordingly, the light shielding tape 170 is peeled off from the guide panel 140 and the liquid crystal panel 150 is not separated from the guide panel 140.

In addition, according to the present invention, the adhesive force between the adhesive tape 200 and the guide panel 140 is attached to the lower surface of the guide panel 140 to attach the reflector 160 to the guide panel 140 It can also be increased.

For example, in the case of a liquid crystal display without a cover bottom, the reflective plate 160 is attached to the lower surface of the guide panel 140 through the adhesive tape 200.

In this case, lower patterns having the same or similar shape as the upper patterns 141 may be formed on the lower surface of the guide panel 140.

Due to the lower patterns, the size of the surface area in which the guide panel 140 and the adhesive tape 200 contact is increased, and accordingly, the adhesive force between the adhesive tape 200 and the guide panel 140 is increased. Therefore, the adhesive tape 200 is peeled off from the guide panel 140, so that the reflective plate 160 is not separated from the guide panel 140.

Those skilled in the art to which the present invention pertains will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting. The scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

110: cover bottom 120: light guide plate
130: optical sheet part 140: guide panel
150: liquid crystal panel 160: reflector
170: shading tape 180: light source module
141: upper pattern TS: upper surface
190: light source 200: adhesive tape

Claims (7)

Liquid crystal panel;
A light shielding tape attached to the lower surface of the liquid crystal panel;
A plurality of curved upper patterns are formed on an upper surface on which the bezel of the liquid crystal panel is disposed, and the upper patterns include a guide panel to which the light shielding tape is attached; And
It is guided by the guide panel and includes a light source unit that emits light in the direction of the liquid crystal panel,
The top patterns include grooves recessed from the top surface and protrusions protruding from the top surface,
The light shielding tape,
Base film;
A first adhesive attached to the first surface of the base film and having adhesiveness; And
It is attached to the second surface of the base film and includes a second adhesive having adhesiveness,
The first adhesive is attached to the lower surface of the liquid crystal panel,
The second adhesive is attached to the upper patterns,
The first surface of the base film is attached to the top surface, the grooves, and the surfaces of the protrusions by the first adhesive,
The area of the surface of the guide panel on which the upper patterns are formed is increased than the area of the surface of the guide panel on which the upper patterns are not formed,
The light blocking tape is attached to the top surface along the curves of the top patterns,
The area in which the light-shielding tape contacts the guide panel on which the upper patterns are formed is increased than the area in which the light-shielding tape contacts the guide panel on which the upper patterns are not formed,
A liquid crystal display device in which a plurality of bottom patterns having curves are formed on a bottom surface of the guide panel, and an adhesive tape adhered to a reflector constituting the light source unit is attached to the bottom patterns. The method of claim 1,
The light source unit,
A light source module disposed on one side of the guide panel and outputting light;
A light guide plate guided by the guide panel and configured to propagate the light output from the light source module toward an upper end of the guide panel;
The reflecting plate disposed on a lower surface of the light guide plate to reflect light transmitted from the light guide plate toward the light guide plate; And
And the adhesive tape adhered to the reflector and attached to the lower surface of the guide panel,
A liquid crystal display device on which the lower patterns are formed on a lower surface of the guide panel, and the adhesive tape is attached to the lower patterns. The method of claim 1,
A liquid crystal display device further comprising a cover bottom accommodating the liquid crystal panel, the light blocking tape, the guide panel, and the light source unit.
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