KR20150063836A - Liquid crystal display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device, comprising: a liquid crystal panel; a backlight unit including light sources arranged on the side, and located at the rear of the liquid crystal panel; a cover bottom unit covering the rear and the side of the backlight unit; and a light leaking preventing means formed along at least one inner surface of the cover bottom unit, and preventing light leakage generated between at least one inner surface of the cover bottom unit and the side of the backlight unit. Accordingly, a liquid crystal display device which is light and thin and has a narrow bezel can be implemented. Also, light leakage which may occur between a display area and a non-display area can be prevented.

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

The present invention relates to a liquid crystal display, and more particularly to a liquid crystal display having a narrow bezel.

In recent years, the display field has been rapidly developed in accordance with the information age. In response to this trend, a display device having advantages of thinning, light weight, and low power consumption has been developed, such as a liquid crystal display device (LCD) And organic light emitting diode (OLED) display devices have been widely used with excellent performance.

Here, a liquid crystal display device (LCD), which is advantageous for moving picture display and has a large contrast ratio and is actively used for a TV, a monitor, a mobile phone, etc., has optical anisotropy and polarization The principle of image realization by polarization is shown.

Such a liquid crystal display device has a liquid crystal panel in which a liquid crystal panel is interposed between two adjacent substrates through a liquid crystal layer as an essential component and changes the alignment direction of the liquid crystal molecules in an electric field in the liquid crystal panel to realize a difference in transmittance do.

However, since the liquid crystal panel does not have its own light emitting element, a separate light source is required to display the difference in transmittance as an image. To this end, a backlight unit having a light source is disposed on the back of the liquid crystal panel.

Here, the backlight unit is divided into a direct type and an edge type according to the position of a light source. In a direct-type backlight unit, a light source is disposed below a liquid crystal panel, The backlight unit of the side type system has a structure in which a light guide plate is disposed under the liquid crystal panel and a light source is disposed on at least one side of the light guide plate so that light emitted from the light source is reflected indirectly To the liquid crystal panel.

At this time, the side-type backlight unit has a merit that it can reduce the number of LEDs as well as slim down the thickness of the entire liquid crystal display device and is widely used.

Such a liquid crystal panel and a backlight unit are modularized into a liquid crystal display module by a top cover, a support main and a cover bottom.

In recent years, the liquid crystal display has been widely used in various fields such as a portable computer, a desktop computer monitor, a wall-mounted television, etc. to have a wide display area and to realize a liquid crystal display device having a lightweight, thin and narrow bezel Research has been progressing actively, but there is a problem that there are too many components to modularize a liquid crystal display device.

In addition, each of the components modularizing the liquid crystal display device protects and accommodates the liquid crystal panel and the backlight unit, as well as prevents undesirable light leakage related to visibility, which makes it difficult to easily reduce components.

In particular, in the case of the support main, since the liquid crystal panel and the backlight unit are distinguished from each other and the light leakage phenomenon occurring at the side of the backlight unit is prevented, there is a problem that it is difficult to omit.

An object of the present invention is to provide a liquid crystal display device having a narrow bezel, which is lightweight and thin, by minimizing components that modularize the liquid crystal display device while preventing light leakage.

According to an aspect of the present invention, there is provided a liquid crystal display comprising: a liquid crystal panel; A backlight unit disposed on a rear surface of the liquid crystal panel, the backlight unit including a light source disposed on a side surface; A cover bottom portion covering the back surface and the side surface of the backlight unit and a light leakage preventing member provided along at least one inner side surface of the cover bottom portion to prevent light leakage generated between at least one inner side surface of the cover bottom portion and a side surface of the backlight unit. Means.

Here, the cover bottom portion may include a first cover bottom portion in the form of a rectangular plate, and a second cover bottom portion including a horizontal portion overlapping the first cover bottom portion and a vertical portion perpendicular to the horizontal portion.

The light leakage prevention means is characterized by comprising a first portion having a reflectivity higher than that of the first portion and a second portion having a reflectivity higher than that of the first portion.

Here, the first portion may be white or gray, and the second portion may be black.

The liquid crystal display according to the present invention further includes a light guide plate facing the light source, wherein the first portion has a first height corresponding to the thickness of the light guide plate, the second portion has a second height, The light leakage preventing means is formed to cover at least one inner side surface of the cover bottom portion.

The liquid crystal panel is divided into a display region for displaying an image and a non-display region for light-shielding the display region. The light reflected by the first portion is incident on a side surface of the light guide plate, And the light is emitted to the outside through the display area of the panel, and some light reflected by the second part is blocked by the non-display area.

The liquid crystal panel may further include adhesive means for fixing the liquid crystal panel to the rear edge of the liquid crystal panel.

The adhesive means is partly attached between the back edge of the liquid crystal panel and the cover bottom portion corresponding thereto and the remaining portion is attached along the outer surface of the cover bottom portion by being bent at a right angle in the lateral direction of the cover bottom portion .

The adhesive means is characterized by being black.

As described above, according to the liquid crystal display device according to the embodiment of the present invention, the components are minimized by omitting the conventional top cover and the support main body, thereby realizing the lightweight and thin type and minimizing the width of the non- . In addition, omitting the components makes it possible to reduce the component cost.

Particularly, light leakage preventing means is provided on the inner surface of the cover bottom portion to prevent light leakage on the side surface of the backlight unit, which may be generated by omitting the support main.

1 is a cross-sectional view illustrating a liquid crystal display device according to an embodiment of the present invention;
FIG. 2 is a perspective view showing the backlight unit and the cover bottom of FIG. 1; FIG.
3 is an enlarged cross-sectional view of the AB region in the liquid crystal display device of FIG.
4 is a view illustrating a light leakage prevention in a liquid crystal display device according to an embodiment of the present invention.
5A is a front view showing another example of light leakage preventing means according to the embodiment of the present invention.
5B is a cross-sectional view showing another example of light leakage preventing means according to the embodiment of the present invention.
6 is a cross-sectional view showing another example of a liquid crystal display device according to an embodiment of the present invention.

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

FIG. 1 is a cross-sectional view showing a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a perspective view showing a backlight unit and a cover bottom in FIG. 1, And FIG. 4 is a view illustrating the light leakage prevention in the liquid crystal display device according to the embodiment of the present invention.

The liquid crystal display 100 includes a liquid crystal panel 110 and a backlight unit 120 and a cover bottom part 150 for modularizing the liquid crystal panel 110 and the backlight unit 120.

The liquid crystal panel 110 is a part that plays a key role in image display and is composed of a first substrate 112 and a second substrate 114 which are bonded to each other with a liquid crystal layer interposed therebetween.

Here, the first and second substrates 112 and 114 may be divided into a display area DA for realizing an image and a non-display area NDA for displaying a display area DA and not embodying an image.

First and second polarizers 119a and 119b, which selectively transmit only specific light, are attached to both outer sides of the first and second substrates 112 and 114, respectively.

A non-display area NDA is formed in the non-display area NDA of the first substrate 112, the second substrate 114, or both of the first substrate 112 and the second substrate 114, The light shielding treatment for shielding the light leakage phenomenon can be performed. The light-shielding process may be provided in the form of a light-shielding pattern or a light-shielding tape, for example, between the first polarizer 119a and the first substrate 112 or between the second polarizer 119b and the second substrate 114 And may be provided both between the first polarizing plate 119a and the first substrate 112 and between the second polarizing plate 119b and the second substrate 114. [

On the other hand, on the inner surface of the first substrate 112, which is generally called a lower substrate or an array substrate, a plurality of gate lines and data lines intersect with each other to define pixels, and a thin film transistor (TFT) TFTs) are connected in a one-to-one correspondence with the transparent pixel electrodes formed in the respective pixels.

On the inner surface of the second substrate 114 called an upper substrate or a color substrate, a color filter of red (R), green (G), and blue (B) A black matrix for covering non-display elements such as a gate line, a data line and a thin film transistor, and a transparent common electrode covering the gate lines and the data lines. Here, the transparent common electrode may be formed on the first substrate 112.

A printed circuit board (not shown) is connected to the liquid crystal panel 110 through a connection member (not shown) such as a flexible circuit board or a tape carrier package (TCP) along one edge of the liquid crystal panel 110. At this time, the printed circuit board (not shown) may be closely contacted with the backside of the cover bottom portion 150 in a modularized manner, although not shown in the drawing.

In the liquid crystal panel 110 having the above-described structure, when a selected thin film transistor is turned on for each gate line by an on or off signal of a gate driving circuit transmitted through a printed circuit board (not shown) The signal voltage is transmitted to the corresponding pixel electrode through the data line, and the alignment direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode.

Although not shown in the drawing, a sealing portion may be provided on a side surface of the other edge of the liquid crystal panel 110 except for one edge thereof, which has elasticity and absorbs external impact.

At this time, the sealing portion may be formed in a black-based dark color, so that light from the backlight unit 120 is absorbed in the sealing portion even if it is guided to the side of the first substrate 112 or the second substrate 114 The light leakage phenomenon that may occur through the side of the first substrate 112 or the second substrate 114 is prevented.

On the rear surface of the liquid crystal panel 110, a backlight unit 120 is provided to supply light so that the difference in transmittance can be displayed as an image.

The backlight unit 120 includes a light source arranged along one inner side surface 150a of the cover bottom portion 150, a reflective plate 125, a light guide plate 123 seated on the reflective plate 125, And a plurality of optical sheets 121,

For example, the LED 129a is used as a light source, and a plurality of LEDs 129a are spaced apart from each other at a predetermined interval and mounted on an LED printed circuit board (LED PCB 129b) ).

At this time, the LED printed circuit board 129b may correspond to a metal core printed circuit board (MCPCB) having a heat dissipating function for dissipating heat generated from the plurality of LEDs 129a.

The LED assembly 129 is mounted on the inner surface of the cover bottom portion 150a by an adhesive or the like so that light emitted from the plurality of LEDs 129a faces one side surface 123a corresponding to the light incoming surface of the light guide plate 123, And is fixed to the side surface.

The light emitted from the plurality of LEDs 129a of the LED assembly 129 is incident into the light guide plate 123 and is supplied to the liquid crystal panel 110 using refraction and reflection at the light guide plate 123. [

Although not shown in the drawing, an LED housing (not shown) may be provided on the back surface of the LED assembly 129 for more efficiently emitting heat generated from each of the plurality of LEDs 129a.

The reflection plate 125 reflects light passing through the back surface of the light guide plate 123 in a rectangular plate shape toward the liquid crystal panel 110, thereby improving the brightness of light.

The light guide plate 123 guides the light emitted from each of the plurality of LEDs 129a, thereby realizing a high-quality surface light source.

The light guide plate 123 has a rectangular plate shape and may include a pattern of a specific shape on the back surface to supply a uniform surface light source.

The pattern may be formed in various shapes such as an elliptical pattern, a polygonal pattern, a hologram pattern, and the like in order to guide light incident into the light guide plate 123, And may be formed on the lower surface of the light guide plate 123 by a printing method or an injection method.

Such a pattern may be formed with uniform spacing and size, but is not limited thereto. The spacing between patterns may be uniform as the distance from a plurality of LEDs 129a as a light source increases, but the pattern may be formed to have a larger size, The distance between the LEDs 129a may be smaller than the size of the LEDs 129a.

The light guide plate 123 for this purpose may be made of polymethyl methacrylate (PMMA) or polymethacrylic styrene (MS) resin in which polymethyl methacrylate (PMMA) and polystyrene (PS) are mixed. have.

The plurality of optical sheets 121 interposed on the light guide plate 123 diffuse or condense the light converted into the surface light source by the light guide plate 123 so that a more uniform surface light source is incident on the liquid crystal panel 110 .

The plurality of optical sheets 121 may include a diffusion sheet for diffusing light, at least one prism sheet for condensing light, and a protective sheet.

The liquid crystal panel 110 and the backlight unit 120 are modularized through the cover bottom part 150. At this time, the liquid crystal panel 110 is fixed to the cover back part 150 at the back edge of the liquid crystal panel 110 (Not shown) for bonding the liquid crystal panel 110 and the backlight unit 120 to each other.

Here, the cover bottom portion 150, which serves as a base of the entire structure, covers the back surface and the side surface of the backlight unit 120 and houses the backlight unit 120.

The cover portion 150 for this purpose includes a first cover bottom 152 having a rectangular plate shape, a horizontal portion 153 overlapping with and contacting the first cover bottom 152, And a second cover bottom 155 including a vertical portion 154.

The cover bottom portion 150 may have a silver color.

In this case, since the bottom side is thicker than the side face, the backlight unit 120 is stably housed. In addition, So that the panel 110 and the backlight unit 120 can be supported.

The cover portion 150 may be integrally formed.

The inner side surfaces 150a and 150b of the cover bottom portion 150 may be provided with the LED assembly 129 and the light leakage preventing means 160. The inner side surface 150a of the cover bottom portion 150 When the LED assembly 129 is provided, light leakage preventing means 160 is provided on at least the other inner side surface 150b except the inner side surface. The LED assembly 129 may be provided on each of the opposite inner side surfaces of the cover portion 150 and the light leakage preventing means 160 may be provided on each of the remaining inner side surfaces.

The light leakage prevention unit 160 prevents light leakage that may occur between the side surface of the backlight unit 120 and the inner surface of the cover bottom part 150 and includes a first portion 162 and a second portion 164 for absorbing most of the light.

The first portion 162 has a hue of white or gray and is formed at a height H1 corresponding to the thickness of the side surface of the light guide plate 123 and is emitted through the side surface of the light guide plate 123 Absorbs a part of light and reflects a part of the light so as not to lower the brightness of the liquid crystal display device and to increase the light efficiency.

The first portion 162 is characterized in that the reflectance is higher than the absorption ratio.

The first portion 162 may have a different color depending on the structure of the pattern included in the back surface of the light guide plate 123. The second portion of the light guide plate 123 may be formed by a pattern included in the back surface of the light guide plate 123 123b) is strong, it can be realized as a bright type of gray color so as to absorb a larger amount of light. When light intensity is weak, it can be absorbed into a white color Can be implemented. For example, as the distance from the plurality of LEDs 129a increases, the size of the pattern is uniform, but the spacing between the patterns becomes smaller, so that when the intensity of light is increased, the first portion 162 can be realized in a gray color. The first portion 162 is preferably a first portion 162 of the light leakage prevention means 160 formed on the inner side of the inner side of the cover bottom portion 150a where the LED assembly 129 is disposed Do.

The second portion 164 has a black color and is formed with a second height H2 so as to cover the entire inner surface of the vertical portion 154 of the second cover bottom 155 together with the first portion 162, The light emitted from the side surfaces of the plurality of optical sheets 121 and the plurality of optical sheets 121 is absorbed to thereby prevent the light leakage phenomenon.

The second portion 164 is characterized in that its absorption rate is higher than that of the reflectance.

On the other hand, the first part is not limited to the color of white or gray, and a color having a reflectance higher than that of the absorption may be applied. The second part is not limited to black, It can also be applied.

The light propagation path by the light leakage preventing means 160 will be described with reference to FIG.

3, the first light L11 emitted through the second side surface 123b of the light guide plate 123 and having the first brightness is transmitted by the first portion 162 of the light leakage preventing means 162 The first light L12 is absorbed and reflected to have a second luminance lower than the first luminance and reflected by the light guide plate 123 or the plurality of optical sheets 121 through the light guide plate 123 or the plurality of optical sheets 121, And the incident first light L13 is emitted through the display area DA of the liquid crystal panel 110. [

The second light L21 emitted through the second side surface 123b of the light guide plate 123 and having the first brightness is mostly absorbed in the second portion 164 of the light leakage preventing means 162. At this time, The reflected second light L22 is blocked by the non-display area NDA of the liquid crystal panel 110 and is not emitted to the outside when the light of the second light L22 is reflected with a third luminance lower than the first and second luminance do.

The first portion 162 of the light leakage prevention means 160 absorbs a part of the light emitted from the second side face 123b of the light guide plate 123 and reflects a part thereof, So that the light efficiency of the liquid crystal display device 100 is increased eventually. The second portion 164 of the light leakage prevention means 160 absorbs most of light emitted from the second side surface 123b of the light guide plate 123. [ At this time, even if a part of the light is reflected at the second portion 164, the light is blocked at the non-display area NDA of the liquid crystal panel 110 and is not emitted. Therefore, as shown in FIG. 4, The light leakage phenomenon that may occur between the inner surfaces of the cover portion 150 is prevented. The AC area in FIG. 4 corresponds to the AB area in FIG. 3, and the light leakage preventing unit 160 according to the present invention is applied to the display area DA between the display area DA and the non-display area NDA of the liquid crystal panel 110 It can be seen that the generated light leakage phenomenon is prevented.

In other words, if there is no light leakage preventing unit 160, light emitted through the side surface of the light guide plate is reflected on the inner surface of the cover bottom portion, and light leakage phenomenon occurs through the display region of the liquid crystal panel. Conventionally, a light leakage phenomenon, which may occur between the side surface of the backlight unit and the inner surface of the cover bottom, has been prevented through the support main body. However, in the present invention, the first part for weakly reflecting light and the second part The light leakage preventing means 160 is provided to prevent the light leakage phenomenon.

The light emitted from each of the plurality of LEDs 129a of the backlight unit 120 is incident on the light-incoming portion of the light guide plate 123 and then transmitted through the liquid crystal panel 110 and is further processed into a more uniform high-quality surface light source while passing through the plurality of optical sheets 121 together with the light reflected by the reflection plate 125, and is supplied to the liquid crystal panel 110.

As described above, the liquid crystal display 100 according to the embodiment of the present invention can prevent the light leakage phenomenon even though the components of the conventional top cover and the support main are omitted. In addition, by omitting the constituent elements, it is possible to realize a liquid crystal display device which is light in weight, thin in shape, and has a minimum bezel width, while reducing the cost of parts and further reducing the overall manufacturing cost.

Hereinafter, another example of light leakage preventing means according to the present invention will be described with reference to the drawings.

FIG. 5A is a front view showing another example of light leakage prevention means according to an embodiment of the present invention, and FIG. 5B is a sectional view showing another example of light leakage prevention means according to an embodiment of the present invention.

5A and 5B, the light leakage prevention unit 160 includes a first portion 162 having a white or gray-based color, and a second portion 162 formed on the first portion 162, And a second portion 164.

The light leakage prevention means 160 corresponds to a lightweight and thin cross-section adhesive tape and has a bar shape having a first length L and a first width W1.

The first portion 162 has a first width W1 and the second portion 164 extends from an edge of the first portion 162 to an upper portion of the first portion 162 to a second width W2 And overlaps and comes into contact with the first portion 162.

Accordingly, the light-shielding preventing means 160 has a double-layer structure, and the first portion 162 is partially covered by the second portion 164 to correspond to the first height H1 as shown in Fig. . At this time, the second portion 164 has a second width W2 corresponding to the second height H2.

Meanwhile, in the liquid crystal display device according to the present invention, when modulating the liquid crystal panel and the backlight unit, an adhesive means may be included for more rigid binding.

This will be described with reference to the drawings.

6 is a cross-sectional view showing another example of a liquid crystal display device according to an embodiment of the present invention. Here, the structure except for the bonding means is the same as that of FIG. 1, and the same reference numerals are assigned thereto, and a detailed description of the same constitution will be omitted.

6, the liquid crystal display 100 includes a liquid crystal panel 110, a backlight unit 120, a cover supporter 150 for modulating the liquid crystal panel 110 and the backlight unit 120, Adhesive means 180.

Here, the adhesive means 180 corresponds to a lightweight and thin adhesive tape and may have a black color. In this case, the light shielding process formed in the non-display area of the liquid crystal panel 110 may be omitted.

The adhesive means 180 is provided at the rear edge of the liquid crystal panel 110 to fix the liquid crystal panel 110 and to perform the light shielding function.

Particularly, since the bonding means 180 is provided at the rear edge of the liquid crystal panel 110 and is bent to adhere along the outer surface of the cover bottom portion 150, the bonding between the liquid crystal panel 110 and the backlight unit 120 It can be done firmly.

More specifically, the adhesive means 180 is partially provided between the back edge of the liquid crystal panel 110 and the upper surface of the vertical portion 154 of the cover bottom portion 150 corresponding to the back edge of the liquid crystal panel 110, 150 and is attached along the outer surface of the cover bottom portion 150. As shown in FIG.

The embodiments of the present invention as described above are merely illustrative, and those skilled in the art can make modifications without departing from the gist of the present invention. Accordingly, the protection scope of the present invention includes modifications of the present invention within the scope of the appended claims and equivalents thereof.

100: liquid crystal display device 110: liquid crystal panel
120: backlight unit 123: light guide plate
150: cover < RTI ID = 0.0 >
155: second cover valve 160: means for preventing light leakage
162: first part 164: second part
180: adhesive means

Claims (9)

A liquid crystal panel;
A backlight unit disposed on a rear surface of the liquid crystal panel, the backlight unit including a light source disposed on a side surface;
A cover bottom portion covering the back surface and the side surface of the backlight unit;
Light preventing means provided along at least one inner side surface of the cover bottom portion to prevent a light leakage phenomenon occurring between at least one inner side surface of the cover bottom portion and a side surface of the backlight unit;
And the liquid crystal display device.
The method according to claim 1,
Wherein the cover bottom portion includes a first cover bottom having a rectangular plate shape and a second cover bottom having a horizontal portion overlapping the first cover bottom and contacting the first cover bottom portion and a vertical portion perpendicular to the horizontal portion. .
The method according to claim 1,
Wherein the light leakage prevention means comprises a first portion having a reflectivity higher than that of the first portion and a second portion having a reflectance higher than the reflectivity.
The method of claim 3,
The first portion is a white or gray color,
And the second portion is black.
The method of claim 3,
Further comprising a light guide plate facing the light source,
The first portion has a first height corresponding to the thickness of the light guide plate,
The second portion has a second height and is positioned on top of the first portion
Wherein the light leakage preventing means is formed to cover at least one inner side surface of the cover bottom portion.
6. The method of claim 5,
Wherein the liquid crystal panel is divided into a display region for displaying an image and a non-display region for shielding the display region,
A part of the light reflected by the first part is incident on a side surface of the light guide plate and is emitted to the outside through a display area of the liquid crystal panel,
And a portion of the light reflected by the second portion is blocked by the non-display region.
The method according to claim 1,
Wherein the liquid crystal panel further comprises adhesive means for fixing the liquid crystal panel to the rear edge of the liquid crystal panel.
8. The method of claim 7,
The adhesive means
Wherein a part of the cover is attached between the back edge of the liquid crystal panel and the cover bottom part corresponding thereto and the remaining part of the cover is bent along the lateral direction of the cover bottom part and attached along the outer surface of the cover bottom part.
The method according to claim 6,
And the bonding means is black.

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