KR20150037299A - Liquid crystal display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device which has light weight and thin shape, while having high reliability of external impact resistance. The liquid crystal display device according to the present invention comprises a liquid crystal panel consisting of a laminated first and second substrate facing each other; a backlight unit arranged on the rear of the liquid crystal panel and providing light; and a support main including a first edge corresponding to one edge of the first substrate, and a second edge facing the first edge, wherein a first height of the first edge is higher than the second height of the second edge, and the first edge is characterized by protruding from the surface of the first substrate. Accordingly, the liquid crystal panel can be protected from external impact even some components are missed.

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device capable of protecting a liquid crystal panel from an external impact.

2. Description of the Related Art In recent years, the display field has rapidly developed in line with the information age. In response to this trend, a flat panel display device (FPD) having a thinness, light weight, A plasma display panel (PDP), an electroluminescence display device (ELD), a field emission display device (FED), and the like are introduced, and a conventional cathode ray tube : CRT).

In particular, the liquid crystal display device is advantageous for moving picture display and has a high contrast ratio and is actively used in notebooks, TVs, monitors, and the like. The liquid crystal display device (LCD) The principle of image realization by optical anisotropy and 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.

As a light source of the backlight unit, a fluorescent lamp such as a cold cathode fluorescent lamp (CCFL) or an external electrode fluorescent lamp (EEFL) has been widely used. Recently, however, Light-emitting diodes (LEDs), which have advantages in terms of power consumption, weight, and brightness, have been replacing fluorescent lamps with lightweight trends.

Direct type and edge type are classified according to the position of the light source. In the direct type backlight unit, the light emitted from the light source is directly supplied to the liquid crystal panel by arranging the light source under the liquid crystal panel. A side light type backlight unit is provided with a light guide plate on the lower side of the liquid crystal panel and a light source is disposed on at least one side of the light guide plate to refract and reflect light from the light guide plate to indirectly transmit light emitted from the light source to the liquid crystal panel It is a way to supply.

At this time, the side-type backlight unit is easier to manufacture than a direct-type backlight unit, and has a tendency to be used in many cases because it is thin, light in weight and low in power consumption.

The liquid crystal panel and the backlight unit described above are modularized and integrated by the support main body, the top cover and the cover bottom for modularization, and are ultimately constituted by the front cover and the cover glass, the system board and the back cover.

In particular, recently, liquid crystal display devices have been widely used in various fields such as desktop computers, wall-mounted televisions, and portable computers, thereby realizing a wide display area, and realizing a light-weight, thin and highly reliable liquid crystal display device However, there are a lot of components constituting the liquid crystal display device, and there is a limitation in realizing a light and thin type.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a lightweight and thin liquid crystal display device.

Another object of the present invention is to provide a liquid crystal display device which is lightweight, thin and highly resistant to external impacts.

According to an aspect of the present invention, there is provided a liquid crystal display comprising: a liquid crystal panel including first and second substrates which are bonded to each other; A backlight unit disposed on a rear surface of the liquid crystal panel to provide light; And a support main comprising a first side corresponding to one edge of the first substrate and a second side facing the first side, wherein the first height of the first side is greater than the second height of the second side And the first side is protruded from the surface of the first substrate.

The driving circuit board according to claim 1, further comprising: a driving printed circuit board connected along one edge of the first substrate, wherein the first side includes an upwardly projecting portion toward the liquid crystal panel, And a through-hole corresponding to the through-hole.

Wherein each of the first side and the second side includes a vertical part covering an edge of the liquid crystal panel and the backlight unit and a horizontal part protruding from the inside of the vertical part and supporting a part of the back surface of the liquid crystal panel, And is formed in the vertical portion of the first side.

The protrusion includes a first protrusion formed at the center of the vertical portion, and a second protrusion and a third protrusion formed on both sides of the first protrusion, respectively, and the through-hole corresponds to the first protrusion .

The liquid crystal panel and the backlight unit may further include adhesive means having a rectangular shape which is made of black with a double-sided adhesive tape and whose central portion is opened so as to cover the four sides of the front edge of the backlight unit, And are connected to each other.

The liquid crystal display device further includes a cover glass disposed on the front surface of the liquid crystal panel.

Here, an elastic member is provided between the first side and the cover glass to mitigate an impact.

According to the liquid crystal display device according to the present invention, the liquid crystal panel and the backlight unit are modularized using the double-sided adhesive means and the support main, so that a lightweight and thin liquid crystal display device can be realized.

In addition, a protrusion is formed at one edge of the support main body corresponding to the non-display region of the first substrate exposed through the second substrate to protect the first substrate from damage by damaging the first substrate, Can be prevented. Furthermore, a highly reliable liquid crystal display device which is resistant to an external impact can be realized.

Accordingly, it is possible to realize a liquid crystal display device which is lightweight, thin, and highly reliable.

1 is a cross-sectional view illustrating a liquid crystal display device according to a first embodiment of the present invention;
Fig. 2 is a view for explaining a case where an impact is applied to Fig. 1; Fig.
3 is a cross-sectional view showing a liquid crystal display device according to a second embodiment of the present invention.
Fig. 4 is a perspective view showing the support main of Fig. 3; Fig.
5 is a perspective view showing the drive printed circuit board of FIG. 3;
Fig. 6 is a perspective view showing the connection between the support main of Fig. 4 and the drive printed circuit board of Fig. 5;
7 is a view showing another example of a liquid crystal display device according to a second embodiment of the present invention.
FIG. 8 is a view showing another example of the support main shown in FIG. 4; FIG.

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

FIG. 1 is a cross-sectional view illustrating a liquid crystal display device according to a first embodiment of the present invention, and FIG. 2 is a view for explaining a case where an impact is applied to FIG.

The liquid crystal display 100 according to the first embodiment of the present invention includes a liquid crystal panel 110 and a backlight unit 120, a liquid crystal panel 110, and a backlight unit 120 for modulating the backlight unit 120 1 tape 160 and a support main body 130 and a cover glass 190 attached to the front surface of the liquid crystal panel 110 to protect the display area.

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.

Although not shown in the drawing, a plurality of gate lines and data lines cross each other on the inner surface of a first substrate 112, which is usually referred to as a lower substrate or an array substrate, on the premise of an active matrix system, pixels are defined, And a thin film transistor (TFT) is provided and connected in a one-to-one correspondence with the transparent pixel electrode formed in each pixel.

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) And a black matrix for covering non-display elements such as a gate line, a data line, and a thin film transistor. A transparent common electrode corresponding to the pixel electrode may be provided on the first substrate 112 or the second substrate 114.

Here, the first substrate 112 has a larger pad area than that of the second substrate 114, and the pad area includes a plurality of gate lines and a plurality of data lines A driving circuit 115 is formed.

The first and second polarizers 119a and 119b selectively transmit only specific light to the outer surfaces of the first and second substrates 112 and 114, respectively.

Also, a driving printed circuit board 117 is connected along at least one edge of the first substrate 112.

At this time, the driving printed circuit board 117 may be a flexible printed circuit board (FPCB) having flexible characteristics.

The driving printed circuit board 117 may be connected along one edge of the first substrate 112 via a connection member (not shown) such as a flexible circuit board or a tape carrier package (TCP) The support main body 130 can be properly brought into close contact with the side surface of the support main body 130 in the process of being assembled.

When the thin film transistor selected for each gate line is turned on by the on / off signal of the gate driving circuit transmitted through the driving printed circuit board 117, the liquid crystal panel 110 having the above- 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.

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 at least one edge of the support main body 130, a reflection plate 125, a light guide unit 123 mounted on the reflection plate 125, And optical sheets (121).

An LED 129a is used as a light source and a plurality of LEDs 129a are spaced apart from each other at regular intervals and mounted on an LED printed circuit board 129b to form an LED assembly 129 .

The LED assembly 129 is positioned such that the light is emitted from the plurality of LEDs 129a to face the light-incoming portion of the light-guiding portion 123 by adhesion or the like.

The light emitted from the plurality of LEDs 129a of the LED assembly 129 is incident into the light guiding portion 123 through the light incident portion and indirectly reflected by the light guiding portion 123, 110).

Here, a heat sink (not shown) may be provided on the rear surface of the LED assembly 129 to more efficiently discharge heat generated from each of the plurality of LEDs 129a. The heat sink (not shown) And may be a straight or bent shape that is vertically bent to surround one side of the LED printed circuit board 129b and the back side of the LED printed circuit board 129b and one side of the plurality of LEDs 129a.

The LED printed circuit board 129b may be a metal core printed circuit board having a heat dissipating function or a flexible printed circuit board (FPCB) having flexible characteristics.

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

At this time, the reflection plate 125 serves as a guide for modularizing the backlight unit 120 together with the support main body 130 while being attached to the back surface of the support main body 130 so as to cover a part of the back surface of the support main body 130 can do.

An adhesive material may be provided on the front surface of the reflection plate 125 so that the reflection plate 125 can be fixed to the back surface of the backlight unit 120 and the support main body 130.

Meanwhile, the reflection plate 125 may be formed to have a size enough to cover the entire back surface of the backlight unit 120 and the support main body 130.

The light guide plate 123 guides light emitted from each of the plurality of LEDs 129a to serve as 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 polygon pattern, a hologram pattern, and the like in order to guide light incident into the light guide plate 123, Is formed on the lower surface of the light guide plate 123 by a printing method or an injection method.

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.

Although not shown in the drawing, the light guide plate 123 may be a wedge-type light guide plate having a different thickness. In detail, the LED assembly includes a first region facing a plurality of LEDs of the LED assembly and including a slope having a first thickness reduced to a second thickness, a rectangular region connected to the first region, Shaped light guide plate including the second region of the shape. Or a wedge-shaped light guide plate including a first region having a first thickness, a second region having a second thickness smaller than the first thickness, and a third region connecting the first region and the second region.

The plurality of optical sheets 121 interposed in the upper portion of the light guide plate 123 are formed so as to 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. [ do.

The plurality of optical sheets 121 may include a diffusion sheet for diffusing light, a prism sheet for condensing light, and a protective sheet for protecting the prism sheet and serving as an auxiliary for diffusing light.

The liquid crystal panel 110 and the backlight unit 120 described above are modularized through the support main body 130 and the first adhesive means 160.

The support main body 130 includes a vertical part 132 surrounding the edges of the liquid crystal panel 110 and the backlight unit 120 and a vertical part 132 protruding from the inner surface of the vertical part 132 to cover the liquid crystal panel 110 and the backlight unit 120, which extend in the horizontal direction.

The first adhesive means 160 includes a light-shielding layer made of black ink for light shielding with a double-faced adhesive tape.

The first adhesive means 160 may have a rectangular frame shape that is opened at the center so as to cover the four sides of the front edge of the backlight unit 120.

The first adhesive means 160 is positioned between the liquid crystal panel 110 and the backlight unit 120 so that the liquid crystal panel 110 and the backlight unit 120 can be fixed to each other. One portion of the means 160 is attached from the edge of the uppermost sheet of the plurality of optical sheets 121 to cover the LED printed circuit board 129b and the other portion is attached to the uppermost sheet of the plurality of optical sheets 121 And is attached to cover the horizontal portion 134 of the support main body 130 from the edge.

As such, the first adhesive unit 160 binds the liquid crystal panel 110 and the backlight unit 120 and prevents light leakage.

Accordingly, the liquid crystal panel 110 and the backlight unit 120 are bound together through the first tape 160 having a double-sided state in a state where the liquid crystal panel 110 and the backlight unit 120 are surrounded by the support main body 130 having a rim- Module.

After the modulization, the cover glass 190 is attached to the front surface of the liquid crystal panel 110, more precisely to the upper portion of the second polarizing plate 119b through the second adhesive means 170. [

Although not shown in the drawings, the liquid crystal display module includes a front cover covering the front and side edges thereof, a system board disposed on the rear surface of the liquid crystal display module, a liquid crystal display module covering the system board at the rear side of the liquid crystal display module, And can be eventually equipped with a back cover for storing.

With this structure, the light emitted from each of the plurality of LEDs 129a of the backlight unit 120 is incident through the light-incident portion of the light guiding portion 123, and then refracted toward the liquid crystal panel 110 from the inside thereof And is then supplied to the liquid crystal panel 110 while being 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.

The liquid crystal display 100 according to the first embodiment of the present invention has the liquid crystal panel 110 and the backlight unit 120 bonded to each other through the first tape 160, And a cover bottom for housing the backlight unit are omitted. As a result, a lightweight and thin liquid crystal display device can be manufactured.

Meanwhile, the support main body 130 may be referred to as a guide panel, a main support, or a mold frame.

Meanwhile, the liquid crystal display device 100 according to the first embodiment of the present invention has a problem that it may be damaged by an external impact. To be more specific, the liquid crystal display device 100 is manufactured after a reliability test is performed after it is determined that it is a good product. In the reliability test, the liquid crystal display device 100 is detached at a predetermined height, Drop test.

2, an impact is applied to the first substrate 112 exposed at the edge of the second substrate 114 of the liquid crystal panel 110. When the first substrate 112 is exposed to the outside of the first substrate 112, Damaged or cracked cracks may occur. This is because the first edge of the first substrate 112 exposed through the second substrate 114 due to an external impact comes into contact with the cover glass 190.

Accordingly, a liquid crystal display according to a second embodiment of the present invention, which is lightweight, thin, and highly reliable, will be described below.

FIG. 3 is a sectional view showing a liquid crystal display device according to a second embodiment of the present invention, FIG. 4 is a perspective view showing the support main of FIG. 3, FIG. 5 is a perspective view showing the driving printed circuit board of FIG. 6 is a perspective view showing the coupling between the support main of Fig. 4 and the drive printed circuit board of Fig. 5; Here, since the structure except for the support main and the drive printed circuit board is the same as that of FIG. 1, detailed description of the same configuration will be omitted.

The liquid crystal display 200 according to the second embodiment of the present invention includes a liquid crystal panel 210, a backlight unit 220, and a backlight unit 220 for modularizing the liquid crystal panel 210 and the backlight unit 220. [ A first tape 260 and a support main 230.

Referring to FIG. 4, the support main 230 according to the second embodiment of the present invention has a rectangular frame shape comprising the first to fourth sides 230a, 230b, 230c, and 230d.

Each of the first to fourth sides 230a, 230b, 230c and 230d includes a vertical part 232 surrounding the edges of the liquid crystal panel 210 and the backlight unit 220, And a horizontal portion 234 for separating the backlight unit 220 from the backlight unit 220. [

The first side 230a corresponds to the LED assembly 229 and is selectively protruded from the inside of the horizontal portion 234 of the first side 230a so that the LED printed circuit board 229b is seated and a plurality of LEDs 229a And a plurality of LED trenches 235 to be disposed.

Accordingly, the LED printed circuit board of the LED assembly is seated on the front surface of the horizontal portion 234 of the first side 230a, and a plurality of LEDs 229a are disposed through the LED groove portion 235. [

A plurality of protrusions 233 protruding upward toward the liquid crystal panel 210 are partially formed on the vertical portion 232 of the first side 230a.

The first side 230a corresponds to one edge of the first substrate 212 exposed through the second substrate 214 and the protrusion 233 formed in the vertical part 232 of the first substrate 230 is subjected to an external impact The first substrate 212 is prevented from contacting one edge of the first substrate 212 with the cover glass 290, thereby protecting the first substrate 212 from an external impact.

The plurality of protrusions 233 of the first side 230a are in contact with the cover glass 290 so that the first substrate 212 exposed through the second substrate 214 is exposed, The edge of the cover glass 290 is prevented from being in contact with the edge of the cover glass 290.

The plurality of protrusions 233 includes a first protrusion 233a formed at the center of the vertical portion 232 of the first side 230a and a second protrusion 233b formed at both sides of the first protrusion 233a, And third projections 233b and 233c.

Each of the first to third projections 233a, 233b and 233c may have a different length, and each of the second and third projections 233b and 233c may have a first side 230a, And may be positioned at both ends of the vertical portion 232.

Each of the plurality of protrusions 233 may be formed to have the same width w1 as the vertical portion 232 of the first side 230a.

The first thickness h1 may be larger than the second thickness h2 of the first substrate 212 and may be greater than the second thickness h2 of the first substrate 212. In this case, the plurality of protrusions 233 may have a first thickness h1, 210 and the thickness of the first and second polarizing plates 219a, 219b and the second adhesive means 270 may be equal to or less than the third thickness H3.

Accordingly, the first side 230a has a height higher than the second side 230b facing the first side 230a.

At this time, the vertical part 232 of the first side 230a protrudes outside the surface of the first substrate 212, but not protruding outside the surface of the second substrate 214, so that the cover glass 290 is lifted The phenomenon can be prevented. More specifically, if the vertical portion 232 of the first side 230a is formed to abut the cover glass 290, the vertical portion 232 of the first side 230a, due to an external impact, A part of the cover glass 290 may be detached from the second polarizing plate 119b while transmitting an impact to the glass 290. [ In order to prevent this, a flow space may exist between the vertical portion 232 of the first side 230a and the cover glass 290. [

The support main body 230 having such a structure can be manufactured through injection molding.

A driving printed circuit board 217 is connected along one edge of the first substrate 212. The driving printed circuit board 217 has a first protrusion 233a at a position corresponding to the first protrusion 233a, And a through-hole 217a through which the through-hole 217a can pass.

6, the first protrusion 233a is exposed through the through-hole 217a of the drive printed circuit board 217. As shown in FIG.

The driving printed circuit board 217 connected to one edge of the first substrate 212 is exposed through the outer surface of the vertical portion 232 of the first side 230a. Accordingly, the drive printed circuit board 217 can be properly brought into close contact with the side of the support main body 230 in the process of assembling for release as a product.

7 is a view showing another example of the liquid crystal display device according to the second embodiment of the present invention.

As shown in FIG. 7, an elastic member 300 may be further provided between the plurality of protrusions 233 and the cover glass 290.

Here, the elastic member 300 may be formed of an elastic material to fill a space between the plurality of protrusions 233 and the cover glass 290, and to mitigate the impact.

The elastic member 300 absorbs impact transmitted from the vertical portion 232 of the first side 230a and prevents the lifting of the cover glass 290.

Fig. 8 is a view showing another example of the support main shown in Fig. 4. Fig.

As shown in FIG. 8, each of the plurality of protrusions 333a, 333b, and 333c may be formed to have a width w2 that is smaller than the vertical portion 232 of the first side 230a.

Or the first projection 333a may be formed to have a smaller width w2 than the vertical portion 232 of the first side 230a.

6, the size of the grooves 217a provided in the drive printed circuit board 217 (FIG. 6) is reduced, and the space for forming the wirings (not shown) formed on the drive printed circuit board 217 There is an advantage that it can be secured.

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.

110: liquid crystal panel 120: backlight unit
117, 217: drive printed circuit board 130, 230: support main
133, 233: protrusions 160, 260: first adhesive means

Claims (7)

A liquid crystal panel comprising first and second substrates which are bonded to each other;
A backlight unit disposed on a rear surface of the liquid crystal panel to provide light; And
And a support main comprising a first side corresponding to one edge of the first substrate and a second side facing the first side,
Wherein the first height of the first side is higher than the second height of the second side,
And the first side is protruded from the surface of the first substrate.
The method according to claim 1,
And a driving printed circuit board connected along one edge of the first substrate,
Wherein the first side includes an upward protruding portion toward the liquid crystal panel,
Wherein the drive printed circuit board has a through groove corresponding to the protruding portion.
3. The method of claim 2,
Each of the first and second sides
And a horizontal part protruding from the inside of the vertical part and supporting a part of the back surface of the liquid crystal panel,
And the protrusion is formed on a vertical portion of the first side.
3. The method of claim 2,
The protrusion
A first protrusion formed at a center of the vertical portion, and a second protrusion and a third protrusion formed respectively on both sides of the first protrusion,
And the through-hole is a groove corresponding to the first projection.
The method according to claim 1,
Further comprising bonding means having a rectangular frame shape made of black with a double-faced adhesive tape and opened at its center so as to cover the front edge of the backlight unit,
The liquid crystal panel and the backlight unit
And are bonded to each other through the bonding means.
The method according to claim 1,
And a cover glass disposed on a front surface of the liquid crystal panel.
The method according to claim 6,
Between the first side and the cover glass
And an elastic member for relieving an impact.

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