KR101395572B1 - Liquid crystal display device module - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device module, and more particularly, to a liquid crystal display device in which a light leakage phenomenon is improved in a side view type liquid crystal display device using a light emitting diode as a light source.

The present invention is characterized in that a light-shielding protrusion is formed at an end of a protrusion of a support main body, and the light guide plate and the LED assembly are displaced due to lifting of the light guide plate, The phenomenon can be prevented.

As a result, a liquid crystal display device having high brightness and high color uniformity can be provided.

Side view, LED, light guide plate, light leakage, liquid crystal display

Description

[0001] The present invention relates to a liquid crystal display device module,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device module, and more particularly to a side view type liquid crystal display device using a light emitting diode as a light source.

2. Description of the Related Art Recent developments in information technology and mobile communication technology have led to the development of display devices capable of visually displaying information. Such a display device is divided into a projection type and a direct-type type according to a driving type, and a direct-type type display is largely classified into a self-luminous type display and a non-luminous type display.

An example of a non-light emitting type display is an LCD (liquid crystal display).

The LCD requires a separate light source because it is an element that does not have its own light emitting element. Accordingly, a backlight unit having a fluorescent lamp on the back surface is provided, and a light is irradiated toward the front surface of the LCD, thereby realizing an image that can be recognized only through the backlight unit.

At this time, a general backlight is divided into a side type and a direct type according to the position of a light source emitting light. The metering type refracts the light of the light source emitted from one side of the rear side of the liquid crystal panel into a separate light guide plate to enter the liquid crystal panel, and direct light directs a plurality of light sources to the back of the liquid crystal panel.

As a light source of the backlight, a cold cathode fluorescent lamp, an external electrode fluorescent lamp, and a light emitting diode (LED) are used.

Among them, LEDs are widely used as a display light source, combining features of small size, low power consumption, and high reliability.

1 is a cross-sectional view of a typical liquid crystal display module using an LED as a light source.

As shown in the figure, a general liquid crystal display module includes a liquid crystal panel 10, a backlight unit 20, a support main body 30, a cover bottom 50, and a top cover 40.

The liquid crystal panel 10 is composed of a first substrate 13 and a second substrate 15 which are bonded to each other with a liquid crystal layer therebetween. A printed circuit board (not shown) is connected to each of the two adjacent edges of the liquid crystal panel 10 through a connection member (not shown).

Upper and lower polarizers 19a and 19b are attached to the upper and lower surfaces of the liquid crystal panel 10 and a backlight unit 20 is provided behind the liquid crystal panel 10 respectively.

At this time, the backlight unit 20 includes an LED assembly 29 arranged along the longitudinal direction of at least one side of the support main body 30, a white or silver reflective plate 25 seated on the cover bottom 50, A light guide plate 23 that is seated on the reflection plate 25, and a plurality of optical sheets 21 interposed therebetween.

And a curtain tape 60 disposed between the optical sheet 21 and the liquid crystal panel 10 and shielding the liquid crystal panel 10 from light leakage to a portion outside the screen display area.

The LED assembly 29 is formed on one side of the light guide plate 23 and includes a plurality of light emitting LEDs 29a and a flexible printed circuit board 29b on which the LEDs 29a are mounted.

The liquid crystal panel 10 and the backlight unit 20 are covered with a top cover 40 covering the upper edge of the liquid crystal panel 10 in a state where the edge is surrounded by the support main 30 having a rectangular frame shape, And the cover bottoms 50 are integrally joined to each other through the support main body 30.

As a part of such a liquid crystal display device module, the portion will be described in more detail with reference to FIG. 2, which is a cross-sectional view showing an enlarged view of region A in FIG.

As shown in the figure, an LED 29a is arranged along one side surface of a light guide plate 23 of a general liquid crystal display module, and the LED 29a is mounted on the FPCB 29b.

At this time, only one LED 29a is shown in the drawing, but a plurality of LEDs 29a are mounted on the FPCB 29b at a predetermined interval, and the LEDs 29a are turned on at once to realize white light.

The LED assembly 29 is fixed in position by adhesion or the like so that the light F emitted from the plurality of LEDs 29a faces the light incident portion of the light guide plate 23. For this purpose, A protrusion 31 of a certain shape is formed on the inner side surface of the edge so that the upper surface of the protrusion 31 supports the liquid crystal panel 10 and an LED assembly 29 is attached to the lower surface thereof with an adhesive material such as a double- Is attached and fixed.

The light F emitted from each of the LEDs 29a is incident on the light entrance portion of the light guide plate 23 and then refracted toward the liquid crystal panel 10 inside the light entrance portion of the light guide plate 23, While being passed through the optical sheet 21, is processed into a more uniform high-quality surface light source and supplied to the liquid crystal panel 10. [

On the other hand, the light guide plate 23 is attached to the support main body 30 using an adhesive material such as a double-sided tape 70, which causes the following problems.

That is, when the liquid crystal display module as described above is used in a high-temperature and high-humidity reliability test or similar high-temperature and high-humidity environment, adhesion and adhesion of the light guide plate 23 to the support main body 30 by heat and humidity Sometimes the sex material is excited.

When the adhesive material is lifted up, the light guide plate 23 is also lifted and the positions of the light guide plate 23 and the LED assembly 29 are changed.

Light from the light source is directly incident on the plurality of optical sheets 21 and is directly output to the outside of the liquid crystal panel 10 by the optical sheet 21, As shown in FIG.

As a result, the quality of the liquid crystal display device such as lowering of luminance and color uniformity is deteriorated.

SUMMARY OF THE INVENTION It is a first object of the present invention to provide a liquid crystal display device module that is not limited by the position of a light guide plate.

It is a second object of the present invention to improve the brightness and color uniformity of the liquid crystal display device.

In order to achieve the above-mentioned object, A reflector resting on the cover bottom; A light guide plate mounted on the reflection plate; An LED assembly positioned on the same plane as the light guide plate; A support main body having a rectangular shape in which the LED assembly is arranged along one side edge, the support main body including a light leakage prevention protrusion inside the rectangular frame; A plurality of optical sheets seated on the light guide plate; A liquid crystal panel seated on top of the plurality of optical sheets; And a top cover covering an upper edge of the liquid crystal panel and coupled to the support main and cover bottoms, wherein the light leakage preventing jaw is configured such that light emitted from the LED assembly is directly incident on the liquid crystal panel through the optical sheet And a liquid crystal display device module.

The support main may include a first jaw on one side of the LED assembly, wherein the light leakage preventing jaw is formed such that the top surface of the first jaw is coplanar with the top of the first jaw .

In this case, the thickness of the light leakage preventing jaw may be twice the thickness of the first jaw, and the liquid crystal panel may be supported by the upper surface of the first jaw, And the LED assembly is attached.

The support main may include a first jaw on one side of the LED assembly and a second jaw extending from the first jaw. The light leakage preventing jaw may have an upper surface at an end of the second jaw, And extending in the same plane.

Wherein the thickness of the light leakage preventing jaw is twice the thickness of the second jaw. The liquid crystal panel is supported by the upper surface of the first jaw, a curtain tape is attached to the lower surface of the first and second jaws, and an LED assembly is attached to the lower surface of the first and second jaws. The LED assembly includes red, green, And a flexible printed circuit board (FPCB) in which the LEDs are spaced apart from each other by a predetermined distance.

As described above, according to the present invention, the light leakage preventing phenomenon generated in the extraneous light guiding portion due to the misalignment of the light guide plate and the LED assembly can be prevented.

Thereby, it is possible to provide a liquid crystal display device excellent in quality with high luminance and uniform color reproducibility.

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

The present invention can be applied to a small liquid crystal display module mounted on a mobile phone, a digital multimedia broadcasting (DMB) terminal, a personal digital assistant (PDA) and a digital camera, and a large liquid crystal display module used in a TV or a computer monitor Hereinafter, a small liquid crystal display module manufactured to be 5 inches or less will be described as an example.

4 is an exploded perspective view of a liquid crystal display module according to an embodiment of the present invention.

As shown in the figure, the liquid crystal display module includes a liquid crystal panel 110, a backlight unit 120, a support main body 130, a cover bottom 150, and a top cover 140.

First, the liquid crystal panel 110 plays a key role in image display. The liquid crystal panel 110 includes a first substrate 113 and a second substrate 115 which are bonded to each other with a liquid crystal layer interposed therebetween.

At this time, although not shown in the drawings, a plurality of gate lines and data lines cross each other on the inner surface of the first substrate 113, which is usually referred to as a lower substrate or an array substrate, to define pixels, A thin film transistor (TFT) is provided at each of the intersections of the pixels and is connected in a one-to-one correspondence with the transparent pixel electrodes formed in the pixels.

On the inner surface of the second substrate 115 called an upper substrate or a color filter 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. In addition, a transparent common electrode covering these elements is provided.

A printed circuit board 117 is connected to at least one edge of the liquid crystal panel 110 via a flexible circuit board or a connection member (not shown) such as a tape carrier package (TCP) The support main body 130 or the cover bottom 150 is properly bent.

At this time, the printed circuit board 117 is divided into a gate driving circuit for transferring on / off signals of the thin film transistors to gate lines, and a data driving circuit for transferring image signals for each frame to the data lines, Can be located at two adjacent edges.

When the selected thin film transistor is turned on for each gate line by the on / off signal of the gate driving circuit to be scanned, the liquid crystal panel 110 having the structure described above turns on the signal voltage of the data driving circuit 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.

In addition, the liquid crystal display module according to the present invention is provided with a backlight unit 120 for supplying light from the rear surface of the liquid crystal display device module so that a difference in transmittance represented by the liquid crystal panel 110 is externally expressed.

The backlight unit 120 includes an LED assembly 129, a white or silver reflective plate 125, a light guide plate 123 seated on the reflective plate 125, and a plurality of optical sheets 121 interposed therebetween .

The LED assembly 129 is disposed on one side of the light guide plate 123. The LED assembly 129 includes a plurality of LEDs 129a and an FPCB 129b on which the LED 129a is mounted, .

The light guiding plate 123 uniformly spreads to the wide area of the light guide plate 123 while the light incident from the LED 129a travels through the light guide plate 123 by total reflection several times to provide a primary surface light source to the liquid crystal panel 110 . The light guide plate 123 may include a pattern of a specific pattern on the back surface to supply a uniform surface light source.

The reflection plate 125 is disposed on the back surface of the light guide plate 123 and reflects light passing through the back surface of the light guide plate 123 toward the liquid crystal panel 110 to improve the brightness of light. The optical sheet 121 on the light guide plate 123 includes a diffusion sheet and at least one light condensing sheet so as to diffuse or condense light passing through the light guide plate 123 to provide a more uniform surface light source to the liquid crystal panel 110 .

The liquid crystal panel 110 and the backlight unit 120 are modularized through a top cover 140, a support main body 130 and a cover bottom 150. The top cover 140 is disposed on the upper surface of the liquid crystal panel 110, And the front cover 140 is opened to display an image to be displayed on the liquid crystal panel 110. The liquid crystal panel 110 may be a liquid crystal display.

In addition, the cover bottom 150, on which the liquid crystal panel 110 and the backlight unit 120 are mounted, is a base for assembling the entire structure of the liquid crystal display device module, is formed into a rectangular plate shape and its four sides are vertically bent .

A support main body 130 mounted on the cover bottom 150 and covering the edges of the liquid crystal panel 110 and the backlight unit 120 is coupled with the top cover 140 and the cover bottom 150.

At this time, the support main body 130 is formed of a mold of synthetic resin and has a substantially rectangular shape. The support main body 130 has a protruding portion (not shown) in a certain shape on the inner side surface of one side edge, (135) are further constituted.

The structure of the support main body 130 according to the embodiment of the present invention will be described in detail with reference to FIGS. 5 and 6. FIG.

FIG. 5 is a cross-sectional view of a liquid crystal display module according to an embodiment of the present invention, and FIG. 6 is an enlarged view of a region B in FIG.

As shown in FIG. 5, the liquid crystal panel 110 and the backlight unit 120 are integrally modularized to protect from impact and minimize light loss.

The liquid crystal display module includes a liquid crystal panel 110 composed of first and second substrates 113 and 115 bonded to each other with a liquid crystal layer interposed therebetween and a backlight unit A top cover 140 covering the top edge of the liquid crystal panel 110 with the edge of the support main 130 in a rectangular shape and a cover bottom 150 covering the back side of the backlight unit 120, Are coupled to each other at the front and rear sides, and are integrated through the support main body 130.

The backlight unit 120 includes an LED assembly 129 arranged along the longitudinal direction of at least one edge of the support main body 130, a reflection plate 125 mounted on the cover bottom 150, ) And a plurality of optical sheets 121 interposed therebetween.

A curtain tape 160, which is disposed between the optical sheet 121 and the liquid crystal panel 110 and shields light from the LED 129a from leaking to a portion outside the screen display area of the liquid crystal panel 110, .

The LED assembly 129 includes a plurality of LEDs 129a each emitting red (R), green (G) and blue (B) color lights, and a plurality of LEDs 129a spaced apart from each other by a surface mount technology and a FPCB 129b mounted by a technology: SMT.

At this time, the plurality of LEDs 129a mounted on the FPCB 129b are turned on at once to realize white light by RGB color mixing.

Therefore, the light emitted from each of the LEDs 129a is incident on the light entering portion of the light guide plate 123 and then refracted toward the liquid crystal panel 110 in the inside thereof, and the light reflected by the reflection sheet 125, And is supplied to the liquid crystal panel 110 while being processed into a more uniform and high-quality surface light source while passing through the liquid crystal panel 121.

The LED assembly 129a is fixed in position by adhesion or the like so that the light emitted from the plurality of LEDs 129a faces the light-incoming portion of the light guide plate 123. For this purpose, And a protrusion 131 of a certain shape is formed on the inner side of the LED panel. The upper surface of the protrusion 131 supports the liquid crystal panel 110 and the LED assembly 129 is attached and fixed to the lower surface of the protrusion 131.

The protruding portion 131 includes a first protrusion 131a for supporting the liquid crystal panel 110 and a second protrusion 131b extending further from the first protrusion 131a so as to cover the protrusion 131, And a light-guiding protrusion 135 is formed at an end of the second protrusion 131b.

That is, the edge of the liquid crystal panel 110 is supported on the upper surface of the first step 131a, the light shielding tape 160 is attached to the upper surface of the second step 131b, The FPCB 129b of the LED assembly 129 is attached to the flat lower surface of the jaws 131a and 131b through an adhesive material such as a double-sided tape to form an LED 129a mounted on the FPCB 129b. To the reflection plate 125.

At this time, the LED 129a emits light in a direction parallel to the FPCB 129b so as to face the light incident portion of the light guide plate 123.

Here, the light-guiding protuberance 135 may be configured to prevent light leakage generated at the lifting portion of the light-guiding plate 123 by turning the light guide plate 123 and the LED assembly 129 in position by lifting the light- will be.

This will be described in more detail with reference to FIG. 6, which is an enlarged view of a region B in FIG.

6 is a view schematically showing a state in which the light F emitted from the LED assembly 129 is incident into the light guide plate 123. In the LED 129a facing the light entrance portion of the light guide plate 123, When the light F is diverted, the divergent light F is incident into the light guide plate 123 through the light-incident portion of the light guide plate 123.

The light F incident on the light guide plate 123 spreads evenly over a wide area of the light guide plate 123 and travels through the light guide plate 123 by total reflection several times to provide a primary surface light source to the liquid crystal panel 110 .

When the position of the light guide plate 123 is changed from the position of the LED assembly 129 because the LED 129a has an emission angle of at least 120 to 180 degrees, the light F emitted from the LED 129a is reflected by the light guide plate 123. [ The light is not entirely incident into the LED 123 and the light is dispersed upward and downward with respect to the LED 129a.

At this time, it is possible to prevent a part of the light F dispersed on the upper side of the LED 129a from being directly incident on the optical sheet 121 by the light-

A part of the light F emitted from the LED 129a and dispersed downward may be concentrated inside the light guide plate 123 by the reflective sheet 125 placed on the cover bottom 150. [

The light leakage preventing protrusion 135 is formed to be flush with the upper surface of the second jaw 131b of the support main protrusion 131. However, the light leakage preventing jaw 135 may have a thickness at least twice as large as the thickness of the second jaw 131b desirable.

More preferably, the thickness of the light-shielding protrusion 135 is a sum of the thickness of the second tuck 131b and the thickness of the FPCB 129b of the LED assembly attached to the lower surface of the second tuck 131b. In order to utilize the space in which the plurality of optical sheets 121 disposed on the light guide plate 123 are formed, the overall thickness of the LCD module is not affected.

Further, the light-shielding protrusion 135 is made of the same material as the support main body 130, so that a separate material cost is not required.

As described above, since the light guide plate 135 is formed on the protrusion 131 of the support main body 130, the light guide plate 123 and the LED assembly 129 are shifted from each other, Light leakage phenomenon can be prevented.

The present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

1 is a cross-sectional view of a typical liquid crystal display module using an LED as a light source.

2 is an enlarged cross-sectional view of a region A in Fig.

3 is a photograph showing a conventional light leakage phenomenon.

4 is an exploded perspective view of a liquid crystal display module according to an embodiment of the present invention.

5 is a sectional view of a liquid crystal display module according to an embodiment of the present invention.

6 is an enlarged view of a region B in Fig. 5; Fig.

Claims (10)

Cover cover and; A reflector resting on the cover bottom; A light guide plate mounted on the reflection plate; An LED assembly positioned on the same plane as the light guide plate; A support main body having a rectangular shape in which the LED assembly is arranged along one side edge, the support main body including a light leakage prevention protrusion inside the rectangular frame; A plurality of optical sheets seated on the light guide plate; A liquid crystal panel seated on top of the plurality of optical sheets; A top cover which is placed on the top edge of the liquid crystal panel and is coupled to the support main and cover bottoms, Wherein the light leakage preventing jaw prevents light emitted from the LED assembly from being directly incident on the liquid crystal panel through the optical sheet, wherein a curtain tape is attached to an upper surface of the light leakage preventing jaw And the height from the cover bottom to the top surface is higher than the height from the cover bottom to the top surface of the plurality of optical sheets. The method according to claim 1, Wherein the support main includes a first step at one side edge of the LED assembly. 3. The method of claim 2, And the upper surface of the first jaw is flush with the upper surface of the light leakage preventing jaw. The method of claim 3, Wherein the thickness of the light leakage preventing jaw is twice the thickness of the first jaw. 3. The method of claim 2, Wherein the liquid crystal panel is supported by the upper surface of the first jaw, and an LED assembly is attached to the lower surface of the first jaw. The method according to claim 1, Wherein the support main comprises a first jaw at one side edge of the LED assembly and a second jaw extending from the first jaw. The method according to claim 6, And the upper surface of the second jaw is flush with the upper surface of the light leakage preventing jaw. 8. The method of claim 7, And the thickness of the light leakage preventing jaw is twice the thickness of the second jaw. The method according to claim 6, Wherein the liquid crystal panel is supported by an upper surface of the first jaw, and an LED assembly is attached to a lower surface of the first and second jaws. Claim 10 has been abandoned due to the setting registration fee. The method according to claim 1, The LED assembly may include a plurality of LEDs emitting red (R), green (G), and blue (B) color lights, and a flexible printed circuit board (FPCB) LCD module.

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