KR20090043799A - 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 module, and more particularly, to a liquid crystal display device having a side view type liquid crystal display device using a light emitting diode as a light source.

A characteristic of the present invention is that the light leakage preventing jaw is formed at the end of the protrusion of the support main, and the light guide plate and the LED assembly are displaced due to the lifting of the light guide plate, so that the light emitted from the lifting part of the light guide plate is directly incident on the optical sheet. The phenomenon can be prevented.

For this reason, it is possible to provide a liquid crystal display device having high brightness and high color uniformity.

Side view, LED, LGP, light leakage, LCD

Description

Liquid crystal display device module

The present invention relates to a liquid crystal display module, and more particularly, to a side view liquid crystal display device using a light emitting diode as a light source.

Recently, with the development of information technology and mobile communication technology, the development of a display device capable of visually displaying information has been made. Such display apparatuses are classified into a projection type and a direct type according to a driving type, and the direct type display is classified into a self-luminous display and a non-luminous display having large light emission characteristics.

A non-light emitting display may be a liquid crystal display (LCD).

Since the LCD does not have a light emitting element, it requires a separate light source. As a result, a backlight unit having a fluorescent lamp is provided on a rear surface thereof to irradiate light toward the front of the LCD, thereby realizing an identifiable image.

In this case, the general backlight is classified into a side type and a direct type according to the position of a light source emitting light. The photometric type refracts the light of the light source emitted from one side of the rear side with respect to the liquid crystal panel by a separate light guide plate to enter the liquid crystal panel, and the direct type directs light by placing a plurality of light sources directly on the back of the liquid crystal panel.

On the other hand, as a light source of the backlight, a cold cathode fluorescent lamp (Cold Cathode Fluoresent Lamp), an external electrode fluorescent lamp (External Electrode Fluoresent Lamp), and a light emitting diode (Light Emitting Diode (LED)) is used.

Among them, LEDs are particularly widely used as display light sources having features such as small size, low power consumption, and high reliability.

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

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

The liquid crystal panel 10 is a part that plays a key role in image expression and is composed of first and second substrates 13 and 15 bonded to each other with a liquid crystal layer interposed therebetween. A printed circuit board (not shown) is connected to each other along two adjacent edges of the liquid crystal panel 10 through a connecting member (not shown).

In addition, upper and lower polarizing plates 19a and 19b are attached to upper and lower surfaces of the liquid crystal panel 10, and a backlight unit 20 is provided behind the liquid crystal panel 10.

In this case, the backlight unit 20 includes an LED assembly 29 arranged along at least one edge length direction of the support main 30, a white or silver reflecting plate 25 seated on the cover bottom 50, The light guide plate 23 mounted on the reflective plate 25 and a plurality of optical sheets 21 interposed thereon are included.

In addition, a light blocking tape 60 disposed between the optical sheet 21 and the liquid crystal panel 10 and shielding light from being leaked to a portion outside the screen display area of the liquid crystal panel 10 is included.

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

The liquid crystal panel 10 and the backlight unit 20 have a top cover 40 surrounding the top edge of the liquid crystal panel 10 and a back surface of the backlight unit 20 in a state where the edges are surrounded by the support main 30 having a rectangular frame shape. Cover cover 50 to cover each is coupled in front and rear are integrated through the support main 30 as a medium.

As a part of the liquid crystal display module, the corresponding portion will be described in more detail with reference to FIG. 2, which is an enlarged cross-sectional view of region A of FIG. 1.

As shown, the LED 29a is arranged along one side of the light guide plate 23 of the 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 regular intervals, thereby lighting white light at a time.

The LED assembly 29 is fixed by a method such as adhesive so that the light (F) emitted from the plurality of LEDs (29a) to face the light guide plate 23, the light incident plate 23, for this purpose, the support main 30 is one side A protruding portion 31 having a predetermined shape is formed on the inner surface of the edge, and the upper surface thereof supports the liquid crystal panel 10, and the lower surface thereof has an LED assembly 29 through an adhesive material such as a double-sided tape (not shown). Is attached and fixed.

Therefore, the light F emitted from each of the LEDs 29a is incident on the light incident portion of the light guide plate 23 and then refracted toward the liquid crystal panel 10 therein, and the light reflected by the reflective sheet 25 Together with the optical sheet 21 is processed into a more uniform surface light source of high quality is supplied to the liquid crystal panel 10.

On the other hand, the light guide plate 23 is attached to the support main 30 by using an adhesive material such as 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, the light guide plate 23 is attached and fixed to the support main 30 by heat and humidity. Sexual substances are lifted up.

When the adhesive material is lifted in this way, the light guide plate 23 is also lifted together, and the positions of the light guide plate 23 and the LED assembly 29 are distorted.

Therefore, light leakage occurs at a portion thereof, and light caused by the light leakage is directly incident on the plurality of optical sheets 21, and is directly emitted to the outside of the liquid crystal panel 10 by the optical sheets 21, and is illustrated in FIG. 3. As can be seen visually.

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

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a first object of the present invention is to provide a liquid crystal display module which is not restricted by the light guide plate position.

Accordingly, the second object of the present invention is to prevent light leakage and to improve luminance and color uniformity of the liquid crystal display.

In order to achieve the object as described above, cover cover; A reflection plate seated on the cover top; 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 having a rectangular frame shape in which the LED assembly is arranged along one side edge, and including a light leakage preventing jaw inside the rectangular frame; A plurality of optical sheets seated on the light guide plate; A liquid crystal panel seated on the plurality of optical sheets; A top cover that covers the top edge of the liquid crystal panel and is coupled to the support main and the cover bottom, and the light leakage preventing jaw is configured to directly inject light emitted from the LED assembly into the liquid crystal panel through an optical sheet. It provides a liquid crystal display module, characterized in that to prevent.

The support main is characterized in that it comprises a first jaw on one side edge of the LED assembly is arranged, the light leakage prevention jaw is characterized in that the upper surface is formed in the same plane extending to the end of the first jaw .

At this time, the thickness of the light leakage prevention jaw is characterized in that twice the thickness of the first jaw, the liquid crystal panel is characterized in that supported by the upper surface of the first jaw, the lower surface of the first jaw It is characterized in that the LED assembly is attached.

The support main may include a first jaw and a second jaw extending from the first jaw at one edge of the LED assembly, and the light leakage preventing jaw may have an upper surface at the end of the second jaw. It is characterized by being configured to extend to form the same plane.

The thickness of the light leakage preventing jaw is characterized in that twice the thickness of the second jaw, the liquid crystal panel is characterized in that supported by the upper surface of the first jaw, the upper surface of the second jaw, shading tape (curtain tape) is attached, and the LED assembly is attached to the lower surface of the first and second jaws, the LED assembly is red (R), green (G), blue (B) color light Each of the emitting LED and the LED is characterized in that it is composed of a flexible printed circuit board (FPCB) mounted at a predetermined interval apart.

As described above, by configuring the light leakage prevention jaw in the support main in accordance with the present invention, there is an effect that can prevent the light leakage phenomenon generated in the light guide plate lifting portion as the position of the light guide plate and the LED assembly is changed.

As a result, there is an effect of providing a liquid crystal display device having excellent quality with high brightness 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 mobile phone, a digital multimedia broadcasting (DMB) terminal, a small liquid crystal display module mounted on 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 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 exemplary embodiment of the present invention.

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

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

At this time, under the premise of an active matrix method, a plurality of gate lines and data lines intersect each other, and pixels are defined on an inner surface of the first substrate 113, which is generally referred to as a lower substrate or an array substrate. Thin film transistors (TFTs) are provided at the intersections of the transistors and are in one-to-one correspondence with transparent pixel electrodes formed in each pixel.

In addition, the inner surface of the second substrate 115 called the upper substrate or the color filter substrate may correspond to each pixel, for example, a color filter of red (R), green (G), and blue (B) color A black matrix covering the non-display elements such as gate lines, data lines, and thin film transistors is provided. In addition, a transparent common electrode covering them is provided.

In addition, the printed circuit board 117 is connected through at least one edge of the liquid crystal panel 110 through a connecting member (not shown) such as a flexible circuit board or a tape carrier package (TCP). The side surface of the support main 130 or the cover bottom 150 is properly folded to be in close contact.

In this case, the printed circuit board 117 is divided into a gate driver circuit that scans and transmits the on / off signal of the thin film transistor to the gate line and a data driver circuit that transmits image signals for each frame to the data line. It can be located with two edges adjacent to each other.

Accordingly, in the liquid crystal panel 110 having the above-described structure, when the thin film transistor selected for each gate line is turned on by the on / off signal of the gate driver circuit which is scanned and transmitted, the signal voltage of the data driver circuit is applied to the corresponding pixel through the data line. The liquid crystal molecules are arrayed by the electric field between the pixel electrode and the common electrode, thereby indicating a transmittance difference.

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 panel 110 so that the difference in transmittance is expressed to the outside.

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

The above-described LED assembly 129 is located on one side of the light guide plate 123, the LED assembly 129 is a plurality of LEDs 129a, and the FPCB 129b in which the LEDs (129a) thereof are mounted at regular intervals. It includes.

The light guide plate 123 evenly spreads the light incident from the LED 129a to a wide area of the light guide plate 123 while propagating through the light guide plate 123 by a plurality of total reflections 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 shape on the rear surface to supply a uniform surface light source.

The reflective plate 125 is positioned on the rear surface of the light guide plate 123, and reflects light passing through the rear surface of the light guide plate 123 toward the liquid crystal panel 110 to improve the brightness of the light. The optical sheet 121 on the light guide plate 123 includes a diffusion sheet and at least one light collecting sheet, and diffuses or collects light passing through the light guide plate 123 to provide a more uniform surface light source to the liquid crystal panel 110. Let it enter.

The liquid crystal panel 110 and the backlight unit 120 are modularized through the top cover 140, the support main 130, and the cover bottom 150. The top cover 140 is formed on the upper surface of the liquid crystal panel 110 and A rectangular frame having a cross section bent in a shape of “a” so as to cover the side edge, and opens the front surface of the top cover 140 to display an image implemented in the liquid crystal panel 110.

In addition, the cover bottom 150 on which the liquid crystal panel 110 and the backlight unit 120 are seated, and which is the basis for assembling the entire structure of the liquid crystal display device module, has a rectangular plate shape and vertically bends its four edges to a predetermined height. Configure.

In addition, the support main 130 mounted on the cover bottom 150 and covering the edges of the liquid crystal panel 110 and the backlight unit 120 is combined with the top cover 140 and the cover bottom 150.

At this time, the support main 130 is made of a synthetic resin molded in a substantially rectangular frame shape, one side of the inner edge of the support main 130 is formed of a protrusion (not shown) of a predetermined shape, the light leakage prevention jaw at the end of the protrusion Characterized in that 135 is further configured.

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

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

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

Hereinafter, 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 for supplying light from the liquid crystal panel 110 underneath. The cover 120 includes a top cover 140 covering the top edge of the liquid crystal panel 110 and a back cover unit 150 covering the bottom surface of the liquid crystal panel 110 in a state where the edges of the support main 130 are surrounded by the edges. ) Are respectively combined in front and rear and are integrated through the support main 130.

The backlight unit 120 includes an LED assembly 129 arranged along at least one edge length direction of the support main 130, a reflector 125 mounted on the cover bottom 150, and the reflector 125. ) Includes a light guide plate 123 seated on the upper surface and a plurality of optical sheets 121 interposed thereon.

In addition, a light blocking tape 160 disposed between the optical sheet 121 and the liquid crystal panel 110 and shielding light from the LED 129a from leaking to a portion outside the screen display area of the liquid crystal panel 110 may be formed. Include.

The LED assembly 129 includes a plurality of LEDs 129a emitting red (R), green (G), and blue (B) colored lights, and a plurality of LEDs (129a) spaced apart at regular intervals to provide a surface mount technology. technology: FPCB 129b mounted by SMT).

At this time, by illuminating a plurality of LEDs (129a) mounted on the FPCB (129b) at once, white light is realized by color mixing of RGB.

Accordingly, the light emitted from each of the LEDs 129a is refracted toward the liquid crystal panel 110 after being incident on the light incident portion of the light guide plate 123, and the optical sheet together with the light reflected by the reflective sheet 125. While passing through 121, the light is processed into a more uniform surface light source of high quality and supplied to the liquid crystal panel 110.

On the other hand, the LED assembly 129a is fixed in position by the adhesive method such that the light emitted from the plurality of LEDs (129a) to face the light guide plate 123, the light receiving part, for this purpose, the support main 130 is one edge A protruding portion 131 having a predetermined shape is formed on the inner side thereof, and the LED assembly 129 is attached and fixed to the lower side thereof while supporting the liquid crystal panel 110.

In detail, the protrusion 131 may further include a protrusion 131 extending from the first jaw 131a and the first jaw 131a to support the liquid crystal panel 110. The second jaw 131b is attached, and the light leakage preventing jaw 135 is formed at the end of the second jaw 131b.

That is, the edge of the liquid crystal panel 110 is supported by the upper surface of the first jaw 131a, and the light blocking tape 160 is attached to the upper surface of the second jaw 131b, and the first and second edges of the first jaw 131a are supported. On the flat lower surfaces of the jaws 131a and 131b, the FPCB 129b of the LED assembly 129 is attached through an adhesive material (not shown) such as a double-sided tape, and the LED 129a mounted on the FPCB 129b. To face the reflector plate 125.

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

Here, the light leakage preventing jaw 135 is the position of the light guide plate 123 and the LED assembly 129 is changed by the lifting of the light guide plate 123, to block the light leakage generated by the lifting portion of the light guide plate 123 above. will be.

This will be described in more detail with reference to FIG. 6, which shows an enlarged view of region B of FIG. 5.

FIG. 6 is a view schematically illustrating a state in which light F emitted from the LED assembly 129 is incident into the light guide plate 123. In the LED 129a provided to face the light incident part of the light guide plate 123, FIG. When the light F is emitted, the emitted light F is incident into the light guide plate 123 through the light incident part of the light guide plate 123.

The light F incident on the light guide plate 123 is uniformly spread to a wide area of the light guide plate 123 while propagating through the light guide plate 123 by a plurality of total reflections to provide a primary surface light source to the liquid crystal panel 110. .

Since the LED 129a has an emission angle of light of at least 120 to 180 °, when the position of the light guide plate 123 is displaced from the LED assembly 129, the light F emitted from the LED 129a is light guide plate. 123 is not fully incident to the inside, the light is dispersed to the upper side and the lower side based on the LED (129a).

In this case, a part of the light F scattered to the upper side of the LED 129a by the light leakage preventing member 135 may be prevented from directly entering the optical sheet 121.

In addition, a portion of the light F emitted from the LED 129a and scattered downward may be concentrated into the light guide plate 123 by the reflective sheet 125 mounted on the cover bottom 150.

The light leakage preventing jaw 135 is configured to form the same plane as the upper surface of the second jaw 131b of the support main protrusion 131, but at least twice as thick as the thickness of the second jaw 131b. desirable.

Particularly, the thickness of the light leakage preventing jaw 135 may be equal to the thickness of the thickness of the second jaw 131b and the thickness of the FPCB 129b of the LED assembly attached to the bottom surface of the second jaw 131b. This is to use a space in which the plurality of optical sheets 121 interposed on the light guide plate 123 is used, thereby not affecting the overall thickness of the liquid crystal display module.

In addition, the light leakage preventing jaw 135 is composed of the same material as the support main 130 and does not require a separate material cost.

As described above, the light leakage preventing member 135 is formed in the protrusion 131 of the support main 130, whereby the positions of the light guide plate 123 and the LED assembly 129 are displaced, which is generated as a lifting part of the light guide plate 123. Light leakage can be prevented.

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

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

FIG. 2 is an enlarged cross-sectional view of region A of FIG. 1. FIG.

Figure 3 is a photograph showing a light leakage phenomenon occurring in the prior art.

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

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

FIG. 6 is an enlarged view of region B of FIG. 5;

Claims (10)

Covertum; A reflection plate seated on the cover top; 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 having a rectangular frame shape in which the LED assembly is arranged along one side edge, and including a light leakage preventing jaw inside the rectangular frame; A plurality of optical sheets seated on the light guide plate; A liquid crystal panel seated on the plurality of optical sheets; A top cover that covers an upper edge of the liquid crystal panel and is coupled to the support main and the cover bottom And the light leakage preventing jaw prevents light emitted from the LED assembly from being directly incident on the liquid crystal panel through an optical sheet. The method of claim 1, And the support main includes a first jaw at one edge of the LED assembly. The method of claim 2, The light leakage preventing jaw is a liquid crystal display module, characterized in that the upper surface is formed in the same plane extends to the end of the first jaw. The method of claim 3, wherein And the thickness of the light leakage preventing jaw is twice the thickness of the first jaw. The method of claim 2, And 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 jaw. The method of claim 1, And the support main part includes a first jaw and a second jaw extending from the first jaw at one edge of the LED assembly. The method of claim 6, The light leakage preventing jaw is a liquid crystal display module, characterized in that the upper surface is formed in the same plane extending to the end of the second jaw. The method of claim 7, wherein And the thickness of the light leakage preventing jaw is twice the thickness of the second jaw. The method of claim 6, The liquid crystal panel is supported by the upper surface of the first jaw, the upper surface of the second jaw is attached to the (curtain tape), the lower surface of the first and second jaw LED Liquid crystal display module, characterized in that the assembly is attached. The method of claim 1, The LED assembly is characterized by consisting of a plurality of LEDs emitting red (R), green (G), blue (B) color light, respectively, and a flexible printed circuit board (FPCB) in which the LEDs are mounted at regular intervals. LCD display module.

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