KR20090023795A - Liquid crystal display device module including a light emitting diode array - Google Patents

Abstract

A liquid crystal display device module including a light emitting diode array is provided to prevent a reflecting plate from being inserted into an effective display area. A cover bottom(115) is positioned in the lowest portion. A main supporter(140) surrounds an edge on a cover bottom. A reflective plate(130) comprises a horizontal unit(130a), a bending unit(130b), an extension unit(130c) and a reflective plate fixing unit(180). The horizontal unit is settled on the cover bottom. The bending unit is extended vertically on the horizontal unit. The extension unit is extended in a direction of the horizontal unit in the bending unit. The reflective plate fixing unit is protruded in both ends of the extension unit. A light guide plate(125) is on the top of the reflective plate.

Description

Liquid Crystal Display Device Module including A Light Emitting Diode Array}

The present invention relates to a liquid crystal display module, and more particularly, to improving light efficiency in a backlight unit using an LED array as a light source.

In general, the liquid crystal display, which is one of the flat panel display devices, has a better visibility than the cathode ray tube (CRT) and is smaller than the cathode ray tube of the screen size having the same average power consumption. Along with the devices and the field emission display devices, they are recently attracting attention as the next generation display devices for mobile phones, computer monitors, and televisions.

The driving principle of the liquid crystal display device is to use optical anisotropy and polarization property of the liquid crystal. The liquid crystal has a long and thin structure, and thus the liquid crystal has directivity in the arrangement of the molecules. can do.

Accordingly, if the molecular arrangement direction of the liquid crystal is arbitrarily adjusted, the molecular arrangement of the liquid crystal is changed, and light is refracted in the molecular arrangement direction of the liquid crystal due to optical anisotropy to express image information.

However, since the liquid crystal display is a light-receiving element that does not emit light by itself, it requires a separate light source, and the light emitted from the backlight unit serving as the light source is incident on the liquid crystal panel and the light transmitted through the arrangement of the liquid crystals. The amount is adjusted to display an image.

Hereinafter, a liquid crystal display module according to the related art will be described with reference to the accompanying drawings.

1 is an exploded perspective view showing a conventional liquid crystal display module.

As shown in the drawing, the conventional liquid crystal display module 5 includes a cover bottom 15 positioned at the bottom, a main supporter 40 surrounding an edge on the cover bottom 15, and an upper portion of the cover bottom 15. A reflector 30 configured in the above, a light guide plate 25 formed on the reflective plate 30, a plurality of optical members 35 mounted on the light guide plate 25, and an inner side of the main supporter 40. The liquid crystal panel 45 is disposed at both ends of the LED array 60 spaced apart from the light guide plate 25 at the end, the liquid crystal panel 45 on the optical member 35, and inner ends of the main supporter 40. It includes a panel guide 50 for supporting, and a top cover 70 surrounding the edge of the liquid crystal panel 45.

In this case, the reflector 30 is made of an aluminum material having good reflectance, the optical member 35 is a diffusion sheet, prism sheet and protective sheet for the purpose of improving the light efficiency. It can be comprised in the form which laminated | stacked many films, such as a sheet).

The reflector 30, the light guide plate 25, the optical member 35, and the LED array 60 may be referred to as a backlight unit 10.

At this time, the above-described backlight unit 10 is not provided with a reflecting means in the spaced apart space between the LED array 60 and the light guide plate 25 designed in the side, in particular in the upper direction of the LED array 60, There was a problem that light at the portion was scattered and the light efficiency was lowered.

In order to improve the above-mentioned problem, the LED array (not shown) by applying a 'c' shaped rolled up reflector 30 to the upper side of the LED array 60 to wrap the LED array 60 ( A method that can improve light efficiency by inducing light from 60 to be reincident to the light guide plate 25 is generally used.

Hereinafter, a backlight unit including the aforementioned 'c' shaped reflector will be described in detail with reference to the accompanying drawings.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, and in detail, a cross-sectional view illustrating a fastening state of a backlight unit to which a 'c' shaped reflector is applied.

As shown in the drawing, the conventional backlight unit (10 of FIG. 1) includes a horizontal portion 30a formed in a plate shape on the cover bottom 15, and a refraction portion 30b extending vertically from the horizontal portion 30a. And a 'c' shaped reflector 30 including an extension part 30c extending from the refracting part 30b in the direction of the horizontal part 30a, and a light guide plate 25 formed on the reflecting plate 30. ), A plurality of optical members 35 mounted on the light guide plate 25, and an LED array 60 spaced apart from the light guide plate 25 and surrounded by the reflective plate 30. The liquid crystal panel 45 is positioned on the optical member 35.

At this time, the liquid crystal panel 45 on the optical member 35 is arranged in the panel guide (50 in FIG. 1) located on both short sides of the main supporter (40 in FIG. 1). Although not shown in detail in the drawings, the 'c' shaped reflector 30 may be manufactured in one piece or separate type.

The LED array 60 includes a plurality of light emitting diodes 60a configured at predetermined intervals in one direction, a metal printed circuit board 60b on which the plurality of light emitting diodes 60a are mounted, and the metal PCB. And a plurality of lead wires (not shown) for connecting 60b to an inverter (not shown) located on the rear surface of the cover bottom 15. Although not shown in detail in the drawings, the lead wires are respectively separated into a positive electrode and a negative electrode and connected to the positive and negative ends.

The metal PCB 60b is connected to an inverter (not shown) located on the rear surface of the cover bottom 15 through a plurality of lead wires (not shown) separated on both sides, and applies a current from the inverter (not shown). The light emitted from the received LED array 60 is incident on the light guide plate 25, and then passes through the optical member 35 and the liquid crystal panel 45 in the vertical direction by the light guide plate 25 to obtain a desired image. Will be displayed.

In this case, a plurality of openings F are provided in the refraction portion 30b of the reflector to allow the plurality of light emitting diodes 60a to pass therethrough, and include the light emitting diodes 60a through the openings F. The LED array 60 and the reflecting plate 30 are configured to be in close contact.

However, the aforementioned 'c' shaped reflection plate 30, in particular, the extension portion 60c of the reflection plate is produced in a simply folded state without a separate fixture, so the lifting phenomenon when the backlight unit (10 of FIG. 1) is fastened It is causing problems.

Hereinafter, the above-mentioned lifting phenomenon will be described in detail with reference to the accompanying drawings.

3A and 3B are diagrams for explaining a lifting phenomenon, FIG. 3A is a perspective view schematically illustrating a conventional backlight unit, and FIG. 3B is a cross-sectional view taken along line IIIb-IIIb of FIG. 3A and illustrates the backlight unit. The fastening state is shown.

As shown in FIG. 3A and FIG. 3B, the LED array 60 comprises a plurality of light emitting diodes 60a mounted on the metal PCB 60b at a predetermined distance in one direction. At this time, the size of the liquid crystal panel 45 of the liquid crystal display module is different, but the number of light emitting diodes (60a) is also increasing to meet the demand of high brightness.

However, an increase in the number of the light emitting diodes 60a also increases the number of the openings F of the reflecting plate 30, so that the separation distance between the openings F and the openings F of the reflecting plate 30 becomes dense. As a cause, it is difficult for the refraction portion 30b and the extension portion 30c of the reflector to form a right angle.

In detail, the LED array 60 and the reflecting plate 30 surrounding the LED array 60 and the reflecting plate 30 are included in the assembly of the liquid crystal display module including the reflecting plate 30 that is simply folded without a separate fixture. Due to poor assembly between the light guide plate 25 and the optical member 35 stacked on the upper surface, the angle formed by the horizontal portion 30a and the refraction portion 30b of the reflecting plate does not form a right angle and is biased toward the effective display area AA. Defects that are assembled in an acute angle form frequently occur.

As a result of the above-described assembly failure, the reflector 30 does not completely block the LED array 60, and light from the LED array 60 leaks in the up / left / right directions, causing significant light loss. Doing.

The biggest advantage of applying the 'c' shaped reflector 30 is to induce the light leaking to the upper side of the LED array 60 to be re-entered into the light guide plate 25, but for the reasons described above The situation is not fully utilizing the advantages of the reflector 30.

In addition, the above-described configuration is a situation that requires unnecessary work that the operator must check the fixing position of the reflector 30 in order to reduce the assembly failure.

In order to solve this problem, an attempt is made to use an attachment means (not shown) such as a double-sided tape on the metal PCB 60b or the light guide plate 25 so as to fix the reflective plate 30 and the metal PCB 60b. However, such an attachment means is difficult to apply because there is a risk of worsening the light efficiency by acting as a path for the generation of foreign matter in the future.

The present invention has been made to solve the above-described problem, and an object thereof is to maximize light efficiency of a backlight unit by preventing the reflection plate from penetrating into the effective display area.

According to an exemplary embodiment of the present invention, a liquid crystal display module includes a cover bottom, a main supporter surrounding an edge on the cover bottom, a horizontal portion seated in a plate shape on the cover bottom, and perpendicular to the horizontal portion. A reflection plate including an extended refraction portion, an extension portion extending from the refraction portion in the horizontal direction direction, reflecting plate fixing means protruding from both ends of the extension portion, a light guide plate formed on the reflection plate, and a light guide plate on the light guide plate. A plurality of optical members mounted on the LED array, an LED array spaced from the light guide plate and surrounded by the reflective plate, a liquid crystal panel on the optical member, an internal structure of a backlight unit supporting the liquid crystal panel and fixing the reflective plate, It characterized in that it comprises a top cover surrounding the edge of the liquid crystal panel.

In this case, the LED array includes a plurality of light emitting diodes configured at regular intervals in one direction, a metal PCB on which the plurality of light emitting diodes are mounted, and a plurality of LEDs connecting the metal PCB to an inverter located on a rear surface of the cover bottom. It includes a lead wire.

In addition, the light emitting diode is a white light emitting diode is used, the internal structure of the backlight unit is characterized in that the panel guide. The panel guide further includes a wire holder configured to protrude to one end.

At this time, the reflecting plate fixing means is fixed by the wire holder. And, bypassing the wire holder, and further comprises a wire groove composed of a constant depth along the edge of the main supporter. The reflector is designed to have a '' 'shape surrounding the LED array.

In the present invention, first, it is possible to maximize the light efficiency of the LED array through the reflector fixing means. Second, there is an effect of preventing the reflection plate from penetrating into the effective display area by the reflection plate fixing means. Third, the fixing position checking operation may be omitted when the liquid crystal display module is assembled.

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According to the present invention, in the backlight unit to which the '-' shaped reflector is applied, reflector fixing means are formed at both ends of the reflector to prevent sagging of the reflector, and the reflector fixing means is fixed to the internal structure of the backlight unit. It is characterized by blocking the flow of the reflector at the source.

Hereinafter, a liquid crystal display module according to the present invention will be described with reference to the accompanying drawings.

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

As shown, the liquid crystal display module 105 of the present invention includes a cover bottom 115 positioned at the bottom, a main supporter 140 surrounding an edge on the cover bottom 115, and the cover bottom 115. A horizontal portion 130a seated in a plate shape on the plate, a refraction portion 130b vertically extending from the horizontal portion 130a, and an extension portion extending in the direction of the horizontal portion 130a from the refraction portion 130b. And a 'c' shaped reflector 130 including reflector fixing means 180 protruding from both ends of the extension part 130c, and a light guide plate configured on the reflector 130. And a plurality of optical members 135 mounted on the light guide plate 125, an LED array 160 spaced apart from the light guide plate 125 and surrounded by the reflector plate 130, and the optical member 135. ) And the liquid crystal panel 145 on both ends of the inner short side of the main supporter 140. It wraps around the edges of the guide panel 150 and the liquid crystal panel 145 that includes a top cover 170.

At this time, the reflecting plate 130 is made of an aluminum material having a good reflectance, and it is common to design the horizontal portion 130a and the extension portion 130c of the reflecting plate to be in parallel. The optical member 135 may be formed in such a manner that a plurality of films, such as a diffusion sheet, a prism sheet, and a protective sheet, are sequentially stacked for the purpose of improving light efficiency. .

The reflective plate 130, the light guide plate 125, the LED array 160, and the optical member 135 may be referred to as a backlight unit 110.

The LED array 160 includes a plurality of light emitting diodes 160a configured at predetermined intervals in one direction, a metal PCB 160b for mounting the plurality of light emitting diodes 160a, the metal PCB 160b and the It includes a plurality of lead wires (not shown) for electrically connecting an inverter (not shown) located on the back of the cover bottom 115.

The metal PCB 160b may use a conductive metal material, and the light emitting diode 160a may use a white light emitting diode.

In this case, the plurality of lead wires (not shown) extending to both ends of the metal PCB 160b may include a wire holder 165 protruding to one end of the panel guide 150, and the wire holder 165. And are neatly laid by wire grooves (not shown) having a constant depth.

The wire holder 165 is an internal structure of the backlight unit 110 installed to prevent a plurality of lead wires from escaping the wire grooves (not shown). The wire holder 165 may have various shapes and shapes according to the structure of the backlight unit 110. It may be designed, but it is generally configured integrally with the panel guide 150.

The metal PCB 160b is connected to an inverter (not shown) positioned on the rear surface of the cover bottom 115 through lead wires (not shown) on both sides, and the LED array (not shown) receives a current from the inverter (not shown). The light emitted from the 160 is incident on the light guide plate 125 and then passes through the optical member 135 and the liquid crystal panel 145 in a state where the light guide plate 125 stands up vertically to display a desired image.

At this time, in the present invention, the reflecting plate fixing means 180 is fixed to the internal structure of the backlight unit 110, in particular, the wire holder 165 located at one end of the panel guide 150 adjacent to the reflecting plate 130 and the LED array ( 160 to maximize the light efficiency.

This will be described in detail with reference to the accompanying drawings.

5 is a perspective view schematically illustrating a backlight unit according to the present invention, and FIG. 6 is an enlarged plan view of a portion A of FIG. 5 and illustrates an assembly state of the backlight unit.

As shown, the backlight unit (110 of FIG. 4) according to the present invention is a horizontal portion (130a of FIG. 4) seated in a plate shape on the cover bottom 115 covering the edge of the main supporter 140, the horizontal A refraction portion (130b in FIG. 4) extending vertically from the portion, an extension portion (130c) extending from the refraction portion in the direction of the horizontal portion (130a in FIG. 4), and both ends of the extension portion (130c). The reflector plate 130 includes a protruding reflector plate fixing means 180, a light guide plate 125 formed on the reflector plate 130, and one side end spaced from the light guide plate 125 by the reflector plate 130. The wrapped LED array (160 in FIG. 4) is included.

At this time, the lead wires 168 of both sides extending from the LED array (160 in FIG. 4) have a predetermined depth bypassing the wire holder 165 located at one end of the panel guide 150 and the wire holder 165. And is aligned neatly by the wire groove 167 formed along the edge of the main supporter 140.

In the present invention, the 'c' shaped reflector through fixing the reflector plate fixing means 180 designed to extend from the reflector plate 130 to the wire holder 165 configured at one end of the panel guide 150 It is characterized by blocking the flow of the 130 at the source.

That is, the above-described configuration is a structure in which the reflecting plate fixing means 180 is fixed by the wire holder 165, and there is no fear that the reflecting plate 130 is separated from the effective display area AA. ) Has the advantage of maximizing the light efficiency.

In this case, the present invention has been described only with respect to the wire holder 165, but is not limited thereto. The structure in which the reflector fixing means 180 is fixed to the internal structure of the backlight unit 110 may be included.

In summary, in the present invention, the reflector fixing means 180 is configured to protrude from the extension 130c of the reflector, and the reflector fixing means 180 is formed on the internal structure of the conventional backlight unit 110 of FIG. Through the design to be fixed there is an advantage that can prevent the flow of the reflector 130 without additional costs.

In addition, when applying the 'c'-shaped reflecting plate 130 according to the present invention, it is accompanied by the advantage that the operator does not need to check the fixing position of the reflecting plate 130 one by one during the assembly process.

Therefore, in the present invention, the reflector plate fixing means is provided on the reflector plate designed to surround the LED array, and the light efficiency of the LED array can be maximized by fixing the reflector plate fixing means to the internal structure of the backlight unit.

However, it will be apparent that the present invention is not limited to the above embodiments and can be modified and changed in various forms without departing from the spirit and spirit of the present invention.

1 is an exploded perspective view showing a conventional liquid crystal display module.

2 is a cross-sectional view taken along the line II-II of FIG.

Figure 3a is a perspective view schematically showing a conventional backlight unit.

3B is a cross-sectional view taken along line IIIb-IIIb of FIG. 3A;

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

5 is a perspective view schematically showing a backlight unit according to the present invention.

6 is an enlarged plan view of a portion A of FIG. 5;

* Explanation of symbols for the main parts of the drawings *

105: liquid crystal display module 110: the backlight unit

115: cover bottom 125: light guide plate

130: reflector 140: main supporter

145: liquid crystal panel 150: panel guide

160: LED array 160a: light emitting diode

160b: metal PCB 165: wire holder

170: top case 180: reflector fixing means

Claims (8)

A cover bottom; A main supporter surrounding an edge on the cover bottom; Fixing the reflection plate consisting of a horizontal part seated on the cover bottom, a refraction part extending vertically from the horizontal part, an extension part extending from the refraction part toward the horizontal part, and protruding from both ends of the extension part. A reflector comprising a means; A light guide plate configured on the reflection plate, and a plurality of optical members mounted on the light guide plate; An LED array spaced apart from the light guide plate and surrounded by the reflection plate; A liquid crystal panel on the optical member; An internal structure of the backlight unit supporting the liquid crystal panel and fixing the reflection plate; Top cover surrounding the edge of the liquid crystal panel Liquid crystal display module comprising a. The method of claim 1, The LED array includes a plurality of light emitting diodes arranged at regular intervals in one direction, a metal PCB on which the plurality of light emitting diodes are mounted, and a plurality of lead wires connecting the metal PCB to an inverter located on a rear surface of the cover bottom. Liquid crystal display module comprising a. The method of claim 2, The light emitting diode is a liquid crystal display module, characterized in that the white light emitting diode is used. The method of claim 1, And an inner structure of the backlight unit is a panel guide. The method of claim 4, wherein The panel guide further comprises a wire holder configured to protrude to one end. The method according to claim 1 and 5, And the reflector fixing means is fixed by the wire holder. The method of claim 5, wherein And a wire groove configured to bypass the wire holder and have a predetermined depth along an edge of the main supporter. The method of claim 1, The reflective plate is a liquid crystal display module, characterized in that designed in a 'c' shape surrounding the LED array.

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