KR101150197B1 - Back light assembly and liquid crystal display module using thereof - Google Patents

Abstract

The present invention provides a backlight assembly having a lamp housing capable of guiding a fluorescent lamp in a longitudinal direction to concentrate light generated therefrom to the side of the light guide plate and at the same time efficiently conducting and removing high-temperature heat generated from the fluorescent lamp electrode unit. And it relates to a liquid crystal display module using the same.

To this end, the present invention is a reflection sheet; A light guide plate seated on the reflective sheet; A fluorescent lamp arranged on at least one side of the light guide plate and having electrode portions at both ends; A lamp housing formed by enclosing and guiding the upper and lower sides of the fluorescent lamp in a longitudinal direction and having a reflective film formed on the remaining portion of the inner surface facing the fluorescent lamp except for a portion corresponding to the electrode part; Provided are a backlight assembly for a liquid crystal display device including a plurality of optical sheets interposed on an upper part of the light guide plate, and a liquid crystal display device module using the same.

As a result, it is possible to easily remove the high temperature heat generated from the electrode portions of the both ends without deteriorating the efficiency of the fluorescent lamp has the advantage of extending the life of the liquid crystal display device, including the fluorescent lamp.

Description

Back light assembly and liquid crystal display module using the same

1 is a cross-sectional view of a general liquid crystal display device.

2 is a perspective view of a typical lamp housing.

3 is a cross-sectional view taken along the line III-III of FIG. 2;

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

5 is a perspective view of a lamp housing according to the present invention;

FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5; FIG.

<Description of the symbols for the main parts of the drawings>

110: liquid crystal panel 112, 114: first and second substrate

116: TCP 118,119: gate and data drive circuit

120: backlight assembly 122: reflective sheet

124 fluorescent lamp 126 glass tube

128: electrode 130: light guide plate

132: optical sheet 140: lamp housing

142: reflecting film 150: lamp holder

152: side support 154: cover bottom

156: banding section 158: top cover

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight assembly for a liquid crystal display device and a liquid crystal display module using the same. More specifically, a fluorescent lamp is guided in a longitudinal direction. And a lamp housing having a lamp housing capable of concentrating the light generated from the light guide panel side and efficiently dissipating high temperature heat generated from the electrode portions of the fluorescent lamp. An assembly and a liquid crystal display module using the same.

In recent years, as the society enters a full-scale information age, the display field that visually expresses various electrical signal information has been rapidly developed, and in response to this, various displays having excellent characteristics such as thinning, light weight, and low power consumption have been developed. The flat panel display device (FPD) is introduced to quickly replace the existing cathode ray tube (CRT).

Specific examples of such a flat panel display device include a liquid crystal display device (LCD), a plasma display panel device (PDP), a field emission display device (FED), and an electroluminescent display device. (Electroluminescence Display device: ELD) and the like, the dual liquid crystal display device is particularly used in the field of notebooks, monitors, TVs, etc., especially because the contrast ratio (large contrast ratio) is large and excellent in moving image display.

On the other hand, a general liquid crystal display device has an image realization principle using optical anisotropy and polarization property of liquid crystal. As is well known, a liquid crystal has a thin and long molecular structure, and has an optical anisotropy having an orientation in an array and a molecule depending on its size when placed in an electric field. It has a polarization property in which the direction of arrangement changes.

Accordingly, a liquid crystal display device includes a liquid crystal panel formed by bonding a pair of substrates on which a transparent field generating electrode is formed to face each other with a liquid crystal layer interposed therebetween, and a backlight assembly for supplying light thereto. light assembly) and change the transmittance by changing the arrangement direction of the liquid crystal molecules through the electric field between the two field generating electrodes of the liquid crystal panel, and then pass the light emitted from the backlight assembly to the outside. To express.

Recently, the active matrix type, in which pixels, which are basic units of image expression, is arranged in a matrix manner on a liquid crystal panel, and each of them is independently controlled by using a thin film transistor (TFT), is a color. It is widely used because of its excellent reproducibility and video display.In this case, the backlight assembly is used as a light source for generating light, or a cold cathode fluorescent lamp (CCFL) or an external electrofluorescent lamp (EEFL). Is provided.

In this case, the backlight assembly for a general liquid crystal display device has a side light type in which light of a fluorescent lamp disposed at one edge of the rear side of the liquid crystal panel is refracted by a light guide plate and entered the front of the liquid crystal panel according to the arrangement of the fluorescent lamps. Alternatively, a plurality of fluorescent lamps may be arranged on the rear surface of the liquid crystal panel, and may be classified into a direct type for directly supplying light over the entire liquid crystal panel.

1 is a cross-sectional view of a liquid crystal display device of a general metering method, and since the liquid crystal panel 10 and the backlight assembly 20 are integrally modularized through a predetermined mechanical element, collectively referred to as a liquid crystal display module, As can be seen, the general liquid crystal display module includes a liquid crystal panel 10 and a backlight assembly 20 which are stacked up and down, and the edges thereof are surrounded by an approximately square frame support main (support main: 46). A cover bottom 44 serving as a surface covers the back of the backlight assembly 20 and is coupled to the support main 46 to maintain the overall shape and to minimize light loss and to integrate all of them. Top cover (48) of the rectangular frame shape that borders the front edge of the) is assembled to the support main 46 and the cover bottom 44.

The dual backlight assembly 20 includes a white or silver reflective sheet 22 covering the inner surface of the cover bottom 44, a fluorescent lamp 24 arranged along at least one edge of the support main 46, and The light guide panel 26 is seated on the reflective sheet 22 so as to have the same plane position as the fluorescent lamp 24, and covers at least one light guide panel 26 facing the fluorescent lamp 24 and the light guide plate 26. And a plurality of optical sheets 28, such as a prism sheet and a diffuser sheet, in addition to the fluorescent lamps so that the light emitted from the fluorescent lamps 24 is concentrated on the light guide plate 26 side. A lamp housing 30 is provided to surround and guide three directions on the upper and lower sides along the longitudinal direction of 24.

As a result, the light emitted from the fluorescent lamp 24 is incident on the side of the light guide plate 26 by the lamp housing 30 and refracted in the direction of the liquid crystal panel 10, and then passes through the optical sheet 28 to a high quality of uniform luminance. It is processed and supplied to the liquid crystal panel 10.

In this case, as shown in the drawing, a plurality of fluorescent lamps 24 may be arranged in a plurality of two or more layers to achieve high brightness. Lamp holder 40 can be used. In addition, if necessary, the plurality of fluorescent lamps 24 group may be arranged to face both sides of the light guide plate 26 facing each other.

Meanwhile, the lamp housing 30, which is one of the components of the backlight assembly 20 described above, concentrates the light emitted from the fluorescent lamp 24 toward the light guide plate 26 and at the same time, the fluorescent lamp 24 is prevented from external shock. In particular, the inner surface thereof is a reflection film for increasing the light reflection efficiency is interposed therebetween, the reflection film may be coated with a separate synthetic resin film having a high reflection efficiency to the inner surface of the lamp housing 30 or may be configured as part of the reflective sheet 22. Do.

2 is a perspective view of a general lamp housing 30 and FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 2. Referring to FIG. 1, the general lamp housing 30 is generally a light guide plate. The cross-sectional shape perpendicular to the longitudinal direction is roughly a c-shape so as to guide the upper and lower three directions of the fluorescent lamp 24 except for the inner side toward the 26, and the inner surface facing the fluorescent lamp 24 has a high reflection efficiency of light. The reflective film 32 is formed. The reflective film 32 is completed by coating an appropriate synthetic resin or the like along the inner surface of the lamp housing 30 or by bending the two stages so that the end of the corresponding reflective sheet 22 is upward and inward. After the same shape as the inner surface of the lamp housing 30 can be completed in close contact with the inner surface, such a reflective film 32 to prevent the loss of light and the light emitted from the fluorescent lamp 24 to the maximum light guide plate ( 26) It focuses on the side.

However, in the general liquid crystal display module having the above-described structure, the temperature inside the lamp housing 30 gradually increases due to the fact that a high temperature heat generated from the fluorescent lamp 24 is not provided. As a result, the lifespan of the fluorescent lamp 24 is greatly shortened, and there is a problem that a frequent failure follows.

In particular, the general fluorescent lamp 24 is a relatively high temperature heat is generated in the electrode portion of both ends, which causes the lamp holder 40 surrounding the corresponding portion to appear to melt, in order to prevent the normal lamp holder 40 However, the high heat resistance of silicon is used as the material of). Nevertheless, the siloxane, which is a polymer material in silicon, is dissolved and eluted.

Accordingly, an object of the present invention is to provide a liquid crystal display backlight assembly and a liquid crystal display device using the same, which can effectively remove high temperature heat generated from an electrode of a fluorescent lamp. .

To this end, the present invention specifically aims to achieve the above object through a lamp housing, and guides the fluorescent lamp in the longitudinal direction to concentrate the light generated from the light guide plate side and at the same time generated at the electrode portions at both ends of the fluorescent lamp. It is an object of the present invention to provide a backlight assembly having a lamp housing capable of efficiently conducting and removing high temperature heat and a liquid crystal display module using the same.

The present invention and the reflective sheet to achieve the above object; A light guide plate seated on the reflective sheet; A fluorescent lamp arranged on at least one side of the light guide plate and having electrode portions at both ends; A lamp housing formed by enclosing and guiding the upper and lower sides of the fluorescent lamp in a longitudinal direction and having a reflective film formed on the remaining portion of the inner surface facing the fluorescent lamp except for a portion corresponding to the electrode part; Provided is a backlight assembly for a liquid crystal display device including a plurality of optical sheets interposed on an upper part of the light guide plate.

At this time, the lamp housing is characterized in that the aluminum material.

In addition, the reflective film is a synthetic resin coating film having a high reflection efficiency coated on the inner surface of the lamp housing, wherein the coating film is made of one or more selected from PVC, ABS, PET, or the reflective film of the reflective sheet facing the fluorescent lamp It consists of at least one end, in this case at least one end of the reflective sheet is characterized in that the two stages are bent inward and then upward in close contact along the inner surface of the lamp housing.

In addition, the at least two fluorescent lamps are arranged in a plurality of layers, characterized in that it further comprises a pair of lamp holders of silicon material surrounding the electrode portion of each of the at least two fluorescent lamps arranged in multiple layers.

In addition, the present invention provides a liquid crystal display module having a backlight assembly according to the above description, comprising: a liquid crystal panel mounted on the optical sheet; A support main frame that borders the backlight assembly and the liquid crystal panel; A cover bottom covering the rear surface of the reflective sheet; Provided is a liquid crystal display module including a top cover bordering a front edge of the liquid crystal panel.

The cover bottom may further include a bending portion protruding upward along at least one side edge, and the bending portion is in close contact with the outer surface of the lamp housing.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

4 is an exploded perspective view of the liquid crystal display module according to the present invention, wherein the support main body 152 formed of a synthetic resin or a sustain steel mold having a substantially rectangular frame is stacked up and down and the liquid crystal display assembly 120 and the liquid crystal display. The cover bottom 154, which borders the edge of the panel 110 and serves to maintain the overall shape and prevent light loss, is coupled to the support main 152 while covering the rear surface of the backlight assembly 120. The top cover 158 bordering the front edge of the liquid crystal panel 110 is coupled to the support main 152 to integrate the whole.

More specifically, first, the liquid crystal panel 110 includes a pair of first and second substrates 112 and 114 bonded to each other with the liquid crystal layer interposed therebetween as a part that plays a key role in image expression.

At this time, although not clearly shown in the drawings, a plurality of gate lines and data lines intersect on the inner surface of the first substrate 112 called a lower substrate or an array substrate to define pixels, and at each intersection point. A thin film transistor (TFT) is provided and is connected one-to-one with a pixel electrode mounted in each pixel. In addition, an inner surface of the second substrate 114 called an upper substrate or a color filter substrate may correspond to each pixel, for example, a color filter of R, G, and B colors, bordering each of them, and including gate lines, data lines, and the like. A black matrix covering non-display elements such as a thin film transistor is provided, and a common electrode covering them is provided.

In addition, the driving circuits 118 and 119 are connected through at least one edge of the liquid crystal panel 110 through a flexible circuit board or a tape carrier package (TCP: 116) and the like. The driving circuits 118 and 119 are appropriately flipped and adhered to the side surface or the back cover 154, respectively, and the gate driving circuit 118 scan-transmits the on / off signal of the thin film transistor to a plurality of gate lines, and a plurality of data. It is divided into a data driver circuit 119 for transmitting frame-by-frame image signals to a line and may be connected to two adjacent edges of the liquid crystal panel 110, respectively.

Accordingly, in the liquid crystal display module according to the present invention, when the thin film transistor selected for each gate line is turned on by the on / off signal of the gate driver circuit 118 which is scanned and transmitted, the signal voltage of the data driver circuit 119 becomes data. It is transmitted to the corresponding pixel electrode through the line, and the arrangement direction of the liquid crystal molecules is changed by the vertical electric field between the pixel electrode and the common electrode, thereby representing the transmittance difference.

In addition, in the liquid crystal display module according to the present invention, the backlight assembly 120 is provided on the rear surface of the liquid crystal panel 110 so that the difference in transmittance is expressed to the outside, thereby providing light, which covers the inner surface of the cover bottom 154. A white or silver reflective sheet 122, a fluorescent lamp 124 arranged along an inner longitudinal direction of at least one edge 153 of the support main 152 corresponding to an edge portion of the reflective sheet 122, The light guide plate 130 mounted on the reflective sheet 122 to be coplanar with the same fluorescent lamp 124 and a plurality of optical sheets 132 interposed thereon.

Accordingly, the fluorescent lamp 124 faces at least one side of the light guide plate 130, and the upper and lower sides of the fluorescent lamp 124 may be focused on the light guide plate 130 corresponding to light emitted from the fluorescent lamp 124. The lamp housing 140 surrounding the cover is interposed along at least one edge 153 of the support main 152 together with the fluorescent lamp 124. In this case, at least one edge 153 of the support main 152 in which the fluorescent lamp 124 is arranged may be opened as shown in the drawing.

Therefore, the light emitted from the fluorescent lamp 124 is concentrated on the side of the light guide plate 130 by the lamp housing 140 and proceeds to be deflected toward the liquid crystal panel 110. During the passage of the sheet 132, it is processed to a high quality of uniform brightness and irradiated to the liquid crystal panel 110.

In this case, in particular, two or more fluorescent lamps 124 of the liquid crystal display module according to the present invention may be arranged in a plurality of upper and lower layers, and electrode portions 128 which are opposite ends of the plurality of fluorescent lamps 124 may be integrated. ), A pair of lamp holders 150 may be used. In addition, the plurality of fluorescent lamps 124 forming the multilayer structure may be arranged to face each side of the light guide plate 130 facing each other, and the lamp holder 150 may be made of a silicon material.

At this time, the lamp housing 140 for guiding the fluorescent lamp 124 in the longitudinal direction among the respective components of the liquid crystal display module according to the present invention is directed to the light guide plate 130 side light generated from the fluorescent lamp 124. While concentrating and protecting the fluorescent lamp 124 and at the same time it is characterized in that the high-temperature heat generated by the electrode portion 128 of the fluorescent lamp 124 can be efficiently released, for this purpose, the lamp housing 140 The reflective film 142 is formed only on the remaining portion of the inner surface facing the fluorescent lamp 124 except for the portion corresponding to the electrode portion 128.

More specifically, Figure 5 is a perspective view showing only the lamp housing 140 of the liquid crystal display module according to the present invention and Figure 6 is a cross-sectional view of the VI-VI line shown here with reference to the fluorescent lamp in dotted lines as reference. 4, the lamp housing 140 according to the present invention surrounds three directions of up and down along the longitudinal direction thereof so as to guide the fluorescent lamp 124 therein. As a result, the shape of the cross section perpendicular to the longitudinal direction shows an approximately C-shape in which the inner side toward the light guide plate 130 is opened.

In addition, a reflective film 142 is formed on an inner surface of the lamp housing 140. The reflective film 142 is an inner surface of the lamp housing 140, and has a high reflection efficiency of polyvinyl chloride (PVC) or ABS (Acrylonitrile Butadiene). Finished by coating a synthetic resin material such as Styrene) or PET (PolyEthylene Terephthalate), or by bending the two ends so that the end of the corresponding reflective sheet 122 is upward and inward, the shape is substantially the same as the inner surface of the lamp housing 140. After contacting to the inner surface of the lamp housing 140 can be completed.

In this case, in particular, the reflective film 142 of the inner surface of the lamp housing 140 according to the present invention is formed of only the remaining portions except for the portion corresponding to the electrode portion 128 of the fluorescent lamp 124, and thus the fluorescent lamp 124 The electrode unit 128 is characterized in that it is directly exposed to the lamp housing 140, wherein the lamp housing 140 may be made of aluminum as an example of a metal having excellent conductivity, so that the lamp housing according to the present invention ( 140 is a portion of the fluorescent lamp 124 corresponding to the glass tube 126 that emits light substantially, so that the reflective film 142 is present, and heat of relatively high temperature is generated without reducing the reflection efficiency. The portion corresponding to the electrode portion 128 at both ends of the fluorescent lamp 124 that does not emit light does not have a reflective film 142 so as to face the lamp housing 140 made of aluminum.

Therefore, the high temperature heat generated from the electrode portions 128 of the fluorescent lamp 124 is directly radiated and conducted to the lamp housing 140 made of aluminum, in which the reflective film 142 is not formed.

In addition, the bending portion upwardly bent at one edge of the cover bottom 154 toward the lamp housing 140 so that heat of the electrode portions 128 at both ends of the fluorescent lamp 124 transferred to the lamp housing 140 can be more easily discharged. 156 may be provided to be in close contact with the outer surface of the lamp housing 140, and the cover bottom 154 may also be made of a metal material such as aluminum having high thermal conductivity, and the electrode portions 128 at both ends of the fluorescent lamp 124 may be provided. The high temperature heat generated in the) can be easily conducted and removed to the cover bottom 154 through the end portions of the lamp housing 140 corresponding to the respective ones and the reflective film 142 is removed.

Meanwhile, in the above description, the fluorescent lamp 124 may be either an external electrode fluorescent lamp or a cold cathode fluorescent lamp. Thus, a key technical idea of the present invention is to guide the fluorescent lamp 124 in the longitudinal direction and to generate the fluorescent lamp 124. Electrodes 128 at both ends of the fluorescent lamp 124 to concentrate light toward the side of the light guide plate 130 and to efficiently conduct conduction of high temperature heat generated from the electrode unit 128 of the fluorescent lamp 124. Disclosed is a backlight assembly 120 and a liquid crystal display module having a lamp housing 140 in which a reflective film 142 is formed only in portions other than those corresponding to the present invention. It should be understood that all belong to the present invention, and those skilled in the art will clearly understand the present invention with reference to the following claims.

As described above, the backlight assembly and the liquid crystal display module according to the present invention exhibit an advantage of easily removing high-temperature heat generated from both ends of the fluorescent lamp.

Therefore, unlike the general case, the lamp holder is melted and eluted, and there is no problem such as extending the life of the fluorescent lamp and forming a reflective film with high reflection efficiency on the inner surface of the lamp housing corresponding to the glass tube that emits light substantially. In addition, there is an advantage that does not lower the lamp efficiency, such as lowering the brightness.

Claims (9)

A reflective sheet; A light guide plate seated on the reflective sheet; A fluorescent lamp arranged on at least one side of the light guide plate and having electrode portions at both ends; A lamp housing formed by enclosing and guiding the upper and lower sides of the fluorescent lamp in a longitudinal direction and having a reflective film formed on the remaining portion of the inner surface facing the fluorescent lamp except for a portion corresponding to the electrode part; A plurality of optical sheets interposed above the light guide plate Backlight assembly for a liquid crystal display device comprising a. The method of claim 1, The lamp housing is an aluminum backlight assembly for a liquid crystal display device. The method of claim 1, The reflective film is a backlight assembly for a liquid crystal display device having a high reflective efficiency coating film coated on the inner surface of the lamp housing. The method of claim 3, The coating film is a backlight assembly for a liquid crystal display device consisting of at least one selected from PVC, ABS, PET. The method of claim 3, The reflective film is a backlight assembly for at least one side of the reflective sheet facing the fluorescent lamp. The method of claim 5, And at least one end of the reflective sheet is bent in two stages upwardly and inwardly to be in close contact with the inner surface of the lamp housing. The method of claim 1, At least two fluorescent lamps are arranged in multiple layers, And a pair of lamp holders of silicon material surrounding electrode portions of each of the at least two fluorescent lamps arranged in a plurality of layers. A liquid crystal display module comprising a backlight assembly according to any one of claims 1 to 7, A liquid crystal panel seated on the optical sheet; A support main frame that borders the backlight assembly and the liquid crystal panel; A cover bottom covering the rear surface of the reflective sheet; Top cover that borders the front edge of the liquid crystal panel Liquid crystal display module comprising a. The method of claim 8, The cover bottom further includes a bending portion protruding upward along at least one side edge, wherein the bending portion is in close contact with an outer surface of the lamp housing.

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