KR20050073817A - Flat light source device and liquid crystal display device thereof - Google Patents

Abstract

Disclosed are a surface light source device and a liquid crystal display device having the same, which can improve assembly performance. In order to improve the assemblability, the surface light source device is formed on a light source body portion having one or more discharge regions divided in a first direction and extending in a second direction crossing the first direction to be formed on both outer surfaces of the light source body portion. And, at least one surface of the outer surface includes an electrode having a shape that can be connected to the conductive wire to receive power supplied from the outside. As a result, the luminance of light emission becomes uniform, and a plurality of wires connected to the electrode unit can be formed by a single wire connection, thereby improving workability and reducing assembly time.

Description

Surface light source device and liquid crystal display having the same {FLAT LIGHT SOURCE DEVICE AND LIQUID CRYSTAL DISPLAY DEVICE THEREOF}

The present invention relates to a surface light source device and a liquid crystal display device using the same, and more particularly, to a surface light source device having a uniform luminance distribution and improved assemblability and a liquid crystal display device using the same.

In general, liquid crystal (LC) has both electrical and optical characteristics. The liquid crystal changes the arrangement of the liquid crystal corresponding to the direction of the electric field by the electrical characteristics. In addition, the liquid crystal changes the transmittance of light in response to the arrangement of the liquid crystal by optical properties. Liquid crystal display devices (LCDs) display images by using electrical and optical characteristics of liquid crystals.

Such a liquid crystal display requires a liquid crystal controlling part for controlling the liquid crystal and a light supplying part for supplying light to the liquid crystal.

Conventionally, the light supply part of a liquid crystal display device mainly uses a cold Cathode Fluorescent Lamp (CCFL) or a dot shaped Light Emitting Diode (LED). However, conventional cold cathode ray tube type lamps or light emitting diodes have a weak point in uniformity in common. In order to solve such luminance non-uniformity, the light supply part uses an optical member such as a light guide panel (LGP), a diffusion member, a prism sheet, and the like.

In addition, in order to solve the problem of increase in volume and weight, a surface light source is recently used as a light source of a light supply part. The surface light source includes a light source body in which the discharge space is formed so that the discharge gas is distributed in the discharge space, and an electrode for applying discharge power. In the surface light source device having the above configuration, since light is generated from the front surface of the light source body having a size similar to that of the liquid crystal control part, light uniformity and luminance are more uniform than that of the cold cathode ray tube method.

However, in the conventional surface light source device, a plurality of wires drawn from an external power supply means must be directly connected to an electrode or a plurality of wires finally bundled into a single wire in order to apply a discharge voltage. There is a problem that becomes long and complicated.

An object of the present invention for solving this problem is to provide a surface light source device having a uniform luminance distribution and improving workability by simplifying the assembly procedure.

Another object of the present invention to provide a liquid crystal display device using the surface light source device.

In accordance with one aspect of the present invention, there is provided a surface light source device including: a light source body having at least one discharge region divided in a first direction; And a shape extending from a second direction crossing the first direction to be formed on both outer surfaces of the light source body, and to which at least one surface of the light source body can be connected to receive the power supplied from the outside. It has an electrode part which has.

In addition, the liquid crystal display device for achieving the object of the present invention is formed on the light source body formed with a plurality of discharge regions in the first direction so that the discharge can be performed by the discharge gas, respectively formed on the outer surface of both sides of the light source body Projections are formed on at least one surface of the first electrode and the second electrode, and the first electrode and the second electrode to apply power supplied from the outside to the first electrode and the second electrode, thereby discharging the power. A surface light source device including a power supply relay member for relaying; A liquid crystal display panel which displays an image using light emitted from the surface light source device; A storage container accommodating the surface light source device and the liquid crystal display panel; And an inverter for applying a discharge voltage to the first and second electrodes.

According to such a surface light source device and a liquid crystal display device having the same, as a plurality of wire connections drawn out from the power applying means can be made with a single wire connection, workability can be improved and assembly time can be shortened.

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

Embodiments of the surface light source device

First embodiment

1 is a partial cutaway perspective view illustrating a surface light source device according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA ′ of FIG. 1, and FIG. 3 is a line B-B ′ of FIG. 1. It is a cross section which cut along.

1 to 3, the surface light source device 100 according to the first embodiment of the present invention includes a light source body 110, a space divider 130, and first and second electrodes 150a and 150b. ) And power intermediaries 170a and 170b.

The light source body 110 may include the first substrate 111, the second substrate 113 disposed to face the first substrate 111 at a predetermined interval, and the first substrate 111 and the second substrate 113. It includes a sealing member 115 disposed between to form a discharge space.

The first and second substrates 111 and 113 are glass substrates that transmit visible light and block ultraviolet rays.

The sealing member 115 seals between the outer edges of the first and second substrates 111 and 113 to form a discharge space. In this case, the sealing member 115 may be removed due to being integrally formed with the first substrate 111 or the second substrate 113.

The space dividing unit 130 is disposed in the discharge space of the light source body 110, and at least one or more spaces are disposed at equal intervals in parallel with each other in order to divide the discharge space into a plurality of discharge regions. Each of the space dividing units 130 has a rod shape extending in the first direction, and the upper and lower portions are in close contact with the first substrate 111 and the second substrate 113. In this case, each of the space dividing units 130 may be adhered to the first substrate 111 and the second substrate 113 by a coupling member such as an adhesive. Each of the space dividing units 130 is formed such that at least one end of both ends in the first direction is spaced apart from the inner surface of the sealing member 115 by a predetermined distance. This is to provide the connection passage 119 so that the discharge gas existing in the discharge space can be uniformly distributed in the plurality of discharge regions 117. The sealing member 115 may be formed of a different material from the space dividing unit 130, but may be formed of the same material when the space dividing unit 130 is formed.

The first and second electrode parts 150a and 105b are formed at both sides of the light source body 110 in a second direction perpendicular to the first direction, respectively. In the exemplary embodiment of the present invention, the first and second electrode portions 150a and 150b are formed only on the outer surfaces of the first substrate 111 and the second substrate 113, but the first substrate 111 or the second substrate is formed. It may be formed on only one side of 113, or may be formed to surround both sides. Discharge sustain voltages are applied to the first and second electrode parts 150a and 150b to maintain a discharge state in the discharge space. Here, the first and second electrode parts 150a and 105b may be made of a material having excellent conductivity, for example, copper (Cu), nickel (Ni), aluminum tape (Al tape), silver paste, or the like. Is formed.

The power relays 170a and 170b surround one side of the light source body 110 and the first and second electrode parts 150a and 105b and are formed to be in electrical contact with the first and second electrode parts 150a and 105b. do. The power relays 170a and 170b use a conductive metal material so as to be electrically connected to the first and second electrode parts 150a and 150b. The power intermediary unit 170a and 170b connects the first and second electrode units 150a and 150b to each other in the form of a clip, thereby providing power applied from a power supply unit such as an inverter (not shown). The first and second electrode portions 150a and 150b may be simultaneously applied. The power intermediary 170a and 170b may include a wire fixing protrusion 171 for fixing the wire 190 so that power is applied to the first and second electrode parts 150a and 150b from the power applying means through the wire 190. Include.

As shown in FIG. 2, the surface light source device 100 according to the first embodiment of the present invention may include first and second fluorescent layers formed on opposite surfaces of the first and second substrates 111 and 113, respectively. 210, 230, and a reflective layer 250 formed between the second substrate 113 and the second fluorescent layer 230. The first and second fluorescent layers 210 and 230 are formed in thin films on opposite surfaces of the first and second substrates 111 and 113 except for the region where the space dividing unit 130 is disposed. The first and second fluorescent layers 210 and 230 emit visible light by ultraviolet rays generated by plasma in the discharge space. The reflective layer 250 reflects the visible light generated by the first and second fluorescent layers 210 and 230 toward the first substrate 260.

In the surface light source device 100 according to the first embodiment of the present invention, a protective layer (not shown) is formed between the first substrate 210 and the first fluorescent layer 260 and between the second substrate 220 and the reflective layer, respectively. C) may be further included. The protective layer prevents chemical reaction between the first and second substrates 210 and 220 and mercury, which is a main component of the discharge gas injected into the discharge space.

FIG. 4 is a plan view illustrating an arrangement of a space divider in the surface light source device of FIG. 1.

Referring to FIG. 4, at least one or more space divider 130 is interposed between the first substrate 111 and the second substrate 113 to form the first substrate 111 and the second substrate 113. The discharge space formed in between is divided into a plurality of discharge regions 117. In the first embodiment of the present invention, the space divider 130 is formed on the second substrate 113, but the space divider 130 may be formed on the first substrate 111. It is not limited only to an Example.

Each space divider 130 has ends 131 and 133 facing the sealing member 115. The space division parts 130 are spaced apart from each other by a distance d, and the end parts 131 and 133 are arranged in a zigzag form while maintaining a constant distance from the opposing surface of the sealing member 115. Each space divider 130 is formed in a rod shape having a width W and a length L1, and the length L1 is shorter than the length L2 of the sealing member 115. As the space dividing unit 130 is arranged in a zigzag form, spaced spaces are formed, and such spaced spaces form a connection passage 119 for movement of discharge gas. Through the connection passage 119 of this structure, the discharge gas can be uniformly distributed to all the discharge region 117 in a short time. In the first embodiment of the present invention, the connecting portion 119 is formed by the space dividing portion 130 having a zigzag shape, but both ends 131 and 133 of the space dividing portion 130 are in contact with the sealing member 115. It may have a discharge area 117 sealed without the connection passage 119. In this case, a hole is formed in a part of the space dividing unit 130 to form a connection passage to uniformly distribute the discharge gas, so that the discharge gas is smoothly and uniformly distributed.

5 is a diagram illustrating the power intermediary of FIG. 1 in more detail.

As shown in FIG. 5, the power intermediary 170 according to the first embodiment of the present invention includes a wire fixing protrusion 171. The wire fixing protrusion 171 has a semicircular shape extending from the power intermediation portions 170a and 170b to protrude, and a hole 173 is formed in the center portion to allow the wire 190 to be inserted. The wire fixing protrusion 171 is the same metallic material as the power intermediation parts 170a and 170b so that power is applied, but may be any material that can be applied with power. The wire fixing protrusion 171 fixes the wire 190 so that power applied from the inverter is transferred to the first and second electrode parts 150a and 150b through the power intermediation units 170a and 170b. In this way, the power intermediary unit 170a, 170b conducts the first and second electrode portions 150a, 150b to each other in a clip type, thereby supplying power applied from the inverter through a single wire to the light source body 110. It may be applied simultaneously to the first electrode portion 150a formed on the outside. In addition, by inserting and soldering the wire 190 to the wire fixing protrusion 171, it is possible to simplify the conventional two wires into a single wire, thereby improving wire fixing workability, assembly and reliability. You can. In the first embodiment of the present invention, although the wire fixing protrusion 171 is formed on the power intermediary portions 170a and 170b formed on the outer side of the first substrate 111, the side or the lower portion of the power intermediary portions 170a and 170b. It can also be formed on either side of the.

Second embodiment

6 is a view showing a surface light source device according to a second embodiment of the present invention. In the second embodiment, the rest of the configuration except for the power relays 370a and 370b is the same as the surface light source device 100 shown in FIG. 1, and therefore the same names and reference numerals will be used for the same components. .

Referring to FIG. 6, the power intermediary parts 370a and 370b according to the second embodiment of the present invention include a first wire fixing protrusion 371 and a second wire fixing protrusion 373.

The first wire fixing protrusion 371 is cut out from the base of the power intermediary portions 370a and 370b and then protrudes a predetermined height in a predetermined direction to form a wing that can accommodate the electrode wire of the wire 190. When a predetermined force is applied to the wing, the wing comes in contact with the wire 190 surrounding the electrode line. In this case, the first wire fixing protrusion 371 is in contact with the electrode line of the wire 190 and fixes the electrode line, so that power applied from the inverter can be applied to the first and second electrode portions 150.

The second wire fixing protrusion 373 is cut out from the base of the power intermediary parts 370a and 370b and protrudes a predetermined height in a predetermined direction to form a wing to accommodate the outer shell of the wire 190. In this case, the second wire fixing protrusion 373 fixes the outer shell of the wire 190 so that the wire 190 is not easily pulled out by an external force applied from the outside. As such, the second embodiment of the present invention can simplify the conventional two wires into a single wire, thereby improving the wire fixing workability, assembling and reliability, and the external force applied from the outside. By doing so, the wire 190 does not fall easily.

Embodiment of liquid crystal display device

Third embodiment

7 is an exploded perspective view illustrating a liquid crystal display according to a third exemplary embodiment of the present invention.

Referring to FIG. 7, the liquid crystal display 1000 may include a surface light source device 100, a display unit 500, a storage container 600, and an inverter 500. Since the surface light source device 100 applied to the third embodiment of the present invention is the same as the surface light source device shown in FIG. 1, the description thereof will be omitted.

The display unit 500 includes a liquid crystal display panel 510 for displaying an image, data for providing a driving signal for driving the liquid crystal display panel 510, and gate printed circuit boards 530 and 550. The data and gate printed circuit boards 530 and 550 are electrically connected to the liquid crystal display panel 510 through a data tape carrier package (hereinafter referred to as TCP) 570 and a gate TCP 590.

The liquid crystal display panel 510 includes a thin film transistor (hereinafter, referred to as TFT) substrate 511, a color filter substrate 515 coupled to the TFT substrate 511, and the two substrates 513 and 515. And a liquid crystal 517 interposed therebetween.

The TFT substrate 511 is a transparent glass substrate on which a switching element TFT (not shown) is formed in a matrix form. Data and gate lines are respectively connected to the source and gate terminals of the TFTs, and a pixel electrode (not shown) made of a transparent conductive material is connected to the drain terminal. The color filter substrate 513 is a substrate in which RGB pixels (not shown) which are color pixels are formed by a thin film process. A common electrode (not shown) made of a transparent conductive material is formed on the color filter substrate 513.

The storage container 600 includes a bottom surface 610 and a plurality of sidewalls 630 formed to form a storage space at an edge portion of the bottom surface 610. The storage container 600 fixes the surface light source device 100 and the liquid crystal display panel 510 so as not to flow.

The bottom surface 610 has a floor area sufficient to accommodate the surface light source device 100, and preferably has the same shape as the surface light source device 100. In the third embodiment of the present invention, the bottom surface 610 has a square plate shape like the surface light source device 100. The side wall 630 extends vertically from the edge portion of the bottom surface 610 so that the surface light source device 100 does not escape to the outside.

The inverter 700 is disposed outside the storage container 600 and generates a discharge voltage for driving the surface light source device 100. The discharge voltage generated from the inverter 700 is applied to the power relays 170a and 170b through the wire 190. Since the power supply line is fixed to the wire fixing protrusion 171, the power intermediation unit 170a is applied to the surface light source device 100 through the first electrode unit 150a. That is, the first wire 190 is connected to the first electrode portion 170a of the surface light source device 100, and the second wire 190b is connected to the second electrode portion 150b. Accordingly, the discharge voltage is applied to the first and second electrode parts 150a and 150b via the power supply intermediary 170a and 170b, and the applied discharge voltage is applied to each discharge space of the surface light source device 100 to discharge it. Initiate. The wires 190a and 190b may be directly connected to the first and second electrode parts 150a and 150b through soldering.

The liquid crystal display 1000 according to the third exemplary embodiment of the present invention further includes a top chassis 800 and at least one optical member 900.

The top chassis 800 is coupled to the storage container 600 while surrounding the edge portion of the liquid crystal display panel 510. The top chassis 800 prevents the liquid crystal display panel 510 from being damaged by an external impact, and prevents the liquid crystal display panel 510 from being separated from the storage container 600. The optical member 900 performs a diffusion function for diffusing the light or a prism function for condensing the light in order to improve the brightness and the uniformity of the light emitted from the surface light source device 100.

As described above, according to the surface light source device of the present invention and the liquid crystal display device having the same, since the surface light source is emitted by light emission, the luminance becomes uniform, and a plurality of wire connections drawn from the power applying means can be performed by a single wire connection. As a result, workability can be improved and assembly time can be shortened.

In addition, according to the present invention, the surface light source device prevents the wire from being easily separated from the electrode by an external force applied from the outside.

In the detailed description of the present invention described above with reference to the preferred embodiments of the present invention, those skilled in the art or those skilled in the art having ordinary skill in the art will be described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

1 is a view showing a surface light source device according to a first embodiment of the present invention.

2 is a cross-sectional view taken along the line AA ′ of FIG. 1.

3 is a cross-sectional view taken along the line BB ′ of FIG. 1.

FIG. 4 is a plan view showing a space divider arrangement in the surface light source device of FIG. 1. FIG.

5 is a view showing in more detail the power intermediary of FIG.

6 is a view showing a surface light source device according to a second embodiment of the present invention.

7 illustrates a liquid crystal display according to a third exemplary embodiment of the present invention.

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

100: surface light source device 110: light source body portion

130: space division part 150a, 150b: electrode part

170a, 170b: power intermediary 190: wire

500: display unit 600: storage container

700: inverter 800: top chassis

900 diffusion member

Claims (13)

A light source body having at least one discharge region divided in a first direction; And Extends in a second direction intersecting the first direction and is formed on both outer surfaces of the light source body, and has a shape to which the conductive wires can be connected to receive power supplied from the outside to at least one of the outer surfaces; Surface light source device comprising an electrode portion. The method of claim 1, wherein the light source body portion A first substrate; A second substrate spaced apart from the first substrate by a predetermined distance; And At least one space dividing member arranged side by side with each other to divide the discharge region; And And a sealing member disposed between the first and second substrates to form the discharge space. The surface light source device of claim 1, wherein the surface light source device receives a discharge voltage from the inverter through the electrode unit. The method of claim 2, First and second fluorescent layers formed on opposite surfaces of the first and second substrates facing each other; And The surface light source device of claim 1, further comprising a reflective layer formed under the one of the first fluorescent layer and the second fluorescent layer to reflect visible light generated by the first and second fluorescent layers to a display area. The surface light source device of claim 1, wherein the electrode part has a shape protruding a predetermined height from a base, and a hole is formed in the electrode part for connection with the conductive wire drawn out from the outside. The method of claim 1, wherein the electrode unit, A first fixing protrusion having a wing shape which is cut out from a base and protrudes a predetermined height and fixes an outer shell surrounding the conductive wire; And And a second fixing protrusion configured to fix and connect the conductive line by forming a second wing which is cut from the base and protrudes a predetermined height. A light source body in which a plurality of discharge regions are formed in a first direction so that discharge can be performed by the discharge gas; First and second electrodes extending in a second direction crossing the first direction and formed on both sides of the light source body; And A projection surface is formed on at least one surface, the surface light source device including a power supply intermediary member for applying the power supplied from the outside to the first and second electrodes to mediate the power so that the discharge can occur. The method of claim 7, wherein the projection is projected a predetermined height from the base surface of the power intermediary member, characterized in that the hole is formed for the connection of the wire so that the power applied to the projection is applied to the first and second electrodes Surface light source device. The method of claim 7, wherein the projection is, A first fixing protrusion which is cut out from the base surface of the power intermediary member and has a wing shape protruding a predetermined height to fix the sheath surrounding the wire; And And a second fixing protrusion which has a wing shape cut out from the base surface and protrudes a predetermined height and connects the wire to the first and second electrodes. A light source body in which a plurality of discharge regions are formed in a first direction so that discharge can be performed by a discharge gas, first and second electrodes respectively formed on outer surfaces of both sides of the light source body, and the first and second electrodes A surface light source device including a power intermediation member formed on at least one surface of a second electrode to apply power supplied from the outside to the first electrode and the second electrode to mediate the power so that discharge may occur; A liquid crystal display panel which displays an image using light emitted from the surface light source device; A storage container accommodating the surface light source device and the liquid crystal display panel; And And an inverter for applying a discharge voltage to the first and second electrodes. The method of claim 10, wherein the light source body A first substrate; A second substrate spaced apart from the first substrate by a predetermined distance; At least one space dividing member arranged side by side with each other to divide the discharge region; And A sealing member disposed between the first and second substrates to form the discharge space, And the first and second electrodes are formed on an outer surface of the second substrate. The method of claim 10, wherein the protrusion has a shape protruding a predetermined height from the base surface of the power intermediary member, the protrusion is formed in the hole for the connection of the wire so that the power applied to the first and second electrodes A liquid crystal display device. The method of claim 10, wherein the protrusions, A first fixing protrusion which is cut out from the base surface of the power intermediary member and has a wing shape protruding a predetermined height to fix the wire; And And a second fixing protrusion having a wing shape cut out from the base surface and protruding a predetermined height, and connecting the wire to the first and second electrodes.