KR20080099974A

KR20080099974A - Guide for lamp fixation, back light and liquid crystal display device using the same

Info

Publication number: KR20080099974A
Application number: KR1020070045943A
Authority: KR
Inventors: 이상래; 진민지
Original assignee: 엘지디스플레이 주식회사
Priority date: 2007-05-11
Filing date: 2007-05-11
Publication date: 2008-11-14

Abstract

A guide for fixing a lamp, and a backlight unit using the same are provided to fix a lamp for preventing light leakage and a failure due to a dark spot. Loop parts(14a,14b) have a tweezer shape loop for fixing a lamp, and a loop supporting member for fixing loop parts using a loop pin. A guide(18) for fixing lamp comprises holder units(16a,16b,16c) for fixing support cover and a plurality of holders for fixing the support cover to the back plane. The loop unit is assembled with the loop, the pin, and the loop support unit, or is an integrated body.

Description

GUIDE FOR LAMP FIXATION, BACK LIGHT AND LIQUID CRYSTAL DISPLAY DEVICE USING THE SAME}

Figure 1a is a perspective view showing a lamp fixing guide according to an embodiment of the present invention.

1B and 1C are exploded perspective views of the lamp fixing guide shown in FIG. 1A.

2 is an exploded perspective view schematically illustrating a backlight unit and a liquid crystal display using the same according to an exemplary embodiment of the present invention.

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

Figure 4a and 4b is an exploded perspective view showing a lamp fixing guide according to another embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view of a liquid crystal display with a lamp fixing guide shown in FIGS. 4A and 4B.

6A and 6B are exploded perspective views illustrating a lamp fixing guide according to another embodiment of the present invention.

* Brief description of symbols for the main parts of the drawings.

2: backlight unit 12: reflector

14 ring portion 16 holder portion

18: Lamp fixing guide 22: First socket

32: second socket 100: liquid crystal panel

204a: ring 204b: ring pin

204c: ring support 206a: support cover

206b: Holder 206c: Cover Groove

The present invention relates to a lamp fixing guide for fixing a lamp so that a defect due to light leakage and dark spots does not occur, and a backlight unit and a liquid crystal display using the same.

As the information society develops, the demand for image display devices for displaying images is increasing in various forms. Recently, liquid crystal display (LCD), plasma display panel (PDP), electro luminescent display (ELD), and VFD ( Various flat panel displays such as Vacuum Fluorescent Display have been utilized.

Among such flat panel displays, liquid crystal displays are widely used due to their low power drive and excellent image quality. As the liquid crystal display, a liquid crystal panel including two substrates facing each other and liquid crystal interposed between the two substrates is used. Here, the liquid crystal panel displays an image by changing the liquid crystal array by the electric field generated between the two substrates. However, since the liquid crystal panel corresponds to a non-emission type display panel, light is supplied from a backlight unit to display an image.

In general, the backlight unit is divided into an edge type backlight unit and a direct type backlight unit according to the position of the lamp. Here, the conventional direct type backlight unit includes a plurality of lamps and generates light by supplying a high voltage supplied from an inverter to each lamp.

However, the conventional direct type backlight unit has a problem in that dark spots and light leakage occur at lamp fixing portions to prevent vibration and sag of each lamp. Specifically, the thickness of the backlight unit is getting thinner according to the recent trend of miniaturization and slimming of the liquid crystal display. At this time, the light reflection is uneven and dark spots are generated by the opaque fixing guide or fixing pins for fixing the lamps. If a fixing pin or a fixing guide for fixing the lamps is formed of a transparent material, light leakage may occur in the penetrated and fixed portions because the fixing pin or fixing guide is fixed to penetrate through the rear surface of the backlight unit. Such light leakage becomes a problem of generating dark spots on the front surface.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object thereof is to provide a lamp fixing guide, a backlight unit and a liquid crystal display using the same, which can fix a lamp so that a defect due to light leakage and dark spots does not occur. .

Fixing guide according to an embodiment of the present invention for achieving the above object is formed in the shape of tongs ring support for fixing the respective loops through at least one ring for fixing the lamp and the ring pin connected to each ring Ring portion including; And a holder part including a support cover for covering and fixing the ring support part and a plurality of holders for fixing the support cover to a cover on a rear surface thereof.

The holder portion has at least one cover groove formed to penetrate each of the rings and the ring pins when the holder portion is coupled to the hook portion, and at least one protrusion formed between the cover grooves in the direction in which the rings and the ring pins penetrate. It is characterized by further comprising. The plurality of holders further include first holders each formed in a shape facing each other on both side surfaces in the unidirectional direction of the support cover, and second holders respectively formed in a shape facing each other on both side surfaces of the support cover. Characterized in that provided. Here, the ring portion is formed of a transparent material, the holder portion is characterized in that formed by a reflective material or formed by applying a reflective material.

In addition, a backlight unit according to an embodiment of the present invention for achieving the above object includes a plurality of lamps having first and second electrodes; A cover for housing the plurality of lamps; And it is mounted to the cover characterized in that it comprises a lamp fixing guide as described above to fix the plurality of lamps.

In addition, a liquid crystal display device according to an embodiment of the present invention for achieving the above object is a liquid crystal panel for displaying an image by adjusting the transmittance of light; And a backlight unit as described above for irradiating light to the liquid crystal panel.

Hereinafter, a lamp fixing guide and a backlight unit and a liquid crystal display using the same according to an embodiment of the present invention having the above characteristics will be described in detail with reference to the accompanying drawings.

1A is a perspective view illustrating a lamp fixing guide according to an embodiment of the present invention, and FIGS. 1B and 1C are exploded perspective views of the lamp fixing guide shown in FIG. 1A.

As shown in Figure 1a to 1c, the lamp fixing guide 18 according to an embodiment of the present invention is a holder portion for fixing the hook portion 14 and the hook portion 14 for fixing by mounting the lamp (16) is provided.

The ring portion 14, as shown in Figure 1b, the groove is formed so as to mount the lamp ring 14a having a tong shape, ring pin 14b and ring pin 14b for adjusting the height of the ring 14a ) Is provided with a ring support 14c for fixing the ring. Here, the ring portion 14 may be formed by assembling the ring 14a, the ring pin 14b and the ring support 14c, and the ring 14a, the ring pin 14b and the ring support 14c are integrally formed. It may be formed as. In addition, the ring portion 14 is formed of a transparent material may allow light from the lamp to pass through.

As shown in FIG. 1C, the holder 16 includes a support cover 16a for covering and fixing the ring support 16c and a holder 16b for fixing the support cover 16a to the floor. Here, the cover groove 16c is formed in the support cover 16a of the holder portion 16 so that the ring 14a and the ring pin 14b penetrate. Therefore, the ring 14a and the ring pin 14b pass through the cover groove 16c and protrude through the cover groove 16c when the ring portion 14 and the holder portion 16 are coupled as shown in FIG. 1A, and the support cover 16a and the holder are supported. The ring support 14c is fixed by 16b. Here, the holder part 16 may be formed of a reflective material or coated with a reflective material to reflect light from the lamp 40.

FIG. 2 is an exploded perspective view schematically illustrating a backlight unit and a liquid crystal display using the same according to an exemplary embodiment of the present invention, and FIG. 3 is a cross-sectional view taken along the line II ′ of FIG. 2.

2 and 3, a backlight unit and a liquid crystal display using the same according to an exemplary embodiment of the present invention may include a backlight unit 2; Panel guide 90; The liquid crystal panel 100 and the case 130 are provided.

The backlight unit 2 mounts a plurality of lamps 40 having the first and second electrodes 42 and 44, a cover 10 for storing the plurality of lamps 40, and a plurality of lamps 40. A plurality of lamp fixing guides 18 mounted on the cover 10 are provided for fixing.

In addition, the backlight unit 2 includes a first socket portion 20 having a plurality of first sockets 22 connected to the first electrode 42 of each lamp 40, and a second of each lamp 40. A second socket portion 30 having a plurality of second sockets 32 connected to the electrode 44, disposed on one side of the cover 10, and having a first socket portion 20 and one side edge of each lamp 40. A first side frame 50 surrounding the second frame 50, a second side frame 60 disposed on the other side of the cover 10, and a second side frame 60 surrounding the other edges of the lamps 40 and the plurality of lamps 40. Further, it further comprises a diffuser plate 70 disposed on the front surface of the cover 10 and at least one optical sheet 80 disposed on the diffuser plate 70 so as to face ().

Each lamp 40 is detachably mounted between each socket 22 and 32 to face the liquid crystal panel 100. Here, each lamp 40 may be a cold cathode fluorescent lamp (CCFL). Each of the plurality of lamps 40 is turned on by lamp driving voltages supplied from the sockets 22 and 32 to irradiate light to the liquid crystal panel 100.

The cover 10 extends from the inclined surface to face the bottom surface facing the plurality of lamps 40, the inclined surface inclined at a constant inclination from the top and bottom of the bottom surface to correspond to the longitudinal direction of the lamp 40, and the inclined surface to face the bottom surface. It is manufactured to include a seating portion. In addition, a reflective sheet 12 is attached to the bottom surface and the inclined surface of the cover 10 to reflect the light from each lamp 40 toward the liquid crystal panel 100. Here, the reflective sheet 12 may not be attached to portions of both bottom edges of the bottom surface of the cover 10, that is, portions corresponding to the sizes of the first and second socket portions 20 and 30.

The lamp fixing guide 18 is mounted on the bottom surface of the cover 10 so as to correspond to each lamp 40. Specifically, each lamp fixing guide 18 is mounted on the bottom surface of the cover 10 between the first and second socket portions 20 and 30, respectively, and provided to correspond to at least one lamp 40. do.

This, the lamp fixing guide 18 has the same configuration as the lamp fixing guide 18 according to the embodiment of the present invention shown in Figures 1a to 1c. In other words, as shown in FIGS. 1A and 3, the holder 16b of the holder portion 16 penetrates the bottom surface of the cover 10 with the ring portion 14 and the holder portion 16 coupled thereto. The lamp fixing guide 18 is fixed to the cover 10. Accordingly, each lamp 40 is fitted to the first and second sockets 22 and 32 while being fixed to the hook 14a of each lamp fixing guide 18. Here, a plurality of grooves 7 are formed in the bottom surface of the cover 10 of the backlight unit 2 such that each holder 16b is inserted to fix the holder 16. At this time, each ring portion 14 and the holder portion 16 is formed of a different material to prevent the dark spot and the light leakage occurs. In other words, each ring 14 is formed of a transparent material to prevent the dark spots generated by the fixing portion of the lamp 40, the holder 16 is formed of a reflective material is formed by a plurality of grooves (7) Can prevent light leakage.

The first socket part 20 supplies the first electrode 42 with the driving voltage from the common line (not shown) of the first substrate and the first substrate to which the driving voltage for driving each lamp 40 is supplied. A plurality of first sockets 22 are provided. Here, the first socket 22 is a body disposed on the first substrate to support one edge of the lamp 40, a clip and a balance disposed on the body to be electrically connected to the first electrode 42 of the lamp 40 An element and the like.

The second socket part 30 supplies the driving voltage from the common line (not shown) of the second substrate and the second substrate to which the driving voltage for driving each lamp 40 is supplied to the second electrode 44. A plurality of second sockets 32 are provided. Here, the second socket 32 is a body disposed on the second substrate to support the other edge of the lamp 40, a clip and a balance disposed on the body to be electrically connected to the second electrode 44 of the lamp 40 An element and the like.

The first side frame 50 is installed at one edge of the cover 10 to surround one edge of the lamp 40 mounted to the first socket part 20. To this end, the first side frame 50 includes an inclined surface that reflects light emitted from the lamp 40 and a lamp hole formed in the inclined surface and penetrated by the lamp 40. The first side frame 50 is installed at one edge of the cover 10 by a screw.

The second side frame 60 is installed at the other edge of the cover 10 and surrounds the other edge of the lamp 40 mounted to the second socket part 30. To this end, the second side frame 60 is configured to include an inclined surface for reflecting light emitted from the lamp 40 and a lamp hole formed in the inclined surface and penetrated by the lamp 40. The second side frame 60 is installed at the other edge of the cover 10 by a screw.

The cover 10 has a rectangular frame shape by installing the first and second side frames 60.

The diffusion plate 70 is provided with first and second side frames 50 and 60 and stacked on the front opening of the cover 10 having a rectangular frame shape. That is, the diffusion plate 70 is laminated on the seating portion 8 of the cover 10 and the upper surfaces of the first and second side frames 50 and 60. In this case, a plurality of protrusions (not shown) may be installed at the central portion of the cover 10 to prevent sagging of the diffusion plate 70. The diffusion plate 70 diffuses the light emitted from the plurality of lamps 40 to the entire area of the liquid crystal panel 100.

The plurality of optical sheets 80 allows light diffused by the diffusion plate 70 to be irradiated perpendicular to the liquid crystal panel 100. To this end, the plurality of optical sheets 80 may be at least one prism sheet for collecting light diffused by the diffusion plate 70.

Here, although not shown in the drawing, the backlight unit 2 includes a plurality of inverters for generating lamp driving voltages, a plurality of wires for supplying lamp driving voltages from the respective inverters to the respective socket units 20 and 30. It is further provided.

The backlight unit 2 lights the plurality of lamps 40 by using the lamp driving voltages supplied from the inverter to the first and second socket parts 20 and 30, respectively, to generate light to generate light. Check).

On the other hand, the panel guide 90 is mounted on the seating portion 8 of the cover 10 to wrap the edge and side surfaces of the diffusion plate 70 and the plurality of optical sheets 80 and to surround the side surface of the cover 10. do. The panel guide 90 includes a panel support 9 for supporting the liquid crystal panel 100. 3, the panel support part 9 is formed to be stepped to support the rear non-display area and the side surface of the liquid crystal panel 100.

The liquid crystal panel 100 is stacked on the panel support of the panel guide 90 to adjust the transmittance of light from the backlight unit 2 to display an image.

To this end, the liquid crystal panel 100 is a liquid crystal (not shown) formed between the lower substrate 102 and the upper substrate 104, the lower substrate 102 and the upper substrate 104, the lower substrate 102 and the upper substrate ( And a spacer (not shown) for maintaining a constant gap therebetween.

The upper substrate 104 includes a color filter, a black matrix, a common electrode, and the like.

The lower substrate 102 includes a thin film transistor formed in each cell region defined by data lines and gate lines and a pixel electrode connected to the thin film transistor. The thin film transistor switches the image signal supplied from the data line to the pixel electrode in response to the gate-on voltage supplied from the gate line. Here, the common electrode formed on the upper substrate 104 may be formed on the lower substrate 102 according to the liquid crystal mode.

In addition, a non-display area of the lower substrate 102 is provided with a data pad area connected to each of the data lines and a gate pad area connected to each of the gate lines.

A plurality of data circuit films 110 mounted with data integrated circuits 112 for supplying image signals to data lines are attached to the data pad region. Each data circuit film 110 may be a tape carrier package or a chip on film. Each of the data circuit films 110 supplies a data signal from a data printed circuit board (not shown) to the data integrated circuit 112, and supplies an image signal output from the data integrated circuit 112 to each data line. do. The data integrated circuit 112 may be mounted on the lower substrate 102 by a chip on glass method.

A plurality of gate circuit films 120 on which the gate integrated circuit 122 is mounted to supply gate-on voltages to the gate lines are attached to the gate pad region. Each gate circuit film 120 may be a tape carrier package or a chip on film. Each of the gate circuit films 120 supplies a gate control signal supplied from the data printed circuit board to the gate integrated circuit 122 through the data circuit film 110 and the lower substrate 102, and the gate integrated circuit 122. The gate-on voltage outputted from the N / A) is supplied to each gate line. Here, the gate integrated circuit 122 may be mounted on the lower substrate 102 by a chip on glass method, or may be formed on the lower substrate 102 together with the manufacturing process of the thin film transistor.

The case 130 is bent to surround the front non-display area of the liquid crystal panel 100 and the side surface of the cover 10. In this case, the case 130 is fastened and fixed to the panel guide 90 surrounding the side of the cover 10.

4A and 4B are exploded perspective views illustrating a lamp fixing guide according to another embodiment of the present invention. 5 is a cross-sectional view schematically illustrating a liquid crystal display device having a lamp fixing guide illustrated in FIGS. 4A and 4B.

Lamp fixing guide 200 according to another embodiment of the present invention has a ring portion 204 for fixing by mounting a plurality of lamps 40 and a holder portion 206 for fixing the ring portion 204 do. Here, since the other components except for the structure of the ring portion 204 and the holder portion 206 is the same as the components shown in Figure 3 for the components of Figure 5 using the same reference numerals as in Figure 3 The description will be replaced with the above description.

The ring portion 204 has grooves formed to mount each lamp so that a plurality of hooks 204a having a tong shape, a plurality of ring pins 204b for adjusting the height of each ring 204a, and a plurality of A ring support 204c is provided for fixing the plurality of rings 204a by supporting the ring pins 204b. Here, the ring portion 204 may be formed by assembling the ring 204a, the ring pin 204b, and the ring support 204c, and the ring 204a, the ring pin 204b, and the ring support 204c are integrally formed. It may be formed as. In addition, the ring portion 204 is formed of a transparent material may allow light from the lamp to pass through.

The holder portion 206 includes a support cover 206a for covering and fixing the ring support 204c, a holder 206b for fixing the support cover 206a to the floor, a plurality of rings 204a, and a plurality of ring pins. A plurality of cover grooves 206c are formed to penetrate 204b. In addition, at least one protrusion 206d is provided between the cover grooves 206c of the holder portion 206 to prevent the diffusion plate 70 from sagging. Therefore, when the ring portion 204 and the holder portion 206 are coupled, the ring 204a and the ring pin 204b pass through and protrude through the cover groove 206c, and the support cover 206a and the holder 206b. The ring support 204c is fixed by this. Here, the holder 206 may be formed of a reflective material or coated with a reflective material to reflect light from the lamp 40.

In detail, a plurality of lamp fixing guides 200 may be mounted on the bottom surface of the cover 10 to correspond to the plurality of lamps 40. For example, the lamp fixing guide 200 may be mounted on the bottom surface of the cover 10 so as to correspond to the three lamps 40 as shown in FIG. 5. That is, the holder 206b of the holder 206 is penetrated through the bottom surface of the cover 10 in a state in which the ring portion 204 and the holder portion 206 are coupled to the cover 10. Accordingly, each lamp 40 is fixed by being mounted on the ring 204a of each lamp fixing guide 200. The diffusion plate 70 is prevented from sagging by the plurality of protrusions 206d provided in the holder portion 206. Here, a plurality of grooves 7 are formed in the bottom surface of the cover 10 of the backlight unit 2 such that each holder 6b is inserted to fix the holder 206 as shown in FIG. 5.

6A and 6B, a lamp fixing guide according to another embodiment of the present invention may be provided with a hook portion 304 for fixing the plurality of lamps 40 and a holder portion 306 for fixing the hook portion 304. It is provided. Here, the lamp fixing guide according to another embodiment of the present invention is a configuration except for at least one of the first and second holders (206b, 306e) for fixing the support cover 206a to the floor is 4a and 4b It is the same as the lamp fixing guide 2 shown in FIG.

Specifically, the holder portion 306 shown in FIG. 6B includes a support cover 206a for covering and fixing the ring support 204c and at least one first and second for fixing the support cover 206a to the floor. A plurality of cover grooves 206c are formed to penetrate the holders 206b and 306e and the plurality of rings 204a and the plurality of ring pins 204b. A plurality of projections 206d are provided between the cover grooves 206c of the holder portion 206 to prevent the diffusion plate 70 from sagging.

Therefore, when the ring portion 204 and the holder portion 206 are coupled, the ring 204a and the ring pin 204b pass through and protrude through the cover groove 206c, and the support cover 206a and the first and first The ring support 204c is fixed by the two holders 206b and 306e, respectively.

As shown in FIG. 6B, the first and second holders 206b and 306e have four sides of the support cover 206a in a direction opposite to the lower end of each side surface of the support cover 206a, that is, the direction in which the protrusion 206d is formed. It may be formed on the side. Here, the first holders 206b may be formed on the first side of the support cover 206a to face each other. The second holders 306e may be formed to face each other on the second side surface of the support cover 306a. Here, the first side surface represents both side surfaces in the unidirectional direction of the support cover 206a and the second side surface represents both side surfaces in the longitudinal direction of the support cover 206a.

Accordingly, the first holders 206b and the second holders 306e may be arranged in a direction perpendicular to each other. Such first and second holders 206b and 306e may be integrally formed with the support cover 206a.

The first and second holders 206b and 306e are mounted to penetrate in the rear direction of the bottom cover 10 of the cover 10 of the backlight unit 2. At this time, the lamp fixing guide may be mounted on the bottom surface of the cover 10 so as to correspond to the three lamps 40, respectively. That is, the first and second holders 206b and 306e of the holder 306 penetrate the bottom surface of the cover 10 while the ring portion 304 and the holder portion 306 are coupled to each other. Is fixed to. Accordingly, each lamp 40 is fixed by being mounted on the ring 204a of each lamp fixing guide. The diffusion plate 70 is prevented from sagging by the plurality of protrusions 206d provided in the holder portion 206. Here, a plurality of grooves are formed in the bottom surface of the cover 10 of the backlight unit 2 so that the first and second holders 206b and 306e may be fitted to fix the holder 306.

As described above, the lamp fixing guide according to an embodiment of the present invention is fixed to at least one lamp by combining the ring portion made of a transparent material and the holder portion made of a reflective material. Therefore, it is possible to prevent the generation of dark spots along the lamp fixing portion by each ring portion of the transparent material, and to prevent light leakage in the back direction by the holder portion of the reflective material.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

The lamp fixing guide, the backlight unit and the liquid crystal display using the same according to an embodiment of the present invention may fix the lamp so that a defect due to light leakage and dark spots does not occur.

In other words, the lamp fixing guide according to the present invention is coupled to the ring portion made of a transparent material and the holder portion made of a reflective material, respectively, to fix at least one lamp. Accordingly, it is possible to prevent the generation of dark spots along the lamp fixing portion by each ring portion of the transparent material, and to prevent light leakage in the back direction by the holder portion of the reflective material.

Claims

A ring portion including at least one ring formed in a tong shape to fix the lamp and a ring support for fixing the respective rings through ring pins connected to the respective rings; And

And a holder part including a support cover for covering and fixing the ring support part and a plurality of holders for fixing the support cover to a rear surface thereof.

The method of claim 1,

The ring portion

Each of the hooks and the ring pin and the ring support is formed by assembling or the lamp fixing guide, characterized in that each ring and the ring pin and the ring support is formed integrally.

The method of claim 2,

The holder part

At least one cover groove formed to penetrate each of the rings and the ring pin upon engagement with the hook portion; and

The lamp fixing guide further comprises at least one protrusion formed between the cover grooves in the direction in which the hook and the hook pin pass.

The method of claim 3, wherein

The plurality of holders

First holders each formed in a shape facing each other on both side surfaces of the support cover in one direction; and

The lamp fixing guide further comprises a second holder each formed in a shape facing each other on both sides in the longitudinal direction of the support cover.

The method of claim 4, wherein

The ring portion is formed of a transparent material, the holder is a lamp fixing guide, characterized in that formed of a reflective material or formed by applying a reflective material.

A plurality of lamps having first and second electrodes;

A cover for housing the plurality of lamps; And

And a lamp fixing guide according to any one of claims 1 to 5 mounted on the cover to fix the plurality of lamps.

The method of claim 6,

A first socket portion having a plurality of first sockets connected to the first electrode,

A second socket portion having a plurality of second sockets connected to the second electrode,

A first side frame disposed at one side of the cover and surrounding one side edge of the first socket part and each lamp,

A second side frame disposed on the other side of the cover and surrounding the second socket portion and the other edge of each lamp,

A diffuser plate disposed in front of the cover to face each lamp, and

And at least one optical sheet disposed on the diffusion plate.

A liquid crystal panel which displays an image by adjusting light transmittance;

A backlight unit according to any one of claims 6 and 7, for irradiating light to the liquid crystal panel.

The method of claim 8,

A panel guide mounted to a seating portion of the cover to surround edges and sides of the diffusion plate and the plurality of optical sheets and to surround the side of the cover; and

And a case bent to surround the front non-display area of the liquid crystal panel and the side surface of the cover and fastened to the panel guide.