KR101245954B1 - Backlight unit and liquid crystal display device using the same - Google Patents

Abstract

The present invention relates to a backlight unit having a lamp guide capable of varying a position of a holder according to an arrangement interval of lamps, and a liquid crystal display device using the same.

The backlight unit according to the first embodiment of the present invention includes a plurality of lamps; A bottom cover having an upper side opened and the lamps disposed in an inner space; An optical member disposed above the lamps; And a plurality of holder parts configured to include a fastening part fastened to the bottom cover, a holder holding the lamps, and a first slider to which the holder is connected to support each of the lamps at a predetermined height in the bottom cover, and the optical member. And a lamp guide having at least one support part supporting a bottom portion and a guide rail to which the first slider of the holder part is movably inserted, wherein the guide rail is one side of the bottom cover in a direction crossing the lamps. Long from the other side.

Description

BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE USING THE SAME}

1 is a cross-sectional view schematically showing a conventional backlight unit in which a lamp guide is used.

2 is a perspective view of a conventional lamp guide equipped with a lamp.

3 is a diagram illustrating a liquid crystal display using the backlight unit according to the first embodiment of the present invention.

4 is a perspective view showing a fixing method of the lamp guide shown in FIG.

5 is a cross-sectional view showing the lamp guide shown in FIG.

6 is a perspective view showing another fixing method of the lamp guide shown in FIG.

FIG. 7 is a cross-sectional view illustrating the lamp guide shown in FIG. 6. FIG.

8 is a view showing another example of the holder portion shown in FIG. 3;

9 is a view showing a lamp guide of a backlight unit according to a second embodiment of the present invention.

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

2, 52: bottom cover 3, 53, 57: hole

4, 54: reflector 6, 56, 96: lamp guide

8, 58: lamp 10, 60: diffuser plate

12, 62: optical sheet 59: screw

63, 97: groove 65: protrusion

70 liquid crystal display panel 71 backlight unit

81, 91: holder 82, 92: holder support

83: first slider 84: support

85: second slider 93: projection

The present invention relates to a backlight unit and a liquid crystal display device using the same, and more particularly, to a backlight unit having a lamp guide capable of varying the position of the holder part according to an arrangement interval of lamps and a liquid crystal display device using the same.

In general, the liquid crystal display device has a trend that the application range is gradually widened due to the characteristics such as light weight, thin, low power consumption. In accordance with this trend, liquid crystal displays have been used in office automation equipment, audio / video equipment, and the like. In such a liquid crystal display, a transmission amount of a light beam is adjusted according to signals applied to a plurality of control switches arranged in a matrix to display a desired image on a screen.

Since the liquid crystal display is not a self-luminous display, a separate light source such as a backlight is required.

The backlight unit includes a direct type and an edge type according to the position of the light source. In the edge type method, a light source is installed at the edge of the liquid crystal display device, and the light incident from the light source is diffused to be incident on the entire surface of the liquid crystal display panel through the light guide plate and the plurality of optical sheets, and the light is collected by the liquid crystal display panel. To be possible. In the direct type, a plurality of light sources are disposed below the liquid crystal display panel, and the light incident from the light sources is directly dimmed to the entire surface of the liquid crystal display panel through the diffusion plate and the plurality of optical sheets. Allow it to collect.

Recently, the direct type backlight having higher luminance, light uniformity and color purity than the edge type has been used more mainly in LCD TVs.

The types of lamps used in the direct type backlight unit include a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), and a light emitting diode (LED). "LED").

Among these, the cold cathode fluorescent lamp and the external electrode fluorescent lamp have a larger length in proportion to the screen size as the liquid crystal display becomes larger. However, since the cold cathode fluorescent lamp and the external electrode fluorescent lamp are manufactured in a cylindrical shape with a very small diameter, sagging due to their own weight occurs as the length increases.

In addition, according to the large screen of the liquid crystal display device, a diffuser plate disposed on the lamp so that the light radiated from the lamp can be evenly spread on the entire liquid crystal display panel, and the light emitted from the diffuser plate is focused on the liquid crystal display panel. Since the area of the optical sheets that play a role also increases, sagging such as a lamp occurs.

The backlight unit emits light having non-uniform brightness distribution and optical characteristics to the liquid crystal display panel by partially sagging lamps, diffusion plates, and optical sheets, and thus, display quality deteriorates. .

In order to solve this problem, the conventional backlight unit arranges a lamp guide as shown in FIGS. 1 and 2 at a portion where sag occurs.

1 is a cross-sectional view schematically illustrating a conventional backlight unit in which a lamp guide is used, and FIG. 2 is a perspective view of a lamp guide in which a lamp is mounted.

1 and 2, a conventional backlight unit includes a bottom cover 2, a reflector 4, a lamp guide 6, a plurality of lamps 8, a diffuser plate 10, and a plurality of optical sheets. And an optical member composed of (12).

The bottom cover 2 is made of a container structure in which a plurality of lamps 8 are accommodated in an inner space, and a reflecting plate 4 is formed on the inner space.

As described above, the lamps 8 are formed of a cylindrical lamp such as a cold cathode fluorescent lamp or an external electrode fluorescent lamp to generate light, and the light generated from the lamps 8 is all diffused by the reflecting plate 4. Irradiated toward the plate 10.

The diffuser plate 10 includes a plurality of beads, which scatter light using the beads.

The optical sheets 12 include one or more diffusion sheets and one or more prism sheets to uniformly irradiate the light incident from the diffusion plate 10 to the entire liquid crystal display panel, and to provide light in a direction perpendicular to the display surface. It breaks the progress path and concentrates the light to the front of the display surface.

The lamp guide 6 is formed to fix two or more lamps, and includes a holder part 6a, a first support part 6b, a second support part 6c, and a fastening part 6d.

The holder part 6a is formed in the shape of wrapping the round part of the lamp 8, and has an opening so that a lamp can be inserted.

At least one first support part 6b is formed in the lamp guide 6, and is manufactured in a conical shape to minimize the area of the lamp guide 6.

The second support part 6c is formed in the shape of a pedestal so that the lamp guide 6 can be supported on the inner space surface of the bottom cover 2 on which the reflector plate 4 is formed. The holder part 6a and the 1st support part 6b are formed on this 2nd support part 6c, respectively. Since two or more holder portions 6a are formed so as to fix different lamps 8, the second support portion 6c is formed long in the longitudinal direction and the vertical direction of the lamp 8.

The fastening part 6d is inserted into the hole 3 penetrating the bottom cover 2 and the reflecting plate 4 so that the lamp guide 6 may be fastened to the bottom cover 2 and the reflecting plate 4. The fastening part illustrated in the drawing has a hook shape, and the bottom cover 2 and the reflector 4 further include fixing grooves 3a to allow the hooks to be fixed.

Such a conventional backlight unit can solve the deflection phenomenon of the lamp 8 and the deflection phenomenon of the optical member such as the diffusion plate 10 and the optical sheets 12 by using the lamp guide 6.

However, since the holder portion 6a of the lamp guide 6 is fixed to the second support portion 6c as shown in the figure, when adjusting the arrangement interval of the lamp 8, the lamp guide 6 and the lamp There is a problem that the mold of the bottom cover 2 on which the guide 6 is mounted needs to be manufactured again so as to match the arrangement interval of the lamp 8.

Accordingly, an object of the present invention is to provide a backlight unit having a lamp guide capable of varying the position of a holder according to an arrangement interval of lamps and a liquid crystal display device using the same.

In order to achieve the above object, the backlight unit according to the first embodiment of the present invention comprises a plurality of lamps; A bottom cover having an upper side opened and the lamps disposed in an inner space; An optical member disposed above the lamps; And a plurality of holder parts configured to include a fastening part fastened to the bottom cover, a holder holding the lamps, and a first slider to which the holder is connected to support each of the lamps at a predetermined height in the bottom cover, and the optical member. And a lamp guide having at least one support part supporting a bottom portion and a guide rail to which the first slider of the holder part is movably inserted, wherein the guide rail is one side of the bottom cover in a direction crossing the lamps. Long from the other side.

The guide rail includes a plurality of holes formed at predetermined intervals on the side surfaces.

The first slider is fixed to the guide rail by a first screw passing through the hole of the guide rail.

The support part includes a support for supporting the optical member from below and a second slider connected to the support.

The second slider is movably inserted into the guide rail.

The second slider is fixed to the guide rail by a second screw passing through the hole of the guide rail.

The support portion is formed on a holder of the holder portion.

A plurality of grooves are formed on the inner surface of the guide rail at predetermined intervals.

The first slider has a first protrusion protruding upward.

The first protrusion is inserted into the groove of the guide rail.

The support part includes a support for supporting the optical member from below and a second slider connected to the support.

The second slider has a second protrusion protruding upward.

The second protrusion is inserted into the groove of the guide rail.

The support portion is formed on a holder of the holder portion.

The optical member may include a diffuser plate that shields an opening of the bottom cover and diffuses light from the lamps; And at least one prism sheet disposed on the diffuser plate for converting a path of light incident from the diffuser plate, and at least one diffuser sheet for diffusing light incident from the diffuser plate. Equipped.

The backlight unit according to the first embodiment of the present invention further includes a reflecting plate attached to a bottom surface and a side surface in an inner space of the bottom cover.

The support is characterized in that the narrower toward the top.

The fastening part includes a clamp member, and the bottom cover and the reflector include a hole into which the clamp member can be inserted.

The backlight unit according to the second embodiment of the present invention includes a plurality of lamps; A bottom cover having an upper side opened and the lamps disposed in an inner space; An optical member disposed above the lamps; And a plurality of holder parts including a fastening part fastened to the bottom cover, a holder holding the lamps, and an arrow-shaped first protrusion connected to the holder, and supporting each of the lamps at a predetermined height in the bottom cover. And a lamp guide having at least one first support for supporting the optical member from below, and a second support having a plurality of first holes into which the first protrusions of the holders can be inserted, wherein the second support is provided with the lamp. It is disposed long from one side of the bottom cover to the other side in the direction intersecting the field.

The first support part is composed of a support for supporting the optical member from below and an arrow-shaped second protrusion to which the support is connected.

The second support portion further includes a plurality of second holes into which the second protrusion is inserted.

The first support part is formed on a holder of the holder part.

A liquid crystal display device according to a first embodiment of the present invention includes a liquid crystal display panel; And a plurality of lamps, a bottom cover having an upper side and the lamps disposed in an inner space, an optical member disposed on the lamps, and a lamp guide holding the lamps while supporting the optical member on the bottom cover. And a backlight unit for irradiating light to the liquid crystal display panel, wherein the lamp guide includes a fastening part fastened to the bottom cover, a holder holding the lamps, and a first slider connected to the holders. A plurality of holder portions supporting each of the holders at a predetermined height in the bottom cover, at least one support portion supporting the optical member from below, and a guide rail into which the first slider of the holder portion is movably inserted; The guide rail is one side to the other side of the bottom cover in the direction crossing the lamps How long it is disposed.

In accordance with another aspect of the present invention, a liquid crystal display device includes: a liquid crystal display panel; And a plurality of lamps, a bottom cover having an upper side and the lamps disposed in an inner space, an optical member disposed on the lamps, and a lamp guide holding the lamps while supporting the optical member on the bottom cover. And a backlight unit for irradiating light to the liquid crystal display panel, wherein the lamp guide includes a fastening part fastened to the bottom cover, a holder holding the lamps, and an arrow-shaped first protrusion connected to the holder. A plurality of holder portions for supporting each of the lamps to a predetermined height in the bottom cover, at least one first supporting portion for supporting the optical member from below, and a plurality of first holes into which the first protrusions of the holder portions can be inserted And a second support formed therein, wherein the second support covers the bottom cover in a direction crossing the lamps. It is arranged in the long side to the other side.

Other objects and advantages of the present invention will become apparent from the following description of preferred embodiments of the present invention with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 3 to 9.

3 is a diagram illustrating a liquid crystal display using a backlight unit according to a first embodiment of the present invention.

Referring to FIG. 3, the liquid crystal display according to the first exemplary embodiment of the present invention includes a liquid crystal display panel 70 and a backlight unit 71 for irradiating light to the liquid crystal display panel 70.

The liquid crystal display panel 70 is formed by arranging liquid crystal cells in an active matrix form between an upper glass substrate and a lower glass substrate. On the lower glass substrate, a plurality of data lines and a plurality of gate lines are arranged to cross each other, and thin film transistors are formed at each crossing portion thereof. The TFT supplies the data from the data line to the liquid crystal cell in response to the scan pulse from the gate line. For this purpose, the gate electrode of the TFT is connected to the gate line, and the source electrode is connected to the data line. The drain electrode of the TFT is connected to the pixel electrode of the liquid crystal cell. In addition, a storage capacitor is formed on the lower glass substrate of the liquid crystal display panel 70 to maintain the voltage of the liquid crystal cell. The storage capacitor may be formed between the liquid crystal cell and the front gate line, or may be formed between the liquid crystal cell and a separate common line. A color filter, a common electrode, a black matrix, and the like are formed on the upper glass substrate of the liquid crystal display panel 70. On each of the upper and lower glass substrates, a polarizing plate for filtering linearly polarized light and an alignment film for setting the pretilt angle of the liquid crystal molecules are formed. The liquid crystal molecules are driven according to an electric field between the common electrode of the upper glass substrate and the pixel electrode of the lower glass substrate to modulate the light incident from the backlight unit 71 through the polarizer. Gate drive integrated circuits and data drive integrated circuits are electrically connected to the liquid crystal display panel 70 through a tape carrier package (TCP) to supply signals to the gate lines and the data lines.

The backlight unit 71 may include an optical member including a bottom cover 52, a reflecting plate 54, a lamp guide 56, a plurality of lamps 58, a diffusion plate 60, and a plurality of optical sheets 62. Include.

The bottom cover 52 is made of a container structure in which a plurality of lamps 58 are accommodated in an inner space, and a reflecting plate 54 is formed on the inner space.

The lamps 58 are formed of a cylindrical lamp such as a cold cathode fluorescent lamp or an external electrode fluorescent lamp to generate light, and the light generated from the lamps 58 is all diffused by the reflecting plate 54. Is investigated.

The diffuser plate 60 includes a plurality of beads, which scatter light using the beads.

The optical sheets 62 include one or more diffusion sheets and one or more prism sheets to uniformly irradiate the light incident from the diffusion plate 60 to the entire liquid crystal display panel, and to provide light in a direction perpendicular to the display surface. It breaks the progress path and concentrates the light to the front of the display surface.

3 to 5, the lamp guide 56 may be molded in a plastic material to fix at least one lamp 58. The lamp guide 56 includes a holder portion 56a, a support portion 56b, a guide rail 56c, and a fastening portion 56d.

The holder portion 56a is formed of an object different from the guide rail 56c, and has an opening for inserting the lamp 58 and supports the holder 81 and the holder 81 that surround the rounded portion of the lamp 58. And a first slider 83 that is movable within the holder support 82 and the guide rail 56c. By the first slider 83, the lamp guide 56 of the backlight unit 71 according to the first embodiment of the present invention can change the position of the holder portion 56a according to the arrangement interval of the lamps 58. Do.

The supporting portion 56b includes a support 84 supporting the diffuser plate 60 and the optical sheets 62 and a second slider 85 movable inside the guide rail 56c. The support 84 has a conical shape, ie, a width narrowing upward so that the area of contact with the diffuser plate 60 can be minimized. The support portion 56b may be formed in a slider structure to have mobility as shown in FIG. 4 or may be integrally formed to be fixed to the guide rail 56c.

The guide rail 56c is positioned in the direction intersecting the major axis direction of the lamp 58 on the inner space surface of the bottom cover 54 on which the reflector plate 54 is formed, and on the other side of the bottom cover 54. Are placed long. The first slider 83 and the second slider 85 are movably inserted into the guide rail 56c, and a fastening portion 56 d is formed on the outer bottom surface. A plurality of holes are formed at the side surface of the guide rail 56c, and the holes (as shown in FIG. 5) may be fixed to the first slider 83 and the second slider 85 at positions corresponding to the arrangement intervals of the lamps 58. The screw 59 is fastened through 57.

The fastening part 56d is formed in the form of a clamp to fasten the lamp guide 56 and the bottom cover 52, and the bottom cover 52 and the reflector plate 54 have the fastening part 56d inserted therein. It has a hole 53 that can be. The clamp may be formed in various ways, and the fastening part 56d illustrated in FIG. 5 is a hook shape, and the bottom cover 52 and the reflector plate 54 are fixed grooves so that the hook is inserted and fixed. It further includes (53a).

6 and 7 are views showing another fixing method of the holder portion 56a and the support portion 56b and the guide rail 56c.

6 and 7, the guide rail 56c has a plurality of grooves 63 in the upper inner surface, and each of the first slider 83 and the second slider 85 has an upper surface and a second support portion ( At least one protrusion 65 is provided at the overlap of 56c. The protruding portion 65 is inserted into the groove 63 corresponding to the arrangement interval of the lamp 58 among the grooves 63 of the guide rail 56c, thereby fixing the holder portion 56a to the guide rail 56c. . In other words, the first slider 83 and the second slider 85 are formed in the form of a clamp, which can be moved inside the guide rail 56c and can be fastened to the groove 63 of the guide rail 56c.

FIG. 8 is a view showing another example of the holder portion 56a. The structure of the lamp guide 56 is simplified because the support portion 56b is integrally formed on the holder portion 56a.

9 is a view illustrating a lamp guide of a backlight unit according to a second embodiment of the present invention.

Since the lamp guide 96 shown in FIG. 9 can be applied to a liquid crystal display device having the same structure as shown in FIG. 3, descriptions of other parts except for the lamp guide 96 and the lamp guide 96 and the bottom are provided. Description of the fastening of the cover will be omitted.

Referring to FIG. 9, the lamp guide 96 of the backlight unit according to the second exemplary embodiment of the present invention may be molded in a plastic material to fix at least one lamp. The lamp guide 96 includes a holder portion 96a, a first support portion 96b, a second support portion 96c, and a fastening portion 96d.

The holder portion 96a is formed of a different object from the second support portion 96c, and has a holder 91 for opening a lamp and encloses a rounded portion of the lamp, and a holder support portion for supporting the holder 91 ( 92 and a projection 93 that is mated with the groove 97 of the second support portion 96c. The projection 93 shown in the figure is an arrow-shaped projection, and may be any shape that is easily inserted into the groove 97 of the second support portion 96c and is not easily removed as well as the arrow-shaped projection. The projection 93 is inserted into the groove 97 corresponding to the arrangement interval of the lamp, so that the position of the holder portion 96a can be changed according to the arrangement interval of the lamp even if the arrangement interval of the lamp is changed. As shown in FIG. 8, the holder part 96a according to the second exemplary embodiment of the present invention may be formed in a form in which the holder part 96a and the first support part 96b are integrated.

The first support part 96b supports the diffuser plate and the optical sheets, and has a conical shape, that is, a width narrowing upward to minimize the area of contact with the diffuser plate. The first support part 96b may be attached to the second support part 96c or may be formed in a fastening structure having protrusions such as the holder part 96a so as to be variable in position.

The second support part 96c is positioned in the direction intersecting the major axis direction of the lamp on the inner space surface of the bottom cover on which the reflector is formed, and has a plurality of grooves 97 into which the protrusions 93 of the holder part 96a can be inserted. In the form of a bar (Bar) is arranged long from one side of the bottom cover to the other side. At this time, the groove 97 has a form that is mated with the projection (93). A plurality of grooves 97 are formed on the upper surface of the second support portion 96c, and the protrusions 93 of the holder portion 96a are inserted into the grooves 97 corresponding to the lamp spacing, and the fastening portion is provided on the lower surface. 96d is formed.

The fastening part 96d is fastened to the bottom cover and the reflector in the same structure as described through the first embodiment of the present invention.

As described above, the backlight unit and the liquid crystal display device using the same according to the present invention have a lamp guide that can form the position of the holder part differently according to the arrangement interval of the lamp, thereby newly manufacturing the mold of the lamp guide and the bottom cover. If not, the position of the holder can be changed according to the type of liquid crystal display.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

Claims (44)

delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete A plurality of lamps; A bottom cover having an upper side opened and the lamps disposed in an inner space; An optical member disposed above the lamps; And A plurality of holder portions configured by a fastening portion fastened to the bottom cover, a holder holding the lamps and an arrow-shaped first protrusion connected to the holder, and supporting each of the lamps at a predetermined height in the bottom cover, the optical A lamp guide having at least one first support for supporting the member from below, and a second support formed with a plurality of first holes into which the first projections of the holders can be inserted, And the second support part is disposed to extend from one side of the bottom cover to the other side in a direction crossing the lamps. 20. The method of claim 19, And the first support part includes a support for supporting the optical member from below and an arrow-shaped second protrusion to which the support is connected. 21. The method of claim 20, And the second support portion further includes a plurality of second holes into which the second protrusion is inserted. 20. The method of claim 19, And the first support part is formed on a holder of the holder part. delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete A liquid crystal display panel; And A plurality of lamps, a bottom cover having an upper side open and the lamps disposed in an inner space, an optical member disposed on the lamps, and a lamp guide holding the lamps while supporting the optical member on the bottom cover; A backlight unit for irradiating light to the liquid crystal display panel; The lamp guide includes a fastening part fastened to the bottom cover, a holder holding the lamps, and an arrow-shaped first protrusion connected to the holder, and a plurality of holders supporting each of the lamps at a predetermined height in the bottom cover. And a second support having at least one first support for supporting the optical member from below, and a plurality of first holes into which the first protrusions of the holders can be inserted. And the second support portion extends from one side to the other side of the bottom cover in a direction crossing the lamps. 42. The method of claim 41 wherein And the first support part includes a support for supporting the optical member from below, and an arrow-shaped second protrusion to which the support is connected. 43. The method of claim 42, And the second support part further comprises a plurality of second holes into which the second protrusion is inserted. 42. The method of claim 41 wherein And the first support part is formed on a holder of the holder part.

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