KR101285271B1 - Liquid crystal display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device, wherein the liquid crystal display device includes a liquid crystal panel, a lamp for supplying light to the liquid crystal panel, a lamp holder having an insertion hole into which the lamp is inserted, and the lamp holder is fastened. It is configured to include a cover bottom is formed fastening hole.

Backlight Unit, Lamp, Lampholder, Cover Bottom

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

1 is an exploded perspective view showing a liquid crystal display device according to the prior art.

2 is a perspective view illustrating a part of the backlight unit according to an embodiment of the present invention, in which a plurality of lamps are disposed.

Figure 3 is an exploded perspective view showing a coupling portion of the backlight unit according to an embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view of a portion A of FIG. 3 and illustrating an engagement state of a lamp holder and a lamp; FIG.

5 is a perspective view showing a plurality of lamp arrangement state according to another embodiment of the present invention.

Figure 6 is a perspective view showing a plurality of lamp arrangement state according to another embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

110: liquid crystal panel 120: backlight unit

121: lamp 122: bottom cover

124: fastener 131: lamp holder

134: insertion hole

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of realizing a high quality liquid crystal display device without changing the structure of the lamp holder to reduce the brightness or uniformity of the liquid crystal display device.

In recent years, the rapid development of the information and communication field has increased the importance of display devices for displaying various information, and one of the existing display devices, the Cathode Ray Tube, cannot meet the latest trend of light weight and thinning. .

Accordingly, liquid crystal displays (LCDs), plasma display panels (PDPs), and electroluminescence displays (ELDs), etc., have been developed as flat panel displays to meet expectations, and research and development have been actively progressed. It is becoming.

In this regard, the liquid crystal display according to the related art will be described with reference to FIG. 1.

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

Referring to FIG. 1, the liquid crystal display according to the related art includes a liquid crystal panel 10 and a backlight unit 20 disposed under the liquid crystal panel 10. Since the liquid crystal display does not emit light by itself, light is supplied to the liquid crystal panel 10 by using a backlight unit 20.

Although not shown in the figure, the liquid crystal panel 10 includes an upper substrate 10a and a lower substrate 10b facing each other, and a liquid crystal layer formed between the two substrates.

The liquid crystal layer is a material having optical anisotropy, and may adjust the light transmittance in a manner in which the orientation is changed according to the applied voltage. Accordingly, a still image or a moving image corresponding to the light transmittance of the liquid crystal layer is displayed on the liquid crystal panel 10.

A thin film transistor as a switching element is formed on the lower substrate 10b of the two substrates 10a and 10b to display an image according to on / off driving of the thin film transistor.

Meanwhile, the liquid crystal panel 10 is connected to gate and source printed circuit boards 15a and 15b for outputting image signals and scan signals to the liquid crystal panel.

The backlight unit 20 used as a light source of the liquid crystal display device is positioned under the liquid crystal panel 10 to supply light toward the liquid crystal panel 10. The backlight unit 20 includes a lamp 21 provided under the liquid crystal panel 10, an optical sheet 23 provided between the liquid crystal panel 10 and the lamp 21, and the lamp 21. It is provided in the lower portion and consists of a bottom cover 22, etc. for accommodating the liquid crystal panel 10 and the lamp 21.

As shown in FIG. 1, lamps 21 are arranged in series in the backlight unit 20, and the backlight unit of this type is called a direct backlight unit.

The lamp 21 supplies light to the liquid crystal panel 10, and the light emitted from the lamp 21 is supplied to the liquid crystal panel 10 through the optical sheet 23 between the liquid crystal panel 10. .

An inverter 25 for supplying power to the lamp 21 is electrically connected to the lamp 21 through a wire.

The optical sheet 23 is to increase the efficiency of light emitted from the lamp, and is composed of a diffusion sheet, a prism sheet, a protective sheet, and the like to diffuse the light.

However, in recent years, since the liquid crystal display device is becoming more and more large, the length of the lamp is also gradually increasing in proportion to it.

In this way, when the length of the lamp becomes longer, the middle part of the lamp may be bent in the direction of gravity due to gravity, and a dark part is formed at the electrode parts at both ends of the lamp by continuous use, resulting in an uneven luminance distribution. The image quality of the image will be degraded.

In particular, when the lamp is driven at a high pressure, ozone, which is a pollutant, may be generated and leakage current may be generated.

In addition, since the diameter of the lamp itself is widened, it is difficult to emit light efficiently and there is a problem that the efficiency of the lamp is also reduced.

In order to solve this problem, the lamp may be used vertically, but the human field of view is more sensitive to vertical lines than horizontal lines, so that the image appears uneven.

Accordingly, an object of the present invention is to provide a liquid crystal display device capable of minimizing dark portions of an image portion of a liquid crystal display device.

In addition, another object of the present invention is to provide a liquid crystal display device which can implement a high-quality image without deteriorating luminance or uniformity even in a large-area liquid crystal display device by effectively placing a plurality of lamps using a lamp holder.

According to an aspect of the present invention, a liquid crystal display device includes a liquid crystal panel, a lamp for supplying light to the liquid crystal panel, a lamp holder having an insertion hole into which the lamp is inserted, and a fastening hole to which the lamp holder is fastened. Characterized by including a cover bottom formed.

The lamp holder is inserted perpendicularly through the cover bottom.

The lamp holder is characterized in that the locking jaw is formed on the upper and lower, the upper locking jaw is formed longer in the direction in which the hole is formed than the lower locking jaw.

The distance between the upper locking jaw and the lower locking jaw is formed to be equal to the thickness of the cover bottom.

The lamp holder is formed of an insulator having elasticity, and is preferably formed of a silicon material.

In this case, the lamp may use a cold cathode fluorescent lamp (CCFL) or an external electrode fluoresent lamp (EEFL).

Hereinafter, a liquid crystal display according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a perspective view illustrating a part of the backlight unit according to an embodiment of the present invention, in which a plurality of lamps are disposed.

3 is an exploded perspective view illustrating a coupling part of a backlight unit according to an exemplary embodiment of the present invention.

4 is an enlarged cross-sectional view illustrating a coupling state of a lamp holder and a lamp by enlarging a portion A of FIG. 3.

Referring to FIG. 2, the liquid crystal display according to the present invention outputs an image signal and a scan signal to the liquid crystal panel 110, the backlight unit 120 for supplying light to the liquid crystal panel 110, and the liquid crystal panel 110. Gate and data drive printed circuit boards 115a and 115b.

The liquid crystal panel 110 includes an upper substrate 110a and a lower substrate 110b facing each other, and a liquid crystal layer (not shown) formed between the two substrates. The liquid crystal panel 110 has a different orientation of the liquid crystal layer according to the voltage applied thereto, and a still image or a moving image corresponding thereto according to the light transmittance of the liquid crystal layer is displayed on the liquid crystal panel 110.

A thin film transistor, which is a switching element, is formed on the lower one of the two substrates 110a and 110b to display an image according to the on / off driving of the element.

2 to 4, the backlight 120 includes a lamp 121 that supplies light to the liquid crystal panel 110, and an insertion hole 134 into which both ends of the lamp 121 are inserted. It comprises a holder 131, and a cover bottom 122 is formed with a fastening hole 124 to which the lamp holder 131 is fastened.

Here, the lamp 121 is inserted into and fixed to the lamp holder 131, and the lamp holder 131 into which the lamp 121 is inserted is a cover bottom 122 having a fastening hole 124 for the lamp holder. Is fastened to. Portions other than the bent ends of the lamp 121 are spaced apart from each other by a predetermined distance between the liquid crystal panel and the cover bottom 122.

Referring to FIG. 4, the lamp 121 has a bent portion 121c in which a part of both ends of the main body is formed to be bent, and the bent portion 121c is provided with an electrode 121a of the lamp.

Both ends provided with the electrode 121a are positioned at the bent portion 121c of the lamp 121 to prevent brightness reduction and uniformity of the liquid crystal display device, and then are fastened to the cover bottom 122 to the image. Do not appear dark.

The bent portion 121c of the lamp 121 may be appropriately adjusted in length in consideration of the position of the electrode 121a, the size of the lamp holder 131, the coupling distance to the cover bottom 122, and the like.

The lamp 121 is electrically connected through an electric wire 121b to an inverter (not shown) that supplies power.

Referring to FIG. 4, the lamp holder 131 for fixing the lamp 121 has an insertion hole 134 into which the bent portion 121c of the lamp 121 is inserted, and is inserted into the insertion hole 134. The bent portion 121c of the lamp is inserted.

The insertion hole 134 may be formed to penetrate in both directions to be electrically connected to the inverter even after the bent portion 121c of the lamp 121 is inserted.

At this time, the lamp holder 131 is preferably formed of an insulator. This is to prevent leakage of a high-voltage current applied inside the lamp 121.

In addition, the lamp holder 131 is preferably made of an elastic material, the diameter of the insertion hole 134 into which the lamp 121 is inserted is preferably formed to be the same as or slightly smaller than the diameter of the lamp 121. Do.

This is because the lamp holder 131 to fix the lamp 121 with an appropriate elastic force and pressure, it is possible to firmly secure the lamp tightly if there is elasticity even if the diameter is the same or slightly smaller.

Therefore, the lamp holder 131 may be manufactured as long as the material has adequate elasticity and insulation, but it is preferable to form the silicon (Si) material.

On the other hand, the lamp holder 131 is preferably formed of a white or transparent material in order to maximize the efficiency of the light emitted from the lamp 121.

In the lamp holder 131, locking jaws 131a and 131b are formed at an upper side and a lower side of the lamp holder 131 to fix the cover bottom 122 firmly.

The upper locking jaw 131a or the lower locking jaw 131b is formed to be inclined so that the diameter of the lamp holder 131 increases toward the center portion of the lamp holder 131. A coupling groove 131c is coupled to the cover bottom at an appropriate position between the upper and lower locking jaws 131a and 131b of the lamp holder 131.

An interval between the upper and lower locking projections 131a and 131b of the lamp holder 131 is formed to be equal to or smaller than the thickness of the cover bottom 122.

When the lamp holder 131 having the above configuration is coupled to the fastening hole 124 formed in the cover bottom 122, the cover bottom 122 is tightly attached to the groove 131c and the upper and lower locking jaws ( 131a, 131b) is difficult to detach.

The length H of the upper locking jaw formed in the lamp holder 131 may be adjusted in consideration of the length of the bent portion of the lamp 121 or the distance between the cover bottom 122 and the lamp 121.

Preferably it is formed to be equal to or longer than the length (h) of the lower locking jaw to maintain the distance between the lamp 121 and the cover bottom 122 at a predetermined distance.

On the other hand, the cover bottom 122 serves to receive and protect the liquid crystal panel and the lamp 121 and is located under the lamp 121.

A plurality of fastening holes 124 are formed in the cover bottom 122 to fasten the lamp holder 131 according to the installation position of the lamp.

Although not shown in the cover bottom 122, an optical sheet for increasing light efficiency, such as a reflecting plate, may be additionally stacked as necessary, and in this case, a fastening hole may be formed in the optical sheet to fasten the lamp holder 131. May be

The fastening hole 124 is formed in accordance with the diameter of the groove 131c portion between the two locking projections 131a and 131b of the lamp holder 131, and is smaller than or equal to the diameter of the groove portion of the lamp holder 131. Form.

 As described above, when the curved lamp 121 is fastened to the cover bottom 122 through the lamp holder 131, a dark portion of the lamp does not appear in an image, thereby providing a liquid crystal display having improved luminance and uniformity. have.

In addition, the electrode part may be firmly fixed with an insulator to prevent leakage of current.

In addition, due to the improvement in brightness and uniformity, it is not necessary to use a long lamp, which is advantageous in that it can be applied to a large area liquid crystal display device.

Meanwhile, the lamp arrangement of the liquid crystal display according to the exemplary embodiment of the present invention will be described with reference to FIGS. 5 and 6 as follows.

5 is a perspective view showing a plurality of lamp arrangement state according to another embodiment of the present invention, Figure 6 is a perspective view showing a plurality of lamp arrangement state according to another embodiment of the present invention.

That is, when the area for supplying light so that the image of the liquid crystal panel is displayed as a light emitting area, FIG. 5 divides the light emitting area where the light of the lamp is generated into two areas and a plurality of lamps 221 and 321 are serially arranged according to each area. It is an Example arrange | positioned.

6 is an embodiment in which a plurality of serially arranged alternately in two regions.

5 and 6, in each embodiment, a fastening hole (not shown) is formed in the cover bottoms 222 and 322 according to the arrangement of the lamps 221 and 321, and the lamp holders 231 and 331 are used. The lamps 221 and 321 are fixed to the cover bottoms 222 and 322.

By disposing the lamps 221 and 321 in a plurality of areas as in the above-described embodiment, problems such as leakage current due to high voltage application may be solved.

In the reference drawings, only the lamps are divided into two areas, but the lamps may be divided into a plurality of areas, and the area of the area may be divided into various sizes. Depending on the length or type of lamp, the arrangement may be appropriately applied.

In addition, although not shown, an inverter is provided on the back of the cover bottom, and the inverter is for supplying power to the lamp, and an appropriate inverter may be used according to the arrangement or type of the lamp.

In the exemplary embodiment of the present invention, since the electrode part of the lamp is exposed to the rear surface of the cover bottom, the wires are connected, and thus, there is an advantage in that it is easily connected to the inverter.

Meanwhile, even when the lamp is fastened to the cover bottom by using the lamp holder, the lamp guide may be additionally disposed as necessary.

Even when the lamp holder is used, a sagging phenomenon may occur in the case of a sufficiently long lamp, and thus an additional lamp guide may be provided to fix the lamp.

At this time, the lamp guide is for fixing and supporting the lamp, and the existing lamp guide may be used.

The present invention is not limited only to the structure as described above. The above-described structure is only one example for explaining the present invention. For example, the size or shape of a suitable lamp holder may vary according to the type of lamp used in a liquid crystal display, the shape or thickness of a cover bottom, and various applications are possible.

In addition, in the exemplary embodiment of the present invention, only the lamps are arranged by dividing the light emitting area into two areas, but the lamps may be divided in various ways, and thus the lamps may be variously applied.

Accordingly, the scope of the present invention should not be defined by the above detailed description, but should be defined by the appended claims.

As described above, the liquid crystal display according to the present invention has the following effects.

According to the present invention, a lamp having a bent portion and a bent portion is coupled to a cover bottom by using a lamp holder, thereby reducing the dark portion of the image, thereby improving the image quality, and reducing the leakage of current due to the high voltage of the lamp.

In addition, according to an exemplary embodiment of the present invention, the light emitting surface may be divided into a plurality of regions, and thus the lamps may be arranged in various ways, thereby being applicable to a large-area liquid crystal display and providing an image with high brightness and uniformity.

Claims (18)

A liquid crystal panel; A plurality of lamps alternately arranged in two or more light emitting regions for supplying light to the liquid crystal panel and having bent portions at both ends; A lamp holder having an insertion hole into which the lamp is inserted; And It is configured to include a cover bottom formed with a fastening hole to which the lamp holder is fastened, The lamp holder, And an upper locking jaw and a lower locking jaw that are inclined in a shape of increasing diameter toward an upper portion and a lower portion thereof, respectively, and a coupling groove coupled to the cover bottom. The method of claim 1, And the lamp holder penetrates and is perpendicular to the cover bottom. delete delete The method of claim 1, And a bent portion of the lamp is fastened to the fastening hole of the cover bottom through the lamp holder. The method of claim 1, And a distance between the upper locking jaw and the lower locking jaw is equal to the thickness of the cover bottom. The method of claim 1, And the lamp holder is formed of an insulator having elasticity. The method of claim 7, wherein And the lamp holder is formed of a silicon material. The method of claim 1, The lamp is a liquid crystal display, characterized in that the CCFL or EEFL. A plurality of lamps alternately arranged in two or more light emitting regions for supplying light to the liquid crystal panel and having bent portions at both ends; A lamp holder having an insertion hole to which the lamp is inserted and fastened; And The liquid crystal panel and the lamp is accommodated, and includes a cover bottom formed with a fastening hole for the lamp holder is fastened, The lamp holder, A backlight unit having an upper locking jaw and a lower locking jaw that are inclined to form a diameter toward an upper portion and a lower portion thereof, respectively, and a coupling groove coupled to the cover bottom. The method of claim 10, The lamp holder is penetrating perpendicular to the cover bottom is inserted into the backlight unit. delete delete The method of claim 10, The bent portion of the lamp is a backlight unit, characterized in that fastening to the fastening hole of the cover bottom through the lamp holder. The method of claim 10, And a distance between the upper locking jaw and the lower locking jaw is equal to the thickness of the cover bottom. The method of claim 10, The lamp holder is formed of an insulator having elasticity. 17. The method of claim 16, The lamp holder is formed of a silicon material. The method of claim 10, And the lamp is CCFL or EEFL.

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