KR101031672B1 - Back light of a liquid crystal display device for preventing seperation of a optical sheet - Google Patents

Back light of a liquid crystal display device for preventing seperation of a optical sheet Download PDF

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Publication number
KR101031672B1
KR101031672B1 KR1020030065208A KR20030065208A KR101031672B1 KR 101031672 B1 KR101031672 B1 KR 101031672B1 KR 1020030065208 A KR1020030065208 A KR 1020030065208A KR 20030065208 A KR20030065208 A KR 20030065208A KR 101031672 B1 KR101031672 B1 KR 101031672B1
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KR
South Korea
Prior art keywords
frame
liquid crystal
backlight
optical sheet
crystal display
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KR1020030065208A
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Korean (ko)
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KR20050028697A (en
Inventor
정기용
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020030065208A priority Critical patent/KR101031672B1/en
Publication of KR20050028697A publication Critical patent/KR20050028697A/en
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Publication of KR101031672B1 publication Critical patent/KR101031672B1/en

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Abstract

The backlight of the liquid crystal display device of the present invention includes a backlight unit disposed on one side of the liquid crystal panel and emitting light to the liquid crystal panel, and first and second frames fixing the backlight. Grooves are formed in the first frame, and projections are formed in the second frame so that the grooves are inserted into the projections when the backlight is assembled to firmly fix the first frame and the second frame.
Backlight, Frame, Turning, Groove, Stopper, Optical Sheet

Description

BACK LIGHT OF A LIQUID CRYSTAL DISPLAY DEVICE FOR PREVENTING SEPERATION OF A OPTICAL SHEET}

1 is a view showing the structure of a conventional liquid crystal display module.

Figure 2a is a view showing a backlight structure of a conventional liquid crystal display device.

2B is a view illustrating a case in which an external force is applied to a backlight of a conventional LCD.

3 is a view showing a backlight structure of a liquid crystal display device according to the present invention;

4 is an enlarged perspective view of portion A of FIG.

Explanation of symbols on the main parts of the drawings

110: backlight 111: lamp

113: light guide plate 115: optical sheet

117: reflector 121,122: frame

124: groove 125: projection

The present invention relates to a liquid crystal display device, and more particularly to a backlight of a liquid crystal display device that can prevent the separation of the optical sheet by the external force by changing the frame structure of the liquid crystal display module.

Recently, with the development of various portable electronic devices such as mobile phones, PDAs, and notebook computers, there is a growing demand for flat panel display devices for light and thin applications. Such flat panel displays are being actively researched, such as LCD (Liquid Crystal Display), PDP (Plasma Display Panel), FED (Field Emission Display), VFD (Vacuum Fluorescent Display), but mass production technology, ease of driving means, Liquid crystal display devices (LCDs) are in the spotlight for reasons of implementation.

The liquid crystal display device is a transmissive display device, and since a desired image is displayed on the screen by controlling the amount of light passing through the liquid crystal layer by the refractive anisotropy of the liquid crystal molecules, the liquid crystal display device is installed on the rear side of the liquid crystal panel to emit light. As a result, a backlight for transmitting light through the liquid crystal layer is required.

1 illustrates a structure of a liquid crystal display module having a backlight.

As shown in the figure, the liquid crystal display module 1 is largely comprised of a liquid crystal panel 3 and a backlight 10 provided on the rear surface of the liquid crystal panel 3. The liquid crystal panel 3 is where an actual image is realized, and is composed of a transparent lower substrate 3a such as glass and an upper substrate 3b and a liquid crystal layer (not shown) formed therebetween. In particular, although not shown in the drawing, the lower substrate 3a is a TFT substrate on which a driving element such as a thin film transistor and a pixel electrode are formed, and the upper substrate 3b is formed of a color filter layer. It is a color filter substrate. In addition, a driving circuit unit 5 is provided on the side of the lower substrate 3a to apply signals to the thin film transistor and the pixel electrode formed on the lower substrate 3a, respectively.

The backlight 10 emits light from a lamp 11 that actually emits light, a light guide panel 13 guiding light emitted from the lamp 11 toward the liquid crystal panel 3, and a light emitted from the lamp 11. It consists of a reflector 17, an optical sheet 15, and the like, which reflect light to the light guide plate 13 to improve light efficiency.

When manufacturing the liquid crystal display device, that is, the liquid crystal display module 1, the backlight 10 is manufactured separately from the liquid crystal panel 3. In other words, the backlight 10 is not manufactured in a liquid crystal display device manufacturing factory, but is assembled with a liquid crystal panel 3 manufactured in a separate factory and then completed in the liquid crystal display device manufacturing factory. In this case, the lamp 11, the light guide plate 13, the reflecting plate 17, and the optical sheet 15 constituting the backlight 10 are integrally assembled and supplied to the LCD manufacturing plant, and the assembled backlight 10 is provided. Is assembled with the liquid crystal panel 3 to complete the liquid crystal module 1.

2A is a diagram illustrating the structure of the assembled backlight 10. As shown in the figure, the lamp 11, the light guide plate 13, the optical sheet 15, and the reflecting plate 17 are integrally assembled by the first frame 21 and the second frame 22. Typically, the first frame 21 having a complicated structure is formed by molding, while the second frame 22 is formed by press working. At this time, the first frame 21 and the second frame 22 is fixed by the surface contact, as shown in the figure.

The backlight 10 is assembled in a backlight manufacturing plant and then packaged and transported to a liquid crystal display device manufacturing plant. The transported backlight 10 is assembled with the liquid crystal panel 3 after the packaging is removed to complete the liquid crystal display module. As described above, since the backlight 10 undergoes many processes until final assembly with the liquid crystal panel 3, the backlight 10 always acts on the large and small external force. However, since the first frame 21 and the second frame 22 of the backlight 10 are assembled by simple surface contact, they are easily disassembled by external force. In particular, as shown in FIG. 2B, when the external force acts almost perpendicular to the surface contact between the first frame 21 and the second frame 22, the first frame 21 is driven by the second frame even with a very small external force. Out of contact with (22) it is extruded outward.

As described above, the optical sheet 15 fixedly supported by the first frame 21 when the first frame 21 is separated from the second frame 22 by the external force (including when partially separated). ) Is separated from the backlight 10. When the backlight 10 is assembled with the liquid crystal panel 3 in a state in which the optical sheet 15 is separated, the liquid crystal display device may be defective. Even when the optical sheet 15 is not completely separated from the backlight 15, the optical sheet 15 is out of its original position. Therefore, when the backlight 10 is assembled to the liquid crystal panel 3, the optical sheet 15 may be disposed in the liquid crystal panel. It is not matched with (3), which causes light leakage in the liquid crystal display device.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and the optical sheet is separated from the backlight by preventing the separation of the first frame and the second frame by external force by providing a fixing means for the first frame and the second frame to assemble the backlight. It is an object of the present invention to provide a backlight of a liquid crystal display device capable of preventing it from being made.

In order to achieve the above object, the backlight according to the present invention comprises a lamp for emitting light, a light guide plate for guiding the light emitted from the lamp, a reflecting plate for reflecting light emitted from the lamp to the light guide plate, and the liquid crystal light A backlight unit formed of an optical sheet diffused to a panel side and installed at one side of the liquid crystal panel to emit light to the liquid crystal panel; And a first frame and a second frame for fixing the backlight, wherein the second frame includes a protrusion or a stopper and a groove is formed in the first frame so that the protrusion or the stopper is inserted into the groove. The first frame is fixed and the wall surface of the first frame is inserted into a space formed between the wall surface of the second frame and the protrusion or stopper, and the first frame extends to a part of the upper surface of the optical sheet to backlight the optical sheet. It is characterized by fixing to the part.

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In general, two or three frames may be configured to support the backlight. Although the present invention mainly describes a backlight of a liquid crystal display device assembled by two frames, the present invention is not limited to these two frames but may be applied to a backlight composed of three or more frames. .

In the present invention, when an external force is applied to the first frame, it is possible to prevent a defect due to the detachment of the optical sheet by preventing the first frame from being repelled from the second frame by the external force. In particular, in the present invention, by providing the first frame fixing means of a simple structure, it is possible to fix the frame at low cost.

Hereinafter, a structure of a backlight of a liquid crystal display device according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view of the backlight 110 of the liquid crystal display according to the present invention, and FIG. 4 is an enlarged partial perspective view of part A of FIG.

As shown in the figure, the backlight 110 according to the present invention is a lamp 111 for emitting light, a light guide plate 113 for guiding the light emitted from the lamp 111, and is emitted from the lamp 111 And a reflecting plate 117 for reflecting light to the light guide plate 13 to improve light efficiency and an optical sheet 115 for diffusing light to the liquid crystal panel side. The lamp, the light guide plate 113, the reflecting plate 117 and the optical sheet ( 115 is supported by the first frame 121 and the second frame 122. That is, the backlight 110 is finally assembled by the first frame 121 and the second frame 122. The second frame 122 is formed over the entire bottom surface of the backlight 110 (ie, the bottom surface of the reflecting plate 117), whereas the first frame 121 has a side surface where the light travels along the side of the backlight 110. It is formed only on a part of the front surface excluding the region so that light transmitted through the optical sheet 115 is incident on the liquid crystal panel. In this case, the first frame 121 extends to the edge of the optical sheet 115 to prevent the optical sheet 115 from escaping to the outside.

Meanwhile, a groove 124 in which some regions are removed is formed in the first frame 121 on the side of the backlight 110 in contact with the first frame 121 and the second frame 122, and in the second frame 122. The protrusion 125 is formed so that the protrusion 125 of the second frame 122 into the groove 124 of the first frame 121 when the first frame 121 and the second frame 122 are assembled. Is inserted. The grooves 124 and the protrusions 125 are used to more reliably assemble the first frame 121 and the second frame 122 in simple surface contact. That is, as shown in the figure, when the external force is applied to the protrusion 125 serves as a stopper (stopper) is to prevent the first frame 121 to be folded in the external force direction, that is to the outside.

One or more grooves 124 formed in the first frame 121 and the protrusions 125 installed in the second frame 122 may be formed on both sides of the backlight 110, but each side may be formed on each side for safety of assembly. At least two or more will be formed in each case.

Typically, the first frame 121 is formed by molding and the second frame 122 is formed by pressing. However, the first frame 121 is formed by pressing and the second frame 122 is formed by molding. It may be formed by.

The backlight 110 assembled as described above is packaged and transported to a liquid crystal display device manufacturing process to be assembled with a liquid crystal panel to complete a liquid crystal display device (ie, a liquid crystal display module). Therefore, even when an external force is applied to the backlight 110 during packaging or transportation, the first frame 121 is formed by the groove 124 formed in the first frame 121 and the protrusion 125 provided in the second frame 122. Since the separation from the second frame 122 can be prevented, the optical sheet 115 can be effectively prevented from being separated from the backlight 110.

As described above, in the present invention, since the stopper is formed in the second frame, it is possible to prevent the first frame from being separated from the second frame by an external force. Therefore, since the optical sheet can be prevented from being separated from the backlight or mismatched, the defect of the liquid crystal display device can be prevented.

Claims (5)

  1. And a lamp for emitting light, a light guide plate for guiding light emitted from the lamp, a reflector for reflecting light emitted from the lamp to the light guide plate, and an optical sheet for diffusing light to the liquid crystal panel. A backlight unit installed to emit light to the liquid crystal panel; And
    Composed of the first and second frames for fixing the backlight,
    The second frame is provided with a protrusion or a stopper, and the groove is formed in the first frame so that the protrusion or the stopper is inserted into the groove so that the second frame fixes the first frame and the wall surface of the first frame is the first frame. It is inserted into the space formed between the wall surface and the projection or the stopper of the two frames, the first frame is extended to a portion of the upper surface of the optical sheet to fix the optical sheet to the backlight.
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KR1020030065208A 2003-09-19 2003-09-19 Back light of a liquid crystal display device for preventing seperation of a optical sheet KR101031672B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020030065208A KR101031672B1 (en) 2003-09-19 2003-09-19 Back light of a liquid crystal display device for preventing seperation of a optical sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020030065208A KR101031672B1 (en) 2003-09-19 2003-09-19 Back light of a liquid crystal display device for preventing seperation of a optical sheet

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KR20050028697A KR20050028697A (en) 2005-03-23
KR101031672B1 true KR101031672B1 (en) 2011-04-29

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101232045B1 (en) * 2005-08-24 2013-02-12 삼성디스플레이 주식회사 Back light assembly and liquid crystal display apparatus having the same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11109340A (en) 1997-10-02 1999-04-23 Sanyo Electric Co Ltd Liquid crystal display device
KR20000009869A (en) * 1998-07-29 2000-02-15 윤종용 Back light assembly
JP2001126522A (en) * 1999-10-28 2001-05-11 Sharp Corp Back light
JP2002090710A (en) * 2000-09-18 2002-03-27 Sanyo Electric Co Ltd Planar panel display device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11109340A (en) 1997-10-02 1999-04-23 Sanyo Electric Co Ltd Liquid crystal display device
KR20000009869A (en) * 1998-07-29 2000-02-15 윤종용 Back light assembly
JP2001126522A (en) * 1999-10-28 2001-05-11 Sharp Corp Back light
JP2002090710A (en) * 2000-09-18 2002-03-27 Sanyo Electric Co Ltd Planar panel display device

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