KR20080075976A - Backlight unit for liquid crystal display device - Google Patents

Backlight unit for liquid crystal display device Download PDF

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Publication number
KR20080075976A
KR20080075976A KR1020070015265A KR20070015265A KR20080075976A KR 20080075976 A KR20080075976 A KR 20080075976A KR 1020070015265 A KR1020070015265 A KR 1020070015265A KR 20070015265 A KR20070015265 A KR 20070015265A KR 20080075976 A KR20080075976 A KR 20080075976A
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KR
South Korea
Prior art keywords
lamp
liquid crystal
fluorescent lamps
backlight unit
lamp guide
Prior art date
Application number
KR1020070015265A
Other languages
Korean (ko)
Inventor
허강
Original Assignee
엘지디스플레이 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지디스플레이 주식회사 filed Critical 엘지디스플레이 주식회사
Priority to KR1020070015265A priority Critical patent/KR20080075976A/en
Publication of KR20080075976A publication Critical patent/KR20080075976A/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/0075—Fastening of light sources or lamp holders of tubular light sources, e.g. ring-shaped fluorescent light sources
    • F21V19/008—Fastening of light sources or lamp holders of tubular light sources, e.g. ring-shaped fluorescent light sources of straight tubular light sources, e.g. straight fluorescent tubes, soffit lamps
    • F21V19/009—Fastening of light sources or lamp holders of tubular light sources, e.g. ring-shaped fluorescent light sources of straight tubular light sources, e.g. straight fluorescent tubes, soffit lamps the support means engaging the vessel of the source
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133604—Direct backlight with lamps
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133608—Direct backlight including particular frames or supporting means
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Planar Illumination Modules (AREA)

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device. More specifically, in a direct backlight unit of a liquid crystal display device, a lamp is capable of reducing luminance unevenness due to screening to a minimum while directly holding a fluorescent lamp that emits light. A lamp guide including a holder.

A feature of the present invention is that the first and second lamp holders of the lamp guide that supports a plurality of fluorescent lamps and prevents sagging of the optical sheet, etc. are sequentially arranged side by side at intervals of one pitch. Of the third fluorescent lamps, only the first and the third fluorescent lamps are respectively fixed.

As a result, more uniform and higher luminance can be realized by minimizing luminance non-uniformity caused by obscuring the fluorescent lamp.

In addition, by controlling the distance between the optical sheet and the fluorescent lamp within a desired range to realize a uniform surface light source, it is possible to greatly reduce the shaking or breakage of the fluorescent lamp due to external impact.

Description

Backlight unit for liquid crystal display device

1 is a cross-sectional view of a liquid crystal display device using a general direct type backlight unit.

2 is a partial cross-sectional view of a backlight unit including a general lamp guide.

3 is a plan view illustrating a luminance distribution according to a light emitting state of a general backlight unit;

4 is an exploded perspective view of a liquid crystal display module according to the present invention.

5a and 5b are respectively a perspective view and a front view of the lamp guide according to the present invention.

6 is a plan view showing a luminance distribution according to the light emission state of the backlight unit according to the present invention.

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

124: fluorescent lamp 160: lamp guide

162: support 164: fixed end

166a, 166b: first and second lampholders

168 support part

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device. More specifically, in a direct backlight unit of a liquid crystal display device, a lamp is capable of reducing luminance unevenness due to screening to a minimum while directly holding a fluorescent lamp that emits light. A lamp guide including a holder.

In line with the recent information age, the display field has also been rapidly developed, and as a flat panel display device (FPD) having advantages of thinning, light weight, and low power consumption, a liquid crystal display device: LCD, Plasma Display Panel (PDP), Electroluminescence Display (ELD), Field Emission Display (FED), etc. : It is rapidly replacing CRT.

Among them, LCDs are excellent in moving image display and are most actively used in notebooks, monitors, TVs, etc. due to high contrast ratio. The LCDs are devices that do not have their own light emitting elements. It requires a light source. As a result, a backlight unit having a fluorescent lamp is provided on the rear surface to irradiate light toward the front of the liquid crystal panel, thereby realizing an image of identifiable luminance. In this case, a cold cathode fluorescent lamp (CCFL) or an external electrode fluorescent lamp (EEFL) is used as a light source for generating light.

Meanwhile, a general backlight unit is classified into an edge type and a direct type according to the arrangement of fluorescent lamps. The edge type has a structure in which one or a pair of lamps is disposed at one side of the light guide plate. Alternatively, two or two pairs of lamps may be disposed on both sides of the light guide plate, and the direct type may have a structure in which several lamps are disposed below the optical sheet.

In this case, the edge type has an advantage of being easy to manufacture while disadvantageous to a large screen, but the direct type has a relatively advantageous advantage for a large liquid crystal display with respect to high uniformity of light.

1 is a cross-sectional view of a liquid crystal display using a general direct type backlight unit.

As shown, a general liquid crystal display module includes a liquid crystal panel 10 and a backlight unit 20 including upper and lower substrates 12 and 14, a support main 30, a cover bottom 50, and a top cover 40. It is composed of

The liquid crystal panel 10 includes a printed circuit board (not shown) at one side thereof, and a backlight unit 20 is provided at the rear thereof, and a top cover 40 coupled to the cover bottom 50 at an edge thereof. The liquid crystal panel 10 and the backlight unit 20 are fixed integrally with each other.

The backlight unit 20 includes a reflective sheet 22, and a plurality of fluorescent lamps 24 are arranged side by side on an upper surface thereof, and a plurality of optical sheets 26 are interposed therebetween. do.

The most important role of the backlight unit 20 is to supply a high-quality surface light source to the liquid crystal panel 10, and various optical designs for this purpose are considered. Among them, the fluorescent lamp 24 and the optical sheet 26 are considered. Proper spacing between them is an important factor. That is, when the distance a between the fluorescent lamp 24 and the optical sheet 26 is too small, the outer shape of the fluorescent lamp 24 is reflected and a stripe-shaped line light source is incident on the liquid crystal panel 10. In the opposite case, deterioration in brightness is followed, so that the interval a between them must be controlled accurately.

In particular, considering that the size of the optical sheet 26 including the fluorescent lamp 24 is increasing in accordance with the recent trend of large area of the display device, which is rapidly progressing, deflection due to each load For this reason the adjustment of the gap a between them is considered more demanding.

Accordingly, by preventing the deflection of the fluorescent lamp 24 and the optical sheet 26 by using a lamp guide (not shown), the distance a between them is made constant, and the fluorescent lamp 24 by impact ) To reduce the possibility of shaking and breakage.

2 is a view schematically illustrating a structure of a lamp guide 60 that supports the fluorescent lamp 24 and makes a distance a between the fluorescent lamp 24 and the optical sheet 26 constant. On the back of the support 62 of the lamp guide 60 seated on the reflective sheet 22, a fixed end 64 penetrating the reflective sheet 22 and the cover bottom 50 to fix the whole is provided. (62) On the upper surface, a pair of lampholders 66 each having an annular shape in which one direction is opened to protrude adjacent two mutually adjacent fluorescent lamps 24 protrudes, and a support between them ( 62) From the upper surface, a columnar support portion 68 of a cone or square pyramid protrudes to support the optical sheet 26.

Therefore, when using the lamp guide 60, by preventing the deflection of the optical sheet 26 by the support 68, it is possible to uniformly control the interval between the fluorescent lamp 24 and the optical sheet 26. By firmly fixing the fluorescent lamp 24 to the reflective sheet 22 at a constant height by the pair of lamp holders 66, the possibility of shaking and breakage can be greatly reduced.

However, such a general lamp guide 60 exhibits some problems. In particular, since the specific positions of the fluorescent lamps 24 adjacent to each other are simultaneously covered, the light loss and the partial luminance decrease are more clearly found.

That is, FIG. 3 shows luminance distribution according to the light emission state of the backlight unit 20 of FIG. 1 using the lamp guide 60 to fix the fluorescent lamp 24 seated on the general reflective sheet 22. As a plan view, a circular blob (b) having a relatively low brightness appears in a portion where the lamp guide 60 is placed, and the blob (b) appears immediately next to each other, whereby the shape of the blob (b) becomes more conspicuous. Has a visible problem.

The present invention is to solve the above problems, by realizing a uniform surface light source by preventing the deflection phenomenon of the optical sheet and at the same time to minimize the light loss due to the obstruction of the fluorescent lamp can achieve a more uniform and high brightness It is an object to provide a lamp guide.

In order to achieve the object as described above, the present invention is a reflection plate; First to third fluorescent lamps sequentially arranged side by side at a pitch interval on the reflecting plate; And a lamp guide configured with first and second lamp holders for preventing the flow of the first to third fluorescent lamps, wherein the first and second lamp holders of the lamp guide are configured at intervals of two pitches. Thus, the backlight unit for the liquid crystal display device is characterized in that the first and third fluorescent lamps are respectively fixed.

The lamp guide is positioned on one side of the first and third fluorescent lamps, further comprising the fourth fluorescent lamp and the second lamp guide, wherein the second and fourth fluorescent lamps are the second lamp It is characterized by being fixed through the guide.

In addition, the second lamp guide is located on the other side of the second and fourth fluorescent lamps, characterized in that not located on a straight line in the arrangement direction of the lamp guide and the first to fourth fluorescent lamps, The lamp guide is characterized in that it comprises a support, a support and a fixed end.

At this time, the support portion is characterized in that it protrudes higher than the lamp holder, the first and second lamp holder is characterized in that the ring shape of one direction is opened.

In addition, the lamp guide is characterized in that the synthetic resin material of white or silver, and further comprises a diffuser plate and a plurality of optical sheets located on the fluorescent lamp, the fixing end of the lamp guide penetrates through the reflective sheet It is characterized by.

In addition, the present invention and the liquid crystal panel; A plurality of optical sheets provided below the liquid crystal panel; A plurality of optical sheets provided on the lower part of the liquid crystal panel, a reflecting plate provided below the liquid crystal panel, first to third fluorescent lamps sequentially arranged side by side at a pitch interval on the reflecting plate, and a first A backlight unit including a lamp guide configured with a second lamp holder; A support main covering an edge of the liquid crystal panel and the backlight unit; A cover bottom adhered to the rear surface of the reflector; And a top cover covering a front edge of the liquid crystal panel, wherein the lamp guide is configured such that the first and second lamp holders are pitched at a pitch of two pitches to fix the first and third fluorescent lamps. A liquid crystal display module is provided.

At this time, the lamp guide is characterized in that it comprises a support, a support and a fixed end, the fixed end is characterized in that the penetrating through the reflecting plate and the cover bottom.

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

4 is an exploded perspective view schematically illustrating a liquid crystal display module according to an exemplary embodiment of the present invention.

As illustrated, the liquid crystal display module includes a liquid crystal panel 110, a backlight unit 120, a support main 130, a cover bottom 150, and a top cover 140.

The liquid crystal panel 110 is a part that plays a key role in image expression and is composed of first and second substrates 112 and 114 bonded to each other with a liquid crystal layer interposed therebetween. In this case, the gate printed circuit board 118 and the source printed circuit board 119 are connected to each other along the two adjacent edges of the liquid crystal panel 110 via the flexible printed circuit board 116, thereby covering the covertum during the modularization process. It is folded and adhered to the side or the back of 150, and each of them transmits on / off signals of a thin film transistor (not shown) to a plurality of gate lines (not shown) and image signals for each frame to a plurality of data lines (not shown). do.

In addition, the liquid crystal panel 110 and the backlight unit 120 are provided below the liquid crystal panel 110 by the top cover 140 which covers the edges thereof and is coupled to the cover bottom 150. ) Will be fixed integrally.

The backlight unit 120 includes a reflective sheet 122, and arranges a plurality of fluorescent lamps 124 on an upper surface thereof, and a plurality of optical sheets 126 on the fluorescent lamps 124. In addition, the plurality of fluorescent lamps 124 are fixed by a pair of side supports 128 fastened to the cover bottom 150.

In this case, when the interval between the adjacent fluorescent lamps 124 is one pitch, the plurality of fluorescent lamps 124 are arranged side by side while maintaining the same pitch interval.

In addition, the gap between the fluorescent lamp 124 and the optical sheet 126 constituted by a plurality of the optical sheets 126 is prevented from being deflected, and the shaking and damage of the fluorescent lamp 124 due to the impact are also caused. It further includes a plurality of lamp guides 160 that can prevent the possibility.

The plurality of lamp guides 160 are configured such that the plurality of fluorescent lamps 124 emitting light of the backlight unit 120 and the reflective sheet 122 at the bottom maintain a constant distance, thereby maximizing the reflection efficiency, By preventing sagging of the optical sheet 126, a uniform surface light source may be realized by maintaining a predetermined distance with the plurality of fluorescent lamps 124.

In this case, the lamp guide 160 may be made of a synthetic resin having a white color with a high reflection efficiency and a certain elasticity.

In addition, the lamp guide 160 is fixed to the at least two fluorescent lamps 124 at the same time, a plurality of are arranged in a zigzag form on both sides of the fluorescent lamps 124 are arranged side by side.

That is, the plurality of lamp guides 160 are not positioned in line with each other in the arrangement direction of the fluorescent lamps 124. For example, if the first to fourth fluorescent lamps are sequentially arranged side by side on the reflective sheet. At least two lamp guides are required. The first lamp guide is to fix the first and third fluorescent lamps on one side of the fluorescent lamp, the second lamp guide is to fix the second and fourth fluorescent lamps on the other side of the fluorescent lamp.

5a to 5b are a perspective view and a front view schematically showing a lamp guide according to the present invention.

As shown in FIG. 5A, the lamp guide 160 seated on the reflective sheet 122 of FIG. 4 includes a support 162 serving as a main body to support the entire lamp guide 160 in a plate shape, and a support 162. The optical sheet (126 in FIG. 4) is configured to support a part of the optical sheet (126 in FIG. The sagging of the sheet (126 of FIG. 4) is prevented.

In addition, the back of the support 162 is a fixed end 164 is formed through the reflective sheet (122 in FIG. 4) and the cover bottom (150 in FIG. 4) to secure the entire lamp guide 160. At this time, the fixing end 164 protruding downward to the back of the support 162 is at least two or more, as shown in the figure after protruding downward from the back of the support 162 to each other. It shows a ring shape bent into the room, each end may be provided with a hook (hook) and the like.

The fixed end 164 is preferably composed of both sides of the support 162, and corresponds to the fixed end 164 on the reflective sheet (122 in FIG. 4) and the cover bottom (150 in FIG. 4). At least one through hole (123 and 151 of FIG. 4) is configured to allow the fixed end 164 to penetrate the through hole (123 and 151 of FIG. 4). For this reason, the lamp guide 160 is fixed to the reflective sheet (122 in FIG. 4) and the cover bottom (150 in FIG. 4).

In addition, the first and second lamp holders 166a and 166b for preventing the flow of the fluorescent lamp 124 on both sides of the support 162 formed in the lamp guide 160 are configured.

The first and second lamp holders 166a and 166b each have an annular shape surrounding an outer surface of a portion of the fluorescent lamp 124, and an upper portion toward the optical sheet 126 of FIG. 4 is opened to fluoresce through the portion. It is configured to insert and secure the lamp 126.

As shown in FIG. 5B, the first and second lampholders 166a and 166b are spaced apart from each other at different intervals around the support 168 formed on the support 162. The first lampholder 166a is spaced apart from the support 168 by a first interval c, and the second lampholder 166b is spaced apart from the support 168 by a second interval d. Done. In this case, the first interval c may correspond to about three times the second interval d. (c = 3d)

In addition, the second gap d corresponds to one half of the pitch between the fluorescent lamps 124a, 124b, and 124c arranged side by side on the reflective sheet 122 of FIG. (d = 1 pitch / 2)

Accordingly, the first and second lamp holders 166a and 166b are respectively configured in regions corresponding to two pitch intervals of the plurality of fluorescent lamps 124a, 124b and 124c which are arranged side by side at the first pitch interval.

Accordingly, the first and second lamp holders 166a and 166b of the lamp guide 160 are arranged among the first to third fluorescent lamps 124a, 124b and 124c that are sequentially arranged side by side at a pitch interval. The first fluorescent lamp 124a and the third fluorescent lamp 124c are fixed, respectively.

In this case, the second fluorescent lamp 124b is not positioned in line with the lamp guide 160 which fixes the first and third fluorescent lamps 124a and 124c together with the fourth fluorescent lamp (not shown). It is fixed by another lamp guide (not shown) located on the other side thereof.

Accordingly, when using the lamp guide 160 according to the present invention, the first and third fluorescent lamps 124a and 124c are inserted into the lamp holders 166a and 166b, and the lamp holder of another lamp guide (not shown). By inserting the second fluorescent lamp 124b and the fourth fluorescent lamp (not shown) in (not shown) to maintain a constant distance from the reflective sheet (122 in Figure 4), the reflection efficiency can be increased, the fluorescent lamp by impact The possibility of shaking or breaking of the 124a, 124b, and 124c can be greatly reduced. In addition, by supporting the optical sheet 126 of FIG. 4 by the supporting unit 168, it is possible to prevent the deflection caused by the self-load and maintain a constant distance from the fluorescent lamp 124.

As shown in FIG. 6, it can be seen that the circular shape unevenness (e) due to the obstruction of the light emitting area of the fluorescent lamp 124 by the lamp guide 160 is significantly smaller than before. For this reason, since the shape of the unevenness | emission (e) is confirmed insignificantly in the whole image, brightness becomes more uniform.

At this time, the specific shape of the lamp holder (166a, 166b of Figure 5a) can be modified as much as possible, in particular, the shape of the support portion (168 of Figure 5a), including the fixed end (164 of Figure 5a) varies as desired Can be changed.

As described above, as described above, the present invention by preventing the deflection of the optical sheet, by controlling the distance between the optical sheet and the fluorescent lamp uniformly within the desired range to realize a uniform surface light source There is an effect that can greatly reduce the possibility of shaking or breakage of the fluorescent lamp by an external impact.

In addition, there is an effect that can realize a more uniform and high brightness by minimizing the unevenness by the obstruction of the fluorescent lamp.

Claims (13)

A reflector; First to third fluorescent lamps sequentially arranged side by side at a pitch interval on the reflecting plate; Lamp guide configured with first and second lamp holder to prevent the flow of the first to third fluorescent lamps And the first and second lamp holders of the lamp guide are arranged at intervals of two pitches to fix the first and third fluorescent lamps, respectively. The method of claim 1, The lamp guide is a backlight unit for a liquid crystal display device, characterized in that located on one side of the first and third fluorescent lamps. The method of claim 1, And a fourth fluorescent lamp and a second lamp guide, wherein the second and fourth fluorescent lamps are fixed through the second lamp guide. The method of claim 3, wherein The second lamp guide is located on the other side of the second and fourth fluorescent lamps, the liquid crystal display device, characterized in that not located in a straight line in the arrangement direction of the lamp guide and the first to fourth fluorescent lamps. Backlight unit. The method of claim 1, The lamp guide is a backlight unit for a liquid crystal display device comprising a support, a support and a fixed end. The method of claim 5, wherein And the support portion protrudes upwardly higher than the lamp holder. The method of claim 1, And the first and second lamp holders have an annular shape in which one direction is open. The method of claim 1, The lamp guide is a backlight unit for a liquid crystal display device, characterized in that the white or silver synthetic resin material. The method of claim 1, A backlight unit for a liquid crystal display device further comprising a diffusion plate and a plurality of optical sheets positioned on the fluorescent lamp. The method of claim 5, wherein And a fixing end of the lamp guide penetrates the reflective sheet. A liquid crystal panel; A plurality of optical sheets provided below the liquid crystal panel; A plurality of optical sheets provided on the lower part of the liquid crystal panel, a reflecting plate provided below the liquid crystal panel, first to third fluorescent lamps sequentially arranged side by side at a pitch interval on the reflecting plate, and a first A backlight unit including a lamp guide configured with a second lamp holder; A support main covering an edge of the liquid crystal panel and the backlight unit; A cover bottom adhered to the rear surface of the reflector; Top cover covering the front edge of the liquid crystal panel Wherein the lamp guide is configured such that the first and second lamp holders are pitched at two pitch intervals to fix the first and third fluorescent lamps. The method of claim 11, The lamp guide includes a support, a support, and a fixed end. The method of claim 12, And the fixed end penetrates the reflective plate and the cover bottom.
KR1020070015265A 2007-02-14 2007-02-14 Backlight unit for liquid crystal display device KR20080075976A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103090277A (en) * 2013-01-30 2013-05-08 深圳市华星光电技术有限公司 Backlight module and liquid crystal display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103090277A (en) * 2013-01-30 2013-05-08 深圳市华星光电技术有限公司 Backlight module and liquid crystal display device

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