CN101750768B - Liquid crystal display device - Google Patents
Liquid crystal display device Download PDFInfo
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- CN101750768B CN101750768B CN2009101745082A CN200910174508A CN101750768B CN 101750768 B CN101750768 B CN 101750768B CN 2009101745082 A CN2009101745082 A CN 2009101745082A CN 200910174508 A CN200910174508 A CN 200910174508A CN 101750768 B CN101750768 B CN 101750768B
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- 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
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- 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
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- 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
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- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Planar Illumination Modules (AREA)
Abstract
An LCD device is disclosed. The LCD device is configured to include a plurality of insulation films between a balancely printed circuit board and a bottom cover and to form a plurality of air layers between the plurality of insulation films. Accordingly, noise caused by vibrations from electric currents flowing through lamps can be minimized.
Description
The application requires to here cite its full content as a reference in the rights and interests of the korean patent application No.10-2008-0130283 of submission on Dec 19th, 2008.
Technical field
The disclosure relates to a kind of liquid crystal display, relates in particular to a kind of liquid crystal display that is fit to minimize by the caused noise of vibration of the electric current of flowing through lamps.
Background technology
Along with the progress of information age, visually show in a large number based on the display device of the data of electric signal just fast-developing.Therefore, have light such as amount, matter thin and the flat panel display equipment of the superior characteristics of low electric energy consumption extensively distributes.Flat panel display equipment comprises that liquid crystal display (LCD) equipment, Plasma Display (PDP) equipment, FED (FED) equipment, electroluminescence show (ELD) equipment or the like.Flat panel display equipment replaces these cathode-ray tube (CRT)s of prior art just fast.
Because LCD equipment itself can not be luminous, therefore in order to form image (or picture), LCD equipment must receive light to form image (or picture).In other words, LCD equipment is light-receiving type display device.Therefore, LCD equipment must comprise independent light source, for example, and back light unit.According to the position of fluorescent light, the back light unit that uses in the LCD equipment can be divided into full run-down type or peripheral type.The Staight downward type backlight unit comprises a plurality of fluorescent lights on the flat board that is arranged in below the display panels, and the peripheral type back light unit comprises the fluorescent light on the lateral parts that is arranged on LGP.
More particularly, the peripheral type back light unit comprises the LGP and the lamp part that is arranged on a side surface of LGP of direct light.Lamp partly comprises alight, install to hold and the lamp socket at the two ends of guard lamp and the reflecting plate that surrounds the peripheral surface of lamp.One side surface of reflecting plate is inserted in the side surface of LGP.Reflecting plate reflects the light that lamp sends to LGP.This peripheral type back light unit mainly is used in the less LCD equipment of size, and this LCD equipment is applied to the display screen of notebook computer and desktop computer.The peripheral type back light unit has the long life-span of even light distribution and inner body, and allows LCD equipment thinner.
Along with the increase of LCD equipment, the development of Staight downward type backlight unit begins.The Staight downward type backlight unit comprises a plurality of lamps that are arranged in below the scatter plate, so that light is shone directly on the whole surface of liquid crystal panel.Like this, the Staight downward type backlight unit has higher luminescence efficiency than peripheral type back light unit.Consider this point, the Staight downward type backlight unit mainly is used in the large-sized LCD equipment that needs high-level brightness.Simultaneously, the Staight downward type backlight unit comprises a lot of lamps.The large scale display screen or the TV that comprise the LCD equipment with Staight downward type backlight unit have the life-span longer than notebook computer.Owing to these reasons, the Staight downward type backlight unit breaks down than peripheral type back light unit more frequently, and because the end in the life-span of lamp, the part lamp is higher with inoperative possibility.
In fact, the Staight downward type backlight unit that is applied to LCD equipment comprises: be arranged in the interior a plurality of fluorescent lights in inner space (or cavity) that formed by framework up and down; Be arranged on below a plurality of fluorescent lights and catoptrical reflecting plate; And be arranged on a plurality of fluorescent lights top and scattering and assemble optical sheet from the light of a plurality of fluorescent lights.A plurality of fluorescent lights are inserted in the fixed component on the balance printed circuit board (B-PCB), and are placed in the bottom.B-PCB and bottom are through being formed on insulation course between them and insulated from each other.
Produce the light time when a plurality of fluorescent lights use separately the electric current corresponding to the driving voltage of lamp, cause vibration by the electric current of the fluorescent light of flowing through.This vibration is delivered to B-PCB.By insulation course vibration is reduced to the mode of very little intensity with this, the vibration of being transmitted arrives bottom.
But, along with LCD equipment made gradually thinner, the thickness of insulation course reduces.Like this, the distance between B-PCB and the bottom reduces.In addition, the distance between a plurality of fluorescent lights and the B-PCB also reduces.Owing to these reasons, to compare with the vibration of prior art, the vibration that is caused by the electric current of a plurality of fluorescent lights of flowing through has been strengthened greatly.So, possibly on the whole surface of bottom, produce noise.
Summary of the invention
Therefore, present embodiment relates to the LCD equipment of one or more problems that a kind of restriction and shortcoming that overcomes basically by prior art cause.
The purpose of present embodiment provides a kind of LCD equipment; Comprise being formed on a plurality of insulation courses between B-PCB and the bottom and being formed on the air layer between B-PCB, a plurality of insulation course and the bottom, so energy minimization is by the caused noise of the vibration of the electric current of a plurality of fluorescent lights of flowing through.
Other characteristics and the advantage of embodiment will be set forth in the following description, and the part of these characteristics and advantage will be conspicuous from the following description, perhaps can from the practice of embodiment, learn.To realize or obtain the advantage of embodiment through the structure that in explanatory note book and claim and accompanying drawing, particularly points out.
According to one of present embodiment overall aspect, LCD equipment comprises: liquid crystal panel; Back light unit comprises a plurality of lamps on the back side that is arranged in said liquid crystal panel, comprises that also the light that said a plurality of lamps are sent offers a plurality of optical sheets of said liquid crystal panel; Bottom holds said liquid crystal panel and said back light unit; First and second balance printed circuit board, each is arranged on said the bottom inboard left side and edge, the right, and each all comprises the lamp socket at the two ends that hold a plurality of lamps; First dielectric film; Second dielectric film; Be arranged between said bottom and said first and second balance printed circuit board; Said first dielectric film is arranged between said first and second balance printed circuit board and said second dielectric film, and wherein at least two air layers are formed between said balance printed circuit board and said second dielectric film.
LCD equipment according to another aspect of present embodiment comprises: liquid crystal panel; Back light unit comprises a plurality of lamps that are arranged on the said liquid crystal panel back side, comprises that also the light that said a plurality of lamps are sent offers a plurality of optical sheets of said liquid crystal panel; Bottom holds said liquid crystal panel and said back light unit; First and second balance printed circuit board, each is arranged on said the bottom inboard left side and edge, the right, and each all comprises the lamp socket at the two ends that hold a plurality of lamps; The reflecting plate of sound-proof material is arranged on the inboard of said bottom, and the light reflection that said a plurality of lamps are sent is to said optical sheet; And dielectric film; Be arranged between said bottom and said first and second balance printed circuit board; And in the face of said first and second balance printed circuit board form, wherein at least two first air layers are formed between said first and second balance printed circuit board and the said reflecting plate.
According to the check of figs and detailed description, other system, method, feature and advantage will be to those skilled in the art or will become obvious.Be intended to make all these additional system, method, feature and advantage to be included in this descriptions, within the scope of the invention, and protect by claims subsequently.Have no content should be considered to be restriction in this part to those claims.Below in conjunction with each further aspect of embodiment discussion and advantage.It all is exemplary with indicative that the generality that should be appreciated that front of the present disclosure is described detailed description with the back, is intended to provide to further explanation of the present disclosure required for protection.
Description of drawings
The accompanying drawing that is comprised is used to provide the further explanation to embodiment, and introduce to form the application's a part, the accompanying drawing diagram embodiments of the invention, and be used to explain the disclosure with instructions.In the accompanying drawings:
Fig. 1 is the decomposition diagram according to the LCD equipment of the disclosure first embodiment;
Fig. 2 is the sectional view of adjustment state of the LCD equipment of key diagram 1;
Fig. 3 is the sectional view of the state that sequentially piled up of a B-PCB and first and second dielectric films in the key diagram 2;
Fig. 4 A is the view that specifies first and first dielectric film shown in Fig. 3;
Fig. 4 B is the sectional view along I～I ' extraction of Fig. 4 A;
Fig. 5 is the sectional view of explanation according to the LCD equipment of the disclosure second embodiment;
Fig. 6 is the sectional view of the state that sequentially piled up of a B-PCB, dielectric film and the reflecting plate in the key diagram 5;
Fig. 7 is a tables of data of measuring the vibration that in the LCD equipment according to the LCD equipment of embodiment of the present disclosure and prior art, produces.
Embodiment
To describe in detail with reference to embodiment of the present disclosure now, in the accompanying drawing diagram example.For its spirit is conveyed to those of ordinary skills, these embodiments of introducing hereinafter will provide as an example.Therefore, these embodiment can implement with different forms, thereby are not limited to described these embodiment here.In addition, in the accompanying drawings for convenience's sake, the size of indication equipment spare and thickness large.If possible, in comprising whole the disclosing of accompanying drawing, will use identical mark to represent same or analogous parts.
Fig. 1 is the decomposition diagram according to the LCD equipment of the disclosure first embodiment.With reference to Fig. 1, comprise according to the LCD equipment of the disclosure first embodiment: liquid crystal panel 110 and first and second printed circuit board (PCB)s (PCB) 111a and 111b.Liquid crystal panel 110 comprises upper substrate, infrabasal plate and the liquid crystal layer between them.On upper and lower base plate, the electrode that is used to produce electric field forms against each other.The one PCB 111a and the 2nd PCB 111b are connected to liquid crystal panel 110, and apply sweep signal and data-signal for the gate line and the data line that are formed on the infrabasal plate.On the one PCB (111a) gate drivers that is used for providing sweep signal to gate line is installed.On the 2nd PCB (111b) data driver that is used for providing data to data line is installed.
LCD equipment also comprises on the back side that is arranged on liquid crystal panel 110, the back light unit 120 of light is provided for liquid crystal panel 110.Back light unit 120 is a full run-down type.Like this, back light unit 120 comprises a plurality of lamps 122 and a plurality of optical sheets 114.Lamp 122 is with the parallel layout of fixed distance.Optical sheet 114 piles up above lamp 122, and the light that sends of broad light 122, has therefore improved the visual angle.
This LCD equipment can be turned to guide panel 112, bottom 126, overhead guard (top case) 140 and a plurality of combination member (not shown) by module.Guide panel 112 has around the rectangular shaped rim shape at the edge of liquid crystal panel 110 and back light unit 120.Bottom 126 supports the side surface and the back side of back light unit 120.Overhead guard 140 with around liquid crystal panel 110 preceding (on) the rectangular shaped rim shape at the edge on surface forms, and combines with guide panel 112.A plurality of combination members combine guide panel 112, bottom 126, overhead guard 140.
For the combined structure of the lamp 122 in the back light unit 120 is described, an end of a plurality of lamps 122 is fixed to first balance printed circuit board (B-PCB) 124a, and the other end of a plurality of lamps 122 is fixed to second balance printed circuit board (B-PCB) 124b.Each of the one B-PCB 124a and the 2nd B-PCB 124b is all covered by support edge (support sider) 116.Support edge 116 combines with the both sides of the edge of the bottom 126 of the back side of supporting back light unit 120 and side surface respectively.Reflecting plate 132 is arranged on the inboard of bottom.The light that a plurality of lamps 122 of reflecting plate 132 reflections send, and the light that will reflect offers a plurality of optical sheets 114.In addition, the 3rd PCB (not shown) is arranged on the back side of bottom 126.The 3rd PCB comprises the inverter (not shown) that applies lamp driving voltage to a plurality of lamps 122.
Each of the one B-PCB 124a and the 2nd B-PCB 124b all comprises lamp socket 134.Each longitudinal direction along a B-PCB 124a and the 2nd B-PCB 124b becomes an arranged lamp socket 134, and through welding lamp socket 134 is fixed to a B-PCB 124a and the 2nd B-PCB 124b.The two ends of each lamp 122 all are inserted in the lamp socket 134.
In the face of a B-PCB 124a and the 2nd B-PCB124b on a left side/right side edge that is arranged on bottom 126 install first dielectric film 128 and second dielectric film 130.First dielectric film 128 and second dielectric film 130 pile up between bottom 126 and a B-PCB 124a and the 2nd B-PCB 124b, form stack layer.In other words, first dielectric film 128 is between the first B-PCB 124a and the 2nd B-PCB 124b and second dielectric film 130, and second dielectric film 130 is between first dielectric film 128 and bottom 126.In addition, first dielectric film 128 and second dielectric film 130 are formed by the material that comprises polyethylene terephthalate (PET) or polycarbonate (PC).
More particularly, first dielectric film 128 comprises first left side dielectric film 128a and first the right dielectric film 128b, and second dielectric film 130 comprises second left side dielectric film 130a and second the right dielectric film 130b.First left side dielectric film 128a is between the first B-PCB 124a and second left side dielectric film 130a, and first the right dielectric film 128b is between the second B-PCB 124b and second the right dielectric film 130b.Second left side dielectric film 130a is between first left side dielectric film 128a and bottom 126, and second the right dielectric film 130b is between first the right dielectric film 128b and bottom 126.
Fig. 2 is the sectional view of adjustment state of the LCD equipment of key diagram 1, and Fig. 3 is the sectional view of the state that sequentially piled up of a B-PCB and first and second dielectric films in the key diagram 2.Shown in Fig. 1-3, bottom 126 holds back light unit (120 among Fig. 1) and comprises the upper substrate 101 of combination and the liquid crystal panel 110 of infrabasal plate 103.Gate line and data line on the infrabasal plate 103 of liquid crystal panel 110 cross one another, and limit pixel region.Thin film transistor (TFT) TFT (not shown) is respectively formed in the pixel region.In the face of the color filter of pixel region on upper substrate 101 sequentially, repeatedly form.The polarization plates (not shown) is sticked to the outside surface of upper substrate 101 and infrabasal plate 103.
Therefore, second dielectric film 130 is positioned on the bottom 126, and first dielectric film 128 is positioned on second dielectric film 130, and a B-PCB 124a and the 2nd B-PCB 124b are positioned on first dielectric film 128.Like this, between a B-PCB 124a and the 2nd B-PCB 124b and first dielectric film 128, between first dielectric film 128 and second dielectric film 130 and form air layer between second dielectric film 130 and the bottom 126, i.e. first air layer.In other words, between a B-PCB 124a and bottom 126, form at least two air layers, between the 2nd B-PCB 124b and bottom 126, also form at least two air layers.
The electric current of the lamp 122 on flow through a B-PCB 124a and the 2nd B-PCB 124b produces vibration; And when giving a B-PCB 124a and the 2nd B-PCB 124b with this transfer of vibration, air layer absorbs the partial vibration that passes to a B-PCB 124a and the 2nd B-PCB 124b.Therefore, weakened the vibration that arrives bottom 126 greatly.
In other words; At least two dielectric films 128 and 130 that between B-PCB 124 and bottom 126, are provided with can make at least two air layers form, and therefore partly this air layer absorption between dielectric film 128 and 130 passes to the vibration of bottom 126 via B-PCB 124 and first dielectric film 128 and second dielectric film 130 from lamp 122.Weakened the vibration that passes to bottom 126 from lamp 122 like this, greatly.
Adopt this mode, comprise at least two dielectric films 128 and 130 that are formed between B-PCB 124 and the bottom 126 according to the LCD equipment of the disclosure first embodiment, and allow to provide at least two air layers.This air layer is absorbed in the vibration that produces in the lamp 122.Therefore, weakened the vibration that passes to bottom 126 greatly.
First dielectric film 128 and second dielectric film 130 can be by forming such as in multiple sound insulation (or foam) material of urethane foam, cellular polyurethane (poron) and PSR any one, thereby absorb the caused vibration of electric current (or pipe stream) by flowing through lamps.Weakened amplitude like this, greatly by the caused vibration of electric current (or pipe stream) of flowing through lamps 122.
Shown in Fig. 4 A and 4B; Because sound insulation (or foam) material 160 such as urethane foam, cellular polyurethane or PSR burns easily; Therefore first dielectric film 128 and second dielectric film 130 can also comprise having V0 safety standard grade, and nonflammable, the insulating fabrics 162 of encirclement sound insulation (or foam) material 160.Insulating fabrics can be bonding through bonding agent 161 and sound-proof material.
Can give insulating fabrics 162 coated with resins layer 162a as required.Resin bed 162a forms through the PU coating processes.This PU coating processes is for applying molten resin material, using the roller multiple patterned 162b of imprinting and the material dry and sclerosis institute coating zone on the resin material of coating that have patterned on the insulating fabrics 162.The insulating fabrics that is coated with resin bed through the PU coating processes becomes harder, therefore improves its processing and handling properties biglyyer.
Like this first dielectric film 128 and second dielectric film 130 that comprise sound insulation (or foam) material that is insulated the fabric encirclement have high dielectric intensity; And absorb the caused vibration of electric current (or pipe stream) by a plurality of lamps 122 of flowing through, protecting component is avoided external impact simultaneously.
Fig. 5 is the sectional view of explanation according to the LCD equipment of the disclosure second embodiment.Fig. 6 is the sectional view of the state that sequentially piled up of a B-PCB, dielectric film and the reflecting plate in the key diagram 5.Has the essentially identical structure of LCD equipment with above-described first embodiment according to the LCD equipment of the disclosure second embodiment.Like this, the basic structure according to the LCD equipment of the disclosure second embodiment will be omitted.
As shown in Figure 5, comprise reflecting plate 232 and a B-PCB 124a and the 2nd B-PCB 124b of the left and right edges that each all is arranged on reflecting plate 232 of sound insulation (or foam) material of the inside surface that is arranged on bottom 126 according to the LCD equipment of the disclosure second embodiment.The reflecting plate 232 of sound insulation (or foam) material can be formed by UXZ1.Reflecting plate 232 is used for effectively the inboard of light scattering at LCD equipment, but reflecting plate can form through foam process.Like this, reflecting plate 232 can also be realized the effect of sound absorption.
LCD equipment also comprises the left side dielectric film 228a of sound insulation (or foam) material that is arranged between a B-PCB 124a and the reflecting plate 232 and the right dielectric film 228b that is arranged on sound insulation (or foam) material between the 2nd B-PCB 124b and the reflecting plate 232.Dielectric film 228 (that is, left side dielectric film 228a and the right dielectric film 228b) can be formed by in polyethylene terephthalate (PET) or the polycarbonate (PC) any one.Alternatively, dielectric film 228 can be formed by above-described sound insulation such as urethane foam, cellular polyurethane or PSR (or foam) material.In this case, owing to burn easily, therefore can surround dielectric film 228 by nonflammable, insulating fabrics with V0 safety standard grade such as sound insulation (or foam) material of urethane foam, cellular polyurethane or PSR.Insulating fabrics can be bonding through bonding agent and sound-proof material.The dielectric film 228 that comprises sound insulation (or foam) material that is insulated the fabric encirclement like this has high dielectric intensity, and absorbs the caused vibration of electric current (or pipe stream) by a plurality of lamps 122 of flowing through, and protecting component is avoided external impact simultaneously.
In other words; The reflecting plate 232 of sound insulation (or foam) material is set on the inside surface of bottom 126; On reflecting plate, form dielectric film 228 (promptly; Left side dielectric film 228a and the right dielectric film 228b), and on dielectric film 228 (more particularly, left side dielectric film 228a and the right dielectric film 228b), a B-PCB 124a and the 2nd B-PCB 124b are set.As shown in Figure 6; The structure of piling up allows at a B-PCB 124a and the 2nd B-PCB 124b and dielectric film 228 (promptly; Left side dielectric film 228a and the right dielectric film 228b) between form an air layer, also allow another air layer of formation between the reflecting plate 232 of dielectric film 228 and sound insulation (or foam) material.In addition, can also between the reflecting plate 232 of sound insulation (or foam) material and bottom 126, form another air layer.
A plurality of layers structure being provided with between B- PCB 124a and 124b and the bottom 126 produces air layer between B-PCB 124a and 124b and bottom 126, thereby air layer is absorbed by the caused partial vibration of the electric current of flowing through lamps 122.Weakened the vibration that passes to bottom 126 through B-PCB 124a and 124b like this, greatly.In addition, because reflecting plate 232 absorbs by the caused partial vibration of the electric current of flowing through lamps 122, therefore weakened the more vibration that passes to bottom 126 through B-PCB 124a and 124b.
Fig. 7 is a tables of data of measuring the vibration that in the LCD equipment according to the LCD equipment of embodiment of the present disclosure and prior art, produces.That describes among Fig. 7 is data represented when when varying level applies driving voltage, from according to 5 times are measured the LCD equipment of the disclosure first and second embodiment and prior art noise level (or value) (dB).
The driving voltage that imposes on lamp be " 0V ", dutycycle be 30% first the experiment in; The level of noise of from the LCD equipment of prior art, measuring is 23.0dB; And the level of noise of from the LCD equipment of first embodiment, measuring is 18.1dB, and the level of noise of from the LCD equipment of second embodiment, measuring is 17.8dB.With the LCD apparatus in comparison of prior art, the LCD equipment of first embodiment reduces about 4.9dB with noise content, and with the LCD apparatus in comparison of prior art, the LCD equipment of second embodiment reduces about 5.2dB with noise content.
With reference to the 5th noise data that is 0V when the driving voltage that imposes on lamp 122, measures when dutycycle is 30%; The noise that the LCD equipment of prior art produces is about 23.0dB; And the noise that the LCD equipment of first embodiment produces is about 18.2dB, and the noise that the LCD equipment of second embodiment produces is about 17.1dB.In other words, with the LCD apparatus in comparison of prior art, the LCD equipment of first embodiment reduces about 4.8dB with noise content, and the LCD equipment of second embodiment reduces about 5.9dB with noise content.
The driving voltage that imposes on lamp be " 1.65V ", dutycycle be 70% first the experiment in; Be about 19.4dB from the level of noise of the LCD device measuring of prior art; And the level of noise of from the LCD equipment of first embodiment, measuring is about 18.5dB, and the level of noise of from the LCD equipment of second embodiment, measuring is about 17.0dB.Therefore, with the LCD apparatus in comparison of prior art, the LCD equipment of first embodiment reduces about 0.9dB with noise content, and with the LCD apparatus in comparison of prior art, the LCD equipment of second embodiment reduces about 2.4dB with noise content.
The 5th noise data as being 1.65V when the driving voltage that imposes on lamp 122, measuring when dutycycle is 70% seen; The noise that the LCD equipment of prior art produces is about 20.7dB; And the noise that the LCD equipment of first embodiment produces is about 18.8dB, and the noise that the LCD equipment of second embodiment produces is about 17.1dB.In other words, with the LCD apparatus in comparison of prior art, the LCD equipment of first embodiment reduces about 1.9dB with noise content, and the LCD equipment of second embodiment reduces about 3.6dB with noise content.
The LCD apparatus in comparison of these data measured proofs and prior art, the LCD equipment of first and second embodiment has reduced noise content.Noise content is represented as base unit by " dB ", and is calculated by equation 1.
[equation 1]
dB＝10logx
Compare the level of noise that equation 1 obtains, 20dB is bigger 10 times than 10dB, and is bigger 100 times than 1dB.In addition, 30dB is bigger 10 times than 20dB, and is bigger 1000 times than 1dB.In addition, the sound of 100dB is than loud 10,000,000,000 times of 1dB.In fact, if sound expands 1dB to from 0dB, the size of people's perceived sounds becomes at least and is twice, and perhaps more precisely, is to have increased 1.26 times.
As the data that record, with the LCD apparatus in comparison of prior art, the LCD equipment of first and second embodiment has reduced 0.9dB at least with noise.So, being different from the LCD equipment of prior art, the LCD equipment energy minimization of first and second embodiment is by the noise that vibration causes of the electric current of flowing through lamps.
As stated, between bottom and B-PCB, comprise the reflecting plate of at least two dielectric films or dielectric film and sound insulation (or foam) material according to the LCD equipment of embodiment of the present disclosure.Therefore, LCD equipment can weaken the noise that vibration causes (dB) by the electric current of flowing through lamps greatly.
In addition, although, can both absorb by the caused partial vibration of the electric current of flowing through lamps according to each included dielectric film of the LCD equipment of the disclosure first and second embodiment because the thinning of LCD equipment reduces the distance between a plurality of lamps and the B-PCB.Like this, the LCD equipment of first and second embodiment can reduce the noise that caused by vibration.
Although only explained the disclosure limitedly to the foregoing description; But those of ordinary skills are to be understood that; The disclosure is not limited to these embodiment, but is interpreted as under the situation that does not break away from spirit of the present disclosure, and various variations or modification are possible.Therefore, the scope of the present disclosure should only be confirmed by accompanying claims and equivalent thereof.
Claims (10)
1. liquid crystal display comprises:
Liquid crystal panel;
Back light unit comprises a plurality of lamps on the back side that is arranged in said liquid crystal panel, comprises that also the light that said a plurality of lamps are sent offers a plurality of optical sheets of said liquid crystal panel;
Bottom holds said liquid crystal panel and said back light unit;
First and second balance printed circuit board, each is arranged on said the bottom inboard left side and edge, the right, and each all comprises the lamp socket at the two ends that hold said a plurality of lamps;
Be separately positioned on first dielectric film of said first and second balance printed circuit board below;
Be separately positioned on second dielectric film between said bottom and said first dielectric film,
Be separately positioned on first air layer between said first dielectric film and said first and second balance printed circuit board;
Be arranged on second air layer between said first dielectric film and said second dielectric film;
Be separately positioned on the 3rd air layer between said second dielectric film and the said bottom.
2. liquid crystal display according to claim 1 also is included in the reflection horizon between said a plurality of lamp and the said bottom.
3. liquid crystal display according to claim 1, wherein said first dielectric film and said second dielectric film contain polyethylene terephthalate (PET) or polycarbonate (PC).
4. liquid crystal display according to claim 1, wherein said first dielectric film and said second dielectric film comprise sound-proof material.
5. liquid crystal display according to claim 4, wherein said first dielectric film and said second dielectric film also comprise fabric nonflammable and insulation.
6. liquid crystal display according to claim 5, wherein said first dielectric film and said second dielectric film also comprise the resin with patterned, and this resin is applied on the said fabric.
7. liquid crystal display comprises:
Liquid crystal panel;
Back light unit comprises a plurality of lamps that are arranged on the said liquid crystal panel back side, comprises that also the light that said a plurality of lamps are sent offers a plurality of optical sheets of said liquid crystal panel;
Bottom holds said liquid crystal panel and said back light unit;
First and second balance printed circuit board, each is arranged on said the bottom inboard left side and edge, the right, and each all comprises the lamp socket at the two ends that hold said a plurality of lamps;
The reflecting plate of sound-proof material is arranged on the inside surface of said bottom, and the light that said a plurality of lamps send is reflected to said optical sheet;
Dielectric film is arranged between said bottom and said first and second balance printed circuit board, and said relatively first and second balance printed circuit board and forming,
Wherein at least two air layers are formed between said first and second balance printed circuit board and the said reflecting plate,
Wherein said at least two air layers comprise first air layer that is separately positioned between said first and second balance printed circuit board and the said dielectric film; Be arranged on second air layer between said dielectric film and the said reflecting plate, and be arranged on the 3rd air layer between said reflecting plate and the said bottom.
8. liquid crystal display according to claim 7, wherein said dielectric film contain polyethylene terephthalate (PET) or polycarbonate (PC).
9. liquid crystal display according to claim 7, wherein said dielectric film comprises sound-proof material.
10. liquid crystal display according to claim 9, wherein said dielectric film comprise the fabric that is arranged on the nonflammable and insulation on the said sound-proof material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20080130283 | 2008-12-19 | ||
| KR10-2008-0130283 | 2008-12-19 |
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| Publication Number | Publication Date |
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| CN101750768A CN101750768A (en) | 2010-06-23 |
| CN101750768B true CN101750768B (en) | 2012-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101745082A Active CN101750768B (en) | 2008-12-19 | 2009-09-28 | Liquid crystal display device |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR101578217B1 (en) |
| CN (1) | CN101750768B (en) |
| TW (1) | TWI405000B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8851695B2 (en) | 2010-10-27 | 2014-10-07 | Lg Electronics Inc. | Display apparatus |
| CN103325325A (en) * | 2013-05-28 | 2013-09-25 | 黄绮凡 | Energy-saving advertising lamp box module and energy-saving advertising lamp box |
| US10502992B2 (en) * | 2016-07-29 | 2019-12-10 | Lg Display Co., Ltd. | Liquid crystal display device |
| KR20180057942A (en) | 2016-11-23 | 2018-05-31 | 엘지디스플레이 주식회사 | Liquid crystal display device |
| KR101919454B1 (en) * | 2017-07-31 | 2018-11-16 | 엘지디스플레이 주식회사 | Display apparatus and computing apparatus |
| KR20220053835A (en) * | 2020-10-23 | 2022-05-02 | 엘지디스플레이 주식회사 | Display apparatus |
| KR20240045904A (en) * | 2022-09-30 | 2024-04-08 | 삼성전자주식회사 | Display apparutus |
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| CN1609673A (en) * | 2003-10-16 | 2005-04-27 | Nec液晶技术株式会社 | Liquid crystal display panel |
| CN1621920A (en) * | 2003-11-29 | 2005-06-01 | 株式会社Lstech | Flat fluorescent lamp and backlight unit using the same |
| CN1727943A (en) * | 2004-07-30 | 2006-02-01 | 株式会社日立显示器 | Liquid crystal display device |
| CN101131507A (en) * | 2006-08-21 | 2008-02-27 | 三星电子株式会社 | Backlight assembly and liquid crystal display apparatus having the same |
| JP2008292624A (en) * | 2007-05-23 | 2008-12-04 | Funai Electric Co Ltd | Liquid crystal module |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5958556A (en) * | 1996-12-19 | 1999-09-28 | Minnesota Mining And Manufacturing Company | Vibration damped and stiffened circuit articles |
| KR20060058554A (en) * | 2004-11-25 | 2006-05-30 | 삼성전자주식회사 | Back light assembly and liquid crystal display apparatus having the same |
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2009
- 2009-09-23 KR KR1020090090202A patent/KR101578217B1/en active IP Right Grant
- 2009-09-28 CN CN2009101745082A patent/CN101750768B/en active Active
- 2009-12-11 TW TW098142604A patent/TWI405000B/en active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1609673A (en) * | 2003-10-16 | 2005-04-27 | Nec液晶技术株式会社 | Liquid crystal display panel |
| CN1621920A (en) * | 2003-11-29 | 2005-06-01 | 株式会社Lstech | Flat fluorescent lamp and backlight unit using the same |
| CN1727943A (en) * | 2004-07-30 | 2006-02-01 | 株式会社日立显示器 | Liquid crystal display device |
| CN101131507A (en) * | 2006-08-21 | 2008-02-27 | 三星电子株式会社 | Backlight assembly and liquid crystal display apparatus having the same |
| JP2008292624A (en) * | 2007-05-23 | 2008-12-04 | Funai Electric Co Ltd | Liquid crystal module |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20100071892A (en) | 2010-06-29 |
| KR101578217B1 (en) | 2015-12-18 |
| CN101750768A (en) | 2010-06-23 |
| TWI405000B (en) | 2013-08-11 |
| TW201024848A (en) | 2010-07-01 |
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