CN101634413A - Illumination unit and liquid crystal display device - Google Patents
Illumination unit and liquid crystal display device Download PDFInfo
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- CN101634413A CN101634413A CN200910139831A CN200910139831A CN101634413A CN 101634413 A CN101634413 A CN 101634413A CN 200910139831 A CN200910139831 A CN 200910139831A CN 200910139831 A CN200910139831 A CN 200910139831A CN 101634413 A CN101634413 A CN 101634413A
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Abstract
The invention relates to an illumination unit includes a light guide having an incidence surface, a frame which is spaced apart from the incidence surface of the light guide, an accommodation section which is formed between the incidence surface of the light guide and the frame, and a light source unit including light-emitting diodes, a film substrate on which the light-emitting diodes are amounted, a heat radiation member having a support portion which supports the film substrate and a reflection portion which extends from the support portion, and an adhesive tape which adheres the film substrate to the support portion and has heat radiation properties, the light source unit being accommodated in the accommodation section. The invention also relates to a liquid crystal display device.
Description
Background technology
The present invention relates to lighting unit and comprise the liquid crystal indicator of this lighting unit.
Technical field
Liquid crystal indicator utilizes the advantage that it is in light weight, thickness is little and low in energy consumption, as such as the display unit of OA equipment such as personal computer and television receiver and be used to various fields.In recent years, liquid crystal indicator also is used as the display unit such as portable terminals such as mobile phone, automobile navigation apparatus and game machine.
As this liquid crystal indicator, developed by reflect ambient light optionally come display image the reflection-type module, backlightly come the transmission-type module of display image and have the reflection-type module and the Semitransmissive module of both functions of transmission-type module by optionally seeing through.
Lighting unit (being backlight) on the dorsal part that transmissive liquid crystal display device is configured to comprise the transmission-type liquid crystal display floater and be arranged on this display panels.In recent years, light emitting diode (LED) has been committed to practicality as the lighting unit of light source, with as the above-mentioned lighting unit that is installed in the liquid crystal indicator.
For example, patent documentation 1 (the open patent 2003-76287 of Japan communique) has disclosed following back lighting device, wherein, a plurality of semiconductor light-emitting elements (LED, be light emitting diode) be installed on the surface of film substrate with string mode, each semiconductor light-emitting elements has the light-emitting area that is basically perpendicular to its installed surface.With a surface attachment of film substrate in the surface of photoconduction so that under the tight state of contact of the light entrance face of the light-emitting area of semiconductor light-emitting elements and photoconduction, this back lighting device is received in the metal framework.
Especially, according to patent documentation 1, escape to metal framework in order to make the heat that produces in the semiconductor light-emitting elements, the metallic film of heat transmission is arranged on the almost whole surface on another surface that semiconductor light-emitting elements is not installed on the film substrate, and metallic film is pushed by metal framework.In addition,, use so-called side-light type (side-view-type) LED, and the film substrate is bonded in securely the bigger area of photoconduction as semiconductor light-emitting elements according to patent documentation 1.
Light emitting diode has at work heating and the characteristic of deterioration easily under hot environment.Therefore, in order to increase the life-span of light emitting diode, require to improve radiating efficiency, and under low temperature environment, drive.
In addition, also require under the situation of light emitting diode deterioration, can easily replace to light emitting diode.Disclosed in patent documentation 1, the film substrate that LED is installed on it is attached in the structure of photoconduction, needs the work of decomposing back lighting device and the film substrate being peeled off from photoconduction.Securely the film substrate is attached to photoconduction, the work of then replacing is consuming time.
Summary of the invention
According to a first aspect of the invention, provide a kind of lighting unit, comprising: photoconduction, this photoconduction has the plane of incidence; Framework, this framework keep described photoconduction and separate with the plane of incidence of described photoconduction; Accommodation section, this accommodation section are formed between the plane of incidence and described framework of described photoconduction; And light source cell, this light source cell comprises: a plurality of light emitting diodes, and these a plurality of light emitting diodes have the light-emitting area that is basically parallel to its installed surface separately; The film substrate, described a plurality of light emitting diode is arranged and be equipped with to this film substrate upper edge first direction; Radiating component, this radiating component have the support of the described film substrate of supporting and the reflecting part that extends perpendicular to the second direction of described first direction from described support edge; And adhesive tape, this adhesive tape is bonding and have a heat dissipating with described film substrate and described support, this light source cell is housed inside in the described accommodation section, and be configured to: under this light source cell was housed inside state in the described accommodation section, the light-emitting area of described each light emitting diode was towards the plane of incidence of described photoconduction.
According to a second aspect of the invention, provide a kind of liquid crystal indicator, comprising: display panels, this display panels are configured to keep liquid crystal layer between a pair of substrate; And lighting unit, this lighting unit is arranged on the described display panels, and described display panels is thrown light on, and described lighting unit comprises: photoconduction, this photoconduction has the plane of incidence; Framework, this framework keep described photoconduction and separate with the plane of incidence of described photoconduction; Accommodation section, this accommodation section are formed between the plane of incidence and described framework of described photoconduction; And light source cell, this light source cell comprises: a plurality of light emitting diodes, and these a plurality of light emitting diodes have the light-emitting area that is basically parallel to its installed surface separately; The film substrate, described a plurality of light emitting diode is arranged and be equipped with to this film substrate upper edge first direction; Radiating component, this radiating component have the support of the described film substrate of supporting and the reflecting part that extends perpendicular to the second direction of described first direction from described support edge; And adhesive tape, this adhesive tape is bonding and have a heat dissipating with described film substrate and described support, this light source cell is housed inside in the described accommodation section, and be configured to: under this light source cell was housed inside state in the described accommodation section, the light-emitting area of described each light emitting diode was towards the plane of incidence of described photoconduction.
Description of drawings
The accompanying drawing that is included in this specification and constitutes the part of this specification shows embodiments of the invention, and is used from explanation principle of the present invention with the detailed description one of the general description that above provides and each embodiment that hereinafter will provide.
Fig. 1 is the exploded perspective view of the structure of schematically illustrated liquid crystal indicator according to an embodiment of the invention;
Fig. 2 be schematically illustrated comprise can be applicable to liquid crystal indicator shown in Figure 1, according to the light source cell of the back light unit of the first embodiment of the present invention cutaway view in interior structure;
Fig. 3 is the stereogram of the structure of schematically illustrated light source cell shown in Figure 2;
Fig. 4 is the line A-A cutaway view that got, that the sectional structure of light source cell shown in Figure 3 is shown in Fig. 3;
Fig. 5 is used to describe the figure that extracts/insert the state of light source cell from a side of liquid crystal indicator shown in Figure 1.
The dorsal part structure of the schematically illustrated liquid crystal indicator of Fig. 6.
Fig. 7 is the schematically illustrated cutaway view that comprises the light source cell of the back light unit in the liquid crystal indicator shown in Figure 1 in other interior structure;
Fig. 8 is the figure of comparative result that the temperature rising value of the light emitting diode relevant with the width of adhesive tape is shown;
Fig. 9 is the schematically illustrated cutaway view that comprises the light source cell that can be applicable to back light unit liquid crystal indicator shown in Figure 1, according to a second embodiment of the present invention in interior structure;
Figure 10 is the stereogram of the structure of schematically illustrated light source cell shown in Figure 9;
Figure 11 is the line A-A cutaway view that got, that the sectional structure of light source cell shown in Figure 10 is shown in Figure 10;
Figure 12 is used to describe the cutaway view of extracting/insert the state of light source cell from the dorsal part of liquid crystal indicator shown in Figure 1; And
Figure 13 is used to describe the cutaway view of extracting/insert the state of light source cell from the dorsal part of liquid crystal indicator.
The specific embodiment
Now with reference to accompanying drawing lighting unit according to an embodiment of the invention and liquid crystal indicator are described.In this embodiment, be that the backlight of back light unit comes the liquid crystal indicator of the transmission Presentation Function of display image to be described to having by optionally seeing through from lighting unit.
Particularly, as shown in Figure 1, liquid crystal indicator 1 has roughly rectangular plane transmission type display panels 2, reaches the back light unit 15 that this display panels 2 is thrown light on.This display panels 2 is configured to make keeps liquid crystal layer between a pair of substrate.Particularly, display panels 2 comprise roughly rectangular array base palte 3, roughly rectangular relative substrate 4, and enclosed array base palte 3 and the liquid crystal layer 5 between the substrate 4 relatively.Array base palte 3 is mutually attached by the encapsulant (not shown) with relative substrate 4.
This display panels 2 has the roughly rectangular active area 6 of display image in the inside that sealed material surrounds.This active area 6 is made of a plurality of pixel PX that are arranged in matrix.
Scan line Y extends along the line direction of pixel PX.Holding wire X extends along the column direction of pixel PX, makes and intersects with scan line Y across insulating barrier.Each switch element 7 is set at and comprises the scan line X that is associated and the intersection point between the holding wire X in interior zone.
This switch element 7 for example is made of the thin film transistor (TFT) that comprises semiconductor layer (TFT), and this semiconductor layer is made of non-crystalline silicon or polysilicon.The gate electrode 7G of this switch element 7 and the scan line Y that is associated are electrically connected (or gate electrode 7G and scan line Y form as one).The source electrode 7S of switch element 7 and the holding wire X that is associated are electrically connected (or source electrode 7S and holding wire X-shaped become one).The drain electrode 7D of switch element 7 is electrically connected with the pixel electrode 8 of the display pixel PX that is associated.
Be used for to be arranged on the array base palte 3 or relative substrate 4 with potential difference between the pixel electrode 8 to the common electrode 9 that liquid crystal layer 5 applies voltage based on common electrode 9.Particularly, in the lateral electric field mode that mainly utilizes transverse electric field (electric field of the main surface parallel of basic and array base palte 3), array base palte 3 comprises the common electrode 9 with pixel electrode 8 electric insulations and pixel-oriented electrode 8.In the longitudinal electric field pattern of mainly utilizing longitudinal electric field (basic the electric field vertical with the interarea of array base palte 3), relative substrate 4 comprises across the relative common electrode 9 of liquid crystal layer 5 and pixel electrode 8.This common electrode 9 is identical with pixel electrode 8, is formed by the conductive material of printing opacity.
The surface that contacts with liquid crystal layer 5 of array base palte 3 and relative substrate 4 is oriented film respectively and covers.Array base palte 3 and relative substrate 4 make its alignment films attached mutually under liner (not shown) (for example column liner that forms as one with a substrate) state respect to one another.In this case, between array base palte 3 and relative substrate 4, be formed with predetermined gap.Liquid crystal layer 5 is formed by the liquid-crystal composition that is packaged between array base palte 3 and the relative substrate 4.
In display panels 2, on the outer surface of the outer surface of array base palte 3 and relative substrate 4, be provided with optical element OD1 and OD2.This optical element OD1 and OD2 comprise the polarization plates that its polarization direction is set according to the characteristic of liquid crystal layer 5.In addition, each of optical element OD1 and OD2 can comprise retardation plate as required.
In colored display type liquid crystal indicator, display panels 2 comprises multiple pixel in active area 6, for example shows the blue pixel of the red pixel of red (R), the green pixel that shows green (G), demonstration blue (B).Particularly, red pixel has the Red lightscreening plate that the dominant wavelength of making is the light transmission of redness.Green pixel has the green color filter that the dominant wavelength of making is the light transmission of green.Blue pixel has the blue color filter that the dominant wavelength of making is the light transmission of blueness.These colored filters are arranged on the interarea of array base palte 3 or relative substrate 4.
The first embodiment of the present invention is then described.
As shown in Figure 2, back light unit 15 comprises that light source cell 21, photoconduction 22, framework 23, heat sink 24, the back of the body cover 25 and optical sheet 26.
This photoconduction 22 has towards the secondary principal plane 22b and four rectangle end faces that this primary principal plane 22a is connected with this secondary principal plane 22b of the primary principal plane 22a of the rectangle of display panels 2, the rectangle relative with this primary principal plane 22a.In these four end faces, end face 22c shown in Fig. 2 plays the effect of the plane of incidence relative with light source cell 21.In addition, primary principal plane 22a plays the effect to the exit facet of display panels 2 emergent lights.
Framework 23 is configured to mainly keep photoconduction 22.In addition, this framework 23 is configured to also keep display panels 2.This framework 23 is formed by resin material.Under liquid crystal panel 2 is held in state between frame lid 11 and the framework 23, for example by the joint filling sealing or be threaded frame lid 11 is fixed in framework 23.At this moment, the array base palte 3 of display panels 2 is installed on the framework 23 so that optical element OD1 is relative with photoconduction 22, and substrate 4 is configured to so that optical element OD2 and frame cover 11 relative relatively.
The end face 22c of this framework 23 and photoconduction 22 separates.The accommodation section 30 that can hold light source cell 21 is formed between the end face 22c and framework 23 of this photoconduction 22.Particularly, end face 22c and framework 23 are along the normal direction of paper among Fig. 2, and promptly first direction D1 extends.In addition, end face 22 and framework 23 are separated on the second direction D2 perpendicular to first direction D 1.As shown in Figure 2, accommodation section 30 is its three spaces that are formed with opening portion 30f by end face 22 and framework 23 sealings, its another side.Extend along the first direction D1 parallel with the bearing of trend of light source cell 21 this accommodation section 30.Similarly, opening portion 30F extends along first direction D 1.
The back of the body cover 25 and is formed and roughly is box-like, and this back of the body covers 25 and for example can hold photoconduction 22 and framework 23 simultaneously.
Fig. 3 and Fig. 4 are shown in further detail light source cell 21.
A plurality of light emitting diodes 41 are arranged and are installed on the film substrate 42 along first direction D 1.In example shown in Figure 3, a plurality of light emitting diode 41 is arranged in delegation along first direction, but also can be arranged in multirow.Film substrate 42 forms the band shape (promptly having along the roughly rectangular shape on the long limit that first direction D1 extends) of extending along first direction D1.
Particularly, support 43A has and comprises along the long limit of first direction D1 and roughly rectangular shape along the minor face of the third direction D3 vertical with first direction D1 and second direction D2.The length along the minor face of third direction D3 of support 43A is equal to or greater than the width (being the length of the minor face of rectangle) of film substrate 42.Reflecting part 43B has and comprises along the long limit of first direction D1 with along the roughly rectangular shape of the minor face of second direction D2.The long limit of support 43A is connected with the long limit of reflecting part 43B.
In the example shown here, radiating component 43 also comprises the reflecting part 43C relative with reflecting part 43B.This reflecting part 43C has and comprises along the long limit of first direction D1 with along the roughly rectangular shape of the minor face of second direction D2.Reflecting part 43C is connected with another long limit of support 43A.In brief, radiating component 43 is formed and makes to have the cross section that roughly takes the shape of the letter U.
And this radiating component 43 is along the distolateral insertion section 43E that comprises of the one of first direction D1.In addition, radiating component 43 is at its another the distolateral handle part 43F that comprises along first direction D1.Handle part 43F be formed at the vertical substantially plane of support 43A, reflecting part 43B and reflecting part 43C in.Screw H1 for example is formed among this handle part 43F.
This radiating component 43 is formed by the metal material that has heat dissipating such as stainless steel (SUS) or aluminium (Al) etc.Reflecting part 43B and 43C are formed and make its surface that surrounds light emitting diode 41 have light reflective, and reflection is from the part emergent light of light emitting diode 41.
Above-mentioned accommodation section 30 is configured to make the light source cell 21 with said structure can insert accommodation section 30/ along the bearing of trend (being first direction D1) of light source 30 to extract from the accommodation section.Particularly, accommodation section 30 has guide portion, makes light source cell 21 to be inserted/removes along bearing of trend D1.This guide portion is located in photoconduction 22, framework 23 and the heat sink 24 that constitutes accommodation section 30 at least one.For example, as shown in Figure 2, because the interior shape in the cross section of the outer shape in the cross section of the radiating component 43 of light source cell 21 and accommodation section 30 is basic identical, so light source cell 21 can be inserted in the accommodation section 30 when being directed.In addition, accommodation section 30 has the recess of the insertion section 43E that has wherein inserted light source cell 21.Though this recess is not shown, for example be formed on the framework 23.
As mentioned above, the light source cell 21 that is inserted in the accommodation section 30 is located at the precalculated position by guide portion and recess.In addition, be inserted at light source cell 21 under the state of accommodation section 30, as shown in Figure 5, the handle part 43F of radiating component 43 is threadedly connected on the framework 23.Particularly, screw SC1 is inserted from the screw H1 that is formed on the handle part 43F, and be fixed in framework 23.Thereby, under light source cell 21 is located in state in the accommodation section 30, light source cell 21 is fixed on the framework 23.
Like this, be inserted at light source cell 21 under the state of accommodation section 30, as shown in Figure 2, the light-emitting area 41E of light emitting diode 41 is relative with the end face of photoconduction 22, and the reflecting part 43B of radiating component 43 contacts with heat sink 24.At this moment, the support 43A of radiating component 43 contacts with framework 23 with reflecting part 43C.
In this case, to separate be desirable to the end face of the light-emitting area 41E of light emitting diode 41 and photoconduction 22.Because light emitting diode 41 is thermals source, therefore if light emitting diode 41 contacts with photoconduction 22, the problem of photoconduction 22 distortion may take place then to cause because of the influence of this heat.In first embodiment,, therefore need not by making light emitting diode 41 contact positioned light source unit 21 with photoconduction 22 owing to be under light source cell 21 is inserted in state in the accommodation section 30, light source cell 21 to be positioned.
According to said structure, in light source cell 21, be equipped with as the film substrate 42 of a plurality of light emitting diodes of thermal source attached with radiating component 43 on it by adhesive tape 44 with heat dissipating.Therefore, the heat that produces in the light emitting diode 41 can escape into radiating component 43 by adhesive tape 44 from film substrate 42.Especially, do not play the air of heat guard effect etc. between them because film substrate 42 is attached to support 43A, therefore the heat from light emitting diode 41 can directly escape into radiating component 43 from film substrate 42, and can improve radiating efficiency.
In addition, be inserted at light source cell 21 under the state of accommodation section 30, radiating component 43 contacts with heat sink 24.Therefore, the heat that produces from light emitting diode 41 also can escape into heat sink 24 from the radiating component 43 of light source cell 21.By heat dissipation path is increased heat sink 24, to compare with the situation of only using radiating component 43, thermal capacity increases, and can further improve radiating efficiency.And, because heat sink 24 is exposed to extraneous air, therefore can further improve radiating efficiency.
Thereby, can under low relatively temperature environment, drive light emitting diode 41, and the life-span of light emitting diode 41 is increased.
In addition, for example needing to replace under the situation of light source cell 21 because of light emitting diode 41 deteriorations, as shown in Figure 5, can along the bearing of trend of light source cell 21 side direction of light source cell 21 30 past liquid crystal indicators 1 from the accommodation section be extracted (side direction is pulled out mode) by the handle part 43F that keeps radiating component 43.Thus, can be easily light source cell 21 be replaced as individual unit.
Be inserted at light source cell 21 under the state of accommodation section 30, the reflecting part 43B of radiating component 43 and heat sink 24 fixedly are desirable by screw SC2.For example, as shown in Figure 6,, can improve the adhesiveness between radiating component 43 and the heat sink 24 by be threaded (two positions is threaded the example shown in Figure 6) from the dorsal part of liquid crystal indicator 1.Thereby, can further improve from the heat radiation of radiating component 43 to heat sink 24.
The variation of first embodiment then, is described.In example shown in Figure 2, by the sealing of joint filling for example or be threaded and heat sink 24 be fixed to the outside of framework 23.In this variation, different with the example of Fig. 2 as shown in Figure 7, heat sink 24 is arranged at the inboard of framework 23, and contacts with the support 43A of radiating component 43.This heat sink 24 seals or is threaded by for example joint filling and fixed.According to the variation of this structure, be inserted at light source cell 21 under the state of accommodation section 30, be not only reflecting part 43B and contact, and the support 43A of heat sink 43 also contacts with heat sink 24 with heat sink 24.Therefore, compare with the example that support 43A contacts, can further improve radiating efficiency with resinous framework 23 among Fig. 2.
According to above-mentioned first embodiment, light source cell 21 comprises a plurality of light emitting diodes 41 of arranging and install along first direction D1.The accommodation section 30 that is surrounded by photoconduction 22, framework 23 and heat sink 24 is configured to insert/to extract light source cell 21 along first direction D1.By 30 extracting light source cell 21, can easily replace light source cell 21 from the accommodation section.
In addition, in light source cell 21, can improve from the heat dissipating of the heat of light emitting diode 41 generations.Thus, light emitting diode 41 can be under low temperature environment, driven, and the life-span of light emitting diode 41 can be increased.
The width of the adhesive tape 44 that adopts among this first embodiment preferably should be equal to or greater than the width (promptly along third direction D3 length) of film substrate 42.
Equal at the width of adhesive tape 44 under the situation (1mm) of width less than the width of film substrate 42 of the situation (3mm) of the width of film substrate 42 and adhesive tape 44, relatively the temperature rising value of light emitting diode 41.Fig. 8 illustrates the comparative result of the temperature rising value under each bandwidth.
Here, the temperature rising value is defined as the temperature of the light emitting diode 41 before driving and temperature poor of the light emitting diode 41 after the electric current of scheduled volume and the stable moment of light emitting diode rise through two hours is provided to light emitting diode 41.
Width at adhesive tape 44 is under the situation of 1mm, and the temperature rising value is 34.9 ℃ when light emitting diode 41 provides the electric current of 75mA, and the temperature rising value is 79.6 ℃ when light emitting diode 41 provides the electric current of 150mA.
On the other hand, be under the situation of 3mm at the width of adhesive tape 44, the temperature rising value is 22.8 ℃ when light emitting diode 41 provides the electric current of 75mA, and the temperature rising value is 54.9 ℃ when light emitting diode 41 provides the electric current of 150mA.
Under the situation of width less than the width of film substrate 42 of adhesive tape 44, heat reduces from the path that film substrate 42 escapes into radiating component 43.In addition, in the part that does not have adhesive tape 44, have air layer between film substrate 42 and radiating component 43, this air layer makes between film substrate 42 and the radiating component 43 heat insulation.Therefore, can't obtain enough radiating effects, and cause the temperature of light emitting diode 41 to rise.
Thereby the adhesive tape 44 that adopts its width to be equal to or greater than the width of film substrate 42 is desirable.Thus, can make the bonding of film substrate 42 with its surperficial relative whole surface and radiating component 43 that light emitting diode 41 is installed.Thereby, can guarantee enough heat paths, and between film substrate 42 and radiating component 43, not have air layer.
Then, the second embodiment of the present invention is described.
The difference of this second embodiment and first embodiment is that accommodation section 30 is configured to make light source cell 21 to dismantle from opening portion 30F.Indicate with identical label for the component part identical, and here omit and describe in detail with first embodiment.
Particularly, as shown in Figure 9, comprise that according to the back light unit 15 of second embodiment light source cell 21, photoconduction 22, framework 23, the back of the body covers 25, reach optical sheet 26.
An end face 22c of framework 23 and photoconduction 22 separates.Between the end face 22c of this framework 23 and photoconduction 22, be formed with accommodation section 30.Accommodation section 30 is the spaces that have the cross section that roughly takes the shape of the letter U between the end face 22c of photoconduction 22 and framework 23, and extend along first direction D1 this accommodation section 30.
The back of the body cover 25 and is formed and roughly is box-like, and this back of the body covers 25 and for example can hold photoconduction 22 and framework 23 simultaneously.This back of the body lid 25 comprises towards the outstanding protuberance 25X of the dorsal part of back light unit 15.This protuberance 25X extends along first direction D1.
As Figure 10 and shown in Figure 11, light source cell 21 is configured to have the shape of extending along first direction D1, and comprises light emitting diode 41, film substrate 42, radiating component 43, and adhesive tape 44.
Radiating component 43 is along the distolateral insertion section 43E that comprises of the one of first direction D1.In example shown in Figure 10, insertion section 43E extends from reflecting part 43B.Another distolateral attached screw SC3 that has at radiating component 43 along first direction D1.In example shown in Figure 10, screw SC3 is from the dorsal part of back light unit 15 is inserted into screw H2 the elongated surfaces that is formed at reflecting part 43B towards third direction D3.
And this radiating component 43 comprises the protuberance 43X that extends along first direction D1 in its reflecting part 43B.Towards the inboard that surrounds light emitting diode 41, promptly accommodation section 30 is outstanding from the dorsal part of back light unit 15 for this protuberance 43X.Thus, can improve the rigidity of radiating component 43, thereby improve the rigidity of light source cell 21.
Above-mentioned accommodation section 30 can be configured to make that the light source cell 21 with said structure can 30 dismountings from the accommodation section.Particularly, as Figure 12 and shown in Figure 13, the end face 22c and the accommodation section with the cross section that roughly takes the shape of the letter U 30 between the framework 23 that are formed at photoconduction 22 comprise not by the opening portion 30F of the end face 22c of photoconduction 22 and framework 23 encirclements.Opening portion 30F extends along first direction D1.In addition, the framework 23 of formation accommodation section 30 has the recess 30A of the insertion section 43E that has wherein inserted light source cell 21.In addition, framework 23 is provided with the fixing screw 30B of screw SC3 that will be inserted among the reflecting part 43B of light source cell 21.
The work that light source cell 21 is attached to accommodation section 30 is undertaken by following process.Particularly, from the dorsal part of back light unit 15 the insertion section 43E of light source cell 21 is inserted into the recess 30A of framework 23.Then, insert the support 43A comprise light emitting diode 41 etc. from opening portion 30F.At this moment, reflecting part 43B cover 25 protuberance 25X along the back of the body and is provided with, and the part of reflecting part 43B overlaps to carry on the back and covers on 25 (that is the back sides of back light unit 15).The reflecting part 43B that the opening portion 30F of accommodation section 30 is provided with in this mode covers.And another of light source cell 21 is distolateral to be threadedly connected to framework 23 by screw SC3, thereby light source cell 21 is fixed.
The work of 30 dismounting light source cells 21 is by carrying out with above-mentioned opposite step from the accommodation section.
Being contained in light source cell 21 in the accommodation section 30 for example covers 25 protuberance 25X and the engaging between the reflecting part 43B and insertion section 43E by the back of the body and is located at the precalculated position to the insertion of recess 30A.In addition, under light source cell 21 is housed inside state in the accommodation section 30, screw SC3 is fixed on the framework 23.Thereby, be located at light source cell 21 under the state of accommodation section 30, light source cell 21 is fixed on the framework 23.
As mentioned above, under light source cell 21 was housed inside state in the accommodation section 30, as shown in Figure 9, the light-emitting area 41E of light emitting diode 41 was towards the end face 22c of photoconduction 22, and the reflecting part 43B of radiating component 43 covers accommodation section 30.
At this moment, the support 43A of radiating component 43 and reflecting part 43C contact with framework 23, and light source cell 21 is positioned.
Simultaneously, identical with first embodiment in this case, it is desirable that the end face 22c of the light-emitting area 41E of light emitting diode 41 and photoconduction 22 separates.
According to said structure, identical with first embodiment, can improve radiating efficiency.Thereby, light emitting diode 41 can be under low relatively temperature environment, driven, and the life-span of light emitting diode 41 can be increased.
Under light source cell 21 was housed inside state in the accommodation section 30, radiating component 43 covered 25 with the back of the body and contacts.The back of the body cover 25 and is formed by the metal material with heat dissipating, and the heat that can make generation in the light emitting diode 41 further escapes into to carry on the back from the radiating component 43 of light source cell 21 and covers 25.Cover 25 by heat dissipation path is increased the back of the body, compare with the situation of only using radiating component 43, thermal capacity increases, and can further improve radiating efficiency.
And under light source cell 21 was housed inside state in the accommodation section 30, reflecting part 43B formed the external packing of back light unit 15, and is exposed in the extraneous air.Similarly, the back of the body covers 25 and also forms the external packing of back light unit 15, and is exposed in the extraneous air.Therefore, can further improve radiating efficiency.
In addition, the reflecting part 43B of formation light source cell 21 comprises the protuberance 43X that extends along the bearing of trend of this reflecting part 43B.Thus, even radiating component 43 is formed to realize alleviating of weight by the metallic sheet material of relative thin, also can improve the rigidity of light source cell 21.
Therefore, can suppress along the generation of the warpage of the bearing of trend of light source cell 21.In addition, can prevent the distortion of reflecting part 43B, can improve reflecting part 43 and cover 25 adhesiveness, can impel heat to transfer to the back of the body and cover 25 from reflecting part 43B for the back of the body, and the energy inhibitory reflex 43B of portion and carry on the back the light leak that covers between 25.
And, utilize protuberance 43B can increase the surface area of reflecting part 43B.Because reflecting part 43B forms external packing, the surface area that therefore is exposed in the extraneous air increases, and can further improve radiating efficiency.
On the other hand, for example needing to replace under the situation of light source cell 21 because of deterioration of light emitting diode 41 etc., light source cell 21 is as Figure 12 and shown in Figure 13, can be after removing screw SC3, (back side method for drawing out) 30 extracted from the accommodation section in the back side (being the back side of light source cell 21) by liquid crystal indicator 1.Thus, can be easily light source cell 21 be replaced as individual unit.
According to above-mentioned second embodiment, light source cell 21 comprises a plurality of light emitting diodes 41 of arranging and install along first direction D1.This light source cell 21 is housed inside in the accommodation section 30 that is formed by the end face of photoconduction 22 and framework 23.Accommodation section 30 be configured to can be from the accommodation section 30 pull out into/extract light source cell 21.Under light source cell 21 was housed inside state in the accommodation section 30, the reflecting part 43B of radiating component 43 covered accommodation section 30.Therefore, by 30 extracting light source cell 21, can easily replace light source cell 21 from the accommodation section.
In addition, in light source cell 21, can improve the heat dissipating of the heat that from light emitting diode 41, produces.Thus, light emitting diode 41 can be under low temperature environment, driven, and the life-span of light emitting diode 41 can be increased.
About the adhesive tape 44 that adopts among this second embodiment, identical with first embodiment, the width of this adhesive tape 44 (promptly along third direction D3 length) should preferably be equal to or greater than the width of film substrate 42.
As mentioned above, present embodiment can provide lighting unit and comprise the liquid crystal indicator of this lighting unit, and this lighting unit comprises the radiator structure in the life-span that can increase light emitting diode, and can easily replace the light source cell that comprises light emitting diode.
The present invention directly is not confined to the foregoing description.In practice, can in the scope that does not break away from spirit of the present invention, do various distortion and specific to inscape.In addition, can disclosed inscape forms various inventions in the foregoing description by suitably making up.For example, also can from embodiment, omit some inscapes in disclosed all inscapes.And, also can suitably make up the inscape among the different embodiment.
At least a portion that transmission-type liquid crystal display floater described in the various embodiments described above needs only at active area has the illumination optical transmission Presentation Function that optionally sees through from back light unit 15, then can have arbitrary structures, and this transmission-type liquid crystal display floater can comprise the semitransmissive liquid crystal display panel that each pixel wherein has reflecting part and transmissive portions.
Claims (12)
1. a lighting unit is characterized in that, comprising:
Photoconduction, this photoconduction has the plane of incidence;
Framework, this framework keep described photoconduction and separate with the plane of incidence of described photoconduction;
Accommodation section, this accommodation section are formed between the plane of incidence and described framework of described photoconduction; And
Light source cell, this light source cell comprises: a plurality of light emitting diodes, these a plurality of light emitting diodes have the light-emitting area that is basically parallel to its installed surface separately; The film substrate, described a plurality of light emitting diode is arranged and be equipped with to this film substrate upper edge first direction; Radiating component, this radiating component have the support of the described film substrate of supporting and the reflecting part that extends perpendicular to the second direction of described first direction from described support edge; And adhesive tape, this adhesive tape is bonding and have a heat dissipating with described film substrate and described support, this light source cell is housed inside in the described accommodation section, and be configured to: under described light source cell was housed inside state in the described accommodation section, the light-emitting area of each described light emitting diode was towards the plane of incidence of described photoconduction.
2. lighting unit as claimed in claim 1 is characterized in that,
Also comprise heat sink, this heat sink covers the opening portion of extending along the first direction of described accommodation section,
The described accommodation section is formed the tubular that extends along described first direction, and is configured to and can inserts/extract described light source cell along described first direction, and
Described heat sink contacts with the described reflecting part of described light source cell in being inserted into the described accommodation section.
3. lighting unit as claimed in claim 2 is characterized in that,
Under described light source cell was inserted into state in the described accommodation section, the described reflecting part of described light source cell was fixing by being threaded with described heat sink.
4. lighting unit as claimed in claim 2 is characterized in that,
Under described light source cell was inserted into state in the described accommodation section, the radiating component of described light source cell was fixed in described framework by being threaded.
5. lighting unit as claimed in claim 1 is characterized in that,
The described accommodation section is configured to the described light source cell of opening portion attachable/detachable that can extend from the described first direction along the described accommodation section, and
The described reflecting part that is installed in the described light source cell in the described accommodation section covers the opening portion of described accommodation section.
6. lighting unit as claimed in claim 5 is characterized in that,
Described light source cell comprises the outstanding and protuberance that extend along described first direction to the described accommodation section.
7. lighting unit as claimed in claim 5 is characterized in that,
Described radiating component is along the distolateral insertion section that comprises of the one of described first direction, and under described light source cell is installed in state in the described accommodation section, along described first direction its another distolaterally be fixed in described framework by being threaded.
8. lighting unit as claimed in claim 5 is characterized in that,
The described reflecting part of described light source cell forms the external packing of described lighting unit.
9. lighting unit as claimed in claim 1 is characterized in that,
The width of described adhesive tape is equal to or greater than the width of described film substrate.
10. lighting unit as claimed in claim 1 is characterized in that,
Described radiating component is formed by metal material.
11. lighting unit as claimed in claim 1 is characterized in that,
The light-emitting area of described light emitting diode and the plane of incidence of described photoconduction are separated.
12. a liquid crystal indicator is characterized in that, comprising:
Display panels, this display panels are configured to keep liquid crystal layer between a pair of substrate; And
Lighting unit, this lighting unit is arranged on the described display panels, and described display panels is thrown light on, and described lighting unit comprises: photoconduction, this photoconduction has the plane of incidence; Framework, this framework keep described photoconduction and separate with the plane of incidence of described photoconduction; Accommodation section, this accommodation section are formed between the plane of incidence and described framework of described photoconduction; And light source cell, this light source cell comprises: a plurality of light emitting diodes, and these a plurality of light emitting diodes have the light-emitting area that is basically parallel to its installed surface separately; The film substrate, described a plurality of light emitting diode is arranged and be equipped with to this film substrate upper edge first direction; Radiating component, this radiating component have the support of the described film substrate of supporting and the reflecting part that extends perpendicular to the second direction of described first direction from described support edge; And adhesive tape, this adhesive tape is bonding and have a heat dissipating with described film substrate and described support, this light source cell is housed inside in the described accommodation section, and be configured to: under this light source cell was housed inside state in the described accommodation section, the light-emitting area of each described light emitting diode was towards the plane of incidence of described photoconduction.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008164861 | 2008-06-24 | ||
| JP2008-164861 | 2008-06-24 | ||
| JP2008164861A JP2010009787A (en) | 2008-06-24 | 2008-06-24 | Illumination unit, and liquid crystal display therewith |
| JP2008-166037 | 2008-06-25 | ||
| JP2008166037A JP2010009845A (en) | 2008-06-25 | 2008-06-25 | Illumination unit, and liquid crystal display therewith |
| JP2008166037 | 2008-06-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101634413A true CN101634413A (en) | 2010-01-27 |
| CN101634413B CN101634413B (en) | 2012-03-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101398316A Active CN101634413B (en) | 2008-06-24 | 2009-06-24 | Illumination unit and liquid crystal display device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2010009787A (en) |
| CN (1) | CN101634413B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2010009787A (en) | 2010-01-14 |
| CN101634413B (en) | 2012-03-14 |
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Owner name: JAPAN DISPLAY MIDDLE INC. Free format text: FORMER OWNER: TOSHIBA MOBILE DISPLAY CO., LTD. Effective date: 20120827 |
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Effective date of registration: 20120827 Address after: Saitama Prefecture, Japan Patentee after: Japan Display East Inc. Address before: Tokyo, Japan Patentee before: Toshiba Mobile Display Co., Ltd. |