CN100443986C - Backlight lamp device and liquid crystal display device - Google Patents
Backlight lamp device and liquid crystal display device Download PDFInfo
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- CN100443986C CN100443986C CNB2005101138518A CN200510113851A CN100443986C CN 100443986 C CN100443986 C CN 100443986C CN B2005101138518 A CNB2005101138518 A CN B2005101138518A CN 200510113851 A CN200510113851 A CN 200510113851A CN 100443986 C CN100443986 C CN 100443986C
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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
- G02F1/133603—Direct backlight with LEDs
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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
- G02F1/133605—Direct backlight including specially adapted reflectors
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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
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S362/00—Illumination
- Y10S362/80—Light emitting diode
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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)
- Planar Illumination Modules (AREA)
- Liquid Crystal (AREA)
- Led Device Packages (AREA)
Abstract
The present invention provides a thin liquid crystal display device and a backlight device. This backlight device 14 having a diffusion sheet 36 diffusing light and a light source part 40 arranged behind a diffuser panel obtains surface light emission by diffusing light emitted from the light source part with the diffuser panel. The light source part has a plurality of light emitting parts 50 arranged along a plane parallel to the diffuser panel. Each of the plurality of light emitting parts is provided with a base material 66 made of a translucent material and having an emitting surface 68 facing the diffuser panel, a light emitting element 72 embedded in the base material, a reflecting surface 77 guiding the light generated by the light emitting element from the whole area or almost the whole area of the emitting surface to the diffuser panel perpendicularly or almost perpendicularly, and a reflection part 70.
Description
Technical field
The liquid crystal indicator that the present invention relates to be used in the backlight apparatus of liquid crystal indicator and have this backlight apparatus.
Background technology
The liquid crystal indicator of display device that is used as computing machine is because the right and wrong of liquid crystal own are luminiferous, so needs so-called backlight apparatus such lighting device.As the light source of such backlight apparatus, generally all use thin fluorescent tubes directly such as cold-cathode tube now.And as the collocation method of cold-cathode tube, known have along the edge light mode of the edge configuration fluorescent tube of liquid crystal panel and the behind of liquid crystal panel dispose a plurality of fluorescent tubes under mode (with reference to patent documentation 1).These two modes relatively, under mode since the light that penetrates from fluorescent tube without light guide plate etc. and directly ejaculation, so than the light utilization ratio height of edge light mode.Therefore, mode is applicable to the purposes of the televisor developing device that requires to have high brightness etc. under.
Patent documentation 1: the spy opens the 2004-186080 communique
Particularly, with reference to Fig. 9 and Figure 10 illustrate simply adopted under the existing backlight apparatus of mode.As shown in the figure, be configured in liquid crystal panel 110 backlight apparatus 112 behind and have tetragonal preceding frame 114.The inboard of former frame 114 the has contained lamination transmittance section 116 of a plurality of light-passing boards.In illustrated conventional example, transmittance section 116 has four light-passing boards that dispose successively from the liquid crystal panel side, i.e. polaroid 118, front side diffusion sheet 120, rear side diffusion sheet 122, diffuser plate 124.Dispose after-frame 126 in the behind of transmittance section.After-frame 126 is formed with plate is crooked and separate the relative quadrilateral base portion 128 of predetermined distance with transmittance section 116 and from the relative both sides portion of base portion 128 support 130 of bending upward, configuration is the inboard of former frame 114 fixedly, so that two supports, 130 supporting transmittance sections 116.In the space 132 of the inboard that is formed at after-frame 126, dispose a plurality of cold-cathode tubes (fluorescent tube) 134 side by side.These cold-cathode tubes 134 are maintained at the position of regulation by two supporting stations 134, and two ends separately are supported on the lamp supporting station 138.In addition, base portion 128 supporting separates a plurality of separation pins 140 of predetermined distance configuration, and each upper end of separating pin 140 contacts with transmittance section 116 and prevents the deflection of this transmittance section 116.Dispose cold cathode tube lighting in the behind of after-frame 126 with inverter 142, on this inverter 142, be connected with a plurality of cold-cathode tubes 134.
According to the backlight apparatus 112 of such formation, by from inverter 142 supply capabilities, make a plurality of cold-cathode tube 134 luminous.From the light that cold-cathode tube 134 penetrates, from cold-cathode tube 134 towards the transmittance section 116 light of advancing (light that advance in the top to figure) directly inject transmittance section 116.In addition, launch in after-frame 126 reflections or at adjacent cold-cathode tube 134, incide transmittance section 116 then from the light (below to figure and the light of lateral travel) that cold-cathode tube 134 is advanced to after-frame 126.The light that arrives transmittance section 116 is by diffuser plate 124 and diffusion sheet 120,122 diffusions.At this moment, diffuser plate 124 enlarges the visual angle of incident light wherein.In addition, the visual angle constriction that diffusion sheet 120,122 will be extended.Therefore, the light that penetrates from last diffusion sheet 120 is called all simultaneously luminous of high brightness.At last, the light incident polarization sheet 118 that penetrates from diffusion sheet 120, at this to the prescribed direction polarization and incident liquid crystal panel 110.
But above-mentioned backlight apparatus 112 uses cold-cathode tube 134 as light source.This cold-cathode tube 134 penetrates light on the omnirange on the transverse section.Therefore, in order to reclaim and effectively utilize the light that penetrates to after-frame 126 from cold-cathode tube 134, at cold-cathode tube 134 and be disposed at the interval that regulation is set between its after-frame 126 behind, and big gap to a certain degree is set between adjacent cold-cathode tube 134, thus, need to inject the light reflection of after-frame 126 from cold-cathode tube 134, and send to liquid crystal panel 110 through the gap between the adjacent cold-cathode tube 134.Therefore, with the size increase of transmittance section 116 vertical direction, it becomes problem on the liquid crystal indicator miniaturization.In addition, cold-cathode tube 134 separates the predetermined distance configuration, to incide the light quantity in the transmittance section zone relative with the zone line of adjacent cold-cathode tube 134 many so incide the light amount ratio that is positioned at the zone, transmittance section directly over the cold-cathode tube 134, and it becomes the reason that causes the brightness of image inequality that shows on liquid crystal panel 110.Therefore, in order to eliminate the brightness disproportionation of the image that shows on the liquid crystal panel, as mentioned above, a plurality of proliferation parts (diffuser plate 124, diffusion sheet 120,122) need be set on transmittance section 116.
In addition, cold-cathode tube 134 is compared the shortcoming with color reproduction difference with Braun (Block ラ ウ Application) pipe.In order to eliminate this problem, consider that utilizing the semiconductor light emitting liquid crystal as the backlight light source is light emitting diode, but in order to make color image reproduction, have to be provided with and produce three kinds of light emitting diodes red, blue, green light.At this moment, generate white light, must guarantee that light emitting diode is enough big to the distance of liquid crystal panel, therefore, have the problem that the thickness of backlight apparatus increases for the abundant colour mixture of light that will penetrate from three light emitting diodes.
Summary of the invention
Therefore, the objective of the invention is to utilize other light sources to replace cold-cathode tube and small-sized backlight apparatus and liquid crystal indicator is provided.
For realizing this purpose, the backlight apparatus of first aspect present invention, it has the proliferation part and the light source portion that is configured in the behind of above-mentioned proliferation part of the sheet of diffusion light, the light diffusion that to penetrate from above-mentioned light source portion by above-mentioned proliferation part and the face that obtains is luminous, above-mentioned light source portion has a plurality of illuminating parts along the planar configuration parallel with above-mentioned proliferation part, and above-mentioned a plurality of illuminating parts comprise respectively: the base material that is made of translucent material with outgoing plane relative with above-mentioned proliferation part; Imbed the light-emitting component of the inside of above-mentioned base material; The light that will produce by above-mentioned light-emitting component from the whole zone of above-mentioned outgoing plane or roughly whole zone to the above-mentioned proliferation part light guide part of guiding vertically or generally perpendicularly; It is characterized in that, above-mentioned smooth guide part comprises: first surface portion, it is formed on the above-mentioned outgoing plane, to directly inject with incident angle from first light that above-mentioned light-emitting component penetrates, and will vertically or generally perpendicularly penetrate to above-mentioned proliferation part with first light of directly injecting less than the incident angle of above-mentioned critical angle less than critical angle; Second surface portion, it is formed on the above-mentioned outgoing plane, will directly inject with the incident angle more than or equal to critical angle from second light that above-mentioned light-emitting component penetrates, simultaneously will be with second light injected more than or equal to the incident angle of above-mentioned critical angle to internal reflection; Reflecting part, it is formed on the surface of above-mentioned base material, will be by above-mentioned second surface portion to second light reflection of internal reflection and to inject above-mentioned second surface portion less than the incident angle of critical angle, then, vertically or generally perpendicularly penetrate to above-mentioned proliferation part from above-mentioned second surface portion.
In the backlight apparatus of second aspect present invention, the outgoing plane of above-mentioned illuminating part has the flat shape of rectangle.
In the backlight apparatus of third aspect present invention, above-mentioned smooth guide part has the light reflection that will penetrate from above-mentioned light-emitting component and to the above-mentioned proliferation part reflecting part of guiding vertically or generally perpendicularly.
In the backlight apparatus of fourth aspect present invention, be formed with the gap between at least two adjacent illuminating parts in above-mentioned a plurality of illuminating parts, on above-mentioned gap, dispose the pin that extends and support above-mentioned proliferation part from above-mentioned illuminating part to above-mentioned proliferation part direction.
In the backlight apparatus of fifth aspect present invention, above-mentioned light source portion has a plurality of illuminating part mounted boards with above-mentioned proliferation part configured in parallel, and above-mentioned illuminating part is being configured in first direction and along on the second direction of above-mentioned plane and above-mentioned first direction quadrature on the above-mentioned illuminating part mounted board.
In the backlight apparatus of sixth aspect present invention, on above-mentioned illuminating part mounted board, be configured in a plurality of illuminating parts and a corresponding light quantity adjustment part connection on the above-mentioned first direction.
In the backlight apparatus of seventh aspect present invention, above-mentioned light-emitting component has three light emitting sources of the redness of penetrating, green, blue light.
Liquid crystal indicator of the present invention is characterized in that, has the described backlight apparatus of above-mentioned either side and the liquid crystal panel of the light that penetrates from the proliferation part of above-mentioned backlight apparatus is arranged by projection.
According to the backlight apparatus of first aspect, the light that produces by light-emitting component from the whole zone of the outgoing plane of illuminating part or roughly whole district with vertical to proliferation part or generally perpendicularly guide.Therefore, used the backlight apparatus of the cold-cathode tube of tubulose to utilize from the light of this cold-cathode tube to the omnirange ejaculation for effective, and need form the space in the behind of cold-cathode tube, therefore, problem with thickness increase of backlight apparatus, but in the backlight apparatus of the present invention, owing to need not realize miniaturization so can reduce whole thickness in setting space as above, the behind of illuminating part.In addition, because the light of injecting to outgoing plane with the angle tilt ground more than the critical angle from light-emitting component is reflected by this outgoing plane and reflecting part, vertically or generally perpendicularly guide to proliferation part from outgoing plane then, so can apply flexibly the light that penetrates from light-emitting component effectively.
The backlight apparatus of second aspect is because the outgoing plane of illuminating part has rectangular shape, so parallel no gap of proliferation part, a plurality of illuminating parts territory or roughly configuration seamlessly can be able to be accessed the planar light beam of advancing towards proliferation part.
The backlight apparatus of the third aspect, owing to will vertically or generally perpendicularly guide to the light reflection of tilted direction or laterally ejaculation and to proliferation part from light-emitting component, so can apply flexibly the light that penetrates from light-emitting component effectively.
The backlight apparatus of fourth aspect, owing to support proliferation part by the pin that is configured between the adjacent illuminating part, so there is not the deflection of proliferation part, the face that can access homogeneous is luminous.
The backlight apparatus of the 5th aspect, because each illuminating part mounted board and supporting a plurality of illuminating parts are thereon together taken out, so assemble easily and keep in repair.
The backlight apparatus of the 6th aspect, the a plurality of illuminating parts along the first direction configuration are connected with a light quantity adjustment part in a plurality of illuminating parts on each illuminating part mounted board owing to be equipped on, so the light quantity of these a plurality of illuminating parts can be adjusted by a light quantity adjustment part as a unit.
The backlight apparatus of the 7th aspect is because light-emitting component has redness, green, blue light emitting source, so can supply with white light with this three mixture of colours to the liquid crystal indicator with this backlight apparatus.
Liquid crystal indicator of the present invention is given the advantage that backlight apparatus had of above-mentioned each side.
Description of drawings
Fig. 1 is the sectional view of liquid crystal indicator of the present invention and backlight apparatus;
Fig. 2 is the exploded perspective view of backlight apparatus shown in Figure 1;
Fig. 3 (a) is the planimetric map of light source portion, (b) is its sectional view;
Fig. 4 (a) is the planimetric map of light source cell, (b) is its left surface figure, (c) is its right hand view, (d) is its front view (FV);
Fig. 5 is the amplification profile of illuminating part;
Fig. 6 is the figure of expression from the path of the light of illuminating part ejaculation;
Fig. 7 is the circuit diagram of output regulation circuit;
Fig. 8 is the circuit diagram that color is adjusted circuit;
Fig. 9 is the sectional view of existing liquid crystal indicator and backlight apparatus;
Figure 10 is the exploded perspective view of backlight apparatus shown in Figure 9.
Symbol description
10: liquid crystal indicator, 12: liquid crystal panel, 14: backlight apparatus, 16: framework, 18: preceding frame, 20: after-frame, 22: horizontal frame, 24: lip portions, 26: peristome, 28: the bottom, 30: sidewall, 32: the space, 34: transparent panel, 36: diffuser plate, 38: polarization plates, 40: light source portion, 42: the illuminating part mounted board, 44: base plate, 46: foot, 48: fixed part, 50: illuminating part, 52: light source cell, 54: the space, 56: air hole, 60: spacer pin, 62: through hole, 64: overlayer, 66: transparent base, 68: output face, 70: reflecting part, 72: light-emitting component, 74R, 74G, 74B: light emitting source, 75: support, 76: baseplate part, 77: reflecting surface, 78: first surface portion, 80: the first light, 82: second surface portion, 84: the second light, 86: light emitting control portion, 88: the color adjustment part, 90: deviation is adjusted circuit, the 92:DC/DC converter, 93: power supply, 94: output regulation circuit, 96: control circuit of duty ratio, the 98:RGB control circuit of duty ratio, 100: color is adjusted circuit, 102R, 102G, 102B: transistor, 104R, 104G, 104B: variable resistor, 110: liquid crystal panel, 112: backlight apparatus, 114: preceding frame, 116: the transmittance section, 118: polaroid, 120: the front side diffusion sheet, 122: the rear side diffusion sheet, 124: diffuser plate, 126: after-frame, 128: base portion, 130: support, 132: the space, 134: cold-cathode tube, 136: supporting station, 138: the lamp supporting station, 140: spacer pin, 142: inverter
Embodiment
Below, with reference to description of drawings preferred forms of the present invention.In addition, in the following description, suitably used the expression prescribed direction term (for example " on ", D score, " right side ", " left side ") and contain other terms (for example " top ", " below ", " right side ", " left side ") of these terms, yet these terms are in order to understand the present invention with reference to accompanying drawing easily, and can't help these terms and limit the technical scope of invention.Therefore, below Shuo Ming embodiments of the present invention spin upside down, perhaps among the form of any direction (for example clockwise direction or counterclockwise) rotation predetermined angular (for example 90 degree) also belongs to technical scope of the present invention.
Fig. 1 is the sectional view of liquid crystal indicator, and illustrated liquid crystal indicator 10 has liquid crystal panel 12 and is configured in this liquid crystal panel 12 backlight apparatus 14 behind.Liquid crystal panel 12 can utilize known in the past all liquid crystal panels, and can't help the kind of liquid crystal and panel construction and limit liquid crystal indicator of the present invention.
32 the inside in the space, lamination disposes the big a plurality of light-passing boards of ratio open portion 26 near peristome 26.In embodiment, a plurality of light-passing boards from the bottom of after-frame 20 towards liquid crystal panel 12 have the transparent panel with independence (support plate) 34 that constitutes by hard transparent material successively, the diffusion sheet (proliferation part) 36 of the soft sheet of the light diffusion that makes incident, the polarization plates 38 that only light component to specific direction vibration seen through, as shown in Figure 1, kept by sidewall 30 clampings of the lip portions 24 of preceding frame 18 and after-frame 20.
32 bottom disposes light source portion 40 in the space.Light source portion 40 has a plurality of illuminating part mounted boards 42 of supporting a plurality of illuminating parts described later.In embodiment, a plurality of illuminating parts carry base portions 42 along the plane parallel with liquid crystal panel 12 and peristome 26, are laid in the roughly whole zone in the space 32.Each illuminating part carries base portion 42 to be represented in detail as Fig. 4, by a sheet material warpage is formed, comprise: rectangular base plate 44, it has one side (minor face) of the length of cutting apart equably with one side (long limit) of the short side direction same length length of coffin 32 with the length of the long side direction of coffin 32; Foot 46, it is with the part of two minor faces of base plate 44 warpage and forming downwards; Fixed part 48, it is with the remainder of two minor faces of base plate 44 warpage and forming upward.
Clathrate ground disposes a plurality of illuminating parts 50 and is formed with light source cell 52 on each illuminating part mounted board 42.The back explains, each illuminating part 50 has the tabular outward appearance of quadrilateral, on the surperficial whole zone of base plate 44 or roughly whole zone, the gap is not set between adjacent illuminating part 50, (for example the gap is less than or equal to about 5mm perhaps to separate the gap between adjacent illuminating part 50 slightly, it is desirable to be less than or equal to about 2mm, preferably be less than or equal to about 1mm) and fix.The fixing means of illuminating part 50 is any, for example can utilize screw, sticker, two-sided sticky material.For example, when illuminating part 50 has the planar dimension of 30mm in length and breadth, and adjacent illuminating part 50 between separate the gap configuration of about 1mm.In addition, the situation of the backlight apparatus of 30 inches types for example, on each illuminating part mounted board 42, the illuminating part 50 with planar dimension of 30mm is in length and breadth gone up and three of row arrangement, is gone up and 13 of row arrangement in the direction (second direction) with this direction quadrature at base plate short side direction (first direction).Like this, seven illuminating part mounted boards 42 that are equipped with illuminating part 50 are formed the face light emitting source by planar configuration as shown in Figure 3.
Dismounting links the fixed part 48 of each illuminating part mounted board 42 freely and is fixed on the sidewall 30 of after-frame 20 by screw etc. to be configured in a plurality of light source cells 52 in the space 32.In addition, between light source cell 52 and after-frame bottom 28, owing to the existence of foot 46 is formed with the space 54 with specific thickness.This space 54 not only is used as the space that electric wiring is used, and is utilized that work is connected with outer gas by air hole (peristome of ventilation usefulness/heat transmission) 56 (with reference to the Fig. 1) that are formed at after-frame bottom 28 and with the space of the hot driving of illuminating part 50 generations.
Return Fig. 1, in the present embodiment, prevent its deflection in order to support three light-passing boards (transparent panel 34, diffusion sheet 36, polarization plates 38) from behind, 32 internal configurations has a plurality of spacer pins 60 in the space.Spacer pin 60 is made of the axial region of the discoid base portion and the front end taper shape of stretching out upward from the center of base portion, be configured on the after-frame bottom 28, and remain on the through hole 62 that is formed on the illuminating part lift-launch base portion 42 from its below with the axial region insertion, under this state, end bearing light-passing board on the axial region.As shown in Figure 3, these a plurality of spacer pins 60 preferably are configured in the central authorities that illuminating part 50 are divided into each zone of four parts.Wherein, the rigidity height of or light-passing board 34 little at peristome 26 does not produce the situation of deflection on light-passing board, even perhaps it does not constitute the situation of the degree of problem yet for example producing deflection, do not need configuration space pin 60.
As Fig. 5 and shown in Figure 6, illuminating part 50 forms the tabular outward appearance with foursquare flat shape, has the foursquare surface relative with liquid crystal panel 12.This surface is by forming by having the overlayer 64 that roughly certain thickness transparent panel constitutes.Under overlayer 64, schematically be wholely set transparent base 66 downwards with crooked dish shape bottom surface.Transparent base 66 is made of the transparent resin one, and the face that contacts with transparent component of overlayer 64 forms outgoing plane 68, and the bottom surface supporting of transparency carrier 66 has the reflecting part (light guide part) 70 of high reflectance.Reflecting part 70 for example on the bottom surface of transparent base 66 evaporation metal form.Near the center bottom of transparent base 66, imbedded light-emitting component 72.In the present embodiment, light-emitting component 72 has the redness of ejaculation, green, three light emitting sources (red diode, green diode, blue diode) 74R, the 74G of blue light, 74B, penetrates red, green, blue light from these three light emitting sources.Be provided with the support 75 that is used to support transparent base 66 in the behind of reflecting part 70.This support 75 can be with resin molded and be formed on the behind of reflecting part 70.In addition, dispose baseplate part 76 in the behind of support 75.
The bottom surface of transparent base 66 forms a plurality of reflectings surface 77 with respect to the centres configuration of illuminating part 50, and along these reflecting surface 77 configuration reflecting parts 70, thus, the light that penetrates from light-emitting component 72 all vertically or generally perpendicularly penetrates to liquid crystal panel 12.Particularly, if advancing of Mingguang City specifically, then as shown in Figure 6, from the light that light-emitting component 72 penetrates, with first light 80 injected to the first surface portion (light guide part) 78 of outgoing plane 68 less than the incident angle of the cirtical angle of total reflection towards the transmittance section and liquid crystal panel 12 vertically or generally perpendicularly penetrate.In addition, from the light that light-emitting component 72 penetrates, carry out internal reflection to second light 84 of second surface portion (light guide part) 82 incidents of outgoing plane 68 at outgoing plane 68 with incident angle more than or equal to critical angle.Internal reflection second light 84 reflect by reflecting surface 77 (being reflecting part 70 definitely) again, afterwards, with less than the incident angle of critical angle once more to outgoing plane 68 incidents, from the second surface portion 82 of outgoing plane 68 towards the transmittance section and liquid crystal panel 12 perpendicular or generally perpendicularly penetrate.In addition, as the enforcement mode, have light emitting source 74R, the 74G that produces three coloured light, the device of 74B can become white light fully suitably with three kinds of light colour mixtures by outgoing plane 68 and reflecting part 70 reflections.The shape of decision reflecting surface 77 is to guarantee advancing of such light.
By adopting such structure, planar configuration is at a plurality of illuminating parts 50 of after-frame 20 inside, constitutes the area source that penetrates or light beam that approximate vertical advance vertical towards diffusion sheet 36 and liquid crystal panel 12 as a whole.The light transmission transparent panel 34 that penetrates from area source is by after diffusion sheet 36 diffusions, makes only to have by polarization plates 38 to the high brightness of the composition of specific direction vibration and not have the face of brightness disproportionation luminous by peristome 26, supplies with to liquid crystal panel 12.
Therefore, backlight apparatus 14 according to embodiment, have the illuminating part 50 no gaps of tetragonal outgoing plane 68 or separate small gap and configuration in length and breadth, all vertically or generally perpendicularly advance towards diffusion sheet 36 and liquid crystal panel 12 from the light that each illuminating part 50 penetrates.Therefore, light source portion 40 forms roughly uniform surface light source, and the uniform beam (face light beam) that penetrates from this area source passes through diffusion sheet 36, thereby it is luminous to obtain uniform more face.
In addition, the light that penetrates from light source portion 40 all forwards (towards the direction of diffusion sheet 36, liquid crystal panel 12) is advanced, because unlike cold-cathode tube, spread to omnirange, so need not to be formed for the light reflection of will rearward advance and the space of reclaiming in the behind of illuminating part 50, as a whole, thickness that can attenuate backlight apparatus 14.In addition, can effectively utilize the light that penetrates from light source portion 40 by the utmost point.
In addition, vertically or generally perpendicularly inject to diffusion sheet 36 from the light that light source portion 40 penetrates, relative diffusion sheet 36 is injected the light with so-called direction composition unlike the backlight apparatus that has used cold-cathode tube.Therefore, can omit the diffusion sheet 36 that is used for the light diffusion that to penetrate from light source portion 40.In addition, even be suitable for the situation of diffusion sheet 36, compare with the backlight apparatus that has used cold-cathode tube, also can reduce it and use number, if as the enforcement mode, dispose hard transparent plate 34 rearward, then can on diffusion sheet 36, utilize the diffusion sheet of the non-independence that constitutes by soft material with independence.At this moment, transparent panel 34 is compared obviously cheap with the diffusion sheet 36 of the independence that is made of hard material, so can further reduce the cost of backlight apparatus.
In addition, because a plurality of illuminating parts 50 are equipped on a plurality of illuminating part mounted boards 42, so the replacing when carrying out the assembling of light source portion 40 and illuminating part fault easily etc. is operated.
Electrical system about backlight apparatus 14 describes.As shown in Figure 1, 2, be provided with light emitting control portion 86 and color adjustment part 88 in the behind of after-frame 20.Represent in detail as Fig. 7, be connected in series according to each illuminant colour at light emitting source (light emitting diode) 74R, 74G, the 74B of a plurality of (in the above-mentioned embodiment being three) illuminating parts 50 of each illuminating part mounted board 42 upper edge first directions configurations.This is electrically connected by being formed at illuminating part mounted board 42 space 54 behind and is undertaken.
In light emitting control portion 86, a plurality of light emitting source 74R that are connected in series, 74G, 74B adjust circuit (light quantity adjustment part) 90 with a deviation and are connected, and these a plurality of light emitting source 74R that are connected in series, 74G, 74B can carry out the brightness adjustment as a unit.Deviation is adjusted circuit 90 and also is connected with power supply 93 by DC/DC converter 92.In addition, DC/DC converter 92 is connected with the output regulation circuit 94 of adjusting its output.In addition, the output of DC/DC converter 92 is connected with RGB dutyfactor adjustment circuit (デ ユ one テ イ Tone puts in order the loop) 98 by control circuit of duty ratio (デ ユ one テ イ system is driven the loop) 96, according to the dutycycle (duty cycle range of setting by RGB dutyfactor adjustment circuit 98 (オ Application デ ユ one テ イ): 2～100%), control circuit of duty ratio 96 is adjusted the output duty cycle of DC/DC converter 92, carries out the light modulation of light source portion 40 integral body.
In addition, the heat that is produced by light-emitting component 72 is emitted to the outside by air hole 56 from being formed at its space 54 behind.Therefore, the temperature characterisitic of light-emitting component 72 is stable.
More than, the preferred forms of liquid crystal indicator of the present invention and backlight apparatus has been described, but this embodiment can carry out various improvement.For example, as shown in Figure 1, form the reflection horizon 106 of highly reflective, by the light reflection that will penetrate from light source portion 40 and can effectively apply flexibly at the inner face (the particularly inner face of sidewall 30) of after-frame 20.At this moment, reflection horizon 106 can stick to side wall inner surface and form by the reflector plate that will have highly reflective, also can form by the coating of coating highly reflective.In addition, in the above-described embodiment, on light-emitting component, used three light emitting sources (producing three light emitting diodes red, green, blue light respectively), but also can constitute light-emitting component by a light emitting source.In addition, only represented a form of illuminating part in the above-mentioned explanation, the spy opens the illuminating part (illuminating source) of various forms of 2004-186092 communique motion also applicable to the present invention.
Claims (8)
1. backlight apparatus, its be under mode, proliferation part and the light source portion that is configured in the behind of above-mentioned proliferation part with sheet of diffusion light, the light diffusion that to penetrate from above-mentioned light source portion by above-mentioned proliferation part and the face that obtains is luminous, above-mentioned light source portion has a plurality of illuminating parts along the planar configuration parallel with above-mentioned proliferation part, and above-mentioned a plurality of illuminating parts comprise respectively: the base material that is made of translucent material with outgoing plane relative with above-mentioned proliferation part; Imbed the light-emitting component of the inside of above-mentioned base material; The light that will be produced by above-mentioned light-emitting component is from the light guide part of above-mentioned outgoing plane to the regional guidance relative with above-mentioned outgoing plane of above-mentioned proliferation part; It is characterized in that above-mentioned smooth guide part comprises:
First surface portion, it is formed on the above-mentioned outgoing plane, to directly inject with incident angle from first light that above-mentioned light-emitting component penetrates, and will penetrate to the zone of the above-mentioned relatively outgoing plane of above-mentioned proliferation part with first light of directly injecting less than the incident angle of above-mentioned critical angle less than critical angle;
Second surface portion, it is formed on the above-mentioned outgoing plane, will directly inject with the incident angle more than or equal to critical angle from second light that above-mentioned light-emitting component penetrates, simultaneously will be with second light injected more than or equal to the incident angle of above-mentioned critical angle to internal reflection;
Reflecting part, it is formed on the surface of above-mentioned base material, will be by above-mentioned second surface portion to second light reflection of internal reflection and to inject above-mentioned second surface portion less than the incident angle of critical angle, then, penetrate to the zone of the above-mentioned relatively outgoing plane of above-mentioned proliferation part from above-mentioned second surface portion.
2. backlight apparatus as claimed in claim 1 is characterized in that, the outgoing plane of above-mentioned illuminating part has the flat shape of rectangle.
3. backlight apparatus as claimed in claim 1 or 2 is characterized in that, above-mentioned smooth guide part has the light reflection that will penetrate from above-mentioned light-emitting component and to the reflecting part of the regional guidance relative with above-mentioned outgoing plane of above-mentioned proliferation part.
4. backlight apparatus as claimed in claim 1 or 2, it is characterized in that, be formed with the gap between at least two adjacent illuminating parts in above-mentioned a plurality of illuminating parts, in above-mentioned gap, dispose the pin that extends and support above-mentioned proliferation part from above-mentioned illuminating part towards the direction of above-mentioned proliferation part.
5. backlight apparatus as claimed in claim 1 or 2, it is characterized in that, above-mentioned light source portion has a plurality of illuminating part mounted boards with above-mentioned proliferation part configured in parallel, and above-mentioned illuminating part is being configured in first direction and along on the second direction of above-mentioned plane and above-mentioned first direction quadrature on the above-mentioned illuminating part mounted board.
6. backlight apparatus as claimed in claim 5 is characterized in that, is configured in a plurality of illuminating parts and a corresponding light quantity adjustment part connection on the above-mentioned first direction on above-mentioned illuminating part mounted board.
7. backlight apparatus as claimed in claim 1 or 2 is characterized in that, above-mentioned light-emitting component has three light emitting sources of the redness of penetrating, green, blue light.
8. a liquid crystal indicator is characterized in that, has the liquid crystal panel that each described backlight apparatus of claim 1～7 and projection have the light that penetrates from the proliferation part of above-mentioned backlight apparatus.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP304498/04 | 2004-10-19 | ||
| JP2004304498A JP2006120355A (en) | 2004-10-19 | 2004-10-19 | Backlight device and liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1763607A CN1763607A (en) | 2006-04-26 |
| CN100443986C true CN100443986C (en) | 2008-12-17 |
Family
ID=36538070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101138518A Expired - Fee Related CN100443986C (en) | 2004-10-19 | 2005-10-19 | Backlight lamp device and liquid crystal display device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2006120355A (en) |
| KR (1) | KR100719737B1 (en) |
| CN (1) | CN100443986C (en) |
| TW (1) | TW200628922A (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007311561A (en) * | 2006-05-18 | 2007-11-29 | Showa Denko Kk | Display unit, light emitting device, and solid-state light emitting element substrate |
| KR100799869B1 (en) * | 2006-06-29 | 2008-01-31 | 삼성전기주식회사 | SYSTEM FOR DRIVING LCD BACKLIGHT COMPRISING LEDs |
| KR20080001050A (en) * | 2006-06-29 | 2008-01-03 | 삼성전기주식회사 | System for driving lcd backlight comprising leds |
| CN101438629A (en) * | 2006-07-24 | 2009-05-20 | 夏普株式会社 | Back light device, and display device using same |
| JP4711916B2 (en) * | 2006-09-07 | 2011-06-29 | シャープ株式会社 | LIGHT EMITTING DEVICE AND DISPLAY DEVICE USING THE LIGHT EMITTING DEVICE |
| KR100786096B1 (en) * | 2006-09-26 | 2007-12-21 | 엘지전자 주식회사 | Back light unit and printed circuit board therefor |
| JP4940932B2 (en) * | 2006-12-19 | 2012-05-30 | ソニー株式会社 | Backlight device and liquid crystal display device |
| KR101395059B1 (en) * | 2007-11-29 | 2014-05-14 | 삼성디스플레이 주식회사 | Backlight unit and liquid crystal display having the same |
| JP4364286B1 (en) * | 2008-05-26 | 2009-11-11 | 株式会社東芝 | Electronics |
| KR102553787B1 (en) | 2008-12-19 | 2023-07-11 | 가부시키가이샤 한도오따이 에네루기 켄큐쇼 | Head mounted display device |
| JP5390973B2 (en) * | 2009-07-21 | 2014-01-15 | 株式会社バッファロー | LIGHTING DEVICE, LIGHTING METHOD, AND EXTERNAL STORAGE DEVICE PROVIDED WITH LIGHTING DEVICE |
| WO2011040427A1 (en) * | 2009-09-30 | 2011-04-07 | シャープ株式会社 | Illuminating device, display device and television receiver |
| WO2011080979A1 (en) * | 2009-12-28 | 2011-07-07 | シャープ株式会社 | Lighting device, display device, and television reception device |
| KR102419991B1 (en) * | 2015-07-06 | 2022-07-13 | 삼성전자주식회사 | Back light unit of display apparatus and display apparatus |
| JP6858494B2 (en) * | 2016-05-25 | 2021-04-14 | シチズン電子株式会社 | LED lighting device |
| JP2018123996A (en) * | 2017-01-31 | 2018-08-09 | 東芝ライフスタイル株式会社 | refrigerator |
| CN110942726A (en) * | 2018-09-21 | 2020-03-31 | 深圳光峰科技股份有限公司 | LED display screen |
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| JPH07191311A (en) * | 1993-12-27 | 1995-07-28 | Kokusai Electric Co Ltd | Backlight device for liquid crystal unit |
| JPH11249131A (en) * | 1998-02-27 | 1999-09-17 | Matsushita Electric Ind Co Ltd | Illuminator for display panel, manufacture thereof, view finder using the same and camera |
| JP2000081848A (en) * | 1998-09-03 | 2000-03-21 | Semiconductor Energy Lab Co Ltd | Electronic equipment mounting liquid crystal display device |
| CN1534339A (en) * | 2003-03-31 | 2004-10-06 | 富士通显示技术株式会社 | Surface lighting device and liquid crystal display with the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR940022362A (en) * | 1993-03-09 | 1994-10-20 | 김중헌 | Back light source device for electronic display device |
| KR20000051328A (en) * | 1999-01-20 | 2000-08-16 | 구본준 | Backlight assembly in the thin film transistor type optical sensor |
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2004
- 2004-10-19 JP JP2004304498A patent/JP2006120355A/en not_active Withdrawn
-
2005
- 2005-10-18 KR KR1020050098020A patent/KR100719737B1/en not_active IP Right Cessation
- 2005-10-18 TW TW094136252A patent/TW200628922A/en unknown
- 2005-10-19 CN CNB2005101138518A patent/CN100443986C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07191311A (en) * | 1993-12-27 | 1995-07-28 | Kokusai Electric Co Ltd | Backlight device for liquid crystal unit |
| JPH11249131A (en) * | 1998-02-27 | 1999-09-17 | Matsushita Electric Ind Co Ltd | Illuminator for display panel, manufacture thereof, view finder using the same and camera |
| JP2000081848A (en) * | 1998-09-03 | 2000-03-21 | Semiconductor Energy Lab Co Ltd | Electronic equipment mounting liquid crystal display device |
| CN1534339A (en) * | 2003-03-31 | 2004-10-06 | 富士通显示技术株式会社 | Surface lighting device and liquid crystal display with the same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1763607A (en) | 2006-04-26 |
| KR20060054070A (en) | 2006-05-22 |
| KR100719737B1 (en) | 2007-05-17 |
| TW200628922A (en) | 2006-08-16 |
| JP2006120355A (en) | 2006-05-11 |
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