CN1961179A - Liquid crystal display and backlight device - Google Patents
Liquid crystal display and backlight device Download PDFInfo
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- CN1961179A CN1961179A CNA2005800171875A CN200580017187A CN1961179A CN 1961179 A CN1961179 A CN 1961179A CN A2005800171875 A CNA2005800171875 A CN A2005800171875A CN 200580017187 A CN200580017187 A CN 200580017187A CN 1961179 A CN1961179 A CN 1961179A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133604—Direct backlight with lamps
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133608—Direct backlight including particular frames or supporting means
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/54—Arrangements for reducing warping-twist
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- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
- Securing Globes, Refractors, Reflectors Or The Like (AREA)
Abstract
A backlight device (12) which is arranged at the back of a liquid crystal panel (11) in a liquid crystal display (10) comprises a casing (lamphouse) (13) having an opening portion (16), at least one light source (19) contained in the casing (13), a net (20) covering the opening portion (16), and an optical sheet element (21) arranged on the net (20).
Description
Technical field
The present invention relates to the back-light device that uses in a kind of liquid crystal indicator (Liquid Crystal Display) and this liquid crystal indicator.
Background technology
As the display unit of microcomputer or television receiver and widely used liquid crystal indicator roughly constitute by liquid crystal board or liquid crystal cell and back-light device.Usually, liquid crystal cell by colour filter, two sheet glass substrates, enclose liquid crystal between this two sheet glass substrate, the Polarizer that is arranged on the lateral surface of each glass substrate constitutes.Liquid crystal board right and wrong with structure like this are luminiferous.Therefore, work as display unit, need the exterior lighting light source as back-light device in order to make liquid crystal indicator.
Back-light device is divided into edge-lit and straight-down negative according to its structure.The light source that the edge-lit structure has the LGP that is arranged at the liquid crystal board back side and is oppositely arranged with the edge part of this LGP.The straight-down negative structure is provided with light source and will be from the light of this light source outgoing reflector or the reflecting plate to the liquid crystal board reflection in the inside as the lampshade of framework, will from the light of light source outgoing and by the light of baffle reflection by the printing opacity diffuser plate to liquid crystal board incident.These edge-lits and straight-down negative can be applied in a flexible way according to the desired performance of liquid crystal indicator owing to have intrinsic advantage respectively.For example, the back-light device of straight-down negative is compared with edge-lit because of utilizing the direct sunshine from the light source outgoing, has improved the utilization ratio of light, therefore be applicable to large-scale and the supervision that requires high brightness with purposes such as display unit or television receivers.
Back-light device with reference to Fig. 8 A～Fig. 8 C explanation straight-down negative.As diagram, the framework 113 as lampshade of back-light device 112 becomes the shape that the cross section has roughly trapezoidal tetragonal container, one-body molded by the high reflection level moulding of white (グ レ one De moulding) with synthetic resin, perhaps make with the synthetic resin combination by metallic plate or with metallic plate and moulding.In the inboard of framework 113, be coated with high reflective coating or paste reflector plates such as high reflective film material at the framework inner surface and form reflecting plate 118.In the inside of framework 113, the cylindric light source 119 for thin footpath fluorescent tube (fluorescent lamp) that is made of cold-cathode tube or thermionic-cathode tube is set up in parallel.Electrical connection section that the electrode portion at each cylindric light source 119 two ends is provided with on framework 113 side plates connects and by its supporting, is being held with the spacing of the about 1～2mm in the distance framework back side (bottom surface).Exist as light source and replace the back-light device of cylindric light source 119 with light emitting diode or plane light source, in this back-light device, light source is fixed on the framework back side or the reflecting plate 118.The number of light source or density, all conditions such as distance from framework peristome 116 to light source are determined according to desired brightness.Above framework peristome 116, with the printing opacity diffuser plate 101 of the synthetic resin manufacturing of milky allyl resin or polycarbonate resin etc. to be covered with the state setting of framework peristome 116.Printing opacity diffuser plate 101 has the function that incident light is wherein spread.Therefore, directly or by the reflecting plate in the framework 113 2 reflect, when seeing through printing opacity diffuser plate 101, spread, and it is luminous to be converted to face from the light source 119 radial light that send.In order to make the light that spreads by printing opacity diffuser plate 101, for example, shown in patent documentation 1, on printing opacity diffuser plate 101, optical sheet key element 121 for example light diffusing sheet the 122, the 1st and the 2nd lens 123,124 and polarisation separate sheet 125 are set to liquid crystal board optically focused.In addition, lax in order to prevent printing opacity diffuser plate 101 in the back-light device that size is used above 30 inches liquid crystal indicator shown in patent documentation 2, be provided with a plurality of spacer pins 102 of giving prominence to printing opacity diffuser plate 101 from framework bottom 114.
Patent documentation 1: TOHKEMY 2002-116705 communique
Patent documentation 2: Japanese kokai publication hei 10-326517 communique
So the printing opacity diffuser plate of the existing downward back rear lighting unit of structure contains variety of issue.For example, the printing opacity diffuser plate used of large-scale display device costs an arm and a leg.In addition, the printing opacity diffuser plate absorbs the moisture in the atmosphere at normal temperatures, upwarps laterally towards liquid crystal board, can make it damage to the liquid crystal board stress application.In addition, the transmission losses of the printing opacity diffuser plate of milky allyl resin formation is bigger.Moreover, because of the printing opacity diffuser plate becomes greatly, must between printing opacity diffuser plate and framework, guarantee to absorb the gap that this increase size is used under hot environment or many wet environments.The result, in manufacture process and course of conveying, in case make the back-light device rotation, the position of printing opacity diffuser plate will misplace, the sound of framework can take place to collide, if and apply the place in vibration and use back-light device or liquid crystal indicator, the printing opacity diffuser plate can and then produce attrition powder with the framework friction.And when implementing the gradual change pattern on the printing opacity diffuser plate, the relative position of light source and pattern can stagger, and lamp shadow occurs.In addition, along with the maximization of liquid crystal indicator, the thickness of printing opacity diffuser plate, weight are strengthened.
Summary of the invention
The present invention does for solving these technical problems, in a kind of lighting device rearward, in the behind of optical sheet, uses the technology of net on the parts of this optical sheet of supporting.Particularly, the back-light device that uses in liquid crystal indicator of the present invention and this device has the framework of band peristome, be accommodated at least one light source of framework inside, cover the net of described peristome, be arranged at the optical sheet key element on the described net.
The liquid crystal indicator of other forms of the present invention and back-light device are that described net is for being formed by vertical silk or the horizontal hair braiding that fiber or metal constitute.
The liquid crystal indicator of another form of the present invention and back-light device are that described net is applied in tension force towards a direction at least above described peristome.
The liquid crystal indicator of another form of the present invention and back-light device be, described net is arranged by silk longitudinally or line is arranged or horizontal silk is arranged or line any one in arranging constitutes.
The liquid crystal indicator and the back-light device of a form more of the present invention are, described optical sheet key element has makes light diffusion open the diffusion sheet of directive property with expansion, make light optically focused in the angle of visual field first lens and second lens, see through in the polarisation separate sheet that specific polarized component reflects remaining polarized component simultaneously at least any one.
The effect of invention
Liquid crystal indicator and back-light device with structure like this, because of the net that replaces the printing opacity diffuser plate to use is compared with the printing opacity diffuser plate, quite light, thin and price is low, therefore, can make liquid crystal indicator and back-light device lightweight, slim, low price.In addition,, can not contact, can or not damage this liquid crystal board to this liquid crystal board stress application with liquid crystal board by the optical sheet key element of this net supporting because of working tension on net always.In addition, because of from the light of light source or reflecting plate almost all by the peristome of net, compare with the printing opacity diffuser plate, can make transmission losses suppress lowlyer.Moreover even owing to be in the many wet environments of high temperature, also can keep level and smooth plane, the problem that this gap causes (moving of printing opacity diffuser plate, the generation of unusual sound, the generation of attrition powder) has been removed in necessary gap when need not to install the printing opacity diffuser plate.And,, also can expect the effect same with the gradual change pattern by the weaving manner (for example, the interval of silk or line) of part change net.
Description of drawings
Fig. 1 is the exploded perspective view of liquid crystal indicator of the present invention;
Fig. 2 A is the longitudinal section that is assembled into the back-light device in the liquid crystal indicator shown in Figure 1;
Fig. 2 B is the local amplification view of Fig. 2 A;
Fig. 2 C is the front elevation that the seamless net of tubular is installed in the state on the framework;
Fig. 3 is the local amplification stereogram (Fig. 3 A) of single envelope curve of using in the net; The local amplification stereogram of the double-contracting line that uses in the net (Fig. 3 B), all or be essentially the partial enlarged drawing (Fig. 3 C) of all full supporting (ゾ Star キ) nets with supporting-line (yarn) braiding; Supporting-line and nylon wire be the partial enlarged drawing (Fig. 3 D) of the net of the full support mesh of braiding alternately; Monofilament is woven into the partial enlarged drawing (Fig. 3 E) of lattice type net; The common partial enlarged drawing (Fig. 3 F) of beating the net of hoisting net; The partial enlarged drawing (Fig. 3 G) of the net of beating hoisting net of improvement; Alternately have the banded net part of braiding in a narrow margin and the banded net net partial enlarged drawing (Fig. 3 H) partly of wide cut braiding;
Fig. 4 is the view (Fig. 4 A) of the net enlarged photograph (50 times) before installing; The view (Fig. 4 B) of the net enlarged photograph (200 times) before installing; The view (Fig. 4 C) of the net enlarged photograph after the installation (50 times); The view (Fig. 4 D) of the net enlarged photograph after the installation (200 times);
Fig. 5 A is as the liquid crystal indicator of the embodiment of the invention and the plane of back-light device;
Fig. 5 B is the profile along the C-C line of Fig. 5 A;
Fig. 6 is the figure (Fig. 6 A1) of the Luminance Distribution characteristic of expression net; The figure (Fig. 6 A2) of the Luminance Distribution characteristic of the back-light device of 1 diffusion sheet of coincidence on the net; The figure of the Luminance Distribution characteristic of the back-light device of 4 optical sheets of lamination (Fig. 6 A3) on the net; The figure of the Luminance Distribution characteristic of printing opacity diffuser plate (Fig. 6 B1); The figure (Fig. 6 B2) of the Luminance Distribution characteristic of the back-light device of 1 diffusion sheet of coincidence on the printing opacity diffuser plate; The figure of the Luminance Distribution characteristic of the back-light device of 4 optical sheets of lamination (Fig. 6 B3) on the printing opacity diffuser plate;
Fig. 7 is the visual angle in the back-light device that uses net and the graph of a relation (Fig. 7 A) of brightness rate of change; The visual angle in the back-light device of use printing opacity diffuser plate and the graph of a relation (Fig. 7 B) of brightness rate of change;
Fig. 8 A is the plane of existing liquid crystal indicator;
Fig. 8 B is the profile along the B-B line of Fig. 8 A;
Fig. 8 C is the profile along the C-C line of Fig. 8 A.
Description of reference numerals
10: liquid crystal indicator; 11: liquid crystal board; 12: back-light device; 13: framework; 16: peristome; 18: reflecting plate; 19: cylinder light source (fluorescent lamp); 20: net; 21: the optical sheet key element; 22: diffusion sheet; 23: the 1 lens; 24: the 2 lens; 25: the polarisation separate sheet.
The specific embodiment
Below, with reference to the embodiment of description of drawings back-light device of the present invention and liquid crystal indicator.In the following description, for the ease of understanding invention, use " left side ", " right side ", " on ", the term of D score etc. and derive from language, but these terms only indicate the direction of structure represented on the drawing.In addition, in the accompanying drawings, the part of identical symbolic representation is identical or similar part.
Fig. 1 illustrates a plurality of key elements that constitute liquid crystal indicator 10 of the present invention.As diagram, liquid crystal indicator 10 has liquid crystal board 11, is arranged at liquid crystal board 11 back-light device 12 behind.Liquid crystal board 11 is for utilizing liquid crystal, known rectangular liquid crystal cell.Back-light device 12 has the framework 13 with the roughly onesize square container shapes of liquid crystal board 11.Framework 13 constitutes is taken in the lampshade of usefulness with a plurality of lamps of following explanation, has rectangular backplate (base plate) 14, respectively from the upper end of backplate 14, lower end, two ends, the left and right sides frame part 15U of outstanding top, bottom, left part and right part forwards, 15D, 15L 15R is at these frame parts 15U, 15D, 15L, the inboard of 15R forms peristome 16.Left and right sides frame part 15L, the inboard of 15R is provided with the light source support 17 that extends down up.Inboard in framework 13 is provided with reflecting plate 18 near backplate 14.End about reflecting plate 18 respectively laterally and oblique inclination towards peristome 16, thus, from the light of light source outgoing described later effectively towards liquid crystal board 11.Similarly, shown in clear among Fig. 2 C, also respectively towards frame part 15U up and down, the front end of 15D tilts laterally and obliquely in the end up and down of preferred reflecting plate 18, from the light of light source outgoing described later effectively towards liquid crystal board 11.About light source support 17 between, be provided with at certain intervals towards horizontal direction and at above-below direction as the fluorescent lamp 19 of one or more cylinder light sources.The both ends of each fluorescent lamp 19 are passed in the lamp through hole of the inclined end portion formation of reflecting plate 18, and the electric power loop (not shown) that is provided with the behind of these inclined end portion is connected.
The peristome 16 of framework 13 is covered by net 20 and the optical sheet key element 21 as optical adjusting member that is arranged on the net 20.Net 20 is fixed on the framework 13 by suitable method with optical sheet key element 21, together constitutes back-light device 12 with framework 13.And lighting device 12 tops are provided with and are fixing liquid crystal board 11 rearward, to constitute liquid crystal indicator 10.Optical sheet key element 21 preferably is made of one or more optical sheets.In embodiment, in a plurality of optical sheets, include the diffusion sheet 22 that makes the light diffusion and open up wide directive property, first lens 23 and second lens 24 that makes light optically focused in the visual angle, see through the polarisation separate sheet 25 that specific polarized component reflects remaining polarized component simultaneously, these optical sheets form with above-mentioned sequential laminating on net 20.
Structure with reference to Fig. 2 A～Fig. 2 C and Fig. 3 A～Fig. 3 H explanation net 20.The net 20 suitably yarn braiding of size forms.The yarn example of using in net 20 is by shown in Fig. 3 A and Fig. 3 B.Fig. 3 A illustrates single envelope curve, and it is that coiling one deck is that the envelope curve 27 of main material forms with nylon on the monofilament 26 that is main material with the polyurethanes.Fig. 3 B illustrates the double-contracting line, and reeling two-layer on the monofilament 28 that with the polyurethanes is main material is that the envelope curve 29 and 30 of main material forms with nylon.Yarn can be transparent, also can have color (for example, white or other colors) arbitrarily.In addition, the size of yarn is approximately 5～200 dawn Buddhist nuns, preferably selects in about 20～30 dawn Buddhist nuns' scope.In addition, " dawn Buddhist nun " is the rugosity unit of silk, is the gram number of every 9000m.
Net 20 can be utilized the cloth that is made into by any braiding.For example, the net cloth shown in Fig. 3 C is for all or roughly all by supporting-line (yarn) the 31 full supportings that are woven into (ゾ Star キ).Cloth shown in Fig. 3 D is with the alternately full supporting of braiding of two kinds of silks (for example supporting-line 32 and nylon yarn 33).The net cloth of Fig. 3 E forms for for example nylon, polyethylene, polyacrylic monofilament 34 are woven into lattice type knitmesh shape.Fig. 3 F is the common net cloth of beating strand net 35 that horizontal hair passes the vertical peak-to-peak crack of twisting thread at certain intervals.Fig. 3 G is the net cloth of beating strand net 36 of so-called improvement.
The monofilament to replace envelope curve of available nylon 100% forms the net cloth shown in Fig. 3 C～Fig. 3 E.In addition, silk needs not to be the silk of natural fiber or chemical fibre, can use for example copper, steel, stainless fine rule.In addition, the net that also can use filament and metal wire combined knitting to form.In addition, net needs not to be the cloth of braiding, can be with about being provided with around for example framework peristome 16 and up and down frame, opposed left and right sides frame or opposed upper and lower frames or these frames between the two with less interval with filament or metal wire side by side the tensioning setting form.That is to say that in the present invention, the term of " net " should be understood to also include horizontal (perhaps vertical) and exists under the state of minim gap, an arrangement (configuration) or the line arrangement (line configuration) of disposing many silks or line in vertical (or laterally).
Shown in Fig. 3 H, the net 20 that also can use the banded net part 38 of extending at the length direction of fluorescent lamp 19, weave to replace by the big width of banded net part 37 and silk and the gap of silk of little narrow in the silk and the gap of silk apart from braiding.At this moment, in the time of banded net part by narrow distance is set on the fluorescent lamp 19 37, the banded net part 38 of width is set on the zone between the fluorescent lamp 19 that is in adjacency, can suppresses thus from the high brightness of the light of fluorescent lamp 19 direct outgoing.
Net 20 is fixed on the framework 13 by suitable method.For example, the net shown in Fig. 3 C～Fig. 3 H is arranged on the peristome 16, applies under the state of certain tension force on left and right directions or above-below direction or both direction, be fixed in length and breadth and frame part 15U up and down, and 15D, 15L is on the 15R.At this moment, be fixed to frame part 15U, 15D, 15L is on the part of net in length and breadth on 4 limits on the 15R, for example as shown in Figure 1, preferably by adhesive securement or sew on cloth or the banded fixed part 39 of resin, these fixed parts 39 are fixed to frame part 15U, 15D by suitable method such as bonding agent or U sprig, 15L is on the 15R.Like this, by net 20 is applied certain force of strain on the both direction of left and right directions or above-below direction or these directions, the net 20 that tensioning can be arranged on peristome 16 maintains the flat state that does not have wrinkle.
Also can utilize the seamless net that is woven into tubular.At this moment, shown in Fig. 2 C, the tubular net is from laterally being encapsulated on the framework 13, partly to apply the state of certain tension force and fix being positioned at net on the peristome 16 on the both direction of above-below direction or left and right directions or these directions.In the case, if for example utilize, under common flat form (flat condition that does not stretch), the tubular net of half width D of pact with above-below direction length 2D of framework 13, then this tubular net stretches under the state that is installed on the framework 13 2 times approximately, and direction stably applies roughly tension force uniformly up and down.
As above-mentioned, net 20 usefulness filaments or metal wire constitute, and its thickness is very little, roughly about 0.2mm.With respect to this, replace net 20 of the present invention with the existing printing opacity diffuser plate that uses, then it is compared with net, has sizable thickness.For example, on the back-light device of 10.4 inches types, the existing printing opacity diffuser plate that uses has the thickness of 1.7mm.Therefore, compare with the back-light device that uses the printing opacity diffuser plate (thickness is 24mm), back-light device of the present invention can reduce its thickness 1.5mm (6%).
In addition, the printing opacity diffuser plate is formed by synthetic resin.For this reason, the printing opacity diffuser plate used of the back-light device of 10.4 inches types has the weight of 64.3g.With respect to this, the weight of the net of using in the unidimensional back-light device 20 as 1.5g about.Therefore, use the weight of the back-light device of printing opacity diffuser plate to be 485.6g, and use the weight of the back-light device of net to be 422.8g, can realize 13% lightweight.
Fig. 4 is the net enlarged photograph with the reality that constitutes shown in Fig. 2 C.Particularly, Fig. 4 A and Fig. 4 B are for amplifying 50 times, 200 times photo respectively with the part of the net of non-installment state (not applying the state of tension force).Fig. 4 C and Fig. 4 D amplify 50 times, 200 times photo respectively with the part of the net of installment state (applying tension state).Shown in Fig. 4 D, the mesh of the net in the installment state has the size of 0.645mm at the length direction of fluorescent lamp 19 (shown in the arrow X laterally), has the size of 1.266mm in the direction (above-below direction shown in the arrow Y) perpendicular to fluorescent lamp.The silk footpath is 0.075mm, and at this moment, the aperture opening ratio of net is about 82%.
Embodiment
Fig. 5 A and Fig. 5 B illustrate the liquid crystal indicator and the back-light device of 10.4 inches types.Framework 13 has rectangular flat shape, is processed by aluminium sheet.In the inside of framework 13, the cold-cathode tube 3 that 8 diameters are 3mm is towards the long side direction of framework 13, and at short side direction with the parallel at prescribed intervals setting.Reflecting plate 18 is along the inner face setting of framework 13.In order to improve reflection efficiency, the end 18U up and down of reflecting plate 18,18D, 18L, 18R tilts laterally towards peristome 16, and shown in Fig. 5 B, the cross section of reflecting plate 18 is trapezoidal.The electrode of the fluorescent lamp 19 that is provided with in the behind of the reflecting plate inclined end portion of the left and right sides is electrically connected with the inverter loop 40 of the behind setting of plate 14 overleaf.
Be arranged at liquid crystal board 11 optical sheet key element 21 behind by diffusion sheet the 22, the 1st lens the 23, the 2nd lens 24, polarisation separate sheet 25 sequentially lamination form.Net 20 is arranged at the rear side of optical sheet key element 21.These liquid crystal boards 11, optical sheet key element 21, net 20 are surrounded to constitute as board component by metal system or plastic maintenance framework 41 with carriage shape (コ font) cross section.And board component is arranged at the 15U of frame part up and down with framework 13,15D, and 15L, the peristome side end (upper end) of 15R extends on the flange 42 that forms laterally, and is fixed on the framework 13 by fixed frame 43.In the present embodiment, net 20 be applied on the both direction of left and right directions or above-below direction or these directions certain tension force, with around 4 limits (about longitudinal edge portion and transverse edge portion up and down) cover under the state of liquid crystal board 11 and optical sheet key element 21 peripheries, be fixed on the maintenance framework 41.
To shown in Fig. 5 A and Fig. 5 B, 10.4 inches full run-down type back-light device A1 and liquid crystal indicator, and existing back-light device B1 and the liquid crystal indicator of the same type that use milky propylene synthetic resin system printing opacity diffuser plate as proliferation part replacement net with 1.7mm thickness, measure mean flow rate and X, the colourity of Y direction.In both liquid crystal indicators, the supply voltage of back-light device is 12v, and source current is 1.32A, and consumption electric power is 15.85W.
Table 1 illustrates for only net being arranged at the back-light device A1 on the framework and only the printing opacity diffuser plate being arranged at back-light device B1 on the framework, respectively on the net and the mean flow rate of measuring on the printing opacity diffuser plate.
[table 1]
Table 1: mean flow rate and average brightness ratio
| A1 | B1 | A1/B1(％) | |
| Mean flow rate (cd/m 2) | 3,376.1 | 3,627.7 | 93.1 |
Table 2 illustrates at the back-light device A2 that net and a slice printing opacity diffusion sheet are set on the framework with the printing opacity diffuser plate is set and the back-light device B2 of a slice printing opacity diffusion sheet, the mean flow rate of measuring respectively on the printing opacity diffusion sheet on framework.
[table 2]
Table 2: the characteristic of back-light device
| A2 | B2 | A2/B2(％) | |
| Mean flow rate (cd/m 2) | 4,475.5 | 4,494.5 | 99.6 |
Table 3 illustrate for the back-light device A3 that net and 4 optical sheets (diffusion sheet, the 1st and the 2nd lens, polarisation separate sheet) are set on the framework and on framework the back-light device B3 of configuration printing opacity diffuser plate and same 4 optical sheets, mean flow rate of on the optical sheet of the top, measuring and central portion colourity and the central brightness relevant with the Y direction respectively with X.
[table 3]
Table 3: the characteristic of back-light device
| A3 | B3 |
| *1 brightness ratio: A3/B3 (%) *2 colour differences: A3-B3 | |||
| Mean flow rate (cd/m 2) | 4,749.1 | 4,514.1 | *1 105.2 |
| Average chrominance X | 0.3492 | 0.3536 | *2 -0.0044 |
| Average chrominance Y | 0.3298 | 0.3372 | *2 -0.0074 |
| Central brightness (cd/m 2) | 5,402.1 | 5,174.1 | *1 104.4 |
| The colourity X of central authorities | 0.3471 | 0.3515 | *2 -0.0044 |
| The colourity Y of central authorities | 0.3275 | 0.3354 | *2 -0.0079 |
According to table 1～table 3 as can be known, compare with the back-light device B that the multi-disc optical sheet is overlapped on the printing opacity diffuser plate, the back-light device A that the multi-disc optical sheet is overlapped on net can obtain higher brightness.In addition, for the back-light device A that uses net, the colourity drift towards yellow (Y) direction during the lamination optical sheet is compared with the back-light device B that uses the printing opacity diffuser plate, will lack obviously.
Fig. 6 A1 and Fig. 6 B1 illustrate the Luminance Distribution characteristic of net and printing opacity diffuser plate respectively.Fig. 6 A2 illustrates the Luminance Distribution characteristic curve that overlaps the back-light device of 1 diffusion sheet on the net, and Fig. 6 B2 is illustrated in the brightness distribution curve that overlaps the back-light device of 1 diffusion sheet on the printing opacity diffuser plate.In addition, Fig. 6 A3 illustrates the Luminance Distribution characteristic curve of the back-light device of 4 optical sheets of lamination on the net (diffusion sheet, the 1st and the 2nd lens, polarisation separate sheet), and Fig. 6 B3 is illustrated in the brightness distribution curve of the back-light device of same 4 optical sheets of lamination on the printing opacity diffuser plate.According to these figure as can be known, the Luminance Distribution of net and printing opacity diffuser plate and the Luminance Distribution that overlaps the back-light device of 1 diffusion sheet on these nets and printing opacity diffuser plate exist inhomogeneities, but the Luminance Distribution of the back-light device of 4 optical sheets of lamination on net is roughly same degree with the Luminance Distribution of the back-light device of 4 optical sheets of lamination on the printing opacity diffuser plate.
Fig. 7 A illustrates the relation of the angle of visual field and brightness rate of change in the back-light device that uses net.And Fig. 7 B illustrates the relation of the angle of visual field and brightness rate of change in the back-light device that uses the printing opacity diffuser plate.In these figure, the characteristic curve when symbol 50a represents only to use net, symbol 50b represent only to use the characteristic curve on the printing opacity diffuser plate.Characteristic curve when the characteristic curve when symbol 51a represents to use net and 1 diffusion sheet, symbol 51b are represented to use printing opacity diffuser plate and 1 diffusion sheet.Characteristic curve when the characteristic curve when symbol 52a represents to use net and 4 optical sheets (diffusion sheet, the 1st and the 2nd lens, polarisation separate sheet), symbol 35b represent to use printing opacity diffuser plate and same 4 optical sheets.
According to these figure as can be known, at first, with the characteristic of net and printing opacity diffuser plate relatively the time,, therefore demonstrate the angle of visual field broader than printing opacity diffuser plate because of net sees through roughly all light of normal direction.Then, when overlapping 1 diffusion sheet, net is compared with the combination of diffusion sheet with the printing opacity diffuser plate with the combination of diffusion sheet, demonstrates the broader angle of visual field.Next, when overlapping 4 optical sheets, the combination of net and optical sheet is compared with the combination of optical sheet with the printing opacity diffuser plate, and the angle of visual field narrows down slightly, but can remove the secondary lobe (サ イ De ロ one Block) (illustrating with symbol 53b in Fig. 7 B) because of lens causes.Therefore, can understand, use the back-light device of net to have identical quality with the back-light device that uses the printing opacity diffuser plate.
For the back-light device A4 of 4 optical sheets of lamination (diffusion sheet, the 1st and the 2nd lens, polarisation separate sheet) on net and printing opacity diffuser plate respectively, B4, measure the colourity (chromaticity x, chromaticity y) of mean flow rate, radiation beam (radiant flux), light beam (luminous flux), average colour developing evaluation number (general colorrendering index), x direction and y direction.The result who measures is as shown in table 4.
[table 4]
Table 4: the characteristic of back-light device
| A4 | B4 |
| *1 A4/B4(％) *2 A4-B4 | |||
| Mean flow rate (cd/m 2) | 1.470 | 1.336 | *1 110.0 |
| Radiation beam (mW) | 5.000 | 4.841 | *2 159 |
| Light beam (Luminous Flux) | 463.7 | 424.9 | *1 109.1 |
| Number: Ra is estimated in average colour developing | 86.65 | 86.8 | *2 -0.15 |
| Colourity x | 0.3439 | 0.3484 | *2 -0.0045 |
| Chromaticity y | 0.3396 | 0.3447 | *2 -0.0051 |
Shown in these tables, under same electric power supply conditions, use the light beam of the back-light device A4 of net to compare with the back-light device B4 that uses the printing opacity diffuser plate, high approximately by 10%, obviously, the use and the brightness improving of net are closely related.
The effect of above-mentioned net also can be by using treatment technology such as etch processing, the transmittance section (for example opening or window or hyalomere) of given size is formed at reticular lamina that its vertical and horizontal form continuously or the integrally formed reticular lamina that forms in same transmittance section is obtained on the banded or tabular thin slice that molding synthetic resin (for example injection moulding or punch forming) is formed, with this thin slice moulding the time to thin plate.
In addition, in above-mentioned a plurality of embodiment, the lamination that constitutes a plurality of sheet materials of optical sheet key element does not limit in proper order, can suitably change.For example, also lens can be arranged at topmost.In addition, but lamination is organized optical sheet more.Moreover, also can replace optical sheet or together use electromagnetic shielding plate with optical sheet.In addition, net needn't directly be fixed on the framework, also can be fixed to net fixedly on the square framework of usefulness, can be by this frame fixation on framework.
Claims (6)
1, a kind of back-light device has the framework of band peristome, is accommodated at least one light source of framework inside, covers the net of described peristome, is arranged at the optical sheet key element on the described net.
According to the described back-light device of claim 1, it is characterized in that 2, described net is for being formed by vertical silk or the horizontal hair braiding that fiber or metal constitute.
According to claim 1 or 2 described back-light devices, it is characterized in that 3, described net is applied in tension force towards a direction at least above described peristome.
According to the described back-light device of claim 1, it is characterized in that 4, described net is arranged by silk longitudinally or line is arranged or horizontal silk is arranged or line any one in arranging constitutes.
5, according to any one described back-light device of claim 1～4, it is characterized in that, described optical sheet key element have make light diffusion with expansion open directive property diffusion sheet, make light optically focused in the angle of visual field lens, see through in the polarisation separate sheet that specific polarized component reflects remaining polarized component simultaneously at least any one.
6, a kind of liquid crystal indicator is characterized in that, has any one described back-light device of claim 1～5 and the liquid crystal board of the light transmission that will penetrate from described back-light device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004156385 | 2004-05-26 | ||
| JP156385/2004 | 2004-05-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1961179A true CN1961179A (en) | 2007-05-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005800171875A Pending CN1961179A (en) | 2004-05-26 | 2005-05-25 | Liquid crystal display and backlight device |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPWO2005116518A1 (en) |
| KR (1) | KR20070020238A (en) |
| CN (1) | CN1961179A (en) |
| TW (1) | TW200617519A (en) |
| WO (1) | WO2005116518A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777401A (en) * | 2012-10-22 | 2014-05-07 | 乐金显示有限公司 | Wire mesh type diffuser plate and method of fabricating the same, and liquid crystal display device |
| CN104330919A (en) * | 2014-09-11 | 2015-02-04 | 友达光电股份有限公司 | Backlight module with netted diaphragm support |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009006380A2 (en) * | 2007-07-03 | 2009-01-08 | 3M Innovative Properties Company | A backlight assemblies having a transmissive optical film |
| KR100882700B1 (en) * | 2007-07-06 | 2009-02-06 | 엘지이노텍 주식회사 | Receiving device in display device, method of manufacturing the same, and display device having the receiving container |
| US8564730B2 (en) | 2007-07-06 | 2013-10-22 | Lg Display Co., Ltd. | Display device |
| KR100934920B1 (en) * | 2007-11-29 | 2010-01-06 | 한국기계연구원 | Multi Functional Optical Film with Nano-fiber layer and Electrohydrodynamic process thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK0787943T3 (en) * | 1996-02-05 | 2001-10-08 | Erco Leuchten | Reflector amateur with a reflector with at least one rotationally symmetrical or cylindrical reflective surface |
| JP3860753B2 (en) * | 2002-01-08 | 2006-12-20 | 多摩ファインオプト株式会社 | Backlight device |
| JP2004139871A (en) * | 2002-10-18 | 2004-05-13 | Sharp Corp | Lighting system, back light device, and liquid crystal display device |
-
2005
- 2005-05-25 KR KR1020067023995A patent/KR20070020238A/en active IP Right Grant
- 2005-05-25 CN CNA2005800171875A patent/CN1961179A/en active Pending
- 2005-05-25 WO PCT/JP2005/009532 patent/WO2005116518A1/en active Application Filing
- 2005-05-25 JP JP2006513903A patent/JPWO2005116518A1/en not_active Withdrawn
- 2005-05-26 TW TW094117279A patent/TW200617519A/en unknown
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777401A (en) * | 2012-10-22 | 2014-05-07 | 乐金显示有限公司 | Wire mesh type diffuser plate and method of fabricating the same, and liquid crystal display device |
| US9298031B2 (en) | 2012-10-22 | 2016-03-29 | Lg Display Co., Ltd. | Wire mesh type diffuser plate and method of fabricating the same, and liquid crystal display device having the wire mesh type diffuser plate |
| CN103777401B (en) * | 2012-10-22 | 2016-08-24 | 乐金显示有限公司 | Screen mesh type diffuser plate and manufacture method thereof and liquid crystal display |
| CN104330919A (en) * | 2014-09-11 | 2015-02-04 | 友达光电股份有限公司 | Backlight module with netted diaphragm support |
| CN104330919B (en) * | 2014-09-11 | 2017-04-12 | 友达光电股份有限公司 | Backlight module with netted diaphragm support |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2005116518A1 (en) | 2008-04-03 |
| WO2005116518A1 (en) | 2005-12-08 |
| TW200617519A (en) | 2006-06-01 |
| KR20070020238A (en) | 2007-02-20 |
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