CN1860405A - Back light, light guiding plate, method for manufacturing diffusion plate and light guiding plate, and liquid crystal display device - Google Patents

Abstract

The present invention relates to a backlight and a light guide plate, a method of manufacturing a diffuser and the light guide plate, and to a liquid crystal display apparatus, all enabling a cost reduction by reducing the parts count and curtailing unnecessary manufacturing processing. A diffuser 261 has a light distribution layer 181 including a prismatic surface wherein stripe grooves or asperities are arrayed in parallel with each other, a diffusion layer 182 containing diffusion elements 191 for diffusing incident light, and a light incidence control layer 271 including a prismatic surface wherein stripe grooves or asperities are arrayed in parallel on a side of fluorescent tubes 131 . The diffusion layer 182 is formed from the same resin, and only the diffusion elements 191 are formed from a different resin. The prism of the light incidence control layer 271 is optimized so as to enhance the proportion, to light being reflected without entering the light incidence control layer 271 , of light re-entering other parts of a surface of the light incidence control layer 271 , in order to guide incident light toward the diffusion layer 182 efficiently. The present invention is applicable to a backlight of a liquid crystal display apparatus.

Description

Backlight and optical plate, diffusing panel and optical plate preparation method and liquid crystal display

Technical field

The present invention relates to preparation method and liquid crystal display backlight and optical plate, diffusing panel and optical plate.Especially, the present invention relates to the preparation method and the liquid crystal display of backlight and optical plate, diffusing globe and optical plate, they all can both be by reducing number of components and the unnecessary manufacturing process of reduction reduce cost.

Background technology

Liquid crystal display comprises: liquid crystal indicator (being also referred to as the LCD panel), wherein two transparent glass substrates are in alignment with each other overlapping, make their surface face mutually, these surfaces are included in stacked transparency electrode, alignment film thereon etc., and wherein sealing liquid crystal between two substrates; Backlight, be arranged under the liquid crystal indicator, be used for light is provided to liquid crystal indicator; Printed circuit board (PCB) has the circuit that is used to drive liquid crystal indicator; And metal framework, in wherein holding these parts and having liquid crystal window.

Notice that type backlight comprises: wherein such as cold-cathode fluorescence lamp (CCFL) or light emitting diode (LED) along and near the type of the side arrangement of the optical plate that is formed for direct light by lucite; And the type of wherein directly under liquid crystal indicator, arranging in parallel with each other such as the light source of a plurality of cold-cathode fluorescence lamps.In the former, diffusing globe is inserted between optical plate and the liquid crystal indicator, to be transmitted into light diffusion on the LCD equably; And in the latter, diffusing globe is inserted between a plurality of cold-cathode fluorescence lamps and the liquid crystal indicator.

Light source is in the type of the liquid crystal display of the side arrangement of also close optical plate therein, guide by optical plate (also can be called as photoconduction) from the light of light emitted, by the diffusing globe diffusion, carry out the light decentralised control by lens coating, to be transmitted on the liquid crystal indicator.

In the traditional approach, transparent lens coating (also can be called as lens or prism plate) is inserted in liquid crystal indicator and is arranged between the diffusing globe under it, to increase the display brightness in the display device, thereby obtain light and show the LCDs that uniform luminance distributes, the upper surface of the lens coating that this is transparent is a prism surface and lower surface is a smooth surface.

And, used BEF (brightness enhancement film) as a class lens coating widely.Because the light of diffusing globe institute diffusion is focused on to the liquid crystal indicator surface by BEF, so can obtain light and show the LCDs that uniform luminance distributes.The prism surface of lens coating can comprise for example shape of cross section of sawtooth and semi-cylindrical form.

But, by using lens coating to increase display brightness, possible on the display screen owing to ripple (moire) appears in the interference between liquid crystal indicator and the lens coating.In addition, when watching at a slant, display screen may show the corrugated dazzle.

In order to obtain gently and show the LCDs that uniform luminance distributes by increasing brightness backlight, and in order to prevent ripple and dazzle appear on display screen, a kind of technology is disclosed (for example, patent documentation 1), wherein, for example between lens coating and liquid crystal indicator, also be provided with second diffusing globe, the upper surface of this second diffusing globe have the light diffusion effect and lower surface coating by the chemical quenching processing layer.

The open No.3205393 of [patent documentation 1] Jap.P.

To patent documentation 1 disclosed technology be described with reference to figure 1.

Figure 1A is the decomposition diagram backlight of liquid crystal display.Figure 1B is provided with the viewgraph of cross-section of the liquid crystal display backlight shown in Figure 1A along profile line A-A '.Fig. 1 C is the part viewgraph of cross-section at the lens coating shown in Figure 1A and the 1B.

Liquid crystal indicator 21 configurations receive emission from the light that is arranged on backlight 3 on its downside.Be arranged in backlight 3 under the liquid crystal indicator 21 comprise second diffusing globe 1, lens coating 2, first diffusing globe 12, optical plate 13, reverberator 14, as the cold-cathode fluorescence lamp 11 of light source and the frame body 15 that is used to keep them.Frame body 15 is formed by moulding (molding).

Optical plate 13 configurations guide the light by cold-cathode fluorescence lamp 11 emissions, outgoing is (for example as far as possible equably so that light is to the big area of first diffusing globe 12 of (on first diffusing globe, 12 sides) on the surface disposed thereon, it disposes and makes stamp white point on its basal surface, by these white points reflections, light is to 12 outgoing of first diffusing globe thus with the part of the light that allows to be directed).Diffusing globe 12 diffusions are from the light emission of optical plate 13.Reverberator 14 reflects fully from the light of the lower surface transmission of optical plate 13, so that it enters optical plate 13 again.

Lens coating 2 is for example formed by the thick polycarbonate membrane of 0.36mm.Its lower surface (first diffusing globe, 12 sides) is smooth surface 2b, and its upper surface (second diffusing globe, 1 side) provides and have for example prism surface 2a of the shape of cross section shown in Fig. 1 C, and wherein many V-arrangement bar grooves extend parallel to each other and form array.Thereby each V-arrangement bar groove is set to the light distribution performance that angle θ meets the demands, and for example is about 90 degree (for example, 80 to 100 degree).On the direction of hanging down by prism surface 2a as for display screen, lens coating 2 focuses on by the light of first diffusing globe 12 with the wide-angle diffusion.

Second diffusing globe 1 that is inserted between lens coating 2 and the liquid crystal indicator 21 is for example formed by the thick polycarbonate membrane of 0.25mm.And its lower surface (lens coating 2 sides) forms smooth surface 1b, and its upper surface (liquid crystal indicator 21 sides) then forms rough surface by known frosting technology.

As shown in Figure 1, be arranged between first diffusing globe 12 and the liquid crystal indicator 21 by the lens coating 2 that will have prism upper surface 2a and smooth lower surface 2b, focus on the direction of lens surface 2a perpendicular to display screen of scioptics film 2 brightness that can improve entire backlight 3 thus by first diffusing globe 12 with the light of wide-angle diffusion.In addition, can make on the whole that the scope of diffusion is little, can keep uniform Luminance Distribution thus.Therefore therefore, backlight 3 light can be used effectively, and can obtain light and show the LCDs that uniform luminance distributes.

And, roughened upper surface 1a by will having frosted and second diffusing globe 1 of smooth lower surface 1b are inserted between lens coating 2 and the liquid crystal indicator 21, the light of scioptics film 2 transmissions is by the roughened upper surface 1a diffusion of the frosted of second diffusing globe 1, therefore can prevent because the interference between lens coating 2 and the liquid crystal indicator 21 and the ripple that on display screen, occurs, and the corrugated dazzle that when watching display screen obliquely, occurs.

Note, reverberator 14, optical plate 13, first diffusing globe 12, lens coating 2, second diffusing globe 1 are kept being in direct contact with one another, and the gap is not set between any adjacent members of these members, in the recess in being arranged at frame body 15.

Perhaps, the lens coating 2 and first diffusing globe 12 can be integrally formed.For example, they can integrally formed feasible employing be mixed into the diffusion particle in the transparent resin material and diffusing layer are molded on the lower face side, then layers of prisms are molded on the upper surface side.

And the back light unit that the expansion of having introduced the electronics of liquid crystal display requires to be used for these liquid crystal displays is produced in enormous quantities.Particularly, when liquid crystal display being incorporated in littler, the thinner equipment, use the light source of light emitting diode usually as it.

With opposite by the optical plate that the acrylic panel member is processed as needed shape, current trend is in making them by injection moulding, and injection molding feature is to have reduced quantity and stable, the high-quality batch process of manufacturing technology steps.Injection moulding is such technology, will pack into the cavity of filling injection mould such as the melted material of the acryl resin of fusion, with the geometrical shape making moulded products identical with the geometric configuration of cavity.

Injecting molding die has the melted material load hole that is called cast gate (gate), the molten resin of the cavity filling that is used to pack into.The quality of the optical plate by the injection moulding manufacturing depends on the position of this cast gate, and this cast gate is the load hole of melted material.

Therefore, use them to prepare various types of optical plates at the injecting molding die of the cast gate of diverse location.For example, designed and put into practice such technology, wherein, as shown in Figure 2, be parallel on the side 32 that guides the direction of light on the light incident surface 31 that is incident on optical plate 21 by allowing cast gate 34 be positioned at, make optical plate 21, and as shown in Figure 3, by allowing cast gate 54 on light entrance face 51, prepare optical plate 41, in addition, as shown in Figure 4, by allowing cast gate 74 on the reflective plane of incidence 73 that is oppositely arranged with light entrance face 73, prepare optical plate 74.

[patent documentation 2] Japanese Patent Application Publication No.2002-292690

Will be with reference to figure 5, the ios dhcp sample configuration IOS DHCP of conventional liquid crystal display apparatus is described, wherein, the light source of a plurality of cold-cathode fluorescence lamps is close under the liquid crystal indicator in parallel with each other and arranges, as light source.

This LCD comprises a plurality of backlight 121 and LCD panel 122.

LCD panel 122 receives the light that is distributed and controlled by 121 diffusions backlight and light.

Backlight 121 comprise fluorescent tube 131-1 to 131-n, diffusing globe 132, after-frame 133, reflector plate 134, diffusion disk 135 and BEF 136.

From the light of fluorescent tube 131-1 to 131-n emission by diffusing globe 132 diffusions.And, from fluorescent tube 131-1 to 131-n emission and direction and diffusing globe 132 some opposite light reflect by being bonded to the reflector plate 134 of after-frame 133 on fluorescent tube 131-1 to 131-n one side surface, to enter into diffusing globe 132 diffusions.By the light of diffusing globe 132 diffusions further by diffusion disk 135 diffusions to enter brightness enhancement film (BEF) 136.BEF 136 have prism surface as its upper surface (LCD panel 122 sides) and smooth surface as its lower surface (diffusion disk 135 sides).Prism surface has many V-arrangement bar grooves that are arranged in parallel with each other to form the sawtooth shape of cross section.So the BEF 136 that forms will focus on upper surface (LCD panel 122 sides) by the light emission of diffusion disk 135 diffusions.

Light by diffusion disk 135 diffusions enters BEF 136 through air layer.With reference to figure 6, will describe to the light that enters BEF136 with from the light of BEF 136 outgoing.

Suppose that the scope that light by diffusion disk 135 diffusions is transmitted into the angle on the BEF 136 is from 0 to 90 degree, incide angle among the BEF 136 and equal the determined angle [alpha] of ratio by refraction coefficient with the refraction coefficient of air layer of BEF 136.If forming the resin of BEF 136 is that refraction coefficient is 1.49 acryl resin, light is transmitted into angle on the BEF 136 in ± 42 degree so.And the light that has entered BEF 136 shines upper surface (LCD panel 122 sides) from the prism surface of BEF 136.By the formed angle 3 of two faces of prism surface is by the refraction coefficient of the resin that forms BEF 136 and desired smooth focusing performance decision.

If do not require and distinguish fluorescent tube 131-1 to 131-n individually, always abbreviate them as fluorescent tube 131 so.

Summary of the invention

The technical problem to be solved in the present invention

Traditional backlight has used so many parts to satisfy the requirement of above-mentioned smooth guide performance and light distribution performance, makes their assembly cost rise.Therefore, require further to reduce cost by reducing number of components backlight.

For example, according to reference to figure 1 described technology, reverberator 14, optical plate 13, first diffusing globe 12, lens coating 2, second diffusing globe 1 remain in be provided with in the frame body 15 recessed, to such an extent as to and use the so many parts cost that raise thus.The technology of the patent documentation 1 open wherein integrally formed prism film 2 and first diffusing globe 12.But, unless one-body molded by the simple manufacturing method realization, otherwise can not cause cost to descend.In addition, the resinous type according to using as material may produce adhesion issues thus.

And, when as shown in Figure 2, when cast gate 34 is arranged on the side 32, and if melted material is encased in the cavity of injecting molding die through cast gate 34, will near cast gate 34, apply high pressure so.

The light reflection surface of optical plate promptly penetrates surperficial 35 facing surfaces with light in Fig. 2, provide prism pattern, dot pattern etc. usually, to be elevated to the incident light that light penetrates the surface effectively.These patterns are to form by the meticulous concavo-convex melted material of filling this cavity of transferring to that will be formed in the injecting molding die cavity.

It is high more with the pressure of filling to be applied to melted material, and transfer is made an appointment.Therefore, in optical plate shown in Figure 2 21, near the side 32 that is provided with cast gate 34, obtained excellent transfer performance.With opposite direction cast gate 3 is set, with 32 opposite flanks 33, side near near transfer performance poor than the side 32.

Therefore, in optical plate 21, uneven transfer having taken place, wherein the variation of transfer accuracy is taking place between left side and right side when light entrance face 31 is observed.Therefore, need the problem of solution to be to show uneven brightness from the light that light emergence face 35 penetrates.

And as shown in Figure 3, when cast gate 54 was arranged on the light entrance face 54, formed optical plate 41 did not have aforesaid inhomogeneous transfer, but the cast gate mark still flows on the light entrance face 51 time.Therefore, even excised cast gate 54, the light communication barriers has taken place also.In order to overcome this obstacle, need after having excised cast gate 54, polish light entrance face 51.

Therefore, compare with usually such manufacturing process, the manufacturing process of optical plate 41 has related to the step number increase, has therefore produced because manufacturing step quantity increases the loss of time that causes and the problem of cost increase.

In addition, as shown in Figure 4, when cast gate 74 is arranged on the reflective plane of incidence 73, if and optical plate 61 has wedge geometry, wedge shape is the typical shape of optical plate, such problem has then appearred: in the poorest situation, to such an extent as to the surface area of the cast gate 74 by its melted material of packing into become too narrow can not be by its molten resin of packing into.Particularly, in trending towards the electronic equipment that becomes littler and thinner, the thickness of optical plate itself also must be very little.Therefore therefore, in the situation of wedge shaped light guide plate 61, the reflective plane of incidence 73 becomes the thinnest, has caused being provided with on the reflective plane of incidence 73 the cast gate 74 unpractical problem that becomes.

In with reference to figure 5 described situations, number of components is big equally certainly, and in addition, the gap that forms air layer must accurately be arranged between the parts, and this has improved manufacturing cost.

And, along with messaging device becomes littler, need thinner liquid crystal display.Therefore, be desirable to provide thinner light guide member.

In view of said circumstances, carried out the present invention, and target of the present invention is to allow to provide high-performance, backlight cheaply, this is backlight thinner than traditional backlight.

And the present invention also is intended to by optical plate that non-essential manufacturing step is realized providing does not have non-homogeneous transfer being provided, providing the manufacture method of backlight, the optical plate of such optical plate.

The method of dealing with problems

Of the present invention first backlight be characterised in that comprise radiative light source and be arranged on light source and liquid crystal indicator between diffusing globe.Diffusing globe is integrally formed by diffusing layer and light distribution layer, and diffusing layer is used for the light of diffusion from light emitted, and the light distribution layer be provided with than diffusing layer more towards liquid crystal indicator, be used for the light of diffusing layer diffusion is distributed to liquid crystal indicator.That is, diffusing globe of the present invention forms by the diffusing layer and the light distribution layer of integrated molding.And, as light source, for example can use cold-cathode fluorescence lamp, LED etc.

Of the present invention first backlight in, light emission enters diffusing globe.In this diffusing globe, emission is distributed by the light distribution layer by the diffusing layer diffusion from the light of light source.The light distribution layer with diffusing layer integrally formed and be provided with than diffusing layer more towards liquid crystal indicator.

The manufacture method of first diffusing globe of the present invention is characterised in that and comprises: first step of packing into, with first resin, first right cylinder of packing into; Second step of packing into is with first resin that has wherein mixed second resin that is different from first resin, second right cylinder of packing into; First forming step, use wherein by first packed into first right cylinder of first resin and of step of packing into wherein by second packed into second right cylinder of first resin that mixed second resin of step of packing into, by the multilayer extrusion molding, come moulding to comprise first resin and the double-layer tablet of having mixed first resin of second resin; And second forming step, by surperficial roll-in, first resin surface of the sheet of the first forming step moulding is shaped to prismatic shape.

In the manufacture method of first diffusing globe of the present invention, with first resin, first right cylinder of packing into, with first resin that has wherein mixed second resin of first resin, second right cylinder of packing into.Using then wherein by first packed into first right cylinder of first resin and wherein by second packed into second right cylinder of first resin that mixed second resin of step of packing into of step of packing into, is double-layer tablet with first resin with first resin forming that has mixed second resin.By surperficial roll-in, first resin surface of the sheet of moulding is shaped to prismatic shape.

The manufacture method of second diffusing globe of the present invention is characterised in that and comprises: first step of packing into, with first resin, first right cylinder of packing into; Second step of packing into is with first resin that has wherein mixed second resin that is different from first resin, second right cylinder of packing into; The 3rd step of packing into is with first resin three cylindrical body of packing into; First forming step, use first right cylinder of first resin of wherein having packed into, packed into second right cylinder of first resin that mixed second resin and wherein wherein by the 3rd packed into the three cylindrical body of first resin of step of packing into, by the multilayer extrusion molding, come the moulding three-layer tablet, wherein three-layer tablet is formed by first resin, first resin that has mixed second resin and first resin, and two surface that appears is formed by first resin; Second forming step, by surperficial roll-in, the surface forming of the layer that one first resin of the sheet of the first forming step moulding is formed is a prismatic shape; And the 3rd forming step, by surperficial roll-in, the surface forming of the layer that another first resin of the sheet of the first forming step moulding is formed is a prismatic shape.

In the manufacture method of second diffusing globe of the present invention, with first resin, first right cylinder of packing into, with first resin that has wherein mixed second resin of first resin, second right cylinder of packing into, the three cylindrical body of also first resin being packed into.Then, use first right cylinder of first resin of wherein having packed into, wherein packed into second right cylinder of first resin that mixed second resin and the three cylindrical body of first resin of wherein having packed into, come the moulding three-layer tablet by the multilayer extrusion molding.Three-layer tablet is formed by first resin, first resin that has mixed second resin and first resin, and two surface that appears is formed by first resin.By surperficial roll-in, the surface forming of the layer that one first resin of the sheet of moulding is formed is a prismatic shape; And the 3rd forming step, and by surperficial roll-in, the surface forming of the layer that another first resin of the sheet of moulding is formed is a prismatic shape.

The manufacture method of the 3rd diffusing globe of the present invention is characterised in that and comprises: blend step, with second mixed with resin in first resin; First forming step is a sheet with first resin that has wherein mixed second resin by blend step; And second forming step, use the 2P forming method that prismatic shape first resin forming must be contacted with the surface of sheet by the first forming step moulding and therefore become one.

In the manufacture method of the 3rd diffusing globe of the present invention, in first resin, and first resin that will wherein mix second resin is a sheet with second mixed with resin.Then, use the 2P forming method that prismatic shape first resin forming must be contacted with the surface of sheet by the first forming step moulding and therefore become one.

First liquid crystal display of the present invention is characterised in that and comprises: liquid crystal indicator; And be used to illuminate the backlight of liquid crystal indicator, wherein, backlight comprise radiative light source and be arranged on light source and liquid crystal indicator between diffusing globe, wherein diffusing globe comprises diffusing layer and light distribution layer, diffusing layer is used for the light of diffusion from light emitted, and the light distribution layer be provided with than diffusing layer more towards liquid crystal indicator, be used for the light of diffusing layer diffusion is distributed to liquid crystal indicator.

In first liquid crystal display of the present invention, liquid crystal indicator is provided and has been used to illuminate the backlight of liquid crystal indicator.In this was backlight, light was launched and is entered diffusing globe.In this diffusing globe, emission is distributed by the light distribution layer by the diffusing layer diffusion from the light of light source.The light distribution layer with diffusing layer integrally formed and be provided with than diffusing layer more towards liquid crystal indicator.

Of the present invention second backlight being characterised in that comprises: radiative light source; And be arranged on diffusing globe between light source and the liquid crystal indicator, wherein, diffusing globe comprises light focus layer and light distribution layer, the light focus layer is used to focus on the light of emission from light source, and the light distribution layer with the light focus layer integrally formed and be provided with than light focus layer more towards liquid crystal indicator, be used for the light that the light focus layer focuses on is distributed to liquid crystal indicator.

Of the present invention second backlight in, liquid crystal indicator is provided and has been used to illuminate the backlight of liquid crystal indicator.In this was backlight, light was launched and is entered diffusing globe.In this diffusing globe, emission is focused on by the light focus layer and is distributed by the light distribution layer from the light of light source.The light distribution layer with the light focus layer integrally formed and be provided with than light focus layer more towards liquid crystal indicator.

Second liquid crystal display of the present invention is characterised in that and comprises: liquid crystal indicator; And be used to illuminate the backlight of liquid crystal indicator, wherein, backlight comprise radiative light source and be arranged on light source and liquid crystal indicator between diffusing globe, and wherein, diffusing globe comprises light focus layer and light distribution layer, the light focus layer is used to focus on the light of emission from light source, and the light distribution layer with the light focus layer integrally formed and be provided with than light focus layer more towards liquid crystal indicator, be used for the light that the light focus layer focuses on is distributed to liquid crystal indicator.

In second liquid crystal display of the present invention, liquid crystal indicator is provided and has been used to illuminate the backlight of liquid crystal indicator.In this was backlight, light was launched and is entered diffusing globe.In this diffusing globe, in this diffusing globe, emission is focused on by the light focus layer and is distributed by the light distribution layer from the light of light source.The light distribution layer with the light focus layer integrally formed and be provided with than light focus layer more towards liquid crystal indicator.

According to first optical plate of the present invention, it has light entrance face, be used to guide light from a plurality of light-emitting device emissions, a plurality of light-emitting devices become delegation with arranged at predetermined intervals on the longitudinal direction of light entrance face, be used for surface emitting, it is characterized in that: cast gate is arranged on the position of the light entrance face of not arranging a plurality of light-emitting devices, by cast gate melted material is packed to come into the cavity of filling injection mould in the process of injection moulding optical plate.

According to second optical plate of the present invention, it has light entrance face, be used to guide light from a plurality of light-emitting device emissions, a plurality of light-emitting devices become delegation with arranged at predetermined intervals on the longitudinal direction of light entrance face, be used for surface emitting, and be thereby that its thickness of wedge shape reduces on the direction of light that guiding is directed gradually, it is characterized in that: cast gate is arranged on the position of the light entrance face of not arranging a plurality of light-emitting devices, by cast gate melted material is packed to come into the cavity of filling injection mould in the process of injection moulding optical plate.

The 3rd optical plate according to the present invention is characterised in that and comprises: optical plate is used to guide the light that is incident on the light entrance face to be used for from the light emergence face surface emitting; Light source has on the longitudinal direction of light entrance face and becomes delegation to be used for a plurality of light-emitting devices of surface emitting with arranged at predetermined intervals; Reflector plate is arranged on the side of light reflection surface of optical plate; Sheet element is formed by diffusion disk and prismatic lens, is provided with on the side of the light emergence face that is stacked on optical plate; Framework, be used for light source, reflector plate and sheet element are remained on optical plate, wherein, optical plate has cast gate, be arranged on the position of the light entrance face of not arranging a plurality of light-emitting devices, in the process of injection moulding optical plate, melted material packed to come into the cavity of filling injection mould by cast gate.

The 4th optical plate according to the present invention is characterised in that and comprises: optical plate is used to guide the light that is incident on the light entrance face from light emergence face to be used for surface launching, and is the wedge shape that its thickness reduces on the direction of light that guiding is directed gradually; Light source has on the longitudinal direction of light entrance face and becomes delegation to be used for a plurality of light-emitting devices of surface emitting with arranged at predetermined intervals; Reflector plate is arranged on the side of light reflection surface of optical plate; Sheet element is formed by diffusion disk and prismatic lens, is provided with on the side of the light emergence face that is stacked on optical plate; Framework, be used for light source, reflector plate and sheet element are remained on optical plate, wherein, optical plate has cast gate, be arranged on the position of the light entrance face of not arranging a plurality of light-emitting devices, in the process of injection moulding optical plate, melted material packed to come into the cavity of filling injection mould by cast gate.

Method according to preparation first optical plate of the present invention, wherein first optical plate has light entrance face, and guiding is from the light of a plurality of light-emitting device emissions, a plurality of light-emitting devices become delegation with arranged at predetermined intervals on the longitudinal direction of light entrance face, be used for surface emitting, it is characterized in that: pack into to come the cavity of filling injection mould to come the injection moulding optical plate melted material by cast gate, cast gate is arranged on the position of the light entrance face of not arranging a plurality of light-emitting devices.

Method according to preparation second optical plate of the present invention, wherein second optical plate has light entrance face, and guiding is from the light of a plurality of light-emitting device emissions, a plurality of light-emitting devices become delegation with arranged at predetermined intervals on the longitudinal direction of light entrance face, be used for surface emitting, and be the wedge shape that its thickness reduces on the direction of light that guiding is directed gradually, it is characterized in that: pack into to come the cavity of filling injection mould to come the injection moulding optical plate melted material by cast gate, cast gate is arranged on the position of the light entrance face of not arranging a plurality of light-emitting devices.

Advantage of the present invention

According to a first aspect of the invention, in liquid crystal display, liquid crystal display can be illuminated, and especially, it has the number of components that reduces and satisfies desired smooth distribution performance.

According to a second aspect of the invention, can make a kind of diffusing globe.Especially, can use multilayer extrusion molding and roll-in, make wherein diffusing layer and the integrally formed diffusing globe of light distribution layer by simple method.

According to a third aspect of the invention we, can make a kind of diffusing globe.Especially, can use multilayer extrusion molding and roll-in, make wherein light focus layer, diffusing layer and the integrally formed diffusing globe of light distribution layer by simple method.

According to a forth aspect of the invention, can make a kind of diffusing globe.Especially, can use the 2P forming method, make wherein diffusing layer and the integrally formed diffusing globe of light distribution layer by simple method.

According to a fifth aspect of the invention, can provide a kind of liquid crystal display.Especially, can provide a kind of liquid crystal display, it has can illuminate the backlight of liquid crystal indicator, has the number of components that reduces and satisfies desired smooth distribution performance.

According to a sixth aspect of the invention, in liquid crystal display, liquid crystal display can be illuminated, and especially, it has the number of components that reduces and carries out in the mode of the utilization ratio that increases the light of being launched.

According to a seventh aspect of the invention, can provide a kind of liquid crystal display.Especially, can provide a kind of liquid crystal display, it has can illuminate the backlight of liquid crystal indicator, and it has the number of components that reduces and carries out in the mode of the utilization ratio that increases the light of being launched.

And, method according to the optical plate that constitutes eighth aspect present invention and this optical plate of manufacturing, cast gate is arranged on the position of the light entrance face of not arranging a plurality of light-emitting devices, by cast gate melted material is packed to come into the cavity of filling injection mould in the process of injection moulding optical plate.Therefore, can suppress with respect to the left side of light incident direction and the inhomogeneous transfer between the right side.And, owing to no longer need to excise,, low cost is created may and promote batch process so can reduce manufacturing time by watering watering the interruption-forming thing and polishing removal surface of interruption-forming.

And, constitute backlight such as optical plate of ninth aspect present invention, allow its manufacturing time to obtain reducing, low cost is created may and promote batch process.

Description of drawings

Figure 1A is the synoptic diagram that the structure backlight of conventional light guides is used in explanation.

Figure 1B is the synoptic diagram that the structure backlight of conventional light guides is used in explanation.

Fig. 1 C is the synoptic diagram that the structure backlight of conventional light guides is used in explanation.

Fig. 2 is the synoptic diagram of optical plate that passes through to provide cast gate preparation on its side that explanation is depicted as conventional art.

Fig. 3 is the synoptic diagram of optical plate that passes through to provide cast gate preparation on its light entrance face that explanation is depicted as conventional art.

Fig. 4 is the synoptic diagram of optical plate that passes through to provide cast gate preparation on its reflective plane of incidence that explanation is depicted as conventional art.

Fig. 5 is the synoptic diagram that the structure of the traditional backlight of using fluorescent tube is described.

Fig. 6 is explanation enters the light of BEF through air layer a synoptic diagram.

Fig. 7 is the synoptic diagram that first structure of example backlight of the present invention has been used in explanation.

Fig. 8 is the synoptic diagram that the light distribution performance of diffusing globe of the present invention has been used in explanation.

Fig. 9 is the process flow diagram of explanation diffusing globe manufacture process 1.

Figure 10 is the synoptic diagram of explanation diffusing globe manufacture process 1.

Figure 11 is the synoptic diagram of explanation diffusing globe manufacture process 1.

Figure 12 is the process flow diagram of explanation diffusing globe manufacture process 2.

Figure 13 is the synoptic diagram of explanation diffusing globe manufacture process 2.

Figure 14 is the synoptic diagram of explanation diffusing globe manufacture process 2.

Figure 15 is the synoptic diagram that second structure of example backlight of the present invention has been used in explanation.

Figure 16 is the process flow diagram of explanation diffusing globe manufacture process 3.

Figure 17 is the synoptic diagram of explanation diffusing globe manufacture process 3.

Figure 18 is the synoptic diagram of explanation diffusing globe manufacture process 3.

Figure 19 is the process flow diagram of explanation diffusing globe manufacture process 4.

Figure 20 is the synoptic diagram of example that the light distributor of the light distributor that is used for substituting Figure 15 is shown.

Figure 21 is the synoptic diagram that the 3rd structure of example backlight of the present invention has been used in explanation.

Figure 22 is the synoptic diagram that explanation is depicted as the optical plate of implementing optimal mode of the present invention.

Figure 23 is the synoptic diagram that another example of same light guide plate is shown.

Figure 24 is the synoptic diagram that the outward appearance of the same light guide plate that comprises running channel is shown.

Figure 25 is the synoptic diagram that the structure of the back light unit of having introduced the same light guide plate is described.

Figure 26 is the synoptic diagram of the specially-made same light guide plate of explanation.

Figure 27 shows the synoptic diagram for the brightness measurement result of specially-made same light guide plate.

Figure 28 is that explanation is by providing cast gate and the synoptic diagram of specially-made optical plate on its side.

Figure 29 shows the synoptic diagram of the brightness measurement result of specially-made optical plate for provide cast gate on its side.

The reference number explanation

122 LCD panels, 131 fluorescent lights, 133 afterframes, 134 reflector plates, 161 is backlight, 171 diffusing globes, 181 smooth distribution layers, 182 diffusing layers, 191 diffuse components, 201 first resins, 202 second resins, 205 first right cylinders, 206 second right cylinders, 207 surface roll, 221 moulds, 251 is backlight, 261 diffusing globes, 271 smooth incident key-courses, 281 three cylindrical bodies, 301 diffusing globes, 311 smooth incident key-courses, 321 smooth incident control sections, 351 is backlight, 361 diffusing globes, 401 optical plates, 411 light entrance faces, 411a, 411b, 411c, the 411d position, 415 water the interruption-forming thing, 420 the Lights sections, 421,421a, 421b, 421c, the 421d light emitting diode, 422a, 422b, 422c, the 422d light emergence face, 423 substrates, 471 back light units

Embodiment

[embodiment 1]

To describe first embodiment of the present invention with reference to the accompanying drawings.

Type backlight for wherein such as cold-cathode fluorescence lamp (CCFL) or light emitting diode (LED) along and near the type of the side arrangement of the optical plate that is used for direct light that forms by lucite, and the type that wherein is arranged parallel to each other such as the light source of a plurality of cold-cathode fluorescence lamps.In the former, between optical plate and liquid crystal indicator, insert diffusing globe, and in the latter, between a plurality of cold-cathode fluorescence lamps and liquid crystal indicator, insert diffusing globe, diffusing globe is used for light diffusion is shone LCD equably.

In embodiment 1, will such situation be described, wherein be close under the liquid crystal indicator in parallel with each other and arrange such as the light source of a plurality of cold-cathode fluorescence lamps.

Fig. 7 is used to illustrate the viewgraph of cross-section with first ios dhcp sample configuration IOS DHCP of having used liquid crystal display backlight of the present invention.

Note, given identical reference number, therefore omitted explanation them corresponding to the part in the conventional example.

That is, used of the present invention backlight 161 have with reference to shown in Figure 5 backlight 121 similar structures, comprise diffusing globe 171 but not diffusing globe 132, diffusion disk 135 and the BEF 136 except backlight 161.

Diffusing globe 171 provides the diffusing layer 182 that comprises diffuse component 191, and the light of emission autofluorescence pipe 131 enters on the side.The lower surface of diffusing layer 182 (fluorescent tube 131 sides) is a smooth-shaped.At the opposite side of the diffusing layer 182 of LCD panel 122 1 sides, i.e. a side of the light outgoing of many emissions provides the light distribution layer 181 that is formed by prism surface.This prism surface comprises many V-arrangement bar grooves with sawtooth shape of cross section or the concavo-convex array that each has half-cylindrical cross-sectional structure (for example bar groove of one-tenth formation parallel to each other in array or concavo-convex).Particularly, the prism surface of light distribution layer 181 can be the array of triangle, sinusoidal curve, semicircle, oval cross section.And the prism surface of light distribution layer 181 can be wherein a plurality of triangles, sinusoidal curve, semicircle, ellipse, pyramid, semisphere unit arranging along X that is perpendicular to one another and the setting of Y direction.

The part light that has entered diffusing layer 182 enters the surface of diffuse component 191, and owing to the resin that forms the part diffusing layer 182 do not comprise diffuse component 191 and the difference that forms between the refraction coefficient of resin of diffuse component 191 cause partly reflecting.Part light enters diffuse component 191 with predetermined refraction coefficient, and to be scheduled to refraction coefficient from diffuse component 191 outgoing.That is, entered the light of diffusing layer 182 by diffuse component 191 diffusions.

The light of diffusion makes light distribute to LCD panel 122 by 181 controls of light distribution layer in diffusing layer 182.

In diffusing globe 171, light distribution layer 181 and the part diffusing layer 182 except that diffuse component 191 are formed by same resin.Only diffuse component 191 is formed by different resins.Therefore, reflection of light and refraction can not take place between light distribution layer 181 and diffusing layer 182.And, the refraction coefficient that preferably forms the resin of light distribution layer 181 and the part diffusing layer 182 except that diffuse component 191 is got bigger value with the ratio of the refraction coefficient of the resin that forms diffuse component 191, because the light diffusion effect of diffuse component 191 is enhanced thus.

Preferably, the scope of using refraction coefficient at from 1.2 to 1.7 resin as first resin that forms light distribution layer 181 and the part diffusing layer 182 except that diffuse component 191, and second resin that is used to form diffuse component 191.

Particularly, as first resin that is used to form light distribution layer 181 and the part diffusing layer 182 except that diffuse component 191 and second resin that is used to form diffuse component 191, can use different resins respectively, its scope that for example comprises refraction coefficient in the scope of from 1.58 to 1.59 polycarbonate (PC), refraction coefficient in the scope of from 1.49 to 1.50 polymethylmethacrylate (PMMA) or refraction coefficient at from 1.56 to 1.58 methacrylic styrene (MS).

In with reference to figure 5 and the described conventional example of Fig. 6, because the difference of refraction coefficient between air layer and the BEF 136, before control light distributed, the incident angle of light was limited.Comparatively speaking, with different with the described conventional example of Fig. 6, in having used diffusing globe 171 of the present invention, between light diffusion part and light focusing block, do not insert air layer with reference to figure 5.That is, using in of the present invention backlight 161, the light of diffusion does not distribute by air layer.Therefore, as shown in Figure 8, the light of arrival light distribution layer 181 has kept the scattering angle by diffuse component 191 diffusions.

Therefore, light distribution layer 181 needed smooth distribution performances are not different with the traditional B EF 136 of the light that receives diffusion by air layer.The prism surface of light distribution layer 181 optimized diffusing layer 182 diffusion efficiency, form the refraction coefficient and the backlight 161 required light distribution performances of the resin of light distribution layer 181.

By having so configuration, can provide so backlight, it need not to use the diffusion disk that is different from diffusing layer 182 etc. just can realize required light distribution performance.

Although illustrated here and used the situation of fluorescent tube 131 as light source, this is not that expression can not be used light emitting diode (LED) etc. in addition.

Next with reference to the process flow diagram of figure 9,10 and 11, will describe diffusing globe manufacturing process 1, technology 1 is to make the example of the technology of diffusing globe 171.

At step S1, prepared first resin that is used to form light distribution layer 181 and the part diffusing layer 182 except that diffuse component 191, and the point that has prepared second resin that is used to form diffuse component 191.

At step S2, the point of second resin is mixed in first resin to form diffusing layer 182.Point from be mixed into first resin has formed the diffuse component 191 of diffusing layer 182.

At step S3, with first resin, first right cylinder of packing into, will with first resin of second mixed with resin, second right cylinder of packing into, to carry out the multilayer extrusion molding.That is, as shown in figure 10, first resin 201 is packed in first right cylinder 205, first resin 201 that will mix with second resin 202 is packed in second right cylinder 206.

At step S4, the multilayer extrusion molding is undertaken by multilayer extrusion molding machine.

The multilayer extrusion molding is a kind of method for preparing long and narrow goods on principle, it is fed to resin material in the heated cylinder (tube) by using screw or piston, be used for heating and fluidization, make material by preceding terminal mould (geometric configuration of the cavity of mould is identical with the xsect of the material that passes through from it) with material forming, make the cooling of water or air then and solidify.Can use the mould manufacturing of different geometries to have the goods of the moulding of various xsects, such as film, sheet, pipe, wheel profile (profile).

Here suppose that this mould is used for the geometric configuration of moulding sheet.As shown in figure 10, in first right cylinder 205 that first resin 201 is packed into, first resin 201 that will mix with second resin 202 is packed in second right cylinder 206, moulding double-layer tablet, it has diffusing layer 182 and is used to prepare the layer of light distribution layer 181 (formed and also do not formed prism surface by first resin 201).

At step S5, as shown in figure 11, in the sheet by multilayer extrusion molding machine preparation, a side (surface roll 207 1 sides Figure 11) of first resin of extruding from first right cylinder is prism shape by surface roll is molded, has formed the light distribution layer 181 continuous with diffusing layer 182 thus.So far, the preparation that is through with does not have the technology of the diffusing globe 171 of air layer between light distribution layer 181 and diffusing layer 182.

Next with reference to Figure 12,13 and 14 process flow diagram, will describe diffusing globe preparation technology 2, it is different from the technology with reference to figure 9,10 and 11 described preparation diffusing globes 171.

At step S21, prepared first resin that is used to form light distribution layer 181 and the part diffusing layer 182 except that diffuse component 191, and the point that has prepared second resin that is used to form diffuse component 191.

At step S22, the UV hardening agent is mixed into part first resin 201 that forms light distribution layer 181.Note,, can omit this step so if first resin is the UV hardening agent.

At step S23, the point of second resin 202 is mixed in first resin 201 to form diffusing layer 182.Point from second resin 202 that is mixed into first resin 201 has formed the diffuse component 191 of diffusing layer 182.

At step S24, first resin 201 that second resin 202 is mixed for example is shaped to sheet by extruding forming method, calendering forming method etc.Form diffusing layer 182 from the resin sheet of moulding thus.

At step S25, wherein mixed the UV hardening agent or be applied to first resin 201 that sheet second resin 202 mixes for first resin 201 of UV cured resin.

At step S26, wherein use the 2P forming method will mix the UV hardening agent or be shaped to the prismatic shape that mould 221 is limited as first resin 201 of UV cured resin, formed light distribution layer 181 thus.So far the preparation that is through with does not have the diffusing globe 171 of air between light distribution layer 181 and diffusing layer 181.

The 2P forming method is a kind of system, wherein by using low viscosity UV cured resin, the geometric configuration of mould is transferred on the resin to duplicate.Particularly, between electric forming mould (pressing mold) and base plate glass, apply the UV cured resin, and this resin is to carry out UV by irradiation ultraviolet radiation to solidify, thereby is shaped to desirable shape.

Be included in diffusing globe 171 in Fig. 7 backlight by making with reference to figure 9 to 14 described any manufacturing process.

Figure 15 is used to illustrate the viewgraph of cross-section with second ios dhcp sample configuration IOS DHCP of having used liquid crystal display backlight of the present invention.

Note,, therefore omitted explanation them corresponding to having given identical reference number with reference to the part in the situation of figure 7 described first ios dhcp sample configuration IOS DHCPs.

That is, used second structure of the present invention backlight 251 in example have with reference to shown in Figure 7 backlight 161 similar structures, comprise diffusing globe 261 but not the diffusing globe 171 except backlight 251.

Except with diffusing globe 171 those similar light distribution layers 181 and diffusing layer 182, diffusing globe 261 provides the light incident key-course 271 on the prismatic shape surface that is included on fluorescent tube 131 1 sides.This prismatic shape surface has the V-arrangement bar groove that is the sawtooth shape of cross section of a lot of layouts parallel to each other or each is the concavo-convex of semicolumn cross-sectional structure.Light incident key-course 271 is formed by the resin identical with light distribution layer 181 and the part diffusing layer except that diffuse component 191 182 (Figure 10,11 or 13 first resin 201), only has diffuse component to be formed by different resins.Therefore, reflection and refraction do not take place between light incident key-course 271 and diffusing layer 182.And the prismatic shape of light incident key-course 271 can be identical or different with the shape of light distribution layer 181.

The prismatic shape of light incident key-course 271 so disposes the light or the emission autofluorescence pipe 131 that allow to launch autofluorescence pipe 131 and is guided to diffusing layer 182 effectively by the light of reflector plate 134 emissions then.The ratio that enters the light of incident key-course 271 and arrive the light of incident key-course 271 determines by the refraction coefficient of the air ratio with the refraction coefficient of the resin that forms light incident key-course 271, supposes that light enters with incident angle at random.By on light incident key-course 271, forming prism, for the part surface that reaches light incident key-course 271 but do not enter the light of light incident key-course 271 by light incident key-course 271 reflection, can increase the ratio of the light that enters light incident key-course 271 other parts surfaces once more.

Therefore, because light incident key-course 271, compare with the diffusing globe 171 in first ios dhcp sample configuration IOS DHCP, the light that the diffusing globe 261 in second ios dhcp sample configuration IOS DHCP can reduce no show diffusing layer 182 is the ratio of the light of loss light that fluorescent tube 131 is launched.Therefore, can use single diffusing globe to realize light diffusion, distribute and control and the light focus control.

By having so configuration, backlight 251 can realize required light distribution performance, and can suppress the loss of the light that fluorescent tube 131 produces, and need not to use the diffusion disk that is different from diffusing layer 182 etc.

Next with reference to Figure 16,17 and 18, will describe diffusing globe manufacturing process 3, it is an example of making the technology of diffusing globe 261.

At step S41, prepared first resin 201 that is used to form light distribution layer 181, light incident key-course 271 and the part diffusing layer 182 except that diffuse component 191, and the point that has prepared second resin 202 that is used to form diffuse component 191.

At step S42, the point of second resin 202 is mixed in first resin 201 to form diffusing layer 182.The point of second resin 202 from be mixed into first resin 201 has formed the diffuse component 191 of diffusing layer 182.

At step S43, with first resin 201 pack into first right cylinder and three cylindrical body, first resin 201 that will mix with second resin 202, second right cylinder of packing into is to carry out the multilayer extrusion molding.That is, in the technology of making diffusing globe 261, three right cylinders have been used.As shown in figure 17, first resin 201 is packed in first right cylinder, first resin 201 that will mix with second resin 202 is packed in second right cylinder, and first resin 201 is packed in the three cylindrical body.First right cylinder and three cylindrical body are in the second right cylinder both sides toward each other.

At step S44, the multilayer extrusion molding is undertaken by multilayer extrusion molding machine.Here, because first resin 201 is packed in first right cylinder, first resin 201 that will mix with second resin 202 is packed in second right cylinder, and first resin 201 packed in the three cylindrical body, so moulding three-layer tablet, it comprises layer (not first resin 201 of moulding prism), diffusing layer 182 that is used to prepare light distribution layer 181 and the layer (not first resin 201 of moulding prism) that is used to prepare light incident key-course 271.

At step S45, with similar with reference to situation shown in Figure 11, in sheet by the preparation of multilayer extrusion molding machine, surface roll 207 surface roll are molded to be prism shape to one side of first resin of extruding from first right cylinder by using, and has formed the light distribution layer 181 continuous with diffusing layer 182 thus.

At step S46, as shown in figure 18, in sheet by the preparation of multilayer extrusion molding machine, one side of first resin of extruding from the three cylindrical body 201 (in other words, the surface that is different from the light distribution layer 181 of moulding in step S45) surface roll 207 surface roll are molded to be prism shape by using, and has formed the light incident key-course 271 continuous with diffusing layer 182 thus.So far, the preparation that is through with does not have the technology of the diffusing globe 261 of air layer between any adjacent light distribution layer 181, diffusing layer 182 and light incident key-course 271.

Next with reference to the process flow diagram of Figure 19, will describe diffusing globe preparation technology 4, it is the example that is different from reference to the technology of the described diffusing globe preparation technology's 3 of Figure 16 preparation diffusing globe 261.

At step S61, prepared first resin 201 that is used to form light distribution layer 181, light incident key-course 271 and the part diffusing layer 182 except that diffuse component 191, and the point that has prepared second resin 202 that is used to form diffuse component 191.

At step S62, the UV hardening agent is mixed in part first resin 201 that forms light distribution layer 181 and light incident key-course 271.Note,, can omit this step so if first resin is the UV hardening agent.

At step S63, the point of second resin 202 is mixed in first resin 201 to form diffusing layer 182.Point from second resin 202 that is mixed into first resin 201 has formed the diffuse component 191 of diffusing layer 182.

At step S64, first resin 201 of second mixed with resin is for example formed sheet by extruding forming method, calendering forming method etc.From the resin sheet of moulding thus, form diffusing layer 182.

At step S65, wherein mixed the UV hardening agent or be applied to for first resin 201 of UV cured resin on the surface of first resin 201 that sheet second resin 202 mixes.

At step S66, use the 2P forming method will wherein mix the UV hardening agent or be shaped to prismatic shape as first resin 201 of UV cured resin, formed light distribution layer 181 thus.

At step S67, wherein mixed the UV hardening agent or be applied to for first resin 201 of UV cured resin on the surface of first resin 201 that sheet second resin 202 mixes (diffusing layer 182), its difference has been passed through step 66 moulding the surface of prism (that is, the light distribution layer 181) thereon.

At step S68, will wherein mix the UV hardening agent or, form light incident key-course 271 thus for first resin 201 of UV cured resin is shaped to prismatic shape by the 2P forming method.So far, the preparation that is through with does not have the technology of the diffusing globe 261 of air layer between any adjacent light distribution layer 181, diffusing layer 182 and light incident key-course 271.

By reference Figure 16 or 19 the explanation manufacturing process, made be included in Figure 15 backlight 251 in diffusing globe 261.

Perhaps, can use such as diffusing globe shown in Figure 20 301, but not the diffusing globe 261 of Figure 15.

Diffusing globe 301 comprises light distribution layer 181 and diffusing layer 182, and is similar in the diffusing globe 261 those, but also comprises having different Prism-Shaped smooth incident key-courses 311, with instead of optical incident key-course 271.

The prism of light incident key-course 311 on fluorescent tube 131 sides comprises light incident control section 321 (two light incident control sections 321, that is, light incident control section 321-1 as shown in figure 20 and light incident control section 321-2).Its shape is by it self and near the distance decision between it self any one fluorescent tube 131-1 to 131-n.

If the light entrance face of the light incident of autofluorescence pipe 131 emissions such as the diffusing globe 171 of Fig. 7 are flat, has the consistent pattern of the light incident key-course that provided with the diffusing globe 261 of Figure 15 271 if perhaps be used for focusing on prism from the light of fluorescent tube 131, so according to its whether any fluorescent tube 131-1 to 131-n directly above or position between adjacent fluorescent tube 131-1 to 131-n, the flat surfaces that the incident angle that is emitted to the light of diffusing globe 171 or 261 from fluorescent tube 131 is distributed in LCD panel 122 changes.Therefore, the unevenness of light can take place.

In traditional backlight, the brightness on the flat surfaces of LCD panel descends by the brightness that makes bright part and is designed to be even.Comparatively speaking, in diffusing globe 301, design makes more light to enter diffusing globe 301 in the position that brightness descends, i.e. position between adjacent arbitrarily fluorescent tube 131-1 to 131-n.

That is, in diffusing globe 301, by form prism on the surface of the light incident key-course 311 on the side of fluorescent tube 131, the brightness that is transmitted into the light on LCD panel 122 can be enhanced.In addition, by optimize the shape of prism based on the layout of fluorescent tube 131-1 to 131-n, the unevenness of height backlight improves.

Figure 21 is used to illustrate the viewgraph of cross-section with the 3rd ios dhcp sample configuration IOS DHCP of having used liquid crystal display backlight of the present invention.

Note,, therefore omitted explanation them corresponding to having given identical reference symbol with reference to the part in the situation of figure 7 described first ios dhcp sample configuration IOS DHCPs.

That is, used the 3rd structure of the present invention backlight 351 in example have with reference to shown in Figure 7 backlight 161 similar structures, comprise diffusing globe 361 but not the diffusing globe 171 except backlight 351.

Except having omitted diffusing layer 182, diffusing globe 361 have with reference to the similar configuration of the described diffusing globe of Figure 20 301.That is, diffusing globe 361 comprises light distribution layer 181 and light incident control section 311.And, reflection and refraction do not take place between light incident control section 311 and light distribution layer 181.

By omitting diffusing layer 182 from diffusing globe 361, to compare with diffusing globe 171, diffusing globe 261 or diffusing globe 301, the light transmission of diffusing globe 361 has increased.In configuration so, by of the combination decision of backlight 351 heterogeneities that are transmitted into the light on the LCD panel 122 by the light focusing performance of the light distribution performance of light distribution layer 181 and light incident control section 311.Therefore, by optimizing each the shape of prism of light incident control section 311 and light distribution layer 181, can obtain desirable performance.

By having so configuration, need not to use the diffusion disk that is different from diffusing layer 182 etc. just can realize required light distribution performance.And light transmission increases, and therefore can provide the backlight of high brightness, and this can effectively utilize from the light of fluorescent tube 131 emissions.

As mentioned above, used of the present invention backlight in, the high-performance diffusing globe with diffusion function and light distributed function can whole form, and has therefore reduced the quantity that forms parts backlight, makes it possible to reduce component costs.And, in traditional backlight, its component-assembled made between any adjacent diffusing globe, distribution sheet and lens, formed air layer, therefore need high assembling accuracy, thereby improved assembly cost backlight.But, used of the present invention backlight in, can use simple method to come the whole high-performance diffusing globe made from diffusion function and light distributed function, therefore can realize that assembly cost reduces.

Attention used of the present invention aforementioned backlight in, illustrated that reflector plate 134 is arranged on the example of the back of the body on the framework 133.But much less, the present invention can be applied to reflector plate 134 and be arranged on situation other position except that Fig. 7 example etc., and can be applied to not have the situation of cremasteric reflex sheet 134.

[embodiment 2]

Describe in detail to implement according to the best illustration of optical plate of the present invention below with reference to the accompanying drawings and make this optical plate and method backlight.

Similar with the situation of the foregoing description 1, type backlight for wherein such as cold-cathode fluorescence lamp (CCFL) or light emitting diode (LED) along and near the type of the side arrangement of the optical plate that is formed for direct light by lucite, and wherein be arranged parallel to each other type below being right after of LCD such as the light source of a plurality of cold-cathode fluorescence lamps.In embodiment 2, with explanation such as the light source of light emitting diode along and near the situation of the side arrangement of optical plate, optical plate is formed for direct light by lucite.

Figure 22 illustrates optical plate 401 as the best illustration of implementing embodiments of the invention 2.Optical plate 401 is used for for example back light unit, and it is backlight as liquid crystal indicator.The material that is used for optical plate 401 comprises acryl resin, comprises the transparent thermoplastic resin in addition, such as methacrylic resin, polystyrene resin, polycarbonate.

Optical plate 401 is to use transparent acrylic resin for example as material injection molding.Optical plate 401 is being reflected into the light that is mapped on the light entrance face 411 at a main surperficial light reflection surface 412 as optical plate 401 on a plurality of directions, so that the light of reflection is from light emergence face 413 evenly light outgoing of conduct.It is meticulous concavo-convex that light reflex face 412 provides, for example prismatic shape pattern, dot pattern etc., thereby so light reflex face 412 handle and enter optical plate 401 and the guiding light by wherein and be elevated to light emergence face 413 effectively.Prismatic shape pattern on light reflection surface 412 and dot pattern use injecting molding die to form.

Optical plate 401 is wedge shapes, thereby when when being inducted into the direction of light that is mapped on the light entrance face 411 and watching, its thickness reduces gradually.But the present invention also can be applied to the optical plate with other structure except that the wedge-like structure.

As the light source of optical plate 401, used the Lights section 420, it has light emitting diode (LED) 421a, 421b, 421c, the 421d that embarks on journey and arrange with predetermined space on substrate 423, as shown in figure 22.All light emitting diode 421a, 421b, 421c, 421d are luminous in the same direction, and their ejaculation surface is represented by 422a, 422b, 422c, 422d respectively.Notice that in the following description, light emitting diode 421a, 421b, 421c, 421d also can be referred to as light emitting diode 421, their ejaculation surface 422a, 422b, 422c, 422d also can be referred to as and penetrate surface 422.Light emitting diode 421 can for example be chip-shaped light emitting diode.

The pitch that light emitting diode 421 is arranged on the substrate 423 is determined by the size of optical plate 401 and the quantity of employed light emitting diode 421.For example, light emitting diode 421 with the spacing arrangement of for example 14mm or 6mm on substrate 423.Notice that the present invention is not subject to the pitch of arranging light emitting diode 421.Therefore, no matter light emitting diode 421 with which kind of pitch is arranged on the substrate 423, and the present invention also can work effectively.

The Lights section 420 arranges with respect to optical plate 401, makes the ejaculation surface 422 of the light emitting diode 421 on the Lights section 420 contact closely with the light entrance face 411 of optical plate 401.For example, as shown in figure 22, double sticky tape bonds along " x " marked region on the substrate 423 of the Lights section 420, is used to adhere to the position of optical plate 401, this position does not influence the light reflection towards light reflection surface 412, the Lights section 420 can attach on the optical plate 401 thus.

And perhaps, optical plate 401 and the Lights section 420 can dispose to make that when in the framework that is contained in back light unit, the light entrance face 411 of optical plate 401 contacts closely with the ejaculation surface 422 of light emitting diode 421.

In Figure 22, in that each is all represented the ejaculation surface 422 and light entrance face 411 close position contacting of light emitting diode 421 when optical plate 401 is attached to the Lights section 420 as mentioned above on the light entrance face 411 of optical plate 401 by position 411a, 411b, 411c, the 411d of dotted line.

Water between the position 411b and 411c on the light entrance face 411 that interruption-forming thing 415 still is retained in optical plate 401.Water interruption-forming thing 415 and be by the resin that has hardened at the cast gate of injecting molding die when the injection moulding optical plate 401 and form.

Because the interruption-forming thing 415 that waters that keeps on optical plate 401 is waste materials completely, thus when with injection molding goods when running channel separates, usually with its cutting-out, and grind in case of necessity, thereby do not remain on the goods of moulding as far as possible.

The interruption-forming thing 415 that waters that is formed on the light entrance face 411 of optical plate 401 is contained in when the Lights section 420 is attached to optical plate 401 between light emitting diode 421b and the 421c, does not therefore hinder.In addition, water interruption-forming thing 415 and on the luminous direction of light emitting diode 421, do not exist, therefore in no case exist the possibility of optical plate 401 guiding incident lights with the infringement of the function that is used for surface emitting.

Described with reference to prior art, if the cast gate of injecting molding die is positioned on the light entrance face of optical plate to be formed, require so after the formed cutting technique that waters the interruption-forming thing of cutting cast gate, to carry out glossing.

Yet the position of the cast gate by determining injecting molding die makes that watering interruption-forming thing 415 is formed on the position of not arranging light emitting diode 421, on the light entrance face 411 of optical plate 401, can only cut the cast gate cutting technique that waters interruption-forming thing 415.And, this cast gate cutting technique may not need accuracy so that water the interruption-forming thing very cut near the position of optical plate 401, but be enough to the residual interruption-forming thing 415 that waters on light entrance face 411, be thick undesirable root as light emitting diode 421 when light ejaculation direction is watched, for example about 1mm is thick.

The injecting molding die that is used for injection moulding optical plate 401 comprises the cavity of the optical plate 401 that is used to form as shown in figure 22 and is used to form the cast gate that waters interruption-forming thing 415.As mentioned above, when the Lights section 420 was attached to injection molding optical plate 401, the cast gate of injecting molding die was arranged on the position of not arranging light emitting diode 421 on the light entrance face 411.

And hope is the centre that the cast gate of injecting molding die is arranged on the light entrance face 411 of optical plate to be formed 401, makes the melted material that is used for cavity filling be diffused into whole cavity equably.

In example shown in Figure 22, wherein have the light emitting diode 421 of even number the Lights section 420, fortunately be, have idle cavity in the centre of the light entrance face 411 of optical plate 401, light emitting diode 421 is not set.Therefore, making injecting molding die makes cast gate be arranged on to wait to arrange between the position 411b and 411c at light emitting diode 421b and 421c place.

Figure 23 illustrates the situation that has the odd number light emitting diode in the Lights section.As shown in figure 23, the Lights section 440 has with preset space length and is arranged in three light emitting diode 441a, 441b and 441c on the substrate 443.Represent that at the position 431a, the 431b that illustrate on the light entrance face 431 of the wedge shaped light guide plate 430 that is similar to optical plate 401 and 431c light emergence face 442 when light emitting diode is attached to the position of light emitting diode 441a, 441b and 441c when closely contacting each other on the light entrance face 431 of optical plate 430.

Because light emitting diode 441b is arranged in the centre of light entrance face 431, so cast gate can not be formed on herein.Therefore, the position of the cast gate setting of injecting molding die makes can have the interruption-forming of watering thing 435a or 435b, it forms when melted material is injected cavity filling by cast gate, that is, and perhaps between position 431a and the 431b or between position 431b and 431c.Therefore, the melted material of filling injection mould can be diffused in the cavity substantially equably.

Thereby the inside surface of cavity of injecting molding die that is used to form the light reflective surface 412 of optical plate 401 provides meticulous concavo-convex formation prismatic shape pattern, dot pattern etc. and brings up to light emergence face 413 effectively will guide by the light of optical plate 401, and is as implied above.Transfer to the melted material of packing into and, on light reflective surface 412, formed various patterns by the shape that these are concavo-convex then with the melted material sclerosis.

When in fact optical plate 401 forms by injecting molding die, except that watering interruption-forming thing 415, also formed running channel part 416, as shown in figure 24.Running channel part 416 is that the melted material of for example melting propylene acid resin is formed by running channel when the melted material supply source supplies to injecting molding die, and is and waters interruption-forming thing 415 similar waste materials.Have the only optical plate 401 that waters interruption-forming thing 415 and running channel part 416 although figure 24 illustrates, in fact can form a plurality of optical plates 401 simultaneously.

The melted material of supplying with from the melted material supply source little by little is injected into the cavity of injecting molding die by running channel and cast gate.When for example melted material of melting propylene acid resin is injected in this cavity, temperature and pressure is set at suitable value controls.

When finishing to be injected into melted material in the cavity and this melted material when in cavity, cooling off, remove injecting molding die, carry out cutting technique in the position that the described arrow A of Figure 24 is referred to then, will have the optical plate 401 that waters interruption-forming thing 415 thus and separate from running channel part 416.

As mentioned above, when adhesioluminescence diode 421, water interruption-forming thing 415 neither the guiding that does not also influence light fully of obstruction property.Therefore, have the optical plate 401 that waters interruption-forming thing 415 and will be used for the back light unit of liquid crystal display like this.

The back light unit 471 that comprises above-mentioned optical plate 401 and the Lights section 420 as shown in figure 25.In back light unit 471, the Lights section 420 is arranged in a side of the light entrance face 411 of optical plate 401, and reflector plate 481 is arranged in a side of the light reflection surface 412 of optical plate 401, and diffusion disk 482, first prismatic lens 483, second prismatic lens 484 are stacked on a side of the light emergence face 413 of optical plate 401 in regular turn each other.The optical plate 401 of Bu Zhiing, the Lights section 420, reflector plate 481, diffusion disk 482, first prismatic lens 483, second prismatic lens 484 fit together in the framework 485,486 as shell backlight in known manner thus, and reflector plate 481 is positioned on framework 486 1 sides in the mode that does not influence.

Much less, be applied to diffusing globe of the present invention described in the foregoing description 1 or can perhaps can using together by being used for replacing diffusion disk 482, first prismatic lens 483, second prismatic lens 484 with these sheets.

471 permissions backlight like this enter the light entrance face 411 of optical plate 401 from the light of light emitting diode 421 emissions of the Lights section 420, guiding is by optical plate 401, and, cause light thus from light emergence face 413 outgoing at light reflection surface 412 and reflector plate 481 these light of reflection.The light that penetrates from light emergence face 413 is uniform light by diffusion disk 482 diffusions.Then, by first prismatic lens 483 and second prismatic lens 484, the level and the vertical component of light focus in vertical direction, promptly on perpendicular to the direction from the light incident direction of light emitting diode 421.The light that is penetrated by second prismatic lens is from the opening 485A outgoing of framework 485, for example to incide on the liquid crystal display.

Even use as shown in figure 23 optical plate 430 and during light source 440, other configuration backlight and light path and backlight 471 those are just the same, and omitted explanation to them.

Then, the injection molding wedge shaped light guide plate of injecting molding die is used in preparation, this mould is provided with cast gate in the position of the light entrance face of not arranging light emitting diode, and the injection molding such wedge shaped light guide plate of injecting molding die is used in preparation, this mould is provided with cast gate being parallel to be inducted on the side surface that is mapped to the direction of light on the light incident surface, and their brightness is measured.Note,, use the melting propylene acid resin to be used as melted material in these two kinds of situations.

At first, explanation is used the wedge shaped light guide plate of the injecting molding die preparation that on light entrance face, has cast gate.As shown in figure 26, optical plate 501 moulding like this are made that the width from light entrance face 551 to the reflective plane of incidence 552 is 30mm, from the side 553 to the side 554 width is 35mm, light entrance face 55 1 has the size of 25mm * 1mm, the reflective plane of incidence 552 has the size of 35mm * 0.3mm.

Be used for light is transmitted into the light emitting diode that the Lights section 560 on the optical plate 501 is included in 4 chip types on the substrate 563, i.e. light emitting diode 561a, 561b, 561c and 561d.Each light emitting diode has the size of 1mm * 2mm * 1mm.

The Lights section 560 is attached to the light reflection surface 557 of optical plate 501 along " x " marked region on the substrate 563 by double sticky tape.At this moment, light emergence face 562a, 562b, 562c and the 562d of light emitting diode attach to the light entrance face 551 of optical plate 501, thus closely contact with it.

Residual by the formed interruption-forming thing 555 that waters of the cast gate of injecting molding die between the position 551b of the light entrance face 551 of optical plate 501 and 551c.Because the distance between position 551b and the 551c is about 3mm, and the thickness of light entrance face 551 is 1mm, thus wherein water interruption-forming thing 555 and light entrance face 551 contacted zones less than these sizes.

And, watering interruption-forming thing 555 and blocked height into 1mm, it equals each light emitting diode and penetrates the size that direction is watched, i.e. 1mm at light.

To the brightness measurement result of the light that penetrates from light emergence face 556 as shown in figure 27, this measurement result is to obtain causing when the Lights section 560 emission light that adhere to as mentioned above enter the light entrance face 551 of optical plate 501 as shown in figure 26.In Figure 27, each level line is represented identical luminance level, can form substantially concentric ellipse by these level lines by it.Therefore, can think at the optical plate 501 that do not had under the situation of non-homogeneous transfer injection moulding satisfactorily.

Next, explanation is used the wedge shaped light guide plate of the injecting molding die preparation that on the side, has cast gate.As shown in figure 28, optical plate 570 has the size identical with the described optical plate of Figure 26 501.That is, the width from light entrance face 571 to the reflective plane of incidence 572 is 30mm, from the side 573 to the side 574 width is 35mm, and light entrance face 571 has the size of 25mm * 1mm, the reflective plane of incidence 572 has the size of 35mm * 0.3mm.

Optical plate 570 aspect the outward appearance different on following 2 with optical plate 501: do not have the interruption-forming of watering thing on the light entrance face 571 of optical plate 570 at them, but have cast gate excision mark 573A, its indication has been excised cast gate from this position on side 573.

Be attached to optical plate 570 with reference to the described the Lights section 560 of Figure 26, thereby use double sticky tape light emergence face 562a, 562b, 562c and 562d and the light entrance face 571 of light emitting diode are combined closely with the similar mode of optical plate 501.

The brightness measurement result of the light that penetrates from light emergence face 556 then by light reflection surface 575 reflection as shown in figure 29, this measurement result is to obtain causing when the Lights section 560 emission light that adhere to as mentioned above enter the light entrance face 571 of optical plate 570 as shown in figure 28.

As shown in figure 29, level line does not form substantially concentric ellipse, and brightness is irregular in by solid line and the area surrounded X of shade institute as can be seen from this figure.X is consistent with gate location in the zone.Because molten resin is to pack under high pressure in this position, so inhomogeneous with respect to the degree that shifts between the left side of light incident direction and the right side.That is, can see non-homogeneous transfer is taking place, cause brightness to change.

From The above results as can be seen, injection molding optical plate 501 does not have transfer heterogeneous by have the injecting molding die of cast gate between the position of light entrance face 551 551b and 551c, thereby performance place excellent luminance characteristic remains on the light entrance face 551 even water interruption-forming thing 555.

Claims (35)

1, a kind ofly be used for the backlight of liquid crystal indicator, be used to illuminate described liquid crystal indicator, it is characterized in that comprising:

Radiative light source; And

Be arranged on the diffusing globe between described light source and the described liquid crystal indicator,

Wherein, described diffusing globe comprises diffusing layer and light distribution layer, described diffusing layer is used for the light of diffusion from described light emitted, and described smooth distribution layer with described diffusing layer integrally formed and be provided with than described diffusing layer more towards described liquid crystal indicator, be used for the light of described diffusing layer diffusion is distributed to described liquid crystal indicator.

2, backlight according to claim 1 is characterized in that:

Described smooth distribution layer has the prismatic shape surface at it on the surface of described liquid crystal indicator.

3, backlight according to claim 1 is characterized in that:

Described diffusing layer comprises diffuse component, and

The part of the diffusing layer of formation except that described diffuse component and first resin of described smooth distribution layer are different with second resin that forms described diffuse component.

4, backlight according to claim 3 is characterized in that:

The scope of the refraction coefficient of described first resin is 1.2 to 1.7.

5, backlight according to claim 3 is characterized in that:

The scope of the refraction coefficient of described second resin is 1.2 to 1.7.

6, backlight according to claim 1 is characterized in that:

Described diffusing globe also comprises the light focus layer, is used to focus on the light of emission from described light source, and is integrally formed with described diffusing layer, and be provided with than described diffusing layer more towards described light source.

7, backlight according to claim 6 is characterized in that:

Described smooth focus layer has prismatic shape on the surface of described light source.

8, backlight according to claim 7 is characterized in that:

Described prismatic shape is made of a plurality of different prisms that the distance from described light source defines.

9, backlight according to claim 6 is characterized in that:

Described diffusing layer comprises diffuse component, and

First resin of the part of the diffusing layer of formation except that described diffuse component, described smooth distribution layer and described smooth focus layer is different with second resin that forms described diffuse component.

10, backlight according to claim 9 is characterized in that:

The scope of the refraction coefficient of described first resin is 1.2 to 1.7.

11, backlight according to claim 9 is characterized in that:

The scope of the refraction coefficient of described second resin is 1.2 to 1.7.

12, a kind of method that is formed for the diffusing globe backlight of liquid crystal indicator, the described described liquid crystal indicator that is used to illuminate backlight, described method is characterised in that and comprises:

First step of packing into is with first resin, first right cylinder of packing into;

Second step of packing into is with first resin that has wherein mixed second resin that is different from described first resin, second right cylinder of packing into;

First forming step, use wherein by described first packed into first right cylinder of described first resin and of step of packing into wherein by described second packed into second right cylinder of first resin that mixed described second resin of step of packing into, by the multilayer extrusion molding, come moulding to comprise described first resin and the double-layer tablet of having mixed first resin of described second resin; And

Second forming step by surperficial roll-in, is shaped to prismatic shape with first resin surface of the sheet of the described first forming step moulding.

13, a kind of method that is formed for the diffusing globe backlight of liquid crystal indicator, the described described liquid crystal indicator that is used to illuminate backlight, described method is characterised in that and comprises:

First step of packing into is with first resin, first right cylinder of packing into;

Second step of packing into is with first resin that has wherein mixed second resin that is different from described first resin, second right cylinder of packing into;

The 3rd step of packing into is with described first resin three cylindrical body of packing into;

First forming step, use wherein by described first pack into step packed into first right cylinder of described first resin, wherein by described second packed into second right cylinder of first resin that mixed described second resin and of step of packing into wherein by the described the 3rd packed into the three cylindrical body of described first resin of step of packing into, by the multilayer extrusion molding, come the moulding three-layer tablet, wherein said three-layer tablet is formed by described first resin, first resin that has mixed described second resin and described first resin, and two surface that appears is formed by described first resin;

Second forming step, by surperficial roll-in, the surface forming of the layer that described first resin of the sheet of the described first forming step moulding is formed is a prismatic shape; And

The 3rd forming step, by surperficial roll-in, the surface forming of the layer that another described first resin of the sheet of the described first forming step moulding is formed is a prismatic shape.

14, a kind of method that is formed for the diffusing globe backlight of liquid crystal indicator, described backlight providing is used to illuminate liquid crystal indicator, and described method is characterised in that and comprises:

Blend step, with second mixed with resin in first resin;

First forming step is a sheet with first resin forming that has wherein mixed described second resin; And

Second forming step uses the 2P forming method that described prismatic shape first resin forming must be contacted with the surface of sheet by the described first forming step moulding and and become one.

15, according to the method for the manufacturing diffusing globe of claim 14, it is characterized in that also comprising:

The 3rd forming step uses the 2P forming method that described prismatic shape first resin forming must be contacted with other surface of sheet by the described first forming step moulding and become one.

16, a kind of liquid crystal display is characterized in that comprising:

Liquid crystal indicator; And

Be used to illuminate the backlight of described liquid crystal indicator,

Wherein, described backlight comprising: radiative light source; And be arranged on diffusing globe between described light source and the described liquid crystal indicator, and

Wherein, described diffusing globe comprises diffusing layer and light distribution layer, described diffusing layer is used for the light of diffusion from described light emitted, and described smooth distribution layer with described diffusing layer integrally formed and be provided with than described diffusing layer more towards described liquid crystal indicator, be used for the light of described diffusing layer diffusion is distributed to described liquid crystal indicator.

17, as the liquid crystal display of claim 16, it is characterized in that:

Described diffusing globe also comprises the light focus layer, is used to focus on the light of emission from described light source, and is integrally formed with described diffusing layer, and be provided with than described diffusing layer more towards described light source.

18, a kind ofly be used for the backlight of liquid crystal indicator, be used to illuminate liquid crystal indicator, it is characterized in that comprising:

Radiative light source; And

Be arranged on the diffusing globe between described light source and the described liquid crystal indicator,

Wherein, described diffusing globe comprises light focus layer and light distribution layer, described smooth focus layer is used to focus on the light of emission from described light source, and described smooth distribution layer with described smooth focus layer integrally formed and be provided with than described smooth focus layer more towards described liquid crystal indicator, be used for the light that described smooth focus layer focuses on is distributed to described liquid crystal indicator.

19, backlight according to claim 18 is characterized in that:

Described smooth distribution layer has the prismatic shape surface at it on the surface of described liquid crystal indicator.

20, backlight according to claim 18 is characterized in that:

Described smooth focus layer has the prismatic shape surface at it on the surface of described light source.

21, a kind of liquid crystal display is characterized in that comprising:

Liquid crystal indicator; And

Be used to illuminate the backlight of described liquid crystal indicator,

Wherein, described backlight comprising: radiative light source; And be arranged on diffusing globe between described light source and the described liquid crystal indicator, and

Wherein, described diffusing globe comprises light focus layer and light distribution layer, described smooth focus layer is used to focus on the light of emission from described light source, and described smooth distribution layer with described smooth focus layer integrally formed and be provided with than described smooth focus layer more towards described liquid crystal indicator, be used for the light that described smooth focus layer focuses on is distributed to described liquid crystal indicator.

22, a kind of optical plate with light entrance face is used to guide the light from a plurality of light-emitting device emissions, and described a plurality of light-emitting devices are arranged on the longitudinal direction of described light entrance face with predetermined space with embarking on journey, are used for surface emitting, it is characterized in that:

Cast gate is arranged on the position of the light entrance face of not arranging described a plurality of light-emitting devices, by described cast gate melted material is packed to come into the cavity of filling injection mould in the process of the described optical plate of injection moulding.

23, a kind of optical plate with light entrance face, be used to guide light from a plurality of light-emitting device emissions, described a plurality of light-emitting device is arranged on the longitudinal direction of described light entrance face with predetermined space with embarking on journey, be used for surface emitting, and be the wedge shape that its thickness reduces on the described direction of light that is directed of guiding gradually, it is characterized in that:

Cast gate is arranged on the position of the light entrance face of not arranging described a plurality of light-emitting devices, by described cast gate melted material is packed to come into the cavity of filling injection mould in the process of the described optical plate of injection moulding.

24, according to the optical plate of claim 23, it is characterized in that:

If a plurality of light-emitting devices of even number are arranged on the longitudinal direction of described light entrance face with predetermined space with embarking on journey, be used for surface emitting, so gate placement the longitudinal direction of described light entrance face near the position between two light emitting devices at center, do not arrange described a plurality of light-emitting device in described position.

25, according to the optical plate of claim 23, it is characterized in that:

If a plurality of light-emitting devices of odd number are arranged on the longitudinal direction of described light entrance face with predetermined space with embarking on journey, be used for surface emitting, gate placement is not arranged described a plurality of light-emitting device at the light emitting devices at the center of the longitudinal direction of described light entrance face and described between an adjacent light-emitting device of the light-emitting device at center in described position so.

26, according to the optical plate of claim 23, it is characterized in that:

Described a plurality of light-emitting device is light emitting diode (LED).

27, a kind of backlight, it is characterized in that comprising:

Optical plate is used to guide the light that is incident on the light entrance face, is used for the surface emitting from light emergence face;

Light source has with predetermined space and is arranged in a plurality of light-emitting devices on the longitudinal direction of light entrance face of described optical plate with embarking on journey;

Reflector plate is arranged on the side of light reflection surface of described optical plate;

Sheet element is formed by diffusion disk and prismatic lens, is provided with on the side of the light emergence face that is stacked on described optical plate;

Framework is used for described light source, emission sheet and sheet element are remained on described optical plate,

Wherein, described optical plate has cast gate, is arranged on the position of the light entrance face of not arranging described a plurality of light-emitting devices, by described cast gate melted material is packed to come into the cavity of filling injection mould in the process of the described optical plate of injection moulding.

28, a kind of backlight, it is characterized in that comprising:

Optical plate is used to guide the light that is incident on the light entrance face, is used for from optical convergence face surface emitting, and is the wedge shape that its thickness reduces on the described direction of light that is directed of guiding gradually;

Light source has with predetermined space and is arranged in a plurality of light-emitting devices on the longitudinal direction of light entrance face of described optical plate with embarking on journey;

Reflector plate is arranged on the side of light reflection surface of described optical plate;

Sheet element is formed by diffusion disk and prismatic lens, is provided with on the side of the light emergence face that is stacked on described optical plate;

Framework is used for described light source, emission sheet and sheet element are remained on described optical plate,

Wherein, described optical plate has cast gate, is arranged on the position of the light entrance face of not arranging described a plurality of light-emitting devices, by described cast gate melted material is packed to come into the cavity of filling injection mould in the process of the described optical plate of injection moulding.

29, backlight according to claim 28 is characterized in that:

If being arranged in predetermined space on the longitudinal direction of described light entrance face with embarking on journey, a plurality of light-emitting devices of the even number of described light source are used for surface emitting, so described optical plate has the cast gate that is arranged near the position between two light emitting devices at the center of the longitudinal direction of described light entrance face, does not arrange described a plurality of light-emitting device in described position.

30, backlight according to claim 28 is characterized in that:

If being arranged in predetermined space on the longitudinal direction of described light entrance face with embarking on journey, a plurality of light-emitting devices of the odd number of described light source are used for surface emitting, so described optical plate has light emitting devices and the described cast gate between an adjacent light-emitting device of the light-emitting device at center that is arranged at the center of the longitudinal direction of described light entrance face, does not arrange described a plurality of light-emitting device in described position.

31, backlight according to claim 28 is characterized in that:

Described a plurality of light-emitting device is light emitting diode (LED).

32, a kind of preparation has the method for the optical plate of light entrance face, described optical plate is used to guide the light from a plurality of light-emitting device emissions, described a plurality of light-emitting device is arranged in predetermined space on the longitudinal direction of described light entrance face with embarking on journey and is used for surface emitting, it is characterized in that:

Pack into to come the cavity of filling injection mould to come the injection moulding optical plate melted material by cast gate, described cast gate is arranged on the position of the light entrance face of not arranging described a plurality of light-emitting device parts.

33, a kind of preparation has the method for the optical plate of light entrance face, described optical plate is used to guide the light from a plurality of light-emitting device emissions, described a plurality of light-emitting device is arranged in predetermined space on the longitudinal direction of described light entrance face with embarking on journey and is used for surface emitting, and be the wedge shape that its thickness reduces on the described direction of light that is directed of guiding gradually, it is characterized in that:

Pack into to come the cavity of filling injection mould to come the injection moulding optical plate melted material by cast gate, described cast gate is arranged on the position of the light entrance face of not arranging described a plurality of light-emitting device parts.

34, according to the method for preparing optical plate of claim 33, it is characterized in that:

If being arranged in predetermined space on the longitudinal direction of described light entrance face with embarking on journey, a plurality of light-emitting devices of even number are used for surface emitting,

Pack into to come the cavity of filling injection mould to come the described optical plate of injection moulding melted material by described cast gate so, described gate placement is not arranged described a plurality of light-emitting device near the position between two light emitting devices at the center of the longitudinal direction of described light entrance face in described position.

35, according to the method for preparing optical plate of claim 33, it is characterized in that:

If being arranged in predetermined space on the longitudinal direction of described light entrance face with embarking on journey, a plurality of light-emitting devices of odd number are used for surface emitting,

Pack into to come the cavity of filling injection mould to come the described optical plate of injection moulding melted material by described cast gate so, described gate placement is not arranged described a plurality of light-emitting device at the light emitting devices at the center of the longitudinal direction of described light entrance face and described between an adjacent light-emitting device of the light-emitting device at center in described position.

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