CN207318767U - A kind of optical point and light guide plate - Google Patents

Abstract

The utility model provides a kind of optical point and the light guide plate comprising the optical point, which includes fringe region and ring central area and central area, and the fringe region protrudes plane where the optical point；The ring central area is recessed relative to the fringe region to be set；The central area is protruded relative to the ring central area to be set, and the central area, ring central area and the fringe region are outwards laid successively by the central point of the optical point.The utility model is by the way that the fringe region ring central area of optical point and central area bumps are arranged, total reflection can be destroyed when light is incident on optical point surface and produces refraction and reflection, it is small to realize light conduction loss, the advantages of light briliancy is good, by setting the volcano degree of lip-rounding and seamlessly transitting, optical diffuser loss is further reduced, reaches the uniform effect of printing opacity.

Description

A kind of optical point and light guide plate

Technical field

The present invention relates to planar light source technical field, more particularly to a kind of optical point and light guide plate.

Background technology

The backlight module (BLU) of the planar light source such as flat lamp or liquid crystal display (LCD)) common white light LEDs mixed light frame Structure, it is to send the blue light that wavelength is about 400nm~500nm by LED chip, and centre wavelength is about 465nm, and outside chip Covering layer of fluorescent powder structural material is enclosed, sodium yellow, then the blue light with being directed through are sent via blue light excitation fluorescent material It is mixed to form white light.The LED presentations that shine are a kind of point light source kenels, it is desirable to point light source is converted into zero diopter source kenel, it is such as attached Shown in Fig. 1, the total reflection conduction light of planar lightguide need to be applied, recycles the optical point on light guide plate to destroy total reflection, will Light reflects or reflects light guide plate, and whole face is presented on planar lightguide and uniformly goes out light state.

As shown in Figure 2, new quantum dot (QD, Quantum Dots) planar light source is to pass through leaded light using blue-light source After plate becomes uniform surface light, one layer of quantum dot diaphragm (QD film) is added on plane blue light, blue light is converted to white light.

As shown in Figure 3, light guide plate material is high molecule plastic, and the refractive index of optical material changes referred to as with wavelength Dispersion (dispersion), for visible ray (wavelength is 380nm~700nm), the different absorptivities based on wavelength are different, refraction Decline trend is presented in rate.Since the spatial distribution of white light LEDs is mainly made of 2 wave band peak values, when light passes through light guide plate, Light guide plate refractive index, which is corresponded to, in blue optical band is more than average value, yellow optical band corresponds to light guide plate refractive index and is less than average value, Therefore the loss of blue light is higher than sodium yellow.

Light conducts in light guide plate can produce loss, can decline light efficiency apart from elongated with conducting, use Light efficiency is calculated after Tracepro simulation softwards than result as shown in Figure 4.Different spectrum are used on identical light guide panel material LED light source, light efficiency are different, during using white light LEDs, average light efficiency 52.8%, and during using blue-ray LED, average light efficiency 53.5%, Compare conduction apart from light efficiency distribution curve, as shown in Figure 4 on the basis of light conducts distance center, white light conducts in light guide plate It is 5.6% to be conducted by light apart from the small light efficiency mean difference to light conduction distance greatly i.e. from the face of entering the GATT to anti-incidence surface, blue light Light efficiency mean difference is 6.6%, and the conduction distance of blue light influences light efficiency and is more than white light.

As shown in figure 5, the name definition of light guide plate optical surface is incidence surface, reflecting surface, light-emitting surface, anti-incidence surface and side Face.The structure of emergent light surface of conventional light guiding plate is minute surface, it is with equally distributed micro-structure, the light-outlet-surface light-guide plate of this structure Optical advantage be that the light conducted in light guide plate directly can be changed into conduction orientation according to surface curvature, light guide plate light-emitting surface is micro- Planform is defined according to design and processing procedure, and attached drawing 6 is a kind of microstructure aspects figure of light-emitting surface.

The optical design of light guide plate is mainly to plan the optical point distribution of the destruction total reflection set on reflecting surface, and design is micro- Structure light guide plate must be analyzed according to optical effect caused by the architectural characteristic, i.e., light intensity distributions of conduction in light guide plate, Light guide plate nature light extraction, the light angle for adjusting out light guide plate.In analysis light guide plate because structure of emergent light surface influences and then carries out Reflecting surface optical point, to reduce light conduction loss in light guide plate, and obtains the suitable light extraction of briliancy.Therefore reflecting surface light It is particularly important Development Technology to learn point.

Based on this, the prior art is really to be improved.

The content of the invention

The technical problem that the present invention need to solve is to provide a kind of optical point, and the light guide plate using this optical point.

To solve the above-mentioned problems, the present invention provides a kind of optical point, and the technical solution that it is taken is as follows：

A kind of optical point, including：

Fringe region, the fringe region protrude plane where the optical point；

Ring central area, the ring central area is recessed relative to the fringe region to be set；

Central area, the central area is protruded relative to the ring central area to be set；Also,

The central area, ring central area and the fringe region by the central point of the optical point outwards successively Lay.

Further, the central area, ring central area, fringe region junction seamlessly transit, and the optical point Just it is being considered as volcanic crater shape.

Further, the ring central area is recessed into the plane, and the plane is protruded in the central area.

Further, the optical point surface profile is continuous progressive curved surface.

Further, during white light source, white light conduction 0~300mm of distance is light incidence section, and 300~400mm transfers to be middle Area, be linear zone after 400mm, using light incidence section as initial value 1, the light incidence section optical point area ratio change rate is 1~ 1.65 times, the optical point area ratio change rate of the middle break over region is 1.65~2.1 times, the optical point face of the linear zone Product ratio change rate y=0.0068x-0.51+k, wherein, y can have ± 10% offset, and y is multiplying power, and x conducts distance, k for light Continue constant for curve.

Further, when blue-light source, blue light conduction 0~200mm of distance is light incidence section, and 200~300mm turns to be middle Folding area, be linear zone after 300mm, using light incidence section as initial value 1, the light incidence section optical point area ratio change rate is 1~ 1.28 times, the optical point area ratio change rate of the middle break over region is 1.28~1.67 times, the optical point of the linear zone Area ratio change rate is y '=0.0081x ' -0.9+k ', wherein, y ' can have ± 10% offset, and y ' is multiplying power, and x ' passes for light Lead continues constant from, k ' for curve.

The invention also discloses a kind of light guide plate, it includes above-mentioned optical point.

Further, the optical point is arranged on the reflecting surface of light guide plate.

The beneficial effects of the invention are as follows：

The present invention by the concavo-convex arrangement in the fringe region of optical point, ring central area and central area, light by being incident on light Learn point surface when can destroy total reflection produce refraction and reflection, realize light conduction loss it is small, light briliancy well it is excellent Point, by setting the volcano degree of lip-rounding and seamlessly transitting, further reduces optical diffuser loss, reaches the uniform effect of printing opacity.

Brief description of the drawings

Fig. 1 is the uniform light extraction state diagram of light guide plate of the prior art；

Fig. 2 is the new quantum dot planar light source schematic diagram of the prior art；

Fig. 3 is optical indicatrix figure of the light guide panel material in different wave length；

Fig. 4 is that light conducts distance in light guide plate and light efficiency compares curve map；

Fig. 5 is a kind of structure diagram of light guide plate；

Fig. 6 is a kind of microstructure aspects figure of light-emitting surface of the prior art；

Fig. 7 is the block plan under state of white light in another embodiment of the utility model；

Fig. 8 is the block plan under blue light state in another embodiment of the utility model；

Fig. 9 is the optical point front view of another embodiment of the utility model；

Figure 10 is the sectional view of Fig. 9；

Figure 11 is the briliancy distribution figure of another embodiment of the utility model.

Wherein：1st, incidence surface, 2, light-emitting surface, 3, reflecting surface, 4, anti-incidence surface, 5, side.

Embodiment

With reference to the accompanying drawings and examples, the embodiment of the present invention is described in further detail.

As shown in figure 5, a kind of optical point that one embodiment of the utility model provides, it is arranged on light guide plate, the leaded light Plate includes incidence surface 1, light-emitting surface 2, reflecting surface 3, anti-incidence surface 4, side 5, wherein, it is provided with optics on the reflecting surface Point, the optical point include fringe region and close to and the interior zone that is arranged on inside the fringe region, the marginal zone The reflecting surface is protruded in domain, and the interior zone is recessed relative to the fringe region to be set.The present embodiment is by by optical point Fringe region and the concavo-convex arrangement of interior zone, total reflection can be destroyed when light is incident on optical point surface and produces refraction and instead Penetrate, realize the advantages of light conduction loss is small, and light briliancy is good.

In another embodiment of the present invention, as shown in figure 9, above-mentioned interior zone includes central area and ring central area, The central area, ring central area and the fringe region are outwards laid successively by the central point of the optical point；And The ring central area is recessed relative to the fringe region to be set, and the central area is protruded relative to the ring central area Set.Preferably, the central area, ring central area, fringe region junction seamlessly transit, and the optical point is just considered as The volcano degree of lip-rounding.It is further preferred that the ring central area is recessed into the reflecting surface, the reflection is protruded in the central area Face.

The volcano degree of lip-rounding optical point of the present embodiment can be made in the following way, first, 532nm be excited using laser The light of wavelength is beaten on the steel plate, and the peak power by controlling laser forms sags and crests with pulse number, then is made by heat rolling Journey, the optical point on steel plate is transferred on light guide plate, forms plate upper surface volcano degree of lip-rounding light guiding points.

Volcano degree of lip-rounding optical point is the smooth optical texture in surface, and optical point surface profile is bent in the tortuous bumps in high bottom Face, its cross-section structure is as shown in Figure 10, and total reflection can be destroyed when the light in light guide plate is incident on optical point surface and produces refraction And reflection, because optical point is concavo-convex tortuous change surface, therefore there is the advantages of multiple light refraction angles can directly go out light guide plate, But the light loss of light guide plate also can not be produced relatively.Entire optical profile can be controlled by the size of optical point, with Reach picture homogeneous target.

Specific designing scheme is as follows：

First, anti-incidence surface is transmitted to by incidence surface according to light, the loss in efficiency of light, obtains what light conducted in light guide plate Efficiency distribution curve map, analyzes the efficiency distribution curve map, has one section of flat zone in the curve close to incidence surface, is defined as into light Area；The region that curve produces extreme value flex point is defined as middle break over region；The efficiency curve is after best flex point, linear point Cloth, linear zone is defined as by the region.

Being designed for the optics meter of semi-cylindrical micro-structure (Lenticular) light guide plate, optical point is arranged in reflecting surface, According to light conduction distance and light efficiency than curve, when white light source, as shown in fig. 7, define white light conduction 0~300mm of distance be into Light area is known as A areas, and 300~400mm is known as B areas for middle break over region, is that linear zone is known as C areas after 400mm.By light guide plate Guide-lighting axis, that is, incidence surface is defined as L to anti-incidence surface length, is 3 sections of regions, that is, A areas, B areas and C areas by L points.It is initial using A areas Value 1, optical point area ratio change rate are 1~1.65 times, and 1.65~2.1 times of B areas change rate, C areas change rate follows multiplying power y =0.0068x-0.51+k, y can have ± 10% offset, and y is multiplying power, and x conducts distance for light, and k continues constant for curve.

When blue-light source, as shown in figure 8, blue light 0~200mm of conduction distance is known as A ' areas, 200~300mm for light incidence section It is known as B ' areas for middle break over region, is that linear zone is known as C ' areas after 300mm.Using A ' areas as initial value 1, optical point area ratio Change rate is 1~1.28 times, and 1.28~1.67 times of B ' areas change rate, C areas change rate follows multiplying power y '=0.0081x ' -0.9+ K ', y ' there can be ± 10% offset, y ' be multiplying power, and x ' conducts distance for light, and k ' is that curve continues constant.

In above-described embodiment, light guiding points area ratio can freely define initial point minimum value, coordinate light efficiency loss in leaded light Distribution in plate, defines the area ratio of guide-lighting axis by the A areas planned, starts to transfer to light efficiency loss during B areas, and C areas are by residue Light energy is finished.Advantage be using light guiding points area than change rate can be distributed with qualitative light guide plate optics briliancy, such as Figure 11 It is shown, using the designing scheme light guide plate of blue light LED light source, white light LED light source module is installed on, after central briliancy normalization Briliancy distribution, optics briliancy trend are distributed as central highest, enter light with it is counter enter light it is close and less than center, such as chevron point Cloth.The utility model in optics actual verification can the first edition with regard to can obtain chevron briliancy distribution with highest median, Also it is very helpful in terms of exploitation release is reduced, that is, has the advantages that to reduce development time and cost.

It is pointed out that the light source that the utility model is applicable in includes at least two major classes, one kind is white light LEDs, its wavelength Scope is 430nm~700nm, and one is blue LED wavelength scope 430nm~480nm.Further, the optical point surface wheel Exterior feature is continuous progressive curved surface, by continuous progressive curved design, further reduces optical diffuser loss, the distribution of optics briliancy More preferably, translucent effect is more uniform.Area ratio change rate mentioned in the present invention, refers to the area of optical point relative to the light Learn point the area of plane on the reflecting surface proportionate relationship.I.e. area ratio change rate be equal at optical point coarse area with The ratio of unit area.The present invention is by defining above-mentioned change rate so that light conduction loss is small, and light briliancy is good, leads to Cross setting water-drop-shaped and seamlessly transit, the two effect of be combineding with each other, further reduces optical diffuser loss, it is uniform to reach printing opacity Effect.

Embodiment of above is merely to illustrate the present invention, and not limitation of the present invention, in relation to the common of technical field Technical staff, without departing from the spirit and scope of the present invention, can also make a variety of changes and modification, therefore all Equivalent technical solution falls within scope of the invention, and scope of patent protection of the invention should be defined by the claims.

Claims (8)

1. A kind of 1. optical point, it is characterised in that including：

   Fringe region, the fringe region protrude plane where the optical point；

   Ring central area, the ring central area is recessed relative to the fringe region to be set；

   Central area, the central area is protruded relative to the ring central area to be set；Also,

   The central area, ring central area and the fringe region outside cloth successively by the central point of the optical point If.
2. 2. optical point as claimed in claim 1, it is characterised in that the central area, ring central area, fringe region handing-over Place seamlessly transits, and the optical point is just being considered as volcanic crater shape.
3. 3. optical point as claimed in claim 1 or 2, it is characterised in that the ring central area is recessed into the plane, described Protrude the plane in central area.
4. 4. optical point as claimed in claim 1 or 2, it is characterised in that the optical point surface profile is continuous progressive song Face.
5. 5. optical point as claimed in claim 2, it is characterised in that during white light source, white light conduction 0~300mm of distance is into light Area, 300~400mm are middle break over region, and 400mm is later linear zone, using light incidence section as initial value 1, the light incidence section optics Point area ratio change rate is 1~1.65 times, and the optical point area ratio change rate of the middle break over region is 1.65~2.1 Times, the optical point area ratio change rate y=0.0068x-0.51+k of the linear zone, wherein, y can have ± 10% offset, y For multiplying power, x conducts distance for light, and k continues constant for curve.
6. 6. optical point as claimed in claim 2, it is characterised in that when blue-light source, blue light conduction 0~200mm of distance be into Light area, 200~300mm are middle break over region, and 300mm is later linear zone, using light incidence section as initial value 1, the light incidence section light It is 1~1.28 times to learn a point area ratio change rate, the optical point area ratio change rate of the middle break over region for 1.28~ 1.67 times, the optical point area ratio change rate of the linear zone is y '=0.0081x ' -0.9+k ', wherein, y ' can have ± 10% offset, y ' be multiplying power, and x ' conducts distance for light, and k ' is that curve continues constant.
7. 7. a kind of light guide plate, it is characterised in that including any optical points of claim 1-6.
8. 8. light guide plate as claimed in claim 7, it is characterised in that the optical point is arranged on the reflecting surface of the light guide plate On.