CN207408618U - 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 interior zone, and the fringe region protrudes plane where the optical point；The interior zone is close to the fringe region and is arranged on inside the fringe region, and the interior zone is recessed compared with the fringe region to be set.The utility model is by the way that the fringe region of optical point and interior zone bumps are arranged, total reflection can be destroyed when light is incident on optical point surface and generates refraction and reflection, it is small to realize light conduction loss, the advantages of light briliancy is good, by setting water-drop-shaped and seamlessly transitting, optical diffuser loss is further reduced, reaches the uniform effect of light transmission.

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 sources such as flat lamp or liquid crystal display (LCD)) common white light LEDs mixed light frame Structure 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, the optical point on light guide plate is recycled to destroy total reflection, it 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 made to be 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 is corresponded to more than average value in blue optical band, 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 generate 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, with equally distributed micro-structure, the light-outlet-surface light-guide plate of this structure Optical advantage be that can the light conducted in light guide plate directly 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 and acquisition suitable light extraction of briliancy in light guide plate.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 issues of 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 taken is as follows：

A kind of optical point, including：

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

Interior zone, the interior zone is close to the fringe region and is arranged on inside the fringe region, described interior Portion region is recessed compared with the fringe region to be set.

Further, the fringe region and the interior zone junction seamlessly transit, and the optical point is just considered as Water-drop-shaped.

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

Further, during white light source, 0~300mm of white light conduction distance is light incidence section, and 300~400mm transfers to be intermediate Area is linear zone after 400mm, using light incidence section as initial value 1, the light incidence section optical point area ratio change rate is 1~ 1.59 times, intermediate 1.59~2.2 times of the break over region area ratio change rate, the linear zone area ratio change rate y= 0.0044x+0.23+k, wherein, y can have ± 10% offset, and y is multiplying power, and x conducts distance for light, and k continues constant for curve.

Further, during blue-light source, 0~200mm of blue light conduction distance is light incidence section, and 200~300mm transfers to be intermediate Area is 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, 1.28~1.59 times of the optical point area ratio change rate of the intermediate break over region, the optical point face of the linear zone Product ratio change rate y '=0.0063x ' -0.38+k ', wherein, y ' can have ± 10% offset, and y ' is multiplying power, and x ' conducts for light Distance, k ' continue constant for curve.

The invention also discloses a kind of light guide plate, including 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 is by by the concave-convex arrangement of the fringe region of optical point and interior zone, when light is incident on optical point surface i.e. Total reflection can be destroyed and generate refraction and reflection, the advantages of light conduction loss is small, and light briliancy is good is realized, by setting water It drips shape and seamlessly transits, be further reduced optical diffuser loss, reach the uniform effect of light transmission.

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 graph；

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 optical point front view of one embodiment of the utility model；

Fig. 8 is the sectional view of Fig. 7；

Fig. 9 is the block plan under state of white light in another embodiment of the utility model；

Figure 10 is the block plan under blue light state in another embodiment of the utility model；

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.

Specific embodiment

With reference to the accompanying drawings and examples, the specific 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, 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, optical point, institute are set on the reflecting surface State optical point include fringe region and close to and the interior zone that is arranged on inside the fringe region, the fringe region protrusion The reflecting surface, the interior zone is recessed compared with the fringe region to be set.The present embodiment is by by the edge of optical point Region and the concave-convex arrangement of interior zone, can destroy total reflection and generate refraction and reflection, realize when light is incident on optical point surface The advantages of light conduction loss is small, and light briliancy is good.

Preferably, as shown in fig. 7, on the basis of above-described embodiment, the fringe region and interior zone handing-over Place seamlessly transits, and the optical point is just considered as water-drop-shaped.Preferably, the interior zone is recessed into the reflecting surface.

The optical point of above-mentioned water-drop-shaped can obtain in the following way：Using CO₂Laser excites 10,600nm wavelength Light beat on light guide plate, cause plate upper surface notch i.e. light guiding points prototype, then control laser mean power and pass through The position of mobile laser and speed, so as to form the water-drop-shaped light guiding points for needing size and shape.

Water-drop-shaped optical point is the smooth optical texture in surface, and optical point surface profile is continuous progressive curved surface, is cutd open Face structure generates refraction and reflection as shown in figure 8, can destroy total reflection when the light in light guide plate is incident on optical point surface, because Light guiding points are continuous and derivable surfaces, therefore have the advantages of optical diffuser loss is less.It can be controlled by the size of optical point Entire optical profile, to reach the uniform target of picture.

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 graph analyzes the efficiency distribution graph, has one section of flat zone in the curve close to incidence surface, is defined as into light Area；The region that curve generates extreme value inflection point is defined as intermediate break over region；The efficiency curve is after best inflection point, linear point The region is defined as linear zone by cloth.

For semi-cylindrical micro-structure (Lenticular) light guide plate, when white light source, optical point is arranged in reflecting surface, such as Shown in Fig. 9, according to light conduction distance with light efficiency than curve, definition white light 0~300mm of conduction distance is known as A areas for light incidence section, 300~400mm is known as B areas for intermediate break over region, is that linear zone is known as C areas after 400mm.It is into light by light guide plate leaded light axis Face 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 when white light source Value 1, as minimum reference, optical point area ratio change rate is 1~1.59 times, and 1.59~2.2 times of B areas change rate, C areas become Rate follows multiplying power y=0.0044x+0.23+k, wherein, y can have ± 10% offset, and y is multiplying power, and x conducts distance, k for light It continues constant for curve.

When blue-light source, as shown in Figure 10, 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 intermediate 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 1.28~1.59 times of B ' areas change rate, C areas change rate follows multiplying power y '=0.0063x ' -0.38+ K ', y ' there can be ± 10% offset, y ' is multiplying power, and x ' conducts distance for light, and k ' continues constant for curve.

In above-described embodiment, light guiding points area ratio can freely define initial point minimum value, and cooperation light efficiency loss is 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, It is also very helpful in terms of exploitation release is reduced, that is, has the advantages that reduce development time and cost.

It is pointed out that the light source that is applicable in of the utility model includes at least two major classes, one kind is white light LEDs, 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, is further reduced 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 compared with 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 It crosses setting water-drop-shaped and seamlessly transits, the two effect of be combineding with each other is further reduced optical diffuser loss, it is uniform to reach light transmission 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 (7)

1. a kind of optical point, which is characterized in that including：

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

Interior zone, the interior zone is close to the fringe region and is arranged on inside the fringe region, the inner area Domain is recessed compared with the fringe region to be set.

2. optical point as described in claim 1, which is characterized in that the fringe region and the interior zone junction are smooth Transition, and the optical point is just considered as water-drop-shaped.

3. optical point as claimed in claim 1 or 2, which is characterized in that the optical point surface profile is continuous progressive song Face.

4. optical point as claimed in claim 3, which is characterized in that during white light source, white light conduction 0~300mm of distance is into light Area, 300~400mm are intermediate 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 1~1.59 times, intermediate 1.59~2.2 times of the break over region area ratio change rate, described linear Area area ratio change rate y=0.0044x+0.23+k, wherein, y can have ± 10% offset, and y is multiplying power, x for light conduct away from It continues constant for curve from, k.

5. optical point as claimed in claim 3, which is characterized in that during blue-light source, blue light conduction 0~200mm of distance is into light Area, 200~300mm are intermediate break over region, and 300mm is later linear zone, using light incidence section as initial value 1, the light incidence section optics Point area ratio change rate is 1~1.28 times, 1.28~1.59 times of the optical point area ratio change rate of the intermediate break over region, Optical point area ratio change rate y '=0.0063x ' -0.38+k ' of the linear zone, wherein, y ' can have ± 10% offset, Y ' is multiplying power, and x ' conducts distance for light, and k ' continues constant for curve.

6. a kind of light guide plate, which is characterized in that including any optical points of claim 1-5.

7. light guide plate as claimed in claim 6, which is characterized in that the optical point is arranged on the reflecting surface of the light guide plate On.