CN103064144B - Light guide plate and light emitting device - Google Patents

Abstract

A light guide plate, comprising a light incident surface, on which a microstructure is arranged, and the microstructure comprises a plurality of light guide cylinders protruding relative to the light incident surface, the plurality of light guide cylinders are parallel to each other, each The cross-section of the light guide cylinder is arc-shaped, and the radius is 0.04 micron to 0.07 micron. The invention also provides a light emitting device comprising the light guide plate. The light emitted by the light guide plate provided by the invention is uniform and has high illuminance.

Description

Light guide plate and light emitting device

technical field

The invention relates to a light guide plate and a light emitting device comprising the light guide plate.

Background technique

At present, many electronic devices need light source lighting. In order to reduce the space occupied by the light source, the point light source or line light source is usually expanded into a surface light source through the light guide plate. However, there is usually a hot spot phenomenon at the light entrance of the light guide plate. That is, the light is uneven. Therefore, the light entrance of the light guide plate is usually provided with microstructures to solve the bright spot phenomenon. However, after the microstructures are added to the light entrance, the illuminance will decrease due to light scattering.

Contents of the invention

In view of this, it is necessary to provide a light guide plate and a light emitting device capable of balancing illuminance and bright spots.

A light guide plate, comprising a light-incident surface, on which a microstructure is arranged, and the microstructure comprises a plurality of light-guiding cylinders protruding relative to the light-incident surface, and the plurality of light-guiding cylinders are parallel to each other, each The cross-section of the light guide cylinder is arc-shaped, and the radius is 0.04 micron to 0.07 micron.

Further, the height of the light guiding cylinder relative to the light incident surface is 0.015 micron to 0.06 micron.

A light emitting device, comprising a plurality of light sources and a plurality of light guide plates, the plurality of light guide plates correspond to the plurality of light sources one by one, and each light guide plate is located at the light exit of the corresponding light source, and each light guide plate includes a light incident surface , the light-incident surface is provided with a microstructure, the microstructure includes a plurality of light-guiding cylinders protruding relative to the light-incident surface, the plurality of light-guiding cylinders are parallel to each other, and the cross-section of each light-guiding cylinder is arc-shaped, The radius is 0.04 micron to 0.07 micron.

Further, the height of the light guiding cylinder relative to the light incident surface is 0.015 micron to 0.06 micron.

Further, the light guide plate is in contact with corresponding light sources.

Compared with the prior art, the cross-sectional radius of the light guide column included in the microstructure of the light guide plate provided by the present invention is 0.04 micron to 0.07 micron, which can make the light emitted by the light emitting unit uniform and have high illuminance; the light emitting device provided by the present invention The light guide plate is provided, so the emitted light is uniform and the illuminance is high.

Description of drawings

Fig. 1 is a schematic structural diagram of a light emitting device provided by an embodiment of the present invention.

FIG. 2 is a perspective view of a light guide plate provided by an embodiment of the present invention.

Fig. 3 is a broken line diagram of the illuminance change of the light-emitting device when the height of the light-guiding cylinder remains constant and the cross-sectional radius of the light-guiding cylinder varies between 0.02 microns and 0.10 microns.

Description of main component symbols

light emitting device 10 led 102 light guide plate 20 Light incident surface 201 light emitting surface 202 microstructure 30 Light guide cylinder 301

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

detailed description

Please refer to Fig. 1, an embodiment of the present invention provides a light emitting device 10, the light emitting device 10 includes a plurality of light sources, the present embodiment takes two light emitting diodes 102 as an example, and the front of each light emitting diode 102 (i.e. the place where the light exits) is set There is a light guide plate 20 .

The light guide plate 20 includes a light incident surface 201 and the entire light incident surface 201 is provided with a microstructure 30 , and the microstructure 30 includes a plurality of light guide cylinders 301 protruding relative to the light incident surface 201 . The plurality of light guide columns 301 are parallel to each other. The size of the light guide plate 20 is equal to the light emitting area of a corresponding light emitting diode 102 .

In this embodiment, the plurality of light guide cylinders 301 are distributed continuously. It can also be discontinuously distributed, that is, there are gaps between the plurality of light guide cylinders 301 .

The height H of the light guiding cylinder 301 is the distance between the highest point of the guiding light cylinder 301 relative to the light incident surface 201 and the light incident surface 201 . The cross-section of each light guide cylinder 301 may be in the shape of an arc, and the section radius R below refers to the radius of the arc.

Select a kind of light-emitting diode (the light-emitting diode of model NSSW206T-E is selected here), keep the height H of the light guide cylinder 301 unchanged (measured with a height of 0.05 microns), and the cross-sectional radius R of the light guide cylinder 301 is 0.02 When the illuminance of the light-emitting device 10 varies from micron to 0.10 micron, the variation of illuminance is shown in FIG. 3 and Table 1.

Table 1

Radius (unit: µm) Illumination (unit: lx) Luminous flux (unit: lm) 0.02 6775.98 24.94 0.03 6845.69 25.25 0.04 6878.83 25.37 0.05 6880.20 25.37 0.06 6890.27 25.41 0.07 6902.86 25.46 0.08 6894.04 25.43 0.09 6905.00 25.47 0.1 6905.47 25.47

After testing with a variety of different light sources, it is found that the illuminance reaches saturation when the cross-sectional radius R of the light guiding cylinder 301 is 0.04 microns to 0.07 microns.

Similarly, when the cross-sectional radius R of the light guide cylinder 301 remains constant (measured with a radius of 0.07 microns), and the height of the light guide cylinder 301 varies between 0.015 microns and 0.06 microns, it is found that the illuminance of the light emitting device 10 is 6902 The change between lux and 6914 lux, that is, the change is very small, so the height H has little influence on the illuminance.

In order to reduce the scattering of the light emitted by the light source in the air, the light guide plate 20 can be in contact with the corresponding light source. For example, in this embodiment, the light incident surface 201 of the light guide plate 20 is in contact with the package body of the light emitting diode 102 .

The light guide plate 20 also includes a light exit surface 202 , the light exit surface 202 is parallel to the light entrance surface 201 (as shown in FIG. 1 and FIG. 2 ) or the light exit surface 202 is connected to the light entrance surface 201 .

Compared with the prior art, the microstructure of the light guide plate 20 provided by the present invention includes a cross-sectional radius R of the light guide cylinders of 0.04 microns to 0.07 microns, which can make the light emitted by the light emitting device uniform and have higher illuminance.

It can be understood that those skilled in the art can also make other changes within the spirit of the present invention, which should be included within the scope of the present invention.

Claims (7)

1. a kind of light guide plate, including an incidence surface, it is characterised in that：Micro-structural is provided with the incidence surface, the micro-structural bag Include the raised guide-lighting cylinder of multiple relative incidence surfaces, the plurality of light-guiding pillar body is parallel to each other, the length of each leaded light cylinder with The length of light guide plate is consistent, and the section of each leaded light cylinder is arc-shaped, and radius is 0.04 micron~0.07 micron, the leaded light Cylinder is 0.015 micron~0.06 micron with respect to the height of the incidence surface.

2. light guide plate as claimed in claim 1, it is characterised in that：The plurality of guide-lighting cylinder is close to continuously distributed.

3. light guide plate as claimed in claim 1, it is characterised in that：There is gap between the plurality of guide-lighting cylinder.

4. light guide plate as claimed in claim 1, it is characterised in that：The light guide plate has exiting surface, the exiting surface and should Incidence surface is parallel or the exiting surface is connected with the incidence surface.

5. a kind of light-emitting device, including multiple light sources and multiple light guide plates, it is characterised in that：The size of each light guide plate and corresponding Light source light-emitting area it is equal, the plurality of light guide plate and the plurality of light source are corresponded and each light guide plate is located at corresponding light source Light extraction at, each light guide plate includes being provided with micro-structural on an incidence surface, the incidence surface, and the micro-structural includes multiple phases To the guide-lighting cylinder that the incidence surface is raised, the length of each leaded light cylinder is consistent with the length of light guide plate, the plurality of light-guiding pillar Body is parallel to each other, and the section of each leaded light cylinder is arc-shaped, and radius is 0.04 micron~0.07 micron, the light-guiding pillar body phase pair The height of the incidence surface is 0.015 micron~0.06 micron.

6. light-emitting device as claimed in claim 5, it is characterised in that：The light guide plate has exiting surface, the exiting surface and The incidence surface is parallel or the exiting surface is connected with the incidence surface.

7. light-emitting device as claimed in claim 5, it is characterised in that：The plurality of guide-lighting cylinder is close to continuously distributed or is somebody's turn to do There is gap between multiple guide-lighting cylinders.