CN107436456B - Diffusion device and manufacturing method thereof, light-emitting device, projection system and illumination system - Google Patents
Diffusion device and manufacturing method thereof, light-emitting device, projection system and illumination system Download PDFInfo
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- CN107436456B CN107436456B CN201610362690.4A CN201610362690A CN107436456B CN 107436456 B CN107436456 B CN 107436456B CN 201610362690 A CN201610362690 A CN 201610362690A CN 107436456 B CN107436456 B CN 107436456B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0221—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having an irregular structure
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2053—Intensity control of illuminating light
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Abstract
The embodiment of the invention discloses a scattering device, a manufacturing method thereof, a light-emitting device, a projection system and an illumination system.The scattering device includes: the transparent inorganic substance substrate comprises a first surface and a second surface which are opposite, wherein at least part of the second surface is a rough surface, and the rough surface is provided with a plurality of micro-pits; the transition medium is positioned in the micro recesses of the rough surface and does not exceed the micro recesses in which the transition medium is positioned, the transition medium is in close contact with the inner walls of the micro recesses to form a transition medium-substrate interface, and at least part of the upper surface of the transition medium is a plane; and the refractive index of the transition medium satisfies:
(ii) a Or the like, or, alternatively,
(ii) a The angle of inclination of the micro-pits of the substrate is
The refractive index of the substrate is
The refractive index of the transition medium is
. The embodiment of the invention has the advantage of smaller scattering angle.
Description
Technical Field
The present invention relates to the field of illumination and display technologies, and in particular, to a scattering device, a method for manufacturing the scattering device, a light emitting device, a projection system, and an illumination system.
Background
The use of laser to excite phosphor to generate excited light is a common approach to realize light sources in the prior art. To increase the brightness (energy density), the laser light is focused on the phosphor through a lens. However, since the degree of collimation of the laser beam is very high, a very small spot can be formed after focusing, and the energy density on this spot is large, often exceeding the tolerance range of the phosphor, causing thermal quenching. In order to solve this problem, in the prior art, a scattering sheet is placed on the laser path to reduce the collimation degree thereof, so as to enlarge the light spot focused on the phosphor.
A diffuser commonly used in the prior art is shown in fig. 1. The processing method is to roughen the surface of the glass flat plate so as to cause light scattering. In particular, in order to achieve a better scattering effect during implementation, the processing process may be more complicated. For example, a liquid is used to etch the glass surface to form a rough surface, and then the rough surface is subjected to a polishing process to further control the depth of the undulation. In addition to the liquid etching method, it is also possible to roughen the glass surface by physical methods such as sand blasting to achieve scattering.
It will be appreciated that for each ray, the greater the angle of inclination of the facet on which it is incident, the greater the angle of scattering. Of course, if the tilt angle is 0, i.e., there is no roughness, the light will remain emitted in the original direction. The size distribution of the tilt angles of the facets determines the angular distribution of the scattered beam.
The problem with the prior art is that to achieve a small angular distribution after scattering (i.e. a small scattering) it is difficult to control the tilt angle of the micro-facets to be small, i.e. the glass surface has a rough surface with small undulations. For projection application, the laser spot needs to be controlled to be 1.5-4mm, and the minimum scattering half angle is about 5 degrees, so that the current scattering sheet can meet the requirement. However, for lighting applications, the light spot is often required to be smaller than 1mm, even smaller than 0.5mm, and the scattering half angle is required to be smaller than 3 degrees, even smaller than 1.5 degrees, that is, the scattering sheet is required to diffuse parallel laser light to a small light cone of 1.5 degrees, which has very high control requirements on the surface topography of the scattering sheet, and is difficult to achieve by the current process.
Disclosure of Invention
The invention mainly solves the technical problem of providing a scattering device with a small scattering angle, a manufacturing method thereof, a light-emitting device, a projection system and an illumination system.
An embodiment of the present invention provides a scattering device, including: the transparent inorganic substance substrate comprises a first surface and a second surface which are opposite, wherein at least part of the second surface is a rough surface, and the rough surface is provided with a plurality of micro-pits; the transition medium is positioned in the micro recesses of the rough surface and does not exceed the micro recesses in which the transition medium is positioned, the transition medium is in close contact with the inner walls of the micro recesses to form a transition medium-substrate interface, and at least part of the upper surface of the transition medium is a plane; and the refractive index of the transition medium satisfies:
the angle of inclination of the micro-pits of the substrate is
The refractive index of the substrate is
The refractive index of the transition medium is
。
Preferably, the first and second electrodes are formed of a metal,
，
degree of and
。
preferably, the transparent inorganic substance is glass and the transition medium is an inorganic or organic colloid.
Preferably, the upper surfaces of the transition mediums in all the micro-recesses are planar and are all on the same plane.
The embodiment of the invention also provides a light-emitting device, which comprises a light-emitting source and the scattering device; the light beam emitted by the light source is incident on the scattering device, and the light spot of the light beam incident on the scattering device covers the transition medium.
The embodiment of the invention also provides a projection system which comprises the light-emitting device.
The embodiment of the invention also provides an illumination system which comprises the light-emitting device.
The embodiment of the invention also provides a manufacturing method of the scattering device, which comprises the following steps: providing a transparent inorganic substrate, wherein the substrate comprises a first surface and a second surface which are opposite, at least part of the second surface is a rough surface, and the rough surface is provided with a plurality of micro-pits; coating a liquid transition medium on the rough surface, so that at least part of the transition medium is positioned in the micro-recesses of the rough surface and does not exceed the micro-recesses in which the transition medium is positioned, the transition medium is in close contact with the inner walls of the micro-recesses to form a transition medium-substrate interface, and at least part of the upper surface of the transition medium is a plane; and the refractive index of the transition medium satisfies:
the angle of inclination of the micro-pits of the substrate is
The refractive index of the substrate is
The refractive index of the transition medium is
(ii) a And step three, solidifying the transition medium.
Preferably, the liquid transition medium is applied to the roughened surface by spin coating, pulling or printing.
Preferably, between step two and step three, further comprising: the second surface of the substrate is placed upward and flat to level the liquid transition medium under the action of gravity.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: the scattering angle of the scattering device in the embodiment of the invention is smaller and more controllable.
Drawings
FIG. 1 is a schematic diagram of a prior art diffuser;
FIGS. 2a and 2b are schematic structural views of an embodiment of a scattering device in an embodiment of the present invention;
FIG. 3 is a schematic diagram of another embodiment of a scattering device in accordance with an embodiment of the present invention;
FIG. 4a is a schematic structural diagram of another embodiment of a scattering device in an embodiment of the present invention;
fig. 4b is an enlarged view of the s position in fig. 4 a.
Detailed Description
For reference and clarity, the following description of terms used in the following and the accompanying drawings follows:
the embodiments of the present invention will be described in detail below with reference to the drawings and the embodiments.
Example one
Referring to fig. 2a and 2b, fig. 2a and 2b are schematic structural diagrams of an embodiment of a scattering device according to an embodiment of the present invention. As shown in fig. 2a and 2b, the scattering device 200 includes a transparent inorganic substrate 210 (shaded region) and a transition medium 220 (unshaded region).
The transparent inorganic substrate 210 includes a first surface 211 and a second surface 212 opposite to each other. Transparent in a transparent inorganic substrate means that the substrate material is transparent, low absorbing for the light to be scattered; the inorganic substance is of many choices, such as silica (quartz), alumina, titania, etc., and may also be a mixture of inorganic components, such as glass. The first surface is a plane, and the second surface 212 is a rough surface having a plurality of micro-recesses 213. Generally, whether chemically etched or physically polished, the shape of the microdepressions is irregular and can be viewed as a collection of tiny angled facets of varying angles, simplified to a triangle for illustration. In other embodiments, only a portion of the second surface 212 may be rough.
The transition medium 220 covers the roughened surface of the substrate 210, the transition medium 220 including a third surface 221, the third surface 221 in intimate contact with the roughened surface of the substrate 210 to form a transition medium-substrate interface. In this embodiment, the transition medium 220 further comprises a fourth surface 222 opposite to the third surface, wherein the fourth surface is a plane and parallel to the first surface 211, and the plane is not limited to a smooth plane, but also covers an approximate plane with a slight undulation on the surface.
The light can be incident on the substrate from the rough surface of the substrate or from the first surface of the substrate, so that the light can be diffused by the light diffusion device under the following two conditions:
(1) as shown in FIG. 2a, a light ray L1 is incident on the substrate from the rough surface of the substrate 210, and when there is no transition medium 220 on the substrate 210, the light ray L1 is incident on the air-substrate interface. Assume that the angle of inclination of the micro-pits into which the light ray L1 is incident is
The refractive index of the substrate is
Then the angle of refraction of light ray L1 after refraction at this surface relative to light ray L1 is
The light is refracted again at the first surface of the substrate 210 and emitted as light L2, and the angle of deflection of the light L2 with respect to the light L1 is
. Angle of inclination of micro-pits
The included angle between the inclined surface of the micro-depression and the main surface is the macro surface where the plurality of micro-depressions are located on the rough surface, as shown in a in fig. 2 a. The main surface represents a surface on which the scattering device performs a scattering function, and may be a flat surface or an arc surface (for example, a rough surface processed on an arc surface, and the main surface is an arc surface). When the main surface is an arc surface, the inclination angle of the micro-depression
Refers to the angle of the micro-depression to the tangent plane of the major surface location in which it is located. Since the light ray L1 is generally incident perpendicularly to the main surface, the inclination angle of the micro-pits
Which is equal to the incident angle of the light L1 incident on the inclined surface of the micro-depression. For the most common scattering devices, the main face is substantially parallel to the first surface.
When the transition medium 220 is coated on the substrate 210, the light ray L1 is incident on the transition medium-substrate interface. Assuming a transition medium having a refractive index of
And is and
then ray L1 is refracted to the right at the transition medium-substrate interface, and then deflected at an angle relative to ray L1
The light is refracted again at the first surface of the substrate 210 and emitted as light L3, and the angle of deflection of the light L3 with respect to the light L1 is
. If it is desired to do so
Then, it requires
Suppose that
Then ray L1 is refracted to the left at the transition medium-substrate interface and then deflected at an angle relative to ray L1
The light is refracted again at the first surface of the substrate 210 and emitted as light L4, and the angle of deflection of the light L4 with respect to the light L1 is
. If it is desired to do so
Then, it requires
In the second expression, the light L1 is incident on the substrate from the rough surface of the substrate 210, and the refractive index of the transition medium satisfies
At this time, the light ray L1 is reduced in scattering angle by the scattering device. For example, if
，
，
Then, then
The degree of the magnetic field is measured,
degree; it can be seen that the scattering half-angle of the light ray L1 scattered by the scattering device is reduced by about 80% relative to the prior art. As another example, if
，
，
Then, then
The degree of the magnetic field is measured,
degree; it can be seen that the scattering half-angle of the light ray L1 scattered by the scattering device is reduced by about 80% relative to the prior art.
(2) As shown in FIG. 2b, the light L1 'is incident perpendicularly to the substrate from the first surface of the substrate 210, and the light L1' is incident on the substrate-air interface when the transition medium 220 is not present on the substrate 210. Assume that the angle of inclination of the micro-pits on which the light ray L1' is incident is
The refractive index of the substrate is
Then the angle of refraction of the light ray L1 'after refraction at this surface relative to the light ray L1' is
。
When the transition medium 220 is coated on the substrate 210, the light L1' is incident on the substrate-transition medium interface. Assuming a transition medium having a refractive index of
And is and
then the light ray L1' is refracted to the right at the substrate-transition medium interface, and after refraction, is deflected at an angle relative to the light ray L1
The light is refracted again at the fourth surface of the transition medium 220 and exits as light L3 ', the angle of refraction of the light L3 ' relative to the light L1 ' being
. If it is desired to do so
Then, it requires
Suppose that
Then ray L1' is refracted to the left at the substrate-transition medium interface and then deflected at an angle relative to ray L1
The light is refracted again at the fourth surface of the transition medium 220 and exits as light L4 ', the angle of refraction of the light L4 ' relative to the light L1 ' being
. If it is desired to do so
Then, it requires
In general formula (iv), the light L1' enters the substrate from the first surface of the substrate 210, and the refractive index of the transition medium satisfies
At this time, the light ray L1' is reduced in scattering angle by the scattering device. For example, if
，
，
Then, then
The degree of the magnetic field is measured,
degree; it can be seen that the scattering half-angle of the light ray L1' scattered by the scattering device is reduced by about 81% relative to the prior art. As another example, if
，
，
Then, then
The degree of the magnetic field is measured,
degree; it can be seen that the scattering half-angle of the light ray L1' scattered by the scattering device is reduced by about 83% relative to the prior art.
In summary, the proposed solution of the present embodiment is that the substrate 210 is covered with a transition medium on the rough surface, the transition medium is in close contact with the rough surface, and the refractive index of the transition medium 220 satisfies any one of the following two inequalities, so that the scattering device can reduce the scattering angle of the light to be scattered relative to the prior art:
wherein the inclination of the micro-depressions of the substrateAt an oblique angle of
The refractive index of the substrate is
The refractive index of the transition medium is
。
Through calculation and experimental verification, the refractive index of the substrate is preferably satisfied
The inclination angle of the plurality of micro-recesses on the rough surface of the substrate satisfies
And the refractive index of the transition medium satisfies
. At this time, the verification, the formula (c) and the formula (c) are satisfied simultaneously. It can be seen that, by selecting appropriate transition medium and substrate materials such that the absolute value of the difference between the refractive indices is less than a certain value, a reduction in the scattering angle can be achieved regardless of the direction from which light is incident on the scattering device.
In addition to an effective reduction of the scattering angle, the present embodiment has the advantage that the scattering angle becomes more controllable. This is because the scattering angle is other than the angle with the micro-pits
In addition, the refractive index of the transition medium and the refractive index of the substrate are also related, so the scattering angle of the scattering device can be controlled by selecting the materials of the transition medium and the substrate. In addition, scattering particles can be doped into the transition medium, and the scattering angle of the scattering device can be finely adjusted by controlling the concentration of the scattering particles.
The embodiment has an advantage that after the transition medium is used, the rough surface is located inside the scattering device, and the upper surface of the scattering device, that is, the fourth surface of the transition medium, is a plane, so that an antireflection film can be disposed on the fourth surface to improve the transmittance of the laser. The upper surface of the scattering sheet in the prior art is a rough surface, so that even if an antireflection film is plated, the antireflection effect is greatly reduced.
In particular, the transition medium may be a gel transparent to light to be scattered, which means a substance that is liquid when applied and becomes solid later through a curing process. The transition medium can be inorganic colloid, such as inorganic glue of silicate, and can also be organic colloid, such as transparent silica gel. Inorganic gums have the advantage over organic gums that they are more stable and form a hard film after curing, which does not dust over long term use. And the inorganic colloid is easy to plate an antireflection film due to high hardness after curing. However, since the inorganic colloid and the substrate have different thermal expansion coefficients and are easy to separate or even fall off during the temperature rise/reduction process, the inorganic colloid is preferably made of a material with a thermal expansion coefficient matched with that of the substrate. The organic colloid has low price and easy operation; and the organic colloid has certain elasticity, so even if the thermal expansion coefficient is not matched with the substrate, the self elasticity of the organic colloid can release the stress generated by the mismatching, thereby ensuring that the organic colloid and the substrate cannot be separated. The transition medium can also adopt transparent inorganic materials, such as glass, and the glass can be poured on the rough surface of the substrate by melting; or the transition medium adopts a flat glass, the flat glass is pressed on the rough surface of the substrate by a heating and pressurizing method, the surface of the flat glass is softened and then forms a transition medium-substrate interface with the rough surface of the substrate, and the transition medium-substrate interface is formed into a whole after cooling.
Example two
Referring to fig. 3, fig. 3 is a schematic structural diagram of another embodiment of a scattering device in an embodiment of the present invention. As shown in fig. 3, the scattering device 300 includes a transparent inorganic substrate 310 (shaded region) and a transition medium 320 (unshaded region). The substrate 310 includes a first surface 311 and a second surface 312 opposite to each other, and the second surface 312 is a rough surface. The transition medium 320 covers the rough surface of the substrate 310, and the transition medium 320 includes a third surface 321 and a fourth surface 322 opposite to each other.
The differences between this embodiment and the embodiment shown in fig. 2 include:
the fourth surface 322 of the transition medium is a cambered surface, specifically a convex surface, and the convex surface is equivalent to a lens. The scattering device 300 can be seen as two optical elements divided by a plane B, with a convex lens on the upper surface and a scattering sheet on the lower surface, which can be seen as independent and independent from each other. For example, light emitted from the point light source O passes through the fourth surface 322 and is collimated into parallel light by the convex surface 322, and the parallel light is incident on the rough surface, i.e., the transition medium-substrate interface, and is scattered by the rough surface, and finally exits from the first surface 311 of the substrate as a bundle of nearly parallel scattered light, which can be regarded as a result of two optical elements acting on the light ray independently.
In fact, the micro-pits at different positions on the substrate rough surface 312 have different tilt angles, so that the deflection of the rough surface to the light is random and not controllable for each light, and the rough surface causes each sub-beam to spread into a cone (as a result of the action of the plurality of micro-pits). While the deflection of the light is controllable at different positions of the fourth surface 322, the result of its positioning together with the roughened surface is to superimpose a spot spreading effect on the controllable light field distribution, the magnitude of the spreading being dependent on the roughened surface and independent of the fourth surface. Therefore, the present invention is not limited to the fourth surface, and the fourth surface may be a plane surface, an arc surface, a curved surface, or a surface with a part of a curved surface and a part of an arc surface.
For example, in the present embodiment, the light emitted from the point light source O becomes parallel light through the fourth surface 322, and the parallel light has a scattering effect superimposed after passing through the rough surface 312, i.e. each sub-beam becomes a light cone, the chief rays of the light cones are still parallel (as a result of the action of the fourth surface), and the cone angle of each light cone depends on the plurality of micro-pits (as a result of the action of the rough surface). In the embodiment, the effect of the incident light from the first surface 311 of the parallel light substrate and the emergent light from the rough surface and the fourth surface 322 can still be regarded as the result of the independent action of the two optical elements, i.e. each sub-beam is first diffused into a light cone through the rough surface and then focused into a light spot through the fourth surface.
EXAMPLE III
As can be seen from the analysis of the first embodiment, the transition medium does not necessarily fill the micro-pits, but as long as the micro-pits are filled and the upper surface of the transition medium filling the micro-pits has a portion that is a plane, the light L1 incident on the plane can be reduced by the scattering device. Accordingly, the present invention provides yet another embodiment. Referring to fig. 4a, fig. 4a is a schematic structural diagram of another embodiment of a scattering device in an embodiment of the present invention. As shown in fig. 4a, the scattering device 400 includes a transparent inorganic substrate 410 (shaded region) and a transition medium 420 (unshaded region).
The transparent inorganic substrate 410 includes a first surface 411 and a second surface 412 opposite to each other, and the second surface 412 is a rough surface having a plurality of micro-recesses. The transparent inorganic substrate 410 is described in detail with reference to example one.
The transition medium 420 is located within the plurality of micro-recesses of the roughened surface of the substrate 410 and does not extend beyond the micro-recesses in which it is located, the transition medium 420 being in intimate contact with the interior walls of the micro-recesses to form a transition medium-substrate interface. Referring to fig. 4b, fig. 4b is an enlarged view of the position s in fig. 4 a. At least a portion of the upper surface of the transition medium within the micro-depression is planar (shown as B).
The light can be incident on the substrate from the rough surface of the substrate or from the first surface of the substrate, so that the light can be diffused by the light diffusion device under the following two conditions:
(1) as shown in fig. 4b, light L1 is incident on the substrate from the rough side of the substrate, and when there is no transition medium on the substrate, light L1 is incident on the air-substrate interface. Assume that the angle of inclination of the micro-pits into which the light ray L1 is incident is
The refractive index of the substrate is
Then the angle of refraction of light ray L1 after refraction at this surface relative to light ray L1 is
The light is refracted again at the first surface of the substrate and emitted as light L2, and the angle of deflection of the light L2 relative to the light L1 is
. Angle of inclination of micro-pits
Is the included angle between the inclined plane C of the micro-depression and the plane B. Since the light ray L1 is incident perpendicularly with respect to the plane B, the inclination angle of the micro-pits
Which is equal to the incident angle of the light L1 incident on the inclined surface C of the micro-depression. For the most common scattering devices, the plane B is substantially parallel to the first surface.
When the transition medium is disposed within the micro-depression, light ray L1 is incident at the transition medium-substrate interface through plane B. Assuming a transition medium having a refractive index of
And is and
then ray L1 is refracted to the right at the transition medium-substrate interface, and then deflected at an angle relative to ray L1
The light is refracted again at the first surface of the substrate and emitted as light L3, and the angle of deflection of the light L3 relative to the light L1 is
. If it is desired to do so
Then, it requires
Suppose that
Then ray L1 is refracted to the left at the transition medium-substrate interface and then deflected at an angle relative to ray L1
The light is refracted again at the first surface of the substrate and emitted as light L4 (not shown), and the angle of deflection of the light L4 with respect to the light L1 is
. If it is desired to do so
Then, it requires
In the second expression, the light L1 is incident to the substrate from the rough surface of the substrate, and the refractive index of the transition medium satisfies
At this time, the light ray L1 is reduced in scattering angle by the scattering device 400.
(2) Similarly, light is incident on the substrate from the first surface of the substrate, and the refractive index of the transition medium satisfies
The light is then reduced by the scattering device by the scattering angle.
In summary, when the refractive index of the transition medium 420 satisfies any one of the following two inequalities, the scattering device 400 can reduce the scattering angle of the light to be scattered relative to the prior art:
wherein the micro-depression of the substrate has an inclination angle of
The refractive index of the substrate is
The refractive index of the transition medium is
。
Through calculation and experimental verification, the refractive index of the substrate is preferably satisfied
The inclination angle of the plurality of micro-recesses on the rough surface of the substrate satisfies
And the refractive index of the transition medium satisfies
. At this time, the verification, the formula (c) and the formula (c) are satisfied simultaneously. It can be seen that, by selecting appropriate transition medium and substrate materials such that the absolute value of the difference between their refractive indices is less than a certain value, no matter which direction the light is incident from the scattering deviceThe effect of reducing the scattering angle can be obtained.
In this embodiment, when the transition medium 420 is not disposed, the light ray L1 emitted through the substrate 410 is L2, and after the transition medium is disposed in the micro-recess, the light ray L1 incident on the plane is emitted through the transition medium and the substrate is L3, so that the scattering angle is reduced. In addition, in the embodiment, the transition medium does not exceed the micro-recesses in which the transition medium is located, so that the protrusions between two adjacent micro-recesses play a role in protecting and isolating the transition medium, and the problem that the transition medium is directly contacted with other elements to be damaged is avoided.
Preferably, the upper surfaces of the transition mediums in all the micro-recesses are planar (covering approximately planar), and are all on the same plane, so that the manufacturing is simple. In addition, in the present embodiment, the transition medium is located in the micro-recesses, but in other embodiments, the transition medium may be located only on the protrusions between two adjacent micro-recesses instead.
The embodiment of the invention also provides a light-emitting device, which comprises a light-emitting source and a scattering device, wherein the scattering device can have the structures and the functions in the embodiments. The light-emitting source may comprise a light-emitting diode, a laser diode, or any other element or combination of elements capable of emitting light. The light beam emitted by the light source is incident on the scattering device, and the light spot of the light beam incident on the scattering device covers the transition medium, so that the light beam is scattered by the scattering device and has a smaller scattering angle compared with the prior art. The embodiment of the invention also provides a projection system which comprises the light-emitting device. The projection system may employ various projection technologies, such as Liquid Crystal Display (LCD) projection technology, Digital Light Processor (DLP) projection technology. The embodiment of the invention also provides an illumination system which comprises the light-emitting device. The lighting system may be a flashlight, an automotive light, a stage light, or the like.
Example four
Corresponding to the first and second embodiments, the embodiment of the present invention further provides a method for manufacturing a scattering device, including:
providing a transparent inorganic substrate, wherein the substrate comprises a first surface and a second surface which are opposite, at least part of the second surface is a rough surface, and the rough surface is provided with a plurality of micro-pits;
the method for making the rough surface is various, and an etching method, a sand blasting method, a chemical grinding method and the like are available. The etching method is to etch at least a portion of the surface of the substrate with an etching solution to form a plurality of irregular micro-pits on the surface. The sandblasting method is to blast a surface of a substrate using a sandblasting apparatus to remove some material from the surface irregularities to form a plurality of micro-pits. The chemical polishing method is a method of forming a plurality of irregular micro-pits on a surface of a substrate by mechanically polishing the surface with an abrasive having corrosiveness.
Preferably, the inclination angle of the micro-recesses of the substrate rough surface satisfies
And (4) degree.
Step two, coating a liquid transition medium on the rough surface of the substrate, enabling the transition medium to cover the rough surface, enabling the transition medium to comprise a third surface and a fourth surface which are opposite, enabling the third surface to be in close contact with the rough surface to form a transition medium-substrate interface, and enabling the refractive index of the transition medium to satisfy the following conditions:
wherein the micro-depression of the substrate has an inclination angle of
The refractive index of the substrate is
Refractive transition mediumA rate of
。
The liquid transition medium can be applied to the roughened surface of the substrate using spin coating, pulling or printing. The spin coating method comprises fixing the substrate on a rotary table with the rough surface of the substrate facing upward, dripping liquid transition medium on the rough surface, rotating at high speed, and throwing away excessive transition medium on the substrate by centrifugal force; after the rotation is stopped, the transition medium can be allowed to cover the rough surface of the substrate. The Czochralski method is to vertically immerse the substrate in a liquid transition medium and then vertically pull the substrate up so that the transition medium covers the rough surface of the substrate. The printing method is to print the transition medium on the second surface of the substrate by using a screen printing mode.
Preferably, the refractive index is adopted to satisfy
Having a refractive index of
The transition medium material of (1).
And step three, solidifying the transition medium.
After the application of the liquid transition medium to the rough side of the substrate, the liquid transition medium is cured. The curing of the transition medium may be thermal curing, ultraviolet curing or normal temperature curing, depending on the characteristics of the transition medium.
Preferably, between the second step and the third step, the method further comprises the following steps: and (3) the second surface of the substrate is upwards and horizontally placed, so that the liquid transition medium is leveled under the action of gravity, and the fourth surface of the transition medium is a plane.
EXAMPLE five
Corresponding to the third embodiment, the embodiment of the present invention further provides a method for manufacturing a scattering device, where the method includes:
providing a transparent inorganic substrate, wherein the substrate comprises a first surface and a second surface which are opposite, at least part of the second surface is a rough surface, and the rough surface is provided with a plurality of micro-pits;
the method for making the rough surface is various, and an etching method, a sand blasting method, a chemical grinding method and the like are available. The etching method is to etch at least a portion of the surface of the substrate with an etching solution to form a plurality of irregular micro-pits on the surface. The sandblasting method is to blast a surface of a substrate using a sandblasting apparatus to remove some material from the surface irregularities to form a plurality of micro-pits. The chemical polishing method is a method of forming a plurality of irregular micro-pits on a surface of a substrate by mechanically polishing the surface with an abrasive having corrosiveness.
Preferably, the inclination angle of the micro-recesses of the substrate rough surface satisfies
And (4) degree.
Coating a liquid transition medium on the rough surface of the substrate, so that at least part of the transition medium is positioned in the micro-recesses of the rough surface and does not exceed the micro-recesses in which the transition medium is positioned, the transition medium is in close contact with the inner walls of the micro-recesses to form a transition medium-substrate interface, and at least part of the upper surface of the transition medium is a plane; and the refractive index of the transition medium satisfies:
wherein the micro-depression of the substrate has an inclination angle of
The refractive index of the substrate is
The refractive index of the transition medium is
。
The liquid transition medium can be applied to the roughened surface of the substrate using spin coating, pulling or printing. For example, spin coating is a method in which a substrate is fixed on a spin stand with its rough surface facing upward, a liquid transition medium is dropped onto the rough surface, and then the substrate is rotated at high speed, and excess transition medium is thrown off by centrifugal force. The faster the rotation speed, the less transition medium remains on the rough surface, and the height of the transition medium in the micro-recess can be lower than a certain value after the rotation is stopped as long as the rotation speed is higher than a certain rotation speed.
Preferably, the refractive index is adopted to satisfy
Having a refractive index of
The transition medium material of (1).
And step three, solidifying the transition medium.
After the application of the liquid transition medium to the rough side of the substrate, the liquid transition medium is cured. The curing of the transition medium may be thermal curing, ultraviolet curing or normal temperature curing, depending on the characteristics of the transition medium.
Preferably, between the second step and the third step, the method further comprises the following steps: and (3) the second surface of the substrate is upwards and horizontally arranged, so that the liquid transition medium is leveled under the action of gravity, and the upper surfaces of the transition media in all the micro-pits are all planes and are on the same plane.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A scattering device, comprising:
the transparent inorganic substance substrate comprises a first surface and a second surface which are opposite, at least part of the second surface is a rough surface, the rough surface is provided with a plurality of micro-depressions, the inclination angles of the micro-depressions are included angles between inclined planes of the micro-depressions and a main surface, and the main surface is a macro surface where the plurality of micro-depressions are jointly located on the rough surface;
a transition medium disposed in the plurality of micro-recesses of the rough surface and not beyond the micro-recesses in which the transition medium is disposed, the transition medium being in intimate contact with the inner walls of the micro-recesses to form a transition medium-substrate interface, at least a portion of the upper surface of the transition medium being planar; and the refractive index of the transition medium satisfies:
the inclination angle of the micro-recess of the substrate is theta, and the refractive index of the substrate is n1The refractive index of the transition medium is n2。
2. The scattering device of claim 1, wherein: 1 < n12, theta < 20 degrees, and | n1-n2|＜(n1-1)-90％。
3. A scattering device as claimed in claim 1 or 2, characterized in that: the transparent inorganic substance is glass, and the transition medium is inorganic colloid or organic colloid.
4. A scattering device as claimed in claim l or 2, wherein the upper surfaces of the transition media in all the micro-depressions are planar and are all in the same plane.
5. A light-emitting device comprising a light-emitting source and a scattering device as claimed in any one of claims 1 to 4; and light beams emitted by the light emitting sources are incident on the scattering device, and light spots of the light beams incident on the scattering device cover the transition medium.
6. A projection system comprising the light-emitting device according to claim 5.
7. An illumination system comprising the light-emitting device according to claim 5.
8. A method of manufacturing a scattering device, comprising:
providing a transparent inorganic substrate, wherein the substrate comprises a first surface and a second surface which are opposite, at least part of the second surface is a rough surface, the rough surface is provided with a plurality of micro-depressions, the inclination angles of the micro-depressions are included angles between inclined surfaces of the micro-depressions and a main surface, and the main surface is a macroscopic surface where the plurality of micro-depressions are located on the rough surface;
coating a liquid transition medium on the rough surface, so that at least part of the transition medium is positioned in the micro-recesses of the rough surface and does not exceed the micro-recesses in which the transition medium is positioned, the transition medium is in close contact with the inner walls of the micro-recesses to form a transition medium-substrate interface, and at least part of the upper surface of the transition medium is a plane; and the refractive index of the transition medium satisfies:
the inclination angle of the micro-recess of the substrate is theta, and the refractive index of the substrate is n1The refractive index of the transition medium is n2；
And step three, solidifying the transition medium.
9. The manufacturing method according to claim 8, characterized in that: and coating a liquid transition medium on the rough surface by adopting a spin coating method, a pulling method or a printing method.
10. The manufacturing method according to claim 8 or 9, characterized in that: the method also comprises the following steps between the second step and the third step: and the second surface of the substrate is upwards and horizontally placed, so that the liquid transition medium is leveled under the action of gravity.
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