CN107561834B - Light-emitting device, related projection system and lighting system - Google Patents
Light-emitting device, related projection system and lighting system Download PDFInfo
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- CN107561834B CN107561834B CN201610496703.7A CN201610496703A CN107561834B CN 107561834 B CN107561834 B CN 107561834B CN 201610496703 A CN201610496703 A CN 201610496703A CN 107561834 B CN107561834 B CN 107561834B
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Abstract
The embodiment of the invention discloses a light-emitting device, a related projection system and an illumination system, wherein the light-emitting device comprises: a light source; the surface scattering sheet is used for scattering the incident light rays from the light source, and the incident light rays are obliquely incident on the scattering sheet, so that the light rays form a polar-shaped scattering light spot after passing through the scattering sheet; the normal line of the scattering surface of the surface scattering sheet is in a plane determined by the incident light and the preset direction; and a wavelength conversion device, wherein the light scattered by the surface scattering sheet is incident on the wavelength conversion device. The polarity shape in the embodiment of the invention can more fully utilize the rectangular entrance area of the integrating rod, namely the fluorescent light spot incident on the integrating rod can be larger, so that the excitation light spot incident on the fluorescent powder is also larger, thereby reducing the excitation light energy density and reducing the thermal quenching phenomenon.
Description
Technical Field
The present invention relates to the field of display and illumination technologies, and in particular, to a light emitting device, a projection system and an illumination system.
Background
The use of laser as excitation light to excite fluorescent powder to generate fluorescence is a main development direction of novel special light sources, and has been applied to the fields of projection display, engineering special illumination and the like.
Because the collimation of the laser is extremely strong, if the collimated laser is directly focused, the obtained focal diameter is extremely small, and then the thermal quenching phenomenon is easy to occur when the fluorescent powder is excited. As shown in fig. 1a, in order to avoid thermal quenching, a solution that is widely adopted at present is to use a surface scattering sheet 12 on the optical path of the laser emitted from a laser source 11 and incident on the fluorescent powder to scatter the collimated laser L into a light cone with a certain cone angle, and the light cone is focused by a focusing lens (not shown) to obtain a circular light spot Y on a target plane a, which is larger than the original focal point, so that the energy density of the laser at the focal point is greatly reduced, and the energy density of the laser at the fluorescent powder is reduced.
The scattering sheet scatters to obtain a circular light spot, so that the light spot emitted by the fluorescent powder is also a circular light spot. Circular spots are widely used in many applications, but are not optimized for use in projection displays. This is because the screen of the projection display is rectangular. To obtain a rectangular uniform spot, an integrator rod is typically used in projection systems to shape the incident circular fluorescent spot, which requires that the circular spot incident on the integrator rod is inscribed at least in the rectangular entrance of the integrator rod (as shown in fig. 1 b). Although light can be entirely entered and utilized with high efficiency, the circular spot is designed to be small (the diameter is smaller than or equal to the length of the short side of the integrator rod entrance), and thus most of the area of the integrator rod entrance cannot be fully utilized. Because the round fluorescent light spot is designed to be smaller, the round laser light spot of the incident fluorescent powder is also designed to be smaller, so that the excitation light energy density of the incident fluorescent powder is higher, and thermal quenching is easy to occur.
Disclosure of Invention
The invention mainly solves the technical problem of providing a light-emitting device, a related projection system and a related illumination system to solve the problem that thermal quenching is easy to occur due to higher energy density of excitation light.
An embodiment of the present invention provides a light emitting device including: a light source; the surface scattering sheet is used for scattering the incident light rays from the light source, and the incident light rays are obliquely incident on the scattering sheet, so that the light rays form a polar-shaped scattering light spot after passing through the scattering sheet; the normal line of the scattering surface of the surface scattering sheet is in a plane determined by the incident light and the preset direction; and a wavelength conversion device, wherein the light scattered by the surface scattering sheet is incident on the wavelength conversion device.
Optionally, the light emitting device further includes a driving device for driving the wavelength conversion device to periodically move, and the included angle between the direction projected to the moving surface of the wavelength conversion device and the moving direction of the wavelength conversion device when the predetermined direction propagates to the wavelength conversion device along the optical path is greater than 60 degrees and not more than 90 degrees.
Optionally, the direction projected onto the moving surface of the wavelength conversion device when the predetermined direction propagates along the optical path to the wavelength conversion device is perpendicular to the moving direction of the wavelength conversion device.
Optionally, the light emitting device further includes an integrating rod located at a rear end of the optical path of the wavelength conversion device, and an included angle between a direction projected to an entrance plane of the integrating rod when the predetermined direction propagates to the integrating rod along the optical path and a long side direction of the entrance is not more than 30 degrees.
Optionally, the direction projected onto the integrator rod entrance plane when the predetermined direction propagates along the optical path to the integrator rod is parallel to the long side direction of the integrator rod.
Optionally, the light emitting device further includes a regulator for regulating an incident angle of the incident light ray to the diffusion sheet.
Optionally, the regulator comprises: a reflecting mirror for reflecting incident light rays from the light source to the surface scattering sheet; and the driving device is used for driving the reflecting mirror to rotate so as to change the incident angle of the incident light ray entering the reflecting mirror.
Optionally, the lighting device further comprises a controller for controlling the regulator according to a predetermined requirement.
The embodiment of the invention also provides a projection system which comprises any one of the light-emitting devices.
The embodiment of the invention also provides a lighting system which comprises any one of the light emitting devices.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
compared with the circular light spots in the prior art, the polar shape (such as an elliptical light spot) in the embodiment of the invention can more fully utilize the rectangular entrance area of the integrating rod, namely the fluorescent light spot incident on the integrating rod can be larger, so that the excitation light spot incident on the fluorescent powder is also larger, thereby reducing the excitation light energy density and the thermal quenching phenomenon. In addition, the embodiment of the invention can adjust the maximum polarity direction of the scattered light spot to a preset direction by adjusting the surface scattering sheet and the incident light, so that the light spot can be matched with the light path rear-end element.
Drawings
FIG. 1a is a schematic diagram of a light spot on a plane A of a light emitting device according to the prior art;
FIG. 1b is a schematic view of a rectangular entrance to an integrator rod inscribed in a circular spot;
FIG. 2 is a schematic view of the structure of a light emitting device in the experiment of the present invention and a schematic view of light spots on a plane A;
FIG. 3 is a schematic view of the structure of the surface scattering sheet in FIG. 2;
FIG. 4a is a schematic view showing a region of a micro-recess of a surface diffuser rotating counterclockwise when light enters a rough surface from the plane of the surface diffuser;
FIG. 4b is a schematic view of the right side of the micro-recess of FIG. 4a rotated counterclockwise;
FIG. 4c is a schematic view of the left side of the micro-recess of FIG. 4a rotated counterclockwise;
FIG. 4d is a graph showing the results of numerical analysis of the deflection angles in FIG. 4b and FIG. 4 c;
FIG. 4e shows the variation of the scattered light spot caused by the rotation of the surface scattering sheet when light enters the rough surface from the plane of the surface scattering sheet;
FIG. 5a is a schematic view showing a light beam entering a rough surface of a surface diffuser, and the micro-recess of the surface diffuser is rotated counterclockwise;
FIG. 5b is a schematic view of the left side of the micro-recess of FIG. 5a rotated counterclockwise;
FIG. 5c is an equivalent view of the rotation of FIG. 5 b;
FIG. 5d is a schematic view of the right side of the micro-recess of FIG. 5a rotated counterclockwise;
FIG. 5e is a schematic view of the micro-pits rotating counterclockwise when light is incident on the roughened surface from a plane;
FIG. 6 is a schematic illustration of incident light, a surface diffuser and a predetermined direction relationship;
FIG. 7 is a schematic view of a structure of an embodiment of a light emitting device in an embodiment of the present invention;
FIG. 8a is a schematic view of another embodiment of a light emitting device according to an embodiment of the present invention;
FIG. 8b is a schematic view of the integrator rod inlet from the x-direction of the embodiment of FIG. 8 a;
fig. 9a is a schematic structural view of another embodiment of a light emitting device according to an embodiment of the present invention;
FIG. 9b is a schematic diagram of the wavelength conversion device of the embodiment of FIG. 9a, as seen in the x-direction;
fig. 10 is a schematic structural view of another embodiment of a light emitting device according to an embodiment of the present invention.
Detailed Description
For purposes of reference and clarity, the following description of terms used in the drawings and figures is as follows:
wavelength conversion material: the wavelength conversion material may be a phosphorescent material, such as a phosphor, or a nanomaterial, such as quantum dots, or a fluorescent material.
Excitation light: the wavelength converting material can be excited such that the wavelength converting material produces light of different wavelengths of light.
Is subjected to laser: the wavelength converting material is stimulated to produce light.
Excitation light, wavelength converting material, laser are relative concepts. For example, blue light excites a yellow phosphor to produce yellow light, which is the excitation light and the yellow light is the lasing light. And the yellow light excites the red fluorescent powder to generate red light, and at the moment, the yellow light is excitation light, and the red light is subjected to laser.
In the prior art, it is generally considered by those skilled in the art that only a circular light spot can be obtained by scattering laser light by a scattering sheet, and therefore, the circular light spot has to be shaped into a rectangular light spot by using a shaping element such as an integrating rod. However, the inventors have found this phenomenon by accident in experiments: as shown in fig. 2, when the surface scattering sheet 12 is rotated in the paper surface, for example, from a direction perpendicular to the incident laser beam L to a direction inclined with respect to the incident laser beam L, the deflection angle of the spot T1 scattered by the surface scattering sheet 12 in the up-down direction of the target plane a (i.e., the plane perpendicular to the paper surface) is enlarged, and the entire surface is nearly elliptical. Similarly, if the rotation direction of the surface scattering sheet is in the plane perpendicular to the y direction, the deflection angle of the spot T2 scattered by the surface scattering sheet 12 in the right-left direction of the target plane a is enlarged after the surface scattering sheet is rotated from the direction perpendicular to the incident laser beam L to the direction inclined with respect to the incident laser beam L, and the entire surface scattering sheet is nearly elliptical.
In this regard, the inventors have conducted the following principle analysis:
as shown in fig. 3, the surface scattering sheet 12 includes a flat surface 31 and a rough surface 32, and the rough surface 32 is a surface having different refractive indexes on both sides formed by a plurality of micro-recesses. The medium with different refractive indexes at two sides is most commonly glass and air, but not limited to the glass and the air. The portion below the roughened surface (hereinafter simply referred to as a substrate for convenience of description) may be a transparent inorganic substance, and glass is just one example. Transparent means that the material is transparent to incident light, low absorption; the inorganic substances are selected from various kinds, such as silica (quartz), alumina, titania, etc., and may be a mixture of various inorganic substances. The medium above the roughened surface may be not only air but also another medium having a refractive index different from that of the substrate. Specifically, the medium above the rough surface may be a colloid transparent to the incident light, which is a liquid when coated and becomes solid after the curing process. The colloid may be inorganic colloid such as silicate inorganic glue, or organic colloid such as transparent silica gel.
The macroscopic surface B on which the plurality of micro-pits are located together on the roughened surface is called a scattering surface. The surface scattering sheet deflects light rays by using a plurality of irregular micro-pits in the rough surface, thereby realizing the purpose of scattering. In fig. 2, assuming that the rotation direction of the surface scattering sheet is counterclockwise of the paper surface, and the rotation makes the laser light no longer perpendicularly incident on the scattering surface, the deflection of the light by the scattering sheet is no longer uniform, but the deflection angle in the direction parallel to the rotation plane (i.e., paper surface) on the target plane aIncreasing the deflection angle in the direction perpendicular to the plane of rotation>Unchanged, so that an approximately elliptic light spot is formed on the target plane A; the rotation plane is the plane formed by the normal line of the scattering plane B and the incident light, and the deflection angle +.>Refers to the angle of the light which changes in the back direction of the surface scattering sheet, namely the included angle between the emergent light and the incident light of the surface scattering sheet.
The deflection angle of the light ray in the direction parallel to the rotation plane is analyzed as followsIs a variation of (2).
First, consider the case where light is incident on a rough surface from the plane of the surface scattering sheet. Referring to fig. 4a and fig. 4b, fig. 4a is a schematic diagram illustrating a counterclockwise rotation of an area of a micro-recess of a surface scattering sheet when light enters a rough surface from a plane of the surface scattering sheet; FIG. 4b is a schematic view of the micro-concave right-hand side of FIG. 4a rotated counterclockwise. As shown in fig. 4b, for each rayThe refraction of the plane and the rough surface is needed to be sequentially carried out, and the deflection angle of the light rays is the angle of the change of the direction after passing through the plane and the rough surface. Assuming that the refractive index of the surface scattering sheet is n, the included angle between the plane and the rough surface (i.e. the inclination angle of the micro-concave) isThe incidence angle of the laser light incident on the plane is +.>Then the incident light is deflected by two faces by a deflection angle +.>The method meets the following conditions:
…………①
analysis of the difficult-to-resolve inflection angle from equation (1)Incident angle->Is a variation of (c). But can see the limit case, i.e. when +.>Less time (+)>Approach 0),%>Deflection angle of visible light after passing through two faces +.>With incident angleIrrelevant, at this time +.>To determine the value. This also illustrates the angle of deflection and the angle of incidence of the surface scattering sheet +.>Is insensitive to a certain extent, i.e. when +.>At a relatively small time, the rotation of the diffuser does not change the deflection angle significantly (this can be verified in the numerical calculations below).
When (when)When the smaller condition is not satisfied, < - > a +.>Along with->The variation of (c) can be obtained by numerical calculation. As shown in FIG. 4d, the abscissa is the incident angle of light incident on a plane +.>The ordinate is the angle of deflection of the light after passing through the plane and rough surface>The dotted curve is the numerical calculation result of formula (1), the condition of the numerical analysis is +.>，/>The dotted curve completely matches the experimental dataThe angle of deviation->Incident angle->The variation of (2) is monotonically increasing, except for the offset angle +>At incident angle->Smaller times (e.g.)><15 degrees) the increase is not significant. It can be seen that, in fig. 4b, after the surface scattering sheet rotates counterclockwise, the angle of incidence of the incident light on the scattering sheet increases, which causes the deflection angle of the light in the direction parallel to the rotation plane to increase, so that the scattering light spot is elliptical, but the phenomenon is very insignificant when the rotation angle is small, and the scattering light spot still looks like a circular light spot, which may be the main reason why the phenomenon has not been found.
The right side of the micro-pits in fig. 4a was analyzed above, and the left side of the micro-pits was analyzed below. Referring to fig. 4c, fig. 4c is a schematic diagram illustrating the left area of the micro-recess in fig. 4a rotated counterclockwise. Analyzed, in FIG. 4c, the deflection angleThe formula (1) is also satisfied, which is equivalent to +.>Rotate in the opposite direction, i.e.)>And becomes larger in the negative direction. The same conditions were used to conduct numerical analysis, and the solid curve in FIG. 4d is commonThe numerical value of the formula (1) is calculated. It can be seen that in FIG. 4c, when the surface scattering sheet rotates counterclockwise, the incident angle of the incident light to the scattering sheet increases, which causes an increase in the deflection angle, except that the phenomenon is at the incident angle +.>And less so. Further, as can be seen from a comparison of the solid curve and the dotted curve in fig. 4c, the deviation angle difference between the solid curve and the dotted curve is within 1.5 degrees in a certain range of the incident angle, for example, when the incident angle is smaller than 60 degrees. Therefore, the light rays are incident on the rough surface from the plane of the surface scattering sheet, and when the surface scattering sheet rotates anticlockwise, the deflection angle caused by the left side and the right side of the micro-concave is +.>Also increases and the magnitude of the left and right increases is close within a certain angle of rotation, which results in the deflection angle extending to both sides in a direction parallel to the plane of rotation and the extension of both sides being substantially symmetrical.
The above describes the case where light is incident on the rough surface from the plane of the surface diffusion sheet, and the surface diffusion sheet rotates counterclockwise. It will be appreciated that due to the symmetrical relationship, light is incident on the roughened surface from the plane of the surface diffuser and that a clockwise rotation of the surface diffuser also has the same effect. Referring to fig. 4e, fig. 4e shows a change of a scattered light spot caused by rotation of the surface scattering sheet when light enters the rough surface from the plane of the surface scattering sheet. As shown in fig. 4e, in the initial state, the light is perpendicularly incident to the plane of the surface scattering sheet, and the scattering spot 1 of the surface scattering sheet is circular; and after the surface scattering sheets rotate anticlockwise and clockwise respectively, the scattering spots 2 and 3 of the surface scattering sheets are elliptical.
The case where the laser light is incident on the rough surface from the plane was analyzed as above, and the case where the laser light is incident on the plane from the rough surface was analyzed as below.
Referring to fig. 5a, fig. 5a shows a region of a micro-recess of a surface scattering sheet rotating counterclockwise when light is incident from a rough surface of the surface scattering sheetSchematic diagram. Turning to the left of the micro-recess in fig. 5a is first seen. Referring to fig. 5b and 5c, fig. 5b is a schematic view of the left side of the micro-recess in fig. 5a rotated counterclockwise; fig. 5c is an equivalent view of the rotation in fig. 5 b. As shown in fig. 5b, for each light ray, the refraction of the rough surface and the plane is sequentially performed, and the deflection angle of the light ray is the angle of the rough surface and the plane which changes in the rear direction. The micro-pits in fig. 5b rotate from state 1 to state 2, which is equivalent to the micro-pits in fig. 5c rotate from state 1 to state 3 to state 2, i.e. the rough surface is flattened (state 3) first and then the rotation is continued (state 2). The rotation angle of the micro-pits from state 1 to state 3 is equal to the inclination of the micro-pits themselves, which is small, typically only a few degrees. From state 3 to state 1, corresponding to the clockwise rotation of the micro-pits when light is incident on the roughened surface from the plane, it is clear from the above analysis that the small angle rotation causes the light deflection angleThe variation of (2) is small and negligible, so the deflection angle caused by the rotation of the micro-pits from state 1 to state 3 is +.>The variation in (c) is small and negligible. Thus, the rotation of the micro-recesses from state 1 to state 2 in fig. 5b may be equivalent to the rotation of the micro-recesses from state 3 to state 2 in fig. 5 c. The rotation of the micro-pits from state 3 to state 2 corresponds to the case of the micro-pits rotating counterclockwise when the light is incident on the rough surface from the plane, and thus, the case of the micro-pits rotating counterclockwise when the light is incident on the plane from the rough surface shown in fig. 5b is equivalent to the case of the micro-pits rotating counterclockwise when the light is incident on the rough surface from the plane (as shown in fig. 4 d).
Turning to the right of the micro-recess in fig. 5a is next seen. Referring to fig. 5d and 5e, fig. 5d is a schematic view of the right side of the micro-recess in fig. 5a rotated counterclockwise; FIG. 5e is a schematic view of the micro-pits rotating counterclockwise when light is incident on the roughened surface from a plane. The micro-recesses in FIG. 5d are rotated from state 1 toState 2, equivalent to the micro-pits rotating from state 1 to state 2 in fig. 5 e. Whereas in fig. 5e the rotation angle of the micro-pits from state 3 to state 1 is equal to the inclination of the micro-pits themselves, this angle is small, typically only a few degrees. From the above analysis, it can be seen that the small angle of rotation causes a ray deflection angleThe change in (2) is small and negligible, so the micro-pits in FIG. 5e are rotated from state 3 to state 1 to cause a deflection angle +.>The variation in (c) is small and negligible. Thus, the rotation of the micro-recesses from state 1 to state 2 in fig. 5d may be equivalent to the sum of the rotation of the micro-recesses from state 3 to state 1 and from state 1 to state 2 in fig. 5e, i.e. to the rotation from state 3 to state 2. Therefore, the case where the light rays shown in fig. 5d are rotated counterclockwise from the right of the micro-concave when the light rays are incident on the plane of the rough surface is equivalent to the case where the light rays are rotated counterclockwise from the plane of the rough surface.
In summary, the case of counterclockwise rotation of the micro-recesses left and right when the plane is incident from the rough surface is equivalent to the case of counterclockwise rotation of the micro-recesses when the light is incident from the plane to the rough surface. Therefore, when the light rays are incident from the rough surface of the surface scattering sheet and the surface scattering sheet rotates anticlockwise, the deflection angle caused by the left side and the right side of the micro-concave is increased along with the increase of the incident angleAlso increases and the magnitude of the left and right increases is close within a certain angle of rotation, which results in the deflection angle extending to both sides in a direction parallel to the plane of rotation and the extension of both sides being substantially symmetrical. In the same way, the light is incident from the rough surface of the surface diffuser and has the same effect when the surface diffuser is rotated clockwise, and will not be described in detail here.
In summary, no matter the light is incident on the rough surface from the plane or the rough surface, or the surface scattering sheet is rotated anticlockwise or clockwise, the deflection angle of the surface scattering sheet extends towards both sides simultaneously in the direction parallel to the rotation plane, and the extension remains basically symmetrical, which is consistent with the phenomenon observed in experiments. In the direction perpendicular to the rotation plane, the deflection angle of the surface scattering sheet is unchanged, so that the surface scattering sheet forms approximately elliptical scattering spots in the rotation process. The length of such a near-elliptical spot in the P direction is longer than in the Q direction perpendicular to the P direction, which the inventors refer to as a polarized shaped spot, is referred to as a polar direction. If there are a plurality of polarity directions, the polarity direction having the largest length is defined as the maximum polarity direction. For example, the elliptical spot, the major axis and the direction with smaller angle to the major axis are all polar directions, and the major axis direction is the direction of maximum polarity.
Further, the present inventors have found through experiments and analyses that: as shown in fig. 6, the incident light L1 is obliquely incident on the surface scattering sheet, and the normal L2 of the scattering surface of the surface scattering sheet and the incident light L1 form a normal plane C, and the direction of an intersection line L3 of the normal plane C and a plane D (hereinafter simply referred to as a target plane) perpendicular to the optical axis of the scattered light is the maximum polarity direction of the polarized scattered light spot T2. The rotation of the surface scattering sheet shown in fig. 2 is a special case, the normal plane formed by the incident light and the normal line is the paper surface, the intersection line of the normal plane and the target plane a is the vertical line in the paper surface, and the direction of the vertical line is the direction of the maximum polarity of the scattering light spot T1.
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and the embodiments.
Example 1
Based on the experimental findings and principle analysis, the invention provides a light-emitting device. Referring to fig. 7, fig. 7 is a schematic structural diagram of an embodiment of a light emitting device according to the present invention. As shown in fig. 7, the light emitting device 700 includes a light source 710 and a surface scattering sheet 720.
The light source 710 is preferably a laser, but may be other light emitting elements or components as long as it provides an incident light ray L1 having a small divergence angle.
The structure of the surface scattering sheet 720 is described with reference to fig. 3. The light L1 from the light source 710 is incident on the surface diffusion sheet 720, and the light L1 may be incident on the plane of the surface diffusion sheet 720 or on the rough surface of the surface diffusion sheet 720. The surface scattering sheet 720 is used for scattering the incident light L1, and the incident light L1 is obliquely incident on the scattering sheet, so that a polar-shaped scattering spot T2, such as an elliptical spot, is formed after the light passes through the scattering sheet.
Compared with the circular light spot in the prior art, the polar shape (such as an elliptical light spot) in the embodiment can more fully utilize the rectangular entrance area of the integrating rod, namely the fluorescent light spot incident on the integrating rod can be larger, so that the excitation light spot incident on the fluorescent powder is also larger, thereby reducing the excitation light energy density and reducing the thermal quenching phenomenon. In addition, the polar-shaped scattering light spot in the present embodiment can also be applied to the field of vehicle lamps. The light distribution of the lamp is required to be small in the up-down direction and much larger in the left-right direction, for example, 5 degrees in the left-right direction and about 1 degree in the up-down direction. In the prior art, round or square light spots of a plurality of light sources are transversely spliced into strip-shaped light spots to realize vehicle light distribution, and the problem is that the light spots are transversely uniform and cannot be effectively concentrated in the center. By using the scheme of the embodiment, not only the light distribution of the car light can be realized, but also the effect that the brightness center is strongest and gradually decreases towards the two sides can be realized, so that the car light can be irradiated farther.
The above analysis mentions that when the incident angle of the incident light is small, the deflection angle of the light in the direction parallel to the rotation plane of the diffusion sheetThe increase is so small that the polar shape of the scattered light spot is not yet apparent and still looks like a circular spot. Therefore, it is preferable that the incident angle of the incident light L1 on the surface scattering sheet 720 is 20 degrees or more, so that the polarity shape of the scattering light spot is obvious. More preferablyIn this case, the incident angle of the incident light L1 on the surface scattering sheet 720 is greater than or equal to 30 degrees, and the aspect ratio of the polar shape of the scattering light spot is more suitable for the projection requirement. As can be seen from fig. 4d, the larger the incident angle is, the larger the deflection angle is, so the larger the aspect ratio of the polar shape of the scattered light spot, for example, the larger the major axis short axis ratio of the elliptical light spot is, and therefore the incident angle is preferably 60 degrees or less, at this time, the polarity of the light spot is not too large, that is, the aspect ratio of the light spot is not too large, and the incident light beam can avoid total reflection as much as possible when passing through the surface scattering sheet, and the transmittance is relatively high.
Since the incident light L1 and the normal L2 of the scattering surface of the surface scattering sheet form a normal plane C, the direction of the intersection line L3 of the normal plane C and the direction perpendicular to the target plane D is the direction of the maximum polarity of the scattering spot T2 having a polar shape. Therefore, in order to make the maximum polar direction of the scattered light spot be a predetermined direction (for example, the L3 direction), the present embodiment further sets the surface scattering sheet 720 such that the scattering surface normal L2 thereof is in the plane defined by the incident light ray L1 and the predetermined direction L3. As shown, the plane D 'is parallel to the target plane D, the line L3' in the plane D 'is parallel to the line L3 in the target plane D, and the normal L2 of the scattering surface of the surface scattering sheet is in the plane C formed by intersecting the incident light ray L1 with the line L3', that is, in the plane C formed by intersecting the incident light ray L1 with the line L3.
Therefore, with the present embodiment, not only a scattering light spot having a polar shape can be obtained, but also the maximum polar direction of the light spot can be adjusted to a desired predetermined direction by adjusting the surface scattering sheet and the incident light, so that the light spot can be matched with the light path rear-end element, for example, the maximum polar direction of the light spot can be adjusted to a direction parallel to the long side of the entrance of the integrator rod.
Example two
Referring to fig. 8a and 8b, fig. 8a is a schematic structural diagram of another embodiment of a light emitting device according to an embodiment of the present invention, and fig. 8b is a schematic diagram of an integrator rod inlet viewed in an x direction in the embodiment of fig. 8 a. As shown in fig. 8a and 8b, the light-emitting device 800 includes a light source 810 and a surface scattering sheet 820, and an incident light L1 emitted from the light source 810 is obliquely incident on the surface scattering sheet 820. The light emitting device further comprises an integrating rod 830 positioned at the rear end of the light path of the surface scattering sheet 820, wherein the optical axis of the light emitted by the surface scattering sheet 820 is the horizontal direction of the paper surface, the entrance plane of the integrating rod is perpendicular to the optical axis, the long side direction of the entrance 831 of the integrating rod is parallel to the vertical direction of the paper surface, and the short side direction of the entrance 831 is perpendicular to the paper surface.
In this embodiment, the predetermined direction is set to the vertical direction of the paper surface, parallel to the long-side direction of the entrance of the integrating rod. The plane determined by the predetermined direction and the incident light ray L1 is a paper surface, and the normal L2 of the scattering surface of the plane scattering sheet 820 is set in the paper surface, so that the maximum polarity direction, namely the long axis direction, of the elliptical light spot T2 emitted to the entrance plane of the integrating rod by the plane scattering sheet 820 is a predetermined direction, namely the vertical direction of the paper surface. Therefore, in this embodiment, by setting the predetermined direction to be parallel to the long-side direction of the entrance of the integrator rod, so that the long axis of the elliptical spot of the entrance plane of the integrator rod is parallel to the long-side direction of the entrance of the integrator rod, the matching degree of the spot with the entrance is improved. Of course, the elliptical spot may be further made to closely inscribe the entrance of the integrator rod, so that the spot matches the entrance optimally.
In other embodiments, the optical axis of the light emitted from the surface scattering plate 820 may be obliquely incident on the entrance plane of the integrator rod, and the light emitted from the surface scattering plate 820 may be incident on the integrator rod through an optical element such as a mirror instead of directly incident on the integrator rod, where the direction projected onto the entrance plane of the integrator rod is required to be parallel to the long-side direction of the entrance when the light propagates to the integrator rod along the optical path, so that the long axis of the elliptical light spot is parallel to the long-side direction of the entrance of the integrator rod. In the case where the matching degree between the optical spot and the entrance of the integrator rod is not so high, the predetermined direction is set so that the angle between the direction projected to the entrance plane of the integrator rod and the long-side direction of the entrance does not exceed 30 degrees when propagating to the integrator rod along the optical path.
Example III
Referring to fig. 9a and 9b, fig. 9a is a schematic structural diagram of another embodiment of a light emitting device according to an embodiment of the present invention, and fig. 9b is a schematic diagram of a wavelength conversion device according to an x-direction in the embodiment of fig. 9 a. As shown in fig. 9a and 9b, the light-emitting device 900 includes a light source 910 and a surface scattering sheet 920, and an incident light L1 emitted from the light source 910 is obliquely incident on the surface scattering sheet 920. The light emitting device further includes a wavelength conversion device 930, the light scattered by the surface scattering sheet 920 is incident on the wavelength conversion device, and an optical axis of the light emitted by the surface scattering sheet 920 is perpendicular to the wavelength conversion device, and a diameter D of the wavelength conversion device is a vertical direction of the paper surface.
The wavelength conversion means 930 has a disc shape comprising an annular region 931 provided with a wavelength converting material. The light emitted from the light source 910 is excitation light, and the excitation light excites the wavelength conversion material on the wavelength conversion device to generate lasing light, so that the wavelength conversion device emits lasing light or a mixture of lasing light and excitation light that is not excited. The light emitting device further includes a driving device 940, such as a motor, for driving the wavelength conversion device 930 to periodically rotate around the axis of the disk 930, so that each point on the excited track of the wavelength conversion device is in a state of being excited by a pulse, thereby reducing the local heating value of the wavelength conversion material and improving the light conversion efficiency of the wavelength conversion material.
The smaller the length of the excitation light spot in the circumferential direction, the smaller the local heating value of the wavelength conversion material without changing the circumference of the excited locus of the wavelength conversion device. For this reason, in the present embodiment, the predetermined direction is set to the vertical direction of the paper surface, that is, the direction perpendicular to the movement of the wavelength conversion device 930. The plane defined by the predetermined direction and the incident light L1 is a paper surface, and the surface scattering sheet 920 is disposed such that the normal L2 of the scattering surface is within the paper surface, so that the major axis direction of the elliptical spot T2 emitted from the surface scattering sheet 920 to the wavelength conversion device is a predetermined direction, i.e., perpendicular to the movement direction of the wavelength conversion device 930, and the minor axis direction is parallel to the movement direction of the wavelength conversion device 930. At this time, the length of the elliptical spot T2 in the circumferential direction of the wavelength conversion device is smallest, and the local heating value of the wavelength conversion material is smallest. Therefore, in this embodiment, by setting the predetermined direction to be perpendicular to the movement direction of the wavelength conversion device, the major axis of the elliptical spot on the wavelength conversion device is perpendicular to the movement direction of the wavelength conversion device, and the minor axis is parallel to the movement direction of the wavelength conversion device, so that the local heating value of the wavelength conversion material is minimized.
In other embodiments, the wavelength conversion device 930 may also be in the form of a ribbon, including a ribbon region with wavelength conversion material disposed thereon. Accordingly, the driving device 940 is used to drive the wavelength conversion device to periodically reciprocate linearly along a direction perpendicular to the paper surface, so as to improve the light conversion efficiency of the wavelength conversion material. At this time, the local heat generation amount of the wavelength conversion material can be minimized by setting the predetermined direction to the vertical direction of the paper surface, that is, the direction perpendicular to the movement direction of the wavelength conversion device such that the major axis of the elliptical spot on the wavelength conversion device is perpendicular to the movement direction of the wavelength conversion device and the minor axis is parallel to the movement direction of the wavelength conversion device.
In other embodiments, the optical axis of the light emitted from the surface scattering sheet 920 may be obliquely incident on the wavelength conversion device, and the light emitted from the surface scattering sheet 920 may not be directly incident on the wavelength conversion device, but be incident on the wavelength conversion device through an optical element such as a mirror, where a direction projected onto the moving surface of the wavelength conversion device when the light propagates to the wavelength conversion device along the optical path is required to be perpendicular to the moving direction of the wavelength conversion device, so that the short axis of the elliptical light spot on the wavelength conversion device is parallel to the moving direction of the wavelength conversion device, and the local heat generation of the wavelength conversion material is minimized. Of course, the predetermined direction may be set as: when the light propagates to the wavelength conversion device along the light path, the included angle between the direction projected to the movement surface of the wavelength conversion device and the movement direction of the wavelength conversion device is larger than 60 degrees and smaller than 90 degrees, and at the moment, the short axis of the elliptical light spot on the wavelength conversion device is relatively close to be parallel to the movement direction of the wavelength conversion device, so that the local heating value of the wavelength conversion material is smaller.
Further, the light emitting device 900 may further include an integrating rod located at the rear end of the optical path of the wavelength conversion device 930, where the integrating rod is used to collect the outgoing light of the wavelength conversion device. Preferably, the angle between the direction projected to the entrance plane of the integrating rod and the long side direction of the entrance when the preset direction propagates to the integrating rod along the light path is not more than 30 degrees; more preferably, the direction projected to the entrance plane of the integrating rod when the predetermined direction propagates to the integrating rod along the optical path is parallel to the long-side direction of the integrating rod, so that the long axis of the elliptical light spot emitted by the wavelength conversion device is parallel to the long-side direction of the entrance of the integrating rod, and the matching degree of the light spot and the entrance is improved.
Example IV
Referring to fig. 10, fig. 10 is a schematic structural diagram of another embodiment of a light emitting device according to an embodiment of the invention. As shown in fig. 10, the light emitting device 1000 includes a light source 1010, a surface scattering sheet 1020, a wavelength conversion device 1030, and a driving device 1040.
The differences between the present embodiment and the third embodiment include:
the light emitting device 1000 further includes a regulator 1050 for regulating an incident angle of the incident light L1 from the light source to the surface scattering sheet 1020. The adjuster may specifically include a mirror 1051 for reflecting incident light from the light source to the surface scattering sheet, and a driving device 1052 for driving the mirror to rotate, the driving device 1052 driving the mirror 1051 to rotate so as to change an incident angle of the incident light to the mirror. As can be seen from fig. 4d, the larger the incident angle of the incident light L1 to the surface scattering sheet, the larger the deflection angle, so the larger the aspect ratio of the polar shape of the scattering spot, for example, the larger the major axis-to-minor axis ratio of the elliptical spot. Thus, the desired spot aspect ratio can be achieved by the adjuster selecting the appropriate angle of incidence.
Further, the light emitting device 1000 may further include a controller (not shown) for controlling the adjuster 1050 according to a predetermined requirement, such that the adjuster adjusts an incident angle of the incident light L1 to the surface scattering sheet according to the predetermined requirement. For example, the controller may send control instructions to the drive 1052 to control the drive to rotate the mirror 1051 to a desired angle. The method can be applied to the automobile high beam, for example, the incidence angle of the high beam on the surface scattering sheet can be adjusted according to different vehicle speeds, so that scattering light spots with different length-width ratios are obtained, different high beam irradiation ranges are realized, for example, the higher the vehicle speed is, the smaller the transverse angle range of the high beam is, and the farther the irradiation distance is.
It is to be understood that the regulator and the controller in this embodiment are equally applicable to the first embodiment and the second embodiment.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The embodiment of the invention also provides a projection system, which comprises a light-emitting device, wherein the light-emitting device can have the structure and the functions in the above embodiments. The projection system may employ various projection technologies, such as liquid crystal display (LCD, liquid Crystal Display) projection technology, digital light path processor (DLP, digital Light Processor) projection technology. For example, the light emitting device emitting the laser light may be used as a light source of a projection system.
The embodiment of the invention also provides a lighting system, which comprises a light-emitting device, wherein the light-emitting device can have the structure and the functions in the above embodiments. For example, the above-described light emitting device may be applied to flashlight illumination, automobile lamp illumination, stage lighting, and the like.
The foregoing description is only of embodiments of the present invention, and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (10)
1. A light emitting device, comprising:
a light source;
the surface scattering sheet is used for scattering the incident light rays from the light source, and the incident light rays are obliquely incident on the scattering sheet, so that the light rays form a polar-shaped scattering light spot after passing through the scattering sheet; the normal line of the scattering surface of the surface scattering sheet is in a plane determined by the incident light and a preset direction, and the surface scattering sheet comprises a plane and a rough surface;
and a wavelength conversion device, wherein the light scattered by the surface scattering sheet is incident on the wavelength conversion device.
2. A light-emitting device according to claim 1, wherein: the light emitting device further comprises a driving device for driving the wavelength conversion device to periodically move, and an included angle between the direction projected to the moving surface of the wavelength conversion device and the moving direction of the wavelength conversion device when the preset direction propagates to the wavelength conversion device along the light path is larger than 60 degrees and not more than 90 degrees.
3. A light-emitting device according to claim 2, wherein: the direction projected to the moving surface of the wavelength conversion device when the predetermined direction propagates to the wavelength conversion device along the optical path is perpendicular to the moving direction of the wavelength conversion device.
4. A light-emitting device according to claim 3, wherein: the light-emitting device further comprises an integrating rod positioned at the rear end of the optical path of the wavelength conversion device, and an included angle between the direction projected to the entrance plane of the integrating rod and the long-side direction of the entrance is not more than 30 degrees when the preset direction propagates to the integrating rod along the optical path.
5. A light-emitting device according to claim 4, wherein: the direction projected to the entrance plane of the integrating rod when the preset direction propagates to the integrating rod along the light path is parallel to the long side direction of the integrating rod.
6. A light-emitting device according to any one of claims 1 to 5, wherein: the light emitting device further comprises a regulator for regulating the incident angle of the incident light ray incident on the scattering sheet.
7. The light-emitting device according to claim 6, wherein the regulator comprises:
a reflecting mirror for reflecting incident light rays from the light source to the surface scattering sheet;
and the driving device is used for driving the reflecting mirror to rotate so as to change the incident angle of the incident light ray entering the reflecting mirror.
8. A light-emitting device according to claim 6, wherein: the lighting device further comprises a controller for controlling the regulator according to a predetermined requirement.
9. A projection system comprising a light emitting device according to any one of claims 1 to 8.
10. A lighting system comprising a light emitting device according to any one of claims 1 to 8.
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| CN201610496703.7A CN107561834B (en) | 2016-06-30 | 2016-06-30 | Light-emitting device, related projection system and lighting system |
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| CN201610496703.7A CN107561834B (en) | 2016-06-30 | 2016-06-30 | Light-emitting device, related projection system and lighting system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113339750B (en) * | 2018-03-15 | 2023-04-07 | 株式会社小糸制作所 | Vehicle headlamp |
| CN110412817B (en) * | 2018-04-28 | 2024-05-03 | 中强光电股份有限公司 | Projection device and illumination system |
| CN112180661B (en) * | 2019-07-04 | 2022-08-02 | 无锡视美乐激光显示科技有限公司 | Scattering adjusting device, light source and projection system |
| CN113311654B (en) * | 2021-06-18 | 2022-11-18 | 青岛海信激光显示股份有限公司 | Projection light source and projection apparatus |
| CN113900339B (en) | 2020-06-22 | 2022-09-27 | 青岛海信激光显示股份有限公司 | Light source assembly and projection equipment |
| WO2021259270A1 (en) * | 2020-06-22 | 2021-12-30 | 青岛海信激光显示股份有限公司 | Light source assembly and projection device |
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| JP2015087421A (en) * | 2013-10-28 | 2015-05-07 | 株式会社Ｊｖｃケンウッド | Transmission type screen, and image display device using the same |
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| CN103597400A (en) * | 2011-04-12 | 2014-02-19 | 巴库股份有限公司 | Laser projector with reduced speckle |
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| CN107561834A (en) | 2018-01-09 |
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