CN103777450A - Light emitting device, projection display device and light emitting system - Google Patents
Light emitting device, projection display device and light emitting system Download PDFInfo
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- CN103777450A CN103777450A CN201410004778.XA CN201410004778A CN103777450A CN 103777450 A CN103777450 A CN 103777450A CN 201410004778 A CN201410004778 A CN 201410004778A CN 103777450 A CN103777450 A CN 103777450A
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Abstract
The invention provides a light emitting device, a projection display device and a light emitting system. A light emitting diode light source is comprised. A light emitting surface of the light emitting diode light source is rectangular, wherein the directions of two adjacent sides of the rectangle are respectively X and Y directions. A light collection lens is further comprised and is used for collecting lights emitted by the light emitting diode light source. The light collection lens at least comprises an optical curved surface. Intersection lines, which pass though an optical axis in X and Y directions, of the optical curved surface have different shapes, so that the light collection lens has different focal lengths in X and Y directions. According to the invention, the amplification factor of an outgoing light of the light emitting device in two mutually perpendicular directions can be separately controlled; the length-width ratio of the outgoing light is not limited by the light emitting diode light source; and through reasonable design, the light emitting device is matched with an optical system on the rear end to improve the efficiency.
Description
Technical Field
The present invention relates to the field of light sources, and more particularly, to a light emitting device, and a projection display device and a light emitting system using the same.
Background
Projection display technology is currently rapidly developing. The principle of projection display is that a light source is used to provide a light beam, which is irradiated onto a light valve, the light valve modulates the light to carry image information, and the light carrying the image information is projected by a projection lens to form a projection image. A light source has been conventionally used as a high-pressure mercury lamp light source, and a Light Emitting Diode (LED) light source has been widely used in projection display technology as a new light source in recent years, which has an advantage in that the life is longer than ten times that of the conventional light source.
However, one important problem with leds as light sources is that since projection screens are typically 4:3 or 16: 9, and therefore the light valve must match it, i.e. the light valve is also 4:3 or 16: 9 is rectangular. The light emitting surface of the led is rectangular, and the aspect ratio of the led often cannot be well matched with that of the light valve. Thus, when the light emitted from the light emitting diode is imaged on the modulation surface of the light valve, a part of the light on the image surface of the light emitting diode cannot be used in order to cover the entire modulation surface of the light valve, which results in a loss of efficiency.
Disclosure of Invention
In view of the above problems, the present invention provides a light emitting device, which includes a light emitting diode light source, wherein a light emitting surface of the light emitting diode light source is rectangular, and two adjacent sides of the rectangle are respectively oriented in an x direction and a y direction; the light collecting lens is used for collecting light emitted by the light emitting diode light source; the light collection lens at least comprises one optical curved surface, and the sectional line of the optical curved surface passing through the optical axis in the x direction and the sectional line of the optical curved surface passing through the optical axis in the y direction are different in shape, so that the focal length of the light collection lens in the x direction is different from the focal length of the light collection lens in the y direction.
The invention also provides a projection display device, which comprises the light-emitting device and a digital micro-mirror device light valve, wherein light emitted by the light-emitting device is incident on the digital micro-mirror device light valve and carries image information through modulation of the light.
The invention also provides a light-emitting system which comprises the light-emitting device, wherein the aperture and the angle of the light beam emitted by the light-emitting device are matched with the receiving aperture and the receiving angle of the receiving optical system at the rear end of the light-emitting device.
The amplification factors of the emergent light of the light-emitting device in two mutually perpendicular directions can be respectively controlled, so that the length-width ratio of the emergent light is not limited by a light-emitting diode light source, and the emergent light can be matched with an optical system at the rear end of the light-emitting device through reasonable design to improve the efficiency.
Drawings
FIG. 1a is a front view of a first embodiment of a light emitting device of the present invention as seen from the y-direction;
FIG. 1b is a front view of the first embodiment of the light emitting device of the present invention as seen from the x-direction;
FIG. 1c is a bottom view of the first lens of the light collection lens assembly of the light emitting device of the present invention;
FIG. 2a is a front view of another embodiment of the present invention as seen from the y-direction;
FIG. 2b is a front view of the embodiment of FIG. 2a as seen from the x-direction;
FIG. 3a is a schematic structural diagram of another embodiment of the present invention;
FIG. 3b is a top view of the reflective ring of the embodiment shown in FIG. 3 a;
FIG. 4 is a schematic structural diagram of another embodiment of the present invention;
FIG. 5 is a schematic structural diagram of another embodiment of the present invention;
FIG. 6a is a schematic diagram of the laser spot on the wavelength conversion layer in the embodiment of FIG. 5 assuming that the light collection lenses are the same in both the x-direction and the y-direction;
FIG. 6b is a schematic diagram showing the laser spot on the wavelength conversion layer when the laser fast axis is along the direction of smaller focal length of the light collection lens;
FIG. 6c is a schematic diagram of a light spot of the laser light on the wavelength conversion layer after the collimating lens is defocused based on FIG. 6 b;
FIG. 7 is a schematic diagram of the operation of the micromirrors in the light valve of the digital micromirror device.
Detailed Description
The invention provides a light-emitting device, and the structure schematic diagram of a first embodiment of the light-emitting device is shown in fig. 1a and 1 b. The light-emitting device comprises a light-emitting diode light source 101, wherein the light-emitting surface of the light-emitting diode light source 101 is rectangular, and the directions of two adjacent sides of the rectangle are respectively in the x direction and the y direction. Fig. 1a shows a front view of the luminaire as seen in the direction of the y-direction, while fig. 1b shows a front view of the luminaire as seen in the direction of the x-direction (see coordinate system schematic in the lower left corner of the two figures). It will be understood that the length of the led light source 101 in fig. 1a is the length of the side that runs in the x direction, whereas the length of the led light source 101 in fig. 1b is the length of the side that runs in the y direction. It is clearly apparent that the two sides are different, so that the light-emitting surface of the led light source is rectangular in this exemplary embodiment. In practice, these two sides may also be identical, in which case the light-emitting surface of the led light source is square.
The light-emitting device further comprises a light-collecting lens, which in this embodiment is a light-collecting lens group, and is composed of two lenses 102 and 103, and the light-collecting lens group is used for collecting light emitted by the led light source 101. The lens 102 includes two optical curved surfaces 102a and 102b in sequence along the optical path direction, the optical curved surface 102a is a concave surface and is represented by a fine grain grid in the figure; the lens 102 includes two optical curved surfaces 103a and 103b in order along the optical path direction, where the optical curved surface 103b is represented by a coarse grid. In the present embodiment, the optical curved surface 102a and the optical curved surface 103b have the following features: the sectional line passing through the optical axis in the x direction and the sectional line passing through the optical axis in the y direction have different shapes. This can be seen by comparing fig. 1a and 1 b. The width of the optical curved surface 102 in fig. 1a is significantly wider than the width of the optical curved surface 102 in fig. 1b, while the lower edge line 103c of the optical curved surface 103b in fig. 1a is a curve with a downward convex center, and the lower edge line 103c of the optical curved surface 103b in fig. 1b is a curve with an upward convex center, which indicates that the sectional lines of the curved surface 103b in the x and y directions are different on a lens with a circular aperture, and the curvature along the y direction is larger and the focal length is smaller. Fig. 1c further shows a bottom view of the optically curved surface 102 a.
It can be understood that due to the presence of the optically curved surface in the light collection lens having different curvatures in the x-direction and the y-direction, this causes the focal length of the light collection lens in the x-direction to be different from the focal length in the y-direction. This further makes the magnification of the light collection lens different for the side of the light emitting diode light source 101 in the x direction and the side in the y direction. Therefore, the magnification of the light collecting lens in the x direction and the magnification of the light collecting lens in the y direction can be reasonably designed to control the imaging shape of the light emitting diode light source on the light valve, and the imaging shape can be reasonably matched with the length-width ratio of the light valve without being limited by the shape of the light emitting surface of the light emitting diode light source, so that the efficiency is maximized.
In practical applications, the light-emitting device may not be a light valve but another light-receiving element, which has a limitation on the aperture or incident angle of incident light. The light valve is only one of such limited light receiving elements, which is a limitation on the aspect ratio of the beam aperture, and in the case of a fly-eye lens having a rectangular unit, there is a limitation on the proportion of incident angles of an incident beam in two mutually orthogonal directions. For example, if the length-to-width ratio of the fly-eye lens unit is 4:3, the divergence angle ratio of the light beam incident on the fly-eye lens unit in the long direction and the wide direction should be approximately 4:3, and if the ratio is not matched, the excessive part of the angle light forms side lobes and cannot be used.
For the respective control of the curvatures in the x direction and the y direction in the light collecting lens, the respective focal lengths of the light collecting lens in the two directions can be controlled, and further the respective divergence angles or the magnification factors of the emergent light of the light emitting diode light source in the two directions can be controlled. In practice the divergence angle corresponds to the imaging magnification in the far field, so the divergence angle and the magnification are uniform.
For example, a light emitting diode chip is 1.2mm long in the x-direction and 2.0mm long in the y-direction, and if the same light collecting lens is used in the x-direction and the y-direction, a light spot with a length-to-width ratio of 3:5 or a light beam with a divergence angle ratio of 3:5 is formed. For an aspect ratio of 3: this is clearly a mismatch for the 4 light valve. Using the light collecting lens of the invention with a magnification of e.g. 2 x in the x-direction and e.g. 1.6 x in the y-direction, a spot with an aspect ratio of 2.4:3.2, i.e. 3:4, is formed, which exactly matches the aspect ratio of the light valve.
In this embodiment, the light collecting lens group is composed of two lenses, wherein two optical curved surfaces are different in the x direction and the y direction. In practice, this is only an example, and the light collecting lens may be only one lens, or a lens group consisting of two or more lenses, and the light collecting lens includes at least one optical curved surface that is different in the x direction and the y direction.
Since the light collecting lens collects the light emitted from the led light source 101 in both the x-direction and the y-direction, the focal points of the light collecting lens in the x-direction and the y-direction are preferably coincident with the light emitting surface of the led light source 101, so that the collecting efficiency in both directions is relatively high. Since the focal lengths of the light collection lenses in the two directions are different, this means that the positions of the main faces of the light collection lenses in the x direction and the y direction are different.
Fig. 2a and 2b show schematic structural diagrams of another embodiment of the light-emitting device of the present invention, wherein fig. 2a uses the same coordinate system as fig. 1a, and fig. 2b uses the same coordinate system as fig. 1b, i.e., fig. 2a is a front view taken along the y-direction, and fig. 2b is a front view taken along the x-direction. Unlike the embodiment shown in fig. 1a and 1b, the light-emitting device of this embodiment further includes a light recycling device 205 for reflecting a part of the light emitted from the led light source 201 at the exit angle back to the led light source 201.
Specifically, in the present embodiment, the light recycling device 205 is a light reflecting bowl 205 covering the led light source and located between the led light source 201 and the light path of the light collecting lens, the inner wall of the light reflecting bowl 205 is a reflecting surface 205a, which can reflect the large-angle light (e.g. the light ray 212) emitted from the led light source 201, and the rest of the angle light (e.g. the light ray 211) can transmit through the opening at the top of the light reflecting bowl and be normally collected by the light collecting lens. The light 212 reflected by the reflector 205 returns to the led light source 201 and is scattered and reflected by the led light source 201 and exits therefrom, wherein the light with a smaller angle can be collected by the light collecting lens, and the light with a larger angle can be reflected again by the reflector, so that most of the light emitted by the led light source can be collected by the light collecting lens within a smaller angle concentrated at the center after the above cycle. This has the advantage that the divergence angle of the light is efficiently compressed by the action of the reflector, which helps to reduce the etendue of the light beam and to improve the brightness.
Further, in the present embodiment, as can be seen by comparing fig. 2a and fig. 2b, the opening widths of the top ends of the light reflecting bowls are different in the x direction and the y direction, which actually correspond to different light receiving angles of the light collecting lenses in the x direction and the y direction. The opening of the visible light reflecting bowl can be adjusted according to the design of the light collecting lens, and if the light collecting angles of the light collecting lens in two directions are different, the range of the emergent angles of the reflected light of the light reflecting bowl is different accordingly. For example, if the light collection lens collects 60 degrees in the x-direction and 45 degrees in the y-direction, the light reflecting bowl reflects 60 to 90 degrees in the x-direction and 45 to 90 degrees in the y-direction. This maximizes the use of light energy.
In the embodiment shown in fig. 2a and 2b, the light recovery means is a light reflecting bowl, but in practice the light recovery means may also be other forms of optical elements. For example, in another embodiment of the present invention, as shown in fig. 3a, the light recycling device in the light emitting device is a reflective ring 305 located inside the light collecting lens, and the high-angle light 312 emitted from the led light source 301 passes through the first collecting lens and then is incident on the reflective ring 305, reflected by the first collecting lens and finally incident on the surface of the led light source 301. A top view of the reflective ring 305 is shown in fig. 3 b. The reflective ring can also be located at the rear end of the light path of the light collecting lens, as shown in the embodiment shown in fig. 4, the large-angle light 412 emitted from the led light source 401 is collected and collimated by the light collecting lens, then enters the reflective ring 405, and returns to the led light source surface after being reflected by the reflective ring 405. The reflective ring shown in fig. 3a and 4 is larger in size and easier to machine than the reflector shown in fig. 2a, and its sectional line may be straight or curved, but it has the disadvantage that less light can be reflected back to the led light source, and therefore is less efficient.
Fig. 5 is a schematic structural diagram of another embodiment of the light emitting device of the present invention, which is different from the above embodiments in that the led light source 501 includes an led chip and a wavelength conversion layer covering the surface of the led chip, and the light emitted from the led chip excites the wavelength conversion layer to emit stimulated light; the laser device further comprises a laser source 506, and laser 513 emitted by the laser source 506 is incident on the wavelength conversion layer from the upper part of the wavelength conversion layer after passing through the light collecting lens and generates stimulated light 511. The upper side of the wavelength conversion layer herein refers to a light emission direction of the received laser light generated by the wavelength conversion layer.
The wavelength conversion layer is more bright because it can be excited from both directions by the light emitted by the led chip and the laser light 513. In this embodiment, a collimating lens 507 is further included to collimate the laser light source, and the collimating lens 507 may be omitted if the light emitted from the laser light source itself is sufficiently collimated. The light emitting device of this embodiment further includes a spectral filter 508 for transmitting the laser beam 513 and reflecting the received laser beam 511, so that the emitted received laser beam 511 can be guided to be separated from the optical path of the laser beam 513, and the received laser beam 511 is placed to be incident on the laser beam 506, which causes efficiency loss. In practice, the beam splitting filter may also be another beam splitting device, such as a centrally apertured mirror that directs the laser light 506 through the aperture while directing the reflected laser light from a mirror around the aperture. The optical splitting device is a prior art, and there are many patent documents and literatures that can explain this problem in detail, so it is not described here any more.
If the light collection lens is the same in the x-direction and the y-direction, the spot formed by the laser light 513 incident on the wavelength conversion layer will be a long stripe, as shown in fig. 6 a. Fig. 6a is a top view of wavelength conversion layer 601, and spot 613 is a spot formed on which laser 513 is incident. The shape of the spot 613 is determined mainly by the characteristics of the laser itself. The angle of the laser in the fast axis direction is large, and the angle of the laser in the slow axis direction is much smaller, so that the fast axis direction is the long side direction of the strip-shaped light spot. Preferably, in this embodiment, the fast axis direction of the laser light emitted by the laser light source is parallel to the direction in which the focal length of the light collection lens is shorter in the x direction and the y direction. So that the light in the fast axis direction will be more compressed and the spot thus formed is shown in fig. 6b as 613 b. Spot 613b can be magnified in equal proportion by defocusing collimating lens 507 at this time, resulting in spot 613c as in fig. 6 c. Compared with the spot 613a in fig. 6a, the length of the long axis of the spot 613c is the same, but the short axis is larger, so the spot area is larger, which is beneficial to reducing the optical power density of the laser and improving the conversion efficiency of the wavelength conversion layer.
It is obvious that the light recycling device in the embodiments shown in fig. 2a to 4 can also be applied to the present embodiment to improve the light emitting brightness.
The invention further provides a projection display device, which includes the light emitting device, and further includes a digital micro-mirror device (DMD) light valve, wherein light emitted by the light emitting device is incident on the DMD light valve and modulated by the DMD light valve to carry image information.
The schematic diagram of the micromirrors in the dmd light valve is shown in fig. 7, where the rotation axis 782 of the micromirror 781 runs in the u-direction. The micro-mirror 781 is flipped in a plane perpendicular to the u-direction over a small range of flip angles, typically plus or minus 12 degrees, which limits the divergence angle of the light cone incident on the light valve of the dmd, since if the divergence angle is greater than plus or minus 12 degrees, the micro-mirror 781 is insufficient to separate the light cone of the incident light and the reflected light by flipping.
That is, just because the turning of the micro-mirrors 781 limits the angular range of the incident light cone in the turning direction, the angular range of the incident light cone in the direction of the axis (i.e., the u direction) is not limited, i.e., the divergence angle of the incident light cone in the u direction can be greater than plus or minus 12 degrees. It will be appreciated that the greater the angle of incidence allowed, the more light can enter the light valve and the brighter the projected image. By utilizing the characteristic that the proportion of the light emitted by the light-emitting device can be respectively controlled in two vertical dimensions, the divergence angle of the light cone 711 of the light valve of the digital micro-mirror device, which is incident to the light-emitting device, in the u direction is larger than the divergence angle in the direction vertical to the u direction, so that the brightness can be improved.
The invention also provides a light-emitting system which is characterized by comprising the light-emitting device, wherein the aperture and the angle of the light beam emitted by the light-emitting device are matched with the receiving aperture and the receiving angle of the receiving optical system at the rear end of the light-emitting device.
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 light emitting device, characterized in that:
the LED light source comprises an LED light source, wherein the light emitting surface of the LED light source is rectangular, and the directions of two adjacent sides of the rectangle are respectively in the x direction and the y direction;
the light collecting lens is used for collecting light emitted by the light emitting diode light source; the light collection lens at least comprises one optical curved surface, and the sectional line of the optical curved surface passing through the optical axis in the x direction and the sectional line of the optical curved surface passing through the optical axis in the y direction are different in shape, so that the focal length of the light collection lens in the x direction is different from the focal length of the light collection lens in the y direction.
2. The lighting device of claim 1, wherein the focal points of the light collection lens in the x-direction and the y-direction coincide with the light emitting surface of the led light source.
3. The apparatus of claim 1, further comprising light recycling means for reflecting a portion of the exit angle light from the led light source back to the led light source.
4. The lighting device according to claim 3, wherein:
the light recovery device is a reflecting bowl which is positioned between the light-emitting diode light source and the light path of the light collecting lens and covers the light-emitting diode light source; or,
the light recovery device is a reflection ring positioned inside the light collection lens or at the rear end of the light path.
5. A light-emitting device according to claim 3, wherein the light-recycling means is different in the range of the exit angles of the reflected light in the x-direction and the y-direction.
6. The light-emitting device of claim 1, wherein the led light source comprises an led chip and a wavelength conversion layer covering a surface of the led chip, the wavelength conversion layer emitting stimulated light; the laser light source is used for emitting laser light, and the laser light emitted by the laser light source is incident on the wavelength conversion layer from the upper part of the wavelength conversion layer after passing through the light collecting lens and generates received laser light.
7. The light-emitting device according to claim 6, wherein the fast axis direction of the laser light emitted from the laser light source is parallel to the direction in which the focal length of the light collection lens is shorter in the x direction and the y direction.
8. A projection display apparatus comprising the light-emitting apparatus according to any one of claims 1 to 7, and further comprising a dmd light valve, wherein light emitted from the light-emitting apparatus is incident on the dmd light valve and modulated by the dmd light valve to carry image information.
9. The projection display apparatus according to claim 8, wherein the rotation axis of the micromirror in the dmd light valve is oriented in the u direction, and the divergence angle of the light cone of the light-emitting device incident on the dmd light valve in the u direction is larger than the divergence angle in the direction perpendicular to the u direction.
10. A light emitting system comprising the light emitting device according to any one of claims 1 to 7, wherein an aperture and an angle of a light beam emitted from the light emitting device are matched with a receiving aperture and a receiving angle of a receiving optical system at a rear end thereof.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410004778.XA CN103777450A (en) | 2014-01-06 | 2014-01-06 | Light emitting device, projection display device and light emitting system |
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| CN201410004778.XA CN103777450A (en) | 2014-01-06 | 2014-01-06 | Light emitting device, projection display device and light emitting system |
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| CN113253551A (en) * | 2021-06-07 | 2021-08-13 | 荆门市探梦科技有限公司 | Holographic projector and holographic display system |
| CN114371587A (en) * | 2020-10-14 | 2022-04-19 | 青岛海信激光显示股份有限公司 | Projection optical system |
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Application publication date: 20140507 |