CN116624804A

CN116624804A - Compact vehicle-mounted DLP projection system and vehicle

Info

Publication number: CN116624804A
Application number: CN202310670778.2A
Authority: CN
Inventors: 刘岳飞; 宋健; 武中; 熊衍建
Original assignee: Changzhou Xingyu Automotive Lighting Systems Co Ltd
Current assignee: Changzhou Xingyu Automotive Lighting Systems Co Ltd
Priority date: 2023-06-07
Filing date: 2023-06-07
Publication date: 2023-08-22

Abstract

The utility model relates to the field of illumination, and discloses a compact vehicle-mounted DLP projection system and a vehicle, wherein the compact vehicle-mounted DLP projection system comprises a light source; the condensing lens is arranged on an emergent path of incident light rays emitted by the light source; the light splitting sheet is correspondingly arranged in the light condensing direction of each light condensing lens; and a display chip adapted to receive the incident light processed by the plurality of light splitting sheets; and a reflector is arranged between the projection lens group and the display chip and is suitable for reflecting incident light rays passing through the display chip to the projection lens group for imaging. According to the utility model, DMD illumination is realized in a critical illumination mode, so that the number of system elements is reduced, and the structure is more compact; in addition, the use of the cylindrical lens can not increase the optical expansion amount, and the relative caliber of the projection lens group can be smaller; meanwhile, the use of the cylindrical lens does not increase the optical expansion amount, and the beam divergence angle of the illuminating DMD is smaller, so that the overlapping of an illuminating light path and a projection light path can be reduced.

Description

Compact vehicle-mounted DLP projection system and vehicle

Technical Field

The utility model relates to the technical field of illumination, in particular to a compact vehicle-mounted DLP projection system. In addition, the utility model also relates to a vehicle.

Background

Currently, a Micro projection optical engine generally adopts DLP (Digital Light Processing) technology of texas instruments in united states, a main image and a light modulation Device of the Micro projection optical engine are called as a Digital Micro-mirror Device (DMD), 50-130 ten thousand Micro mirrors are arranged on the DMD, each Micro mirror can be controlled to deflect by +/-12 degrees, the Micro mirrors respectively correspond to an on state and an off state, the Micro mirrors in the on state can reflect light of an illumination system into a projection system, a pixel point is formed on a projection surface, and in order to adapt to the working deflection mode of the DMD and obtain a uniform illumination effect, compound eyes are generally used for carrying out dodging, and then a relay lens is used for realizing kohler illumination on the DMD in the prior art.

In a conventional DLP projection system, in order to obtain a uniform illumination effect, compound eyes are generally used for homogenizing and shaping, in order to avoid light-crosstalk loss, a short side of a micromirror must be designed without light-crosstalk, and according to the principle of conservation of optical expansion, a longer light beam divergence angle is generated on the long side.

The use of compound eyes has the following disadvantages:

1. the projection lens of the fly-eye lens scheme is more complex in design, when the collimated light beam passes through the fly-eye, the divergence angle of the light beam in the long side direction is increased, but the light beam height is unchanged, the optical expansion amount of the rear end is increased, and the caliber of a projection end system is increased to ensure enough light receiving efficiency;

2. the compound eye lens has lower light efficiency, firstly, transition fillets are necessarily arranged among the compound eye micro lenses, and light rays passing through the transition fillets are more easily absorbed or scattered to generate loss; secondly, the compound eye surface coating is difficult, and the inherent Fresnel loss is high; thirdly, the light rays with large divergence angles are easier to form overlapping interference in an illumination light path and a projection light path;

3. the cost of the fly-eye lens is high, the manufacturing of the fly-eye lens needs to be performed by using a high-precision die for injection molding, and meanwhile, a piece of relay lens needs to be added, the number of elements is more, and the overall cost is higher;

4. in the compound eye scheme, due to the inherent sizes of the compound eye and the relay lens, an unused space is formed between the LED and the projection lens, such as the interval between the light source and the projection lens in the Chinese patent application No. CN215954055U, the space utilization rate is low, and meanwhile, the projection lens is more complex, so that the whole volume is larger.

In view of this, there is a need to design a compact vehicle-mounted DLP projection system to meet the practical needs.

Disclosure of Invention

In view of the above-mentioned problems, a first aspect of the present utility model provides a compact vehicle-mounted DLP projection system capable of reducing the number of system components while ensuring imaging optical efficiency

A second aspect of the present utility model provides a vehicle that reduces the number of system components while ensuring imaging optical efficiency.

To solve the above technical problem, a first aspect of the present utility model provides a compact vehicle-mounted DLP projection system, including:

a light source;

the condensing lens is arranged on an emergent path of incident light rays emitted by the light source;

the light splitting sheet is correspondingly arranged in the light condensing direction of each light condensing lens; and

a display chip adapted to receive incident light processed by the plurality of light splitting sheets;

the projection lens group is provided with a reflector between the projection lens group and the display chip, and the reflector is suitable for reflecting incident light rays passing through the display chip to the projection lens group for imaging.

Preferably, the light source includes an LED G light source, an LED R light source, and an LED B light source.

Still preferably, the condensing lens includes a first condensing lens, a second condensing lens and a third condensing lens, the first condensing lens is respectively and correspondingly disposed on an outgoing path of each light source, the second condensing lens and the second condensing lens are both disposed on a condensing direction of the first condensing lens, the second condensing lens is disposed corresponding to the LED G light source and the LED R light source, and the third condensing lens is disposed corresponding to the LED B light source.

Preferably, the light splitting sheet includes a first light splitting sheet and a second light splitting sheet, the first light splitting sheet is a GB-transparent R-reflective light splitting sheet, the second light splitting sheet is a RG-transparent B-reflective light splitting sheet, the first light splitting sheet is disposed in a light condensing direction of the second light condensing lens so as to be capable of combining light collected by the second light condensing lens, and the second light splitting sheet is disposed on an outgoing path of the third light condensing lens and the first light splitting sheet so as to be capable of combining light collected by the third light condensing lens via the second light splitting sheet and light combined via the first light splitting sheet.

Further preferably, a cylindrical lens and a field lens are arranged between the second light-splitting sheet and the display chip in sequence,

the cylindrical lens is suitable for converging the light passing through the second light splitting piece in the x direction, and the light is unchanged in the y direction;

the field lens is suitable for receiving and refracting the light rays converged by the cylindrical lens and forming illumination light spots on the display chip, and the field lens is suitable for converging the light rays reflected by the display chip so as to reduce the height of the light rays.

Preferably, the display chip is provided with a plurality of microlenses, and the microlenses are suitable for being turned on or turned off, so as to reflect the illumination light spots irradiated on the microlenses via the microlenses in an on state into the projection lens group, so as to realize corresponding pixel projection.

Further preferably, the included angle between the field lens and the display chip in the y axis ranges from 18 degrees to 24 degrees, the included angle between the reflecting mirror and the y axis ranges from 50 degrees to 60 degrees, and the projection lens group is perpendicular to the x axis.

Preferably, the F number of the projection lens group is between 2.0 and 3.0.

Further preferably, the cylindrical lens has different curvatures in the x-axis and y-axis directions, wherein one surface of the cylindrical lens is a plane, and the radius of curvature of the other surface in the x-direction is 15-23 mm.

A second aspect of the present utility model provides a vehicle employing the compact on-board DLP projection system of the first aspect of the present utility model.

Through the above preferable technical scheme, the compact vehicle-mounted DLP projection system realizes DMD illumination in a critical illumination mode, reduces the number of system elements, and has a more compact structure; in addition, the use of the cylindrical lens can not increase the optical expansion amount, the relative caliber of the projection lens can be smaller, and the projection lens is simpler in design; meanwhile, the use of the cylindrical lens can not increase the optical expansion amount, and the beam divergence angle of the illuminating DMD is smaller, so that the overlapping of an illuminating light path and a projection light path can be reduced, and meanwhile, the cylindrical lens can be coated so as to improve the transmittance of the cylindrical lens, thereby reducing the related light efficiency loss.

Additional features and advantages of the utility model will be set forth in the detailed description which follows.

Drawings

FIG. 1 is a schematic diagram of a compact vehicle-mounted DLP projection system according to an embodiment of the present utility model;

FIG. 2 is an optical path diagram of a compact vehicle-mounted DLP projection system according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a cylindrical lens of a compact vehicle-mounted DLP projection system according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of a compact vehicle-mounted DLP projection system according to another embodiment of the present utility model.

Reference numerals

1 LED G light source 2 LED R light source

First condensing lens of 3 LED B light source 4

5. Second condenser lens 6 third condenser lens

7. First light-splitting sheet 8 second light-splitting sheet

9. Cylindrical lens 10 reflector

11. Display chip of field lens 12

13. Eccentric lens of projection lens group 9

10' TIR prism

Detailed Description

The following describes specific embodiments of the present utility model in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "configured," and "connected" are to be construed broadly, and for example, the term "connected" may be a fixed connection, a removable connection, or an integral connection; either directly or indirectly via an intermediate medium, or in communication with each other or in interaction with each other. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 1, a compact vehicle-mounted DLP projection system according to an embodiment of the present utility model includes a light source, where the light source includes at least an LED G light source 1, an LED R light source 2, and an LED B light source 3, and the three light sources can emit three different light rays. And, be provided with the condenser lens respectively on the exit path of three kinds of light sources, condenser lens includes first condenser lens 4, second condenser lens 5 and third condenser lens 6, wherein, first condenser lens 4 corresponds respectively and sets up on the exit path of above-mentioned three kinds of light sources, consequently, can assemble the light that above-mentioned three kinds of light sources sent through first condenser lens 4, then, the light after first condenser lens 4 gathers is to second condenser lens 5 and third condenser lens 6, wherein, second condenser lens 5 corresponds to LED G light source 1 and LED R light source 2 setting, third condenser lens 6 corresponds to LED B light source 3 setting, and, because the G light path difference that LED G light source 1 sent is huge, therefore, need to compensate it through third condenser lens 6, the first condenser lens 4 and the second condenser lens 5's in R, G light path that LED G light source 1 and LED R light source 2 sent make up the focal length between 3.8 ~ 7.1mm, numerical aperture NA is not less than 0.8, the numerical aperture NA that LED B light source 3 sent out in the light path B light path 4 and second condenser lens 5's the focal length 4 and the focal length that the numerical aperture is not under the same, the same range of high-quality and the numerical aperture that the numerical aperture is not guaranteed at the same time, the illumination light path is not more than 5.8.5 mm. It should be noted that the number of the condensing lenses may be two or more, so that the numerical aperture of the condensing lenses is higher than 0.8, and more than 70% of the energy of the LEDs can be collected.

The light-splitting sheets are correspondingly arranged in the light-condensing directions of the light-condensing lenses, each light-splitting sheet comprises a first light-splitting sheet 7 and a second light-splitting sheet 8, the first light-splitting sheet 7 is a light-transmitting GB (reflection) R light-splitting sheet, and the second light-splitting sheet 8 is a light-transmitting RG (reflection) B light-splitting sheet. When the light rays emitted by the LED G light source 1 and the LED R light source 2 pass through the first condensing lens 4 and the second condensing lens 5 to form a converging light beam with a smaller divergence angle, then the converging light beam reaches the GB-transparent R-transparent light splitting sheet, the G light emitted by the LED G light source 1 is directly transmitted, the R light is reflected to form a combined light beam of the G light and the R light, then the combined light beam of the G light and the R light continues to spread rightward, the light rays emitted by the LED B light source 3 pass through the first condensing lens 4 and the third condensing lens 6 to form a converging light beam with a small divergence angle, and the surface of the RG-transparent R-transparent light splitting sheet is plated with the RG-transparent B-transparent light splitting sheet, so that the R light and the G light can directly transmit the surface and the B light is reflected, and R, G, B light beam combination is finally realized.

The display chip 12 can receive the incident light processed by the plurality of light splitting sheets, the adopted display chip 12 is a DMD chip, the incident light is R, G, B light combined beam, therefore, a cylindrical lens 9 and a field lens 11 are sequentially arranged between the display chip 12 and the light splitting sheets, when R, G, B light combined beam passes through the cylindrical lens 9, the cylindrical lens 9 can collect the light passing through the second light splitting sheet 8 in the x direction, and basically keeps unchanged in the y direction, finally, after R, G, B light combined beam passes through the field lens 11, a certain proportion of illumination light spots can be formed on the DMD chip, and the display chip 12 is provided with a plurality of micro lenses which are suitable for being turned on or off, so that the illumination light spots irradiated on the micro lenses in an on state can be reflected into the projection lens group 13 through the micro lenses in an on state, and corresponding pixel projection can be realized.

A reflector 10 is disposed between the projection lens group 13 and the display chip 12, and the reflector 10 is adapted to reflect the incident light passing through the display chip 12 to the projection lens group 13 for imaging.

Referring to fig. 2, the included angle between the field lens 11 and the display chip 12 in the y-axis is 18 ° to 24 °, the included angle between the reflective mirror and the y-axis is 50 ° to 60 °, and in this angle range, the illumination light can be incident on the DMD chip at an incident angle of 12 ° to 36 °, and the projection lens group 13 is kept perpendicular to the x-axis.

Referring to fig. 3, the cylindrical lens 9 has different curvatures in the x and y directions, wherein one direction is a plane, and the curvature radius of the other direction is between 15 and 23mm, and in the curvature radius range, the illumination light spots on the surface of the DMD chip can have a ratio of 1.5-1.8:1. Under the current light source arrangement, the transparent GB (gallium nitride) reflective R (light-splitting) sheet can realize cut-off at a spectral position of 590+/-30 nm through a coating, the spectral transmittance with the wavelength smaller than 590+/-30 nm is larger than 95%, and the spectral reflectance with the wavelength larger than 590+/-30 nm is larger than 97%; the light-transmitting RG reflection B light-splitting sheet can realize cut-off at a 490+/-30 nm spectral position, the spectral transmittance with the wavelength larger than 490+/-30 nm is larger than 95%, the spectral reflectance with the wavelength smaller than 490+/-30 nm is larger than 97%, and when the cut-off wave band of the film-coating curve is in the above range, the output luminous flux is the highest when the light color is 4500K-6500K. The F number of the projection lens group 13 is between 2.0 and 3.0, so that all light rays which can be reflected by the DMD chip in the on state can be collected.

It should be noted that, the LED light sources are the LED G light source 1, the LED R light source 2 and the LED B light source 3, the corresponding light splitting sheets are the transparent GB reflective R light splitting sheet and the transparent RG reflective B light splitting sheet, and the cut-off wave bands of the corresponding dichroic films are 590±30nm and 490±30nm, but the protection scope of the present utility model is not limited to the above description, other LED types, and the light splitting sheets and the film systems thereof are adjusted due to different LED arrangements, but the scheme of realizing illumination and light spot proportion change by using the imaging principle and the asymmetric plane belongs to the protection scope of the present utility model.

Referring to fig. 4, in another embodiment of the compact vehicle-mounted DLP projection system of the present utility model, the cylindrical lens 9 and the reflective mirror 10 may be replaced by the eccentric lens 9 'and the TIR prism 10', respectively, so as to turn the light path, wherein one surface of the eccentric lens 9 'is a spherical surface, so as to further correct imaging aberration, improve imaging quality, and the other surface is a cylindrical surface a, and shape one direction of the light beam, so as to implement a proportional change of the illumination surface, and simultaneously perform an eccentric process on the whole, so as to compensate the optical path difference brought by the TIR prism 10'.

The present utility model provides a vehicle employing the compact on-board DLP projection system of the present utility model and thus also has the above-described advantages.

The compact vehicle-mounted DLP projection system realizes critical illumination by using an imaging principle, realizes the proportion change of illumination light spots by using asymmetric surfaces such as a cylindrical lens 9, and realizes the purposes of high light efficiency and small volume by carrying out differential design on each light path according to different wavelengths or light paths.

In the description of the present utility model, reference to the terms "one embodiment," "some embodiments," "an implementation," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In the present utility model, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited thereto. Within the scope of the technical idea of the utility model, a plurality of simple variants of the technical proposal of the utility model can be carried out, comprising that each specific technical feature is combined in any suitable way, and in order to avoid unnecessary repetition, the utility model does not need to be additionally described for various possible combinations. Such simple variations and combinations are likewise to be regarded as being within the scope of the present disclosure.

Claims

1. A compact, on-board DLP projection system, comprising:

a light source;

a display chip (12), the display chip (12) being adapted to receive incident light rays processed via a plurality of the light splitting sheets;

the projection lens group (13), be equipped with reflector (10) between projection lens group (13) with display chip (12), the reflector is suitable for the reflection is passed through behind display chip (12) incident light extremely projection lens group (13) is formed images.

2. The compact vehicle-mounted DLP projection system of claim 1, wherein the light sources include an LED G light source (1), an LED R light source (2), and an LED B light source (3).

3. The compact vehicle-mounted DLP projection system according to claim 2, wherein the condenser lens comprises a first condenser lens (4), a second condenser lens (5) and a third condenser lens (6), the first condenser lens (4) is respectively and correspondingly arranged on the outgoing path of each light source, the second condenser lens (5) and the second condenser lens (6) are both arranged in the condensing direction of the first condenser lens (4), and the second condenser lens (5) is arranged corresponding to the LED G light source (1) and the LED R light source (2), and the third condenser lens (6) is arranged corresponding to the LED B light source (3).

4. The compact vehicle-mounted DLP projection system according to claim 1, wherein the light splitting sheet comprises a first light splitting sheet (7) and a second light splitting sheet (8), the first light splitting sheet (7) is a transmissive GB reflective R light splitting sheet, the second light splitting sheet (8) is a transmissive RG reflective B light splitting sheet, the first light splitting sheet (7) is disposed in a light condensing direction of the second light condensing lens (5) so as to be capable of combining light collected by the second light condensing lens (5), and the second light splitting sheet (8) is disposed on an outgoing path of the third light condensing lens (6) and the first light splitting sheet (7) so as to be capable of combining light collected by the third light condensing lens (6) via the second light splitting sheet (8) and light combined via the first light splitting sheet (7).

5. The compact vehicle-mounted DLP projection system according to claim 4, wherein a cylindrical lens (9) and a field lens (11) are sequentially arranged between the second light splitting sheet (8) and the display chip (12),

the cylindrical lens (9) is adapted to converge the light passing through the second light-splitting sheet (8) in the x-direction, unchanged in the y-direction;

the field lens (11) is suitable for receiving and refracting the light converged by the cylindrical lens (9) and forming an illumination light spot on the display chip (12), and the field lens (11) is suitable for converging the light reflected by the display chip (12) so as to reduce the height of the light.

6. The compact vehicle-mounted DLP projection system of claim 1, wherein a plurality of microlenses are provided on the display chip (12), the plurality of microlenses being adapted to be turned on or off to enable reflection of the illumination spots impinging thereon into the projection lens group (13) via the plurality of microlenses in an on state to achieve corresponding pixel projection.

7. The compact vehicle-mounted DLP projection system of claim 5, wherein an included angle between the field lens (11) and the display chip (12) in the y-axis is 18 ° to 24 °, an included angle between the reflecting mirror and the y-axis is 50 ° to 60 °, and the projection lens group (13) is arranged perpendicular to the x-axis.

8. The compact vehicle-mounted DLP projection system of any of claims 1 to 7, wherein the F-number of the projection lens group (13) is between 2.0 and 3.0.

9. The compact vehicle-mounted DLP projection system of claim 5, wherein the cylindrical lenses (9) have different curvatures in the x-axis, y-axis directions, wherein one face of the cylindrical lenses (9) is a plane and the radius of curvature of the other face in the x-direction is 15-23 mm.

10. A vehicle employing the compact on-board DLP projection system of any one of claims 1 to 9.