CN114236956A

CN114236956A - Color projection system and color projection method

Info

Publication number: CN114236956A
Application number: CN202010940723.5A
Authority: CN
Inventors: 李�浩; 郎海涛; 荣文秀; 张恩鑫; 杨佳
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2020-09-09
Filing date: 2020-09-09
Publication date: 2022-03-25

Abstract

The present application provides a color projection system and method. The color projection system includes: a monochromatic array light source; the modulation module is used for focusing the light beams emitted by the monochromatic array light source into a light spot array; the color modulation module is used for modulating the color of the light rays transmitted by the modulation module to obtain color-modulated light rays; and the projection lens group is used for receiving the color light rays and forming a color image of the light spot array.

Description

Color projection system and color projection method

Technical Field

The present disclosure relates to the field of projectors, and more particularly, to a color projection system and a color projection method.

Background

Conventional automotive lights can only provide a lighting function. With the continuous development of new technologies such as intelligent cities, intelligent transportation, automated driving and the like, the functions of automobiles are continuously upgraded, and the functions of automobile lamps are also enriched.

Smart vehicle lights are typically manufactured by combining traditional lighting functions with projection functions. Specifically, for example, a welcome lamp, a projection brake lamp, an internal atmosphere lamp, or an intelligent headlight is manufactured. The intelligent car light can project the figure with the shape by modifying and designing the light source and the light path. For example, a vehicle lamp using Micro LED technology, because the Micro LED chip includes a large number of pixel units arranged in an array, the size and shape of the illuminated area and the closed area can be finely controlled. The car light can project various shapes of patterns. For example, when the vehicle turns, a turning arrow is projected to the road surface, and various signs such as speed limit speed are projected in a speed limit area. Along with the continuous variety of operation requirements of people, the intelligent car lamp still needs to be continuously upgraded. For example, it is desirable to project a colorful vivid pattern.

Some Projection Graphics Units (PGUs) are available to implement color Projection. But the solution is often too complicated and elaborate and the production costs are also high.

Some existing color projection schemes including intelligent car lamps and PGUs need to be provided with a three-color light source circuit and an electric control board, are complex in structure, and have unsatisfactory aspects such as heat dissipation and power consumption.

Disclosure of Invention

Embodiments of the present application provide a color projection system, comprising: a monochromatic array light source; the modulation module is used for focusing the light beams emitted by the monochromatic array light source into a light spot array; the color modulation module is used for modulating the color of the light rays transmitted by the modulation module to obtain color-modulated light rays; and the projection lens group is used for receiving the color light rays and forming a color image of the light spot array.

In one embodiment, a monochromatic array light source includes a plurality of monochromatic pixel light sources forming an array; each spot in the array of spots corresponds to a monochromatic pixel light source.

In one embodiment, the monochromatic array light source comprises a monochromatic laser array light source or a blue LED Matrix light source.

In one embodiment, the modulation module is a modulation lens group or a micro-lens modulation array.

In one embodiment, the tinting module has at least three tinting states, and the resulting tinted light has mutually different colors in different tinting states.

In one embodiment, the color modulation module comprises a color wheel, an axis of the color wheel is positioned outside an exit light path of the modulation module, and the color wheel can rotate based on the axis; the color wheel comprises at least three mutually different color mixing parts distributed in the annular area, and the color mixing parts are used for mixing colors of the light rays transmitted by the modulation module.

In one embodiment, the at least three toning portions include a blue toning portion, a red toning portion, and a green toning portion.

In one embodiment, the color wheel is a transmissive color wheel or a reflective color wheel.

In one embodiment, when the color modulation module comprises a reflective color wheel, the modulation module is a modulation lens group; the principal ray of the light beam emitted by the monochromatic array light source inclines relative to the optical axis of the modulation lens group, so that the focusing plane where the light spot array focused by the modulation lens group is positioned inclines relative to the optical axis of the modulation lens group; the reflecting surface of the reflective color wheel is positioned at the focusing plane where the light spot array is positioned.

In one embodiment, the color projection system further comprises a processing module communicatively coupled to the monochrome array light source and the color tuning module for controlling a lighting state of the monochrome array light source and a color tuning state of the color tuning module.

In one embodiment, the entrance face of the color modulation module is located at the array of light spots or at a side of the array of light spots facing away from the modulation module.

In an exemplary embodiment, the modulation module has a focal plane relative to the monochromatic array light sources; the incidence surface of the color modulation module is positioned on one side of the focusing plane facing the modulation module.

In a second aspect, embodiments of the present application provide a color projection method, including: generating a light beam by a plurality of monochromatic pixel light sources forming an array; focusing the light beams into a light spot array through a modulation module; the color modulation module modulates the light emitted by the modulation module to obtain color-modulated light; a color image of the spot array is formed based on the toned light.

In one embodiment, the monochromatic pixel light sources are LED light sources or laser light sources.

In one embodiment, the modulation module has a focal plane relative to the monochromatic array light sources; the incidence surface of the color modulation module is positioned on one side of the focusing plane facing the modulation module.

In one embodiment, each spot in the array of spots corresponds to a monochromatic pixel light source.

In one embodiment, the method further comprises: the processing module sends a first color matching signal to the color matching module; in response to the first toning signal, the processing module sends a first light emitting signal to a plurality of monochromatic pixel light sources forming an array.

The color projection system provided by the embodiment of the application can realize illumination and projection, and can realize color projection of various patterns. The monochromatic array light source simplifies the design scheme of the light source circuit and the electric control board, simplifies the light path, increases the utilization rate of the light source, reduces the heat dissipation pressure, and is matched with the color mixing module to realize color projection. The structure is also simplified by the matching of the modulation module and the projection lens group, and a good projection effect is realized.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

FIG. 1 shows a schematic block diagram of a color projection system according to a first embodiment of the present application;

FIG. 2 shows a schematic block diagram of a color projection system according to a third embodiment of the present application;

FIG. 3 shows a schematic block diagram of a color projection system according to a fourth embodiment of the present application;

FIG. 4 shows a schematic block diagram of a color projection system according to an embodiment of the present application;

FIG. 5 shows an equivalent optical path diagram of the microlens array of FIG. 4;

FIG. 6 shows a schematic block diagram of a color projection system according to an embodiment six of the present application;

FIG. 7 shows a schematic block diagram of a color projection system according to an embodiment of the present application;

FIG. 8 is a schematic block diagram of a color projection system according to an eighth embodiment of the present application; and

fig. 9 shows a schematic flow chart of a color projection method according to an embodiment of the application.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, a first ommatidium discussed below may also be referred to as a second ommatidium without departing from the teachings of the present application. And vice versa.

In the drawings, the thickness, size and shape of the components have been slightly adjusted for convenience of explanation. The figures are purely diagrammatic and not drawn to scale. For example, the size and distance of the projection lens group and the color wheel are not in proportion to actual production. As used herein, the terms "approximately", "about" and the like are used as table-approximating terms and not as table-degree terms, and are intended to account for inherent deviations in measured or calculated values that would be recognized by one of ordinary skill in the art.

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including engineering and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. In addition, unless explicitly defined or contradicted by context, the specific steps included in the methods described herein are not necessarily limited to the order described, but can be performed in any order or in parallel. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The color projection system provided by the embodiment of the application comprises: the device comprises a monochromatic array light source, a modulation module, a color modulation module and a projection lens group. The color projection system may be a separate device, such as a projector. Or may be a device mounted to another apparatus. Such as smart car lights mounted to a car.

A monochromatic array light source may include a plurality of monochromatic pixel light sources forming an array. These monochromatic pixel light sources may be integrated on-chip. Each monochromatic pixel light source is independently controlled to emit or extinguish. The array of monochromatic pixel light sources may be a regular two-dimensional matrix, and may be arranged concentrically, or in other forms. The arrangement mode of the monochromatic pixel light sources can affect the circuit arrangement, the heat dissipation effect and the like, so that the design can be adaptively carried out according to the actual use environment.

The light emitted by the monochromatic array light source can be blue light or other monochromatic light, and the pattern information is carried in the emitted light. Specifically, some monochromatic pixel light sources emit light, while others do not. The positional relationship between these two types of monochrome pixel cells can be considered as the pixel information of the pattern.

The modulation module is arranged on one side of the monochromatic array light source, which emits the light beams, and is used for focusing the light beams emitted by the monochromatic array light source into a light spot array. The monochromatic array light source has a divergence angle, when light emitted by the monochromatic array light source is directly projected to the color modulation module, a large spot area is correspondingly formed on the color modulation module by the monochromatic pixel unit, and adjacent spot areas can be overlapped, so that an image is completely distorted. The modulation module forms a light spot array with good image quality by focusing light emitted by the monochromatic array light source to a plane, thereby avoiding image blurring and distortion.

Illustratively, each light spot in the array of light spots corresponds to a monochromatic pixel light source. Since the light rays emitted by each monochromatic pixel light source may be divergent, the light rays emitted by different monochromatic pixel light sources may also interact during transmission. However, when the light emitted from the monochromatic array light source passes through the modulation module, the light is focused. The light from each monochromatic pixel source can be focused into a spot, influenced by the initial direction of travel of the light from the monochromatic array source. The plurality of light spots may be spatially arranged in an array of light spots. Of course, these light spots will continue to transmit and scatter as many light rays during transmission. Understandably, the array of light spots constitutes the projected image.

The color modulation module is used for modulating colors of the light rays transmitted by the modulation module to obtain color-modulated light rays. The monochromatic light emitted by the monochromatic array light source is changed in the transmission path after passing through the modulation module, but is still monochromatic light. At least one part of the color modulation module is positioned in an emergent light path of the modulation module, so that light rays transmitted by the modulation module can irradiate the color modulation module, and then the light rays are subjected to color modulation by the color modulation module.

In an exemplary embodiment, the tinting module has at least three tinting states, the resulting tinted light having mutually different colors in different tinting states. Therefore, the light transmitted by the color-adjusting module can have rich colors. And generally speaking, the graphics information carried in these rays is not distorted by variations.

And the projection lens group is used for receiving the light rays subjected to color modulation by the color modulation module and forming an image of the light spot array. The image source side of the projection lens group faces the color mixing module, and light transmitted by the color mixing module enters the projection lens group and forms an image on the projection side of the projection lens group. The image is typically a toned magnified image of the array of light spots. The image is a toned image formed by a monochromatic pixel light source emitting light at a certain time, and is usually magnified, and may be an inverted image or a positive image. Color projection systems typically operate to form color images, but can still be used to form monochromatic images.

In an exemplary embodiment, the color projection system further comprises a processing module communicatively coupled to the monochrome array light source and the color tuning module for controlling a lighting state of the monochrome array light source and a color tuning state of the color tuning module. The lighting state of the monochromatic array light source and the color modulation state of the color modulation module generally need to be matched. So as to ensure that the image at the final projection position is matched with the color, thereby achieving the preset projection effect.

A part of monochromatic pixel light sources in the monochromatic array light source emit light, the color adjusting module adjusts the light rays to be in a first color, and then a part of monochromatic pixel light sources in the monochromatic array light source can be changed to emit light, and the color adjusting module can adjust the light rays to be in a second color. Meanwhile, a part of the monochromatic pixel light sources in the monochromatic array light source can continuously emit light, the light emitted first is adjusted to be the first color, and the light emitted later is adjusted to be the second color. Color projection systems project an image at any time. However, for the user, images that the color projection system may make over a period of time (e.g., 1/24 seconds) are "seen" as an image due to the temporal effects of the human eye. The image may have complex graphics and rich colors, but may also be monochrome.

The utility model provides a color projection system, illumination function and projection function have simultaneously, utilize monochromatic array light source to realize the color projection moreover, every pixel corresponds only a monochromatic pixel light source, it has three light sources to compare every pixel correspondence among the current color projector, can reduce the quantity of the light source that disposes to a great extent, and then reduced the radiating pressure of light source department, and reduced the pressure of arranging of light source department components and parts, the circuit drive design has still been simplified, and then reduced the risk of crosstalk, make the formation of image more accurate. And the light path of the color projection system is simplified, and the utilization rate of the light source is higher.

In an exemplary embodiment, the monochromatic array light source includes a monochromatic laser array light source or a blue LED Matrix light source. The monochromatic laser array light source has high brightness, good light effect and no speckle trouble. The blue LED Matrix light source has long service life and better consistency.

In an exemplary embodiment, the modulation module is a modulation lens group or a micro-lens modulation array. The modulation lens group has simple structure and is convenient to manufacture. The light transmitted by the micro-lens modulation array is more uniform. Generally, the image formed by the system with the modulation lens group is reverse image relative to the monochromatic array light source, and the image formed by the system with the micro lens modulation array is positive image relative to the monochromatic array light source. The reason is that the modulation lens group modulates the entire array surface of the monochromatic array light source, and the micro lens modulation unit can modulate for each monochromatic pixel light source. Illustratively, the number of lenses having power in the modulation lens group is not less than two. Illustratively, the number of small eyes in the microlens modulation array matches the number of monochromatic pixel light sources in the monochromatic array light sources. Illustratively, the locations of the ommatidium and the monochromatic pixel light sources match.

In an exemplary embodiment, the color-tuning module includes a color wheel, and the axis of the color wheel may be located outside the exit light path of the modulation module and a portion of the color wheel is located within the exit light path of the modulation module. And the color wheel can rotate around the axis, and further the color wheel is provided with a ring-shaped area based on the axis, and the ring-shaped area is circularly intersected with the emergent light path of the modulation module. The color wheel comprises at least three mutually different color mixing parts which are distributed along the axial direction of the axis. When the color wheel rotates along the axis, the color mixing parts are switchably arranged in the emergent light path of the modulation module, and the color mixing parts are used for mixing colors of the light rays transmitted by the modulation module.

Generally, the color wheel is coaxially connected with a rotating shaft of a motor, and the electrode can drive the color wheel to rotate. Illustratively, three toning portions are provided along a ring shape to the color wheel. If there are only three toning portions, the three toning portions may be connected end to end. More toning portions may also be provided along the ring shape. Along with the rotation of the color wheel, the position of the color mixing part also rotates, different color mixing parts can be positioned in the emergent light path of the modulation module at different moments, and the color mixing part mixes colors of light transmitted by the modulation module at the moment. When one color matching part is in the emergent light path of the modulation module, the color matching module can be considered to be in a corresponding color matching state.

In an exemplary embodiment, the at least three toning portions include a blue toning portion, a red toning portion, and a green toning portion. Illustratively, more blue toning portions, red toning portions, and green toning portions may be included, which are alternately disposed in the ring-shaped area of the color wheel. Illustratively, when the green toning part is in the outgoing light path of the modulation module, the toning module is considered to be in a green toning state. Illustratively, other color toning portions may also be included.

In an exemplary embodiment, the color wheel is a transmissive color wheel or a reflective color wheel. The incident direction and the emergent direction of the transmission color wheel are arranged on the two sides of the transmission color wheel, and light rays are transmitted through the color wheel. The incident direction and the emergent direction of the reflective color wheel are at different angles on the same side. The light is reflected at the color wheel. The two color wheels have different light paths and are suitable for different installation environments. Illustratively, the color tuning module includes a phosphor color wheel, such as a transmissive phosphor color wheel or a reflective phosphor color wheel.

For example, the toning module may also include other types of position-switchable toning portions. Such as a color matching section arranged in a roll, etc. For example, the area of each color-mixing part in the cross section of the light propagation direction is generally not less than the cross section of the emergent light path of the modulation module after all the monochromatic array light sources emit light.

In an exemplary embodiment, the entrance face of the color-tuning module is located at the array of light spots. The focusing plane of the monochromatic array light source is superposed with the incident plane of the color mixing module, so that the clear image plane of the array light source is completely corresponding to the surface of the color mixing module, and the image blurring distortion is avoided.

Illustratively, the color modulation module is located at a side of the array of light spots facing away from the modulation module. The light transmitted by the modulation module is focused and then dispersed. The color modulation module is arranged on the side of the light spot array, so that the light path of the focused light spot can be prevented from being influenced, and the light spot is ensured to be well focused and formed. Then the divergent light rays when the light spot array continues to transmit can be color-mixed by the color mixing module.

Illustratively, the color modulation module is a transmissive color modulation module, which is located on a side of the light spot array facing the modulation module, and the arrangement is such that the structure of the color projection system provided by the present application is small.

Illustratively, the modulation module has a focal plane that is opposite to the monochromatic array light source. The image source plane of the projection module may be disposed at the focal plane. The color modulation module may be a reflective color modulation module, the incident surface of which is located on the side of the focus plane facing the modulation module. When the color tuning module is a reflective color tuning module and is located in front of the focal plane, it is actually a virtual image of the array of light spots at the focal plane. The actual light spot is still located on the side of the reflective toning module facing the modulation module.

Several embodiments provided by the present application are described in detail below with reference to fig. 1 to 8.

Example one

Referring to fig. 1, the color projection system of the present embodiment includes: the device comprises a monochromatic laser array light source 1, a modulation lens group 2, a transmission type fluorescent powder color wheel 3 and a projection lens group 4.

The color projection system in fig. 1 is a view of the projection angle, where the visible side of the monochromatic laser array light source 1 is the right side and the invisible side is the left side. The visible side of the transmissive phosphor color wheel 3 is the left side and the invisible side is the right side. The visible side of the projection lens group 4 is also the left side.

The monochromatic laser array light source 1 has good monochromaticity and small divergence angle of emitted light. The right side of which is provided with an array of monochromatic pixel light sources for forming light with pattern information. The monochromatic pixel light sources are controlled to be turned on and off relatively independently, for example, one monochromatic pixel light source emits a first marginal ray L11 and a second marginal ray L12 after being turned on.

The modulation lens group 2 is disposed in the emission direction of the monochromatic laser array light source 1. Exemplarily, the modulation lens group 2 includes two lenses of positive power, and fig. 1 is a front view of the modulation lens group 2 partially cut away. The first edge light L11 and the second edge light L12 are affected by the modulation lens group 2 to change the optical path, and are finally focused to a light spot P1 at the image source surface S1. While the light at point P1 continues to travel to the right.

The incident direction of the transmissive phosphor color wheel 3 is toward the left side, and the emitting direction is toward the right side. It includes a green toning portion S2, a red toning portion S3, and a blue toning portion S4. The green toning part S2 is in the outgoing light path of the modulation lens group 2 in the figure, and can tone light. Specifically, the incident surface of the transmissive phosphor color wheel 3 coincides with the image source surface S1. The transmissive phosphor color wheel 3 may have a smaller diameter that rotates along an axis, the direction of rotation being clockwise as shown.

The projection lens assembly 4 is disposed on the right side of the transmissive phosphor color wheel 3. The left side of the projection lens group 4 is its image source side and the right side is its projection side. The light transmitted by the transmissive phosphor color wheel 3 enters the projection lens assembly 4 from the image source side of the projection lens assembly 4, and finally forms an image on the right side of the projection lens assembly 4.

Illustratively, the color projection system further comprises a processing module (not shown) communicatively connected to the monochromatic laser array light source 1 and the color modulation module, wherein the color modulation module comprises a transmissive phosphor color wheel 3 and a motor. The processing module controls the light emitting state of the monochromatic laser array light source 1 and the color mixing state of the color mixing module. Specifically, the light emitting frequency of the monochromatic pixel light source can be controlled, and the transmissive phosphor color wheel 3 is modulated in a time division multiplexing mode, so that clear color projection can be realized, and pattern projection of various shapes can be performed according to requirements.

Example two

Referring to the first embodiment, the color projection system of this embodiment includes: the device comprises a blue LED Matrix light source, a modulation lens group 2, a color mixing module, a projection lens group 4 and a processing module. The modulation lens assembly 2, the color modulation module, the projection lens assembly 4 and the processing module are the same as those in the first embodiment. The blue LED Matrix light source has high resolution and low cost. The final projection of the system provided by the embodiment is finer.

EXAMPLE III

Referring to fig. 2, the color projection system of the present embodiment includes: the device comprises a blue LED Matrix light source 1, a modulation lens group 2, a transmission type fluorescent powder color wheel 3 and a projection lens group 4.

The color projection system in fig. 2 is a view of the projection angle, where the side where the blue LED Matrix light source 1 is visible is the right side. The visible side of the transmissive phosphor color wheel 3 is the left side, as is the visible side of the projection lens group 4.

The right side surface of the blue LED Matrix light source 1 is provided with a plurality of monochromatic pixel light sources of an array, and specifically may be a plurality of blue LED light sources. Each blue LED is controlled to be turned on and off relatively independently for emitting light with pattern information. For example, a blue LED light source emits a first edge light L11 and a second edge light L12 when turned on.

The modulation lens group 2 is disposed in the emitting direction of the blue LED Matrix light source 1. Exemplarily, the modulation lens group 2 includes two lenses of positive power, and the modulation lens group 2 is partially cut away in a front view direction in fig. 2. The first edge light L11 and the second edge light L12 are affected by the modulation lens group 2 to change the optical path, and are finally focused to a light spot P1 at the image source surface S1. While the light at point P1 continues to travel to the right.

The incident direction of the transmissive phosphor color wheel 3 is toward the left side, and the emitting direction is toward the right side. It includes a green toning portion S2, a red toning portion S3, and a blue toning portion S4. The green toning part S2 is in the outgoing light path of the modulation lens group 2 in the figure, and can tone light. The incident surface projected to the phosphor color wheel 3 may be located on the left side of the image source surface S1. Further, the projection lens group 4 may be configured to be closer to the image source surface S1.

Illustratively, the color projection system further comprises a processing module. The processing module can control the light emitting frequency of each LED in the blue LED Matrix light source 1, and modulate the transmission type fluorescent powder color wheel 3 by utilizing a time division multiplexing mode, so that good color projection can be realized.

Example four

Referring to fig. 3, the color projection system provided in this embodiment includes a blue LED Matrix light source 1, a modulation lens assembly 2, a transmissive phosphor color wheel 3, a projection lens assembly 4, and a processing module. The blue LED Matrix light source 1, the modulation lens assembly 2, the projection lens assembly 4 and the processing module may be the same as those in the third embodiment.

In this embodiment, the transmissive phosphor color wheel 3 is located at the right side of the image source surface S1. The color projection system provided by the embodiment can be suitable for equipment with different installation requirements.

EXAMPLE five

Referring to fig. 4 and 5, the color projection system of the present embodiment includes: the device comprises a blue LED Matrix light source 1, a micro-lens modulation array 2, a transmission type fluorescent powder color wheel 3 and a projection lens group 4.

The color projection system in fig. 4 is a view of a projection angle in which the side of the blue LED Matrix light source 1 that is visible is the right side, and the visible side of the microlens modulation array 2 is also the right side. The visible side of the transmissive phosphor color wheel 3 is the left side, as is the visible side of the projection lens group 4.

The right side surface of the blue LED Matrix light source 1 is provided with a plurality of monochromatic pixel light sources of an array, and specifically may be a plurality of blue LED light sources. Each blue LED is controlled to be turned on and off relatively independently for generating light having pattern information.

The micro lens modulation array 2 is arranged in the emitting direction of the blue LED Matrix light source 1. Illustratively, the small eyes on two sides of the micro-lens modulation array 2 correspond one to one, and each pair of small eyes corresponds to one LED of the blue LED Matrix light source 1. The light emitted from the blue LED Matrix light source 1 is affected by the collimating and focusing lens assembly 2 to change the light path, and is finally focused to a light spot at the image source surface S1, and the light at the light spot still continues to be transmitted to the right. Referring to fig. 5, a pair of small eyes of the microlens modulation array 2 may be equivalent to the first small eye 21 and the second small eye 22 shown in fig. 5. The light rays incident from the incident direction pass through the first and second small eyes 21 and 22 and are focused into a light spot at the image source surface S1.

The incident direction of the transmissive phosphor color wheel 3 is toward the left side, and the emitting direction is toward the right side. It includes a green toning portion S2, a red toning portion S3, and a blue toning portion S4. The green toning part S2 is in the outgoing light path of the modulation lens group 2 in the figure, and can tone light.

EXAMPLE six

Referring to fig. 6, the color projection system of the present embodiment includes: the device comprises a monochromatic array light source 1, a modulation lens group 2, a reflective fluorescent powder color wheel 3 and a projection lens group 4.

The color projection system in fig. 6 is a view of the projection angle, where the side where the monochromatic array light source 1 is visible is the right side. The modulation lens group 2 is partially sectioned in the front view direction in fig. 2. The visible side of the reflective phosphor color wheel 3 is the left side. The visible side of the projection lens group 4 is the side on the image source side, and the invisible side is the side on the projection side.

The right side surface of the monochromatic array light source 1 is provided with a plurality of monochromatic pixel light sources in an array, each of which is controlled to be turned on and off relatively independently.

The modulation lens group 2 is arranged in the emergent direction of the monochromatic array light source 1. Illustratively, the modulation lens group 2 includes two lenses with positive power, and the light emitted from the monochromatic array light source 1 is affected by the modulation lens group 2 to change the optical path and finally focused into a light spot array at a focusing plane S1 (which can also be regarded as an image source surface of the projection lens group 4) of the modulation lens group 2 opposite to the monochromatic array light source 1, for example, the light emitted from one monochromatic pixel light source can be focused into a light spot P1. While the light at point P1 continues to travel to the right.

The normal line of the light-receiving surface (corresponding to the incident surface) of the reflective color wheel 3 is directed to the upper left side, the incident direction is directed to the left side, and the emission direction is directed to the substantially upper side. It includes a green toning portion S2, a red toning portion S3, and a blue toning portion S4. The green toning part S2 is in the outgoing light path of the modulation lens group 2 in the figure, and can tone light.

The projection lens assembly 4 is disposed on the upper left side of the reflective phosphor color wheel 3. The lower side of the projection lens group 4 is the image source side thereof, and the upper side is the projection side thereof. The light reflected by the reflective color wheel 3 enters the projection lens assembly 4 from the image source side of the projection lens assembly 4, and finally forms an image on the upper side of the projection lens assembly 4.

Illustratively, the color projection system further comprises a processing module. The processing module can control the light-emitting frequency of each monochromatic pixel light source in the monochromatic array light source 1, and modulate the reflective fluorescent powder color wheel 3 by using a time division multiplexing mode, so that good color projection can be realized.

EXAMPLE seven

Referring to fig. 7, the color projection system of the present embodiment includes: the device comprises a monochromatic array light source 1, a modulation lens group 2, a reflective fluorescent powder color wheel 3 and a projection lens group 4. The modulation lens assembly 2, the reflective phosphor color wheel 3 and the projection lens assembly 4 of this embodiment can be configured as described in the sixth embodiment.

The principal ray direction of the monochromatic array light source 1 is obliquely arranged relative to the optical axis of the modulation module 2. So that the light emitted by the monochromatic array light source 1 is focused on the image source surface S1 after passing through the modulation lens group 2. The image source surface S1 is located at the reflective surface of the reflective phosphor color wheel.

Example eight

Referring to fig. 8, the color projection system of the present embodiment includes: the device comprises a monochromatic array light source 1, a micro-lens modulation array 2, a reflective fluorescent powder color wheel 3 and a projection lens group 4.

The monochromatic array light source 1, the reflective phosphor color wheel 3 and the projection lens group 4 may be the same as in the sixth embodiment.

The micro-lens modulation array 2 is used for modulating the light emitted from the monochromatic array light source 1 and focusing the light emitted from the monochromatic array light source 1 on the focusing surface S1. The focusing surface S1 is parallel to the light-facing surface of the reflective phosphor color wheel 3.

The color projection system provided by the embodiment has a compact structure and clear projection patterns.

Referring to fig. 9, an embodiment of the present application further provides a color projection method, including the following steps:

s1010, light beams are generated by a plurality of monochromatic pixel light sources forming an array.

And S1020, focusing the light beams into a light spot array through the modulation module.

And S1030, carrying out color modulation on the light emitted by the modulation module through the color modulation module to obtain color-modulated light.

S1040, forming a color image of the light spot array based on the color-adjusted light rays.

The method may be implemented by a color projection system as described above. The method can utilize a monochromatic light source to form color projection, and has the advantages of simple light path structure, high light source utilization rate and low energy consumption.

In an exemplary embodiment, the monochromatic pixel light source is an LED light source or a laser light source.

In an exemplary embodiment, the color tuning module is located in the scattering direction of the array of light spots. The beam continues to propagate after being focused into an array of spots. Each light spot scatters light rays, and the color matching module is used for matching colors of the light rays.

In an exemplary embodiment, each spot in the array of spots corresponds to a monochromatic pixel light source.

In an exemplary embodiment, the method further comprises, prior to S1010:

s1001, the processing module sends a first color matching signal to the color matching module.

And S1002, responding to the first light-emitting signal, the processing module sends the first light-emitting signal to a plurality of single-color pixel light sources forming an array.

The processing module can send out a plurality of luminous signals and a plurality of toning signals. Illustratively, the color-mixing state of the color-mixing module is switched circularly with a stable frequency, so that when the color-mixing module works, only a corresponding light-emitting signal needs to be sent out.

Illustratively, S1010, in response to the light emitting signal, a part of the plurality of monochromatic pixel light sources forming the array emits light to generate a light beam.

The above description is only a preferred embodiment of the present application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of protection covered by the present application is not limited to the embodiments with a specific combination of the features described above, but also covers other embodiments with any combination of the features described above or their equivalents without departing from the technical idea described above. For example, the above features and (but not limited to) features having similar functions in this application are mutually replaced to form the technical solution.

Claims

1. A color projection system, comprising:

a monochromatic array light source;

the modulation module is used for focusing the light beams emitted by the monochromatic array light source into a light spot array;

the color modulation module is used for modulating colors of the light rays transmitted by the modulation module to obtain color-modulated light rays; and

and the projection lens group is used for receiving the color light rays and forming a color image of the light spot array.

2. The color projection system of claim 1 wherein the monochromatic array light source comprises a plurality of monochromatic pixel light sources forming an array;

each light spot in the array of light spots corresponds to one of the monochromatic pixel light sources.

3. The color projection system of claim 1, wherein the monochromatic array light source comprises a monochromatic laser array light source or a blue LED Matrix light source.

4. The color projection system of claim 1, wherein the modulation module is a modulation lens group or a micro-lens modulation array.

5. The color projection system of claim 1, wherein the toning module has three toning states, the resulting toned light rays having mutually different colors in different toning states.

6. The color projection system of claim 1 or 5 wherein the color tuning module comprises a color wheel having an axis outside of the exit light path of the modulation module and rotatable based on the axis, the color wheel having a ring-shaped region based on the axis intersecting the exit light path of the modulation module;

the color wheel comprises at least three mutually different color mixing parts distributed in the annular area, and the color mixing parts are used for mixing colors of the light rays transmitted by the modulation module.

7. The color projection system of claim 6, wherein the at least three toning portions include a blue toning portion, a red toning portion, and a green toning portion.

8. The color projection system of claim 6 wherein the color wheel is a transmissive color wheel or a reflective color wheel.

9. The color projection system of claim 8 wherein when the color tuning module comprises a reflective color wheel, the modulation module is a modulation lens group;

the principal ray of the light beam emitted by the monochromatic array light source inclines relative to the optical axis of the modulation lens group, so that the focusing plane where the light spot array is focused by the modulation lens group inclines relative to the optical axis of the modulation lens group;

the reflecting surface of the reflective color wheel is located at the focusing plane where the array of light spots is located.

10. A color projection method, comprising:

generating a light beam by a plurality of monochromatic pixel light sources forming an array;

focusing the light beams into an array of light spots by a modulation module;

the light emitted by the modulation module is modulated by a color modulation module to obtain color-modulated light;

forming a color image of the array of light spots based on the color-adjusting light rays.