CN117008404A - Projection system - Google Patents

Abstract

The application discloses a projection system, which comprises a color mixing light source module, a light modulation module, a collimation module, a beam combination module, a dodging module and an imaging module; the system comprises a light source module, a beam combining module, a beam homogenizing module, a beam combining module, a beam-mixing module and a color-mixing light source module, wherein the light source module is used for providing three primary color LED light rays and yellow laser light rays, the three primary color LED light rays and the yellow laser light rays are subjected to collimation treatment, the beam combining module is used for combining the three primary color LED light rays and the yellow laser light rays to form the color-mixing light rays, the color-mixing light rays are subjected to dodging and shaping treatment through the light homogenizing module, projection light rays are obtained for projection, the problem that the three primary color LED light rays cannot fully traverse a yellow part is solved by utilizing the yellow laser light rays in the system, the problem of poor color rendering capability of the projection system is solved, and meanwhile, only one laser light ray is adopted in the system, and the problem of large heat dissipation caused by the fact that all laser light sources are adopted as working light rays is avoided.

Description

a projection system

Technical field

The present invention relates to the field of optical optoelectronics technology, and more specifically to a projection system.

Background technique

The projection system is an optical system that illuminates objects and images them on the projection screen. The ultimate goal of the projection system is to truly reproduce the colors and various scenes in nature that the human eye can see. It is mainly divided into three types according to different light sources: bulb, LED (Light-Emitting Diode, light-emitting diode) and laser projection. With the development of display technology, projection technology using LED and laser as light sources stands out. However, current projection systems using LEDs or lasers as light sources have problems with poor color rendering capabilities or large heat dissipation.

Contents of the invention

In view of this, the present invention provides a projection system to solve the problem of poor color rendering ability or large heat dissipation of the projection system.

In order to achieve the above objects, the present invention adopts the following technical solutions:

A projection system, characterized in that it includes: a mixed color light source module, a light modulation module, a collimation module, a beam combining module, an even light module and an imaging module; wherein the mixed color light source module includes an LED light source unit and a laser light source unit, Used to emit LED light and yellow laser light; the light modulation module includes: a circuit board and a first signal controller, used to carry, regulate and control the LED light source unit and laser light source unit; the collimation module includes a collimator The straight element is used to collimate the LED light and the laser light; the beam combining module includes a beam combining element and a reflective element, used to combine the three primary color LED light and the yellow laser light, and combine the mixed color light Compress or fold the light path; the light uniformity module includes a light uniformity element and a relay lens, used to uniformly light and shape the mixed color light to obtain projection light; the imaging module includes: a spatial light modulator and a second signal controller to obtain a projected image based on the projected light rays.

Preferably, the LED light source unit includes a plurality of LEDs, and the plurality of LEDs include at least a first LED, a second LED and a third LED, wherein the first LED is used to emit red light, and the second LED The LED is used to emit green light, and the third LED is used to emit blue light;

Preferably, the beam combining element includes a first beam combining element and a second beam combining element; the first beam combining element is disposed on a common optical path of the first LED, the second LED and the third LED, and the The first beam combining element is used to combine the red light, the green light and the blue light to obtain three primary color mixed light and transmit it along the first direction; the second beam combining element is arranged on the first In the first direction of the beam combining element, the second beam combining element is used to combine the three primary color mixed light and the yellow laser light to obtain the mixed color light and transmit it along the first direction.

Preferably, the reflective element is arranged in the first direction of the second beam combining element, and the reflective element is used to reflect the mixed color light to the second direction, and the first direction and the second direction In the same plane, the first direction intersects the second direction.

Preferably, the second signal controller is configured to transmit a modulation signal to the spatial light modulator, so that the spatial light modulator outputs a projection image based on the modulation signal.

It can be seen from the above technical solution that compared with the prior art, the present invention provides a projection system, which includes a mixed color light source module, a light modulation module, a collimation module, a beam combining module, and a uniform light module. modules and imaging modules. Among them, the mixed color light source module is used to provide three primary color LED light and yellow laser light. The three primary color LED light and yellow laser light are combined by the beam combining module to form mixed color light. The mixed color light is obtained after being uniformed and shaped by the uniform light module. Projection light is used for projection. In this system, yellow laser light is used to make up for the problem that the three primary color LED lights cannot fully traverse the yellow part, solving the problem of poor color rendering ability of the projection system. At the same time, only one kind of laser light is used in this system, which avoids All laser light sources are used as working light, which leads to the problem of large heat dissipation.

This projection system makes full use of the advantages of LED's small size and low cost and laser's high brightness, high saturation, and large display color gamut. Under the conditions of low cost and small volume, a projection with higher brightness and larger color gamut is obtained. system; and this projection system eliminates the necessary color wheel in the laser fluorescence projection system, further reduces the size, makes the system static, and eliminates the impact of the high-speed rotation of the color wheel.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the provided drawings without exerting creative efforts.

Figure 1 is a schematic module diagram of a projection system provided by the present invention;

Figure 2 is a schematic diagram of the internal structure of a projection system provided by the present invention;

Figure 3 is a schematic diagram 2 of the internal structure of a projection system provided by the present invention;

Figure 4 is a schematic spectrum diagram of the first LED, the second LED and the third LED of a projection system of the present invention;

Figure 5 is a schematic spectrum diagram of a mixed-color light source module of a projection system of the present invention;

Figure 6 is a schematic spectrum diagram 2 of a mixed-color light source module of a projection system according to the present invention;

Figure 7 is a schematic diagram 1 of the reflection spectrum of the second beam combining element of a projection system of the present invention;

Figure 8 is a schematic diagram of the spectrum of laser light and LED light after they are coaxially combined by the second beam combining element;

Figure 9 is a schematic diagram 2 of the reflection spectrum of the second beam combining element of a projection system of the present invention;

Figure 10 is a schematic diagram 2 of the spectrum of laser light and LED light after they are coaxially combined by the second beam combining element;

In the picture: 100. Mixed color light source module, 200. Beam combining module, 300. Uniform light module, 10. LED, 11. Laser, 12. Circuit board, 13. First signal controller, 21. First beam combining component, 22. Second beam combining element, 23. Reflective element, 31. Light uniformity element, 32. Relay lens, 41. Collimation element, 42. Collimation element, 51. Spatial light modulator, 52 Second signal controller .

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Referring to Figures 1-10, an embodiment of the present invention discloses a projection system, including: a mixed color light source module, a light modulation module, a collimation module, a beam combining module, an even light module and an imaging module; wherein,

The mixed color light source module is used to provide three primary color LED light and yellow laser light;

The collimation module is used to collimate the light emitted by the LED and laser;

The beam combining module is used to combine the three primary color LED lights into a first combined light beam, and is used to combine the first combined beam light and the yellow laser light into a mixed color light beam;

The uniform light module is used to uniformize and shape the mixed color light to obtain projection light;

The imaging module is used to obtain a projection image based on the projection light.

Optionally, the three primary color LED light refers to the three primary color light emitted by the LED light emitting element, and the three primary color light may include red light, green light and blue light.

The yellow laser light refers to the yellow light emitted by a laser.

The possible structures of each module of the projection system provided by the embodiment of the present application are described below.

In the embodiment of the present application, the mixed color light source module includes: an LED light source unit and a laser light source unit;

Wherein, the LED light source unit includes a plurality of LEDs, and the plurality of LEDs include at least a first LED, a second LED and a third LED, wherein the first LED is used to emit red light, and the second LED Used to emit green light, the third LED is used to emit blue light;

The laser light source unit includes at least one laser, and the laser is used to emit yellow laser light.

Referring to Figure 4, Figure 4 provides a spectrum diagram of the first LED, the second LED and the third LED. The intensity of each primary color is determined by the white balance of the projection system. Of course, in other embodiments of the present application, the spectral curves of the first LED, the second LED, and the third LED can also be determined according to actual requirements.

In Figure 2, the mixed color light source module includes one laser, and in Figure 3, the mixed color light source module includes two lasers. In other embodiments of the present application, the number of lasers in the mixed-color light source module can also be three, four, or five, etc. This application does not limit this, and it depends on the actual situation. When the number of lasers in the mixed-color light source module is two or more, the spectra of the lasers emitted by each of the lasers may be the same or different.

Referring to FIGS. 5 and 6 , FIG. 5 shows a schematic spectrum diagram when the mixed-color light source module includes one laser, and FIG. 6 shows a schematic spectrum diagram when the mixed-color light source module includes two lasers. The intensity of each primary color is determined by the white balance of the projection system. Of course, in other embodiments of the present application, the spectral curve of the laser can also be determined according to actual requirements.

In the embodiment of the present application, the light modulation module includes: a circuit board and a first signal controller; wherein,

The circuit board is used to carry the LED light source unit and the laser light source unit;

The first signal controller is used for signal modulation and control of the LED light source unit and/or the laser light source unit.

The first signal controller is electrically connected to the LED light source unit and/or the laser light source unit through traces on the circuit board, so that the first signal controller 13 can communicate with the LED light source unit. and/or the laser light source unit performs signal transmission.

Optionally, the first signal controller may perform signal modulation and control on only the LED light source unit, may only perform signal modulation and control on the laser light source unit, or may perform signal modulation and control on both the LED light source unit. Signal modulation and control, and signal modulation and control of the laser light source unit, are not limited in this application and will depend on the actual situation.

In an embodiment of the present application, the collimation module includes a plurality of collimation elements, and the collimation elements are used to collimate the light emitted by the first LED, the second LED, the third LED or the laser. direct processing;

In Figures 2 and 3, the collimating element for collimating the light emitted by the first LED, the second LED or the third LED can be a lens or a lens group, and the collimating element for collimating the light emitted by the laser The collimating element can be an aspheric lens or a fiber coupling element.

In the embodiment of the present application, the beam combining module includes a first beam combining element, a second beam combining element and a reflective element;

The first beam combining element is disposed on a common light path of the first LED, the second LED and the third LED, and the first beam combining element is used to combine the red light, the green light and the blue light. After the color light is combined, the three primary color mixed light is obtained and transmitted along the first direction;

The second beam combining element is arranged in the first direction of the first beam combining element, and the second beam combining element is used to combine the three primary color mixed light and the yellow laser light to obtain the desired The mixed color light is transmitted along the first direction.

The number of the second beam combining elements is consistent with the number of the lasers. In Figure 2, the number of the second beam combining elements is one. In Figure 3, the number of the second beam combining elements is two. indivual.

The first beam combining element may be a dichroic mirror or an Interference narrow bandpass filters or holographic optical elements corresponding to the wavelength.

The reflective element is arranged in the first direction of the second beam combining element, and the reflective element is used to reflect the mixed color light to a second direction, and the first direction and the second direction are on the same plane. within, and the first direction intersects the second direction.

The reflective element can be a reflector. The reflective element is used to compress/fold the optical path of the combined mixed-color light, thereby reducing the overall volume of the projection system; the existence of the reflective element can improve the robustness of the optical path. , that is, when some errors occur during the construction of the system's optical path, the reflective element can still be used to shape the beam of mixed-color light to obtain mixed-color light that meets the requirements.

In the embodiment of the present application, the mixed color light source module further includes: a heat sink;

The heat sink is used to transfer heat generated by the LED light source unit and the laser light source unit to the outside.

More specifically, the heat sink transfers the heat generated by the LED light source unit and the laser light source unit to their respective bases, so that the operating temperatures of the LED light source unit and the laser light source unit are maintained at a certain operating temperature. within the range.

A heat sink refers to a structure whose temperature does not change with the amount of heat energy transferred to it. The heat sink can specifically be a structure with good thermal conductivity such as copper pillars.

In the embodiment of the present application, the light uniformity module includes: a light uniformity element and a relay lens; wherein,

The light uniforming element is used for uniformizing and shaping the mixed color light to obtain the mixed color light with a rectangular spot shape; the relay lens is used to image the mixed color light with the rectangular spot shape on the on the imaging module.

In the structure shown in FIG. 2 , when the second beam combining element is an interference narrow bandpass filter, refer to FIG. 7 , which shows a schematic reflection spectrum diagram of the second beam combining element. The yellow laser light and the three primary color LED lights are coaxially combined through the second beam combining element. Refer to Figure 8 for the combined spectrum. The brightness and saturation of the wavelength part of the yellow laser pipeline have been greatly improved.

In the structure shown in Figure 3, when the second beam combining element is an interference narrow bandpass filter, refer to Figure 9, which shows a schematic reflection spectrum diagram of the second beam combining element, as shown in Figure 9 The upper and lower pictures in 9 correspond to the laser light sources of the two bands respectively. The yellow laser light and the three primary color LED lights are coaxially combined through the second beam combining element. Refer to Figure 10 for the combined spectrum. The brightness and saturation of the wavelength part of the yellow laser pipeline have been greatly improved.

In an embodiment of the present application, the projection system further includes: an imaging module; the imaging module includes: a spatial light modulator and a second signal controller; wherein the second signal controller is used to direct the spatial light to the spatial light modulator. The modulator transmits a modulation signal such that the spatial light modulator outputs the projected image based on the modulation signal.

To sum up, embodiments of the present application provide a projection system that includes a mixed-color light source module, a light modulation module, a collimation module, a beam combining module, an even light module, and an imaging module, wherein the mixed-color light source module It is used to provide three primary color LED light and yellow laser light. The three primary color LED light and yellow laser light are combined by the beam combining module to form mixed color light. After the mixed color light is uniformed and shaped by the uniform light module, the projection light is obtained for projection. This system The yellow laser light is used to make up for the problem that the three primary color LED light cannot fully traverse the yellow part, solving the problem of poor color rendering ability of the projection system. At the same time, only one kind of laser light is used in the system, avoiding the use of all laser light sources as working light. This leads to the problem of large heat dissipation.

Each embodiment in this specification is described in a progressive manner. Each embodiment focuses on its differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple. For relevant details, please refer to the description in the method section.

The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be practiced in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (5)

1. A projection system, characterized in that it includes: a mixed color light source module, a light modulation module, a collimation module, a beam combining module, an even light module and an imaging module; wherein the mixed color light source module includes an LED light source unit and a laser light source unit, used to emit LED light and yellow laser light; the light modulation module includes: a circuit board and a first signal controller, used to carry, regulate and control the LED light source unit and laser light source unit; the collimation module It includes a collimating element for collimating LED light and laser light; the beam combining module includes a beam combining element and a reflective element for combining the three primary color LED light and the yellow laser light, and after the beam combining The mixed-color light compresses or folds the optical path; the uniform light module includes a uniform light element and a relay lens, which is used to uniformize and shape the mixed-color light to obtain projection light; the imaging module includes: spatial light a modulator and a second signal controller to obtain a projection image based on the projection light. 2. A projection system according to claim 1, characterized in that the LED light source unit includes a plurality of LEDs, and the plurality of LEDs include at least a first LED, a second LED and a third LED, wherein, The first LED is used to emit red light, the second LED is used to emit green light, and the third LED is used to emit blue light. 3. A projection system according to claim 1, characterized in that the beam combining element includes a first beam combining element and a second beam combining element; the first beam combining element is disposed on the first LED , on the common light path of the second LED and the third LED, the first beam combining element is used to combine the red light, the green light and the blue light to obtain mixed light of the three primary colors along the first direction. Transmission; the second beam combining element is arranged in the first direction of the first beam combining element, and the second beam combining element is used to combine the three primary color mixed light and the yellow laser light to The mixed color light is obtained and transmitted along the first direction. 4. A projection system according to claim 1, characterized in that the reflective element is disposed in the first direction of the second beam combining element, and the reflective element is used to direct the mixed color light to the third beam combining element. Two-directional reflection, the first direction and the second direction are in the same plane, and the first direction intersects the second direction. 5. A projection system according to claim 1, characterized in that the second signal controller is used to transmit a modulation signal to a spatial light modulator, so that the spatial light modulator outputs a projection image based on the modulation signal.