CN221668160U - Optical system and projection device - Google Patents

Abstract

The embodiment of the application provides an optical system and a projection device, wherein the optical system comprises: a first light source; a first black-and-white liquid crystal panel for receiving and reflecting the first color light after modulation; a second light source for emitting a second color light and a third color light; the second black-and-white liquid crystal panel is used for receiving and reflecting the second color light and the third color light after modulation; the light combining component is used for combining the first color light, the second color light and the third color light and sending the combined light into the projection lens. The reflective black-and-white liquid crystal panel is used in the optical system, the two partitioned light sources and the light combination assembly are matched, the projection light path is set, the color film is canceled, the condition that the light efficiency caused by the absorption of the color film to light is reduced can be reduced, the reflective liquid crystal panel is used, the condition that the light efficiency caused by the low transmittance of the transmissive liquid crystal panel is reduced can be reduced, and the light energy utilization rate and the light efficiency can be improved.

Description

Optical system and projection device

Technical Field

The present application relates to a projection apparatus, and more particularly to an optical system and a projection apparatus.

Background

A conventional transmissive LCD (Liquid-CRYSTAL DISPLAY) projection device relies on color filters to separate three primary colors of red, green and blue, and mixes the light to achieve a color dimming effect. The aperture ratio of the thin film transistor device in the transmissive LCD cannot be high due to its inherent characteristics. When the light machine with a single light source is adopted, the light path of the light machine has to be increased with a reflector to meet the requirement of final combined light display, so that the light efficiency of the transmission type LCD projection device is lost.

Disclosure of utility model

The embodiment of the application provides an optical system and a projection device, which can improve the light energy utilization rate and the light efficiency of the projection device.

In a first aspect, an embodiment of the present application provides an optical system applied to a projection apparatus, where the projection apparatus includes a projection lens, the optical system includes:

A first light source for emitting a first color light;

The first black-and-white liquid crystal panel is arranged corresponding to the first light source so as to receive the first color light and reflect the first color light after modulation;

a second light source for emitting a second color light and a third color light;

The second black-and-white liquid crystal panel is arranged corresponding to the second light source so as to receive the second color light and the third color light and reflect the second color light and the third color light after modulation;

The light combining component is arranged between the first black-and-white liquid crystal panel and the second black-and-white liquid crystal panel, and is used for combining the first color light, the second color light and the third color light and then sending the combined light into the projection lens.

Optionally, the optical system further includes:

And the color wheel is arranged between the second light source and the second black-and-white liquid crystal panel, so that the light rays emitted by the second light source are filtered out to obtain the second color light rays and the third color light rays.

Optionally, the color wheel includes a second color filter and a third color filter, where the second color filter and the third color filter are alternately arranged.

Optionally, the second color light and the third color light are emitted to the second black-and-white liquid crystal panel in a time sharing manner.

Optionally, the time-sharing interval duration of the second color light ray and the third color light ray is 1/120 of a second.

Optionally, the optical system further includes:

The first collimating mirror is arranged between the first light source and the first black-and-white liquid crystal panel and used for adjusting the emitted light emitted by the first light source to collimated light;

The second collimating mirror is arranged between the second light source and the color wheel and used for adjusting the emitted light emitted by the second light source to collimated light.

Optionally, the light combining component includes:

The first polarization spectroscope is obliquely arranged relative to the first black-and-white liquid crystal panel and the first light source respectively, and is used for reflecting first color light rays to the first black-and-white liquid crystal panel and transmitting the first color light rays reflected back by the first black-and-white liquid crystal panel;

The second polarization spectroscope is obliquely arranged relative to the second black-and-white liquid crystal panel and the second light source respectively, and is used for reflecting the second color light rays and the third color light rays to the second black-and-white liquid crystal panel and transmitting the second color light rays and the third color light rays reflected by the second black-and-white liquid crystal panel by the transmission mirror.

Optionally, the light combining component further includes:

And the light combining lens is obliquely arranged relative to the first black-and-white liquid crystal panel and the second black-and-white liquid crystal panel, and is used for transmitting the first color light, reflecting the second color light and the third color light, combining the first color light, the second color light and the third color light and then sending the combined light into the projection lens.

Optionally, the first color light has a first optical path from the first black-and-white liquid crystal panel to the projection lens, the second color light and the third color light have a second optical path and a third optical path from the second black-and-white liquid crystal panel to the projection lens, and the first optical path, the second optical path and the third optical path are equal.

In a second aspect, an embodiment of the present application further provides a projection apparatus, including:

an optical system as claimed in any one of the preceding claims;

and the projection lens is used for receiving the light rays emitted by the optical system.

In the optical system and the projection device provided by the embodiment of the application, the reflective black-and-white liquid crystal panel is used in the optical system, and the two partitioned light sources and the light combination assembly are matched to realize the setting of a projection light path, so that the setting of a color film is canceled, the condition of light efficiency reduction caused by the absorption of the color film to light can be reduced, the reflective liquid crystal panel is used, the condition of light efficiency reduction caused by low transmittance of the transmissive liquid crystal panel can be reduced, and the light energy utilization rate and the light efficiency can be improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is evident that the figures in the following description are only some embodiments of the application, from which other figures can be obtained without inventive effort for a person skilled in the art.

For a more complete understanding of the present application and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings. Wherein like reference numerals refer to like parts throughout the following description.

Fig. 1 is a schematic structural diagram of a projection apparatus according to an embodiment of the present application.

Fig. 2 is a schematic diagram of a first structure of an optical system according to an embodiment of the present application.

Fig. 3 is a schematic diagram of a second structure of an optical system according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of a color wheel according to an embodiment of the present application.

Fig. 5 is a schematic diagram of a third structure of an optical system according to an embodiment of the present application.

Fig. 6 is a schematic diagram of a fourth configuration of an optical system according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a projection apparatus according to an embodiment of the application. The embodiment of the application provides a projection device 1, wherein the projection device 1 can be a projector or a projector, and is a device capable of projecting images or videos onto a curtain. The projection device 1 may also be a Head Up Display (HUD) system in an automobile, or referred to as a Head Up Display system, which means a blind operation, multifunctional dashboard centered on the vehicle driver. The head-up display system is used for projecting important driving information such as speed per hour and navigation onto a windshield in front of a driver, so that the driver can see the important driving information such as speed per hour and navigation without lowering the head and turning the head as much as possible.

Depending on the operation mode, the projection device includes various types such as CRT (Cathode Ray Tube), LCD, DLP (DIGITAL LIGHT Processing, digital projection optical processor), and 3 LCD. Among them, DLP technology costs are high, and core devices are monopolized by developers. However, although the cost of LCD projection is low, the brightness and color gamut are not as high as those of DLP schemes, and the conventional LCD schemes require adding color filters, which are usually absorption type to allow specific wavelengths to pass through, while light in other wavebands is absorbed, and the light energy is absorbed and then becomes heat, so that the liquid crystal temperature is too high, and the liquid crystal performance is also affected.

In addition, the conventional transmission type LCD projection device is used for separating three primary colors of red, green and blue by means of color filters and mixing light to realize a color dimming effect. The aperture ratio of the thin film transistor device in the transmissive LCD cannot be high due to its inherent characteristics. When the light machine with a single light source is adopted, the light path of the light machine has to be increased with a reflector to meet the requirement of final combined light display, so that the light efficiency of the transmission type LCD projection device is lost.

In order to reduce the above-described problems, an embodiment of the present application improves an optical system in the projection apparatus 1, and will be described below with reference to the accompanying drawings.

The optical system 100 may be applied to the projection apparatus 1, but the optical system 100 is not limited to be applied to the projection apparatus 1, for example, may also be applied to an illumination device or other display device, and the embodiment of the present application is described by taking the application of the optical system 100 to the projection apparatus 1 as an example, and should not be construed as limiting the projection apparatus 1.

The projection device 1 comprises, for example, an optical system 100 and a projection lens 200, the optical system 100 being adapted to provide a modulated light source and to input it into the projection lens 200. The projection lens 200 is the last link of the whole light path, and determines the core parameters of the projection device 1, such as the color, brightness, focusing definition, etc., that is, the device for projecting the picture onto the curtain.

It should be noted that, the projection lens 200 may also be an integral part of the optical system 100, where the projection lens 200 is distinguished from the optical system 100 for convenience of description, and should not be construed as limiting the projection lens 200 and the optical system 100.

For example, please refer to fig. 1 in combination with fig. 2, fig. 2 is a schematic diagram of a first structure of an optical system according to an embodiment of the present application. The optical system 100 includes a first black-and-white liquid crystal panel 110, a second black-and-white liquid crystal panel 120, a first light source 130, a second light source 140, and a light combining component 160.

The black-and-white liquid crystal panel generally uses TN (Twist Nematic) twisted nematic liquid crystal, and the working principle of the black-and-white liquid crystal panel is as follows: the nematic liquid crystal is sandwiched between two glass sheets, the surface of which is coated with a transparent conductive film ITO (indium tin oxide) for electrodes, and then an alignment layer PI (polyimide) is coated on the glass with the film electrodes so that the liquid crystal is aligned in a specific direction parallel to the glass surface. The natural state of the liquid crystal has a twist of 90 degrees, the liquid crystal molecules can be rotated by an electric field, the birefringence of the liquid crystal changes with the direction of the liquid crystal, and the polarization direction of the polarized light is rotated after passing through the TN type liquid crystal as a result. As long as the appropriate thickness is chosen to change the polarization direction of the polarized light by just 90 degrees, two parallel polarizers can be used to make the light completely non-passing. The liquid crystal direction is parallel to the electric field direction by a voltage large enough so that the polarization direction of the light is not changed and the light can pass through the second polarizer. Thus, the brightness of the light can be controlled.

In addition, the first black-and-white liquid crystal panel 110 and the second black-and-white liquid crystal panel 120 in the embodiment of the application are both reflective black-and-white liquid crystal panels, and are different from the common liquid crystal panels in that the reflective black-and-white liquid crystal panels cancel the arrangement of the optical filters and cancel the backlight, and the light is modulated by the reflective light source. Illustratively, the first black-and-white liquid crystal panel 110 and the second black-and-white liquid crystal panel 120 are used for modulating and reflecting light, and the first black-and-white liquid crystal panel 110 and the second black-and-white liquid crystal panel 120 are disposed at intervals.

The first light source 130 emits the first color light toward the first black-and-white liquid crystal panel 110, and in other words, the first black-and-white liquid crystal panel 110 is disposed corresponding to the first light source 130 to receive the first color light and reflect the first color light after modulation. The second light source 140 emits a second color light and a third color light toward the second black-and-white liquid crystal panel 120, and in other words, the second black-and-white liquid crystal panel 120 is disposed corresponding to the second light source 140 to receive the second color light and the third color light, and reflect the second color light and the third color light after modulation. The first, second and third color light are three primary colors of light forming a picture, namely RGB, or red, green and blue light. Different picture display can be realized by mixing the first color light, the second color light and the third color light. For example, the first light source 130 and the second light source 140 may be light emitting diodes, or the first light source 130 and the second light source 140 may be laser tubes.

The light combining component 160 is disposed between the first black-and-white liquid crystal panel 110 and the second black-and-white liquid crystal panel 120, and the light combining component 160 is configured to combine the first color light, the second color light and the third color light and send the combined light to the projection lens 200.

In the optical system 100 provided by the embodiment of the application, the reflective black-and-white liquid crystal panel is used in the optical system 100, and the arrangement of the projection light path is realized by matching with the two partitioned light sources and the light combining component 160, so that the arrangement of the color film is canceled, the condition of light efficiency reduction caused by the absorption of the color film to light can be reduced, the reflective liquid crystal panel is used, the condition of light efficiency reduction caused by low transmittance of the transmissive liquid crystal panel can be reduced, and the light energy utilization rate and the light efficiency can be improved.

The second light source 140 is a color mixing light source, such as a yellow light source, a cyan light source or a bright purple light source, and the second light source 140 can split a second color light and a third color light through a color wheel, for example, the yellow light source can split red light and green light; for another example, a cyan light source may split green light and blue light; also for example, a bright violet light source may split red and blue. The embodiment of the present application is described by taking the second light source 140 as a yellow light source, and should not be construed as limiting the type of the second light source 140. At this time, the yellow light source can be obtained by exciting a blue light emitting diode with fluorescent powder.

For example, referring to fig. 3, fig. 3 is a schematic diagram of a second structure of an optical system according to an embodiment of the application. The optical system 100 further includes a color wheel 150, where the color wheel 150 is disposed between the second light source 140 and the second black-and-white liquid crystal panel 120 to filter the light emitted by the second light source 140 to the second color light and the third color light.

Fig. 4 is a schematic structural diagram of a color wheel according to an embodiment of the present application, referring to fig. 3 and referring to fig. 4. The color wheel 150 may include a second color filter 151 and a third color filter 152, the second color filter 151 may filter light emitted by the second light source 140 to obtain second color light, and the third color filter 152 may filter light emitted by the second light source 140 to obtain third color light. The second color filters 151 and the third color filters 152 are alternately arranged, the number of the second color filters 151 and the third color filters 152 can be determined according to the light emission time sequence of the second color light and the third color light, and the second black-and-white liquid crystal panel 120 can be realized by combining the rotation speed of the color wheel 150.

The three sets of polarized light, i.e., the first color light, the second color light and the third color light, have the same polarization state, and the three sets of light respectively enter from the first black-and-white liquid crystal panel 110 and the second black-and-white liquid crystal panel 120, and a polarizer is further disposed on a side of the first black-and-white liquid crystal panel 110 facing the first light source 130, and a polarizer is also disposed on a side of the second black-and-white liquid crystal panel 120 facing the second light source 140, so that modulation of the three sets of polarized light can be achieved.

It should be noted that, the three-color light source three-partition time-sharing driving method often faces the reasons that the response time of the black-and-white liquid crystal panel is insufficient and the refresh rate cannot meet the requirements. Taking a projection device with a refresh rate of 60HZ as an example, in a time sequence manner, the refresh rate of the black-and-white liquid crystal panel needs to reach 180HZ to meet the requirement that the three-color light sources are sequentially displayed in time sequence, that is, the response period of the black-and-white liquid crystal panel needs to reach 5.55ms, however, the black-and-white liquid crystal panel cannot meet the quick response time, and the problems of crosstalk and the like are also easy to generate.

In order to solve the above-mentioned problem, the second color light and the third color light which are located in the same area, that is, both emit light toward the second black-and-white liquid crystal panel 120, are emitted in a time-sharing manner, or the second color light and the third color light are lighted in time sequence. The first light source 130 that emits light toward the first black-and-white liquid crystal panel 110 may be kept normally on because of no interference. Therefore, in the projection device 1 with the refresh rate of 60HZ, when the second color light and the third color light emitted toward the second black-and-white liquid crystal panel 120 are driven in a time-sharing manner, it is necessary that the refresh rate of the second black-and-white liquid crystal panel 120 reaches 120HZ, so that the two-color light sources sequentially display in time sequence, that is, the response period of the second black-and-white liquid crystal panel 120, or the light emission interval duration of the second color light and the third color light is 1/120s, that is, 8.33ms, and the second black-and-white liquid crystal panel 120 can generally meet the response time. Also, since the visual residue of the human eye is usually around 20ms, that is, the refresh rate is greater than 50HZ. Therefore, the two-color light sources are driven in a time-sharing manner, so that the response time of the second black-and-white liquid crystal panel 120 can be satisfied, and the watching effect of a user is not affected. When the actual image is displayed, the RGB image is processed by the image processing unit, and then is processed by the color wheel 150, for example, and changed into red light and green light, that is, two colors of R and G, the red monochromatic light and the green monochromatic light according to the time sequence are incident on the second black-and-white liquid crystal panel 120, the second black-and-white liquid crystal panel 120 modulates the red image and the green image in turn, and reflects the light after modulating the image, and the first color light is reflected by the first black-and-white liquid crystal panel 110 to be combined with the second color light and the third color light to form the image. The R and G frames are decomposed on the same side and sent to the second black-and-white liquid crystal panel 120 in sequence, and the B frames are repeatedly sent to the first black-and-white liquid crystal panel 110 for display twice. Thus, the B portion of the same sub-frame is displayed at a frame rate of 120HZ, and thus the brightness of the first light source 130 can be reduced as needed to ensure white balance after light combination.

The first black-and-white liquid crystal panel 110 and the second black-and-white liquid crystal panel 120 are disposed at a first preset angle, and the first light source 130 and the second light source 140 are disposed at a second preset angle, which is the same as the first preset angle. For example, the first preset included angle and the second preset included angle are both 90 degrees, so that the optical paths among the first color light, the second color light and the third color light are set to be equal, the zooming function of the projection device 1 is realized, and the requirements of different users are met.

For example, please refer to fig. 1 to 4 in combination with fig. 5, fig. 5 is a schematic diagram of a third structure of an optical system according to an embodiment of the present application. The light combining assembly 160 includes a first polarizing beam splitter 161, a second polarizing beam splitter 162, and a light combining lens 163.

The polarizing beamsplitter may also be referred to as a polarizing beamsplitter (Polarization Beam Spliter, PBS). The main functions of the polarization spectroscope are: light rays perpendicular to the plane of incidence are reflected (S-polarized) and light rays parallel to the plane of the incident rays are passed (P-polarized). In the embodiment of the application, after the first color light, the second color light and the third color light of polarized incident light are modulated by the black-and-white liquid crystal panel, the polarized incident light has the same polarization state, and the initial polarization state can be reflected by the polarization spectroscope.

The first polarizing beam splitter 161 is disposed obliquely with respect to the first black-and-white liquid crystal panel 110 and the first light source 130, and the first polarizing beam splitter 161 is configured to reflect the first color light to the first black-and-white liquid crystal panel 110 and transmit the first color light reflected by the first black-and-white liquid crystal panel 110. For example, the first polarizing beam splitter 161 forms an included angle of 45 ° with the first black-and-white liquid crystal panel 110 and the first light source 130, and the first light source 130 and the first black-and-white liquid crystal panel 110 are not in the same line, so that the first polarizing beam splitter 161 can reflect the first color light emitted by the first light source 130 and transmit the first color light modulated and reflected by the first black-and-white liquid crystal panel 110.

The second polarizing beam splitter 162 is disposed obliquely with respect to the second black-and-white liquid crystal panel 120 and the second light source 140, and the second polarizing beam splitter 162 is configured to reflect the second color light and the third color light to the second black-and-white liquid crystal panel 120 and transmit the second color light and the third color light reflected back through the second black-and-white liquid crystal panel 120. It is understood that the second light source 140 may be disposed perpendicular to the second black-and-white liquid crystal panel 120, and the second polarizing beam splitter 162 forms an angle of 45 ° with the second black-and-white liquid crystal panel 120 and the second light source 140, so that the second polarizing beam splitter 162 may reflect the second color light and the third color light emitted by the second light source 140 and transmit the second color light and the third color light modulated by the second black-and-white liquid crystal panel 120 and reflected back.

The second polarizing beam splitter 162 is disposed parallel to the first polarizing beam splitter 161 to respectively meet the light emitting requirement of the second light source 140 and the light emitting requirement of the first light source 130.

For example, the light combining lens 163 is obliquely disposed with respect to the first black-and-white liquid crystal panel 110 and the second black-and-white liquid crystal panel 120, and the light combining lens 163 is configured to transmit the first color light, reflect the second color light and the third color light, and combine the first color light, the second color light and the third color light to send into the projection lens 200. For example, the included angles between the light combining lens 163 and the first black-and-white liquid crystal panel 110 and the second black-and-white liquid crystal panel 120 are 45 ° respectively, and the first black-and-white liquid crystal panel 110 and the second black-and-white liquid crystal panel 120 are vertically disposed, so that the light combining lens 163 can be used as a symmetrical boundary between the first black-and-white liquid crystal panel 110 and the second black-and-white liquid crystal panel 120, which is beneficial to the design of the same optical path of the first color light, the second color light and the third color light, and can reduce the volume of the optical system 100, thereby being beneficial to the miniaturization of the projection device 1.

Illustratively, the combiner 163 is a dichroic mirror or a polarizing beamsplitter. The polarizing beam splitter can reflect the light perpendicular to the incident plane and pass the light parallel to the incident plane, and it is required that the polarization angles of the light rays exiting the two reflective first and second black-and-white liquid crystal panels 110 and 120 are orthogonal. The dichroic mirror is also called a dichroic mirror, and separates a specific spectrum to change the direction of the light path of a part of the spectrum when the light is incident at 45 ° or at a large angle, so that the transmission of the light of the first color, the reflection of the light of the second color and the light of the third color can be satisfied, the light of the first color, the light of the second color and the light of the third color can be combined, the dichroic mirror has no requirement on the polarization state of the light source, and only the reflection angle of the first black-white liquid crystal panel 110 and the second black-white liquid crystal panel 120 can be matched.

It can be understood that the relative positions of the first light source 130, the first black-and-white liquid crystal panel 110, the first polarizing beam splitter 161 and the light combiner 163, and the relative positions of the second light source 140, the second black-and-white liquid crystal panel 120, the second polarizing beam splitter 162 and the light combiner 163 are set, that is, the first black-and-white liquid crystal panel 110, the first polarizing beam splitter 161, the second black-and-white liquid crystal panel 120 and the second polarizing beam splitter 162 are symmetrically arranged relative to the light combiner 163, so that the first optical path from the first black-and-white liquid crystal panel 110 to the projection lens 200, the second optical path from the second black-and-white liquid crystal panel 120 to the projection lens 200, and the third optical path from the second black-and-white liquid crystal panel 120 to the projection lens 200 are all equal, thereby zooming of the projection device 1 can be realized and resolution requirements of different users can be satisfied.

Referring to fig. 6, fig. 6 is a schematic diagram of a fourth structure of an optical system according to an embodiment of the application. It should be noted that, the first collimating mirror 170 may be further disposed between the first light source 130 and the first black-white liquid crystal panel 110, that is, the divergent light of the first light source 130 is adjusted to be collimated parallel light, so as to reduce the loss of light and further improve the light efficiency; accordingly, a second collimating mirror 180 may be disposed between the second light source 140 and the second black-and-white liquid crystal panel 120, for example, the second collimating mirror 180 is disposed between the second light source 140 and the color wheel 150, so that the second color light and the third color light can be adjusted to be collimated light, thereby reducing light loss. The optical path procedure for the optical system 100 may be: the first color light emitted by the first light source 130, such as blue light, is collimated and then enters the first black-and-white liquid crystal panel 110, and enters the light combining lens 163 and is transmitted after being dimmed by the first black-and-white liquid crystal panel 110. The second color light and the third color light emitted from the second light source 140 are turned on in a time sequence matching the picture of the second black-and-white liquid crystal panel 120, and when the second light source 140 such as the green light is incident, the second black-and-white liquid crystal panel 120 displays the green picture, and when the red light is incident, the second black-and-white liquid crystal panel 120 displays the red picture. The pictures (green and red) modulated by the second black-and-white liquid crystal panel 120 are incident on the combiner 163 and reflected, and are combined with the blue picture modulated by the first black-and-white liquid crystal panel 110 to form a color-displayed picture.

In the optical system 100 and the projection device 1 provided in the embodiments of the present application, a reflective black-and-white liquid crystal panel is used in the optical system 100, and in combination with the two partition light sources and the light combining component 160, the setting of the projection light path is realized, the setting of the color film is cancelled, the condition of light efficiency reduction caused by the absorption of the light by the color film can be reduced, the condition of light efficiency reduction caused by the low transmittance of the transmissive liquid crystal panel can be reduced by using the reflective liquid crystal panel, and the setting of the reflecting mirror is cancelled, so that the loss of light can be further reduced, and the light energy utilization rate and the light efficiency can be improved. The second color light and the third color light can meet the refresh rate requirement of the second black-and-white liquid crystal panel 120 by adopting a time-sharing driving mode, and the visual effect is not affected. The light combining component 160 adopts a symmetrical structure design, so that the optical paths of the first color light, the second color light and the third color light are equal, thereby realizing the zooming function of the projection device 1 and meeting the resolution requirements of different users. Compared with the arrangement of three light sources corresponding to three liquid crystal panels, the arrangement of two reflective liquid crystal panels can save the number of the liquid crystal panels, reduce the cost, reduce the light combining difficulty and simplify the device arrangement.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

In the description of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features.

The optical system and the projection device provided by the embodiments of the present application have been described in detail, and specific examples are applied to illustrate the principles and embodiments of the present application, and the above description of the embodiments is only for helping to understand the method and core idea of the present application; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the ideas of the present application, the present description should not be construed as limiting the present application in summary.

Claims (10)

1. An optical system for use in a projection device, the projection device including a projection lens, the optical system comprising:

A first light source for emitting a first color light;

The first black-and-white liquid crystal panel is arranged corresponding to the first light source so as to receive the first color light and reflect the first color light after modulation;

a second light source for emitting a second color light and a third color light;

The second black-and-white liquid crystal panel is arranged corresponding to the second light source so as to receive the second color light and the third color light and reflect the second color light and the third color light after modulation;

The light combining component is arranged between the first black-and-white liquid crystal panel and the second black-and-white liquid crystal panel, and is used for combining the first color light, the second color light and the third color light and then sending the combined light into the projection lens.

2. The optical system of claim 1, wherein the optical system further comprises:

And the color wheel is arranged between the second light source and the second black-and-white liquid crystal panel, so that the light rays emitted by the second light source are filtered out to obtain the second color light rays and the third color light rays.

3. The optical system of claim 2, wherein the color wheel includes a second color filter and a third color filter, the second color filter and the third color filter being alternately arranged.

4. The optical system of claim 2, wherein the second color light and the third color light are time-division emitted onto the second black-and-white liquid crystal panel.

5. The optical system of claim 4, wherein the second color light and the third color light are time-separated by a time period of 1/120 second.

6. The optical system of claim 2, wherein the optical system further comprises:

The first collimating mirror is arranged between the first light source and the first black-and-white liquid crystal panel and used for adjusting the emitted light emitted by the first light source to collimated light;

The second collimating mirror is arranged between the second light source and the color wheel and used for adjusting the emitted light emitted by the second light source to collimated light.

7. The optical system of any one of claims 1-6, wherein the light combining assembly comprises:

The first polarization spectroscope is obliquely arranged relative to the first black-and-white liquid crystal panel and the first light source respectively, and is used for reflecting first color light rays to the first black-and-white liquid crystal panel and transmitting the first color light rays reflected back by the first black-and-white liquid crystal panel;

The second polarization spectroscope is obliquely arranged relative to the second black-and-white liquid crystal panel and the second light source respectively, and is used for reflecting the second color light rays and the third color light rays to the second black-and-white liquid crystal panel and transmitting the second color light rays and the third color light rays reflected by the second black-and-white liquid crystal panel by the transmission mirror.

8. The optical system of claim 7, wherein the light combining assembly further comprises:

And the light combining lens is obliquely arranged relative to the first black-and-white liquid crystal panel and the second black-and-white liquid crystal panel, and is used for transmitting the first color light, reflecting the second color light and the third color light, combining the first color light, the second color light and the third color light and then sending the combined light into the projection lens.

9. The optical system of claim 8, wherein the first color light has a first optical path from the first black and white liquid crystal panel to the projection lens, the second color light and the third color light have a second optical path and a third optical path, respectively, from the second black and white liquid crystal panel to the projection lens, and the first optical path, the second optical path, and the third optical path are equal.

10. A projection apparatus, comprising:

the optical system of any one of claims 1-9;

and the projection lens is used for receiving the light rays emitted by the optical system.