Colorful projection light module for MicroLED

Abstract

The color projection light module comprises a lens cone, a MicroLED lamp, a color wheel and a lens group, the interior of the lens cone is of a hollow structure, the lens group is contained in the lens cone, the lens group is composed of a plurality of lenses, the light inlet position of the lens cone is connected with a lamp panel, the MicroLED lamp is arranged on the lamp panel, the MicroLED lamp maps a picture image through the lamp panel and the lens group, and the color wheel is connected with the lens group. The color wheel is arranged between the lens group and the MicroLED lamp or between adjacent lenses in the lens group, a motor is arranged at the central point of the color wheel, the motor rotates according to a certain frequency so as to drive the color wheel to rotate, the central point of the color wheel is close to the edge of the MicroLED lamp, and the top of the motor is close to the edge of the MicroLED lamp. When the light color of the MicroLED lamp changes, the color wheel is replaced, and the light-transmitting area or the transmission area is changed.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive intelligent headlights. More specifically, it relates to a color projection light module for MicroLED. Background Art

[0002] Currently, cars have become the main means of transportation for ordinary people. Automotive headlights are generally used for lighting, such as high-beam lighting and low-beam lighting. With the continuous iteration of the automotive intelligent wave and the underlying light source technology, headlights are evolving from single lighting in the past to the direction of intelligence and emotion. The million-pixel or million-level pixel projection headlights that can achieve intelligent lighting, projection interaction, and more styling possibilities are becoming a new trend.

[0003] Currently, million-pixel projection generally adopts a solution based on DMD chips of Texas Instruments. By irradiating the light source onto the DMD chip, adjusting the micro-mirror switches on the DMD chip, and cooperating with the projection lens, the projection output of the image is realized. The color of the irradiating light source is white light. Currently, the mainstream light source for million-level pixel projection is MicroLED, and the emitted color is white light. Therefore, the final output of the projection headlight is also white light. Currently, million-pixel projection generally adopts a solution based on DMD chips of Texas Instruments. By irradiating the light source onto the DMD chip, adjusting the micro-mirror switches on the DMD chip, and cooperating with the projection lens, the projection output of the image is realized. The color of the irradiating light source is white light. Therefore, the final output of the projection headlight is also white light.

[0004] The utility model patent with the publication number of CN220981088U discloses a multi-pattern projection lamp, including: a multi-pattern projection lamp, including: a housing, with a light-transmitting part provided at the upper end of the housing; a circuit board, arranged inside the housing, with a plurality of light-emitting elements provided on the circuit board, and the plurality of light-emitting elements are distributed below the light-transmitting part and are circumferentially spaced apart on the circuit board; a plurality of optical modules are arranged inside the housing and are respectively located between the plurality of light-emitting elements and the light-transmitting part. The optical module includes a housing and a condenser lens group, a film, and an imaging lens group sequentially arranged from bottom to top in the housing: the circuit board is used to separately control the on / off state of each light-emitting element. The condenser lens group is used to condense and deflect the light emitted by the corresponding light-emitting element, so that the light emitted by different light-emitting elements forms an image at the same position on the imaging surface after passing through the corresponding optical module, without the need for splicing to form the required light pattern; and when forming projections of different patterns, only need to control a single light-emitting element to be lit.

[0005] However, the above technical solution only supports the monochromatic light emitted by the light-emitting elements and cannot meet the requirements of color images. In view of this, the utility model proposes a color projection light module for MicroLED, so that the final output of the projection headlight can also present colored light. Summary of the Utility Model

[0006] In view of this, in order to solve the above problems, the present utility model proposes a color projection light module for MicroLED, including a lens barrel 1, a MicroLED lamp 3, a color wheel 4 and a lens group 2, characterized in that: the inside of the lens barrel 1 is a hollow structure, and the inside of the lens barrel 1 contains the lens group 2, the lens group 2 is composed of a plurality of lenses, the light inlet of the lens barrel 1 is connected to a lamp board, and a MicroLED lamp 3 is arranged on the lamp board. The MicroLED lamp 3 can project a picture image through the lamp board and the lens group 2. The color wheel 4 is arranged between the lens group 2 and the MicroLED lamp 3 or between adjacent lenses in the lens group 2. A motor 5 is provided at the center point of the color wheel 4, and the motor 5 rotates at a certain frequency to drive the color wheel 4 to rotate. The center point of the color wheel 4 is located near the edge of the MicroLED lamp 3, and the top of the motor 5 is close to the edge of the MicroLED lamp 3. When the light color of the MicroLED lamp 3 changes, the color wheel 4 can be replaced to change to a light transmission area or a transmission area.

[0007] In some embodiments, the color wheel 4 has a circular or polygonal shape, and a plurality of color partitions are arranged on the color wheel 4. Adjacent color partitions are of the same or different colors, and the plurality of color partitions are at least two different colors.

[0008] Furthermore, the picture image projected by the MicroLED lamp 3 through the lamp board and / or the lens group 2 does not exceed the area where each color partition is located.

[0009] In some embodiments, when the light color emitted by the MicroLED lamp 3 is consistent with the light color of the required picture image, a certain color partition on the color wheel 4 can be made into a transparent light transmission area, and the transparent light transmission area is a light transmission sheet or a non-color wheel 4 notch area, and the picture image stays in this area.

[0010] Furthermore, when the light color emitted by the MicroLED lamp 3 is white light, the color wheel 4 is provided with a plurality of non-transparent light transmission areas and a transparent light transmission area, and the transparent light transmission area is a light transmission sheet or a non-color wheel 4 notch area. Each color partition can adopt a light transmission sheet of a certain color.

[0011] Furthermore, when the light color emitted by the MicroLED lamp 3 is colored light, a phosphor is applied on the light transmission sheet of each color partition in the non-transparent light transmission area of the color wheel 4 to form a transmission area, so that the MicroLED lamp 3 passes through the light transmission sheet of the corresponding color partition to transmit the same or different colors.

[0012] Further, when the light color emitted by the MicroLED lamp 3 is white light and the required light color of the screen image is color, the color wheel 4 can be divided into four color partitions, namely: a transparent light-transmitting area, a blue light-transmitting area, a green light-transmitting area, and a red light-transmitting area. The motor 5 rotates at a certain frequency to separate different monochromatic lights onto a specified optical path until a color screen image is synthesized and projected in sequence.

[0013] Further, when the light color emitted by the MicroLED lamp 3 is blue light and the required light color of the screen image is color, the color wheel 4 can be divided into four color partitions, namely: a transparent light-transmitting area, a yellow light-transmitting area, a green light-transmitting area, and a red light-transmitting area. And a phosphor coating is applied to each color light-transmitting area. The motor 5 rotates at a certain frequency to separate different monochromatic lights onto a specified optical path until a color screen image is synthesized and projected in sequence.

[0014] Further, when the light color emitted by the MicroLED lamp 3 is blue light and the required light color of the screen image is color, the color wheel 4 can be divided into three color partitions, namely: a transparent light-transmitting area, a green light-transmitting area, and a red light-transmitting area. And a phosphor coating is applied to each color light-transmitting area. The motor 5 rotates at a certain frequency to separate different monochromatic lights onto a specified optical path until a color screen image is synthesized and projected in sequence.

[0015] The beneficial effects of the present utility model: The present utility model provides a color projection light module for MicroLED, including a lens barrel 1, a MicroLED lamp 3, a color wheel 4, and a lens group 2. The interior of the lens barrel 1 is a hollow structure, and the lens barrel 1 contains a lens group 2. The lens group 2 is composed of multiple lenses. The light inlet of the lens barrel 1 is connected to a lamp board, and the MicroLED lamp 3 is provided on the lamp board. The MicroLED lamp 3 can project a screen image through the lamp board and the lens group 2. The color wheel 4 is arranged between the lens group 2 and the MicroLED lamp 3 or between adjacent lenses in the lens group 2. The center point of the color wheel 4 is provided with a motor 5, and the motor 5 rotates at a certain frequency to drive the color wheel 4 to rotate. The center point of the color wheel 4 is located near the edge of the MicroLED lamp 3, and the top of the motor 5 is close to the edge of the MicroLED lamp 3. When the light color of the MicroLED lamp 3 changes, the color wheel 4 can be replaced to change to a light-transmitting area or a light-transmitting area. Description of the Drawings

[0016] Figure 1 It is an overall sectional view of the color projection light module for MicroLED of the present utility model.

[0017] Figure 2This is an exemplary diagram of the MicroLED lamp and color wheel structure of the color projection light module for MicroLED of the present utility model.

[0018] Figure 3 This is an exemplary diagram of the MicroLED lamp and color wheel structure of the color projection light module for MicroLED of the present utility model.

[0019] Figure 4 This is an exemplary diagram of the MicroLED lamp and color wheel structure of the color projection light module for MicroLED of the present utility model.

[0020] Figure 5 This is an exemplary diagram of the MicroLED lamp and color wheel structure of the color projection light module for MicroLED of the present utility model.

[0021] Figure 6 This is an exemplary diagram of the MicroLED lamp and color wheel structure of the color projection light module for MicroLED of the present utility model.

[0022] Description of main component symbols

[0023] Lens barrel 1, lens group 2, MicroLED lamp 3, color wheel 4, motor 5.

[0024] The following specific embodiments will further illustrate the present utility model in conjunction with the above-mentioned drawings. Specific embodiments

[0025] As Figure 1 shown, this is an overall sectional view of the color projection light module for MicroLED of the present utility model; as Figure 2 shown, this is an exemplary diagram of the MicroLED lamp and color wheel structure of the color projection light module for MicroLED of the present utility model; as Figure 3 shown, this is an exemplary diagram of the MicroLED lamp and color wheel structure of the color projection light module for MicroLED of the present utility model; as Figure 4 shown, this is an exemplary diagram of the MicroLED lamp and color wheel structure of the color projection light module for MicroLED of the present utility model; as Figure 5 shown, this is an exemplary diagram of the MicroLED lamp and color wheel structure of the color projection light module for MicroLED of the present utility model; as Figure 6 shown, this is an exemplary diagram of the MicroLED lamp and color wheel structure of the color projection light module for MicroLED of the present utility model.

[0026] Example 1:

[0027] As Figures 1-6As shown in the figure, a color projection light module for MicroLED includes a lens barrel 1, a MicroLED lamp 3, a color wheel 4, and a lens group 2. The interior of the lens barrel 1 is a hollow structure, and the lens group 2 is contained inside the lens barrel 1. The lens group 2 is composed of multiple lenses. The light inlet of the lens barrel 1 is connected to a lamp board, and the MicroLED lamp 3 is provided on the lamp board. The MicroLED lamp 3 can project a picture image through the lamp board and the lens group 2. The color wheel 4 is arranged between the lens group 2 and the MicroLED lamp 3 or between adjacent lenses in the lens group 2. A motor 5 is provided at the center point of the color wheel 4. The motor 5 rotates at a certain frequency, thereby driving the color wheel 4 to rotate. The center point of the color wheel 4 is located near the edge of the MicroLED lamp 3, and the top of the motor 5 is close to the edge of the MicroLED lamp 3. When the light color of the MicroLED lamp 3 changes, the color wheel 4 can be replaced to change to a light-transmitting area or a transmissive area.

[0028] The color wheel 4 has a circular or polygonal shape. Multiple color partitions are provided on the color wheel 4. Adjacent color partitions are of the same or different colors. The multiple color partitions are at least two different colors. The picture image projected by the MicroLED lamp 3 through the lamp board and / or the lens group 2 does not exceed the area where each color partition is located. When the light color emitted by the MicroLED lamp 3 is consistent with the light color of the required picture image, a certain color partition on the color wheel 4 can be made into a transparent light-transmitting area. The transparent light-transmitting area is a light-transmitting sheet or a non-notch area of the color wheel 4, and the picture image stays in this area.

[0029] When the light color emitted by the MicroLED lamp 3 is white light, there are multiple non-transparent light-transmitting areas and one transparent light-transmitting area on the color wheel 4. The transparent light-transmitting area is a light-transmitting sheet or a non-notch area of the color wheel 4. Each color partition can use a light-transmitting sheet of a certain color. When the light color emitted by the MicroLED lamp 3 is colored light, phosphor is applied on the light-transmitting sheet of each color partition in the non-transparent light-transmitting area of the color wheel 4 to form a transmissive area, so that the MicroLED lamp 3 transmits the same or different colors through the light-transmitting sheet of the corresponding color partition.

[0030] Embodiment 2:

[0031] As Figure 1 、 Figure 2 and Figure 3As shown in the figure, a color projection light module for MicroLED includes a lens barrel 1, a MicroLED lamp 3, a color wheel 4, and a lens group 2. The inside of the lens barrel 1 is a hollow structure, and the lens group 2 is contained inside the lens barrel 1. The lens group 2 is composed of multiple lenses. The light inlet of the lens barrel 1 is connected to a lamp board, and the MicroLED lamp 3 is provided on the lamp board. The MicroLED lamp 3 can project a picture image through the lamp board and the lens group 2. The color wheel 4 is arranged between the lens group 2 and the MicroLED lamp 3 or between adjacent lenses in the lens group 2. A motor 5 is provided at the center point of the color wheel 4. The motor 5 rotates at a certain frequency, thereby driving the color wheel 4 to rotate. The center point of the color wheel 4 is located near the edge of the MicroLED lamp 3, and the top of the motor 5 is close to the edge of the MicroLED lamp 3. When the light color of the MicroLED lamp 3 changes, the color wheel 4 can be replaced to change to a light-transmitting area or a transmission area.

[0032] The outer shape of the color wheel 4 is set to be circular or polygonal. Multiple color partitions are provided on the color wheel 4. Adjacent color partitions are of the same or different colors. The multiple color partitions are at least two different colors. The picture image projected by the MicroLED lamp 3 through the lamp board and / or the lens group 2 does not exceed the area where each color partition is located. When the light color emitted by the MicroLED lamp 3 is consistent with the light color of the required picture image, a certain color partition on the color wheel 4 can be made into a transparent light-transmitting area. The transparent light-transmitting area is a light-transmitting sheet or a non-notch area of the color wheel 4, and the picture image stays in this area.

[0033] When the light color emitted by the MicroLED lamp 3 is white light, there are multiple non-transparent light-transmitting areas and one transparent light-transmitting area on the color wheel 4. The transparent light-transmitting area is a light-transmitting sheet or a non-notch area of the color wheel 4. Each color partition can adopt a light-transmitting sheet of a certain color. When the light color emitted by the MicroLED lamp 3 is white light and the light color of the required picture image is color, the color wheel 4 can be divided into four color partitions, namely: a transparent light-transmitting area, a blue light-transmitting area, a green light-transmitting area, and a red light-transmitting area. The motor 5 rotates at a certain frequency to separate different monochromatic lights on the specified optical path until they are synthesized in time sequence and project a color picture image.

[0034] Embodiment 3:

[0035] As Figure 1 、 Figure 4 and Figure 5As shown in the figure, a color projection light module for MicroLED includes a lens barrel 1, a MicroLED lamp 3, a color wheel 4, and a lens group 2. The inside of the lens barrel 1 is a hollow structure, and the lens group 2 is contained inside the lens barrel 1. The lens group 2 is composed of multiple lenses. The light inlet of the lens barrel 1 is connected to a lamp board, and a MicroLED lamp 3 is provided on the lamp board. The MicroLED lamp 3 can project a picture image through the lamp board and the lens group 2. The color wheel 4 is arranged between the lens group 2 and the MicroLED lamp 3 or between adjacent lenses in the lens group 2. A motor 5 is provided at the center point of the color wheel 4. The motor 5 rotates at a certain frequency, thereby driving the color wheel 4 to rotate. The center point of the color wheel 4 is located near the edge of the MicroLED lamp 3, and the top of the motor 5 is close to the edge of the MicroLED lamp 3. When the light color of the MicroLED lamp 3 changes, the color wheel 4 can be replaced to change to a light-transmitting area or a transmission area.

[0036] The color wheel 4 has a circular or polygonal shape, and multiple color partitions are provided on the color wheel 4. Adjacent color partitions are of the same or different colors. The multiple color partitions are at least two different colors. The picture image projected by the MicroLED lamp 3 through the lamp board and / or the lens group 2 does not exceed the area where each color partition is located. When the light color emitted by the MicroLED lamp 3 is consistent with the light color of the required picture image, a certain color partition on the color wheel 4 can be made into a transparent light-transmitting area, and the transparent light-transmitting area is a light-transmitting sheet or a non-notch area of the color wheel 4, and the picture image stays in this area.

[0037] When the light color emitted by the MicroLED lamp 3 is colored light, a phosphor is applied on the light-transmitting sheet of each color partition in the non-transparent light-transmitting area of the color wheel 4 to form a transmission area, so that the MicroLED lamp 3 transmits the same or different colors through the light-transmitting sheet of the corresponding color partition. When the light color emitted by the MicroLED lamp 3 is blue light and the required picture image light color is colored, the color wheel 4 can be divided into four color partitions, namely: a transparent light-transmitting area, a yellow transmission area, a green transmission area, and a red transmission area, and a phosphor coating is applied on each color transmission area. The motor 5 rotates at a certain frequency to separate different monochromatic lights on the specified optical path until they are synthesized in time sequence and projected to form a colored picture image.

[0038] Example 4:

[0039] As Figure 1 and Figure 6As shown in the figure, a color projection light module for MicroLED includes a lens barrel 1, a MicroLED lamp 3, a color wheel 4, and a lens group 2. The inside of the lens barrel 1 is a hollow structure, and the lens group 2 is contained inside the lens barrel 1. The lens group 2 is composed of multiple lenses. The light inlet of the lens barrel 1 is connected to a lamp board, and a MicroLED lamp 3 is provided on the lamp board. The MicroLED lamp 3 can project a picture image through the lamp board and the lens group 2. The color wheel 4 is arranged between the lens group 2 and the MicroLED lamp 3 or between adjacent lenses in the lens group 2. A motor 5 is provided at the center point of the color wheel 4. The motor 5 rotates at a certain frequency, thereby driving the color wheel 4 to rotate. The center point of the color wheel 4 is located near the edge of the MicroLED lamp 3, and the top of the motor 5 is close to the edge of the MicroLED lamp 3. When the light color of the MicroLED lamp 3 changes, the color wheel 4 can be replaced to change to a light-transmitting area or a transmission area.

[0040] The color wheel 4 has a circular or polygonal shape. Multiple color partitions are provided on the color wheel 4. Adjacent color partitions are of the same or different colors. The multiple color partitions are at least two different colors. The picture image projected by the MicroLED lamp 3 through the lamp board and / or the lens group 2 does not exceed the area where each color partition is located. When the light color emitted by the MicroLED lamp 3 is consistent with the light color of the required picture image, a certain color partition on the color wheel 4 can be made into a transparent light-transmitting area, and the transparent light-transmitting area is a light-transmitting sheet or a non-notch area of the color wheel 4, and the picture image stays in this area.

[0041] When the light color emitted by the MicroLED lamp 3 is colored light, a phosphor is coated on the light-transmitting sheet of each color partition in the non-transparent light-transmitting area of the color wheel 4 to form a transmission area, so that the MicroLED lamp 3 transmits the same or different colors through the light-transmitting sheet of the corresponding color partition. When the light color emitted by the MicroLED lamp 3 is blue light and the required picture image light color is colored, the color wheel 4 can be divided into three color partitions, namely: a transparent light-transmitting area, a green transmission area, and a red transmission area, and a phosphor coating is applied on each color transmission area. The motor 5 rotates at a certain frequency to separate different monochromatic lights on the specified optical path until a color picture image is synthesized and projected in sequence.

[0042] Advantages of the present utility model: The present utility model provides a color projection light module for MicroLED, which includes a lens barrel 1, a MicroLED lamp 3, a color wheel 4, and a lens group 2. The interior of the lens barrel 1 is a hollow structure, and the lens group 2 is contained inside the lens barrel 1. The lens group 2 is composed of multiple lenses. The bottom of the lens barrel 1 is connected to a lamp board, and the MicroLED lamp 3 is provided on the lamp board. The MicroLED lamp 3 can project a picture image through the lamp board and the lens group 2. The color wheel 4 is arranged between the lens group 2 and the MicroLED lamp 3 or between adjacent lenses in the lens group 2. A motor 5 is provided at the center point of the color wheel 4. The motor 5 rotates at a certain frequency, thereby driving the color wheel 4 to rotate. The center point of the color wheel 4 is located near the edge of the MicroLED lamp 3, and the top of the motor 5 is close to the edge of the MicroLED lamp 3. When the light color of the MicroLED lamp 3 changes, the color wheel 4 can be replaced to change to a light transmission area or a transmission area.

[0043] The above embodiments merely represent several implementation manners of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.

Claims

1. A color projection light module for MicroLED, comprising a lens barrel (1), a MicroLED lamp (3), a color wheel (4) and a lens group (2), characterized in that: The lens barrel (1) has a hollow structure inside. The lens barrel (1) contains a lens group (2) inside. The lens group (2) is composed of a plurality of lenses. The light inlet of the lens barrel (1) is connected to a light board. A MicroLED lamp (3) is provided on the light board. The MicroLED lamp (3) projects a picture image through the light board and the lens group (2). The color wheel (4) is arranged between the lens group (2) and the MicroLED lamp (3) or between adjacent lenses in the lens group (2). A motor (5) is arranged at the center point of the color wheel (4). The motor (5) rotates at a certain frequency, thereby driving the color wheel (4) to rotate. The center point of the color wheel (4) is located near the edge of the MicroLED lamp (3), and the top of the motor (5) is arranged near the edge of the MicroLED lamp (3). When the light color of the MicroLED lamp (3) changes, the color wheel (4) is replaced to change to a light-transmitting area or a transmission area.

2. The color projection light module for MicroLED according to claim 1, characterized in that: The color wheel (4) has a circular or polygonal shape, and a plurality of color partitions are arranged on the color wheel (4). Adjacent color partitions are of the same or different colors, and the plurality of color partitions are of at least two different colors.

3. The color projection light module for MicroLED according to claim 1, characterized in that: Said The image projected by the MicroLED lamp (3) through the lamp panel and / or the lens assembly (2) does not exceed the area of ​​each color partition of the color wheel (4).

4. The color projection light module for MicroLED according to claim 1, characterized in that: When the light color emitted by the MicroLED lamp (3) is consistent with the desired image color, a certain color partition on the color wheel (4) is made into a transparent light-transmitting area, and the transparent light-transmitting area is a light-transmitting sheet or a non-color wheel (4) notch area, and the image is allowed to stay in this area.

5. The color projection light module for MicroLED according to claim 1, characterized in that: When the light color emitted by the MicroLED lamp (3) is white light, a plurality of non-transparent light-transmitting areas and one transparent light-transmitting area are provided on the color wheel (4), wherein the transparent light-transmitting area is a light-transmitting sheet or a non-color wheel (4) notch area, and each color partition adopts a light-transmitting sheet of a certain color.

6. The color projection light module for MicroLED according to claim 1, characterized in that: When the light emitted by the MicroLED lamp (3) is colored light, fluorescent powder is applied to the light-transmitting sheet of each color partition of the non-transparent light-transmitting area on the color wheel (4) to form a transmission area, so that the MicroLED lamp (3) transmits the same or different colors through the light-transmitting sheet of the corresponding color partition.

7. The color projection light module for MicroLED according to claim 1, characterized in that: When the light color emitted by the MicroLED lamp (3) is white light, and the required image light color is color, the color wheel (4) is divided into four color zones, namely: a transparent light-transmitting zone, a blue light-transmitting zone, a green light-transmitting zone, and a red light-transmitting zone. The motor (5) rotates at a certain frequency to separate different monochromatic lights on a specified light path until they are synthesized in time sequence and a color image is projected.

8. The color projection light module for MicroLED according to claim 1, characterized in that: When the light color emitted by the MicroLED lamp (3) is blue light, and the required image light color is color, the color wheel (4) is divided into four color zones, namely: a transparent light transmission zone, a yellow light transmission zone, a green light transmission zone and a red light transmission zone, and each color light transmission zone is coated with a fluorescent coating. The motor (5) rotates at a certain frequency to separate different monochromatic lights on a specified light path until they are synthesized in time sequence and a color image is projected.

9. The color projection light module for MicroLED according to claim 1, characterized in that: When the light color emitted by the MicroLED lamp (3) is blue light, and the required image light color is color, the color wheel (4) is divided into three color zones, namely: a transparent light transmission zone, a green light transmission zone and a red light transmission zone, and each color transmission zone is coated with a fluorescent coating. The motor (5) rotates at a certain frequency to separate different monochromatic lights on a specified light path until they are synthesized in time sequence and a color image is projected.

Images