Laser color mixing structure

Abstract

The present invention discloses a laser color mixing structure, which includes a control system, a laser light source, a motor, and a color wheel; wherein, the laser light source and the motor are respectively electrically connected to the control system, and the motor is configured to drive the color wheel to rotate self - sufficiently; the color wheel is provided with a plurality of color areas, and the plurality of color areas are arranged in a circular array around the self - rotation central axis of the color wheel; at least all the primary colors of any one color mixing mode are included in the plurality of color areas; the light output direction of the laser light source is aligned with the color area. The present invention projects mixed color light. At the same time, by controlling the irradiation time of the laser light source and the rotation speed of the motor, the percentage of each primary color in the mixed color light can be smoothly adjusted to achieve the function of "stepless color mixing", so that the present invention can project mixed color light with a wider color gamut.

Description

Technical Field

[0001] The present invention relates to a laser color mixing structure. Background Art

[0002] The color mixing principle of traditional DLP projectors is to use a combination of red, green, blue, white and other dichroic filters to separate the transmitted white light, and sequentially separate different monochromatic lights through a color wheel, and finally project a full-color image through a DMD and its projection lens. When red light hits the DMD, the lens tilts and flips according to the position and intensity where the red information should be displayed, and the same principle applies to green and blue lights and video signals. The image formed on the surface of the DMD can be projected through the projection lens. The color mixing principle of traditional DLP projectors is to project each single basic monochromatic light separately and then superimpose and mix the basic monochromatic lights on the screen. It can be seen that the DMD module is an essential core component of traditional DLP projectors. The DMD module has the disadvantage of a complex structure, which leads to the complex structure of traditional DLP projectors. In addition, traditional DLP projectors also have the disadvantage of a narrow color gamut for color mixing. Summary of the Invention

[0003] The object of the present invention is to provide a laser color mixing structure to solve one or more of the above-mentioned problems in the prior art.

[0004] According to one aspect of the present invention, a laser color mixing structure is provided, including a control system, a laser light source, a motor and a color wheel sheet; wherein, the laser light source and the motor are respectively electrically connected to the control system, and the motor is configured to drive the color wheel sheet to rotate; the color wheel sheet is provided with a plurality of color areas, and the plurality of color areas are arranged in a circular array around the rotation center axis of the color wheel sheet; at least all the basic colors of any one color mixing mode are included in the plurality of color areas; the light emitting direction of the laser light source is aligned with the color area.

[0005] During operation, S1, the positions and ranges of each color area are corresponding to the angular displacement values of the motor in the control system; specifically, in this embodiment, the motor is a servo motor, and the control system matches the positions and ranges of each color area with the step angle of the motor rotor through an encoder to allocate respective angular displacement value ranges and positions for each color area; and in the control system, the projection points where the laser light source irradiates on the color wheel sheet are also corresponding to the angular displacement values of the motor to associate the projection points where the laser light source irradiates on the color wheel sheet with the positions of each color area. In other embodiments, as long as it is a specific implementation structure that can achieve "corresponding the positions and ranges of each color area to the motor angle position coding in the control system" is acceptable.

[0006] S2. Select the required primary colors according to the preset light output color, and calculate the percentage occupancy of each primary color. Specifically, in this embodiment, the multiple color areas include a cyan area, a magenta area, and a yellow area arranged in sequence on the color wheel disc. The cyan area, the magenta area, and the yellow area together form a color mixing function disc group. Specifically, the cyan area, the magenta area, and the yellow area are the three essential primary colors in the CMY color mixing mode. More specifically, if we need to make a single-color light in a multiple color area emitted by the present invention, here taking cyan light as an example for detailed description, since cyan light is a primary color in the CMY color mixing mode, the occupancy of cyan is 100%. If we need to make a certain mixed-color light emitted by the present invention, the primary colors required for this mixed-color light are cyan, magenta, and yellow, and this mixed-color light is composed of 20% cyan, 30% magenta, and 50% yellow. Then, at this time, the occupancy of cyan is 20%, the occupancy of magenta is 30%, and the occupancy of yellow is 50%. Then input these occupancy data into the control system.

[0007] S3. The control system instructs the motor to drive the color wheel disc to rotate uniformly.

[0008] S4. The control system commands the laser light source to irradiate the color area corresponding to each primary color with the corresponding percentage of time within one rotation period of the color wheel. Specifically, for example: when it is necessary to emit monochromatic light cyan, since the proportion of cyan is 100%, within one rotation period of the color wheel, the control system commands the laser light source to only irradiate the cyan area. That is, when the cyan area on the color wheel rotates past the position of the projection point of the laser light source on the color wheel, the laser light source emits light for irradiation, so that the present invention can project monochromatic light. Another example: when it is necessary to emit the mixed color light described in step S2, since the proportion of cyan is 20%, the proportion of magenta is 30%, and the proportion of yellow is 50%, within one rotation period of the color wheel, when the control system commands the cyan area on the color wheel to rotate past the position of the projection point of the laser light source on the color wheel, the irradiation time of the laser light source is t1; when the control system commands the magenta area on the color wheel to rotate past the position of the projection point of the laser light source on the color wheel, the irradiation time of the laser light source is t2; when the control system commands the yellow area on the color wheel to rotate past the position of the projection point of the laser light source on the color wheel, the irradiation time of the laser light source is t3, where t1 + t2 + t3 = T, t1 / T = 20%, t2 / T = 30%, t3 / T = 50%; and by adjusting the rotation speed of the motor and the emission frequency of the laser light source, when the laser light source irradiates the rotating color wheel, the switching frequency between each primary color is greater than the resolution frequency of the recognition end (such as the human eye or a camera). The higher this switching frequency, the less likely it is to be distinguished, so that the present invention can project mixed color light that is not easily distinguishable. At the same time, by controlling the irradiation time of the laser light source and the rotation speed of the motor, the percentage of each primary color in the mixed color light can be smoothly adjusted to achieve the function of "infinite color mixing", so that the present invention can project mixed color light with a wider color gamut and has the characteristics of a simple structure.

[0009] In some embodiments, the multiple color areas include a cyan area, a magenta area, and a yellow area arranged in sequence on the color wheel, and the cyan area, the magenta area, and the yellow area together form a mixed color function chip group.

[0010] In this way, since the cyan area, the magenta area, and the yellow area are the three essential primary colors in the CMY color mixing mode, that is, "at least one of the multiple color areas includes all the primary colors of any color mixing mode" is realized.

[0011] In some embodiments, there are n mixed color function chip groups arranged on the color wheel; the multiple color areas further include n blank areas, and the blank areas are spaced between two adjacent mixed color function chip groups; where n is a natural number greater than 0.

[0012] In this way, initially, the control system can instruct the blank area on the color wheel to rotate to the position where the projection point of the laser light source on the color wheel is located. At this time, the projected light is white light, avoiding emitting a certain unwanted single color initially.

[0013] In some embodiments, n≥2.

[0014] In this way, by arranging multiple color mixing function sheet groups on the color wheel, within one rotation period of the color wheel, a higher cyclic switching frequency is obtained among the basic colors of the mixed light, making it difficult to be distinguished, and thus a better color mixing effect is obtained. At the same time, the laser light source can also irradiate the blank area to provide brightness for each color mixing function sheet group respectively, thereby increasing the brightness of the mixed light.

[0015] According to another aspect of the present invention, there is also provided a control method for a laser color mixing structure, including:

[0016] Corresponding the positions and ranges of each color area with the motor angle position coding in the control system;

[0017] Select the required basic colors according to the preset light output color, and calculate the percentage occupancy of each basic color;

[0018] The control system instructs the motor to drive the color wheel to rotate uniformly;

[0019] The control system instructs the laser light source to irradiate the corresponding color area of the corresponding basic color at the corresponding percentage occupancy time within one rotation period of the color wheel according to the percentage occupancy of each basic color. Description of the Drawings

[0020] Figure 1 It is a three-dimensional structure schematic diagram of a laser color mixing structure according to an embodiment of the present invention;

[0021] Figure 2 is Figure 1 A three-dimensional structure schematic diagram of another perspective of the laser color mixing structure shown;

[0022] Figure 3 is Figure 1 A structure schematic diagram of the color wheel in the laser color mixing structure shown;

[0023] Figure 4 It is a structure schematic diagram of the color wheel in another laser color mixing structure of an embodiment.

[0024] Reference Numerals in the Drawings:

[0025] 1 - Laser light source, 2 - Motor, 3 - Color wheel, C - Cyan area, M - Magenta area, Y - Yellow area, 314 - Blank area Detailed Embodiments

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] Embodiment 1:

[0028] Figures 1 to 3 Schematically shows the structure of a laser color mixing structure according to an embodiment of the present invention.

[0029] As Figures 1 to 3 shown, this laser color mixing structure includes a control system, a laser light source 1, a motor 2, and a color wheel 3; wherein, the laser light source 1 and the motor 2 are respectively electrically connected to the control system, and the motor 2 is configured to drive the color wheel 3 to rotate; the color wheel 3 is provided with a plurality of color areas, and the plurality of color areas are arranged in a circular array around the rotation center axis of the color wheel 3; at least all the primary colors of any one color mixing mode are included in the plurality of color areas; the light emitting direction of the laser light source 1 is aligned with the color area. In this embodiment, the laser light source 1 emits white laser light, and the rotating shaft of the motor 2 is connected to the rotation center of the color wheel 3.

[0030] The control method of this laser color mixing structure includes:

[0031] S1. Corresponding the positions and ranges of each color area in the control system with the angular displacement values of the motor 2; specifically, in this embodiment, the motor 2 is a servo motor, and the control system matches the positions and ranges of each color area with the step angle of the rotor of the motor 2 through an encoder to assign each color area its own angular displacement value range and position; and in the control system, the projection point where the laser light source 1 irradiates on the color wheel 3 is also corresponded with the angular displacement value of the motor 2 to associate the projection point where the laser light source 1 irradiates on the color wheel 3 with the positions of each color area; and the position of this projection point does not change with the rotation of the motor 2 and is fixed, so that the control system can obtain the specific position information of the color area moving to this projection point in real time. In other embodiments, as long as it is a specific implementation structure that can achieve "corresponding the positions and ranges of each color area in the control system with the angular position coding of the motor 2" is acceptable.

[0032] S2. Select the required primary colors according to the preset light output color, and calculate the percentage occupancy of each primary color; specifically, in this embodiment, the multiple color regions include a cyan region C, a magenta region M, and a yellow region Y arranged in sequence on the color wheel 3. The cyan region C, the magenta region M, and the yellow region Y together form a color mixing function chip group. Specifically, the cyan region C, the magenta region M, and the yellow region Y are the three essential primary colors in the CMY color mixing mode. More specifically, if we need to make a single-color light in multiple color regions emitted by the present invention, here we take cyan light as an example for detailed description. Since cyan light is a primary color in the CMY color mixing mode, the occupancy of cyan is 100%. If we need to make a certain mixed-color light emitted by the present invention, the primary colors required for the mixed-color light are cyan, magenta, and yellow, and the mixed-color light is composed of 20% cyan, 30% magenta, and 50% yellow. Then, at this time, the occupancy of cyan is 20%, the occupancy of magenta is 30%, and the occupancy of yellow is 50%. Then input these occupancy data into the control system. In other embodiments, the percentage occupancy of each primary color can also be adaptively adjusted according to the specific type of mixed-color light.

[0033] S3. The control system instructs the motor 2 to drive the color wheel 3 to rotate uniformly.

[0034] S4. The control system commands the laser light source 1 to irradiate the color area corresponding to the corresponding primary color at the corresponding percentage time within one rotation period of the color wheel 3 according to the percentage occupancy of each primary color. Specifically, for example: when monochromatic light cyan needs to be emitted, since the occupancy of cyan is 100%, within one rotation period of the color wheel 3, the control system commands the laser light source 1 to only irradiate the cyan area C. That is, when the cyan area C on the color wheel 3 rotates past the position of the projection point where the laser light source 1 irradiates on the color wheel 3, the laser light source 1 emits light for irradiation, so that the present invention can project monochromatic light. Another example: when the mixed light described in step S2 needs to be emitted, since the occupancy of cyan is 20%, the occupancy of magenta is 30%, and the occupancy of yellow is 50%, within one rotation period of the color wheel 3, when the control system commands the cyan area C on the color wheel 3 to rotate past the position of the projection point where the laser light source 1 irradiates on the color wheel 3, the laser light source 1 emits light for irradiation for a duration of t1. When the control system commands the magenta area M on the color wheel 3 to rotate past the position of the projection point where the laser light source 1 irradiates on the color wheel 3, the laser light source 1 emits light for irradiation for a duration of t2. When the control system commands the yellow area Y on the color wheel 3 to rotate past the position of the projection point where the laser light source 1 irradiates on the color wheel 3, the laser light source 1 emits light for irradiation for a duration of t3. Among them, t1 + t2 + t3 = T, t1 / T = 20%, t2 / T = 30%, t3 / T = 50%. And by adjusting the rotation speed of the motor 2 and the emission frequency of the laser light source 1, when the laser light source 1 irradiates the rotating color wheel 3, the switching frequency between each primary color is greater than the resolution frequency of the recognition end (such as the human eye or a camera). The higher this switching frequency, the less likely it is to be resolved, so that the present invention can project mixed light that is not easily distinguishable. At the same time, by controlling the irradiation time of the laser light source 1 and the rotation speed of the motor 2, the percentage occupancy of each primary color in the mixed light can be smoothly adjusted to achieve the function of "infinite color mixing", so that the present invention can project mixed light with a wider color gamut.

[0035] Specifically, in other embodiments, the multiple color areas may further include a red area, a green area, and a blue area arranged in sequence on the color wheel 3. The red area, the green area, and the blue area are the three essential primary colors in the RGB color mixing mode; that is, as long as the multiple color areas include all the primary colors of any color mixing mode.

[0036] Specifically, in this embodiment, the laser light source 1 includes a condenser collimating lens group and a light emitter

[0037] Further, in this embodiment, n color mixing function groups are arranged on the color wheel 3; the multiple color areas further include n blank areas 314, and the blank areas 314 are arranged between two adjacent color mixing function groups; where n is a natural number greater than 0. Specifically, in this embodiment, n = 1. In this way, initially, the control system can instruct the blank area 314 on the color wheel 3 to rotate to the position where the laser light source 1 projects on the color wheel 3, and at this time, the projected light is white light, avoiding emitting a certain unwanted single color initially.

[0038] Embodiment 2

[0039] The difference between this embodiment and Embodiment 1:

[0040] Figure 4 Schematically shows the structure of the laser color mixing structure of another embodiment of the present invention.

[0041] As Figure 4 shown, in this embodiment, n color mixing function groups are arranged on the color wheel 3; the multiple color areas further include n blank areas 314, and the blank areas 314 are arranged between two adjacent color mixing function groups; where n is a natural number greater than 0. And n ≥ 2. Specifically, in this embodiment, n = 2. In this way, by arranging multiple color mixing function groups on the color wheel 3, a higher cyclic switching frequency is obtained between the basic colors of the color mixing light within one rotation period of the color wheel 3, which is not easily distinguishable, and thus a better color mixing effect is obtained. At the same time, the laser light source 1 can also irradiate the blank area 314 to provide brightness for each color mixing function group respectively, thereby increasing the brightness of the color mixing light..

[0042] The above are only one or more embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. Laser color mixing structure, characterized in that, It includes a control system, a laser light source, a motor, and a color wheel sheet; Among them, the laser light source and the motor are electrically connected to the control system respectively, and the motor is configured to drive the color wheel sheet to rotate self - sufficiently; The color wheel sheet is provided with a plurality of color areas, and the plurality of color areas are arranged in a circular array around the self - rotation central axis of the color wheel sheet; at least all the primary colors of any one color mixing mode are included in the plurality of color areas; The light - emitting direction of the laser light source is aligned with the color area; During operation, the positions and ranges of each color area are corresponded to the angular displacement values of the motor in the control system. The control system matches the positions and ranges of each color area with the step angle of the motor rotor through an encoder, so as to allocate respective angular displacement value ranges and positions for each color area; and in the control system, the light - projecting point where the laser light source irradiates on the color wheel sheet is also corresponded to the angular displacement value of the motor for position confirmation, so as to associate the light - projecting point where the laser light source irradiates on the color wheel sheet with the positions of each color area. The position of this light - projecting point does not change with the rotation of the motor, and the control system obtains the specific position information of the color area moving to this light - projecting point in real time; Select the required primary colors according to the preset light - emitting color, calculate the percentage occupancy of each primary color. The plurality of color areas include a cyan area, a magenta or purplish - red area, and a yellow area arranged in sequence on the color wheel sheet. The cyan area, the magenta or purplish - red area, and the yellow area together form a color mixing function sheet group; The control system instructs the motor to drive the color wheel sheet to rotate uniformly; The control system instructs the laser light source to irradiate the color area corresponding to the corresponding primary color at the corresponding percentage occupancy time within one self - rotation period of the color wheel sheet according to the percentage occupancy of each primary color. By adjusting the rotation speed of the motor and the light - emitting frequency of the laser light source, when the laser light source irradiates the rotating color wheel sheet, the switching frequency between each primary color is greater than the resolution frequency of the recognition end. By controlling the irradiation time of the laser light source and the rotation speed of the motor, the percentage occupancy of each primary color in the mixed color light is smoothly adjusted to achieve the function of stepless color mixing; There are n such color mixing function sheet groups arranged on the color wheel sheet; The plurality of color areas further include n blank areas, and the blank areas are arranged between two adjacent color mixing function sheet groups; Wherein n is a natural number greater than 0.

2. The laser color mixing structure according to claim 1, wherein The plurality of color areas include a cyan area, a magenta or purplish - red area, and a yellow area arranged in sequence on the color wheel sheet. The cyan area, the magenta or purplish - red area, and the yellow area together form a color mixing function sheet group.

3. The laser color mixing structure according to claim 1, characterized in that, n≥2.

4. Control method for laser color mixing structure, characterized in that, A device for controlling the laser color mixing structure according to any one of claims 1 - 3, comprising: Corresponding the positions and ranges of each color area to the angular displacement values of the motor in the control system; Selecting the required primary colors according to the preset light - emitting color and calculating the percentage occupancy of each primary color; The control system instructs the motor to drive the color wheel sheet to rotate uniformly; The control system instructs the laser light source to irradiate the color area corresponding to the corresponding primary color at the corresponding percentage occupancy time within one self - rotation period of the color wheel sheet according to the percentage occupancy of each primary color.

Images