CN108255001B - Projection system - Google Patents
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- CN108255001B CN108255001B CN201611236304.3A CN201611236304A CN108255001B CN 108255001 B CN108255001 B CN 108255001B CN 201611236304 A CN201611236304 A CN 201611236304A CN 108255001 B CN108255001 B CN 108255001B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
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Abstract
The present invention relates to a projection system. The projection system comprises a light source, a color wheel and a spatial light modulator, wherein the light source is used for emitting light source light; the color wheel is positioned on a light path where the light source light is positioned, the color wheel comprises at least two segmentation areas, the at least two segmentation areas respectively receive the light source light and correspondingly emit at least two colors of light, the period of a light spot formed by the light source light irradiating on the color wheel from the beginning to the end of spanning the two segmentation areas is a spoke period, and the area irradiated by the light spot in the spoke period forms a spoke area; the area outside the spoke area contained in one segment area forms a non-spoke area, and the period of the light spot irradiating on one non-spoke area is a non-spoke period; the spatial light modulator is used for modulating at least two colors of light according to the image data to generate projection light required by the projection image, and the spatial light modulator is turned off in a spoke period corresponding to the spoke area.
Description
Technical Field
The invention relates to the technical field of display, in particular to a projection system.
Background
An existing projection system generally includes a light source, a color wheel, a spatial light modulator (such as an LCOS spatial light modulator or a DMD spatial light modulator), and a projection lens, where the color wheel receives light from the light source and sequentially emits three-color sequential light, such as red, green, and blue, the spatial light modulator performs image modulation on the sequential light emitted from the color wheel according to image data, and the projection lens projects the image light output by the spatial light modulator to display a projected image.
However, in the conventional projection system, when the color wheel emits time-series light, the adjacent area of the color wheel between the segment areas generates two colors of light, which hinders improvement of image display quality, and in order to solve the problem, in the prior art, the light source is generally turned off in the spoke area, so that light is not emitted from the spoke area, but the turn-off period of the light source is very short, which has a very high requirement on the light source, and is theoretically feasible, but in actual operation, the light source cannot respond quickly, and a spoke effect also occurs, which affects the projection image quality of the projection system.
Disclosure of Invention
In order to solve the technical problem that the spoke effect influences the quality of a projected image in the prior art, the invention provides a projection system which can effectively improve the influence of the spoke effect on the quality of the projected image.
A projection system includes a light source, a color wheel, and a spatial light modulator. The light source is used for emitting light source light; the color wheel is positioned on a light path where light source light emitted by the light source is positioned, the color wheel comprises at least two segment areas, the at least two segment areas respectively receive the light source light and correspondingly emit at least two colors of light, the period from the beginning to the end of the light spot formed by the light source light irradiating on the color wheel spanning the two segment areas is a spoke period, and the area irradiated by the light spot in the spoke period forms a spoke area; the spoke area is divided into two sections which are respectively positioned in two adjacent subsection areas, the area outside the spoke area contained in one subsection area forms a non-spoke area, and the period of the light spot irradiating on one non-spoke area is a non-spoke period; the spatial light modulator is used for modulating the at least two colors of light according to image data to generate projection light required by a projection image, and the spatial light modulator is turned off in the spoke period.
In one embodiment, the light source is turned off during both of the spoke periods.
In one embodiment, the light source enters an off-process period at the beginning of the spoke period and enters an on-process period before the beginning of the next non-spoke period.
In one embodiment, the light source enters an off-process period, a fully off period, and an on-process period in sequence during the spoke period, and the light source enters a fully on period during the non-spoke period.
In one embodiment, the light source enters an off-process period during a non-spoke period prior to the beginning of the spoke period and enters an on-process period at the beginning of the next non-spoke period.
In one embodiment, the light source enters an on-process period, a fully on period, and an off-process period in sequence during the non-spoke period, the light source entering a fully off period during the spoke period.
In one embodiment, the light source is turned on during the spoke period.
In one embodiment, the driving currents of the light source in two adjacent non-spoke periods are different and are respectively a first driving current and a second driving current, and the driving current of the light source is adjusted at the beginning of the spoke period and transits from the first driving current to the second driving current.
In one embodiment, the color wheel includes a first segment region, a second segment region and a third segment region, the first segment region, the second segment region and the third segment region are sequentially arranged in a circumferential direction, the color wheel includes a first spoke region between a non-spoke region of the first segment region and a non-spoke region of the second segment region, a second spoke region between a non-spoke region of the second segment region and a non-spoke region of the third segment region, and a third spoke region between a non-spoke region of the third segment region and a non-spoke region of the first segment region, driving currents of the light source in non-spoke periods corresponding to the non-spoke regions of the three segment regions are different from each other, and are the first driving current, the second driving current and the third driving current, respectively, the driving current of the light source is adjusted at a beginning of the spoke period, and the driving current of the light source is changed from the first driving current to the second driving current in the spoke period corresponding to the first spoke region, the driving current of the light source is changed from the second driving current to the third driving current in the spoke period corresponding to the second spoke region, and the driving current of the light source is changed from the third driving current to the first driving current in the spoke period corresponding to the third spoke region.
In one embodiment, the non-spoke region of the first segment region receives the light source light and emits blue light, the second segment region carries a red wavelength conversion material, and the non-spoke region of the second segment region receives the light source light and emits red light, the third segment region carries a yellow wavelength conversion material, and the non-spoke region of the third segment region receives the light source light and emits yellow light, the first driving current is greater than the second driving current, and the third driving current is greater than the second driving current and less than the first driving current.
Compared with the prior art, in the projection system, the spatial light modulator is turned off in the spoke period, so that the light generated by the image in the spoke period is prevented from being modulated by the spatial light modulator to become modulated light to influence the image quality, and the quality of the projected image of the projection system can be improved. Further, in one embodiment, the spatial light modulator is only turned off during the spoke period, thus controlling in the simplest way to change the quality of the image display.
Drawings
Fig. 1 is a schematic structural diagram of a projection system according to a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of the color wheel shown in fig. 1.
Fig. 3 to 5 are schematic structural diagrams of the color wheel modification embodiment shown in fig. 1.
FIG. 6 is a timing diagram illustrating driving of the light source and the spatial light modulator of the projection system of FIG. 1.
FIG. 7 is a timing diagram illustrating the driving of the light source and the spatial light modulator of the projection system according to the second embodiment of the present invention.
Fig. 8 is a timing diagram illustrating driving of the light source and the spatial light modulator of the projection system according to the third embodiment of the present invention.
Fig. 9 is a schematic diagram of the driving timing of the light source and the spatial light modulator of the projection system according to the fourth embodiment of the present invention.
Fig. 10 is a schematic view of a color wheel of a projection system according to a fourth embodiment of the present invention.
Description of the main elements
Color wheel driving device 130
Image DATA
Part of the spoke region 141b
Spoke regions 142, 442a, 442b
Non-spoke regions 141a, 441a
Opening process time period t1
Closing process time period t2
Full on period t3
Full off period t4
Color wheel period T
Non-spoke period T1
Spoke periods T2, T2', T2 "
Drive currents I1, I2, I3
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
First embodiment
Referring to fig. 1, fig. 1 is a schematic structural diagram of a projection system 100 according to a first embodiment of the invention. The projection system 100 includes a light source controller 110, a light source 120, a color wheel driving device 130, a color wheel 140, a controller 150, a spatial light modulator 160, and a projection lens 170. The light source controller 110 is configured to drive the light source 120 to emit light, the color wheel driving device 130 is configured to drive the color wheel 140 to move, the color wheel 140 is configured to receive light emitted by the light source 120 and emit at least two color lights, the spatial light modulator 160 is configured to perform image modulation on the at least two color lights according to image DATA to generate image light, and the projection lens 170 is configured to perform projection according to the image light to display a projection image. The controller 150 is configured to control the on and off timings of the light source controller 110 for the light source 120, the driving speed of the color wheel driving device 130, and the modulation timing of the spatial light modulator 160 to be suitable for the three.
Specifically, the light source controller 110 is configured to control the light source 120 to be turned on and off, the light source 120 is configured to receive a driving signal emitted by the light source controller 110 and emit light source light, such as blue light source light, and the light source 120 may be a blue light source. In a modified embodiment, the light source 120 may be a light source of another color, not limited to a blue light source, and the light source 120 may be an ultraviolet light source to emit ultraviolet light source light, for example. Further, the light source 120 may be a semiconductor diode laser light source for providing high-brightness light source light.
Referring to fig. 2, fig. 2 is a schematic structural diagram of the color wheel 140 shown in fig. 1. The color wheel 140 is located on a light path where light source light emitted by the light source 120 is located, the color wheel 140 includes at least two segment regions 141, at least one segment region 141 of the at least two segment regions 141 carries a wavelength conversion material, the at least two segment regions 141 receive the light source light and correspondingly emit at least two color lights, at least one of the at least two color lights is converted light generated by the wavelength conversion material excited by the light source light, and each segment region 141 emits one of the at least two color lights. The color wheel driving device 130 is configured to drive the color wheel 140 to move, so that the at least two segment areas 141 are periodically located on the light path where the light source light is located and emit the at least two color lights correspondingly and periodically.
It is to be understood that, in an alternative embodiment, the light source 120 may also be a white light source, and the at least two segment regions 141 of the color wheel 140 may be filter regions carrying filter materials for filtering out a color light in the white light so that the at least two segment regions 141 receive the light source light and emit at least two colors of light correspondingly.
In this embodiment, the at least two segment regions 141 are arranged along a circumferential direction, and the color wheel driving device 130 drives the color wheel 140 to rotate along the center of the color wheel 140, so that the at least two segment regions 141 are periodically located on the optical path where the light source light is located, and the at least two segment regions 141 periodically emit the at least two color lights. It is understood that the sizes of the at least two segment regions 141 can be set to be the same or different according to actual needs.
Further, the period from when the light source light emitted by the light source 120 irradiates the light spot formed on the color wheel 140 and crosses two adjacent segment areas 141 to when the light spot crosses two adjacent segment areas 141 is a spoke period, and the area irradiated by the light spot in the spoke period forms a spoke area 142; one spoke region 142 is divided into two spoke regions 141b located adjacent to each other, and the spoke region 141b included in one of the spoke regions 141b constitutes one non-spoke region 141a, and the period over which the light spot is irradiated onto one non-spoke region 141a is one non-spoke period. That is, each of the segment regions 141 includes a non-spoke region 141a and a partial spoke region 141b, and two partial spoke regions 141b between the non-spoke regions 141a of adjacent two segment regions 141 constitute the spoke region 142.
As shown in fig. 2, in the present embodiment, the color wheel 140 includes three segment regions 141 sequentially arranged in a circumferential direction, which are a first segment region B, a second segment region R, and a third segment region G. The first segment region B is used for emitting a first color light, such as blue light, when the light source 120 is a blue light source, a scattering material may be disposed on the first segment region R, and the light emitted by the light source 120 may be emitted after being scattered by the first segment region B; when the light source 120 is an ultraviolet light source, a first wavelength conversion material may be disposed on the first segment region B, and light emitted from the light source 120 may excite the first wavelength conversion material to generate the first color light. The second segment region R is configured to emit a second color light, such as a red light, and a second wavelength conversion material, such as a red phosphor, may be disposed on the second segment region R, and the light emitted from the light source 120 may excite the second wavelength conversion material to generate the second color light, i.e., the red light; the third segment region G is used for emitting a third color light, such as green light, and a third wavelength conversion material, such as green phosphor, may be disposed on the third segment region G, and the light emitted from the light source 120 may excite the third wavelength conversion material to generate the third color light, i.e., green light.
Further, in the embodiment shown in fig. 2, the first segmented region B, the second segmented region R and the third segmented region G each include a non-spoke region 141a and a partial spoke region 141B adjacent to another segmented region. Wherein two partial spoke regions 141B between the non-spoke regions 141a of the first and second segment regions B and R may be defined as first spoke regions; two partial spoke regions 141b between the second segmented region R and the non-spoke region 141a of the third segmented region G may be defined as second spoke regions; two partial spoke regions 141B between the third segmented region G and the non-spoke region 141a of the first segmented region B may be defined as third spoke regions. It is to be understood that the terms "first", "second" and "third" preceding the segmented regions are used for descriptive purposes only and do not specifically limit a certain region.
Further, as shown in fig. 3, in the first modified embodiment, the color wheel 140 may include two segment regions 141 sequentially arranged along the circumferential direction, namely, a first segment region B and a second segment region Y. The first segment region B is used for emitting a first color light, such as blue light, when the light source 120 is a blue light source, a scattering material may be disposed on the first segment region B, and the light emitted by the light source 120 may be emitted after being scattered by the first segment region B; when the light source 120 is an ultraviolet light source, a first wavelength conversion material may be disposed on the first segment region B, and light emitted from the light source 120 may excite the first wavelength conversion material to generate the first color light. The second segment Y is configured to emit a fourth color light, such as yellow light, and a fourth wavelength conversion material, such as yellow phosphor, may be disposed on the second segment Y, and the light emitted from the light source 120 may excite the fourth wavelength conversion material to generate the fourth color light, i.e., yellow light.
Further, in the embodiment shown in fig. 3, each of the first and second segment regions B and Y includes a non-spoke region 141a and a partial spoke region 141B adjacent to the other segment region 141. Wherein two partial spoke regions 141B between the non-spoke regions 141a of the first and second segment regions B and Y may be defined as first spoke regions; two other partial spoke regions 141B between the second segment region Y and the non-spoke region 141a of the first segment region B may be defined as second spoke regions.
Further, as shown in fig. 4, in the second modified embodiment, the color wheel 140 may include four segment regions B, R, G, Y, which are a first segment region B, a second segment region R, a third segment region G, and a fourth segment region Y, sequentially arranged in the circumferential direction. The first segment region B is used for emitting a first color light, such as blue light, when the light source 120 is a blue light source, a scattering material may be disposed on the first segment region B, and the light emitted by the light source 120 may be emitted after being scattered by the first segment region B; when the light source 120 is an ultraviolet light source, a first wavelength conversion material may be disposed on the first segment region B, and light emitted from the light source 120 may excite the first wavelength conversion material to generate the first color light. The second segment region R is configured to emit a second color light, such as a red light, and a second wavelength conversion material, such as a red phosphor, may be disposed on the second segment region R, and the light emitted from the light source 120 may excite the second wavelength conversion material to generate the second color light, i.e., the red light; the third segment region G is used for emitting a third color light, such as green light, and a third wavelength conversion material, such as green phosphor, may be disposed on the third segment region G, and the light emitted from the light source 120 may excite the third wavelength conversion material to generate the third color light, i.e., green light. The fourth segment Y is used for emitting a fourth color light, such as a yellow light, and a fourth wavelength conversion material, such as a yellow phosphor, may be disposed on the fourth segment Y, and the light emitted from the light source 120 may excite the fourth wavelength conversion material to generate the fourth color light, i.e., the yellow light.
Further, in the embodiment shown in fig. 4, the first, second, third and fourth segment regions B, R, G and Y each include a non-spoke region 141a and a partial spoke region 141B adjacent to another segment region. Two partial spoke regions 141b of two adjacent segment regions define the spoke region 142.
Further, as shown in fig. 5, in the third modified embodiment, the color wheel 140 may include six segment regions, namely, a first segment region B1, a second segment region B2, a third segment region R1, a fourth segment region R2, a fifth segment region G1 and a sixth segment region G2, which are sequentially arranged in the circumferential direction. The first segment region B1 and the second segment region B2 are used for emitting a first color light, such as blue light, when the light source 120 is a blue light source, scattering materials may be disposed on the first segment region B1 and the second segment region B2, and the light emitted by the light source 120 may be emitted after being scattered by the first segment region B1 and the second segment region B2; when the light source 120 is an ultraviolet light source, a first wavelength conversion material may be disposed on the first segment region B1 and the second segment region B2, and light emitted from the light source 120 may excite the first wavelength conversion material to generate the first color light. The third and fourth segmented regions R1 and R2 are used for emitting a second color light, such as red light, and a second wavelength conversion material, such as red phosphor, can be disposed on the third and fourth segmented regions R1 and R2, and the light emitted from the light source 120 can excite the second wavelength conversion material to generate the second color light, i.e., red light; the fifth segment region G1 and the sixth segment region G2 are used for emitting a third color light, such as green light, and the fifth segment region G1 and the sixth segment region G2 may be provided with a third wavelength conversion material, such as green phosphor, and the light emitted from the light source 120 may excite the third wavelength conversion material to generate the third color light, i.e., green light.
Further, in the embodiment shown in fig. 5, the first segmented region B1, second segmented region B2, third segmented region R1, fourth segmented region R2, fifth segmented region G1 and sixth segmented region G2 each include a non-spoke region and a partial spoke region adjacent to another segmented region. Two partial spoke regions 141b of two adjacent segment regions define the spoke region 142.
In this embodiment, the color wheel 140 is a transmissive color wheel, that is, the light of the light source 120 enters from one side of the color wheel 140, and the light of the at least two colors exits from the other side of the color wheel 140. However, it is understood that in a modified embodiment, the color wheel 140 may be a reflective color wheel, that is, the light of the light source 120 enters from one side of the color wheel, and the side of the color wheel 140 emits the light of the at least two colors. The spatial light modulator 160 may be a DMD modulator, but is not limited to a DMD modulator.
Referring to fig. 6, fig. 6 is a timing diagram illustrating driving of the light source 120 and the spatial light modulator 160 of the projection system 100 shown in fig. 1. First, the driving periods of the light source 120 are defined, and the driving periods of the light source 120 include an on-process period t1, an off-process period t2, a full-on period t3 and a full-off period t 4. Wherein the turn-on process period t1 is a period of time from the start of the application of the driving signal to the light source 120 until the light source 120 reaches a normal operation current to operate normally, the turn-off process period t2 is a period of time when the application of the driving signal to the light source 120 in operation is stopped until the driving current of the light source 120 drops to zero and is turned off completely, the turn-on complete period t3 is a period of time when the light source 120 reaches a normal operation current to operate normally, and the turn-off complete period t4 is a period of time when the driving current of the light source 120 is zero. It is understood that, during the on process period t1 and the off process period t2, the light source 120 may also emit light with a light intensity lower than that of the full on period t3 (i.e., during normal operation).
Second, a non-spoke period T1 and a spoke period T2 are defined. In each color wheel period (i.e., the time of one rotation of the color wheel), the corresponding time period of the non-spoke area 141a of each of the segment areas 141 is the non-spoke period T1, wherein the non-spoke area 141a of each of the segment areas 141 is located on the light path of the light emitted by the light source 120 during the non-spoke period T1, and the non-spoke area 141a of the segment area 141 corresponding to the color wheel 140 receives the light source light and emits one color light. The time period between two adjacent non-spoke periods T1 is the spoke period T2 corresponding to the spoke region 142, and it is understood that during the spoke period T2, the spoke region 142 is located on the optical path of the light emitted by the light source 120, but the light source 120 may not emit light during the spoke period T2.
Each color wheel cycle includes non-spoke periods T1 and spoke periods T2 arranged alternately, wherein the number of the non-spoke periods T1 and the spoke periods T2 is identical to the number of the non-spoke regions 141a and the spoke regions 142 of the segment region 141. When the number of the non-spoke periods T1 is two or more, the lengths of the two or more non-spoke periods T1 may be different.
In the embodiment shown in fig. 6, under the control of the light source controller 110 and the controller 150, the light source 120 and the spatial light modulator 160 are turned off during the spoke period. In detail, in the present embodiment, the light source 120 enters the off-process period T2 at the beginning of the spoke period T2 and enters the on-process period T1 before the beginning of the next non-spoke period T1. Specifically, the light source 120 enters the off-course period T2, the full off-course period T4 and the on-course period T1 in sequence during the spoke period T2, and the light source 120 enters the full on-course period T3 during the non-spoke period T1.
In the projection system 100, the spatial light modulator 160 is turned off during the spoke period T2, and the light generated by the image during the spoke period T2 is prevented from being modulated by the spatial light modulator 160 into modulated light to affect the image quality, so that the quality of the projected image of the projection system 100 can be improved compared with the prior art.
Further, in one embodiment, the light source 120 and the spatial light modulator 160 are both turned off during the spoke period T2, thereby ensuring image display quality and saving energy. Since the total duration of spoke period T2 is at least 1/20% of the duration of a color wheel cycle, the energy saving effect of projection system 100 is above 5%.
Second embodiment
Referring to fig. 7, fig. 7 is a timing diagram illustrating driving of a light source and a spatial light modulator of a projection system according to a second embodiment of the invention. The projection system of the second embodiment is substantially the same as the projection system of the first embodiment, that is, the description of the projection system of the first embodiment can also be substantially applied to the projection system of the second embodiment, and the main differences are as follows: the driving timings of the light sources are different. Specifically, in the second embodiment, the spatial light modulator is turned off during the spoke period T2 but the light source is still turned on during the spoke period T2.
In the second embodiment, only the spatial light modulator is turned off during the spoke period T2, and thus control is performed to change the quality of image display in the simplest manner.
Third embodiment
Referring to fig. 8, fig. 8 is a timing diagram illustrating driving of a light source and a spatial light modulator of a projection system according to a third embodiment of the invention. The projection system of the third embodiment is substantially the same as the projection system of the first embodiment, that is, the description of the projection system of the first embodiment can also be substantially applied to the projection system of the third embodiment, and the main differences are as follows: the driving timings of the light sources are different. Specifically, in the third embodiment, the light source enters the off-process period T2 in the non-spoke period T1 before the start of the spoke period T2, and enters the on-process period T1 at the start of the next non-spoke period T1. Specifically, as shown in fig. 7, the light source enters an on-process period T1, a full on-process period T3 and an off-process period T2 in sequence during the non-spoke period T1, and the light source enters a full off-process period T4 during the spoke period T2.
In the third embodiment, the light source is turned off immediately before the spoke period T2 begins and is turned on only in the next non-spoke period T1, so that the light source is completely turned off in the spoke period T2, thereby saving more energy.
Fourth embodiment
Referring to fig. 9, fig. 9 is a schematic diagram illustrating driving timing sequences of a light source and a spatial light modulator of a projection system according to a fourth embodiment of the invention. The projection system of the fourth embodiment is substantially the same as the projection system of the first embodiment, that is, the description of the projection system of the first embodiment can also be substantially applied to the projection system of the fourth embodiment, and the main differences are as follows: the driving timing sequence of the light source is different from the structure of the color wheel.
Referring to fig. 10, fig. 10 is a schematic structural diagram of the color wheel 440 according to the present embodiment. The color wheel 440 includes a first segment region B, a second segment region R, and a third segment region Y, which are sequentially arranged in a circumferential direction, the color wheel 440 includes a first spoke region 442a between a non-spoke region 441a of the first segment region B and a non-spoke region 441a of the second segment region R, a second spoke region 442B between the non-spoke region 441a of the second segment region R and a non-spoke region 441a of the third segment region Y, and a third spoke region 442c between the non-spoke region 441a of the third segment region Y and the non-spoke region 441a of the first segment region B.
Specifically, in the driving timing sequence of the light source of the projection system according to the fourth embodiment of the present invention, the driving currents of the light source in the non-spoke period T1 corresponding to the non-spoke region 441a of the three segment regions are different from each other and are the first driving current I1, the second driving current I2 and the third driving current I3, respectively, and the driving currents of the light source are adjusted at the beginning of the spoke period T2, and the driving current of the light source is transited from the first driving current I1 to the second driving current I2 during the spoke period T2 corresponding to the first spoke region 442a, the driving current of the light source is transited from the second driving current I2 to the third driving current I3 during the spoke period T2' corresponding to the second spoke region 442b, the driving current of the light source is changed from the third driving current I3 to the first driving current I1 during the spoke period T2 ″ corresponding to the third spoke region 442 c.
In this embodiment, the non-spoke region 441a of the first segment region B receives the light source light and emits blue light, the second segment region R carries red wavelength conversion material, the non-spoke region 441a of the second segment region R receives the light source light and emits red light, the third segment region Y carries yellow wavelength conversion material, the non-spoke region 441a of the third segment region Y receives the light source light and emits yellow light, the first driving current I1 is greater than the second driving current I2, and the third driving current I3 is greater than the second driving current I2 and less than the first driving current I1.
In the fourth embodiment, the driving current of the light source needs to be modulated according to different non-spoke periods T1, such as a high driving current during the non-spoke period T1 for emitting blue light, a low driving current during the non-spoke period T1' for emitting red light, and a higher driving current than red light during the non-spoke period for emitting yellow light. In one aspect, the adjustment of the driving current of the light source is performed during the spoke period T2, and since the spoke period T2 is relatively long, the response speed requirement for the light source is low. On the other hand, in the spoke period T2, the current modulation of the light source is completed during this period, and the spatial light modulator is in the off state, and the light emitted from the light source at the time of modulation is not light of a predetermined brightness, and no image light is output during this period, thereby making the image display effect better.
It is to be understood that, in a modified embodiment of the fourth embodiment, the color wheel may also adopt the color wheel shown in fig. 3, fig. 4 or fig. 5 or another color wheel with different segment structures, the driving currents of the light source are different in the non-spoke period T1 corresponding to the non-spoke region 441a of the n segment regions, n represents the number of segment regions, n is a natural number greater than or equal to 2, and the spoke period T2' corresponding to a certain spoke region 442b is transited from the second driving current of the previous non-spoke period to the first driving current of the next spoke period. For example, in a modified embodiment, when the color wheel shown in fig. 3 is used, the driving currents of the light source in the non-spoke period T1 corresponding to the non-spoke region 441a of the two segment regions are different from each other, namely, the first driving current I1 and the second driving current I2, the driving current of the light source is adjusted at the beginning of the spoke period T2, the driving current of the light source is transited from the first driving current I1 to the second driving current I2 in the spoke period T2 corresponding to the first spoke region 442a, and the driving current of the light source is transited from the second driving current I2 to the first driving current I1 in the spoke period T2' corresponding to the second spoke region 442 b. In addition, it is believed that those skilled in the art can understand the variation of the driving current for the embodiment where n is equal to 4 or 6, and the description thereof will not be repeated here.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. A projection system comprising a light source, a color wheel and a spatial light modulator, wherein:
the light source is used for emitting light source light;
the color wheel is positioned on a light path where light source light emitted by the light source is positioned, the color wheel comprises at least two segment areas, the at least two segment areas respectively receive the light source light and correspondingly emit at least two colors of light, the period from the beginning to the end of the light spot formed by the light source light irradiating on the color wheel spanning the two segment areas is a spoke period, and the area irradiated by the light spot in the spoke period forms a spoke area; the spoke area is divided into two sections which are respectively positioned in two adjacent subsection areas, the area outside the spoke area contained in one subsection area forms a non-spoke area, and the period of the light spot irradiating on one non-spoke area is a non-spoke period;
the spatial light modulator is used for modulating the at least two colors of light according to image data to generate projection light required by a projection image, the spatial light modulator is turned off in the spoke period, and the light source is turned off or turned on in the spoke period;
when the light source is turned on in the spoke period, the driving currents of the light source in two adjacent non-spoke periods are different and are respectively a first driving current and a second driving current, the driving current of the light source is adjusted in the whole spoke period, and the first driving current is gradually transited to the second driving current;
the light source is turned off during the spoke period:
the light source enters a turn-off process period at the beginning of the spoke period and enters a turn-on process period before the beginning of the next non-spoke period; or
The light source enters an off-process period during a non-spoke period prior to the beginning of the spoke period and enters an on-process period at the beginning of the next non-spoke period.
2. The projection system of claim 1, wherein: when the light source enters a turn-off process period at the beginning of the spoke period, the light source sequentially enters a turn-off process period, a full turn-off period, and a turn-on process period in the spoke period, and the light source enters a full turn-on period in the non-spoke period.
3. The projection system of claim 1, wherein: when the light source enters a turn-off process period in a non-spoke period before the spoke period begins, the light source sequentially enters a turn-on process period, a full turn-on period and a turn-off process period in the non-spoke period, and the light source enters a full turn-off period in the spoke period.
4. The projection system of claim 1, wherein: when the light source is turned on in the spoke period, the color wheel comprises a first subsection area, a second subsection area and a third subsection area, the first subsection area, the second subsection area and the third subsection area are sequentially arranged in the circumferential direction, the color wheel comprises a first spoke area positioned between a non-spoke area of the first subsection area and a non-spoke area of the second subsection area, a second spoke area positioned between a non-spoke area of the second subsection area and a non-spoke area of the third subsection area, and a third spoke area positioned between a non-spoke area of the third subsection area and a non-spoke area of the first subsection area, driving currents of the light source in the non-spoke periods corresponding to the non-spoke areas of the three subsection areas are different, and are respectively the first driving current, the second driving current and the third driving current, the driving current of the light source is adjusted at the beginning of the spoke period, the driving current of the light source is changed from the first driving current to the second driving current in the spoke period corresponding to the first spoke region, the driving current of the light source is changed from the second driving current to the third driving current in the spoke period corresponding to the second spoke region, and the driving current of the light source is changed from the third driving current to the first driving current in the spoke period corresponding to the third spoke region.
5. The projection system of claim 4, wherein: the non-spoke area of the first segmentation area receives the light source light and emits blue light, the second segmentation area carries a red wavelength conversion material, the non-spoke area of the second segmentation area receives the light source light and emits red light, the third segmentation area carries a yellow wavelength conversion material, the non-spoke area of the third segmentation area receives the light source light and emits yellow light, the first driving current is greater than the second driving current, and the third driving current is greater than the second driving current and less than the first driving current.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611236304.3A CN108255001B (en) | 2016-12-28 | 2016-12-28 | Projection system |
| PCT/CN2017/109335 WO2018121063A1 (en) | 2016-12-28 | 2017-11-03 | Projection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611236304.3A CN108255001B (en) | 2016-12-28 | 2016-12-28 | Projection system |
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| CN108255001B true CN108255001B (en) | 2021-07-09 |
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| CN111208697B (en) * | 2018-11-22 | 2021-07-27 | 中强光电股份有限公司 | Projection system and control method of driving current thereof |
| CN113015294A (en) * | 2019-12-19 | 2021-06-22 | 深圳光峰科技股份有限公司 | Current control circuit, method and projection equipment |
| CN113253554B (en) * | 2020-02-13 | 2022-11-08 | 中强光电股份有限公司 | Illumination system, illumination control method, and projection apparatus |
| CN113934091B (en) * | 2020-06-29 | 2023-12-01 | 中强光电股份有限公司 | Illumination system and projection device |
| CN113885279A (en) * | 2020-07-02 | 2022-01-04 | 深圳光峰科技股份有限公司 | Current control method, switching power supply circuit and projection equipment |
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| CN108255001A (en) | 2018-07-06 |
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