WO2019196428A1 - 投影系统 - Google Patents

投影系统 Download PDF

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Publication number
WO2019196428A1
WO2019196428A1 PCT/CN2018/118815 CN2018118815W WO2019196428A1 WO 2019196428 A1 WO2019196428 A1 WO 2019196428A1 CN 2018118815 W CN2018118815 W CN 2018118815W WO 2019196428 A1 WO2019196428 A1 WO 2019196428A1
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WO
WIPO (PCT)
Prior art keywords
light
state
micromirror
light source
lens
Prior art date
Application number
PCT/CN2018/118815
Other languages
English (en)
French (fr)
Inventor
郭祖强
杨炳柯
李屹
Original Assignee
深圳光峰科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 深圳光峰科技股份有限公司 filed Critical 深圳光峰科技股份有限公司
Publication of WO2019196428A1 publication Critical patent/WO2019196428A1/zh

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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
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3155—Modulator illumination systems for controlling the light source
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3164—Modulator illumination systems using multiple light sources

Definitions

  • the present invention relates to the field of projection technology, and in particular, to a projection system.
  • the projection system needs to combine the fluorescence and the laser light, and adjust the proportion of fluorescence and laser light, thereby realizing different color gamuts of the emitted light.
  • the present invention provides a projection system for combining laser light and fluorescence on a digital micromirror device and dynamically adjusting the color gamut of the projected light.
  • a projection system includes a first light source, a second light source, a digital micromirror device, and a lens, wherein:
  • the first light source is configured to emit first light in a first direction
  • the second light source is configured to emit second light in a second direction
  • the digital micromirror device includes a plurality of micromirror units for modulating the first light and the second light;
  • TIR prism for guiding the first light and the second light onto a plurality of micromirror units of the digital micromirror device, and guiding light emitted by the plurality of micromirror units to the lens ;
  • control device electrically connected to the first light source, the second light source and the digital micromirror device, respectively, for controlling the first light source and the second light source to emit primary color light at the same timing; the control The apparatus is further for controlling a state of motion of the micromirror unit in the digital micromirror device to adjust a ratio of the first light and the second light incident into the lens.
  • control device controls the micromirror unit to be in a stop state, an open state or an off state
  • the micromirror unit When the control device controls the micromirror unit to be in the stop state, the micromirror unit reflects the first light and the second light to a position deviating from the lens; when the control device Controlling the micromirror unit to deflect the first light into the lens while controlling the micromirror unit to deflect to the open state, while reflecting the second light to a position deviating from the lens; When the control device controls the micromirror unit to deflect to the off state, the micromirror unit reflects the second light to the lens while reflecting the first light to a position deviating from the lens.
  • the micromirror unit when the micromirror unit is in the stop state, the micromirror unit faces the lens.
  • each of the color image light-emitting periods of the digital micro-mirror device includes three primary color frame image light-emitting periods, wherein each of the primary color frame image light-emitting periods includes a bright gray-scale period and a dark gray-scale period;
  • control device controls a state in which the micromirror unit is located outside the stop state
  • control device controls the micromirror unit to be in the stopped state.
  • control device controls and adjusts each micromirror unit in the open state and the off according to a color gamut range of each pixel in the projected image.
  • the proportion of state time is a grayscale period of the bright grayscale period.
  • each micromirror unit can also be located in a first deflection state and a second deflection state, wherein a deflection angle of each micromirror unit in the first deflection state is greater than 0 and less than or equal to a deflection angle of the open state a deflection angle of each of the micromirror units in the second deflection state being less than 0 and greater than or equal to a deflection angle of the stop state;
  • the control device controls and adjusts the corresponding micromirror unit in the first deflection state and the second deflection state according to the color gamut range of each pixel in the image data. Deflection angle.
  • control device controls the power of the first light and the second light to adjust the reflection of the micromirror unit into the lens The ratio of the first light to the second light.
  • control device controls the micromirror unit to reflect the first light incident on the lens, simultaneously controlling the first light source to emit the first light, and the second light source does not emit light;
  • control device controls the micromirror unit to reflect the second light incident on the lens, simultaneously controlling the first light source not to emit light, and the second light source to emit the second light;
  • both the first light source and the second light source are controlled to not emit light.
  • first light emitted by the first light source is orthogonal to the optical axis of the second light emitted by the second light source.
  • the TIR prism comprises four mutually shaped irregular shaped prism bodies, and a gap is disposed between the prism bodies.
  • first light and the second light are respectively incident from adjacent sides of the surface of the digital micromirror device, and the spot formed by the first light and the second light on the surface coincide.
  • the first light further includes fluorescence
  • the second light further includes laser light
  • the control device provided by the invention is used for controlling the motion state of the micromirror unit in the digital micromirror device to adjust the proportion of the first light and the second light incident into the lens, thereby realizing the dynamic adjustment of the projection system to project the projection light.
  • the color gamut is beneficial to improve the quality of the projected image.
  • 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 view showing another angle structure of the projection system shown in FIG. 1.
  • FIG. 3 is a schematic view showing a further partial partial structure of the projection system shown in FIG. 1.
  • FIG. 4 is a schematic view showing the position of an exit spot of the digital micromirror device shown in FIG. 1.
  • FIG. 5 is a schematic diagram showing a state of a micromirror unit of the digital micromirror device shown in FIG. 3 in a color period of a color image.
  • FIG. 6 is a schematic diagram showing a state in which the micromirror unit of the digital micromirror device shown in FIG. 3 modulates Rec. 709 and DCI color gamut projection light.
  • FIG. 7 is a schematic diagram of a state of a micromirror unit in a digital micromirror device according to a second embodiment of the present invention.
  • FIG. 8 is a timing diagram of power supply currents of the first light source and the second light source when the projection system 100 emits Rec. 709 and DCI color gamut images according to an embodiment of the present invention.
  • FIG. 9 is a schematic perspective view of the TIR prism 140 and the digital micromirror device 150 shown in FIG.
  • FIG. 10 is a schematic exploded view of the TIR prism shown in FIG. 9.
  • FIG. 10 is a schematic exploded view of the TIR prism shown in FIG. 9.
  • Fig. 11 is a view showing the optical path of the light beam guided by the TIR prism shown in Fig. 9.
  • Figure 12 is a schematic illustration of the optical path of the TIR prism shown in Figure 9 guiding another beam.
  • Figure 13 is a schematic view showing the optical path of the first light and the second light emitted from the TIR prism to the digital micromirror device.
  • Fig. 14 is a schematic cross-sectional view showing a beam of the first light and the second light shown in Fig. 13.
  • Projection system 100 First light source 110 Second light source 120 First light L1 Second light L2 Beam cross section r, s Rectangular area q illuminator 111, 121 Homogenizer 112, 122 Relay component 115, 125 TIR prism 140 First illuminating surface 141 Second illuminating surface 142 Digital micromirror device 150 Micromirror unit 151, 251 Modulation area p Lens 170 One frame color image light exit period T Red frame image light exit period T R Green frame image light exit period T G Blue frame image light exit period T B Bright gray period T nr Dark gray period T nrf T nrf
  • FIG. 1 is a schematic structural view of a projection system 100 according to a first embodiment of the present invention
  • FIG. 2 is another perspective structural view of the projection system 100 shown in FIG.
  • the projection system 100 provided by the embodiment of the present invention includes a first light source 110, a second light source 120, a TIR prism 140, a digital micromirror device (DMD) 150, a control device (not shown), and a lens 170.
  • the first light source 110 is configured to emit first light including a laser in a first direction
  • the second light source 120 is configured to emit second light including fluorescence in a second direction; wherein the first direction and the first The two directions are different.
  • the first light emitted by the first light source 110 is orthogonal to the optical axis of the second light emitted by the second light source 120.
  • the digital micromirror device 150 includes a plurality of micromirror units 151 (FIG. 3) for modulating the first light and the second light; the TIR prism 140 is configured to direct the first light and the second light To the plurality of micromirror units 151 of the digital micromirror device 150, and a portion of the light emitted by the plurality of micromirror units 151 is directed to the lens 170; the lens 170 emits projection light emitted from the projection system 100.
  • the first light source 110 includes an illuminant 111, a light homogenizing device 112, and a relay assembly 115.
  • the illuminant 111 includes a laser and emits a laser as the first light.
  • the illuminator 111 comprises a single laser, or an array of lasers.
  • the first source 110 includes a red laser and a green laser, or the first source 110 includes a red laser, a green laser, and a blue laser. It can be understood that the color and quantity of the laser in the illuminant 111 can be selected according to actual needs.
  • the homogenizing device 112 can include a homogenizing rod or a compound eye.
  • the homogenizing device 112 includes a protective housing and a light bar.
  • the protective casing forms an accommodating cavity having an opening at both ends, the light bar is located in the accommodating cavity, and the two ends of the accommodating cavity respectively expose the incident end and the exit end of the light bar; at least the protective casing
  • An elastic piece is disposed on one surface, a first end of the elastic piece is fixed on the protective casing, and a second end of the elastic piece extends toward the inside of the accommodating cavity and abuts against the light bar It is beneficial to avoid damage when the homogenizing device 112 is pressed by an external force.
  • the relay assembly 115 includes a plurality of lenses whose optical axes coincide to guide the first light to the TIR prism 140, and adjust an angle at which the first light is incident on the TIR prism 140 and a spot size.
  • the spot of the first light that is directed through the TIR prism 140 onto the digital micromirror device 150 covers the modulation region, and a portion of the light exiting the modulation region can be incident on the lens 170 through the TIR prism 140.
  • the modulation area is an area composed of the surface of the micromirror unit 151 in an operating state.
  • the spot of the first light coincides with the modulation area to facilitate improved light utilization.
  • a portion of the micromirror unit 151 in the digital micromirror device 150 can be selected for light modulation.
  • a scattering element can also be disposed in the first light source 110 to avoid the generation of a laser speckle phenomenon, such as a diffusion sheet.
  • the second light source 120 includes an illuminator 121, a light homogenizing device 122, and a relay assembly 125.
  • the main difference between the second light source 120 and the first light source 110 is that the illuminant 121 is used to emit fluorescence.
  • the illuminator 121 includes a color wheel that illuminates the phosphor on the color wheel with light from a laser or LED to produce a corresponding color of fluorescence.
  • illuminator 121 may comprise a light source of other forms having phosphors.
  • each specific solution applicable to the first light source 110 can also be correspondingly applied to the second light source 120, in order to save space and avoid repetition, here I won't go into details.
  • the existing laser-excited phosphor light source since the red light phosphor or the orange phosphor which generates red light has low excitation efficiency and the fluorescence spectrum generated at the same time is wide, it is necessary to filter the short wavelength with the corresponding filter. The light makes the red light more pure, which results in a very low red fluorescence efficiency. Therefore, for the projection system, the luminance of red light is a lower proportion of the overall brightness. At the same time, there is a gap between color coordinates and gamut standards such as REC.709 or DCI. Pure lasers have high color saturation and their color coordinates far exceed the gamut standard. Therefore, mixing red and orange fluorescence is an ideal solution to improve red brightness and color coordinates. It can be understood that the fluorescence emitted by the laser excitation phosphor source can also be mixed with the laser of other colors to improve the brightness and color coordinates of other color lights.
  • the control device is configured to control the digital micromirror device 150 to sequentially combine the first light and the second light, the first light including a laser, and the second light including fluorescence.
  • the control device is further configured to control a motion state of the micromirror unit 151 in the digital micromirror device 150 to adjust a ratio of the first light and the second light incident into the lens 170, thereby realizing dynamic adjustment of the projection light emitted by the projection system 100.
  • the manner in which the control device adjusts the motion state of the micromirror unit 151 includes: adjusting the time when the micromirror unit 151 is in different motion states or adjusting the deflection angle of the micromirror unit.
  • the control device is electrically connected to the first light source 110 and the second light source 120, respectively, for controlling the first light source 110 and the second light source 120 to emit primary color light at the same timing.
  • the first light source 110 and the second light source 120 respectively emit the first light and the second light according to the timing of red-green-blue.
  • the first light includes red light
  • the second light includes red light, green light, and blue light.
  • the first light source 110 emits light
  • the second light source 120 In the period in which blue light and green light are emitted, the first light source does not emit light.
  • the second light source 120 emits red light during a first period of the red light period and does not emit light for a second time period of the red light period, and the first light source 110 emits light only during the second period of time.
  • FIG. 3 is a schematic diagram showing a further perspective of the projection system 100 of FIG. 1.
  • FIG. 4 is a schematic diagram showing the position of the light micro-mirror device 150 shown in FIG.
  • the first light source 110 and the second light source 120 are omitted in FIG.
  • the control device adjusts the ratio of the first light to the second light incident into the lens 170 by adjusting the time during which the micromirror unit 151 is in different motion states.
  • the control device is electrically connected to the digital micromirror device 150, and controls each micromirror unit 151 to be in a flat state, an on state or an off state, and controls the micromirror unit 151 to be within a certain period of time. Stay in the above three states.
  • the micromirror unit 151 is not deflected when it is in the stop state, that is, the deflection angle is 0, the micromirror unit 151 is facing the lens 170; the deflection direction of the micromirror unit 151 is in the open state and the off state, and in the embodiment of the present invention, When the mirror unit 151 is in the on state, the deflection angle is greater than 0; when the micromirror unit 151 is in the off state, the deflection angle is less than zero.
  • the control device controls the micromirror unit 151 to be in the above three different states to selectively direct the first light or the second light to the lens 170.
  • the first light source 110 and the second light source 120 are respectively located in a direction orthogonal to the lens 170. It can be understood that the first light source 110 and the second light source 120 can also be disposed at other positions relative to the lens 170. Not limited to this.
  • the control device controls the micromirror unit 151 (FIG.
  • the micromirror unit 151 reflects the first light and the second light to a position A that is offset from the lens 170;
  • the micromirror unit 151 reflects the first light to the lens 170 while reflecting the second light to a position B that is offset from the lens 170;
  • the micromirror unit 151 reflects the second light to the lens 170 while reflecting the first light to a position C that is offset from the lens 170.
  • the control device is also used for the motion state of the micromirror unit 151 in the digital micromirror device 150 to adjust the ratio of the first light and the second light incident into the lens 170, thereby adjusting the laser light and fluorescence incident into the lens 170.
  • the ratio in turn, dynamically adjusts the color gamut of the projection light emitted by the projection system 100, which is beneficial to improving the quality of the projected image.
  • the first light further includes fluorescence
  • the illuminant 111 further includes a fluorescent light source.
  • the fluorescent light source may be a way for the laser light source to excite the fluorescent material to generate fluorescence.
  • the second light further comprises a laser
  • the illuminator 121 further comprises a laser.
  • both the first light and the second light comprise laser light and fluorescence
  • the illuminant 111 and the illuminant 121 both comprise a laser and a fluorescent light source.
  • the control device adjusts the ratio of the laser light to the fluorescence reflected to the lens 170, thereby dynamically adjusting the color gamut of the projection light emitted by the projection system 100.
  • FIG. 5 is a schematic diagram of a state in which the micromirror unit of the digital micromirror device 150 shown in FIG. 3 is in a color image light-emitting period T of one frame.
  • the first light source 110 and the second light source 120 emit primary light to the digital micromirror device 150 at the same timing.
  • the digital micromirror device 150 modulates the three primary colors of light in a time-sharing manner.
  • the one-frame color image light-emitting period T includes a red frame image light-emitting period T. R , green frame image light exit period T G and blue frame image light exit period T B .
  • each of the primary color frame image light exiting periods includes a bright grayscale period and a dark grayscale period.
  • the red frame image light exit period T R includes a bright gray scale period T nr and a dark gray scale period T nrf .
  • the micromirror unit 151 is in a state other than the stop state, in the present embodiment, the open state or the off state; in the dark gray scale period T nrf , the micro The mirror unit 151 is located in the stopped state.
  • the bright grayscale period T nr includes n gray scale periods T nr1 .
  • the control device controls and adjusts the corresponding micro according to the color gamut range of each pixel in the projected image, specifically, according to the color coordinates and brightness of each pixel.
  • the time ratio of the mirror unit in the open state and the off state is dynamically adjusted to adjust the ratio of the first light to the second light incident on the lens 170, thereby adjusting the color gamut of the projected light.
  • the micromirror unit 151 is located in the open state in the period R1 to guide the red primary color light emitted by the first light source 110 in the period R1 to the lens 170 (FIG. 3); the micromirror unit 151 is located in the period R2
  • the off state is described to guide the red primary light emitted by the second light source 120 during the period R2 to the lens 170.
  • FIG. 6 is a schematic diagram showing the state of the Rec. 709 and DCI gamut projection light modulated by the micromirror unit of the digital micromirror device 150 shown in FIG. Since the Rec. 709 and the DCI color gamut require different ratios of laser and fluorescence to be combined, the control device dynamically adjusts the ratio of the period R1 to the period R2 in a gray scale period T nr1 , thereby modulating the laser light incident on the lens 170 and The ratio of fluorescence is achieved by the transformation of the projected light in the Rec. 709 and DCI gamut. It can be understood that the above control method can also implement the transformation of the emitted light between other color gamuts, and is not limited thereto.
  • the red frame image light-emitting period T R is taken as an example for description. It can be understood that the green frame image light-emitting period T G and the blue-frame image light-emitting period T B can be adjusted by the same control method. Color gamut.
  • control device controls and adjusts the time ratio of the corresponding micromirror unit 151 in different states according to the color gamut range of each pixel in the projected image, thereby dynamically adjusting the first light incident into the lens 170 and
  • the ratio of the second light which in turn adjusts the color gamut of the projected light, is advantageous for improving the quality of the projected image.
  • FIG. 7 is a schematic diagram of a state of a micromirror unit 251 in a digital micromirror device according to a second embodiment of the present invention.
  • the control device controls the micromirror unit 251 to be further located in the first deflection state and the second deflection state, wherein the deflection angle of each micromirror unit in the first deflection state is greater than 0 and less than or equal to the opening
  • the deflection angle of the state, the deflection angle of each micromirror unit in the second deflection state is less than 0 and greater than or equal to the deflection angle of the stop state. That is, the first deflection state is a state between the open state and the stopped state, and the second deflected state is a state between the closed state and the stopped state.
  • the deflection angle of the open state is 12° and the deflection angle of the OFF state is -12°.
  • the deflection angle of the first deflection state is 12° and the deflection angle of the second deflection state is -5°.
  • the control device also controls the micromirror unit 251 to remain in the first deflected state and the second deflected state for a certain period of time. In each grayscale period, the control device controls and adjusts a deflection angle of the corresponding micromirror unit 251 in the first deflection state and the second deflection state according to a color gamut range of each pixel in the image data, Further, the ratio of the first light to the second light reflected into the lens is adjusted to realize dynamic adjustment of the gray scale and color gamut of the projection light.
  • each micromirror unit 251 in the first deflection state is to the deflection angle of the open state, the higher the utilization ratio of the first light by the micromirror unit 251, that is, the first light a larger proportion of the light energy is reflected to the lens; the closer the deflection angle of each micromirror unit 251 is in the second deflection state, the closer the deflection angle of the off state, the micromirror unit 251 is to the second light
  • the higher the utilization the greater the proportion of light energy in the second light is reflected to the lens.
  • the first direction and the second direction may be the same direction, and the first light and the incident light into the lens 170 can be controlled by controlling the deflection angle of the digital micromirror device 150 on the same side.
  • the second light ratio may be the same direction, and the first light and the incident light into the lens 170 can be controlled by controlling the deflection angle of the digital micromirror device 150 on the same side.
  • the control device in each grayscale period of each bright grayscale period, the control device further controls power of the first light and the second light, thereby adjusting the micromirror unit 151 to reflect to the lens
  • the ratio of the first light to the second light in 170 For example, when it is required to increase the proportion of the first light incident into the lens 170, the power of the first light is increased when the micromirror is in the open state, and specifically, the control device can pass A supply voltage or a supply current applied to the first light source 110 and the second light source 120 is controlled to control the power of the first light and the second light.
  • FIG. 8 is a timing diagram of current supply currents of a first light source and a second light source when a projection system emits a Rec. 709 and a DCI color gamut image according to an embodiment of the present invention.
  • the micromirror unit on the digital micromirror device 150 can only reflect illumination from one source while the other source is wasted.
  • the power supply mode of the first light source and the second light source may be modulated.
  • control device controls the micromirror unit to reflect the first light incident on the lens, simultaneously controlling the first light source to emit the first light, and the second light source does not emit light;
  • control device controls the micromirror unit to reflect the second light incident on the lens, simultaneously controlling the first light source not to emit light, and the second light source to emit the second light;
  • both the first light source and the second light source are controlled to not emit light.
  • control device controls the power source to supply current to the first light source and the second light source in a pulsed manner, and the micromirror unit 151 of the digital micromirror device 150 is reflective of the first light or In the state of the second light, current is supplied to the corresponding light source.
  • the duty cycle of the power supply also changes.
  • FIG. 9 is a schematic perspective view of the TIR prism 140 and the digital micromirror device 150 shown in FIG.
  • FIG. 10 is a schematic exploded view of the TIR prism shown in FIG. 9.
  • the TIR prism 140 has an irregular shape including four mutually shaped irregular shaped prism bodies, and a gap is provided between the prism bodies. In one embodiment, the gap is an air gap.
  • the surface of the TIR prism 140 includes a first light-emitting surface 141 and a second light-emitting surface 142. The plurality of light-incident surfaces are connected between the first light-emitting surface 141 and the second light-emitting surface 142.
  • the TIR prism 140 is disposed between the digital micro-mirror device 150, the lens 170, the first light source 110, and the second light source 120 (FIG. 1). Specifically, the first light-emitting surface 141 is disposed adjacent to the digital micro-mirror device 150, and the second light is emitted. Face 142 is disposed adjacent to lens 170.
  • FIG. 11 is a schematic diagram of the optical path of the guiding beam of the TIR prism 140 shown in FIG. Figure 12 is a schematic illustration of the optical path of the TIR prism 140 of Figure 9 directing another beam.
  • the light incident surface different from the first light and the second light is incident on the TIR prism 140 (FIG. 1).
  • the light beam is incident on the TIR prism 140 from different light incident surfaces, and then guided from the first light exit surface 141 to the digital micromirror device 150 via the TIR prism 140, and reflected by the digital micromirror device 150.
  • a light exit surface 141 is incident on the TIR prism 140, passes through the second light exit surface 142, and exits.
  • a portion of the beam exiting the TIR prism 140 can be incident on the lens 170 (FIG. 1), and another portion of the beam exiting the TIR prism 140 is offset from the lens 170.
  • FIG. 13 is a schematic diagram of optical paths of the first light and the second light emitted by the TIR prism 140 to the digital micromirror device 150.
  • Fig. 14 is a schematic cross-sectional view showing a beam of the first light and the second light shown in Fig. 13.
  • the surface of the digital micromirror device 150 has a rectangular shape and includes a rectangular modulation area p, which is divided into various specifications according to the aspect ratio.
  • the first light and the second light may be incident on the surface of the digital micromirror device 150 from different directions.
  • the first light L1 and the second light L2 are respectively incident from different sides of the length adjacent to the surface, as shown in FIG. 14, the beam cross section r of the first light L1, and The beam cross section s of the two light L2 has a different shape. And the spot formed by the first light L1 and the second light L2 on the surface coincides into a rectangular area q.
  • the rectangular region q covers the modulation region p, and in a preferred embodiment, the rectangular region q coincides with the modulation region p.
  • control device is configured to control the ratio of the first light and the second light reflected by the digital micromirror device 150 to the lens 170, thereby adjusting the ratio of the laser light and the fluorescence incident to the lens 170, thereby realizing Dynamically adjusting the color gamut of the projection light emitted by the projection system 100 is advantageous for improving the quality of the projected image.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)
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Abstract

本发明提供一种投影系统，包括：第一光源、第二光源、镜头、数字微镜器件、TIR棱镜及控制装置，所述控制装置分别与所述第一光源、所述第二光源及所述数字微镜器件电连接，用于控制所述第一光源与所述第二光源按照相同时序发出基色光，所述控制装置进一步用于控制所述数字微镜器件中微镜单元的运动状态，从而调整入射至所述镜头中的第一光和第二光的比例，从而调整入射至镜头中的激光与荧光的比例，进而实现动态调整投影系统出射投影光的色域，有利于提高投影图像画面质量。

Description

投影系统 技术领域
本发明涉及投影技术领域，尤其涉及一种投影系统。
背景技术
本部分旨在为权利要求书中陈述的本发明的具体实施方式提供背景或上下文。此处的描述不因为包括在本部分中就承认是现有技术。
在投影技术领域，利用激光器激发色轮上不同荧光粉色段以形成不同基色荧光，该方法具有光效高，光学扩展量小的优势，因此发展迅速，成为投影仪光源的理想选择。
在实际应用中，不同的场合对于投影系统的色域要求不一样，因此投影系统需要将荧光与激光进行合光，并调整荧光与激光的占比，从而实现出射光不同的色域。
发明内容
有鉴于此，本发明提供一种在数字微镜器件上对激光与荧光进行合光，并动态调整出射投影光色域的投影系统。
一种投影系统，包括第一光源、第二光源、数字微镜器件和镜头，其中：
所述第一光源用于沿第一方向发出第一光；
所述第二光源用于沿第二方向发出第二光；
所述数字微镜器件包括用于调制所述第一光与所述第二光的多个微镜单元；
TIR棱镜，用于将所述第一光与所述第二光引导至所述数字微镜器件的多个微镜单元上，以及将所述多个微镜单元出射的光线引导至所述镜头；及
控制装置，分别与所述第一光源、所述第二光源及所述数字微镜器件电连接，用于控制所述第一光源与所述第二光源按照相同时序发出基色光；所述控制装置进一步用于控制所述数字微镜器件中微镜单元的运动状态从而调整入射至所述镜头中的第一光和第二光的比例。
进一步地，所述控制装置调整所述微镜单元运动状态的方式包括：调整所述微镜单元位于不同运动状态的时间或调整所述微镜单元的偏转角度。
进一步地，所述控制装置控制所述微镜单元处于停状态、开状态或关状态；
当所述控制装置控制所述微镜单元位于所述停状态时，所述微镜单元将所述第一光及所述第二光均反射至偏离所述镜头的位置；当所述控制装置控制所述微镜单元偏转至所述开状态时，所述微镜单元将所述第一光反射至所述镜头，同时将所述第二光反射至偏离所述镜头的位置；当所述控制装置控制所述微镜单元偏转至所述关状态时，所述微镜单元将所述第二光反射至所述镜头，同时将所述第一光反射至偏离所述镜头的位置。
进一步地，当所述微镜单元位于所述停状态时，所述微镜单元正对所述镜头。
进一步地，所述数字微镜器件的每帧彩色图像出光时段中包括三基色帧图像出光时段，其中每一基色帧图像出光时段中，包括亮灰阶时段与暗灰阶时段；
在所述亮灰阶时段中，所述控制装置控制所述微镜单元位于所述停状态以外的状态；
在所述暗灰阶时段中，所述控制装置控制所述微镜单元位于所述停状态。
进一步地，在所述亮灰阶时段的一个灰阶时段中，所述控制装置根据投影图像中每个像素的色域范围，控制及调整每个微镜单元位于所述开状态及所述关状态时间占比。
进一步地，每个微镜单元还能位于第一偏转状态及第二偏转状 态，其中，每个微镜单元在所述第一偏转状态的偏转角大于0并小于等于所述开状态的偏转角，每个微镜单元在所述第二偏转状态的偏转角小于0并大于等于所述停状态的偏转角；
在亮灰阶时段的每个灰阶时段中，所述控制装置根据图像数据中每个像素的色域范围，控制及调整对应微镜单元处于所述第一偏转状态及所述第二偏转状态的偏转角度。
进一步地，每个微镜单元位于所述第一偏转状态时的偏转角越接近所述开状态的偏转角，则所述微镜单元对所述第一光的利用率越高；
每个微镜单元位于所述第二偏转状态时的偏转角越接近所述关状态的偏转角，则所述微镜单元对所述第二光的利用率越高。
进一步地，每个亮灰阶时段的每个灰阶时段中，所述控制装置还控制所述第一光与所述第二光的功率，从而调整所述微镜单元反射至所述镜头中的第一光与第二光的比例。
进一步地，当所述控制装置控制所述微镜单元反射所述第一光入射至所述镜头时，同时控制所述第一光源发出所述第一光，以及所述第二光源不发光；
当所述控制装置控制所述微镜单元反射所述第二光入射至所述镜头时，同时控制所述第一光源不发光，以及所述第二光源发出所述第二光；
当所述控制装置控制全部微镜单元均位于所述停状态时，同时控制所述第一光源及所述第二光源均不发光。
进一步地，所述第一光源发出的第一光，与所述第二光源发出的第二光的光轴正交。
进一步地，所述TIR棱镜包括4个相互拼接的不规则形状棱镜体，所述棱镜体之间设置有间隙。
进一步地，所述第一光与所述第二光分别从所述数字微镜器件表面相邻的两侧边入射，并且所述第一光与所述第二光在所述表面形成的光斑重合。
进一步地，所述第一光还包括荧光，及/或所述第二光还包括激 光。
本发明提供的控制装置用于控制所述数字微镜器件中微镜单元的运动状态从而调整入射至所述镜头中的第一光和第二光的比例，进而实现动态调整投影系统出射投影光的色域，有利于提高投影图像画面质量。
附图说明
为了更清楚地说明本发明实施例/方式技术方案，下面将对实施例/方式描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例/方式，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明第一实施方式提供的投影系统的结构示意图。
图2为图1所示的投影系统的另一角度结构示意图。
图3为图1所示的投影系统的又一角度局部结构示意图。
图4为图1所示的数字微镜器件出射光斑位置示意图。
图5为图3所示的数字微镜器件的微镜单元在一帧彩色图像出光时段中的状态示意图。
图6为图3所示的数字微镜器件的微镜单元调制Rec.709与DCI色域投影光的状态示意图。
图7为本发明第二实施方式提供的数字微镜器件中的一微镜单元的状态示意图。
图8为本发明实施方式中的投影系统100出射Rec.709及DCI色域图像时第一光源与第二光源的供电电流时序图。
图9为图1所示的TIR棱镜140与数字微镜器件150的立体结构示意图。
图10为图9所示的TIR棱镜的分解结构示意图。
图11为图9所示的TIR棱镜引导光束的光路示意图。
图12为图9所示的TIR棱镜引导另一光束的光路示意图。
图13为TIR棱镜出射的第一光与第二光入射至数字微镜器件的光路示意图。
图14为图13所示的第一光与第二光的光束截面示意图。
主要元件符号说明
投影系统 100
第一光源 110
第二光源 120
第一光 L1
第二光 L2
光束截面 r、s
矩形区域 q
发光体 111、121
匀光装置 112、122
中继组件 115、125
TIR棱镜 140
第一出光面 141
第二出光面 142
数字微镜器件 150
微镜单元 151、251
调制区域 p
镜头 170
一帧彩色图像出光时段 T
红色帧图像出光时段 T R
绿色帧图像出光时段 T G
蓝色帧图像出光时段 T B
亮灰阶时段 T nr
暗灰阶时段T nrf T nrf
灰阶时段 T nr1
时段 R1、R2
如下具体实施方式将结合上述附图进一步说明本发明。
具体实施方式
为了能够更清楚地理解本发明的上述目的、特征和优点，下面结合附图和具体实施方式对本发明进行详细描述。需要说明的是，在不冲突的情况下，本申请的实施方式及实施方式中的特征可以相互组合。
在下面的描述中阐述了很多具体细节以便于充分理解本发明，所描述的实施方式仅是本发明一部分实施方式，而不是全部的实施方式。基于本发明中的实施方式，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施方式，都属于本发明保护的范围。
除非另有定义，本文所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本文中在本发明的说明书中所使用的术语只是为了描述具体的实施方式的目的，不是旨在于限制本发明。
请参阅图1-图2，其中，图1为本发明第一实施方式提供的投影系统100的结构示意图，图2为图1所示的投影系统100的另一角度结构示意图。本发明实施方式提供的投影系统100包括：第一光源110、第二光源120、TIR棱镜140、数字微镜器件(Digital Micromirror Device，DMD)150、控制装置(图未示)及镜头170。其中，第一光源110用于沿第一方向发出包括激光的第一光；第二光源120，用于沿第二方向发出包括荧光的第二光；其中，所述第一方向与所述第二方向不同，在一种优选实施方式中，所述第一光源110发出的第一光，与所述第二光源120发出的第二光的光轴正交。数字微镜器件150包括用于调制所述第一光与所述第二光的多个微镜单元151(图3)；TIR棱镜140用于将所述第一光与所述第二光引导至数字微镜器件150的多个微镜单元151上，以及将所述多个微镜单元151出射的部分光线引导至镜头170；镜头170发出自投影系统100出射的投影光。
进一步地，第一光源110包括发光体111、匀光装置112及中继组件115。其中，发光体111包括激光器并发出激光作为所述第一光。可以理解的是，发光体111包括单个激光器，或激光器阵列。在一种实施方式中，第一光源110包括红色激光器与绿色激光器，或第一光源110包括红色激光器、绿色激光器及蓝色激光器。可以理解的是，发光体111中激光器的颜色与数量可以根据实际需要进行选择。
匀光装置112可以包括匀光棒或复眼。在一种实施方式中，匀光装置112包括：保护壳体和光棒。所述保护壳体形成两端具有开口的容置腔，所述光棒位于容置腔内且容置腔的两端开口分别露出光棒的入射端和出射端；所述保护壳体的至少一个面上设置有弹性片，所述弹性片的第一端固定于所述保护壳体上，所述弹性片的第二端向所述容置腔内部延伸且抵靠在所述光棒上，有利于避免匀光装置112受外力挤压时损坏。
在本实施方式中，中继组件115包括多个光轴重合的透镜，以将所述第一光引导至TIR棱镜140，以及调整所述第一光入射至TIR棱镜140的角度及光斑大小，使得经TIR棱镜140引导至数字微镜器件150上的第一光的光斑覆盖调制区域，以及所述调制区域出射的部分光线能够穿过TIR棱镜140入射至镜头170。所述调制区域为工作状态下的微镜单元151表面组成的区域。在一种优选实施方式中，第一光的光斑与所述调制区域重合，有利于提高光的利用率。在调制特定分辨率投影图像实施方式中，可选择数字微镜器件150中的一部分微镜单元151用于光调制。
可以理解的是，第一光源110中还可以设置散射元件以避免激光散斑现象的产生，比如散射片。
第二光源120包括发光体121、匀光装置122及中继组件125。第二光源120与第一光源110的主要区别在于，发光体121用于发出荧光。具体地，在一种实施方式中，发光体121包括色轮，采用激光或LED发出的光激发所述色轮上的荧光粉以产生对应颜色的荧光。可以理解的是，在其他实施方式中，发光体121可以包括具有荧光粉的其 他形式的光源。需要说明的是，在本发明的精神或基本特征的范围内，适用于第一光源110中的各具体方案也可以相应的适用于第二光源120中，为节省篇幅及避免重复起见，在此就不再赘述。
在现有的激光激发荧光粉光源中，由于产生红光的红光荧光粉或者橙光荧光粉激发效率较低，同时产生的荧光光谱较宽，还需配合相应的滤光片滤除短波长光使得红光更纯，这导致最终得到的红光荧光效率很低。因此对于投影系统而言，红光亮度在总体亮度中所占比例较低。同时色坐标与色域标准比如REC.709或者DCI存在差距。纯激光具有很高的色彩饱和度，其色坐标远超色域标准，因此，将红光激光和橙色荧光混合是一种改善红光亮度和色坐标的理想方案。可以理解的是，还可以将激光激发荧光粉光源出射的荧光与其他颜色的激光混合，以改善其他颜色光的亮度与色坐标。
所述控制装置用于控制数字微镜器件150对第一光与第二光进行时序合光，所述第一光包括激光，所述第二光包括荧光。所述控制装置进一步用于控制数字微镜器件150中微镜单元151的运动状态从而调整入射至镜头170中的第一光和第二光的比例，从而实现动态调整投影系统100出射投影光的色域。所述控制装置调整微镜单元151运动状态的方式包括：调整微镜单元151位于不同运动状态的时间或调整微镜单元的偏转角度。
具体地，所述控制装置分别与第一光源110、第二光源120电连接，用于控制第一光源110与第二光源120按照相同时序发出基色光。在一种实施方式中，第一光源110与第二光源120按照红-绿-蓝的时序分别发出第一光与第二光。在一种实施方式中，第一光包括红光，第二光包括红光、绿光及蓝光，则在第二光源120发出红光的时段中，第一光源110发光，在第二光源120发出蓝光及绿光的时段中，第一光源不发光。在一种实施方式中，第二光源120在红光时段中的第一时段发出红光，并在红光时段中的第二时段不发光，第一光源110仅在所述第二时段发光。
请参阅图3-图4，图3为图1所示的投影系统100的又一角度局 部结构示意图，图4为图1所示的数字微镜器件150出射光斑位置示意图。图3中省略了第一光源110与第二光源120。在本实施方式中，所述控制装置通过调整微镜单元151位于不同运动状态的时间从而调整入射至镜头170中的第一光与第二光的比例。所述控制装置与数字微镜器件150电连接，控制每个微镜单元151位于停(flat)状态、开(on)状态或关(off)状态，以及控制微镜单元151在一定时间段内保持于以上三个状态。微镜单元151位于停状态时不偏转，即偏转角为0，微镜单元151正对镜头170；微镜单元151位于开状态与关状态时的偏转方向相反，在本发明实施方式中，微镜单元151位于开状态时偏转角大于0；微镜单元151位于关状态时偏转角小于0。
如图4所示，所述控制装置控制微镜单元151位于上述三种不同的状态，以将所述第一光或所述第二光选择性引导至镜头170。在本实施方式中，第一光源110与第二光源120分别位于镜头170相互正交的方向上，可以理解的是，第一光源110与第二光源120还可以相对于镜头170设置于其他位置，并不以此为限。当所述控制装置控制微镜单元151(图3)位于所述停状态时，微镜单元151将所述第一光及所述第二光均反射至偏离镜头170的位置A；当所述控制装置控制微镜单元151偏转至所述开状态时，微镜单元151将所述第一光反射至镜头170，同时将所述第二光反射至偏离镜头170的位置B；当所述控制装置控制微镜单元151偏转至所述关状态时，微镜单元151将所述第二光反射至镜头170，同时将所述第一光反射至偏离镜头170的位置C。
所述控制装置还用于数字微镜器件150中微镜单元151的运动状态从而调整入射至镜头170中的第一光和第二光的比例，从而调整入射至镜头170中的激光与荧光的比例，进而实现动态调整投影系统100出射投影光的色域，有利于提高投影图像画面质量。
可以理解的是，在一种实施方式中，第一光还包括荧光，相应地，发光体111还包括荧光光源，具体地，所述荧光光源可以为激光光源激发荧光材料而产生荧光的方式。在一种实施方式中，第二光还包括 激光，相应地，发光体121还包括激光器。在一种实施方式中，第一光与第二光均包括激光及荧光，发光体111与发光体121均包括激光器及荧光光源。所述控制装置调配反射至镜头170的激光与荧光的比例，进而实现动态调整投影系统100出射投影光的色域。
具体地，请参阅图5，为图3所示的数字微镜器件150的微镜单元在一帧彩色图像出光时段T的状态示意图。第一光源110与第二光源120按照相同时序出射基色光至数字微镜器件150，数字微镜器件150分时对三基色光进行调制，一帧彩色图像出光时段T包括红色帧图像出光时段T R、绿色帧图像出光时段T G及蓝色帧图像出光时段T B。其中，每一基色帧图像出光时段中，包括亮灰阶时段与暗灰阶时段。对于能够产生n个灰阶的数字微镜器件150来说，红色帧图像出光时段T R中包括亮灰阶时段T nr与暗灰阶时段T nrf。在亮灰阶时段T nr中，微镜单元151位于所述停状态以外的状态，在本实施方式中为所述开状态或所述关状态；在暗灰阶时段T nrf中，所述微镜单元151位于所述停状态。
进一步地，亮灰阶时段T nr包括n个灰阶时段T nr1。在亮灰阶时段T nr的一个灰阶时段T nr1中，所述控制装置根据投影图像中每个像素的色域范围，具体地，根据每个像素的色坐标与亮度，控制及调整对应微镜单元位于所述开状态及所述关状态的时间占比，从而动态调整入射至镜头170中的第一光与第二光的比例，进而调节出射投影光的色域。具体地，微镜单元151在时段R1中位于所述开状态，以将第一光源110在时段R1发出的红基色光引导至镜头170(图3)；微镜单元151在时段R2中位于所述关状态，以将第二光源120在时段R2发出的红基色光引导至镜头170。
请结合图5进一步参阅图6，为图3所示的数字微镜器件150的微镜单元调制Rec.709与DCI色域投影光的状态示意图。由于Rec.709与DCI色域需要不同比例的激光与荧光进行合光，所述控制装置动态调整一灰阶时段T nr1中时段R1与时段R2的比例，从而调配入射至镜头170中的激光与荧光的比例，实现所述投影光在Rec.709与DCI色 域的变换。可以理解的是，应用上述控制方法还可以实现出射光在其他色域之间的变换，并不以此为限。另外，本发明实施方式中均以红色帧图像出光时段T R为例进行说明，可以理解的是，对于绿色帧图像出光时段T G与蓝色帧图像出光时段T B可以采用相同的控制方法调整色域。
本实施方式中，所述控制装置根据投影图像中每个像素的色域范围，控制及调整对应微镜单元151位于不同状态的时间占比，从而动态调整入射至镜头170中的第一光与第二光的比例，进而调节出射投影光的色域，有利于提高投影图像质量。
请参阅图7，为本发明第二实施方式提供的数字微镜器件中一微镜单元251的状态示意图。本实施方式中，控制装置控制微镜单元251还能位于第一偏转状态及第二偏转状态，其中，每个微镜单元在所述第一偏转状态的偏转角大于0并小于等于所述开状态的偏转角，每个微镜单元在第二偏转状态的偏转角小于0并大于等于所述停状态的偏转角。即第一偏转状态是介于所述开状态与所述停状态之间的一个状态，所述第二偏转状态是介于所述关状态与所述停状态之间的一个状态。
一种实施方式中，开状态的偏转角为12°，关状态的偏转角为-12°。相应地，0°＜第一偏转状态的偏转角≤12°，0°＞第二偏转状态的偏转角≥-12°。在一种实施方式中，第一偏转状态的偏转角为12°，第二偏转状态的偏转角为-5°。
所述控制装置还控制微镜单元251在一特定时段中保持于所述第一偏转状态及所述第二偏转状态。在每个灰阶时段中，所述控制装置根据图像数据中每个像素的色域范围，控制及调整对应微镜单元251处于所述第一偏转状态及所述第二偏转状态的偏转角度，进而调配反射至镜头中的第一光与第二光的比例，实现投影光灰阶及色域的动态调整。
每个微镜单元251位于所述第一偏转状态时的偏转角越接近所述开状态的偏转角，则微镜单元251对所述第一光的利用率越高，即将 所述第一光中更大比例的光能反射至镜头；每个微镜单元251位于所述第二偏转状态时的偏转角越接近所述关状态的偏转角，则微镜单元251对所述第二光的利用率越高，即将所述第二光中更大比例的光能反射至所述镜头。
在本实施方式中，所述第一方向与所述第二方向可以为相同的方向，通过控制数字微镜器件150在同一侧的的偏转角度即可实现控制入射至镜头170中第一光和第二光比例。
需要说明的是，在本发明的精神或基本特征的范围内，适用于第一实施方式中的各具体方案也可以相应的适用于第二实施方式中，为节省篇幅及避免重复起见，在此就不再赘述。
在一种实施方式中，每个亮灰阶时段的每个灰阶时段中，所述控制装置还控制所述第一光与所述第二光的功率，从而调整微镜单元151反射至镜头170中的第一光与第二光的比例。比如，当需要增大入射至镜头170中的第一光的比例时，则在所述微镜位于所述开状态时增大所述第一光的功率，具体地，所述控制装置可以通过控制加载至第一光源110与第二光源120的供电电压或供电电流来控制所述第一光与所述第二光的功率。
请参阅图8，为本发明实施方式中的投影系统出射Rec.709及DCI色域图像时第一光源与第二光源的供电电流时序图。对于双光源的投影系统，数字微镜器件150上的微镜单元只能反射来自一个光源的照明光，而另一光源的光则被浪费掉了。为了提高本发明实施方式中投影系统的整体效率，可以对所述第一光源与所述第二光源的供电方式进行调制。
当所述控制装置控制所述微镜单元反射所述第一光入射至所述镜头时，同时控制所述第一光源发出所述第一光，以及所述第二光源不发光；
当所述控制装置控制所述微镜单元反射所述第二光入射至所述镜头时，同时控制所述第一光源不发光，以及所述第二光源发出所述第二光；
当所述控制装置控制所述微镜单元均位于所述停状态时，同时控制所述第一光源及所述第二光源均不发光。
在一种实施方式中，控制装置控制电源采用脉冲的方式为所述第一光源及所述第二光源提供电流，且在所述数字微镜器件150的微镜单元151处于反射第一光或第二光的状态时，才给对应的光源提供电流。对于不同的色域模式，所述电源供电的占空比也随之改变。
请结合图1进一步参阅图9-10，图9为图1所示的TIR棱镜140与数字微镜器件150的立体结构示意图。图10为图9所示的TIR棱镜的分解结构示意图。TIR棱镜140呈不规则形状包括4个相互拼接的不规则形状棱镜体，所述棱镜体之间设置有间隙。在一种实施方式中，所述间隙为空气隙。TIR棱镜140表面包括相对设置的第一出光面141及第二出光面142，其中，第一出光面141与第二出光面142之间连接有多个入光面。TIR棱镜140设置于数字微镜器件150、镜头170、第一光源110及第二光源120之间(图1)，具体地，第一出光面141与数字微镜器件150邻近设置，第二出光面142与镜头170邻近设置。
请结合图1参阅图11-12，图11为图9所示的TIR棱镜140引导光束的光路示意图。图12为图9所示的TIR棱镜140引导另一光束的光路示意图。所述第一光与所述第二光分别不同的入光面入射至TIR棱镜140(图1)。如图11-12所示，光束从不同入光面入射至TIR棱镜140后，经TIR棱镜140引导从第一出光面141出射至数字微镜器件150，经数字微镜器件150反射后自第一出光面141入射至TIR棱镜140，穿过第二出光面142后出射。TIR棱镜140出射的一部分光束能够入射至镜头170(图1)，TIR棱镜140出射的另一部分光束偏离镜头170。
请参阅图13-14，图13为TIR棱镜140出射的第一光与第二光入射至数字微镜器件150的光路示意图。图14为图13所示的第一光与第二光的光束截面示意图。数字微镜器件150表面呈矩形，并包括呈矩形的调制区域p，根据长宽比划分有多种规格。所述第一光与所述 第二光可以从不同的方向入射至数字微镜器件150表面。
优选地，如图13所示，第一光L1与第二光L2分别从所述表面相邻的长度不同两侧边入射，如图14所示，第一光L1的光束截面r，与第二光L2的光束截面s形状不同。并且第一光L1与第二光L2在所述表面形成的光斑重合为矩形区域q。以保证DMD150接收照明光的均匀性，在一种优选实施方式中，矩形区域q覆盖调制区域p，在一种优选实施方式中，矩形区域q与调制区域p重合。
本发明实施方式中，所述控制装置用于控制数字微镜器件150反射至镜头170中的第一光与第二光的比例，从而调整入射至镜头170中的激光与荧光的比例，进而实现动态调整投影系统100出射投影光的色域，有利于提高投影图像画面质量。
对于本领域技术人员而言，显然本发明不限于上述示范性实施方式的细节，而且在不背离本发明的精神或基本特征的情况下，能够以其他的具体形式实现本发明。因此，无论从哪一点来看，均应将实施方式看作是示范性的，而且是非限制性的，本发明的范围由所附权利要求而不是上述说明限定，因此旨在将落在权利要求的等同要件的含义和范围内的所有变化涵括在本发明内。不应将权利要求中的任何附图标记视为限制所涉及的权利要求。此外，显然“包括”一词不排除其他单元或步骤，单数不排除复数。装置权利要求中陈述的多个装置也可以由同一个装置或系统通过软件或者硬件来实现。第一，第二等词语用来表示名称，而并不表示任何特定的顺序。
最后应说明的是，以上实施方式仅用以说明本发明的技术方案而非限制，尽管参照较佳实施方式对本发明进行了详细说明，本领域的普通技术人员应当理解，可以对本发明的技术方案进行修改或等同替换，而不脱离本发明技术方案的精神和范围。

Claims (14)

  1. 一种投影系统，包括第一光源、第二光源数字微镜器件和镜头，其特征在于，
    所述第一光源用于沿第一方向发出第一光；
    所述第二光源用于沿第二方向发出第二光；
    所述数字微镜器件包括用于调制所述第一光与所述第二光的多个微镜单元；
    TIR棱镜，用于将所述第一光与所述第二光引导至所述数字微镜器件的多个微镜单元上，以及将所述多个微镜单元出射的光线引导至所述镜头；及
    控制装置，分别与所述第一光源、所述第二光源及所述数字微镜器件电连接，用于控制所述第一光源与所述第二光源按照相同时序发出基色光；所述控制装置进一步用于控制所述数字微镜器件中微镜单元的运动状态从而调整入射至所述镜头中的第一光和第二光的比例。
  2. 如权利要求1所述的投影系统，其特征在于，所述控制装置调整所述微镜单元运动状态的方式包括：调整所述微镜单元位于不同运动状态的时间或调整所述微镜单元的偏转角度。
  3. 如权利要求2所述的投影系统，其特征在于，所述控制装置控制所述微镜单元处于停状态、开状态或关状态；
    当所述控制装置控制所述微镜单元位于所述停状态时，所述微镜单元将所述第一光及所述第二光均反射至偏离所述镜头的位置；当所述控制装置控制所述微镜单元偏转至所述开状态时，所述微镜单元将所述第一光反射至所述镜头，同时将所述第二光反射至偏离所述镜头的位置；当所述控制装置控制所述微镜单元偏转至所述关状态时，所述微镜单元将所述第二光反射至所述镜头，同时将所述第一光反射至偏离所述镜头的位置。
  4. 如权利要求3所述的投影系统，其特征在于，所述微镜单元位于所述停状态时，所述微镜单元正对所述镜头。
  5. 如权利要求3所述的投影系统，其特征在于，所述数字微镜器件的每帧彩色图像出光时段中包括三基色帧图像出光时段，其中每一基色帧图像出光时段中，包括亮灰阶时段与暗灰阶时段；
    在所述亮灰阶时段中，所述控制装置控制所述微镜单元位于所述停状态以外的状态；
    在所述暗灰阶时段中，所述控制装置控制所述微镜单元位于所述停状态。
  6. 如权利要求5所述的投影系统，其特征在于，在所述亮灰阶时段的一个灰阶时段中，所述控制装置根据投影图像中每个像素的色域范围，控制及调整每个微镜单元位于所述开状态及所述关状态时间占比。
  7. 如权利要求5所述的投影系统，其特征在于，每个微镜单元还能位于第一偏转状态及第二偏转状态，其中，每个微镜单元在所述第一偏转状态的偏转角大于0并小于等于所述开状态的偏转角，每个微镜单元在所述第二偏转状态的偏转角小于0并大于等于所述停状态的偏转角；
    在亮灰阶时段的每个灰阶时段中，所述控制装置根据图像数据中每个像素的色域范围，控制及调整对应微镜单元处于所述第一偏转状态及所述第二偏转状态的偏转角度。
  8. 如权利要求7所述的投影系统，其特征在于，
    每个微镜单元位于所述第一偏转状态时的偏转角越接近所述开状态的偏转角，则所述微镜单元对所述第一光的利用率越高；
    每个微镜单元位于所述第二偏转状态时的偏转角越接近所述关状态的偏转角，则所述微镜单元对所述第二光的利用率越高。
  9. 如权利要求5-8任意一项所述的投影系统，其特征在于，每个亮灰阶时段的每个灰阶时段中，所述控制装置还控制所述第一光与所述第二光的功率，从而调整所述微镜单元反射至所述镜头中的第一光与第二光的比例。
  10. 如权利要求1-8任意一项所述的投影系统，其特征在于，
    当所述控制装置控制所述微镜单元反射所述第一光入射至所述镜头时，同时控制所述第一光源发出所述第一光，以及所述第二光源不发光；
    当所述控制装置控制所述微镜单元反射所述第二光入射至所述镜头时，同时控制所述第一光源不发光，以及所述第二光源发出所述第二光；
    当所述控制装置控制全部微镜单元均位于所述停状态时，同时控制所述第一光源及所述第二光源均不发光。
  11. 如权利要求1-8任意一项所述的投影系统，其特征在于，所述第一光源发出的第一光，与所述第二光源发出的第二光的光轴正交。
  12. 如权利要求1-8任意一项所述的投影系统，其特征在于，所述TIR棱镜包括4个相互拼接的不规则形状棱镜体，所述棱镜体之间设置有间隙。
  13. 如权利要求1-8任意一项所述的投影系统，其特征在于，所述第一光与所述第二光分别从所述数字微镜器件表面相邻的两侧边入射，并且所述第一光与所述第二光在所述表面形成的光斑重合。
  14. 如权利要求1-8任意一项所述的投影系统，其特征在于，所述第一光和所述第二光均包括激光或荧光。
PCT/CN2018/118815 2018-04-11 2018-12-03 投影系统 WO2019196428A1 (zh)

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