WO2018121063A1

WO2018121063A1 - Projection system

Info

Publication number: WO2018121063A1
Application number: PCT/CN2017/109335
Authority: WO
Inventors: 杨佳翼; 吴丹阳; 陈红运; 李屹
Original assignee: 深圳市光峰光电技术有限公司
Priority date: 2016-12-28
Filing date: 2017-11-03
Publication date: 2018-07-05
Also published as: CN108255001A; CN108255001B

Abstract

The present invention discloses a projection system (100). The projection system (100) comprises a light source (120), a color wheel (140) and a spatial light modulator (160). The light source (120) is used to emit light of the source light. The color wheel (140) is located on a light path of light of the source light. The color wheel (140) comprises at least two segmented areas (141) for receiving light of the source light respectively and correspondingly emitting at least two colors of light. The period in which a light spot (121) formed by the light of the source light irradiating on the color wheel (140) goes from beginning to cross the two segmented areas (141) to ending crossing the two segmented areas (141) is one spoke period (T2). The area irradiated by the light spot (121) during one spoke period (T2) constitutes one spoke area (142). The area other than the spoke area (142) included in one segmented area (141) constitutes one non-spoke area (141a), and the period in which the light spot (121) irradiates on the non-spoke area (141a) is a non-spoke period (T1). The spatial light modulator (160) is used to modulate at least two colors of light according to image data in order to produce projection light required for projecting an image, and the spatial light modulator (160) is turned off in the spoke period (T2) corresponding to the spoke area (142).

Description

Projection system

[0001] The present invention relates to the field of display technologies, and in particular, to a projection system.

[0002]

Background technique

[0003] Existing projection systems generally include 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, and the color wheel receives the light of the light source and sequentially emits as The red, green and blue tri-color sequence light, the spatial light modulator image-modulates the sequence light emitted by the color wheel according to the image data, and the projection lens projects the image light output by the spatial light modulator to The projected image is displayed.

technical problem

[0004] However, in the existing projection system, the color wheel emits a sequence of light, and the color wheel has two colors of light in an adjacent area between the segmented regions, which hinders the improvement of the image display quality, To solve this problem, in the prior art, the light source is generally turned off in the spoke area, so that the spoke area does not emit light, but the period of the light source off is very short, which requires a very high light source, which is theoretically feasible, but the actual operation will be When the light source does not respond quickly, the spoke effect also occurs, affecting the quality of the projected image of the projection system.

[0005]

Problem solution

Technical solution

In order to solve the technical problem that the spoke effect of the prior art affects the quality of the projected image, the present invention provides a projection system that 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 configured to emit light of the light source; the color wheel is located on an optical path where the light source emitted by the light source is located, the color wheel includes at least two segmented regions, and the at least two segmented regions respectively receive the light The light source light correspondingly emits at least two colors of light, and the light spot formed by the light source on the color wheel starts to span from two segmented regions to the end span The period in which the two segmented regions are experienced is a spoke period, and the region illuminated by the spot during one spoke period constitutes a spoke region; one spoke is divided into two segments respectively located in adjacent two segment regions An area other than the spoke area included in a segmented area constitutes a non-spoke area, and the period of the spot illumination on a non-spoke area is a non-rotation period; the spatial light modulator is used to modulate according to image data The at least two color lights are used to generate projection light required to project an image, the spatial light modulator being turned off during the spoke period.

In one embodiment, the light source is turned off during the spoke period.

In one embodiment, the light source enters the shutdown process section during the spoke period and enters the startup process section before the next non-rotation period begins.

[0010] In an embodiment, the light source sequentially enters a closing process section, a complete closing section, and a starting process section during the spoke period, and the light source enters a complete state during the non-rotation period. Time section.

[0011] In one embodiment, the light source enters the shutdown process section during the non-rotation period before the start of the spoke period, and enters the startup process section during the next non-rotation period.

[0012] In an embodiment, the light source sequentially enters the 吋 start process section, the complete 幵 start section, and the closing process section during the non-rotation period, and the light source enters the complete close during the spoke period. Time section.

[0013] In an embodiment, the light source is activated during the spoke period.

[0014] In an embodiment, the driving currents of the light sources in the two adjacent non-rotation periods are different, respectively being a first driving current and a second driving current, and the driving current of the light source is during the spoke period. The start is adjusted to transition from the first drive current to the second drive current.

[0015] In an 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. The segment regions are sequentially arranged in a circumferential direction, and the color wheel includes a first spoke region between the non-spoke region of the first segment region and the non-spoke region of the second segment region, located in the second segment a second spoke region between the non-spoke region of the region and the non-spoke region of the third segment region, and a non-spoke region between the third segment region and the non-spoke region of the first segment region In the three-spoke region, the driving current of the light source is different in the non-spinning period corresponding to the non-spoke region of the three segment regions, respectively, the first driving current, the second driving current, and The third driving current, the driving current of the light source is adjusted during the spoke period, and the driving current of the light source is in the spoke period corresponding to the first spoke region by the first driving a moving current becomes the second driving current, and a driving current of the light source is changed from the second driving current to the third driving current in a corresponding spoke period of the second spoke region, and a driving current of the light source The third drive current is changed to the first drive current during a spoke period corresponding to the third spoke region.

[0016] In an 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 second The non-spoke region of the segmented region receives the light source and emits red light, the third segment region carries a yellow wavelength converting material, and the non-spoke region of the third segment region receives the light source 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 smaller than the first driving current.

Advantageous effects of the invention

Beneficial effect

[0017] Compared with the prior art, in the projection system, the spatial light modulator is turned off during the spoke period to prevent the light generated by the image during the spoke period from being modulated by the spatial light modulator into modulated light. The image quality is affected so that the projected image quality of the projection system can be improved. Further, in one embodiment, only the spatial light modulator is turned off during the spoke period, so that the quality of the image display is changed in the simplest manner.

Brief description of the drawing

DRAWINGS

1 is a schematic structural view of a projection system according to a first embodiment of the present invention.

2 is a schematic structural view of the color wheel shown in FIG. 1.

3 to FIG. 5 are schematic diagrams showing the structure of the color wheel changing embodiment of FIG. 1.

6 is a schematic diagram showing the driving sequence of a light source and a spatial light modulator of the projection system shown in FIG. 1.

7 is a schematic diagram showing the driving sequence of a light source and a spatial light modulator of a projection system according to a second embodiment of the present invention.

8 is a schematic diagram showing the driving sequence of a light source and a spatial light modulator of a projection system according to a third embodiment of the present invention.

9 is a schematic diagram showing the driving sequence of a light source and a spatial light modulator of a projection system according to a fourth embodiment of the present invention. 10 is a schematic view showing the structure of a color wheel of a projection system according to a fourth embodiment of the present invention.

[0026]

[0027] Main component symbol description

[0028] Projection System 100

[0029] Light source controller 110

[0030] Light source 120

[0031] Spot 121

[0032] Color wheel drive device 130

[0033] color wheel 140, 440

[0034] Controller 150

[0035] Spatial Light Modulator 160

[0036] Projection lens 170

[0037] Image Data DATA

[0038] Segmented area 141, B, R, G, Y, Bl, Β2, Rl, R2, Gl, G2

[0039] Partial spoke area 141b

[0040] Spoke zones 142, 442a 442b

[0041] non-spoke zones 141a, 441a

[0042] The process phase tl

[0043] Closing process period t2

[0044] Fully open section t3

[0045] Completely close the section t4

[0046] Color wheel cycle T

[0047] Non-rotation period T1

[0048] Spoke period T2, Τ2', Τ2"

Drive current II, 12, 13

[0050] The present invention will be further described in conjunction with the above drawings in the following detailed description.

Embodiments of the invention First embodiment

Referring to FIG. 1, FIG. 1 is a schematic structural view of a projection system 100 according to a first embodiment of the present invention. The projection system 100 includes a light source controller 110, a light source 120, a color wheel drive 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, and the color wheel 140 is configured to receive the light emitted by the light source 120 and emit at least Two color lights, the spatial light modulator 160 is configured to image modulate the at least two color lights according to image data DATA to generate image light, and the projection lens 170 is configured to display according to the image light to display Project an image. The controller 150 is configured to control the light source controller 110 to turn on and off the light source 120, the driving speed of the color wheel driving device 130, and the modulation sequence of the spatial light modulator 160. Make the three fit.

[0053] Specifically, the light source controller 110 is configured to control the turning on and off of the light source 120, and the light source 120 is configured to receive a driving signal from the light source controller 110 and emit light of the light source, such as blue. The color source light, the light source 120 may be a blue light source. In a modified embodiment, the light source 120 may also be a light source of other colors, and is not limited to the blue light source. For example, the light source 120 may be an ultraviolet light source to emit ultraviolet light source light. Further, the light source 120 may be a semiconductor diode laser source for providing high-intensity source light.

Please refer to FIG. 2. FIG. 2 is a schematic structural view of the color wheel 140 shown in FIG. The color wheel 140 is located on an optical path where the light source emitted by the light source 120 is located, the color wheel 140 includes at least two segmented regions 141, and at least one of the at least two segmented regions 141 Carrying a wavelength conversion material thereon, the at least two segment regions 141 receiving the light source light and correspondingly emitting at least two color lights, and at least one of the at least two color lights is the wavelength conversion material Each of the segmented regions 141 emits one of the at least two color lights by the converted light generated by the excitation of the light source. The color wheel driving device 130 is configured to drive the color wheel 140 to move, so that the at least two segment regions 141 are periodically located on the optical path where the light source light is located and correspondingly periodically emit the at least two Kind of color light.

[0055] It can be understood that, in a modified embodiment, the light source 120 may also be a white light source, and at least two segmented regions 141 of the color wheel 140 may be filter regions carrying a filter material for Light of a certain color in the white light is filtered such that the at least two segmented regions 141 receive the light source light and correspondingly emit at least two color lights. [0056] In the embodiment, the at least two segmented regions 141 are disposed 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 such that the at least two The segmented region 14 1 is periodically located on the optical path where the source light is located, such that the at least two segmented regions 141 periodically emit the at least two colors of light. It can be understood that the size of the at least two segment regions 141 can be set to be the same or different according to actual needs.

[0057] Further, the period in which the light source light emitted by the light source 120 illuminates the spot formed on the color wheel 140 from the beginning to the crossing of the two adjacent segment regions 141 to the end of the two segment regions 141 is In a spoke period, the area illuminated by the spot during one spoke period constitutes a spoke area 142; the spoke area 142 is divided into two spoke areas 141b which are respectively located in adjacent two segment areas 141, one point The region other than the spoke region 141b included in the segment region 141 constitutes a non-spoke region 141a, and the period during which the spot is irradiated on one non-spoke region 141a is a non-rotation period. That is, each of the segmented regions 141 includes a non-spoke region 141a and a portion of the spoke region 141b, and two partial spoke regions 141b between the non-spoke regions 141a of the adjacent two segment regions 141 constitute the spoke region 142.

[0058] As shown in FIG. 2, in the embodiment, the color wheel 140 includes three segment regions 141 sequentially disposed in the circumferential direction, which are a first segment region B, a second segment region R, and The third segment area is 0. The first segment area B is used to emit a first color light, such as blue light. When the light source 120 is a blue light source, the first segment region R may be provided with a scattering material, and the light source 120 The emitted light may be scattered through the first segment region B and then emitted; when the light source 120 is an ultraviolet light source, the first segment region B may be provided with a first wavelength conversion material, and the light source 120 is emitted. The light can excite the first wavelength converting material to produce the first color light. The second segment region R is used to emit second color light, such as red light, and the second segment region R may be disposed with a second wavelength conversion material, such as a red phosphor, and the light emitted by the light source 120. The second wavelength converting material may be excited to generate the second color light, that is, red light; the third segment region G is used to emit a third color light, such as green light, and the third segment region G A third wavelength converting material, such as a green phosphor, may be disposed thereon, and the light emitted by the light source 120 may excite the third wavelength converting material to generate the third color light, that is, green light.

[0059] Further, in the embodiment shown in FIG. 2, the first segment area B, the second segment area R, and the third segment area G each include a non-spoke area 141a and adjacent another Part of the spoke area 141b of the segmented area. Wherein the two between the first segment region B and the non-spoke region 141a of the second segment region R The partial spoke region 141b may be defined as a first spoke region; the two partial spoke regions 141b between the second segment region R and the non-spoke region 141a of the third segment region G may be defined as a second spoke region The two partial spoke regions 141b between the third segment region G and the non-spoke region 141a of the first segment region B may be defined as a third spoke region. It can be understood that the terms "first", "second", and "third" before the segmentation area are used for description purposes only, and do not specifically define a certain area.

[0060] Further, as shown in FIG. 3, in the first modified embodiment, the color wheel 140 may include two segment regions 141 sequentially disposed in the circumferential direction, which are respectively the first segment region B and Second segment area ¥. The first segment area B is used to emit a first color light, such as blue light. When the light source 120 is a blue light source, the first segment area B may be provided with a scattering material, and the light source 120 The emitted light may be scattered through the first segment region B and then emitted; when the light source 120 is an ultraviolet light source, the first segment region B may be provided with a first wavelength conversion material, and the light source 120 is emitted. The light can excite the first wavelength converting material to produce the first color light. The second segment region Y is used to emit a fourth color light, such as yellow light, and the second segment region Y may be provided with a fourth wavelength conversion material, such as a yellow phosphor, and the light emitted by the light source 120. The fourth wavelength converting material can be excited to produce the fourth color light, ie, yellow light.

[0061] Further, in the embodiment shown in FIG. 3, the first segment area B and the second segment area Y each include a non-spoke area 141a and a partial spoke area 141b adjacent to the other segment area 141. . The two partial spoke regions 141b between the first segment region B and the non-spoke region 141a of the second segment region Y may be defined as a first spoke region; the second segment region Y and The other two partial spoke regions 141b between the non-spoke regions 141a of the first segment region B may be defined as second spoke regions.

[0062] Further, as shown in FIG. 4, in the second modified embodiment, the color wheel 140 may include four segment regions B, R, G, and Y which are sequentially disposed in the circumferential direction, respectively. A segment area Β, a second segment area R, a third segment area G, and a fourth segment area ¥. The first segment area B is used to emit a first color light, such as blue light. When the light source 120 is a blue light source, the first segment area B may be provided with a scattering material, and the light source 120 The emitted light may be scattered through the first segment region B and then emitted; when the light source 120 is an ultraviolet light source, the first segment region B may be provided with a first wavelength conversion material, and the light source 120 is emitted. The light can excite the first wavelength converting material to produce the first color light. The second segment area R is for emitting a second color light, such as red light, the second segment A second wavelength converting material, such as a red phosphor, may be disposed on the region R, and the light emitted by the light source 120 may excite the second wavelength converting material to generate the second color light, that is, red light; The segmentation area G is used to emit a third color light, such as green light, and the third segmentation area G may be provided with a third wavelength conversion material, such as a green phosphor, and the light emitted by the light source 120 may excite the light. The third wavelength converting material produces the third color light, ie, green light. The fourth segment area Y is used to emit a fourth color light, such as yellow light, and the fourth segment area Y may be provided with a fourth wavelength conversion material, such as a yellow phosphor, and the light emitted by the light source 120. The fourth wavelength converting material can be excited to produce the fourth color light, ie, yellow light.

[0063] Further, in the embodiment shown in FIG. 4, the first segment area B, the second segment area R, the third segment area G, and the fourth segment area Y are both A non-spoke zone 141a and a partial spoke zone 141b adjacent to another segment area are included. The two spoke regions 142b of the adjacent two segmented regions define the spoke regions 142.

[0064] Further, as shown in FIG. 5, in the third modified embodiment, the color wheel 140 may include six segment regions sequentially disposed in the circumferential direction, respectively being the first segment region B1, The second segment area B2, the third segment area R1, the fourth segment area R2, the fifth segment area G1, and the sixth segment area G2. The first segment area B1 and the second segment area B2 are used to emit first color light, such as blue light. When the light source 120 is a blue light source, the first segment area B1 and the second point. A scattering material may be disposed on the segment region B2, and the light emitted by the light source 120 may be scattered 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 converting material 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 excite the first wavelength converting material to generate the first color light. The third segment region R1 and the fourth segment region R 2 are used to emit second color light, such as red light, and the third segment region R1 and the fourth segment region R2 may be disposed with a second wavelength. Converting a material, such as a red phosphor, the light emitted by the light source 120 can excite the second wavelength converting material to generate the second color light, that is, red light; the fifth segment region G1 and the sixth segment The region G2 is used to emit a third color light, such as green light, and the fifth segment region G1 and the sixth segment region G2 may be disposed with a third wavelength converting material, such as a green phosphor, and the light source 120 emits Light can excite the third wavelength converting material to produce the third color light, ie, green light.

[0065] Further, in the embodiment shown in FIG. 5, the first segment area B1 and the second segment area B2 The third segment region R1, the fourth segment region R2, the fifth segment region G1, and the sixth segment region G2 each include a non-spoke region and a portion adjacent to another segment region. Spoke area. The two spoke regions 142b of the adjacent two segmented regions define the spoke regions 142.

In the embodiment, the color wheel 140 is a transmissive color wheel, that is, the light of the light source 120 is incident from one side of the color wheel 140, and the other side of the color wheel 140 is emitted. Said at least two colors of light. However, it can be understood that, in a modified embodiment, the color wheel 140 may also be a reflective color wheel, that is, the light of the light source 120 is incident from one side of the color wheel, and the color wheel 140 The at least two colors of light are emitted from the side. The spatial light modulator 160 can be a DMD modulator, but is not limited to a DMD adjuster.

Please refer to FIG. 6. FIG. 6 is a schematic diagram showing the driving sequence of the light source 120 and the spatial light modulator 160 of the projection system 100 of FIG. First, each driving segment of the light source 120 is defined. The driving segment of the light source 120 includes a starting process segment t1, a closing process segment t2, a full opening segment t3, and a fully closed segment t4. The 吋吋 tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl tl The light source 120 applies a driving signal to the inter-turn period in which the driving current of the light source 120 is reduced to zero and is completely closed. The full-turning section t3 is a daytime operation in which the light source 120 reaches a normal operating current. In the segment, the fully closed segment t4 is an inter-turn segment in which the driving current of the light source 120 is zero. It can be understood that, in the starting process segment t1 and the closing process segment t2, the light source 120 can also emit light with a light intensity lower than the full start-up period t3 (ie, normal working time). Strong.

[0068] Second, define the non-rotation period T1 and the spoke period T2. In each color wheel cycle (i.e., the daytime during which the color wheel rotates one revolution), the non-spoke zone 141a of each segmented region 141 corresponds to the non-spinning period T1 of the inter-turn segment, wherein the non-spoke of each segmented region 141 The non-rotational region 141a of the segmented region 141 of the color wheel 140 receives the light source light and emits a color light when the non-spinning period T1 is located on the optical path where the light emitted by the light source 120 is located. The inter-turn period between two adjacent non-spinning periods T1 is the spoke period T2 corresponding to the spoke area 142. It can be understood that, in the spoke period T2, the spoke area 142 is located in the light of the light emitted by the light source 120. On the way, the light source 120 may not emit light during the spoke period.

[0069] Each color wheel cycle includes alternately disposed non-spin period T1 and spoke period ,2, wherein the number of non-spin periods T1 and spoke period T2 and the non-spoke area 141a of the segmented area 141 and the spokes The number of zones 142 is the same. When the number of non-rotation periods T1 is two or more, the two or more non-rotation periods T1 The length can be different.

[0070] In the embodiment shown in FIG. 6, the light source 120 and the spatial light modulator 160 are both turned off during the spoke period under the control of the light source controller 110 and the controller 150. . In detail, in this embodiment, the light source 120 enters the closing process section t2 during the spoke period T2, and enters the initiating process section tl before the next non-rotation period T1 begins. Specifically, the light source 120 sequentially enters the closing process section t2, the completely closing section t4, and the opening process section t1 during the spoke period T2, and the light source 120 enters the complete rotation period T1 during the non-rotation period T1. Section t3.

[0071] Compared with the prior art, in the projection system 100, the spatial light modulator 160 is turned off during the spoke period T2 to prevent light generated by the image during the spoke period T2 from being used by the spatial light modulator. The 160 modulation becomes modulated light to affect the image quality, so that the projected image quality of the projection system 100 can be improved.

Further, in an embodiment, both the light source 120 and the spatial light modulator 160 are turned off during the spoke period T2, which on the one hand ensures the quality of the image display and on the other hand saves energy. Since the total length of the spoke period T2 accounts for at least 1/20 of the length of one color wheel period, the energy saving effect of the projection system 100 reaches more than 5%.

Second Embodiment

Please refer to FIG. 7, FIG. 7 is a schematic diagram showing the driving sequence of the light source and the spatial light modulator of the projection system according to the second embodiment of the present invention. The projection system of the second embodiment is substantially identical to the projection system of the first embodiment, that is, the description of the projection system of the first embodiment can also be basically applied to the projection of the second embodiment. The main difference between the two systems is: The driving order of the light source is 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.

[0075] In the second embodiment, only the spatial light modulator is turned off during the spoke period T2, so that the quality of the image display is changed in the simplest manner.

Third Embodiment

Please refer to FIG. 8. FIG. 8 is a schematic diagram showing the driving sequence of the light source and the spatial light modulator of the projection system according to the third embodiment of the present 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 basically applied to the projection of the third embodiment. The main difference between the two systems is: The driving order of the light source is different. With In the third embodiment, the non-rotation period T1 of the light source before the start of the spoke period T2 enters the closing process section t2, and enters the initiating process section t1 at the next non-rotation period T1. Specifically, as shown in FIG. 7 , the light source sequentially enters the 吋 start process segment t1, the complete 幵 start segment t3, and the shutdown process segment t2 during the non-rotation period T1, and the light source enters the complete shutdown during the spoke period T2. Section t4.

[0078] In the third embodiment, the light source is turned off immediately before the start of the spoke period T2 and is turned on in the next non-spin period T1, so that the light source is completely turned off during the spoke period T2, thereby More energy efficient.

Fourth Embodiment

Referring to FIG. 9, FIG. 9 is a schematic diagram showing the driving sequence of the light source and the spatial light modulator of the projection system according to the fourth embodiment of the present 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 basically applied to the projection of the fourth embodiment. The main difference between the two systems is that the driving order of the light source is different from the structure of the color wheel.

Referring to FIG. 10, FIG. 10 is a schematic structural view of a color wheel 440 according to the embodiment. The color wheel 440 includes a first segment area 8, a second segment area R, and a third segment area Y, and the first segment area Β, the second segment area R, and the third segment area Υ Arranged in a circumferential direction, the color wheel 440 includes a first spoke region 442a between the non-spoke region 441a of the first segment region 非 and the non-spoke region 441a of the second segment region R, located at the a second spoke region 442b between the non-spoke region 441a of the second segment region R and the non-spoke region 441a of the third segment region Y, and a non-spoke region 441a located in the third segment region Y and the A third spoke region 442c between the non-spoke regions 441a of the first segment region B.

Specifically, in the driving sequence of the light source of the projection system according to the fourth embodiment of the present invention, the driving current of the light source is different from the driving current of the non-spinning period T1 corresponding to the non-spoke region 441a of the three segment regions. Differentily, the first driving current II, the second driving current 12, and the third driving current 13 respectively, the driving current of the light source is adjusted at the beginning of the spoke period T2, and the driving current of the light source The spoke period T2 corresponding to the first spoke region 442a transitions from the first driving current II to the second driving current 12, and the driving current of the light source is in the spoke period T2' corresponding to the second spoke region 442b. The second driving current 12 transitions to the third driving current 13, and the driving current of the light source changes to the spoke period T2" corresponding to the third spoke region 442c by the third driving current 13 A drive current II.

[0083] In this embodiment, the non-spoke region 441a of the first segment region B receives the light source and emits blue Color light, the second segment region R carries a red wavelength conversion material, and the non-spoke region 441a of the second segment region R receives the light source light and emits red light, and the third segment region Y carries a yellow wavelength converting material, and the non-spoke region 441a of the third segment region Y receives the light source and emits yellow light, the first driving current II is greater than the second driving current 12, the third The drive current 13 is greater than the second drive current 12 and less than the first drive current II.

[0084] In the fourth embodiment, the driving current of the light source needs to be modulated according to different non-rotation period T1, for example, a high driving current is used in the non-rotation period T1 of the blue light, and a non-rotation period in which the red light is emitted. The T1' segment uses a low drive current, and uses a higher drive current than the red light during the non-spoke period of the exiting yellow light.

. On the one hand, the adjustment of the drive current of the light source is completed during the spoke period T2, and since the spoke period T2 is relatively long, the response speed to the light source is required to be low. On the other hand, during the spoke period T2, the current modulation of the light source is completed during this period, and the spatial light modulator is in a closed state, and the light emitted by the light source is not a predetermined brightness, and no image is output during this period. Light, which makes the image display better.

[0085] It can be understood that in the modified embodiment of the fourth embodiment, the color wheel of the fourth embodiment may also adopt the color wheel of FIG. 3, FIG. 4 or FIG. 5 or other different segment structures, and the driving current of the light source is in the n The non-spinning period 441a of the segmented region has different driving currents in the non-spinning period T1, n represents the number of segmented regions, n is a natural number greater than or equal to 2, and the spoke period T2 corresponding to a certain spoke region 442b 'Transition from the second drive current of the last non-rotational period to the first drive current of the next episode. For example, in a modified embodiment, the color wheel adopts the color wheel 图 described in FIG. 3, and the driving current of the light source is the driving current of the non-spoke period T1 corresponding to the non-spoke area 441a of the two segmented regions. Differently, respectively, the first driving current II and the second driving current 12, the driving current of the light source is adjusted at the beginning of the spoke period T2, and the driving current of the light source is in the first spoke area The spoke period T2 corresponding to 442a is transitioned from the first driving current II to the second driving current 12, and the driving current of the light source is in the spoke period T2' corresponding to the second spoke region 442b by the second driving current 12 Transitioning to the first drive current II. Further, in light of the above, it is believed that those skilled in the art can understand the driving current variation manner of the embodiment in which n is equal to 4 or 6 or the like, and the embodiment in which n is equal to 4 or 6 and other numerical values will not be described herein. .

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformation using the specification and the drawings of the present invention may be directly or indirectly utilized. Other related technical fields are equally included in the scope of patent protection of the present invention.

Claims

Claim

[Claim 1] A projection system comprising a light source, a color wheel and a spatial light modulator, wherein: the light source is used to emit light from a source;

The color wheel is located on an optical path where the light source emitted by the light source is located, the color wheel includes at least two segmented regions, and the at least two segmented regions respectively receive the light source light and correspondingly emit at least two colors Light, the period in which the light source light illuminates the spot formed on the color wheel from the beginning to the two segmented regions to the end of the two segmented regions is a spoke period, and the spot is in a spoke period The irradiated area constitutes a spoke area; one spoke is divided into two sections respectively located in two adjacent segmented regions, and a region outside the spoke region included in one segmented region constitutes a non-spoke region, and the spot is illuminated in one The period experienced on the non-spoke zone is a non-rotation period;

The spatial light modulator is operative to modulate the at least two color lights in accordance with image data to produce projection light required to project a image, the spatial light modulator being turned off during the spoke period.

[Claim 2] 2. The projection system of claim 1, wherein: the light source is turned off during the spoke period.

[Claim 3] The projection system according to claim 2, wherein: the light source enters the closing process section during the spoke period, and enters the opening period before the next non-rotation period begins. Process segment.

[Claim 4] The projection system according to claim 3, wherein: the light source sequentially enters a closing process section, a complete closing section, and a starting process section during the spoke period, The light source enters the full opening period during the non-rotational period.

[Claim 5] The projection system according to claim 2, wherein: the light source enters a closing period of the non-rotation period before the start of the spoke period, and starts at the next non-rotation period吋 Enter the stage of the process.

[Claim 6] The projection system according to claim 5, wherein: the light source sequentially enters the 吋 start process section, the complete 幵 start section, and the closing process section during the non-rotation period, The light source enters a fully closed section during the spoke period.

[Claim 7] The projection system of claim 1 wherein: said light source is at said spoke Period Qi Kai.

[Claim 8] The projection system according to claim 7, wherein: the driving current of the light source in two adjacent non-rotation periods is different, respectively, a first driving current and a second driving current, respectively The drive current of the light source is adjusted during the spoke period, transitioning from the first drive current to the second drive current.

[Claim 9] The projection system according to claim 8, wherein: the color wheel comprises a first segment area, a second segment area, and a third segment area, the first segment The region, the second segment region, and the third segment region are sequentially arranged in a circumferential direction, and the color wheel includes a second portion between the non-spoke region of the first segment region and the non-spoke region of the second segment region a spoke region, a second spoke region between the non-spoke region of the second segment region and a non-spoke region of the third segment region, and a non-spoke region located in the third segment region and the first a third spoke region between the non-spoke regions of the segmented region, wherein a driving current of the light source is different in a non-spinning period corresponding to a non-spoke region of the three segment regions, respectively a driving current, the second driving current, and the third driving current, a driving current of the light source is adjusted during the spoke period, and a driving current of the light source corresponds to the first spoke area The first driving power Changing to the second driving current, the driving current of the light source is changed from the second driving current to the third driving current in a corresponding spoke period of the second spoke region, and the driving current of the light source is at The spoke period corresponding to the third spoke region is changed from the third driving current to the first driving current.

[Claim 10] 10. The projection system according to claim 9, wherein: the non-spoke region of the first segment region receives the light source light and emits blue light, and the second segment region carries a red wavelength converting material, wherein the non-spiwing region of the second segment region receives the light source and emits red light, the third segment region carries a yellow wavelength converting material, and the third segment region The non-spoke region receives the light source 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 smaller than the first driving current.