Display device, control method and light source

Abstract

The present invention provides a display device, a control method and a light source. The light source system is used to continuously output a first light and time-sharingly output a second light. The color wheel device includes sections that transmit red light, green light and red light, blue light respectively, and generates a synchronization signal for the control system to control the operation of the light source system and a spatial light modulator. Two spatial light modulators are used to modulate red light and green light and blue light respectively. According to the synchronization signal, the control system controls the time-sharing modulation of green and blue light within a cycle, controls the continuous modulation of red light within a cycle, and controls the time-sharing output of the second light. The advantage is that by continuously outputting red light and time-sharingly outputting the other two primary color lights, and making the spatial light modulator, the color wheel device and the light source work synchronously, the utilization rate of the less primary color lights in the spectrum is improved. Compared with the prior art, it can greatly improve the brightness after color correction and avoid the problems caused by the excess of primary color lights.

Description

Technical Field

[0001] The present invention relates to the field of lighting and display technology, and in particular to a display device, a control method and a light source. Background Art

[0002] With the maturity of fluorescent material technology and the rapid development of semiconductor laser technology, laser fluorescent material light sources have been increasingly used in the projector field. Compared with traditional light sources, they have the advantages of long life and high brightness. Compared with pure laser light sources, they have the advantages of high cost performance and fewer speckle problems.

[0003] However, the laser fluorescent material light source has the following problems: the green band is too much and the red band is too little in the spectrum, such as Figure 1 The figure shows the spectrum of a laser fluorescent material light source used in a three-chip spatial light modulator projection system (the horizontal axis is wavelength and the vertical axis is relative intensity). The energy in the red band above 600nm is obviously too low. If this light source is used in a three-chip spatial light modulator projection system, without white light color correction, the white light will be seriously blue due to the large amount of green light. In order to calibrate to the color required by standards such as REC.709 or DCI, according to the differences in different optical systems, the brightness after correction is only about 60% of that before correction, and about 30% of the green light is excessive. If this excess light is directed to the spatial light modulator, it will not only increase the thermal load of the spatial light modulator, but also occupy the modulation time of the spatial light modulator and affect the modulatable color bit depth, and seriously affect the contrast of the projector.

[0004] Among the various components that make up the projector, the spatial light modulator accounts for a high proportion of the cost. In order to reduce costs, a two-chip spatial light modulator projection system came into being. It can allocate a separate spatial light modulator to the red primary light with insufficient energy in the light source spectrum, while the other two primary lights share another spatial light modulator, which are output in different time periods, and use a relatively short time to display the light with excess brightness. While maintaining the brightness after color correction and the overall change of the three-chip spatial light modulator projection system, it not only avoids the problems caused by the excess blue-green light mentioned above, but also saves a spatial light modulator, and the overall cost will still be reduced a lot.

[0005] Although the above idea is good, in the existing two-chip spatial light modulator projection system using laser fluorescent material light source, the excitation light generating device for exciting the fluorescent material and the light generating device for providing the blue primary light are the same device, which must be used to excite the fluorescent material (yellow light) in part of the time period and output the blue primary light in part of the time period. It is not possible to excite the fluorescent material to produce the stimulated light containing the red primary light while providing the blue primary light. Therefore, there is no red primary light output in the blue primary light time period, so that the spatial light modulator dedicated to modulating the red primary light has no red primary light to modulate in this part of the time period. The output of the red primary light and the output of the green primary light are not relatively increased compared with the three-chip spatial light modulator projection system analyzed above, which means: compared with the three-chip spatial light modulator projection system, due to the lack of red primary light, the brightness of the existing two-chip system is greatly reduced; in practical applications, the problem of excess green primary light still exists.

[0006] Therefore, how to provide a solution that can ensure brightness and solve the problem of excess green laser has become an urgent problem to be solved. Summary of the invention

[0007] The present invention provides a display device, a control method and a light source, which are used to solve the problems of low brightness after color temperature correction and excess green primary color light in a three-chip spatial light modulator projection system in the prior art when a laser fluorescent material light source is used. While solving the problems of the prior art, the cost is reduced and each primary color light can be flexibly modulated.

[0008] In order to achieve the above-mentioned purpose, the technical solution of the present invention provides a display device, including: a light source system, including a first light source capable of continuously outputting a first light, and a second light source capable of non-continuously outputting a second light, the first light at least includes red light, the second light at least includes blue light, and green light can be included in the first light, can also be included in the second light, or exists in both the first light and the second light; a color wheel device, used to transmit different primary color lights; the color wheel device includes at least two types of segments, each type of segment has one or more, after the color wheel device is placed in the light path, the various segments are rotated to be in the light path in rotation and a synchronization signal is sent to a control system according to the status of different segments in the light path; specifically, when the first type of segment is in the light path, the color wheel device transmits red light and green light and sends a signal to the light source system to output the first light source and attenuate or turn off the second light source, and when the second type of segment is in the light path, the red light and the blue light are transmitted and a signal to the light source system to output the second light. Two spatial light modulators, including a first spatial light modulator and a second spatial light modulator for modulating different primary color lights, the second spatial light modulator modulates green light or blue light in time periods according to the synchronization signal. A light splitting and light combining device is placed after the color wheel device, and is used to guide the red light filtered by the color wheel device to the first spatial light modulator, and partially guide the green light or blue light to the second spatial light modulator, and output the combined light of each primary color light modulated by the first spatial light modulator and the second spatial light modulator. A control system is used to control the second light source to preferably stop or weaken the output of blue light and control the second spatial light modulator to modulate green light in this time period according to the synchronization signal generated by the color wheel device when the first section of the color wheel device is in the light path; when the second section of the color wheel device is in the light path, control the second light source to output blue light and control the second spatial light modulator to modulate blue light in this time period; when the color wheel device is operating, the control system controls the first spatial light modulator to continuously modulate red light.

[0009] As a preferred embodiment of the above technical solution, preferably, when the color wheel device has a third segment and it is in the light path, the segment can transmit part of the red light, part of the green light and part of the blue light. Moreover, the segment can adjust the transmission ratio of each primary color light through coating according to the ratio of primary color light in the light source to output white light that meets the color temperature requirements.

[0010] As a preferred embodiment of the above technical solution, preferably, the light output by the second light source has a wavelength of 440nm to 460nm, and the second section of the color wheel device can transmit part of the green light in the light emitted by the first light source according to the color coordinate requirements of the blue light.

[0011] To achieve the above-mentioned purpose, the present invention also provides a control method for realizing the control of the above-mentioned device, including: in a cycle, the first light is continuously output, and the working state of the second light changes with the change of the state of the color wheel device. The working states of the first light and the second light are adjusted according to the position and time of each filter section in the color wheel device. When the first section enters the optical path, this is a first period, the control system controls the first light to be output, and controls the second light to preferably stop or weaken the output. At the same time, the control system controls the first spatial light modulator to modulate the red light in the first light, and controls the second spatial light modulator to modulate the green light in the first light. When the first section leaves the optical path and the second section enters the optical path, this is a second period, the control system controls the first light to keep outputting and controls the outputting of the second light, the control system controls the second spatial light modulator to modulate the blue light in the second light, and the first spatial light modulator to modulate the red light in the first light; wherein the color wheel device includes at least two filter sections: a first filter section that transmits the first primary color and the second primary color, and a second filter section that transmits the first primary color and the third primary color.

[0012] As a preferred embodiment of the above technical solution, preferably, the second light may include only blue light, or may include, in addition to the blue light, at least a portion of green light outputted in a time-sharing manner with the blue light.

[0013] As a preferred embodiment of the above technical solution, preferably, when the second light includes the second primary color and blue light, the green light portion of the second light is output in the first time period, and is guided to the second spatial light modulator together with the green light of the first light and modulated, and in the second time period, the green light in the second light is not output or the output is weakened.

[0014] In order to implement the above method and device, the technical solution of the present invention further provides a light source, including: a first light source, used to emit a first light, the first light includes red light and green light, or only includes red light; a second light source, used to emit a second light, the second light includes only blue light, or includes blue light and green light output in time division.

[0015] As a preferred embodiment of the above technical solution, it is preferable to further include a supplementary light generating device for emitting red supplementary light.

[0016] As a preferred embodiment of the above technical solution, it is preferable to further include an auxiliary filtering device, which is placed after the wavelength conversion device in the optical path and is used for secondary filtering of the converted light.

[0017] As a preferred embodiment of the above technical solution, preferably, the second light source includes a blue photon light source and a green photon light source, and the blue photon light source and the green photon light source are used to output the second light including the blue light and the green light in a set time period according to the control of the control system.

[0018] The technical solution of the present invention provides a display device, a control method and a light source. The light source system is used to continuously output the first light and output the second light in time periods. The first light includes the first and second primary color lights, and the second light includes blue light. The color wheel device includes at least two filtering sections, which can generate synchronization signals for the control system to control the operation of the light source system and the spatial light modulator. One section transmits the first and second primary color lights, and the other section transmits the first and third primary color lights. Two spatial light modulators are used to modulate red light and modulate the second and third primary color lights, respectively. A light splitting and light combining device is used to guide the light output by the light source system to different spatial light modulators after being filtered by the color wheel device, and output the light combined with various primary colors modulated by the two spatial light modulators. The control system controls the time-sharing modulation of the second and third primary color lights within a cycle according to the synchronization signal, controls the continuous modulation of the red light within a cycle, and controls the time-sharing output of the second light.

[0019] The advantage of the present invention is that by continuously outputting one primary color light to a spatial light modulator and time-sharingly outputting the other two primary color lights to another spatial light modulator, the primary color lights with a relatively small proportion in the light source spectrum can be more fully utilized, so that the two-chip spatial light modulator projection system can achieve a color-corrected brightness close to that of the three-chip spatial light modulator projection system, thereby greatly improving the brightness and avoiding the related problems caused by the excess of a certain primary color light. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is the spectrum of the laser fluorescent material light source in the prior art.

[0022] Figure 2a A schematic diagram of the structure of the first embodiment of the display system provided by the technical solution of the present invention Figure 1 .

[0023] Figure 2b FIG2 is a second structural diagram of the first embodiment of the display system provided by the technical solution of the present invention.

[0024] Figure 2c FIG3 is a structural schematic diagram of the first embodiment of the display system provided by the technical solution of the present invention.

[0025] Figure 3a The structure of the color wheel device in the technical solution of the present invention is shown in FIG. Figure 1 .

[0026] Figure 3b This is a second structural schematic diagram of the color wheel device in the technical solution of the present invention.

[0027] Figure 3c This is the third structural schematic diagram of the color wheel device in the technical solution of the present invention.

[0028] Figure 3d This is structural schematic diagram 4 of the color wheel device in the technical solution of the present invention.

[0029] Figure 3e This is structural schematic diagram 5 of the color wheel device in the technical solution of the present invention.

[0030] Figure 4a The first light and the second light in the technical solution of the present invention are Figure 3a Schematic diagram of the working status of the color wheel in one rotation cycle.

[0031] Figure 4b The first light and the second light in the technical solution of the present invention are Figure 3b Schematic diagram of the working status of the color wheel in one rotation cycle.

[0032] Figure 4c The first light and the second light in the technical solution of the present invention are Figure 3c Schematic diagram of the working status of the color wheel in one rotation cycle.

[0033] Figure 5a For Figure 4a The corresponding timing diagram shows that the two spatial light modulators in the technical solution of the present invention are Figure 3a Schematic diagram of the working status of the color wheel in one rotation cycle.

[0034] Figure 5b For Figure 4b The corresponding timing diagram shows that the two spatial light modulators in the technical solution of the present invention are Figure 3b Schematic diagram of the working status of the color wheel in one rotation cycle.

[0035] Figure 5c For Figure 4c The corresponding timing diagram shows that the two spatial light modulators in the technical solution of the present invention are Figure 3c Schematic diagram of the working status of the color wheel in one rotation cycle.

[0036] Figure 6a A schematic diagram of the structure of the second embodiment of the display system provided by the technical solution of the present invention Figure 1 .

[0037] Figure 6b FIG2 is a second structural diagram of the second embodiment of the display system provided by the technical solution of the present invention.

[0038] Figure 6c A schematic diagram of the structure of the third embodiment of the display system provided by the technical solution of the present invention Figure 1 .

[0039] Figure 6d FIG2 is a second structural diagram of a third embodiment of a display system provided by the technical solution of the present invention.

[0040] Figure 7 A schematic structural diagram of a fourth embodiment of a display system provided by the technical solution of the present invention. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] The display system, control method and light source provided by the present invention are now described in combination with various specific embodiments:

[0043] First, it should be noted that the embodiments of the present invention are described by taking red light, green light and blue light as examples, and the colors corresponding to the three primary colors in the actual implementation process are not limited.

[0044] The light source provided by the present invention comprises:

[0045] The first light source for emitting the first light. Specifically, when the first light is realized by a combination of multiple devices, the first light source is the excitation light generating device 101 ; when the first light is directly generated by a single device, the first light source is the first light generating device 110 .

[0046] A second light source for emitting a second light. Specifically, when the second light includes only blue light, the second light source is a second light generating device 107 that can only emit blue light; when the second light includes blue light and green light output in time division, the second light source is composed of a blue light source 117 and a green light source 108, and the blue light source 117 and the green light source 108 are used to output the second light of blue light and green light respectively in a set time period according to the control of the control system 401. The current second light source may also include a supplementary light generating device 118 for emitting supplementary light of red light.

[0047] The wavelength conversion device 103 is used to convert the excitation light into a converted light having a wavelength different from that of the excitation light.

[0048] An optional auxiliary filter device 109 is also included, which is placed after the wavelength conversion device 103 in the optical path and is used for secondary filtering of the converted light.

[0049] The technical solution of the present invention is described in detail by combining the above light sources in different ways with color wheel devices in different forms as follows:

[0050] Figure 2a to Figure 2c A schematic diagram of the structure of a display device provided in the first embodiment of the present invention, as shown in FIG. Figure 2a to Figure 2c As shown, it includes: a light source system 100, a color wheel device 201, a light homogenizing device 202, a light splitting and combining device 203, a first spatial light modulator 2041 and a second spatial light modulator 2042 installed in the light splitting and combining device 203, a projection lens 301, and a control system 401. In the process of normal image display, the excitation light generating device 101 in the light source system 100 continuously generates excitation light to stimulate the wavelength conversion device 103 to continuously generate stimulated light and continuously output the first light to the color wheel device 201; the second light generating device 107 outputs the second light to the color wheel device 201 in time periods.

[0051] Among them, Figure 2a As shown, the light source system 100 comprises an excitation light generating device 101, a wavelength conversion device 103, a second light generating device 107, a filter device 102, and an optional auxiliary filter device 109. The wavelength conversion device 103 is provided with a wavelength conversion material.

[0052] The excitation light generating device 101 (first light source) continuously generates excitation light. After the excitation light is transmitted through the filter device 102, it goes along the optical path to the wavelength conversion device 103. The wavelength conversion material on the wavelength conversion device 103 is excited by the excitation light to generate the stimulated light. The stimulated light is emitted to the filter device 102 in the opposite direction of the excitation light optical path and is reflected by the filter device 102. The reflected part is the first light. The first light is guided to the color wheel device 201 along the optical path. Figure 3a After the first light is filtered by the first filter section 2011 in the color wheel device 201, the red light (hereinafter referred to as red light) and the green light (hereinafter referred to as green light) in the first light enter the light homogenizing device 202. When the first light enters the second filter section 2012 in the color wheel device 201, the red light is partially transmitted, while the green light is partially blocked.

[0053] Combination Figure 3a The second light source outputs the second light discontinuously as the color wheel device 201 rotates. Figure 2aThe second light source emits a second light including blue light (hereinafter referred to as blue light), and after being transmitted by the filter device 102, the second light is guided to the color wheel device 201 along the same optical path as the first light, and enters the light homogenizing device 202 after passing through the second filter section 2012 in the color wheel device 201. When the filter device 102 or the color wheel device 201 needs to have a stronger filtering function due to the difficulty of coating design, or the projection system has additional requirements for the color gamut, or other reasons, an auxiliary filter device 109 can be added between the two to achieve the target filtering requirements.

[0054] The light emitted by the light homogenizing device 202 is guided to the light splitting and combining device 203, and is first split by the light splitting and combining device 203. After splitting, the red light is guided to the first spatial light modulator 2041, and the green light or the blue light is guided to the second spatial light modulator 2042. The two parts of light are modulated by the two spatial light modulators respectively and then combined by the light splitting and combining device 203, and transmitted to the screen through the projection lens.

[0055] Specifically, the control system 401 controls the working states of the excitation light generating device 101 , the second light source, the first spatial light modulator 2041 and the second spatial light modulator 2042 in real time according to the rotation state of the color wheel device 201 .

[0056] In detail, the color wheel device 201 is a color wheel with two or more filter sections, which are rotated to allow different filter sections to be in the light path in turn, and each filter section has a different color filtering function, such as Figure 3a The color wheel structure shown in FIG. 1 includes two filter sections 2011 and 2012, each of which is coated with a different color filter film. The first filter section 2011 can pass green and red light, while filtering out blue light. The second filter section 2012 allows blue and red light to pass through, while filtering out green light.

[0057] In each cycle of the color wheel device 201 rotating in the clockwise direction, when the boundary line 2010b between the second filter section 2012 and the first filter section 2011 enters the light path, the excitation light generating device 101 works, and the output light of the second light source preferably stops or weakens. At this time, the first light enters the first filter section 2011, and the light with a longer wavelength than the blue light, including red light and green light, is allowed to pass through. At this time, if there is blue light, it should be filtered to the extent that it does not affect the target color gamut; when the color wheel continues to rotate clockwise to the first filter section 2 When the boundary line 2010a between the color wheel device 2011 and the second filter section 2012 enters the light path in a clockwise direction, the exciting light generating device 101 and the second light source are both working. At this time, the light incident on the color wheel device 201 contains three colors: blue, red, and green. Since the second filter section 2012 in the color wheel device enters the light path, the light with wavelengths in the blue and red wavelength ranges is allowed to pass through, and the green light should be filtered to a degree that does not affect the target color gamut. When the color wheel continues to rotate clockwise and the color wheel section boundary line 2010b enters the light path again, the color wheel completes a rotation cycle. In this way, in one rotation cycle of the color wheel device 201, red light is continuously output, while blue and green light are output in time division, corresponding to the following. Figure 3a In the color wheel shown, blue light is output to the subsequent light path only when the 2012 section of the color wheel device 201 is in the light path, and green light is output to the subsequent light path only when the 2011 section of the color wheel device 201 is in the light path. Figure 3a The color wheel shown has only one set of blue-red and green-red segments, but it can also have two sets of blue-red and green-red segments, or more sets.

[0058] Further, such as Figure 3b The color wheel structure shown in FIG. 1 is another color wheel structure, which has two groups of blue-red and green-red transparent segments, that is, four segments, namely, a first green-red transparent segment 2011a, a first blue-red transparent segment 2012a, a second green-red transparent segment 2011b, and a second blue-red transparent segment 2012b. The first green-red transparent segment 2011a and the second green-red transparent segment 2011b have and Figure 3a The first filter section 2011 in the color wheel device shown has the same color filtering function, and the first blue-red transparent section 2012a and the second blue-red transparent section 2012b have the same color filtering function. Figure 3a The second filter section 2012 in the color wheel device shown has the same color filtering function.

[0059] exist Figure 3b In each cycle of the color wheel device 201 shown in FIG. 2 rotating clockwise, when the boundary line 2010b between the first blue-red transparent segment 2012a and the first green-red transparent segment 2011a enters the light path, Figure 2aWhen the excitation light generating device 101 is working, the output light of the second light source is preferably stopped or weakened. At this time, the first light is injected into the first green-red segment 2011a, and light with a wavelength longer than that of blue light, including red light and green light, is allowed to be transmitted. At this time, if there is blue light, it should be filtered to the extent that it does not affect the target color gamut; when the color wheel continues to rotate clockwise to the intersection line 2010c between the first green-red segment 2011a and the second blue-red segment 2012b and enters the light path, the excitation light generating device 101 and the second light source are both working. At this time, the light injected into the color wheel device 201 includes blue, red and green. Since the second blue-red segment 2012b in the color wheel device enters the light path, light with wavelengths within the blue and red wavelength ranges is allowed to be transmitted, and the green light should be filtered to the extent that it does not affect the target color gamut; when the color wheel continues to rotate clockwise to the intersection line 2010d between the second blue-red segment 2012b and the second green-red segment 2011b When entering the optical path, the excitation light generating device 101 works, and the output light of the second light source preferably stops or weakens the output. At this time, the first light is emitted into the second green-red transparent segment 2011b, and light with a wavelength longer than that of blue light, including red light and green light, is allowed to be transmitted. At this time, if there is blue light, it should be filtered to the extent that it does not affect the target color gamut; when the color wheel continues to rotate clockwise to the intersection line 2010a between the second green-red transparent segment 2011b and the first blue-red transparent segment 2012a and enters the optical path, the excitation light generating device 101 and the second light source both work. At this time, the light emitted into the color wheel device 201 includes blue, red and green. Since the first blue-red transparent segment 2012a in the color wheel device enters the optical path, light with wavelengths within the blue and red wavelength ranges is allowed to be transmitted, and green light should be filtered to the extent that it does not affect the target color gamut; when the color wheel continues to rotate clockwise and the color wheel segment intersection line 2010b enters the optical path again, the color wheel completes a rotation cycle.

[0060] In this way, when the first green-red segment 2011a and the second green-red segment 2011b are in the light path, Figure 3a When the first filter section 2011 in the color wheel device is in the light path, the output of the light has the same color. When the first blue-red transparent section 2012a and the second blue-red transparent section 2012b are in the light path, the output of the light has the same color. Figure 3a The second filter section 2012 in the color wheel device shown has the same color light output when it is in the light path. The areas of the first green-red transparent section 2011a and the second green-red transparent section 2011b can be the same or different, and can be symmetrical or asymmetrical. Similarly, the first blue-red transparent section 2012a and the second blue-red transparent section 2012b are the same. The color wheel structure with more groups of blue-red and green-red transparent sections can be deduced in the same way, and will not be repeated here. In addition, when introducing the working principle of the color wheel above, the color wheel is rotated clockwise as an example, and the initial position is from Figure 3a and Figure 3bThe color wheel 201 starts from the intersection line 2010b shown, which is not intended to limit the present invention. It is understandable that the color wheel rotation cycle can also start from other intersection positions, or rotate counterclockwise, as long as the light source output and the spatial light modulator are synchronized accordingly. The sizes of the blue-red and green-red transparent segments of the color wheel device 201 should be comprehensively considered based on the proportion of each color in the spectrum of the light output by the light source system 100 and the target brightness after color correction that the projection system needs to meet, so as to achieve optimal efficiency. This also applies to other embodiments of the present application, which will not be repeated at that time.

[0061] In addition, the color wheel device 201 may also be provided with a transparent section, that is, as used in a single-chip DMD projection system, the section allows the transmission of the three primary colors of red, green and blue. In the present invention, when the transparent section is placed in the light path, the first light and the second light are transmitted at the same time, and the two lights are combined to emit in the form of white light, and by adjusting the output power of the second light, the color temperature of the output white light can be adjusted. The brightness of the display system can be enhanced through this section. One or more sections for transmitting auxiliary colors such as cyan, magenta or yellow can also be provided to better control the color gamut and brightness. This also applies to the remaining embodiments of the present invention, which will not be repeated at that time.

[0062] It should be noted that the red light, green light and blue light mentioned above are broad concepts. Each color of light can be composed of a combination of multiple wavelengths of light according to the color coordinates that are actually required to be met. It can be a narrow-band spectrum like a laser, a continuous spectrum of a certain width, or a combination of multiple discontinuous spectrums, all of which are within the scope of protection of the present invention. For example, a laser with a wavelength of 460nm to 470nm can directly meet the blue color required by the REC709 color gamut, and a laser with a wavelength of 440nm to 460nm plus a small amount of cyan light can also modulate a blue color that meets the REC709 color gamut. Taking this as an example, the second light generating device can be configured as a 440nm to 460nm laser array.

[0063] In such Figure 3a When the second filter section 2012 of the color wheel device shown is in the light path, or as Figure 3bWhen the first blue-red transparent section 2012a or the second blue-red transparent section 2012b of the color wheel device shown is in the optical path, the second light will pass through the color wheel device. Since the first light is also continuously output, in addition to the red light in the first light being able to pass through the color wheel and be guided to the first spatial light modulator 2041, the cyan to green light in the first light can also be partially transmitted when the color wheel device 201 is coated and designed, and guided to the second spatial light modulator 2042 together with the second light of 440nm to 460nm, so that they are modulated together as blue primary color light by the spatial light modulator 2042. This implementation is also applicable to other embodiments of the present invention, and is an advantage brought by the "first light continuously emitting light", one of the key features of the present invention, and therefore is within the protection scope of the present invention.

[0064] The light splitting and combining device 203 separates the blue-green light and the red light in the light beam guided from the light homogenizing device 202 , and the red light is guided to the first spatial light modulator 2041 , and the blue or green light is guided to the second spatial light modulator 2042 .

[0065] In such Figure 3a In the structure of the color wheel device 201 shown, in one complete rotation cycle, the spatial light modulator 2041 can continuously receive red light, the second spatial light modulator 2042 can receive green light when the first filter section 2011 of the color wheel is in the light path, and receive blue light when the second filter section 2012 is in the light path, and the two spatial light modulators modulate the received different primary color lights respectively. Taking into account the visual persistence effect of the human eye, as long as the rotation speed of the color wheel is fast enough, and the required color light can always be output when the incident light beam passes through the section of the color wheel, then, in one rotation cycle of the color wheel, the three primary colors of red, green and blue will all be modulated, and after being combined, they will be transmitted to the screen by the projection lens 301, so as to realize the modulated output of any given color image. Figure 3b The color wheel shown here is different only in that the blue light and the green light are output twice in one rotation cycle of the color wheel, which is equivalent to increasing the rotation speed of the color wheel and further reducing the color interruption effect.

[0066] It is understandable that each functional device in the schematic diagram may be only one device or a combination of multiple devices. In addition, the optical guiding device from one optical device to another optical device in the optical path is not specifically drawn, which is actually necessary, and this is only to make the description of the intention of the corresponding embodiment clearer and more concise, and is not intended to limit the present invention. Figure 2a , Figure 2b and Figure 2cThe relative positions of the two spatial light modulators in the figure are only for illustration and are not intended to limit the present invention. In the present application, the red light is directed to the first spatial light modulator 2041, and the blue or green light is directed to the second spatial light modulator 2042. The design of the light splitting and combining device 203 can also be adjusted according to actual needs to direct the red light to the second spatial light modulator 2042 and the blue or green light to the first spatial light modulator 2041. This also applies to other embodiments, which will not be described in detail.

[0067] Based on the above description of the embodiment of the present invention, the control system 401 is used to control the second light generating device 107 to generate the second light when the color wheel device 201 rotates to the point where the second filter section 2012 is in the light path according to the synchronization signal generated by the color wheel device 201, and to control the second spatial light modulator 2042 that modulates the blue-green light to modulate the blue light according to the blue component of the displayed image, and preferably to stop or weaken the generation of the second light when the color wheel rotates to the point where the first filter section 2011 is in the light path; to control the second spatial light modulator 2042 that modulates the blue-green light to modulate the green light according to the green component of the displayed image; and to control the first spatial light modulator 2041 that modulates the red light to continuously modulate the red light within one rotation cycle of the color wheel device 201 according to the red component of the displayed image.

[0068] like Figure 4a and Figure 5a As shown, in a Figure 3a In the rotation period T of the color wheel shown, the first light is always output, and the second light is normally output to the color wheel device only from the beginning of a color wheel rotation period to t1. In the period from t1 to T, it is preferred not to output or to reduce the power output to the color wheel device. Moreover, if the power output to the color wheel is reduced in the period from t1 to T, the part reaching the light splitting and combining device 203 after being filtered by the color wheel device can be ignored. t1 is a moment in the period T. Figure 3a In the color wheel device 201 shown, if the time when the boundary line 2010a of the two filter sections is in the light path in a rotation cycle is the start time of the cycle, then the time when the color wheel rotates clockwise to the time when the boundary line 2010b of the two filter sections is in the light path is time t1, and the time when the color wheel continues to rotate clockwise and the section boundary line 2010a is in the light path again is time T. Since the first light is continuously output, the red light can always be separated by the color wheel device 201 and the light-splitting and light-combining device 203 to provide to the spatial light modulator 2041, so that the spatial light modulator 2041 can always modulate red light in a color wheel rotation cycle T, while the spatial light modulator 2042 can modulate blue light only in the period from the beginning to t1 of a color wheel rotation cycle, and can modulate green light only in the period from t1 to T of a color wheel rotation cycle.

[0069] like Figure 4band Figure 5b As shown, in Figure 3b In the rotation period T of the color wheel device shown, the first light is always output, and the second light is output to the color wheel device only in the period from the beginning to t1 and the period from t2 to t3 of a color wheel rotation period. It is preferably not output or output to the color wheel device at a low power in the period from t1 to t2 and the period from t3 to T. Moreover, if the power is reduced to output to the color wheel in the period from t1 to t2 and the period from t3 to T, the part that reaches the light splitting and combining device 203 after being filtered by the color wheel device can be ignored. t1, t2, t3 are different moments in a period T. Figure 3b In the operation process of the color wheel device 201 shown, if the segment boundary 2010a is in the light path in a rotation cycle as the start time of the cycle, then the color wheel device 201 rotates clockwise to the segment boundary 2010b in the light path as time t1, the color wheel device 201 continues to rotate clockwise to the segment boundary 2010c in the light path as time t2, the color wheel device 201 continues to rotate clockwise to the segment boundary 2010d in the light path as time t3, and the color wheel continues to rotate clockwise when the segment boundary line 2010a is in the light path again as time T. Since the first light is continuously output, the red light can always be separated through the color wheel device 201 and the light-splitting and light-combining device 203 and provided to the spatial light modulator 2041, so that the spatial light modulator 2041 always has red light to modulate within a color wheel rotation period T, while the spatial light modulator 2042 has blue light to modulate only from the beginning to t1 and from t2 to t3 of a color wheel rotation period, and has green light to modulate only from t1 to t2 and from t3 to T of a color wheel rotation period.

[0070] It should be noted that the above description of the cycle of the color wheel device 201 is based on Figure 3a and Figure 3b The corresponding color wheel is taken as an example, starting from the segment junction 2010a in a clockwise direction, but this is only for the convenience of introducing the working principle of the present invention. In fact, it can also be counterclockwise, or a cycle can be started from the junction of two other segments. It’s just that the timing of the second light working and the modulation timing of the spatial light modulator will be different, all of which are within the protection scope of the present invention.

[0071] In this way, by time-sharing modulation of the blue and green light and continuous modulation of the red light, it is equivalent to avoiding the output of excess blue and green light by reducing the output time, and making full use of the relatively lacking red wavelength part in the light source spectrum, so that the three primary colors have a better ratio of white light with specified color coordinates, thereby achieving a color-corrected brightness close to that of a three-chip spatial light modulator projection system with a two-chip spatial light modulator projection system, and greatly reducing the cost. In addition, it also avoids the problems of higher heat dissipation requirements of the spatial light modulator and poor system contrast caused by excess green light.

[0072] Another form of the first embodiment of the present invention is as follows Figure 2b As shown, Figure 2a The embodiment shown differs in that Figure 2a In the corresponding embodiment, the excitation light generated by the excitation light generating device 101 is transmitted by the filter device 102 and then guided to the wavelength conversion device 103, and the wavelength conversion material is excited to generate the converted light, which is reflected by the filter device 102 and then guided to the color wheel device 201, and the second light generating device 107 is transmitted by the filter device 102 and then guided to the color wheel device 201; Figure 2b In the embodiment shown, the excitation light generated by the excitation light generating device 101 is reflected by the filter device 102 and then guided to the wavelength conversion device 103, which excites the wavelength conversion material to generate the converted light, which is then transmitted by the filter device 102 and then guided to the color wheel device 201. The second light generating device 107 is reflected by the filter device 102 and then guided to the color wheel device 201. The subsequent implementation process is the same as Figure 2a The implementation process of the structure shown is the same and will not be repeated here.

[0073] In the first embodiment provided by the present invention, Figure 2a and Figure 2b The light sources shown are two preferred structures of the light source system 100. The light source system 100 may also be any other structure capable of guiding at least part of the stimulated light generated by the continuous excitation wavelength conversion material as the first light and at least part of the second light generated by the second light generating device to the color wheel device 201. Figure 2c The structure shown is equivalent to Figure 2b The filter device 102 in the light source system shown is implemented by dividing into two parts: a first filter device 102a and a second filter device 102b. Figure 2a and Figure 2b The structures shown are consistent and will not be described in detail here. Figure 2c and Figure 2a and Figure 2bThe difference is that the excitation light generating device 101 (first light source) continuously generates excitation light, which is reflected by the filter device 102 and then goes along the optical path to the wavelength conversion device 103. The wavelength conversion material on the wavelength conversion device 103 is excited by the excitation light to generate stimulated light, which is emitted in the opposite direction of the excitation light path and sequentially enters the first filter device 102a and the second filter device 102b. The emitted light portion after transmission is the first light. The first light is guided to the color wheel device 201 along the optical path; the emitted light of the second light source is reflected by the second filter device 102b and then enters the color wheel device 201.

[0074] In the light source system 100, the excitation light generating device 101 can be any light source capable of outputting ultraviolet light or blue light, preferably an ultraviolet light or blue light laser array; the second light generating device can be any light source capable of outputting blue light, preferably a blue light laser array; the wavelength conversion device 103 can be a static or dynamic device carrying a wavelength conversion material, preferably a rotatable wheel structure carrying a circle of wavelength conversion material on the surface; the wavelength conversion material can be any material capable of emitting green light and red light under the action of the excitation light, preferably a yellow fluorescent material; the order of the first light and the second light is a relative concept and can be interchangeable; the order of the three primary colors of light is a relative concept and can be in any order, preferably red light, green light, and blue light; the spatial light modulator can be any type of DMD, LCD, LCOS, etc., preferably DMD.

[0075] Furthermore, the present invention also provides another color wheel device 201 having three filter sections, such as Figure 3c to Figure 3e As shown:

[0076] Combination Figure 2a The display device shown, Figure 3c The color wheel structure shown, and Figure 4c and Figure 5c Another implementation method of the first embodiment of the present invention is described in the timing diagram of:

[0077] The first light source 101 continuously generates excitation light, which is transmitted through the filter device 102 and then travels along the optical path to the wavelength conversion device 103. The wavelength conversion material on the wavelength conversion device 103 is excited by the excitation light to generate stimulated light, which is emitted to the filter device 102 in the opposite direction of the excitation light optical path and is reflected by the filter device 102. The reflected part is the first light. The color wheel device 201 rotates so that the green-red filter section 2011, the blue-red filter section 2012, and the white-light filter section 2013 are alternately placed in the optical path.

[0078] The control system 401 receives the rotation state of the color wheel device and obtains which specific filter section is currently located in the light path, thereby controlling the on and off of the second light source and the working states of the first spatial light modulator 2041 and the second spatial light modulator 2042 .

[0079] like Figure 4c and Figure 5c As shown, in a Figure 3c In the rotation period T of the color wheel shown, the first light is always output to the color wheel of the color wheel device 201, and the second light is normally output to the color wheel device 201 from the beginning of a color wheel rotation period to the time period t1. This time period corresponds to the blue-red filter section 2012 of the color wheel device 201 being in the light path, the blue-red light is transmitted, and the other light is reflected. The transmitted blue-red light is split by the light splitting and light combining device 203, the red light is guided to the first spatial light modulator 2041, and the blue light is guided to the second spatial light modulator 2042. The first spatial light modulator 2041 modulates the red light, and the second spatial light modulator 2042 modulates the blue light in time periods. The modulated red light and blue light are then combined by the light splitting and light combining device 203 and transmitted to the screen through the projection lens 301.

[0080] In the period from t1 to t2, it is preferred that the second light source does not output or reduces the power output to the color wheel device 201. This period corresponds to the green-red filter section 2011 of the color wheel being in the light path, and if the power output to the color wheel is reduced in the period from t1 to t2, the part that reaches the light-splitting and light-combining device 203 after filtering by the color wheel device 201 can be ignored. In this section, red and green light are transmitted, and other light is reflected. The transmitted red and green light are split by the light-splitting and light-combining device 203, and the red light is guided to the first spatial light modulator 2041, and the green light is guided to the second spatial light modulator 2042. The first spatial light modulator 2041 modulates the red light, and the second spatial light modulator 2042 modulates the green light. The modulated red and green light are then combined by the light-splitting and light-combining device 203 and transmitted to the screen through the projection lens 301.

[0081] In the time period from t2 to T, the first light and the second light are output to the color wheel device 201 at the same time, but the power and the time period from the beginning of a color wheel rotation cycle to t1 may be different. This time period corresponds to the white light filter section 2013 of the color wheel being in the light path. In order to obtain white light that meets the specified color temperature requirements, the output power of the second light can be adjusted. In this section, red, green and blue light can be at least partially transmitted. The transmitted red, green and blue light are split by the light splitting and combining device 203, and the red light is guided to the first spatial light modulator 2041, and the green light and the blue light are guided to the second spatial light modulator 2042. The first spatial light modulator 2041 modulates the red light, and the second spatial light modulator 2042 modulates the cyan light composed of the blue light and the green light. The modulated red light and cyan light are combined (white light) by the light splitting and combining device 203 and transmitted to the screen through the projection lens 301.

[0082] Among them, t1 and t2 are two moments in the period T. Figure 3c In the color wheel shown, if the segment junction 2010a is in the light path in a rotation cycle, it is the start time of the cycle. Then, when the color wheel rotates counterclockwise to the segment junction 2010b in the light path, it is time t1. When the segment junction 2010c is in the light path after continuing to rotate, it is time t2. When the segment junction 2010a is in the light path again after continuing to rotate, it is time T. Since the first light is continuously output, the red light can be always separated by the color wheel device 201 and the light-splitting and light-combining device 203 to provide to the first spatial light modulator 2041, so that the spatial light modulator 2041 always modulates the red light in a color wheel rotation cycle T, and the second spatial light modulator 2042 modulates the blue light from the beginning to t1 of a color wheel rotation cycle, modulates the green light from t1 to t2 of a color wheel rotation cycle, and simultaneously modulates the blue-green light (cyan light) from t2 to T of a color wheel rotation cycle.

[0083] exist Figure 4c The waveform of the second light working state only indicates whether the light is output or not, but does not indicate that the power is variable when output. This is only to make the schematic diagram simple and is not intended to limit the technical solution of the present invention.

[0084] It should be noted that the above description of the cycle of the color wheel device 201 is based on Figure 3c The corresponding color wheel starts from the segment junction 2010s in a clockwise direction as an example, but this is only for the convenience of introducing the working principle of the present invention. In fact, it can also be counterclockwise, or a cycle can be started from the junction of other two segments. It’s just that the timing of the second light working and the modulation timing of the spatial light modulator will be different. It only needs to make the light source output and the spatial light modulator synchronized accordingly.

[0085] Figure 2b to Figure 2c , Figures 6a to 6d If the display device shown uses Figure 3c The color wheel shown here works in the same way as Figure 2a The working principle of the display device shown is consistent with the description and will not be repeated here.

[0086] The white light filter section 2013 allows the three primary colors to be output simultaneously. Although this section does not contribute to the color performance of the projector, it can greatly increase the display brightness of the projector. By selecting the appropriate area size of the white light filter section 2013, the best balance between the color performance and brightness performance of the projector can be found. When the white light filter section 2013 is in the optical path, the output power of the first light or the second light can be adjusted so that the white light output by the display device when the section is placed in the optical path meets the specified color temperature requirements. The transmittance of different wavelength ranges can also be adjusted by adjusting the coating of the white light filter section so that the light transmitted through the white light section displayed on the screen meets the specified color temperature requirements.

[0087] The various filtering segments of the color wheel device 201 and the subsequent light splitting and combining device 203 in the optical path can provide the two spatial light modulators with the three primary colors of light required to display color images. The size of each segment should be comprehensively considered based on the proportion of each color in the spectrum of the output light of the light source system 100 and the target brightness after color correction that the projection system needs to meet, so as to achieve optimal efficiency.

[0088] Figure 3c The color wheel shown has only one blue-red, one green-red and one white-light-transmitting filter segment, but can also be composed of two blue-red, two green-red and one to two white-light-transmitting segments, or even a combination of more different filter segments.

[0089] like Figure 3d The color wheel device 201 has two blue-red and two green-red sections plus one white-light section, that is, five sections, namely, green-red filter sections 2011a and 2011b, blue-red filter sections 2012a and 2012b, and white-light filter section 2013. Figure 3a The color wheel 2011 has the same color filtering function, and the blue-red filter segment 2012a and the blue-red filter segment 2012b have the same color filtering function. Figure 3a The color wheel 2012 has the same color filtering function as the white light filtering section 2013. Figure 3a The white light filtering section 2013 shown has the same color filtering function.

[0090] like Figure 3e The color wheel device 201 in the technical solution of the present invention is another structure. Figure 3dThe color wheel shown has two blue-red and green-red filtering sections as well as two white-light filtering sections. Increasing the number of sections and distributing the sections at intervals can help reduce the color interruption effect. In actual use, increasing the sections according to the ratio of the primary colors is equivalent to increasing the color wheel speed. All of the above variations are within the scope of protection of the present invention.

[0091] The second embodiment of the display device provided by the present invention is now described. Figure 6a and Figure 6b This is a schematic structural diagram of a second embodiment provided by the present invention.

[0092] The difference between this embodiment and embodiment 1 is that the light source system 100 adds a supplementary light generating device 118 capable of generating at least part of red light, the filtering function of the filter device 102 is adjusted, and the rest is the same as the first embodiment. It should be noted that the supplementary light emitting device 118 and the excitation light generating device 101 work synchronously and continuously.

[0093] like Figure 6a As shown,

[0094] The light emitted by the supplementary light generating device 118 is transmitted by the filtering device 102, and the light emitted by the supplementary light generating device 118 is combined with the first light emitted by the excitation light generating device 101. The light emitted by the supplementary light generating device 118 becomes the second part of the first light on the light path emitted from the filtering device 102 to the color wheel device 201. The first light enters the light homogenizing device 202 after being filtered by the color wheel device 201. The remaining steps are the same as those in the first embodiment and will not be repeated here.

[0095] The second light generating device 107 generates second light, which is transmitted by the filter device 102 and then guided to the color wheel device 201 along the same optical path as the first light. The portion that passes through the color wheel device 201 enters the light homogenizing device 202 .

[0096] Similar to the first embodiment, when the filtering function of the filter device 102 or the color wheel device 201 needs to be enhanced due to the difficulty of coating design, or the projection system has additional requirements for the color gamut, or other reasons, an optional auxiliary filtering device 109 can be added between the two to achieve the target filtering requirements.

[0097] Furthermore, the light source system 100 can be configured as follows: Figure 6a The corresponding structure shown in Figure 6b The corresponding structure shown. Figure 6b The light source system 100 shown in FIG. Figure 6b As shown,

[0098] The light emitted by the supplementary light generating device 118 is reflected by the filter device 102 and passes through the auxiliary filter device 109 as the second part of the first light, and is combined with the first part of the first light that is reflected by the wavelength conversion device 103 and transmitted from the filter device 102 to form the first light in this figure. The first part of the first light is: after the excitation light generated by the excitation light generating device 101 is reflected by the filter device 102 and guided to the wavelength conversion device 103, the wavelength conversion material on the wavelength conversion device 103 is excited by the excitation light to generate the stimulated light, and the stimulated light is emitted to the filter device 102 along the opposite direction of the excitation light path, and is partially transmitted by the filter device 102. The first part and the second part of the first light are combined and guided to the color wheel device 201, and enter the light homogenizing device 202 after being filtered by the color wheel device 201. The second light generating device 107 generates the second light, which is reflected by the filter device 102 and guided to the color wheel device 201 along the same optical path as the first light. The part that passes through the color wheel device 201 enters the light homogenizing device 202. The remaining steps are the same as those in the first embodiment and will not be repeated here.

[0099] Similar to the first embodiment, in this embodiment, when the filter device 102 or the color wheel device 201 needs to enhance its filtering function due to the difficulty of coating design, or the projection system has additional requirements for the color gamut, or other reasons, an optional auxiliary filter device 109 can be added between the two to achieve the target filtering requirements. The introduction of the supplementary light emitting device 118 can improve the brightness and color coordinates of the red part in the first light, which helps to make the light source system more efficient and energy-saving.

[0100] In this embodiment, if Figure 6a and Figure 6bThe light sources shown are two preferred structures of the light source system 100. The light source system may also be any other structure that can guide at least part of the stimulated light generated by the continuous excitation wavelength conversion material and the continuously output red light supplementary light as the first light and at least part of the second light generated by the second light generating device to the color wheel device 201; in the light source system, the excitation light generating device 101 can be any light source that can output ultraviolet light or blue light, preferably an ultraviolet light or blue light laser array; the second light generating device is any light source that can output blue light, preferably a blue light laser array; the supplementary light emitting device is any light source that can output red light, preferably an ultraviolet light or blue light laser array. A red light laser array is selected; the wavelength conversion device 103 can be a static or dynamic device carrying a wavelength conversion material, and preferably a rotatable wheel structure carrying a circle of wavelength conversion material on the surface; the wavelength conversion material can be any material that can excite green light and red light under the action of excitation light, and preferably a yellow fluorescent material; the order of the first light and the second light is a relative concept and can be interchangeable; the order of the three primary colors of light is a relative concept and can be in any order, and preferably red light, green light, and blue light; the spatial light modulator can be any type of DMD, LCD, LCOS, etc., and preferably DMD.

[0101] During the normal display of an image by the display system, the excitation light generating device 101 in the light source system 100 continuously generates excitation light to stimulate the wavelength conversion material on the wavelength conversion device 103 to continuously generate stimulated light, and the supplementary light emitting device 118 also continuously outputs supplementary light, so that the first light synthesized by the two parts can be continuously output to the color wheel device 201; the second light generating device 107 outputs the second light to the color wheel device 201 in time periods. The subsequent structure of the optical path, the working principle of the subsequent structure, and the working principle of the control system 401 are consistent with those of the first embodiment and will not be repeated here.

[0102] The third embodiment of the display device provided by the present invention is now described. Figure 6c and Figure 6d This is a schematic structural diagram of the third embodiment provided by the present invention.

[0103] The difference between this embodiment and the first embodiment is that the second light generating device of the light source system 100 includes two color light generating devices, namely a blue photon light source 117 capable of generating at least part of blue light and a green photon light source 108 capable of generating at least part of green light. The two color light generating devices can work independently and in time-sharing, and the filtering function of the filtering device 102 and the working mode of the control system 401 are also adjusted accordingly.

[0104] like Figure 6cAs shown, the light source system includes an excitation light generating device 101 , a wavelength conversion device 103 , a blue photon light source 117 , a green photon light source 108 , a filtering device 102 , and an optional auxiliary filtering device 109 .

[0105] In this structure, the excitation light generating device 101 generates excitation light, and the excitation light is guided to the wavelength conversion material of the wavelength conversion device 103 after passing through the filter device 102. The wavelength conversion material is excited by the excitation light to generate the stimulated light, and the stimulated light is emitted to the filter device 102 along the opposite direction of the excitation light path, and is partially reflected by the filter device 102. The reflected light portion is the first light.

[0106] The light emitted by the blue photon light source 117 and the green photon light source 108 is transmitted by the filter device 102 and constitutes the second light.

[0107] The second light and the first light are guided to the color wheel device 201 along the same optical path, and enter the light homogenizing device 202 after being filtered by the color wheel device 201 .

[0108] The light emitted by the light homogenizing device 202 is guided to the light splitting and combining device 203. After being split by the light splitting and combining device 203, the red light is guided to the first spatial light modulator 2041, and the blue light or the green light is guided to the second spatial light modulator 2042. The two parts of light are modulated separately by the two spatial light modulators and then combined by the light splitting and combining device 203, and transmitted to the screen through the projection lens.

[0109] The light source system 100 can be Figure 6c The structure shown in Figure 6d The structure shown.

[0110] according to Figure 6d The light source system 100 shown includes an excitation light generating device 101 , a wavelength conversion device 103 , a blue photon light source 117 , a green photon light source 108 , a filtering device 102 , and an auxiliary filtering device 109 .

[0111] The excitation light generating device 101 generates excitation light. After being reflected by the filter device 102, the excitation light is guided to the wavelength conversion material of the wavelength conversion device 103. The wavelength conversion material is excited by the excitation light to generate stimulated light. The stimulated light is emitted to the filter device 102 along the opposite direction of the excitation light path and is partially transmitted by the filter device 102. The transmitted part constitutes the first light.

[0112] The light generated by the blue photon light source 117 and the green photon light source 108 is reflected by the filter device 102 to form the second light. The second light is guided to the color wheel device 201 along the same optical path as the first light, and enters the light homogenizing device 202 after being filtered by the color wheel device 201. The light emitted by the green photon light source 108 is guided to be reflected by the filter device 102 to form the second part of the second light, and the light emitted by the green photon light source 108 is guided to be reflected by the filter device 102 to form the second part of the second light. The first part and the second part of the second light are guided to the color wheel device 201 along the same optical path as the first light, and enter the light homogenizing device 202 after being filtered by the color wheel device 201. The light emitted by the light homogenizing device is guided to the light splitting and combining device 203. After being split by the light splitting and combining device 203, the red light is guided to the spatial light modulator 2041, and the green light or the blue light is guided to the spatial light modulator 2042. The two parts of light are modulated separately by the two spatial light modulators and then combined by the light splitting and combining device 203, and transmitted to the screen through the projection lens.

[0113] Among them, similar to the first and second embodiments, in the third embodiment, when the filtering function of the filter device 102 or the color wheel device 201 needs to be enhanced due to the difficulty of coating design, or the projection system has additional requirements for the color gamut, or other various reasons, an auxiliary filtering device 109 can be added between the two to achieve the target filtering requirements.

[0114] In this embodiment, the introduction of the green photon light source 108 can improve the color coordinates and brightness of the green part in the first light. By giving the green light a shorter working time when designing the filter section in the color wheel device and increasing the passage time of the blue light, the power of the blue primary light generating device is reduced, which helps to make the projection system more efficient and reduce costs.

[0115] In this embodiment, if Figure 6c and Figure 6dThe light sources shown are two preferred structures of the light source system 100. The light source system may also be any other structure capable of guiding at least part of the stimulated light generated by the continuous excitation wavelength conversion material as the first light and at least part of the second light generated by the second light generating device to the color wheel device 201. In the light source system, the excitation light generating device 101 may be any light source capable of outputting ultraviolet light or blue light, preferably an ultraviolet light or blue light laser array; the blue photon light source 117 is any light source capable of outputting blue light, preferably a blue light laser array; the green photon light source 108 is any light source capable of outputting green light, preferably a green light laser array. light array; the wavelength conversion device 103 can be a static or dynamic device carrying a wavelength conversion material, preferably a rotatable wheel structure with a circle of wavelength conversion material on the surface; the wavelength conversion material can be any material that can excite green light and red light under the action of excitation light, preferably a yellow fluorescent material; the order of the first light and the second light is a relative concept and can be interchangeable; the order of the three primary colors of light is a relative concept and can be in any order, preferably red light, green light, and blue light; the spatial light modulator can be any type of DMD, LCD, LCOS, etc., preferably DMD.

[0116] During the normal display of an image by the display device, the excitation light generating device 101 in the light source system 100 continuously generates excitation light to excite the wavelength conversion material on the wavelength conversion device 103 to continuously generate stimulated light. Since there are only two spatial light modulators in the light source, in the light source using laser fluorescent materials, it is preferred that the red primary color light occupies the first spatial light modulator 2041 alone, while the blue and green primary color lights (the blue photon light source 117 and the green photon light source 108) share the second spatial light modulator 2042. The modulation time setting of the spatial light modulator can be divided into two time periods on a color wheel rotation cycle, namely the blue light period and the green light period, which are the same as Figure 3a and Figure 3b The different segments in the color wheel shown correspond.

[0117] During the blue light period, Figure 3a The second filter section 2012 in the color wheel shown or as Figure 3bThe first transparent blue-red segment 2012a or the second transparent blue-red segment 2012b in the color wheel shown is in the light path. During this period, the red light in the first light will be transmitted by the color wheel device 201. At the same time, the first part of the second light generating device: the blue photon light source 117 outputs blue light, which is also transmitted by the color wheel device 201. After being homogenized by the light homogenizing device 202, it is split by the light splitting and combining device 203. The split red light is guided to the first spatial light modulator 2041, and the split blue light is guided to the second spatial light modulator 2042. After the two spatial light modulators modulate them respectively, they are combined by the light splitting and combining device 203 and projected onto the screen through the projection lens 301.

[0118] During the green light period, Figure 3a The first filter section 2011 in the color wheel shown or as Figure 3b The first green-red segment 2011a or the second green-red segment 2011b in the color wheel shown is in the light path. During this period, the red light and part of the green light in the first light will be transmitted by the color wheel device 201. At the same time, the second part of the second light generating device: the green photon light source 108 outputs another part of the green light, which is also transmitted by the color wheel device 201. After being homogenized by the light homogenizing device 202, it is split by the light splitting and combining device 203. The split red light is guided to the first spatial light modulator 2041, and the split green light is guided to the second spatial light modulator 2042. After the two spatial light modulators modulate them respectively, they are combined by the light splitting and combining device 203 and projected onto the screen through the projection lens 301.

[0119] In this way, blue light and green light are modulated respectively in the blue light period and the green light period, while red light can be continuously modulated in both periods. The red, green and blue components of any image can be modulated in this way. Considering the visual persistence effect of the human eye, as long as the color wheel rotates fast enough, people can see the corresponding image on the screen.

[0120] The control system 401 is used to control the blue light source 117 according to the synchronization signal generated by the color wheel device 201. Figure 3a When the color wheel shown rotates until the second filter section 2012 is in the light path, or when Figure 3b When the color wheel shown in FIG. 1 rotates to the point where the first blue-red transparent segment 2012a or the second blue-red transparent segment 2012b is in the light path, blue light is generated, and the second spatial light modulator 2042 for modulating blue-green light is controlled to modulate the blue light according to the blue component of the displayed image; Figure 3a When the color wheel shown in FIG. 1 is rotated to the point where the first filter section 2011 is in the light path, or when Figure 3bWhen the color wheel shown rotates to the point where the first green-red transmissive segment 2011a or the second green-red transmissive segment 2011b is in the light path, the green photon light source 108 is controlled to generate partial green light, and the second spatial light modulator 2042 for modulating blue and green light is controlled to modulate the green light according to the green component of the displayed image; the first spatial light modulator 2041 for modulating red light is controlled to continuously modulate the red light according to the red component of the displayed image within one rotation cycle of the color wheel device.

[0121] In the above embodiments, the generation of the first light has independent wavelength conversion material excitation light paths and laser guided light paths. In fact, the first light of the light source system 100 can also be directly generated by the first light generating device 110. Therefore, the present invention also provides a fourth embodiment of the display device:

[0122] like Figure 7 As shown, the first light generating device 110 emits a first light including red light and green light. The first light and the second light can be used as follows Figure 7 The light combining method shown in the figure can also be directed to the color wheel device 201 in any other feasible manner. Figure 7 The working principles of the filter device 102, the auxiliary filter device 109 and the parts other than the light source system 100 are the same as those in Example 1. The working principle of the control system 401 is also the same as that in Example 1, and the first and second primary color supplementary lights can be further introduced as in the second and third embodiments. The remaining working principles are the same and will not be repeated here.

[0123] The control method provided by the present invention is now described based on the above display device and light source, specifically:

[0124] In a cycle corresponding to one rotation of the color wheel, the first light is continuously output, and the working state of the second light changes with the change of the state of the color wheel device 201. The color wheel device 201 includes at least two filter sections: a first filter section 2011 transmitting the first primary color and the second primary color, and a second filter section 2012 transmitting the first primary color and the third primary color.

[0125] The control system 401 adjusts the working state of the first light and the second light according to the position and time of various filtering sections in the color wheel device 201. Specifically, when the first section 2011 enters the optical path, which is the first time period, the control system 401 controls the output of the first light, and controls the output of the second light to preferably stop or weaken. At the same time, the control system 401 controls the first spatial light modulator 2041 to modulate the red light in the first light, and controls the second spatial light modulator 2042 to modulate the green light in the first light.

[0126] When the first segment 2011 leaves the optical path and the second segment 2012 enters the optical path, this is the second time period. The control system 401 controls the first light to maintain output and controls the output of the second light. The control system 401 controls the second spatial light modulator to modulate the blue light in the second light, and the first spatial light modulator to modulate the red light in the first light.

[0127] The second light may include only blue light, or may include, in addition to the blue light, also include at least a portion of green light that is output in a time-sharing manner with the blue light.

[0128] When the second light includes the second primary color and blue light, the green light portion of the second light is output in the first time period, and is guided to the second spatial light modulator 2042 together with the green light of the first light and modulated, while the blue light portion is not output or the output is weakened; in the second time period, the blue light portion of the second light is output and is guided to the second spatial light modulator 2042 and modulated, and the green light in the second light is not output or the output is weakened.

[0129] Details:

[0130] In a cycle corresponding to one rotation of the color wheel, the first light source (excitation light generating device 101) continuously outputs, and the working state of the second light source changes with the change of the state of the color wheel device. The light emitted by the second light source is a second light of only blue light, or a second light containing green light and blue light. When the light emitted by the second light source is a second light containing green light and blue light, the second spatial light modulator does not modulate the green light at the second moment. The color wheel device includes at least two filter sections: a first filter section 2011 that transmits the first primary color and the second primary color, and a second filter section 2012 that transmits the third primary color and the first primary color.

[0131] When the light emitted by the second light source is the second light of only blue light:

[0132] Assume that the first filter section 2011 in the color wheel device is in the optical path, which is the first moment. The control system controls the second light source to stop or weaken the output. The first light passes through the color wheel device and is separated into red light and green light by the light-splitting and light-combining device 203. The red light is guided to the first spatial light modulator 2041, and the green light is guided to the second spatial light modulator 2042. The control system controls the first spatial light modulator 2041 to modulate the red light, and controls the second spatial light modulator 2042 to modulate the green light. The modulated light is combined by the light-splitting and light-combining device 203, then enters the lens 301 and is output to the screen. When the color wheel device rotates to the second filter section 2012 in the light path, this is the second moment. The control system controls the first light to continue to output and controls the second light source to increase or start to emit blue light. The first light and the second light pass through the color wheel device and are separated into red light and blue light by the light splitting and combining device 203. The red light is guided to the first spatial light modulator 2041, and the blue light is guided to the second spatial light modulator 2042. The control system controls the second spatial light modulator 2042 to modulate the blue light and controls the first spatial light modulator 2041 to modulate the red light. The modulated light is combined by the light splitting and combining device 203 and then emitted into the lens 301 and output to the screen.

[0133] When the light emitted by the second light source is the second light including blue light and green light:

[0134] Assume that the first filter section 2011 in the color wheel device is in the optical path, which is the first moment. The control system controls the second light source to stop or weaken the output. The first light passes through the color wheel device and is separated into red light and green light by the light splitting and light combining device 203. The red light is guided to the first spatial light modulator 2041, and the green light is guided to the second spatial light modulator 2042. The control system controls the first spatial light modulator 2041 to modulate the red light, and controls the second spatial light modulator 2042 to modulate the green light. The modulated light is combined by the light splitting and light combining device 203, then enters the lens 301 and is output to the screen. When the color wheel device rotates to the second filter section 2012 in the optical path, which is the second moment, the control system controls the first light to continue to output and controls the second light source to start emitting blue light or green light according to the needs of the current light source system. The first light and the second light pass through the color wheel device, and are separated into red light and blue light or red light and green light by the light splitting and light combining device 203. The control system controls the second spatial light modulator 2042 to modulate the blue light or the green light, and controls the first spatial light modulator 2041 to modulate the red light. The modulated light is combined by the light splitting and light combining device 203, and then enters the lens 301 and is output to the screen. It should be noted that the control system controls the second spatial light modulator 2042 to modulate the blue light or the green light specifically by giving the green light a shorter / longer working time when designing the filter section in the color wheel device according to actual needs, and increasing / decreasing the passing time of the blue light, thereby changing the power of the blue primary color light generating device.

[0135] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display device, characterized in that: include: A light source system, comprising a first light source capable of continuously outputting a first light, and a second light source capable of non-continuously outputting a second light; wherein the first light is light emitted by the first light source and converted by a wavelength conversion material, or the first light is directly generated by the first light source; The first light includes at least red light and green light, and the second light includes at least blue light, and the green light may exist in both the first light and the second light; A color wheel device, used for transmitting different primary color lights; the color wheel device comprises at least two types of sections, each type of section has one or more sections, and after the color wheel device is placed in the light path, the various sections are rotated to be in the light path in turn, and a synchronization signal is sent to the control system according to the status of the different sections in the light path; specifically, when the first type of section is in the light path, the color wheel device transmits the red light and the green light and sends a signal to the light source system to output the first light source and attenuate or turn off the second light source, and when the second type of section is in the light path, the color wheel device transmits the red light and the blue light and sends a signal to the light source system to output the second light; Two spatial light modulators, including a first spatial light modulator and a second spatial light modulator for modulating different primary color lights, wherein the second spatial light modulator modulates green light or blue light in time periods according to the synchronization signal; A light splitting and combining device is disposed after the color wheel device, and is used to guide the red light filtered by the color wheel device to the first spatial light modulator, guide the green light or blue light part to the second spatial light modulator, and output the combined light of each primary color after being modulated by the first spatial light modulator and the second spatial light modulator; A control system is used to control the second light source to stop or weaken the output of blue light and control the second spatial light modulator to modulate green light during this period when the first section of the color wheel device is in the light path according to the synchronization signal generated by the color wheel device; when the second section of the color wheel device is in the light path, control the second light source to output blue light and control the second spatial light modulator to modulate blue light during this period; when the color wheel device is operating, the control system controls the first spatial light modulator to continuously modulate red light.

2. A display device according to claim 1, characterized in that: When the color wheel device has a third segment and it is in the light path, the segment can transmit part of the red light, part of the green light and part of the blue light.

3. A display device according to claim 1, characterized in that: The wavelength of the light output by the second light source is 440nm to 460nm, and the second section of the color wheel device can transmit part of the green light in the light emitted by the first light source according to the color coordinate requirement of the blue light.

4. A display device according to claim 1, characterized in that: It also includes a supplementary light generating device for emitting supplementary light of the red light.

5. A display device according to claim 1, characterized in that: It also includes an auxiliary filtering device, which is placed after the wavelength conversion device having the wavelength conversion material in the optical path and is used for secondary filtering of the converted light.

6. A display device according to claim 1, characterized in that: The second light source includes a blue light source and a green light source, and the blue light source and the green light source are used to output the second light including the blue light and the green light in a set period according to the control of the control system.

7. A display method, characterized in that: include: In one cycle, the first light is continuously output, and the working state of the second light changes with the change of the state of the color wheel device; The working states of the first light and the second light are adjusted according to the positions and moments of the filtering sections in the color wheel device. When the first section enters the optical path, which is a first time period, the control system controls the output of the first light and controls the output of the second light to stop or weaken. At the same time, the control system controls the first spatial light modulator to modulate the red light in the first light and controls the second spatial light modulator to modulate the green light in the first light. When the first segment leaves the optical path and the second segment enters the optical path, this is a second time period, the control system controls the first light to maintain output and controls the output of the second light, the control system controls the second spatial light modulator to modulate the blue light in the second light, and the first spatial light modulator to modulate the red light in the first light; wherein the color wheel device includes at least two filtering segments: a first filtering segment that transmits red light and green light and a second filtering segment that transmits red light and blue light.

8. The display method according to claim 7, characterized in that: The second light may include only blue light, or may include, in addition to the blue light, also include at least a portion of green light output in a time-sharing manner with the blue light; When the second light includes green light and blue light, the green light in the second light is output in the first period and guided to the second spatial light modulator together with the green light of the first light and modulated. In the second period, the green light in the second light is not output or is output at a reduced level.

Images