Projection equipment, display processing method thereof and projection system

Abstract

The invention discloses projection equipment, a display processing method thereof and a projection system. The projection equipment comprises a laser light source device, an illumination system and a projection lens, the illumination system comprises a light modulator used for performing modulation according to incident light of an image to be displayed to form a display image. According to the projection lens, at least one phase compensation device is arranged on the light emitting side of the light modulation device, the phase compensation device can perform phase compensation on imaging light and can also perform spacing compensation on lenses in the projection lens according to requirements, and the problems of resolution reduction and lens color separation caused by temperature drift can be solved.

Description

Technical Field

[0001] The present invention relates to the field of projection technology, and in particular to a projection device, a display processing method thereof, and a projection system. Background Art

[0002] With the popularity of laser display products, laser display products have begun to enter thousands of households as large-screen products to replace TVs. Laser TVs are usually equipped with ultra-short-throw projection lenses. Ultra-short-throw projection lenses have a small projection ratio and can achieve large-size projection at a short distance, so they are widely used.

[0003] As user demands increase, the requirements for the projection ratio and image quality of projection lenses are getting higher and higher. However, the lower the projection ratio, the smaller the focal depth of the projected image, which not only makes the design more complicated, but also increases the difficulty of processing and reduces the yield rate. At the same time, under high-brightness display, the image resolution will become worse and worse over time. In addition, for the three-color laser projection system, due to the use of a large number of lenses in the projection lens, there will be problems such as color separation. Summary of the invention

[0004] According to a first aspect of an embodiment of the present invention, a projection device is provided, including:

[0005] A laser light source device, used for emitting an illumination light beam;

[0006] An illumination system, located at the light-emitting side of the laser light source device, for shaping and modulating incident light; the illumination system includes a light modulation device for modulating the incident light according to the image to be displayed to form a display image;

[0007] A projection lens, located at the light-emitting side of the light modulation device, for imaging the formed display image;

[0008] At least one phase compensation device is located at the light output side of the optical modulation device and is used to compensate the phase of the incident light.

[0009] In some embodiments of the present invention, the projection lens is an ultra-short-throw projection lens, and the ultra-short-throw projection lens includes: a refraction system and a reflection system;

[0010] The refraction system comprises: a rear mirror group, a middle mirror group and a front mirror group arranged in sequence in a direction gradually away from the light modulation device; the reflection system is located on a side of the front mirror group away from the middle mirror group;

[0011] The phase compensation device is located in the projection lens, or between the light modulation device and the projection lens.

[0012] In some embodiments of the present invention, the phase compensation device is located between the rear group mirror assembly and the middle group mirror assembly;

[0013] Alternatively, the phase compensation device is located between the middle group lens group and the front group lens group;

[0014] Alternatively, the phase compensation device is located between the front group of mirrors and the reflection system;

[0015] Alternatively, the phase compensation device is located between two adjacent lenses in the rear lens group;

[0016] Alternatively, the phase compensation device is located between the light modulation device and the rear mirror group.

[0017] In some embodiments of the present invention, each phase compensation device in the projection device is a reflective phase compensation device and / or a transmissive phase compensation device.

[0018] In some embodiments of the present invention, the reflective phase compensation device includes: a plurality of phase adjustment units arranged in an array; each of the phase adjustment units includes: a position adjustment element and a reflector mounted on the position adjustment element; the position adjustment element is used to drive the reflector to move in a direction perpendicular to the reflective surface of the reflector to cause a phase change in the incident light.

[0019] In some embodiments of the present invention, the transmission-type phase compensation device includes: a first substrate and a second substrate arranged opposite to each other, a liquid crystal material located between the first substrate and the second substrate, a plurality of first electrodes located between the first substrate and the liquid crystal material, and a second electrode located between the second substrate and the liquid crystal material; the plurality of first electrodes are arranged in an array, and the liquid crystal material is divided into a plurality of phase adjustment units corresponding to each of the first electrodes; the liquid crystal molecules in the phase adjustment unit are twisted under the drive of the corresponding first electrode and the second electrode to cause the incident light to produce a phase change.

[0020] A second aspect of an embodiment of the present invention provides a display processing method of a projection device, comprising:

[0021] Before displaying an image, controlling the projection device to display a test chart; the test chart includes a three-primary color chart for synthesizing the same test image;

[0022] Taking a picture of the displayed test chart and analyzing the taken image;

[0023] Determine phase compensation data of the three primary colors of light respectively according to the image analysis results;

[0024] generating driving data for driving the phase compensation device according to the determined phase compensation data;

[0025] When displaying an image, the phase compensation device is driven according to the determined driving data so that the three primary color images are focused at the same position.

[0026] In some embodiments of the present invention, before respectively determining the phase compensation data of the three primary colors of light according to the image analysis results, the method further includes:

[0027] The phase compensation device is driven to compensate for the distance between lenses in the projection lens, thereby compensating for the difference in the focusing planes of the three primary color lights.

[0028] In some embodiments of the present invention, the present invention further comprises:

[0029] After the projection device works for a set time, the phase compensation device is driven to calibrate the resolution of the currently displayed image.

[0030] According to a third aspect of an embodiment of the present invention, there is provided a projection system, comprising any one of the above-mentioned projection devices and a projection screen located at a light emitting side of the projection device.

[0031] In the projection device, display processing method and projection system provided by the embodiment of the present invention, the projection device includes: a laser light source device, an illumination system and a projection lens; the illumination system includes a light modulator, which is used to modulate the incident light of the image to be displayed to form a display image. At least one phase compensation device is arranged on the light output side of the light modulator, and the phase compensation device can perform phase compensation on the imaging light, can compensate the distance between the lenses in the projection lens according to the requirements, and can also solve the problem of color separation and resolution degradation caused by temperature drift. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings introduced below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0033] Figure 1 A schematic diagram of the structure of a projection device provided by an embodiment of the present invention;

[0034] Figure 2 One of the structural schematic diagrams of the reflective phase compensation device provided in an embodiment of the present invention;

[0035] Figure 3 A schematic diagram of the structure of a phase adjustment unit provided in an embodiment of the present invention;

[0036] Figure 4 For along Figure 3 Schematic diagram of the cross-sectional structure along the I-I' direction;

[0037] Figure 5 A second structural schematic diagram of a reflective phase compensation device provided in an embodiment of the present invention;

[0038] Figure 6 One of the structural schematic diagrams of the transmission type phase compensation device provided in the embodiment of the present invention;

[0039] Figure 7 A second structural schematic diagram of a transmission type phase compensation device provided in an embodiment of the present invention;

[0040] Figure 8 One of the structural schematic diagrams of the projection lens provided for the implementation of the present invention;

[0041] Fig. 9 A second structural schematic diagram of a projection lens provided for the implementation of the present invention;

[0042] Fig.10 A third structural schematic diagram of a projection lens provided for the implementation of the present invention;

[0043] Fig.11 for Fig.10 Defocus curve of the projection lens for blue light before the phase compensation device is set;

[0044] Fig.12 for Fig.10 The defocus curve of the projection lens for blue light after the phase compensation device is set;

[0045] Fig.13 for Fig.10 The spot diagram of the projection lens for blue light before the phase compensation device is set;

[0046] Fig.14 for Fig.10 The spot diagram of the projection lens for blue light after the phase compensation device is set;

[0047] Fig.15 for Fig.10 Defocus curve of the projection lens for red light before the phase compensation device is set;

[0048] Fig.16 for Fig.10 Defocus curve of the projection lens for red light after the phase compensation device is set;

[0049] Fig.17 for Fig.10 The spot diagram of the projection lens for red light before the phase compensation device is set;

[0050] Fig.18 for Fig.10 The spot diagram of the projection lens for red light after the phase compensation device is set;

[0051] Fig.19 for Fig.10 Defocus curve of the projection lens for green light before the phase compensation device is set;

[0052] Fig. 20 for Fig.10 The defocus curve of the projection lens for green light after the phase compensation device is set;

[0053] Fig.21 for Fig.10 The spot diagram of the projection lens for green light before the phase compensation device is set;

[0054] Fig. 22 for Fig.10 The spot diagram of the projection lens for green light after the phase compensation device is set;

[0055] Fig.23 A fourth structural schematic diagram of a projection lens provided for the implementation of the present invention;

[0056] Fig.24 for Fig.23 Defocus curve of the projection lens for blue light before the phase compensation device is set;

[0057] Fig.25 for Fig.23 The defocus curve of the projection lens for blue light after the phase compensation device is set;

[0058] Fig.26 for Fig.23 The spot diagram of the projection lens for blue light before the phase compensation device is set;

[0059] Fig. 27 for Fig.23 The spot diagram of the projection lens for blue light after the phase compensation device is set;

[0060] Fig.28 for Fig.23 Defocus curve of the projection lens for green light before the phase compensation device is set;

[0061] Fig.29 for Fig.23 The defocus curve of the projection lens for green light after the phase compensation device is set;

[0062] Fig.30 for Fig.23The spot diagram of the projection lens for green light before the phase compensation device is set;

[0063] Fig.31 for Fig.23 The spot diagram of the projection lens for green light after the phase compensation device is set;

[0064] Fig.32 for Fig.23 Defocus curve of the projection lens for red light before the phase compensation device is set;

[0065] Fig.33 for Fig.23 Defocus curve of the projection lens for red light after the phase compensation device is set;

[0066] Fig.34 for Fig.23 The spot diagram of the projection lens for red light before the phase compensation device is set;

[0067] Fig.35 for Fig.23 The spot diagram of the projection lens for red light after the phase compensation device is set;

[0068] Fig.36 A schematic diagram of the structure of a projection system provided by an embodiment of the present invention;

[0069] Fig.37 A flowchart of a display method for a projection device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0070] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described below with reference to the accompanying drawings and examples. However, the exemplary embodiments can be implemented in various forms and should not be understood as being limited to the embodiments described herein; on the contrary, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concepts of the exemplary embodiments to those skilled in the art. The same figure marks in the figures represent the same or similar structures, and thus their repeated descriptions will be omitted. The words expressing position and direction described in the present invention are all explained using the accompanying drawings as examples, but changes can be made as needed, and the changes made are all included in the scope of protection of the present invention. The drawings of the present invention are only used to illustrate the relative position relationship and do not represent the true proportions.

[0071] Laser TV is a display device that uses laser light source as display light source and cooperates with projection display technology for imaging. Traditional display devices need to have a large size to achieve large-size images, while laser TV uses the projection principle and projection lenses for imaging to display large-size images.

[0072] In order to reduce the distance between the projection device and the projection surface and realize large-size image display, an ultra-short-throw projection lens is required. With the increase in usage demand, the requirements for the projection ratio and imaging quality of the projection lens are getting higher and higher. Ultra-short-throw projection lenses usually include a large number of lenses. As the projection ratio decreases, the focal depth of the projected image will be smaller, which will not only make the design scheme complicated, but also increase the difficulty of processing and reduce the yield rate.

[0073] There are inevitably tolerances in the processing and installation of projection lenses, which prevent the projection equipment from imaging according to theoretical values. If the projection equipment is equipped with a laser light source, the refractive index of the lens in the projection lens is different for light of different wavelengths, which will also cause different wavelengths of light to have different focusing positions after passing through the same lens, which is the chromatic aberration problem. The energy of the laser light source is relatively high. Under high-brightness display, the lens in the projection lens changes with temperature, causing the surface shape, thickness, and distance between lenses to change, resulting in changes in the focal plane of the lens, which in turn leads to poor resolution.

[0074] In view of this, an embodiment of the present invention provides a projection device, which can dynamically adjust the resolution of a projection lens to optimize the display effect.

[0075] Figure 1 A schematic diagram of the structure of a projection device provided in an embodiment of the present invention.

[0076] like Figure 1 As shown, the projection device includes: a laser light source device 10, an illumination system 20 and a projection lens 30. The illumination system 20 is located at the light-emitting side of the laser light source device 10, the illumination system 20 includes a light modulator, and the projection lens 30 is located at the light-emitting side of the light modulator.

[0077] The laser light source device 10 can use a monochromatic laser or a laser that can emit lasers of multiple colors or multiple lasers that emit lasers of different colors. When the laser light source device 10 uses a monochromatic laser, the laser display device also needs to be provided with a color wheel, which is used for color conversion. The monochromatic laser cooperates with the color wheel to achieve the emission of primary color lights of different colors in a time sequence. When the laser light source device 10 uses a laser that can emit lasers of multiple colors, it is necessary to control the laser light source to emit lasers of different colors as primary color lights in a time sequence.

[0078] In the embodiment of the present invention, a three-color laser light source device can be used. The three-color laser light source device can be a laser that emits three primary color lasers, such as an MCL laser, etc.; it can also include a red laser, a green laser, and a blue laser that emit three primary color lasers respectively. The use of a three-color laser light source device is conducive to improving the color gamut of the projected image, has better color expression, and can accurately reproduce the input image.

[0079] The laser light source device 10 may also include a light combining component for combining three-color lasers. The light combining component may include a reflector and a dichroic mirror. The number and position of the reflector and the dichroic mirror may be set according to the arrangement rule of the laser chips in the laser to achieve the combination of three-color lasers.

[0080] The lighting system 20 is located on the light-emitting side of the laser light source device 10, and the lighting system 20 includes a light modulator 201. The lighting system 20, on the one hand, shapes and homogenizes the output light beam of the laser light source device 10, and on the other hand, can make the output light of the laser light source device 10 incident on the light modulator 201 at a suitable angle, thereby modulating the incident light to generate a display image. The lighting system 20 may also include a light homogenizing element 202, a plurality of lenses or a lens group 203, so that the illumination light beam is homogenized and shaped before being incident on the light modulator 201. The light homogenizing element 202 may be a light guide or a compound eye lens group, etc., which is not limited here.

[0081] The projection device provided in the embodiment of the present invention may adopt a digital light processing (DLP) system. In a specific implementation, the light modulation device 201 may adopt a digital micromirror (DMD). The surface of the DMD includes many tiny mirrors, each of which can be driven to deflect individually. By controlling the deflection angle of the DMD, the brightness of the reflected light of each tiny mirror is controlled, thereby generating a display image. In addition, the light modulation device 201 may also adopt a liquid crystal on silicon (LCoS) device or a liquid crystal display (LCD). The embodiment of the present invention takes the light modulation device 201 adopting DMD as an example for illustration.

[0082] The projection lens 30 is used to image the output light of the light modulation component 201, so that the audience can watch a display image of a larger size.

[0083] like Figure 1 As shown, the projection device further includes at least one phase compensating device 40, which is located at the light-emitting side of the light modulating device 21 and is used to compensate the phase of the incident light. The phase compensating device 40 can perform phase modulation on the incident light according to the required image display effect, so that the outgoing light produces a set phase difference, thereby modulating the outgoing light wavefront, which can solve the problems of chromatic aberration and temperature drift of the projection lens, so that the image formed by the projection lens 30 has a higher resolution.

[0084] In a specific implementation, one or more phase compensating devices 40 may be provided in the projection device, and the phase compensating device 40 may be a reflective phase compensating device or a transmissive phase compensating device. Each phase compensating device 40 in the projection device may be a reflective phase compensating device or a transmissive phase compensating device, or a reflective phase compensating device and a transmissive phase compensating device may be used in combination.

[0085] The phase compensation device 40 may or may not participate in the imaging. If it participates in the imaging, it can also simplify the design of the projection lens and reduce the number of lenses used.

[0086] Figure 2 This is one of the structural schematic diagrams of the reflective phase compensation device provided in an embodiment of the present invention.

[0087] In some embodiments, Figure 2 As shown, the reflective phase compensation device may include: a plurality of phase adjustment units 400 arranged in an array; each phase adjustment unit 400 includes: a position adjustment element 401 and a reflector 402 mounted on the position adjustment element; the position adjustment element 401 is used to drive the reflector 402 to move in a direction perpendicular to the reflective surface of the reflector to cause a phase change in the incident light.

[0088] Figure 3 A schematic diagram of the structure of a phase adjustment unit provided in an embodiment of the present invention; Figure 4 For along Figure 3 Schematic diagram of the cross-sectional structure along the I-I' direction.

[0089] Specifically, if Figure 3 As shown, the position adjustment element 401 in the phase adjustment unit may include: a first substrate 4011 and a second substrate 4012 arranged opposite to each other, and a driving structure 4013 located between the first substrate 4011 and the second substrate 4012. The reflector 402 may be located on a side of the second substrate 4012 away from the first substrate 4011, and the reflector 402 may be stacked on the second substrate 4012, and the reflective surface of the reflector 402 is located on a side away from the second substrate 4012. The driving structure 4013 is used to drive the second substrate 4012 to move in a direction perpendicular to the second substrate 4012, so as to drive the reflector 402 to move in a direction perpendicular to the reflector 402.

[0090] like Figure 4As shown, the driving structure 4013 may include: at least one first electrode 4013a located on the side of the first substrate 4011 close to the second substrate 4012, a second electrode 4013b located on the side of the second substrate 4012 close to the first substrate 4011, and a plurality of support members 4013c located between the first substrate 4011 and the second substrate 4012, one end of each support member 4013c may be fixedly connected to the first electrode 4013a, and the other end may be fixedly connected to the second electrode 4013b. Among them, the second electrode 4013b may be a plate-shaped electrode, and a fixed potential may be applied to the second electrode 4013b all the time. By applying the same voltage as the second electrode 4013b to at least one first electrode 4013a, or applying a different voltage from the second electrode 4013b, the distance between the first substrate 4011 and the second substrate 4012 may be adjusted, so that the second substrate 4012 may drive the reflector 402 to adjust its position.

[0091] In some embodiments, when a voltage different from that of the second electrode 4013b is loaded on the first electrode 4013a, a voltage difference is formed between the first electrode 4013a and the second electrode 4013b, so that an electric adsorption force is generated between the first substrate 4011 and the second substrate 4012. Under the action of the electric adsorption force, the second substrate 4012 can be driven to move in a direction perpendicular to the second substrate 4012 to adjust the distance between the first substrate 4011 and the second substrate 4012.

[0092] During the movement of the second substrate 4012 in a direction perpendicular to the second substrate 4012, the plurality of support members 4013c located between the first substrate 4011 and the second substrate 4012 need to be stretched or contracted. The magnitude of the electric adsorption force generated between the first substrate 4011 and the second substrate 4012 is related to the area of ​​the first electrode 4013a. Therefore, by arranging a plurality of first electrodes 4013a on the side of the first substrate 4011 close to the second substrate 4012, it is possible to control the generation of a variety of positional relationships between the first substrate 4011 and the second substrate 4012, so that the reflector 402 on the side of the second substrate 4012 away from the first substrate 4011 can be located at a variety of different positions, thereby effectively improving the modulation accuracy of the phase compensation device 40.

[0093] When the position of the reflector 402 on the position adjustment element 401 changes, the incident light will be incident on the reflector 402 at different positions, and then there will be a difference in the optical path between the reflected light, so that a phase difference is generated between the reflected light, thereby achieving phase modulation of the incident light.

[0094] Figure 5 The second structural schematic diagram of the reflective phase compensation device provided in an embodiment of the present invention.

[0095] In some embodiments, Figure 5 As shown, the reflective phase compensation device may include: a first substrate 4011 and a second substrate 4012 arranged opposite to each other, a liquid crystal material 4014 located between the first substrate 4011 and the second substrate 4012, a plurality of first electrodes 4013a located between the first substrate 4011 and the liquid crystal material 4014, and a second electrode 4013b located between the second substrate 4012 and the liquid crystal material 4014.

[0096] The first electrodes 4013a are arranged in an array, the second electrodes 4013b can be plate-shaped electrodes, and the second electrodes 4013b can always apply a fixed potential. The liquid crystal material 4014 is divided into a plurality of phase adjustment units 400 corresponding to the first electrodes 4013a. By applying the same voltage as the second electrode 4013b, or applying a different voltage from the second electrode 4013b to at least one first electrode 4013a, the degree of twisting of the liquid crystal molecules between the first electrode and the second electrode can be adjusted. Since the liquid crystal molecules have the property of birefringence, the light incident into the liquid crystal material is decomposed into ordinary light and extraordinary light, and the ordinary light and extraordinary light have different refractive indices in the liquid crystal molecules. Then, after passing through the liquid crystal molecules twisted to different degrees, different phase differences are generated between the ordinary light and the extraordinary light, thereby achieving phase modulation of the incident light.

[0097] like Figure 5 As shown, in some embodiments, each first electrode 4013a can be a reflective electrode, and the second electrode 4013b is a transparent electrode. Light is incident on the reflective phase compensation device 40 on one side of the second substrate 4012, is reflected by the first electrode 4013a, and then emitted from the second substrate 4012.

[0098] In some embodiments, each first electrode 4013a and the second electrode 4013b can be a transparent electrode, and a reflective layer can be set between the first electrode 4013a and the first substrate 4011, or a reflective layer can be set on the side of the first substrate 4011 away from the first electrode 4013a, both of which can achieve reflection of incident light.

[0099] In some embodiments, the reflective phase compensation device 40 may also use silicon-based liquid crystal, and the driving element of the silicon-based liquid crystal is a reflective element, so it can also reflect the incident light.

[0100] Figure 6 This is one of the structural schematic diagrams of the transmission type phase compensation device provided in an embodiment of the present invention.

[0101] In some embodiments, Figure 6As shown, the transmissive phase compensation device may include: a first substrate 4011 and a second substrate 4012 arranged opposite to each other, a liquid crystal material 4014 located between the first substrate 4011 and the second substrate 4012, a plurality of first electrodes 4013a located between the first substrate 4011 and the liquid crystal material 4014, and a second electrode 4013b located between the second substrate 4012 and the liquid crystal material 4014.

[0102] The first electrodes 4013a are arranged in an array, the second electrodes 4013b can be plate-shaped electrodes, and the second electrodes 4013b can always apply a fixed potential. The liquid crystal material 4014 is divided into a plurality of phase adjustment units 400 corresponding to the first electrodes 4013a. By applying the same voltage as the second electrode 4013b, or applying a different voltage from the second electrode 4013b to at least one first electrode 4013a, the degree of twisting of the liquid crystal molecules between the first electrode and the second electrode can be adjusted. Since the liquid crystal molecules have the property of birefringence, the light incident into the liquid crystal material is decomposed into ordinary light and extraordinary light, and the ordinary light and extraordinary light have different refractive indices in the liquid crystal molecules. Then, after passing through the liquid crystal molecules twisted to different degrees, different phase differences are generated between the ordinary light and the extraordinary light, thereby achieving phase modulation of the incident light.

[0103] like Figure 6 As shown, each of the first electrode 4013a and the second electrode 4013b is a transparent electrode, and light is incident on the reflective phase compensation device 40 on the side of the first substrate 4011, and then emitted from the second substrate 4012 after being phase modulated by the liquid crystal material.

[0104] Figure 7 The second structural schematic diagram of the transmission type phase compensation device provided in the embodiment of the present invention.

[0105] In some embodiments, Figure 7 As shown, the transmission type phase compensation device may include: a plurality of phase adjustment units 400 arranged in an array; each phase adjustment unit 400 includes: a position adjustment element 401 and a light-transmitting mirror 403 mounted on the position adjustment element; the position adjustment element 401 is used to drive the light-transmitting mirror 403 to move in a direction perpendicular to the light-transmitting mirror.

[0106] In a specific implementation, each position adjustment element 401 can be driven individually to adjust the position of the light-transmitting mirror 403. After the position of each light-transmitting mirror 403 is determined, all the light-transmitting mirrors 403 can be regarded as a lens with a specific surface shape. Then, the light can produce a phase change after entering the lens, thereby realizing phase modulation of the incident light.

[0107] The specific structure of the position adjustment element 401 can refer to the position adjustment element in the reflective phase compensation device. It is worth noting that, considering that the transmissive phase compensation device needs to allow the incident light to pass through, in order to ensure the transmittance of the light, the phase adjustment element 401 needs to be as small as possible to avoid the position adjustment element 401 blocking the incident light. In addition, the light-transmitting mirror 403 can be a flat lens, and the material can be glass or plastic, which is not limited here.

[0108] In specific implementation, a reflective phase compensation device or a transmissive phase compensation device can be selected according to the design structure of the projection device. Among them, the reflective phase compensation device not only has the function of phase compensation, but also can bend the light to achieve the effect of folding the light path, which is conducive to the miniaturization design of the projection device.

[0109] The projection device provided by the embodiment of the present invention can be applied to laser televisions. Laser televisions need to be equipped with ultra-short-focus projection lenses, so as to reduce the projection ratio of the lens and achieve larger-size image display at a smaller projection distance.

[0110] Figure 8 One of the structural schematic diagrams of the projection lens provided for the implementation of the present invention.

[0111] In some embodiments, Figure 8 As shown, the ultra-short-focus projection lens includes: a refraction system s1 and a reflection system s2; wherein the refraction system s1 includes: a rear mirror group 301, a middle mirror group 302 and a front mirror group 303 arranged in sequence along a direction gradually away from the light modulation device 201; the reflection system s2 is located on the side of the front mirror group 303 away from the middle mirror group 302, and the reflection system s2 includes a curved reflector 304.

[0112] The projection lens is a secondary imaging structure. After the outgoing light beam of the light modulator 201 passes through the refraction system s1, it is imaged for the first time between the reflection system s2 and the refraction system s1. After the first image is reflected by the curved reflector 304, it is imaged for the second time on the projection surface.

[0113] A total reflection prism 204 can also be arranged before the optical path of the light modulator 201, and the total reflection prism 204 can separate the illumination light beam and the projection light beam. After the homogenized light beam is incident on the total reflection prism 204, it will be totally reflected by the total reflection prism 204 toward the light modulator 204, and after the light modulator 204 modulates the incident light beam, it will be incident on the total reflection prism 204 again, and will be transmitted to the projection lens by the total reflection prism 204.

[0114] like Figure 8As shown, the projection device further includes an image shifting lens group 205, which is located between the light modulating device 201 and the projection lens 30. The image shifting lens group 205 may include a flat glass, which may vibrate at a high frequency, and the vibration direction may generally be along the diagonal direction of the projected image, thereby improving the resolution of the projected image without changing the physical resolution of the projection system.

[0115] By rationally optimizing the number, size, and surface shape of the lenses in the projection lens, the projection ratio of the projection lens can be reduced, thereby further reducing the projection distance when projecting a picture of the same size. Among them, the rear lens group 301, the middle lens group 302, and the front lens group 303 can all include multiple lenses. According to design requirements, at least one of the lenses in the projection lens can have a non-spherical lens surface shape to improve aberrations such as field curvature and astigmatism. Double-cemented or triple-cemented lens groups can also be used in the projection lens to correct chromatic aberration. The curved reflector 304 can be a concave non-spherical reflector or a free-form reflector. The embodiment of the present invention does not limit the number, surface shape, and combination form of the lenses in the projection lens. In order to achieve a smaller projection ratio, the projection lens can be designed according to actual needs.

[0116] For example, the parameters such as the surface shape, material, and spacing of each optical element in the projection lens provided by the embodiment of the present invention are shown in the following table:

[0117] Serial number Radius of curvature thickness Material Quadratic curve coefficient 1 -398 2 39.2 32.6 Mirror -3.951 3 -45 Mirror 4 33.5 -3.5 480R -0.87 5 -41.1 -3 -16.02 6 144.5 -3.5 S-NPH3 7 -127.5 -2.4 8 -6348.1 -10.52 S-BAL42 9 35.24 -12.24 10 -552.3 -6.81 S-TIH23 11 55.6 -11.93 12 -261.6 -3.23 S-FTM16 13 16.9 -1.82 S-LAH58 14 -12.6 -0.51 15 -11.2 -5.33 H-ZF11 16 -622.3 -0.44 17 -17.3 -2.51 S-NPH1 18 -414.8 -2.09 19 32.42 -4.5 H-FK61 20 7.14 -1.5 H-LAF75B 21 -19.62 -5.21 S-FPM3 22 14.61 -0.19 23 -362.19 -7.2 N-BK7 24 14.6 -0.19 -0.256 25 3562.8 -7.38 H-K2 26 19.89 -3.5

[0118] The coefficients for aspherical surfaces are as follows:

[0119] Serial number <![CDATA[4 th ]]> <![CDATA[6 th ]]> <![CDATA[8 th ]]> <![CDATA[10 th ]]> <![CDATA[12 th ]]> <![CDATA[14 th ]]> <![CDATA[16 th ]]> <![CDATA[18 th ]]> 2 4.681-6 -2.167E-9 5.301E-13 3.408E-16 -3.6E-19 1.425E-22 -2.705E-26 2.024E-30 4 -2.598E-5 6.492E-8 -7.592E-11 2.927E-14 1.399E-16 -3.153E-19 2.503E-22 5 -1.085E7 6.525E-8 1.474E-10 9.588E14 1.456E-16 -2.719E-19 1.287E-22 23 6.3E-5 8.075E-8 -2.98E-9 4.922E-11 -3.259E-13 6.047E-16 24 -5.787E-6 1.275E-7 -8.277E-10 1.18E-11 4.909E-14 1.965E-16

[0120] The serial numbers of the above optical surfaces are listed in the order from the projection surface to the curved reflector 304, the front mirror group 303, the middle mirror group 302, and the rear mirror group 301, and the above table mainly lists the parameters such as the curvature radius, thickness, material and quadratic curve coefficient of the curved optical surface.

[0121] The lens architecture is mostly a grouping and combination architecture of static optical lenses, and various indicators of the lens are achieved by combining optical materials and surface shapes. In the case of ultra-short focus with extremely low projection ratio, not only is the design complicated, but it is also difficult to solve the resolution and chromatic aberration problems at different temperatures, resulting in difficulties in practical application. The embodiment of the present invention adds a phase compensation device to the projection lens, and the phase compensation device can participate in imaging, thereby reducing the number of lenses in the projection lens and simplifying the projection lens design; without changing the architecture of the projection lens, adding a phase compensation device to the projection lens can also correct the chromatic aberration, resolution, etc. of the projection lens to improve the imaging quality.

[0122] Specifically, for the projection lens of the four-group lens group structure provided in the embodiment of the present invention, the phase compensation device 40 can be located in various positions in the projection lens. In some embodiments, the phase compensation device 40 can be located between the rear lens group 301 and the middle lens group 302; in some embodiments, the phase compensation device 40 can be located between the middle lens group 302 and the front lens group 303; in some embodiments, the phase compensation device 40 can be located between the front lens group 303 and the reflection system (curved reflector 304); in some embodiments, when the distance between the lenses on both sides of the aperture in the rear lens group is large and most of the lenses are concentrated on one side, the phase compensation device 40 can also be set between two adjacent lenses in the rear lens group; in some embodiments, the phase compensation device 40 can also be set between the light modulator 201 and the rear lens group 301. The phase compensation device 40 can be one or more and can be set in any of the above positions, and the phase compensation device 40 can be a reflective phase compensation device or a transmissive phase compensation device, which is not limited here.

[0123] The following embodiments of the present invention illustrate some arrangement positions of the phase compensation device. Fig. 9 A second structural schematic diagram of a projection lens provided for the implementation of the present invention; Fig.10 The third structural schematic diagram of the projection lens provided for the implementation of the present invention.

[0124] In some embodiments, Fig. 9 As shown, the phase compensating device 40 can be a transmission type phase compensating device, and the phase compensating device 40 is located between the rear mirror group 301 and the middle mirror group 302. When the projection lens is optically designed, the rear mirror group 301, the middle mirror group 302, and the front mirror group 303 have different functions. The rear mirror group 301 is mainly used to compress light, correct spherical aberration, coma and chromatic aberration, etc., while the middle mirror group 302 and the front mirror group 301 are mainly used to correct distortion and chromatic aberration, and there is usually a large distance between the rear mirror group 301 and the middle mirror group 302. The phase compensating device 40 is arranged between the rear mirror group 301 and the middle mirror group 302 to better meet the spatial design of the projection lens, and has a role of connecting the past and the future. The compensation of the phase by the phase compensating device 40 can be calculated according to the output waveform, thereby changing the analytical state. In addition, the phase compensating device 40 can also have the function of a focusing lens according to the algorithm, thereby improving the imaging distance.

[0125] In addition, the transmissive phase compensator can also be arranged between the light modulator 201 and the rear mirror group 301. It is worth noting that the transmissive phase compensator usually contains liquid crystal, and the projection device has a higher energy when using a laser light source, so the position of the transmissive phase compensator needs to be set considering the tolerance of the liquid crystal.

[0126] In some embodiments, Fig.10 As shown, the phase compensating device 40 may be a reflective phase compensating device, and the phase compensating device 40 is located between the rear lens group 301 and the middle lens group 302. As described above, there is usually a large distance between the rear lens group 301 and the middle lens group 302, which is convenient for arranging the phase compensating device, and arranging the phase compensating device at this position has a function of connecting the past and the future in terms of function.

[0127] The embodiment of the present invention also simulates the effect of the phase compensation device on improving the resolution of the projection lens. Fig.11 and Fig.12 This is the defocus curve of blue light before and after the phase compensation device is set. Fig.13 and Fig.14 The point diagram of blue light before and after the phase compensation device is set; Fig.15 and Fig.16 This is the defocus curve of red light before and after the phase compensation device is set. Fig.17 and Fig.18 This is the spot diagram of red light before and after the phase compensation device is set; Fig.19 and Fig. 20 This is the defocus curve of green light before and after the phase compensation device is set. Fig.21 and Fig. 22 The point diagram of green light before and after the phase compensation device is set. The horizontal axis of the defocus curve represents the focal shift (defocus position), in mm, and the vertical axis represents the MTF value. Each curve represents the MTF curve in different fields of view. The point diagram can reflect the clarity of the projection lens imaging. The more concentrated the points in the diagram, the less smear and better sharpness the projection lens has when imaging.

[0128] contrast Fig.11 and Fig.12 It can be seen that after the phase compensation device 40 is arranged in the projection lens, the MTF value of the blue light with a wavelength of 450 nm at the optical axis increases and has a larger focal depth.

[0129] The root mean square (RNS) radius and geometric (GEO) radius data of the images of the nine fields of view simulated by the blue light with a wavelength of 450nm before the phase compensation device is set are shown in the following table:

[0130] Field of view 1 2 3 4 5 6 7 8 9 RNS radius (μm) 1.161 2.666 2.458 1.518 1.407 1.944 2.158 1.670 0.899 GEO radius (μm) 2.138 4.624 4.088 2.931 3.790 4.704 5.247 3.951 2.408

[0131] The root mean square (RNS) radius and geometric (GEO) radius data of the image formed after the phase compensation device is set are shown in the following table:

[0132] Field of view 1 2 3 4 5 6 7 8 9 RNS radius (μm) 1.115 1.792 1.650 0.905 1.228 1.935 1.835 1.229 1.190 GEO radius (μm) 2.656 4.290 3.945 2.348 2.723 4.035 4.871 3.354 2.928

[0133] Compare the above two tables and Fig.13 and Fig.14 It can be seen that after the phase compensation device is set in the projection lens, the root mean square radius and geometric radius of the blue light imaging are reduced, indicating that the imaging quality is improved.

[0134] contrast Fig.15 and Fig.16 It can be seen that after the phase compensation device 40 is arranged in the projection lens, the MTF value of the red light with a wavelength of 640 nm at the optical axis increases and has a larger focal depth.

[0135] The root mean square (RNS) radius and geometric (GEO) radius data of the images of the nine fields of view simulated by the red light with a wavelength of 640nm before the phase compensation device is set are shown in the following table:

[0136] Field of view 1 2 3 4 5 6 7 8 9 RNS radius (μm) 1.582 2.516 2.692 2.001 1.265 1.676 1.727 1.879 2.383 GEO radius (μm) 3.492 5.813 6.197 4.777 2.816 5.215 3.802 4.479 6.896

[0137] The root mean square (RNS) radius and geometric (GEO) radius data of the image formed after the phase compensation device is set are shown in the following table:

[0138] Field of view 1 2 3 4 5 6 7 8 9 RNS radius (μm) 1.439 1.677 1.955 1.495 1.054 1.929 1.603 1.524 1.558 GEO radius (μm) 2.512 4.576 5.205 4.114 2.397 7.440 4.362 3.356 5.728

[0139] Compare the above two tables and Fig.17 and Fig.18 It can be seen that after the phase compensation device is set in the projection lens, the root mean square radius and geometric radius of the imaging of the red light are reduced, indicating that the imaging quality is improved.

[0140] contrast Fig.19 and Fig. 20 It can be seen that after the phase compensation device 40 is arranged in the projection lens, the MTF value of the green light with a wavelength of 550 nm at the optical axis increases and has a larger focal depth.

[0141] The root mean square (RNS) radius and geometric (GEO) radius data of the images of the nine fields of view simulated by the green light with a wavelength of 550nm before the phase compensation device is set are shown in the following table:

[0142] Field of view 1 2 3 4 5 6 7 8 9 RNS radius (μm) 2.101 2.143 1.935 1.274 1.334 1.998 1.986 1.404 1.604 GEO radius (μm) 4.279 4.358 4.090 2.832 3.515 5.874 3.876 3.391 5.128

[0143] The root mean square (RNS) radius and geometric (GEO) radius data of the image formed after the phase compensation device is set are shown in the following table:

[0144] Field of view 1 2 3 4 5 6 7 8 9 RNS radius (μm) 1.259 1.538 1.627 1.091 1.007 1.732 1.558 1.200 1.738 GEO radius (μm) 1.967 4.184 4.486 3.280 1.909 4.670 3.070 3.362 5.295

[0145] Compare the above two tables and Fig.21 and Fig. 22It can be seen that after the phase compensation device is set in the projection lens, the root mean square radius and geometric radius of the imaging of the green light are reduced, indicating that the imaging quality is improved.

[0146] It can be seen that after adding a phase compensation device between the rear group lens and the middle group lens of the projection lens, the three primary colors of light can be phase compensated separately to achieve adjustment of resolution, chromatic aberration and temperature drift, thereby improving the imaging resolution of the three primary colors of light.

[0147] Fig.23 The fourth structural schematic diagram of the projection lens provided for the implementation of the present invention.

[0148] In some embodiments, Fig.23 As shown, the phase compensating device 40 can adopt a reflective phase compensating device, and the phase compensating device 40 is located between the front group lens group 303 and the curved reflector 304. For this position, since the distance to the projection surface is closer, the correction algorithm is relatively simple when correcting the resolution, chromatic aberration and temperature drift of the lens. And due to the effect of folding light of the phase compensating device, the structure of the projection lens can adopt a vertical structure, that is, a structure with a height greater than the width, and the height direction can be parallel to the projection surface, thereby saving the space required for the projection device. In practical applications, it is also possible to add structures such as reflectors to fold the light according to the structure required by the projection device, so that the projection device has a suitable size and volume.

[0149] The embodiment of the present invention also simulates the effect of the phase compensation device on improving the resolution of the projection lens. Fig.24 and Fig.25 This is the defocus curve of blue light before and after the phase compensation device is set. Fig.26 and Fig. 27 The point diagram of blue light before and after the phase compensation device is set; Fig.28 and Fig.29 This is the defocus curve of green light before and after the phase compensation device is set. Fig.30 and Fig.31 This is the spot diagram of green light before and after the phase compensation device is set; Fig.32 and Fig.33 This is the defocus curve of red light before and after the phase compensation device is set. Fig.34 and Fig.35 This is the spot diagram of red light before and after setting the phase compensation device.

[0150] contrast Fig.24 and Fig.25 It can be seen that after the phase compensation device 40 is arranged in the projection lens, the MTF value of the blue light with a wavelength of 455 nm at the optical axis increases and has a larger focal depth.

[0151] The root mean square (RNS) radius and geometric (GEO) radius data of the images of the ten fields of view simulated by the blue light with a wavelength of 455nm before the phase compensation device is set are shown in the following table:

[0152]

[0153] The root mean square (RNS) radius and geometric (GEO) radius data of the image formed after the phase compensation device is set are shown in the following table:

[0154]

[0155] Compare the above two tables and Fig.26 and Fig. 27 It can be seen that after the phase compensation device is set in the projection lens, the root mean square radius and geometric radius of the blue light imaging are reduced, indicating that the imaging quality is improved.

[0156] contrast Fig.28 and Fig.29 It can be seen that after the phase compensation device 40 is arranged in the projection lens, the MTF value of the green light with a wavelength of 550 nm at the optical axis increases and has a larger focal depth.

[0157] The root mean square (RNS) radius and geometric (GEO) radius data of the images of the ten fields of view simulated by the green light with a wavelength of 550nm before the phase compensation device is set are shown in the following table:

[0158]

[0159] The root mean square (RNS) radius and geometric (GEO) radius data of the image formed after the phase compensation device is set are shown in the following table:

[0160]

[0161] Compare the above two tables and Fig.30 and Fig.31 It can be seen that after the phase compensation device is set in the projection lens, the root mean square radius and geometric radius of the imaging of the green light are reduced, indicating that the imaging quality is improved.

[0162] contrast Fig.32 and Fig.33 It can be seen that after the phase compensation device 40 is arranged in the projection lens, the MTF value of the red light with a wavelength of 620 nm at the optical axis increases and has a larger focal depth.

[0163] The root mean square (RNS) radius and geometric (GEO) radius data of the images of the ten fields of view simulated by the red light with a wavelength of 620nm before the phase compensation device is set are shown in the following table:

[0164]

[0165] The root mean square (RNS) radius and geometric (GEO) radius data of the image formed after the phase compensation device is set are shown in the following table:

[0166]

[0167] Compare the above two tables and Fig.34 and Fig.35 It can be seen that after the phase compensation device is set in the projection lens, the root mean square radius and geometric radius of the imaging of the red light are reduced, indicating that the imaging quality is improved.

[0168] It can be seen that after adding a phase compensation device between the front group of lenses and the curved reflector of the projection lens, the three primary colors of light can be phase compensated separately to achieve adjustment of resolution, chromatic aberration and temperature drift, thereby improving the imaging resolution of the three primary colors of light.

[0169] The reflective phase compensator not only has the function of phase compensation, but also can fold light. Because the length of the ultra-short-throw projection lens is longer than that of the conventional ultra-short-throw projection lens, and is limited by the low projection ratio and the size of the whole machine, adding a reflective phase compensator to the projection lens can fold the light and compress the lens length. At the same time, the reflective phase compensator is different from the conventional plane reflector and also has the function of phase compensation, which can dynamically adjust the wavefront.

[0170] Based on the same inventive concept, an embodiment of the present invention further provides a projection system. Fig.36 A schematic diagram of the structure of a projection system provided by an embodiment of the present invention.

[0171] like Fig.36 As shown, the projection system includes: a projection device 1 and a projection screen 2. The projection screen 2 is located at the light-emitting side of the projection device 1, and the audience faces the projection screen 2. The projection device 1 emits projection light, and the projection light is incident on the projection screen 2, and is reflected toward the position of the audience through the projection screen 2, so that the audience can watch the projected image.

[0172] Among them, the ultra-short-throw projection device has the characteristics of short projection distance and large projection screen, and is very suitable for application in the home field. The projection system provided by the embodiment of the present invention can use the ultra-short-throw projection device. The ultra-short-throw projection device is provided with at least one phase compensation device, which can adjust the wavefront of the imaging light, thereby solving the problem of color separation and resolution degradation caused by temperature drift.

[0173] The embodiment of the present invention further provides a display method of a projection device. Fig.37 A flowchart of a display method for a projection device provided by an embodiment of the present invention.

[0174] like Fig.37 As shown, the display method of the projection device includes:

[0175] S10, before displaying an image, controlling the projection device to display a test chart; the test chart includes a three-primary color chart for synthesizing the same test image;

[0176] S20, photographing the displayed test chart, and analyzing the photographed image;

[0177] S30, determining phase compensation data of the three primary colors of light respectively according to the image analysis result;

[0178] S40, generating driving data for driving the phase compensation device according to the determined phase compensation data;

[0179] S50 . When displaying an image, drive the phase compensation device according to the determined driving data to focus the three primary color images at the same position.

[0180] The projection device provided in the embodiment of the present invention is provided with at least one phase compensation device. In addition, the projection device may further include a controller, which may be an external processing device or a driving chip for driving the projection device to display images. The projection device may also be connected to a camera, which may be built in the projection device or may be a camera connected externally to the projection device. The controller is connected to the phase compensation device and the camera. The phase compensation device includes a plurality of phase adjustment units, each of which may be driven individually by the controller. The camera may also perform a shooting operation under the drive of the controller. The controller may pre-solidify the algorithm program, and before displaying the image, the projection device is first controlled to display a test chart on the projection surface, the controller drives the camera to shoot the test chart, receives the image shot by the camera, and analyzes the image. The image displayed by the projection device sequentially displays the three-primary color image in a time sequence, the switching frequency of the three-primary color image exceeds the recognizable frequency of the human eye, and the retention effect of the human eye is used to synthesize the color image. Then the test chart displayed on the projection surface includes the three-primary color chart, and the camera may sequentially shoot the three-primary color chart. The controller can determine the phase compensation data of each primary color light based on the wavefront according to the preset algorithm based on the image analysis result, and thus determine the driving data for driving the phase compensation device according to the phase compensation data, and the driving data can include the driving voltage of each phase adjustment unit. Then, when displaying the image, the phase compensation device can be driven in time-sharing according to the determined driving data to adjust the wavefront of the three primary colors of light, so that the three primary color images are focused on the same position of the projection surface, thereby solving the problems of chromatic aberration and resolution reduction of the projection lens.

[0181] The above adjustment process can be set as a closed-loop control program, that is, when the image is displayed, the phase compensation device is driven to perform phase compensation, and at the same time, the displayed image continues to be photographed, and the steps of image analysis, determining driving data, and driving the phase compensation device according to the driving data are repeated until the image resolution reaches the set standard and then the program is exited.

[0182] The phase compensation device can also compensate for the lens spacing in the projection lens. When the phase compensation device is a reflective phase compensation device, taking a reflector device as an example, the reflectors of each phase adjustment unit are located at the same position in the initial state, and the reflection surface formed by each reflector is located in the same plane. When compensating the lens spacing in the projection lens, each reflector can be driven to move the same displacement at the same time, so that the optical path of the reflected light changes as a whole, thereby achieving the purpose of compensating the lens spacing. Among them, the lens spacing change is twice the distance the reflector moves. When the phase compensation device is a transmissive phase compensation device, taking a liquid crystal device as an example, when the liquid crystal materials in each phase adjustment unit are twisted to the same state, then each phase adjustment unit can produce the same phase difference, thereby changing the optical path between the lenses, which is equivalent to changing the spacing between the lenses. By setting a phase compensation device in the projection lens, the components and installation errors of the projection lens can be compensated, and the resolution can be improved. It is precisely because of the spacing compensation effect of the phase compensation device that the processing difficulty of each component in the projection lens can be reduced, and the cost can be reduced.

[0183] The projection lens cannot be completely free of chromatic aberration during the design optimization process. By setting a phase compensation device in the projection lens, the position of the reflector of the phase adjustment unit can be driven according to the degree of chromatic aberration to achieve the desired compensation surface shape, thereby correcting the chromatic aberration.

[0184] To adjust the resolution of primary lights of different colors, the position of the reflector in the phase adjustment unit can be adjusted in time-sharing according to the display timing of the three primary lights to compensate for the resolution of the primary lights of different colors, so that the focal plane of the three primary lights image is balanced and the resolution is optimal.

[0185] The resolution of the displayed image decreases due to changes in the thickness and surface shape of the lens in the projection lens under long-term high-energy laser irradiation, which is the inevitable temperature drift problem of the projection lens. The phase compensation device can also be driven to calibrate the resolution of the current displayed image after the projection device has worked for a set time.

[0186] Specifically, the phase adjustment program can be started at a set time per interval to correct the resolution. Alternatively, different driving data can be pre-determined to drive the phase compensation device according to the housing and lens of the projection device at different temperatures to adjust the lens resolution according to the temperature.

[0187] The above display control method provided by the embodiment of the present invention uses an automatic control program to drive the phase compensation device to adjust the wavefront according to different scenes. In addition, the driving data of the phase compensation device can also be determined according to empirical values, and the best analysis effect can be achieved by fine-tuning the data one by one. Then, according to different application scenarios, the driving data can be pre-stored in the memory of the projection device, and the data can be directly retrieved to drive the phase compensation device when switching to different application scenarios.

[0188] Specifically, first determine the initial position of the phase compensation device. Depending on different design schemes, the phase compensation device may or may not participate in imaging. Then determine the initial phase of each phase adjustment unit in the phase compensation device, apply the same initial drive signal to each phase adjustment unit, compensate for the lens spacing, and optimize the resolution. If the optimal resolution state is reached, determine the initial drive signal; if the optimal resolution state is not reached, fine-tune the drive signal until the optimal resolution state is reached, and use the drive signal that reaches the optimal resolution state as the initial drive signal of each phase adjustment unit. Before displaying the image, first confirm the resolution state of the three primary colors. For those with obvious poor resolution, input the simulated drive data into the phase compensation device, and verify whether the resolution state meets the standard. If the optimal resolution is not reached, fine-tune the data until the resolution state meets the standard, store the drive data at this time as the drive data of the phase compensation device of the primary color light of the corresponding color, and when displaying the image, drive the phase compensation device to adjust the wavefront in accordance with the three primary color image data. After the projection device has been working for a period of time, it is easy to cause resolution changes. At this time, the simulated drive data can be input into the phase compensation device, and verify whether the resolution state meets the standard. If the best resolution is not achieved, the data is fine-tuned until the resolution meets the standard, and the driving data at this time is stored as the driving data of the phase compensation device in this period. In different time periods of image display, different driving data are imported to drive the phase compensation device for real-time adjustment.

[0189] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0190] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A projection device, characterized in that: include: A laser light source device, used for emitting an illumination light beam; An illumination system, located at the light-emitting side of the laser light source device, for shaping and modulating the incident light; The illumination system includes a light modulation device for modulating incident light according to an image to be displayed to form a display image; A projection lens, located at the light-emitting side of the light modulation device, for imaging the formed display image; At least one phase compensation device is located at the light output side of the optical modulation device and is used to compensate the phase of the incident light.

2. The projection device according to claim 1, characterized in that: The projection lens is an ultra-short-throw projection lens, and the ultra-short-throw projection lens includes: a refraction system and a reflection system; The refraction system comprises: a rear mirror group, a middle mirror group and a front mirror group arranged in sequence in a direction gradually away from the light modulation device; the reflection system is located on a side of the front mirror group away from the middle mirror group; The phase compensation device is located in the projection lens, or between the light modulation device and the projection lens.

3. The projection device according to claim 2, characterized in that: The phase compensation device is located between the rear mirror group and the middle mirror group; Alternatively, the phase compensation device is located between the middle group lens group and the front group lens group; Alternatively, the phase compensation device is located between the front group of mirrors and the reflection system; Alternatively, the phase compensation device is located between two adjacent lenses in the rear lens group; Alternatively, the phase compensation device is located between the light modulation device and the rear mirror group.

4. The projection device according to claim 3, characterized in that: Each phase compensation device in the projection device is a reflective phase compensation device and / or a transmissive phase compensation device.

5. The projection device according to claim 4, characterized in that: The reflective phase compensation device includes: a plurality of phase adjustment units arranged in an array; each of the phase adjustment units includes: a position adjustment element and a reflector mounted on the position adjustment element; the position adjustment element is used to drive the reflector to move in a direction perpendicular to the reflective surface of the reflector to cause a phase change in the incident light.

6. The projection device according to claim 4, characterized in that: The transmission type phase compensation device comprises: a first substrate and a second substrate arranged opposite to each other, a liquid crystal material located between the first substrate and the second substrate, a plurality of first electrodes located between the first substrate and the liquid crystal material, and a second electrode located between the second substrate and the liquid crystal material; the plurality of first electrodes are arranged in an array, and the liquid crystal material is divided into a plurality of phase adjustment units corresponding to each of the first electrodes; the liquid crystal molecules in the phase adjustment unit are twisted under the driving of the corresponding first electrode and the second electrode to cause the incident light to produce a phase change.

7. A display processing method for a projection device, characterized in that: include: Before displaying an image, controlling the projection device to display a test chart; the test chart includes a three-primary color chart for synthesizing the same test image; Taking a picture of the displayed test chart and analyzing the taken image; Determine phase compensation data of the three primary colors of light respectively according to the image analysis results; generating driving data for driving the phase compensation device according to the determined phase compensation data; When displaying an image, the phase compensation device is driven according to the determined driving data so that the three primary color images are focused at the same position.

8. The display processing method according to claim 7, characterized in that: Before respectively determining the phase compensation data of the three primary colors of light according to the image analysis results, it also includes: The phase compensation device is driven to compensate for the distance between lenses in the projection lens, thereby compensating for the difference in the focusing planes of the three primary color lights.

9. The display processing method according to claim 7, characterized in that: Also includes: After the projection device works for a set time, the phase compensation device is driven to calibrate the resolution of the currently displayed image.

10. A projection system, characterized in that: include: The projection device according to any one of claims 1 to 6 and a projection screen located on the light emitting side of the projection device.

Images