Optical engine system and projection system

Abstract

An embodiment of the present application provides an optical engine system, including a light combining element and a modulator, wherein the modulator is used to receive and modulate a first light beam to emit a first modulated light, and is also used to receive and modulate a second light beam to emit a second modulated light. The first modulated light and the second modulated light are the same frame image, and each first pixel in the first modulated light and the second pixel corresponding to the first pixel in the second modulated light are offset by a preset displacement value on the projection surface. The light combining element combines the first modulated light and the second modulated light and emits them. When the first modulated light and the second modulated light are superimposed on each other, the purpose of expanding the pixel resolution is achieved, thereby realizing high-resolution image display. At the same time, an embodiment of the present application also provides a projection system.

Description

Technical Field

[0001] The present application relates to the field of projection technology, and in particular to an optical engine system and a projection system. Background Art

[0002] Projection technology, particularly systems based on spatial light modulators (SLMs), is limited in pixel resolution by the intrinsic pixel count of the SLM. Extended pixel resolution (XPR) technology can improve resolution. The basic principle is as follows: a reciprocating optical element is implanted in the optical path to deflect the principal light beam, creating a repeated half-pixel offset. This is combined with time-division image splitting and sequential output of the DMD images before and after the offset. Higher resolution is achieved through image superposition. To achieve this deflection, the reciprocating optical element can be implemented using solutions including, but not limited to, voice coil motors and piezoelectric ceramics. However, the rotational inertia of such reciprocating components increases the driving force and control difficulty as their size increases. Furthermore, achieving high-resolution image superposition from low resolution generally requires steady-state operation. Therefore, the dynamic characteristics of the moving components increase control complexity and impose relatively stringent requirements on the device's operating environment. This approach enables a low-resolution SLM to output image information with approximately four times the resolution.

[0003] The second method for achieving high-resolution images is to translate the DMD. By utilizing piezoelectric ceramics and other solutions to rapidly move the DMD back and forth between two positions perpendicular to the main optical axis of the projection lens system, separated by a half-pixel difference, the image can be jittered up and down. This, combined with rapid image splitting and image time-sequential display synthesis techniques, can achieve similar high-resolution projection images. Similar to the first solution, this dynamic image resolution enhancement technology requires high levels of back-and-forth motion control and mechanical precision. Furthermore, as the size and mass of the DMD increase, the required driving force also increases dramatically.

[0004] A third method for improving resolution involves image stitching, which involves directly stitching multiple DMDs together. Through specialized lens design and mirrors, the projected image is shifted, increasing resolution. This solution switches the projected image between position one and position two by rotating the mirror. This method still uses motion components as its core, requiring high repeatability. Achieving high-speed switching while simultaneously maintaining a long dwell time in positions one and two is challenging, and similarly requires overcoming challenges with servo accuracy and drive force.

[0005] The above methods for improving pixel resolution all require the use of motion devices, and the motion position of the motion devices must be precisely controlled to achieve pixel expansion, which makes the system unstable and is not conducive to providing stable high-resolution image display. Summary of the Invention

[0006] The purpose of this application is to provide an optical engine system and a projection system to achieve high-resolution image display.

[0007] In a first aspect, an embodiment of the present application provides an optical engine system, including a modulator and a light combining element. The modulator is configured to receive a first light beam and modulate the first light beam to emit a first modulated light beam. The modulator is also configured to receive a second light beam and modulate the second light beam to emit a second modulated light beam. The first modulated light beam and the second modulated light beam are the same frame image, and each first pixel in the first modulated light beam and the second pixel corresponding to the first pixel in the second modulated light beam are offset by a preset displacement value on a projection surface. The light combining element combines the first modulated light beam and the second modulated light beam and emits the combined light beams.

[0008] In some embodiments, the modulator includes a first modulator and a second modulator, the first modulator is used to modulate the first light beam to emit first modulated light, and the second modulator is used to modulate the second light beam to emit second modulated light.

[0009] In some embodiments, the light combining element includes a first area, a second area, and a third area, and image lights of the same color in the first modulated light and the second modulated light are incident on different areas of the light combining element.

[0010] In some embodiments, the first region may transmit blue light and reflect non-blue light, the second region may transmit red light and reflect non-red light, and the third region may transmit green light and reflect non-green light.

[0011] In some embodiments, the first region, the second region, and the third region are distributed in a fan shape.

[0012] In some embodiments, the light combining element includes a first light combining element and a second light combining element, wherein the first light combining element is located on the optical path of the first modulated light, and the second light combining element is located on the optical path of the second modulated light, so that the first modulated light and the second modulated light are offset by a preset displacement value on the projection surface.

[0013] In some embodiments, the optical engine system further includes a first light distribution system and a second light distribution system. The first light distribution system receives the first light beam, converts the first light beam into a surface distribution state, and guides the first light beam to a first modulator for modulation to emit a first modulated light beam. The first modulated light beam then passes through the first light distribution system and is guided to a light combining element. The second light distribution system receives the second light beam, converts the second light beam into a surface distribution state, and guides the second light beam to a second modulator for modulation to emit a second modulated light beam. The second modulated light beam then passes through the second light distribution system and is guided to the light combining element.

[0014] In some embodiments, the optical engine system further includes a first lens and a second lens, the first lens receiving the first light beam and directing the first light beam to the first light distribution system, and the second lens receiving the second light beam and directing the second light beam to the second light distribution system.

[0015] In a second aspect, the present application further provides a projection system, comprising a first light source, a second light source and the above-mentioned optical engine system, wherein the first light source is used to emit a first light beam, and the second light source is used to emit a second light beam.

[0016] In some embodiments, the first light source and the second light source each include a first light emitting device, a second light emitting device, and a third light emitting device for emitting light of different colors, and the first light emitting device, the second light emitting device, and the third light emitting device are arranged in a circular array to emit a first light beam or a second light beam with an angular distribution.

[0017] In some embodiments, the first light source further includes a first double fly-eye lens, and the first double fly-eye lens is used to homogenize the first light beam; the second light source further includes a first double fly-eye lens, and the second double fly-eye lens is used to homogenize the second light beam.

[0018] In some embodiments, the projection system also includes a lens, which includes a first lens group and a second lens group. The first lens group is located on the optical path from the first modulated light to the light combining element and on the optical path from the second modulated light to the light combining element, and the second lens group is located on the optical path of the image light emitted from the light combining element.

[0019] The optical engine system and projection system provided in the present application modulate a first light beam to form a first modulated light through a modulator, and simultaneously modulate a second light beam to form a second modulated light. At the same time, each first pixel on the first modulated light and the second pixel corresponding to the first pixel on the second modulated light are offset by a preset displacement value on the projection surface. Since the first modulated light and the second modulated light are the same frame image, the first modulated light and the second modulated light are superimposed on each other, so that the horizontal and vertical pixel points of the projected image are doubled, thereby achieving the purpose of expanding pixel resolution and realizing high-resolution image display.

[0020] These and other aspects of the present application will become more readily apparent from the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a structural diagram of an optical engine system provided in an embodiment of the present application.

[0023] Figure 2 This is a structural schematic diagram of a light combining element provided in an embodiment of the present application at a first viewing angle.

[0024] Figure 3 This is a structural schematic diagram of a light combining element provided in an embodiment of the present application at a second viewing angle.

[0025] Figure 4 Schematic diagram of a projection system according to an embodiment of the present invention.

[0026] Figure 5 This is a structural diagram of a first light source or a second light source provided in an embodiment of the present application.

[0027] Figure 6 It is a structural schematic diagram of another projection system provided in an embodiment of the present application.

[0028] Figure 7 It is a structural diagram of another optical engine system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0030] The inventors of this application have proposed an optical engine system and a projection system in the embodiments of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0031] See Figure 1, this embodiment provides an optical engine system 10, including a light combining element 500 and a modulator. The modulator is a device for modulating a received light beam emitted by a light source and emitting modulated light, and is arranged on the optical path of the light beam emitted by the light source. The modulator is used to receive a first light beam, modulate the first light beam to emit a first modulated light, and also to receive a second light beam, modulate the second light beam to emit a second modulated light. The modulator can be one, in which case the modulator can receive one or more light beams and modulate them. There can also be two or more modulators, and each modulator receives one light beam and modulates it. One light beam is emitted by one light source. When there are two or more light beams, they need to be provided by two or more light sources. Alternatively, one light source can provide two or more light beams in different directions.

[0032] The first modulated light and the second modulated light represent the same frame image, and each first pixel in the first modulated light and each second pixel corresponding to the first pixel in the second modulated light are offset on the projection surface by a predetermined displacement value. The first light beam and the second light beam can be generated by different light sources and received and modulated by the modulator to form the first modulated light and the second modulated light.

[0033] Specifically, the modulator may include a first modulator 200 and a second modulator 400, wherein the first modulator 200 is used to receive a first light beam and modulate the first light beam to emit a first modulated light, and the second modulator 400 is used to receive a second light beam and modulate the second light beam to emit a second modulated light, wherein the first modulated light and the second modulated light are the same frame image, and the "same frame image" here means that at the same moment, the first modulated light generated by the first modulator 200 receiving the first light beam modulation and the second modulated light formed by the second modulator 400 receiving the second light beam modulation are the same frame image.

[0034] Each first pixel in the first modulated light is offset from the corresponding second pixel in the second modulated light by a predetermined displacement value on the projection surface. The predetermined displacement value between each first pixel and the corresponding second pixel is equal, and the displacement direction is also the same. It should be understood that the terms "first" and "second" are used merely for distinction and do not represent a difference in importance.

[0035] Since the first modulated light and the second modulated light are offset by a preset displacement value, when the first modulated light and the second modulated light are simultaneously projected onto the projection surface, a superposition effect is formed, and each first pixel and each second pixel corresponding to the first pixel form a pixel offset effect, thereby achieving an expansion of the pixel resolution, thereby improving the resolution of the image displayed on the projection surface.

[0036] In some embodiments, the preset displacement value is (n / 2) pixel values, where n is a positive integer. That is, the preset displacement value can be half a pixel value, one pixel value, 3 / 2 pixel value, etc. In particular, the preset displacement value can be 1 / 2 pixel value. The advantage of this setting is that since the first modulator 200 and the second modulator 400 are both formed by an array composed of a plurality of microlenses, one microlens corresponds to one pixel, and there will be a slight gap between adjacent microlenses. Therefore, in the first modulated light and the second modulated light, there will also be gaps between adjacent pixel points. When the preset displacement value is 1 / 2 pixel value, the first modulated light and the second modulated light will cover the gaps between each pixel point when superimposed, thereby achieving a better effect of improving resolution. Of course, it is understandable that in some other embodiments, the preset displacement value can also be other values.

[0037] Specifically, the first modulator 200 is used to receive a first light beam, modulate the first light beam to emit a first modulated light, and guide the first modulated light to the light combining element 500. The second modulator 400 is used to receive a second light beam, modulate the second light beam to emit a second modulated light, and guide the second modulated light to the light combining element 500.

[0038] In this embodiment, please continue to refer to Figure 1 The optical engine system 10 also includes a first light distribution system 210 and a second light distribution system 410. The first light distribution system 210 is located on the propagation path of the first light beam. The first light distribution system 210 receives the first light beam and converts the first light beam into a surface distribution state, and guides the first light beam converted into a surface distribution state to the first modulator 200 for modulation to emit a first modulated light. After the emission, the first modulated light passes through the first light distribution system 210 again and is guided to the light combining element 500. The surface distribution of light can be understood as converting a beam of light with a certain divergence angle into light distributed on the same surface. When the first modulated light passes through the first light distribution system 210 again, it is again converted from a surface distribution state to an angular distribution state. That is, when the first modulated light is guided to the light combining element 500, it is in an angular distribution state. The angular distribution of light can be understood as converting light distributed on the same plane into a beam of light with a certain divergence angle.

[0039] The second light distribution system 410 is located along the propagation path of the second light beam. The second light distribution system 410 receives the second light beam and converts it into a planar distribution state. It then directs the converted planar distribution second light beam to the second modulator 400 for modulation, thereby emitting a second modulated light beam. The emitted second modulated light beam then passes through the second light distribution system 410 again before being directed to the light combining element 500. When the first modulated light beam passes through the second light distribution system 410 again, it is again converted from a planar distribution state to an angular distribution state. That is, when the second modulated light beam is directed to the light combining element 500, it assumes an angular distribution state.

[0040] In some embodiments, please see Figure 1 The optical engine system 10 further includes a first lens 220 and a second lens 420. The first lens 220 receives the first light beam and directs the first light beam to the first light distribution system 210. After passing through the first lens 220 and the first light distribution system 210, the angular distribution state of the first light beam changes to a surface distribution state. The second lens 420 receives the second light beam and directs the second light beam to the second light distribution system 410. After passing through the second lens 420 and the second light distribution system 410, the angular distribution state of the second light beam changes to a surface distribution state.

[0041] It is understandable that, in some embodiments, the first light beam may be in a surface distribution state when emitted. In this case, the first lens 220 may not be provided, and similarly, the second lens 420 may not be provided.

[0042] See Figure 2 The light combining element 500 includes a first surface 510 and a second surface 520 facing each other, wherein the first surface 510 and the second surface 520 are both planes. In this embodiment, the first surface 510 and the second surface 520 are arranged substantially parallel to each other. In this embodiment, the light combining element 500 is a wavelength light combining element 500, that is, the light combining element 500 can transmit light in a specific wavelength band and reflect light in a non-specific wavelength band, so that light beams of different wavelength bands are selectively reflected or transmitted when incident on the light combining element 500.

[0043] As an implementation method, see Figure 3 The light combining element 500 includes a first region 521, a second region 522, and a third region 523. The first region 521, the second region 522, and the third region 523 can be arranged adjacent to each other or spaced apart. In this embodiment, the first region 521, the second region 522, and the third region 523 are distributed in a fan-shaped manner and together form a substantially circular shape. The areas of the first region 521, the second region 522, and the third region 523 can be substantially equal. This arrangement ensures that the first region 521, the second region 522, and the third region 523 have the same transmission area.

[0044] As mentioned above, the first light beam includes red light, blue light, and green light, and similarly, the second light beam includes red light, blue light, and green light. In this embodiment, the red light, blue light, and green light in the first and second light beams are all angularly distributed, that is, the red light, blue light, and green light are arranged in a roughly circular array, and the radiation area of ​​each color of light is roughly fan-shaped. Furthermore, the radiation area of ​​each color of light is roughly equal to the area of ​​the first region 521, the second region 522, and the third region 523. This allows the first modulated light and the second modulated light to be converted into an angular distribution state, and each color of light can be correspondingly guided to the first region 521, the second region 522, or the third region 523. Each color of light can be efficiently utilized, reducing light loss.

[0045] In this embodiment, the first modulated light is guided to the first surface 510 of the light combining element 500 and then passes through the first surface 510 . The first modulated light is combined with the second modulated light guided to the second surface 520 of the light combining element 500 and then emitted.

[0046] As one approach, the first region 521 can transmit blue light and reflect non-blue light, the second region 522 can transmit red light and reflect non-red light, and the third region 523 can transmit green light and reflect non-green light. That is, the first region 521 can transmit light in the blue wavelength range and reflect light in the non-blue wavelength range; the second region 522 can transmit light in the red wavelength range and reflect light in the non-red wavelength range; and the first regions 521-523 can transmit light in the green wavelength range and reflect light in the non-green wavelength range. For example, the blue wavelength range is 440-475 nm, the red wavelength range is 625-740 nm, and the green wavelength range is 492-577 nm. As one embodiment, the first region 521 can transmit blue light and reflect green light, the second region 522 can transmit red light and reflect blue light, and the third region 523 can transmit green light and reflect red light.

[0047] Image lights of the same color in the first modulated light and the second modulated light are incident on different areas of the light combining element 500. For example, the blue light in the first modulated light is incident on the first area 521, and the blue light in the second modulated light is incident on the second area 522 or the third area 523. The red light in the first modulated light is incident on the second area 522, and the red light in the second modulated light is incident on the first area 521 or the third area 523. The green light in the first modulated light is incident on the third area 523, and the green light in the second modulated light is incident on the first area 521 or the second area 522. In this way, each color light in the first modulated light can pass through the light combining element 500, while each color light in the second modulated light is reflected by the light combining element 500, so that the first modulated light and the second modulated light are combined and emitted.

[0048] It is understood that in some other embodiments, the first region 521 may transmit non-blue light and reflect blue light, the second region 522 may transmit non-red light and reflect red light, and the third region 523 may transmit non-green light and reflect green light. In this case, the first and second light beams may be combined.

[0049] The optical engine system 10 provided in this embodiment modulates the first light beam to form a first modulated light through the first modulator 200, and modulates the second light beam to form a second modulated light through the second modulator 400. At the same time, each first pixel on the first modulated light and the second pixel corresponding to the first pixel on the second modulated light are offset by a preset displacement value on the projection surface. Since the first modulated light and the second modulated light are the same frame image, the first modulated light and the second modulated light are superimposed on each other, so that the horizontal and vertical pixel points of the projected image are doubled, thereby achieving the purpose of expanding pixel resolution and realizing high-resolution image display.

[0050] See Figure 4 This embodiment further provides a projection system 20, including a first light source 100, a second light source 300 and the above-mentioned optical engine system 10, wherein the first light source 100 is used to emit a first light beam, and the second light source 300 is used to emit a second light beam.

[0051] In this embodiment, please refer to Figure 4 and Figure 5 The first light source 100 and the second light source 300 each include a first light emitting device 110, a second light emitting device 120, and a third light emitting device 130 for emitting light of different colors. The first light emitting device 110, the second light emitting device 120, and the third light emitting device 130 are arranged in a circular array and supported on a support 150. That is, the first light emitting device 110, the second light emitting device 120, and the third light emitting device 130 are arranged around the principal optical axis of the first light beam or the second light beam to emit the first light beam or the second light beam in an angular distribution. As an example, the first light emitting device 110 is configured to emit red light, the second light emitting device 120 is configured to emit blue light, and the third light emitting device 130 is configured to emit green light.

[0052] The arrangement of the three light emitting devices in the first light source 100 differs from the arrangement of the three light emitting devices in the second light source 300, so that the light of the same color emitted by the first and second light sources enters different areas of the light combining device 500. For example, the three light emitting devices in the first light source 100 are arranged as follows: first light emitting device 110, second light emitting device 120, and third light emitting device 130; at the corresponding positions in the first light source 100, the three light emitting devices in the second light source 300 are arranged as follows: second light emitting device 120, third light emitting device 130, and first light emitting device 110.

[0053] As an embodiment, the excitation of the first light source 100 and the second light source 300 can be light emitted by light emitting devices at the same position on the first light source 100 and the second light source 300. This is described using the example of the first light emitting device 110 emitting red light, the second light emitting device 120 emitting blue light, and the third light emitting device 130 emitting green light. Specifically, when the first light emitting device 110 on the first light source 100 emits red light, the second light emitting device 120 at the corresponding position on the second light source 300 emits blue light; when the second light emitting device 120 on the first light source 100 emits blue light, the third light emitting device 130 at the corresponding position on the second light source 300 emits green light; and when the third light emitting device 130 on the first light source 100 emits green light, the first light emitting device 110 at the corresponding position on the second light source 300 emits red light.

[0054] As another embodiment, the excitation of the first light source 100 and the second light source 300 can be the light emitted by the light emitting devices at different positions on the first light source 100 and the second light source 300. For example, the light of the same color of the first light source 100 and the second light source 300 can be emitted at the same time. Since the three light emitting devices of the first light source 100 and the three light emitting devices of the second light source 300 are staggered, the light combining of the first modulated light and the second modulated light will not be affected when the light is combined on the light combining device 500. Since the three light emitting devices of the first light source 100 and the three light emitting devices of the second light source 300 are staggered, the two image modulated lights of the same color will be incident on different areas of the light combining element 500 respectively.

[0055] Furthermore, as an embodiment, the first light emitting device 110, the second light emitting device 120 and the third light emitting device 130 are all configured to emit light with a radiation area equal to the area of ​​the first region 521, the second region 522 and the third region 523 of the light combining element 500, so that the first light beam emitted by the first light source 100 can be completely incident on the light combining element 500 after being modulated by the first modulator 200, and similarly, the second light beam emitted by the second light source 300 can be completely incident on the light combining element 500 after being modulated by the second modulator 400.

[0056] In some embodiments, please refer again to Figure 4The first light source 100 further includes a first fly-eye lens 140, which is located on the propagation path of the first light beam and is used to homogenize the first light beam. Specifically, in this embodiment, after the first light beam is emitted, it is first homogenized by the first fly-eye lens 140, and then it is incident on the first light distribution system 210 through the first lens 220. The second fly-eye lens 340 is located on the propagation path of the second light beam and is used to homogenize the second light beam. Specifically, in this embodiment, after the second light beam is emitted, it is first homogenized by the second fly-eye lens 340, and then it is incident on the second light distribution system 410 through the second lens 420.

[0057] In this embodiment, please continue to refer to Figure 4 The projection system 20 also includes a lens 600, which includes a first lens group 610 and a second lens group 620. There are two first lens groups, and the two first lens groups 610 are respectively located on the optical path from the first modulated light to the light combining element 500 and the optical path from the second modulated light to the light combining element 500. The second lens group 620 is located on the optical path of the image light emitted from the light combining element 500. When the first modulated light is generated and emitted from the first modulator 200, the image light of the first modulated light first passes through the first light distribution system 210, and then passes through one of the first lens groups 610 and is guided to the light combining element 500. As a result, the image light of the first modulated light is converted from a surface distribution state to an angular distribution state. When the second modulated light is generated and emitted from the second modulator 400, the image light of the second modulated light first passes through the second light distribution system 410, and then passes through the other first lens group 610 and is guided to the light combining element 500. As a result, the image light of the second modulated light is converted from a surface distribution state to an angular distribution state. The light combining element 500 is placed at the focus position of the two first lens groups 610, that is, the image light forms a reduced image at the light combining element 500. In other words, the first modulated light and the second modulated light share some lenses, which can save costs on the one hand and improve the clarity of the image after light combination on the other hand.

[0058] See Figure 6The projection system 20 may further include a control device 700, which is configured to receive an input image. In this embodiment, as an implementation method, the control device 700 is further configured to split the input image into a first image and a second image. The first image and the second image are the same frame image. The first image is projected by the first light source 100 as a first light beam, and the second image is projected by the second light source 300 as a second light beam. During image splitting, the high-resolution image can be split diagonally into two low-resolution images according to an image splitting algorithm. The resolution of both the first image and the second image is lower than that of the input image. Specifically, the input image is split into two low-resolution images, which are modulated by a low-resolution modulator. The modulated image lights are then combined. Because the imaging positions of the first and second modulated images are dislocated by half a pixel, the first and second modulated lights are superimposed to form a spliced ​​image after combination. In the spliced ​​image, the first and second modulated lights do not completely overlap, thereby improving the resolution of the resulting image. The resolution of the combined first and second modulated lights is higher than that of the input image.

[0059] The control device 700 may be a central processing unit (CPU) or other programmable controllers.

[0060] The projection system 20 provided in this embodiment applies the above-mentioned optical engine system 10. The first modulator 200 modulates the first light beam to form a first modulated light, and the second modulator 400 modulates the second light beam to form a second modulated light. At the same time, each first pixel on the first modulated light and the second pixel corresponding to the first pixel on the second modulated light are offset by a preset displacement value on the projection surface. Since the first modulated light and the second modulated light are the same frame image, they are superimposed on each other to achieve the purpose of pixel resolution expansion, thereby realizing high-resolution image display.

[0061] Second embodiment

[0062] This embodiment provides a projection system 20, see Figure 7 , which includes a first light source 100 , a second light source 300 and an optical engine system 10 , wherein the optical engine system 10 includes a modulator 30 and a light combining element 500 .

[0063] The first light source 100 is configured to emit a first light beam, and the second light source 300 is configured to emit a second light beam. The first light source 100 and the second light source 300 are spaced apart and arranged side by side so that the first light beam and the second light beam are emitted substantially parallel to each other. Each of the first light beam and the second light beam includes red light, green light, and blue light.

[0064] In this embodiment, the optical engine system 10 includes only one modulator 30, which is used to receive a first light beam and modulate the received first light beam to emit a first modulated light. The modulator 30 is also used to receive a second light beam and modulate the received second light beam to emit a second modulated light. The first modulated light and the second modulated light are the same frame image. When the first modulated light and the second modulated light are emitted from the modulator 30, they are emitted along the same optical path. It is understandable that in some other embodiments, the number of modulators 30 can be two or more.

[0065] The projection system 20 also includes a lens group 40 and a light distribution system 50, which are located on the optical path between the first light source 100 and the second light source 300 to the modulator 30, and are used to convert the first light beam and the second light beam in an angular distribution state into a surface distribution and guide them to the modulator 30. They are also used to convert the first light beam and the second light beam in a surface distribution state into an angular distribution and guide them to the modulator 30.

[0066] The light combining element 500 is located on the optical path of the first modulated light and the second modulated light, and is used to combine the first modulated light and the second modulated light for output. In this embodiment, the light combining element 500 includes a first light combining element 530 and a second light combining element 540. The first light combining element 530 and the second light combining element 540 are both arranged at an angle relative to the optical path of the first modulated light and the second modulated light, and the first light combining element 530 and the second light combining element 540 are arranged symmetrically along the optical path of the first modulated light and the second modulated light. The first light combining element 530 is located on the optical path of the first modulated light, and the second light combining element 540 is located on the optical path of the second modulated light. The first light combining element 530 and the second light combining element 540 are used to form a disturbance on the first modulated light and the second modulated light, thereby generating an offset on the projection surface. By reasonably controlling the offset amount, the first modulated light and the second modulated light can generate a pixel offset distance that meets the requirements, thereby achieving a fixed pixel expansion effect. The pixel offset distance of the first modulated light and the second modulated light on the projection surface can be, for example, 1 / 2 pixel.

[0067] Specifically, image display with higher pixel resolution can be achieved by:

[0068] 1) The first light source 100 and the second light source 300 are turned on and off in an interval sequence, i.e., when the first light source 100 is turned on, the second light source 300 is turned off, and when the second light source 300 is turned on, the first light source 100 is turned off, and the above operation is performed alternately. Because there is an offset between the images formed on the projection surface by the first modulated light after the first light beam is modulated by the modulator 30 and the second modulated light after the second light beam is modulated by the modulator 30, when the interval sequence is short enough, due to the persistence of vision phenomenon, the image viewed by the user is a superposition of the first modulated light and the second modulated light, thereby achieving a display with higher pixel resolution.

[0069] 2) The image input to the projection system 20 is split into a first image and a second image, where the first image and the second image are the same frame image. The first image and the second image are projected by the first light source 100 and the second light source 300, respectively. By controlling the output timing of the first light source 100 and the second light source 300, the first modulated light and the second modulated light form a pixel offset effect on the projection surface, thereby achieving higher resolution image display.

[0070] 3) It is also possible to combine the above 1) and 2) to achieve higher resolution image display.

[0071] In some embodiments, the projection system 20 further includes a lens, which includes a first lens group 610 and a second lens group 620. The first lens group 610 is located on the optical path of the first modulated light and the second modulated light to the light combining element 500. The second lens group 620 is located on the optical path of the image light emitted from the light combining element 500.

[0072] The optical engine system 10 and projection system 20 of this embodiment achieve light source switching and separation of illumination from different light sources near the projection surface by controlling the different angular distributions of the first light source 100 and the second light source 300 incident on the modulator 30. This achieves fixed pixel expansion without the need for vibration elements or drive devices, providing stable, higher-resolution image display.

[0073] The foregoing description is merely a preferred embodiment of the present application and is not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An optical engine system, characterized in that: include: a modulator configured to receive a first light beam and modulate the first light beam to emit a first modulated light, and further configured to receive a second light beam and modulate the second light beam to emit a second modulated light, wherein the first modulated light and the second modulated light constitute a same frame image, and each first pixel in the first modulated light and a second pixel corresponding to the first pixel in the second modulated light are offset on a projection surface by a preset displacement value; A light-combining element combines the first modulated light and the second modulated light and emits the combined light. The light-combining element includes a first light-combining element and a second light-combining element. The first light-combining element is located on the optical path of the first modulated light, and the second light-combining element is located on the optical path of the second modulated light. The first light-combining element and the second light-combining element are both tilted relative to the optical paths of the first modulated light and the second modulated light, so that the first modulated light and the second modulated light are offset by a preset displacement value on the projection surface.

2. The optical engine system according to claim 1, wherein: The modulator includes a first modulator and a second modulator, the first modulator is used to modulate the first light beam to emit the first modulated light, and the second modulator is used to modulate the second light beam to emit the second modulated light.

3. The optical engine system according to claim 2, wherein: The optical engine system further includes a first light distribution system and a second light distribution system. The first light distribution system receives the first light beam, converts the first light beam into a surface distribution state, and guides the first light beam to the first modulator for modulation to emit a first modulated light. The first modulated light is then guided to the light combining element through the first light distribution system. The second light distribution system receives the second light beam, converts the second light beam into a surface distribution state, and guides it to the second modulator for modulation to emit second modulated light. The second modulated light is then guided to the light combining element through the second light distribution system.

4. The optical engine system according to claim 3, wherein: The optical engine system further includes a first lens and a second lens, wherein the first lens receives the first light beam and directs the first light beam to the first light distribution system, and the second lens receives the second light beam and directs the second light beam to the second light distribution system.

5. A projection system, characterized in that: include: a first light source, configured to emit a first light beam; a second light source, configured to emit a second light beam; as well as The optical engine system according to any one of claims 1 to 4.

6. The projection system according to claim 5, wherein: The first light source and the second light source each include a first light emitting device, a second light emitting device, and a third light emitting device for emitting light of different colors. The first light emitting device, the second light emitting device, and the third light emitting device are arranged in a circular array to emit the first light beam or the second light beam with an angular distribution.

7. The projection system according to claim 6, wherein: The first light source further includes a first double fly-eye lens, and the first double fly-eye lens is used to homogenize the first light beam; The second light source further includes a second double fly-eye lens, and the second double fly-eye lens is used to homogenize the second light beam.

8. The projection system according to claim 7, wherein: The projection system also includes a lens, which includes a first lens group and a second lens group. The first lens group is located on the optical path from the first modulated light to the light combining element and on the optical path from the second modulated light to the light combining element. The second lens group is located on the optical path of the image light emitted from the light combining element.

Images