WO2022268221A1

WO2022268221A1 - Optical engine and laser projection device

Info

Publication number: WO2022268221A1
Application number: PCT/CN2022/101340
Authority: WO
Inventors: 杜玉楠; 阴亮
Original assignee: 青岛海信激光显示股份有限公司
Priority date: 2021-06-24
Filing date: 2022-06-24
Publication date: 2022-12-29

Abstract

An optical engine (A) and a laser projection device (10). The optical engine (A) comprises: a light source assembly (111a), a prism assembly (113a), a light valve assembly (114a), and a lens assembly (14). The light valve assembly (114a) comprises at least two light valves. The prism assembly (113a) comprises a light source light incident surface (B1), a prism light exit surface (B4), and at least two light valve light incident surfaces having one-to-one correspondence to the at least two light valves; the prism assembly (113a) can receive at least two beams of incident light by means of the light source light incident surface (B1) so as to guide the incident light corresponding to each light valve to the corresponding light valve, respectively, and can guide a beam output by each light valve to the prism light exit surface (B4) to direct same to the lens assembly (14).

Description

Optical engine and laser projection equipment

The disclosure requirements of this application are submitted on June 24, 2021, and the application number is 202110703588.7; on June 24, 2021, the application number is 202110702786.1; on June 28, 2021, the application number is 202110717613.7; Priority of Chinese Patent Application No. 202110717670.5 filed on June 28, 2021, the entire contents of which are incorporated herein by reference.

technical field

The present disclosure relates to laser projection technology, in particular, to an optical engine and laser projection equipment.

Background technique

At present, laser projection technology is a new type of projection technology on the market. The main characteristics of laser light sources are high brightness, bright colors, low energy consumption, long life and small size, which makes laser projection technology have high picture contrast and clear imaging. characteristics, so laser projection technology has become the mainstream development direction in the market. With the development of projector technology and market, in order to enable users to experience better viewing enjoyment when using the projector during the daytime, a projector with higher brightness is required, and a multi-light valve system is required.

Contents of the invention

Some embodiments of the present disclosure provide an optical engine, and the optical engine includes: a light source assembly, a light uniform assembly, a prism assembly, a light valve assembly, and a lens assembly arranged in sequence along the direction of the light path; the light uniform assembly includes a first uniform light assembly a light component and a second light uniform component, the first light uniform component is used to guide the first color light provided by the light source component to the prism component after uniform light treatment, and the second light uniform component is used to The second color light provided by the light source assembly is homogenized and directed to the prism assembly, the prism assembly is used to guide the light beam received from the light homogenization assembly to the light valve, and the lens assembly receives the light valve The outgoing image beam projects the picture onto the screen.

Some embodiments of the present disclosure provide a laser projection device, where the laser projection device includes any one of the optical engines described above.

Description of drawings

FIG. 1 is a schematic diagram of an implementation environment shown in some embodiments of the present disclosure;

FIG. 2A is a schematic structural diagram of an optical engine in the related art;

FIG. 2B is a schematic structural diagram of another optical engine in the related art;

Fig. 3 is a schematic structural diagram of an optical engine shown in some embodiments of the present disclosure;

Fig. 4 is a structural schematic diagram of a prism assembly and a light valve assembly in the optical engine shown in Fig. 3;

Fig. 5 is a structural schematic diagram of another prism assembly and light valve assembly in the optical engine shown in Fig. 3;

Fig. 6 is a schematic structural diagram of another optical engine shown in some embodiments of the present disclosure;

Fig. 7 is a schematic structural diagram of another optical engine shown in some embodiments of the present disclosure;

Fig. 8 is a schematic diagram of a picture projected by the optical engine provided by some embodiments of the present disclosure;

Fig. 9 is a schematic diagram of a picture projected by the optical engine provided by some embodiments of the present disclosure

10 is a schematic structural diagram of an optical engine in the related art;

Fig. 11 is a schematic diagram of the light intensity distribution of the outgoing light beam of the light source assembly;

Fig. 12 is the effect diagram of the purpose of homogenizing the light beam;

Fig. 13 is a schematic structural diagram of an optical engine provided by some embodiments of the present disclosure;

Fig. 14 is a schematic diagram of a field of view of an optical engine provided by some embodiments of the present disclosure;

Fig. 15 is a schematic structural diagram of another optical engine provided by some embodiments of the present disclosure;

Fig. 16 is a schematic diagram of the light intensity distribution of a first light beam after being homogenized in the embodiment shown in Fig. 15;

Fig. 17 is a schematic diagram of light intensity distribution of a second light beam after being homogenized in the embodiment shown in Fig. 15;

Fig. 18 is a schematic diagram of a light intensity distribution after superposition of light intensities of two light beams in the embodiment shown in Fig. 15;

Fig. 19 is a structural design diagram of another optical engine provided by some embodiments of the present disclosure;

Fig. 20 is a schematic structural diagram of another optical engine provided by some embodiments of the present disclosure;

Fig. 21 is a schematic structural diagram of an optical engine provided by some embodiments of the present disclosure;

Fig. 22 is a schematic diagram of the angle of the red and green mixed color light incident on the light guide in the related art;

23 is a schematic diagram of the angle of blue light incident on the light guide in the related art;

Fig. 24 is a schematic diagram of light paths of different colored lights in a light guide in the related art.

detailed description

In order to make the purpose, implementation and advantages of the present disclosure clearer, the exemplary embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings in the exemplary embodiments of the present disclosure. Obviously, the described exemplary embodiments It is only a part of the embodiments of the present disclosure, but not all the embodiments.

FIG. 1 is a schematic diagram of an implementation environment shown by some embodiments of the present disclosure, and the implementation environment may include a laser projection device 10 . The laser projection device 10 may include an optical engine A and a projection screen B. As shown in FIG. The optical engine A includes a light source component, and the optical engine A is used to process the light source provided by the light source component, and project the light beam onto the projection screen B through a preset pattern. In some embodiments, using an optical engine A with multiple light valves (not shown in FIG. 1 ), multiple prism assemblies (not shown in FIG. 1 ) corresponding to the multiple light valves are used to separate multiple The illumination light beam and imaging light beam of the light valve can improve the brightness of the laser projection device 10 . In some embodiments, projection screen B is used to carry the pattern projected by optical engine A. The projection screen B can be made of various materials, such as polyvinyl chloride (PVC), metal, glass fiber, and glass beads. In some embodiments, the laser projection device 10 may not include the projection screen B, and the optical engine A projects the projection pattern toward the wall.

FIG. 2A is a schematic structural diagram of an optical engine in the related art. The optical engine includes an illumination mirror assembly 101 , a prism assembly 102 , a light valve assembly 103 and a lens assembly 104 . Two illuminating light beams emitted by the illuminating mirror assembly 101 respectively enter the two light valves of the light valve assembly 103 through the prism assembly 102 , and the imaging light beams emitted by the two light valves pass through the prism assembly 102 and respectively enter the lens assembly 104 . The optical engine has two prism units corresponding to the two light valves for respectively inputting light beams to the lens assembly.

FIG. 2B is a schematic structural diagram of another optical engine in the related art. The optical engine includes a light source assembly 105 , an optical path assembly 106 , a light valve assembly 107 and a lens assembly 108 . Wherein, the light valve assembly 107 includes two light valves, the light path assembly 106 includes four prism assemblies, and each prism assembly includes two prisms. The four prism components in the optical engine are used to separate the illuminating beams emitted by the illuminating mirror group, guide the separated illuminating beams to the two light valves, respectively receive the imaging beams emitted by the two light valves, and combine the two beams The imaging beam is then directed to the lens assembly.

However, in the above-mentioned related technologies, the optical engine uses more prism components, which leads to a relatively large volume of the optical engine. Some embodiments of the present disclosure provide an optical engine capable of solving the problems in the above-mentioned related technologies.

Fig. 3 is a schematic structural diagram of an optical engine shown in some embodiments of the present disclosure. In some embodiments, the optical engine may include: a light source assembly 111 a , a prism assembly 113 a , a light valve assembly 114 a and a lens assembly 14 . The light valve assembly 114a includes at least two light valves (eg, a first light valve 1141a and a second light valve 1142a). The prism assembly 113a includes: a light incident surface B1 of a light source, a prism light exit surface B4, and at least two light valve light incident surfaces (for example, The light incident surface B2 of the first light valve and the light incident surface B3 of the second light valve). Each light valve (the first light valve 1141a or the second light valve 1142a) is located outside the corresponding light valve incident surface (the first light valve incident surface B2 or the second light valve incident surface B3), and the lens assembly 14 is located Outside the light emitting surface B4 of the prism, the light source assembly 111a is located outside the light incident surface B1 of the light source.

The light source assembly 111a is used to provide at least two beams of incident light corresponding to at least two light valves (first light valve 1141a and second light valve 1142a) to the light incident surface B1 (for example, the first incident light Two incident light S2). The prism assembly 113a is used to direct the incident light (the first incident light S1 and the second incident light S2) corresponding to each light valve (the first light valve 1141a or the second light valve 1142a) to the corresponding light valve (the first light valve 1142a) respectively. valve 1141a or second light valve 1142a).

The light valve (the first light valve 1141a or the second light valve 1142a) is used to process the received light beam (the first incident light S1 or the second incident light S2) and output it to the corresponding light incident surface of the light valve (the first light The light incident surface B2 of the second light valve or the light incident surface B3 of the second light valve). The prism assembly 113a is used to guide the light beam output by the light valve (the first light valve 1141a or the second light valve 1142a) (Fig. To the lens assembly, that is, the prism assembly 113a can receive at least two beams of incident light (S1 and S2), and the light beams (S3 and S4) output by at least two light valves (S1 and S2) can be guided to the lens assembly 14 through the same prism light-emitting surface B4.

It should be noted that the number of light valves in the light valve assembly 114 a and the number of light beams output by the light valves are not limited.

In summary, some embodiments of the present disclosure provide an optical engine including a light source assembly, a prism assembly, a light valve assembly, and a lens assembly. The light valve assembly includes at least two light valves, and the prism assembly includes a light incident surface of a light source, a light exit surface of a prism, and at least two light valve light entrance surfaces corresponding to at least two light valves one-to-one. The prism assembly can receive at least two beams of incident light through a light incident surface of the light source, so as to guide the incident light corresponding to each light valve to the corresponding light valve, and can guide the light beam output by each light valve to a prism light exit surface, and Shoot the lens assembly. The prism component has a small structure, can reduce the volume of the optical engine, can solve the problem of the large size and volume of the optical engine in the related art, and achieve the effect of reducing the volume of the optical engine.

In addition, the prism outgoing light S3 output by the first light valve 1141 a and the prism outgoing light S4 output by the second light valve 1142 a are superimposed with a displacement. In this way, the prism outgoing light S3 output by the first light valve 1141 a and the prism outgoing light S4 output by the second light valve 1142 a emitted by the lens assembly 14 can be shifted and superimposed, thereby increasing the resolution of the image projected by the lens assembly 14 .

In some embodiments, FIG. 4 is a schematic structural diagram of a prism assembly and a light valve assembly in the optical engine shown in FIG. 3 . As shown in FIG. 4 , the second light incident surface B7 of the wedge prism 123 is attached to the first light exit surface B5 of the first prism 121 . The prism assembly 113 a includes a first prism 121 and a second prism 122 . Prism assemblies can be used to separate the illumination and imaging beams in the optical path. The first prism 121 is surrounded by the light incident surface B1 of the light source, the first light exit surface B5 and the first light valve light incident surface B2 corresponding to the first light valve 1141a of the at least two light valves. The first prism 121 may be a total internal reflection prism (English: Total internal reflection; abbreviation: TIR). Total internal reflection is an optical phenomenon, that is, when light passes through two media with different refractive indices, part of the light will be refracted at the interface of the medium, and the rest will be reflected. However, when the angle of incidence is greater than the critical angle (the light is far away from the normal), the light will stop entering the other interface and all be reflected towards the inner surface. ) into the case of an optically sparse medium (a medium with a lower refractive index). When the incident angle is greater than the critical angle, because there is no refraction (the refracted light disappears) and all are reflections, it is called total internal reflection.

The second prism 122 is surrounded by the prism light exit surface B4, the first light entrance surface B6, and the second light valve light entrance surface B3 corresponding to the second light valve 1142a of the at least two light valves. The first prism 121 can be reversed. Total reflection prism (English: Reverse Total Internal Reflection, abbreviation: RTIR). The total retroreflective prism may be a rectangular isosceles prism.

In some embodiments, as shown in FIG. 3 , the first light-emitting surface B5 of the first prism 121 is opposite to the first light-incoming surface B6 of the second prism 122 , and the light-incoming surface B1 of the light source can be connected to the light-incoming surface of the second light valve. The surface B3 is disposed opposite to each other, and the light incident surface B2 of the first light valve may be disposed opposite to the light exit surface B4 of the prism.

The first light valve 1141a outside the light incident surface B2 of the first light valve and the lens assembly 14 outside the light exit surface B4 of the prism may be respectively located on opposite sides of the prism assembly 113a in the first direction f1. The first direction f1 may be parallel to the light emitting direction f2 of the prism assembly. The light source assembly 111a outside the light incident surface B1 of the light source and the second light valve 1142a outside the light incident surface B3 of the second light valve may be located on opposite sides of the prism assembly 113a in the second direction f3, the second direction f3 and the first direction f2 is not parallel.

Under such a structure, the light source assembly 111a, the first light valve 1141a, the second light valve 1142a and the projection lens are arranged around the prism assembly 113a, which can make the structure of the optical engine more compact.

In some embodiments, as shown in FIG. 4 , the prism assembly 113a may further include a wedge prism 123, the wedge prism 123 is surrounded by a second light incident surface B7, a second light exit surface B8 and a bottom surface B9, and the second light incident surface B7 The first light-emitting surface B5 of the first prism 121 is opposite to the second light-emitting surface B8 of the second prism 122 and the first light-incident surface B6 is opposite. The wedge prism 123 can be used to compensate the optical distance.

In some embodiments, as shown in FIG. 4 , the first prism 121 can be used to receive the first incident light S1 corresponding to the first light valve 1141a through the light incident surface B1 of the light source, so as to guide the first incident light S1 to the first output light. surface B5, and reflect the first incident light S1 to the light incident surface B2 of the first light valve through the first light exit surface B5, so as to pass through the light incident surface B2 of the first light valve and enter the first light valve 1141a, and pass through the first light valve light incident surface B2 The light incident surface B2 of the light valve receives the prism exit light S3 emitted by the first light valve 1141a, and the light beam emitted by the first light valve 1141a passes through the first light exit surface B5, the second light entry surface B7, the second light exit surface B8, the second light exit surface A light-incident surface B6 and a light-emitting surface B4 of the prism are further directed toward the projection lens.

The first prism 121 can also be used to receive the second incident light S2 corresponding to the second light valve 1142a through the light incident surface B1 of the light source, so as to guide the second incident light S2 to the light incident surface B2 of the first light valve, and pass the first light The light incident surface B2 of the valve reflects the second incident light S2 to the first light exit surface B5, so as to be emitted from the first light exit surface B5, and then pass through the second light incident surface B7, the second light exit surface B8 and the second prism 122 in sequence. The first light incident surface B6 and the second prism 122 are used to guide the second incident light S2 to the light incident surface B3 of the second light valve, so as to pass through the light incident surface B3 of the second light valve to the second light valve 1142a, and pass through The light incident surface B3 of the second light valve receives the prism outgoing light S4 emitted by the second light valve 1142a, and then passes through the first light incident surface B6 of the second prism 122 to reflect the prism outgoing light S4 emitted by the second light valve 1142a to the prism outgoing light The surface B4 passes through the light-emitting surface B4 of the prism, and then emits to the projection lens.

FIG. 5 is another structural schematic diagram of the prism assembly and the light valve assembly in the optical engine shown in FIG. 3 . In some embodiments, as shown in FIG. 5 , there is an air gap between the second light incident surface B7 of the wedge prism 123 and the first light exit surface B5 of the first prism 121 . The air gap can be 3-5 microns. Since the refractive index of air can be 1, when the first incident light S1 is irradiated on the first light-emitting surface B5, the air gap can provide the first incident light S1 from light density to The light-thinning total reflection condition enables total reflection of the first incident light S1 on the first light-emitting surface B5.

Since the first incident light S1 corresponding to the first light valve 1141a can be totally reflected on the first light-emitting surface B5 of the first prism 121, the second incident light S2 corresponding to the second light valve 1142a can be reflected on the first light-emitting surface B5 of the first prism 121. Total reflection occurs on the light incident surface B2 of a light valve, and the refractive index of the first prism 121 is n1, then the critical angle θ ₁ of the first light exit surface B5 of the first prism 121 and the critical angle of the first light valve light incident surface B2 θ ₃ satisfies formula (1):

θ ₁ ＝θ ₃ ＝arcsin(1/n1) (1)

The critical angle (English: Critical angle) is the smallest angle of incidence that causes total internal reflection to occur. When light travels from an optically denser medium to an optically rarer medium, the angle of refraction will be greater than the angle of incidence; when the angle of incidence is a certain value, the angle of refraction is equal to 90°, and this angle of incidence is called the critical angle. The angle of incidence can be calculated from the normal measure of the refracting interface. For example, total internal reflection occurs when light goes from glass to air, but not when light goes from air to glass. That is, the larger the angle between the light beam and the normal line of the refracting surface, the less the light refracts, until when the angle is greater than the critical angle, total internal reflection will occur.

In some embodiments, as shown in FIG. 4 , the second light incident surface B7 of the wedge prism 123 is attached to the first light exit surface B5 of the first prism 121, and the refractive index n2 of the wedge prism 123 is smaller than that of the first prism 121. Rate n1.

The critical angle θ ₁ of the first light-emitting surface B5 of the first prism satisfies the formula (2):

θ ₁ = arcsin(n2/n1) (2)

The critical angle θ of the first light valve incident surface B2 of the first prism satisfies formula ( ₃ ):

θ ₃ = arcsin(1/n1) (3)

In some embodiments, as shown in FIG. 4 , the second light exit surface B8 of the wedge prism 123 is attached to the first light incident surface B6 of the second prism 122, and the refractive index n2 of the wedge prism 123 is smaller than that of the second prism 122. Rate n3. The prism outgoing light S4 of the second light valve 131 can be totally reflected on the first light incident surface B6 of the second prism 122 .

The critical angle θ of the _second incident surface B6 of the second prism 122 satisfies formula (4):

θ ₂ =arcsin(n2/n3) (4)

In some embodiments, as shown in FIG. 3 , the second prism 122 is an isosceles right-angle prism, and the light exit surface B4 of the prism and the light entrance surface B3 of the second light valve are perpendicular to each other, so that the second direction f3 can be parallel to the first direction f1 vertically, so that the optical paths of the light beams emitted from different regions of the first light valve 1141a are the same, thus, the optical engine can be made more compact, and thus the optical engine can be miniaturized.

In addition, the prism outgoing light S3 emitted by the first light valve 1141a and the prism outgoing light S4 emitted by the second light valve 1142a can be made to enter the projection lens in parallel, so as to improve the projection quality of the optical engine. That is, the prism assembly can make the imaging light beam emitted by the first light valve 1141a and the imaging light beam emitted by the second light valve mix and enter the projection lens, which can reduce the volume of the projection lens; the use of dual light valves in the optical engine can improve the optical efficiency. The luminous flux of the engine can increase the brightness of the light beam incident on the projection lens, thereby improving the projection quality.

As shown in FIG. 4 , the included angle α between the first light valve incident surface B2 and the first light exit surface B5 of the first prism 121 and the included angle β between the second light incident surface B7 and the second light exit surface B8 of the wedge prism 123 , and the angle ω between the first incident surface B6 of the second prism 122 and the incident surface B3 of the second light valve satisfies the following formula (5):

α+β+ω=90° (5)

Since the second prism 122 may be an isosceles right triangle, that is, ω may be 45°.

The wedge prism 123 can be used to adjust the included angle between the first prism 121 and the second prism 122. The first light valve light incident surface B2 of the first prism 121 is parallel to the prism light exit surface B4 of the second prism 122, which can make the first light valve The light beams emitted from different regions of the valve 1141a have the same optical path, thereby improving the projection quality; at the same time, the prism outgoing light S3 emitted by the first light valve 1141a and the prism outgoing light S4 emitted by the second light valve 1142a can be incident on the projection in parallel lens to improve the projection quality of the optical engine. That is, the prism assembly can make the imaging beam emitted by the first light valve and the imaging beam emitted by the second light valve mix and enter the projection lens, which can reduce the volume of the projection lens; the use of dual light valves in the optical engine can improve the optical performance. The luminous flux of the engine can increase the brightness of the light beam incident on the projection lens, thereby improving the projection quality.

In some embodiments, as shown in FIG. 4 and FIG. 5 , the included angle between the first light exit surface B5 and the light entrance surface B2 of the first light valve satisfies formula (6):

α＞90°-θ ₁ -arcsin(sin(2*θ _DMD )/n1) (6)

Wherein, _θ1 is the critical angle of the first light-emitting surface B5 of the first prism 121 . As shown in FIG. 5, when there is an air gap between the second light incident surface B7 of the wedge prism 123 and the first light exit surface B5 of the first prism 121, formula (7) is satisfied:

θ ₁ = arcsin(1/n1) (7)

As shown in FIG. 4, when the second light incident surface B7 of the wedge prism 123 is attached to the first light exit surface B5 of the first prism 121, formula (8) is satisfied:

θ ₁ = arcsin(n2/n1) (8)

The light valve may include a digital micromirror device (English: digital micromirror device, DMD for short), where θ _DMD is a deflection angle of a micromirror of the digital micromirror device. The digital micromirror device can be regarded as an optical switch composed of many micromirrors, that is, the opening and closing of the optical switch is realized by rotating the micromirrors. The number of lenses is determined by the display resolution. A small lens corresponds to a pixel. The micro-mirror is its smallest working unit and the key to its performance. Micromirrors are very small in size, but still have a complex mechanical structure different from liquid crystals. Each microreflector has an independent support frame, and deflects positively or negatively n degrees (n>0) around the hinged inclined axis. Two electrodes are arranged at the two corners of the micro-mirror, and the deflection of the micro-mirror can be controlled by voltage.

The micro-mirror works by reflecting light. When the micro-mirror is turned on (English: On State, that is, the deflection of the micro-mirror + n degrees), that is, the incident angle of the incident light (light source) reaches n degrees, and the reflection angle also Up to n degrees (the addition of the two is 2n degrees), at this time, the beam emitted by the digital micromirror device can be called On light or imaging beam, and the energy of the light that the lens can receive is the largest; if the micromirror is biased towards the off state When (English: Off State, refers to the deflection of the micromirror - n degrees), at this time, the light beam emitted by the digital micromirror device can be called Off light or non-imaging light beam, and the energy of the light received by the lens is the smallest, and the brightness is the lowest.

In this way, the first prism 121 can lead the On light (imaging light beam) of the first light valve 1141a out of the prism assembly to the lens assembly, and at the same time, it can prevent the Off light (non-imaging light beam) of the first light valve 1141a on the first light exit surface B5 After being totally reflected, it is emitted again in the first prism 121 and enters the lens assembly.

In some embodiments, the lens assembly 14 includes an incident lens, and the light exit surface B4 of the prism is perpendicular to the optical axis of the incident lens.

In summary, some embodiments of the present disclosure provide an optical engine including a light source assembly, a prism assembly, a light valve assembly, and a lens assembly. The light valve assembly includes at least two light valves. The prism assembly includes a light incident surface of a light source, a prism The light exit surface and at least two light valve light entrance surfaces corresponding to at least two light valves one-to-one, the prism assembly can receive at least two beams of incident light through one light source light incident surface, so as to guide the incident light corresponding to each light valve respectively Corresponding light valves, and can guide the light beam output by each light valve to a prism light-emitting surface, and shoot to the lens assembly, the prism assembly has a small structure, can reduce the volume of the optical engine, and can solve the problem of the size of the optical engine in the related art The problem of larger volume achieves the effect of reducing the volume of the optical engine.

Fig. 6 is a schematic structural diagram of another optical engine shown in some embodiments of the present disclosure. In some embodiments, compared with the embodiment shown in FIG. 6 and the embodiment shown in FIG. 3 , the optical engine further includes an adjustment assembly 15 and a fixing structure (not shown), at least two light valves (the first At least one light valve (the first light valve 1141 a or the second light valve 1142 a ) of the light valve 1141 a and the second light valve 1142 a ) is mounted on the adjustment assembly 15 . The adjustment assembly 15 is used to adjust the position of the image beam (prism outgoing light S3 or prism outgoing light S4) output by at least one light valve (first light valve 1141a or second light valve 1142a), and the fixing structure can be used to fix the light valve ( The position of the first light valve 1141a or the second light valve 1142a). The first light valve 1141a can be installed on the adjustment assembly 15, while the second light valve 1142a can be installed on a fixed structure, so the position of the second light valve 1142a remains unchanged. The adjustment component 15 can adjust the position of the first light valve 1141a so that the prism exit light S3 output by the first light valve 1141a output from the prism assembly 113a and the prism exit light S4 output by the second light valve 1142a are in the transverse direction and The vertical displacement is 0.5 pixel pitch.

Alternatively, the first light valve 1141a can be installed on a fixed structure, and at the same time, the second light valve 1142a can be installed on the adjustment assembly 15, then the position of the first light valve 1141a remains unchanged, and the adjustment assembly 15 can adjust the second light valve The position of 1142a is adjusted so that the image beam output from the second light valve 1142a output from the prism assembly 113a and the image beam output from the first light valve 1141a are misaligned by 0.5 pixel pitch both horizontally and vertically.

In some embodiments, at least two light valves (first light valve 1141 a and second light valve 1142 a ) are both mounted on adjustment assembly 15 . Both the first light valve 1141a and the second light valve 1142a can be installed on the adjustment assembly 15, and the adjustment assembly 15 can simultaneously adjust the positions of the first light valve 1141a and the second light valve 1142a, so that the output from the prism assembly 113a The prism outgoing light S4 output by the second light valve 1142 a and the prism outgoing light S3 output by the first light valve 1141 a are both laterally and vertically misaligned by 0.5 pixel pitch.

In the related art, the technical scheme of using a vibrating mirror to increase the imaging resolution of the optical engine is to place the vibrating mirror between the light valve and the lens assembly. When the image beams corresponding to two adjacent frames of projected images pass through the vibrating lens, Through vibration, the image beams corresponding to two adjacent frames of projection images passing through the galvanometer do not completely overlap, and the image beams corresponding to two adjacent frames of projection images are sequentially directed to the projection lens, and the lens projects the two image beams on the projection lens respectively. On the screen, two frames of projected images are superimposed on the projected screen in time-sharing and not completely overlapping, so as to improve the imaging resolution. The first frame of projection image and the second frame of projection image in two adjacent frames of projection images will be displayed on the projection screen in sequence. Since the human eye has the phenomenon of visual persistence, the first frame of projection image and the second frame of projection image can be approximated is displayed as a projected image.

In the optical engine provided by some embodiments of the present disclosure, the positions of the two light valves can be set so that the image beams output by the two light valves at the same time can be misaligned, that is, the image beams output by the two light valves can be displayed simultaneously through the lens assembly On the projection screen, dislocations are superimposed to form a projected image, which can realize the function of improving the resolution of the image screen projected by the lens assembly without setting the galvanometer; and compared with the scheme of using the galvanometer, by setting two The position of the light valve makes the two light valves one-to-one correspond to the two image beams to be misplaced and superimposed, which can improve the display effect and the frame rate of the video picture; in addition, it can also reduce the thickness of the galvanometer and the thickness of the galvanometer to the lens assembly and the galvanometer. The distance between the device and the prism assembly; and the image light beams of two light valves are exported through a prism assembly, which can simplify the structure of the optical engine, thereby realizing the effect of miniaturization of the projection device.

In some embodiments, the first light valve 1141a and the second light valve 1142a are light valves of the same size. Illustratively, both the first light valve 1141a and the second light valve 1142a are digital micromirror devices of 0.66 inches. In this way, the prism outgoing light S3 emitted by the first light valve 1141a and the prism outgoing light S4 emitted by the second light valve 1142a The size is the same, which can avoid the poor image superposition effect caused by the different sizes of the two projection beams, so that the projection effect of the optical engine can be improved by dislocation superposition.

In some embodiments, FIG. 8 is a schematic diagram of a picture projected by the optical engine provided in some embodiments of the present disclosure. As shown in FIG. 8 , P1 is the pixel position of the image beam output by the first light valve, and P2 is the pixel position of the image beam output by the second light valve. The lens assembly can be used to direct the image beams output by the first light valve and the image beams output by the second light valve to the projection screen.

In the image light beam output by the first light valve and the image light beam output by the second light valve, the pixels are arranged in an array along the horizontal f1 and the vertical f2, and the horizontal f1 may be perpendicular to the vertical f2. The image beams output by the first light valve and the image beams output by the second light valve outputted from the prism assembly 113a are misaligned by 0.5 pixel pitch in both the horizontal direction f1 and the longitudinal direction f2. For example, the light valve may include two 0.47-inch digital micromirror device light beams, and the misalignment along the horizontal/vertical direction on the prism light-emitting surface B4 of the prism assembly 113 a is 2.7 μm. Since the size of the 0.47-inch digital micromirror device is much larger than the offset of the two image beams, the offset of the beams will not affect the adjustment of the dark band.

The misalignment effect of the image beam output from the first light valve and the image beam output from the second light valve can be obtained based on a bilinear interpolation method. The bilinear interpolation method, also known as the bilinear interpolation method, is a linear interpolation extension of the interpolation function with two variables. Its core idea is to perform a linear interpolation in two directions respectively, and the image beam output by the second light valve With respect to the pixels on the image beam output by the first light valve, the pixels on the above can have two positional offsets, to the right and downward, that is, the image beam output by the first light valve is relative to the image beam output by the second light valve The offset is 0.5 pixel pitch.

The result of the linear interpolation method has nothing to do with the order of interpolation, that is, the pixels on the image beam output by the second light valve can be shifted in the f1 direction relative to the pixels on the image beam output by the first light valve, and then the f2 direction Or, first, the pixels on the image beam output by the second light valve can be offset in the f2 direction relative to the pixels on the image beam output by the first light valve, and then the offset in the f1 direction is performed, and the obtained The result is the same, that is, the pixels on the image beam output by the second light valve can be offset in the direction of the pixel diagonal relative to the pixels on the image beam output by the first light valve.

In this way, the resolution of the picture can be increased to 4 times that of a single light valve, which greatly improves the resolution of the picture. At the same time, the double light valve can increase the luminous flux of the optical-mechanical system, thereby increasing the intensity of the image beam incident on the projection lens. Brightness, which in turn can improve the display effect. For example, the physical pixels of a 0.66-inch DMD are 2716*1528, and a 4k resolution of 3840*2160 can be realized through pixel dislocation and superposition.

Fig. 7 is a schematic structural diagram of another optical engine shown in some embodiments of the present disclosure. In some embodiments, compared with the embodiment shown in FIG. 7 and the embodiment shown in FIG. 6 , the optical engine further includes a vibrating mirror 16 , and the vibrating mirror 16 may be located between the light-emitting surface B4 of the prism and the lens assembly 14 . The oscillating mirror 16 includes a driving component and a mirror surface. The driving component can be used to drive the mirror surface to vibrate at high frequency, so as to realize the dislocation projection of the image beam output by the first light valve and the image beam output by the second light valve on the light output surface B4 of the prism.

In some embodiments, the vibrating mirror 16 is used for reciprocating vibration along a first axis and a second axis, and the first axis and the second axis are perpendicular to each other. When the driving part drives the mirror along the axis of reciprocating high-frequency vibration, the more the pixel resolution of the light beam is improved. When the vibrating mirror 16 performs cyclical high-frequency vibration along the first axis and the second axis and the first axis and the second axis are perpendicular to each other, the pixel on the light beam will be deflected to the right and downward. shift.

In some embodiments, FIG. 9 is a schematic diagram of a picture projected by an optical engine provided in some embodiments of the present disclosure. As shown in FIG. 9 , P3 is the initial pixel position, and P4 is the initial pixel along the horizontal axis and the horizontal axis The vertical axis vibrates the shifted position, and the horizontal axis can be parallel to the arrangement direction of the horizontal pixel f1, so that the resolution of the picture is increased to 4 times of the original, that is, the position of the light valve can be set to make the two beams of images On the basis of the misalignment of the beams, the two image beams vibrate and shift, which can improve the resolution of the picture projected by the projection lens, so as to improve the projection display effect of the optical engine.

Some embodiments of the present disclosure provide a laser projection device. The laser projection device may include the optical engine in the above embodiments. The optical engine may include a light source assembly, a prism assembly, a light valve assembly, and a lens assembly. The optical engine has a relatively small volume. , which can make the laser projection device have a smaller volume. The light source component may include a light source unit, a collimator lens component, a uniform light component, and a reflector component.

In some embodiments, the laser projection device may further include a screen, and the screen may be used to receive the imaging light beam emitted by the light valve assembly from the prism assembly, and the image projected by the imaging light beam onto the screen is an image frame.

The light valve assembly in the laser projection device may include at least two light valves, and image beams output from the at least two light valves are shifted and superimposed. In this way, at least two image light beams emitted by the lens assembly can be superimposed with dislocations, so that the two image frames on the projection screen can be superimposed with dislocations, thereby increasing the resolution of the image frames projected by the laser projection device. At the same time, the at least two light valves can improve the brightness of the image screen projected by the laser projection device. That is, the effect of improving the resolution can be achieved without the galvanometer, thereby reducing the volume of the laser projection device.

The prism assembly can receive the illumination beams corresponding to at least two light valves through a light incident surface of a light source, and can also emit image beams emitted by at least two light valves through a light output surface of a prism, which can reduce the volume of the optical engine, thereby reducing The volume of the laser projection system.

In some embodiments, the optical engine may also include a vibrating mirror, which may be used to increase the resolution of the image frame projected by the lens assembly.

In some embodiments, the light source unit may include a first light source and a second light source, the collimator lens assembly may include a first collimator lens unit and a second collimator lens unit, and the uniform light assembly may include a first uniform light unit and a second collimator lens unit. The second uniform light unit, the reflector assembly may include a first reflector and a second reflector.

The first light source, the first collimating lens group, the first homogenizing unit and the first reflector may correspond to the first light valve in the light valve assembly to output the first incident light, the second light source, the second collimating lens The group, the second homogenizing unit and the second reflector correspond to the second light valve to output the second incident light.

The light beam emitted by the first light source can enter the first collimating lens group through the first homogenizing unit, and then be adjusted by the first collimating lens group to be directed to the first reflector. The first reflector can be placed along the optical path at an angle of 45°. The propagation direction of the light path can be deflected to reduce the volume of the optical engine. The light beam emitted by the second light source is similar to that of the first light source.

Both the first homogenizing unit and the second homogenizing unit can include a light pipe, which is a tubular device spliced by four planar reflectors, that is, a hollow light pipe, and the light is reflected multiple times inside the light pipe , to achieve the effect of light uniformity, the light guide can also be a solid light guide, the light entrance and light exit of the light guide are rectangles with the same shape and area, the light beam enters from the light entrance of the light guide, and then passes through the light exit of the light guide The mouth is directed to the light valve assembly, and the beam homogenization and spot optimization are completed during the process of passing through the light guide.

Both the first homogenizing unit and the second homogenizing unit may also include a fly-eye lens. The fly-eye lens is usually formed by combining a series of small lenses. Two rows of fly-eye lens arrays are arranged in parallel to divide the spot of the input laser beam. The follow-up focusing lens accumulates the divided light spots to achieve homogenization of the beam and optimization of the light spots.

Beam homogenization refers to transforming a beam with uneven intensity distribution into a beam with uniform cross-sectional distribution. Speckle is when a laser light source is used to illuminate a rough surface such as a screen or any other object that produces diffuse reflection or diffuse transmission, these beams interfere to form bright or dark spots, resulting in a random granular intensity pattern.

The first light source and the second light source can be laser emitters of one color, and the light beams emitted by the two light sources are emitted from corresponding light guides. Since the uniformity of the light spots of the light beams emitted by different light guides is different, so, When the two beams of light are mixed and emitted on the light-emitting surface of the prism, the uniformity of the beam can be improved, and the brightness of the optical engine can also be improved.

In some embodiments, the first light source and the second light source may also be laser emitters for emitting two colors.

The first collimating lens group may include a first spherical lens and a second spherical lens, and may also include a third spherical lens, and the second collimating lens group may include a fourth spherical lens and a fifth spherical lens, and may also include a sixth spherical lens. The lens, the above-mentioned spherical lens may also be an aspheric lens, which is not limited in some embodiments of the present disclosure.

In addition, the image beams output from the first light valve and the image beams output from the second light valve are misplaced and superimposed, so that the resolution of the image frame projected by the lens assembly can be improved without setting a vibrating mirror. Fewer structural components and smaller volume can solve the problem of more optical engine components and larger volume in the related art, and achieve the effects of simplifying the structure of the optical engine and reducing the volume of the optical engine.

In addition, the vibrating mirror is arranged between the prism assembly and the projection lens, which can increase the resolution of the picture projected by the projection lens, so as to improve the projection display effect of the optical engine.

Figure 10 is a schematic structural view of an optical engine in the related art, in some embodiments, as shown in Figure 10, the optical engine includes a light valve assembly 31a, a light source assembly 32a, a light guide 33a, a prism assembly 34a and a lens assembly 35a . The light source assembly 32a emits a light beam, and the light beam exits to the light guide 33a. The light guide 33a guides the light beam to the prism assembly 34a after processing the light beam. The prism assembly 34a receives the light beam and emits the light beam to the light valve assembly 31a. The prism assembly 34a, after the light beam is emitted from the prism assembly 34a, enters the lens assembly 35a. When the optical engine is in use, the light guide can be used to homogenize the light beam provided by the light source assembly, and at the same time shape the light beam to match the shape of the light valve assembly.

The above-mentioned optical engine is provided with only one light guide 33a, and generally, the light intensity distribution of the outgoing light beam of the light source assembly 32a is a Gaussian distribution. FIG. 11 is a schematic diagram of the light intensity distribution of the outgoing beam of the light source assembly; FIG. 12 is a purpose effect diagram of homogenizing the beam. As shown in Figure 11, it is a schematic diagram of the light intensity distribution of the outgoing beam. Within a certain beam diameter range, the light intensity distribution of the beam is different. The light intensity of the central beam is the highest, and the light intensity of the surrounding beams gradually decreases. The optical engine is uniform The purpose of the light is to make the light intensity of the central beam close to the light intensity of the surrounding beams within a certain beam diameter range. As shown in Figure 12, it is the purpose rendering of homogenization. The illuminance uniformity of the optical engine may refer to the ratio of the minimum illuminance to the average illuminance, the closer the ratio is to 1, the more uniform the illuminance. The illumination uniformity of the optical engine in the related art is about 85%. In order to improve the illuminance uniformity of the light beam after uniform light treatment, it is necessary to design an extremely long light guide, but this will result in an excessively large optical engine. Some embodiments of the present disclosure provide an optical engine and a laser projection device, which can solve some problems in the above related technologies.

Fig. 13 is a schematic structural diagram of an optical engine provided by some embodiments of the present disclosure. As shown in FIG. 13 , the optical engine includes: a light source assembly 111 a , a uniform light assembly 112 a , a prism assembly 113 a , and a light valve assembly 114 a arranged in sequence along the light path direction.

The dodging component 112a includes a first dodging component 1121a and a second dodging component 1122a, the first dodging component 1121a is used to guide the first light beam provided by the light source component 111a to the prism component 113a after dodging treatment, and the second dodging component The component 1122a is used to guide the second light beam provided by the light source component 111a to the prism component 113a after uniform light treatment, and the prism component 113a is used to guide the light beam received from the light uniform component 112a to the light valve component 114a, the first light beam and the second light beam The light beams have the same color, and the light intensity of the first light beam in the first field of view of the optical engine is smaller than the light intensity of the second light beam in the first field of view, and the light intensity of the first light beam in the second field of view of the optical engine is greater than that of the second light beam in the second field of view of the optical engine. The light intensity of the beam in the second field of view.

To sum up, some embodiments of the present disclosure provide an optical engine including a light source assembly, a dodging assembly, a prism assembly, and a light valve assembly sequentially arranged along the direction of the light path, wherein the dodging assembly includes a first dodging assembly and a second dodging assembly The light component, the first homogenizing component and the second homogenizing component are respectively used to homogenize the first light beam and the second light beam from the light source component, and then guide the homogenized light beam to the prism component. The first light beam and the second light beam have the same color, and the light intensity of the first light beam in the first field of view of the optical engine is smaller than the light intensity of the second light beam, and the light intensity of the first light beam in the second field of view of the optical engine depends on the intensity of the second beam. In this way, the light beams can be homogenized by different light uniform components, so that the light intensities of different light beams can complement each other in the same field of view, which can solve the problem of uneven illuminance of the beams processed by the light uniform components in the related art, and achieve the improvement of the optical engine. Provides the effect of illuminance uniformity of light.

Fig. 14 is a schematic diagram of a field of view of an optical engine provided by some embodiments of the present disclosure. In some embodiments, the field of view in the optical engine can be defined as a rectangular field of view, and each point within the range of the rectangle in the figure can represent a field of view. The field of view of the optical engine may include field of view (-1, 1), field of view (0, 1), field of view (1, 1), field of view (-1, 0), field of view (0, 0), There are nine different fields of view: field of view (1, 0), field of view (-1, -1), field of view (0, -1) and field of view (1, -1). Different light beams are emitted after being homogenized by the uniform light component, and the light intensities of different light beams can complement each other in the same field of view, which can make the illuminance in the field of view more uniform.

To sum up, some embodiments of the present disclosure provide an optical engine including a light source assembly, a dodging assembly, a prism assembly, and a light valve assembly sequentially arranged along the direction of the light path, wherein the dodging assembly includes a first dodging assembly and a second dodging assembly The light components, the first homogenizing component and the second homogenizing component are used to homogenize the different colored lights from the light source component, and then guide the homogenized different colored lights to the prism component, and the prism component is used to receive the light received from the homogenizing component The light beam guides the light valve, so that different color lights can be homogenized through different light dodging components, and the light dodging effect for each color light can be improved. It can solve the problem of uneven color of the light beam processed by the uniform light component in the related art, and achieve the effect of improving the chromaticity uniformity of the light provided by the optical engine.

Fig. 15 is a schematic diagram of the structural design of another optical engine provided by some embodiments of the present disclosure. In some embodiments, as shown in FIG. 15 , the optical engine includes: a light source assembly 111 a , a dodging assembly 112 a , a prism assembly 113 a and a light valve assembly 114 a sequentially arranged along the light path direction.

The light valve assembly 114a includes a first light valve 1141a and a second light valve 1142a. The light source assembly 111a guides the first light beam provided by the light source 1111a to the first uniform light assembly 1121a, and the first light uniform assembly 1121a guides the first light beam to the prism assembly 113a after being processed by the prism assembly 113a. A light valve 1141a, the first light valve 1141a is used to receive the first light beam from the prism assembly 113a and guide the prism assembly 113a through reflection, and then the first light beam is emitted through the prism assembly 113a; the light source assembly 111a receives the second light beam provided by the light source 1112 Guided to the second uniform light component 1122a, the second uniform light component 1122a conducts uniform light treatment on the second light beam, and guides it to the prism component 113a; after the second light beam is processed by the prism component 113a, it is guided to the second light valve 1142a, and the second light beam 114a The valve assembly 1142a is used to receive the second light beam from the prism assembly 113a and guide it to the prism assembly 113a through reflection, and then the second light beam is emitted through the prism assembly 113a. The first light beam and the second light beam have the same color, and the light intensity of the first light beam in the first field of view of the optical engine is smaller than the light intensity of the second light beam in the first field of view, and the first light beam is in the second field of view of the optical engine The light intensity of is greater than the light intensity of the second light beam in the second field of view.

Laser display projection technology is a technology that projects the light beam forming the picture on the screen, wall, etc., and then enters the human eye through reflection. Laser display projection technology is more obviously affected by the brightness of ambient light, so higher brightness projection products in the environment It will have a better viewing experience when used under bright light conditions (such as daytime, shopping malls). Since the luminous flux suffered by a single light valve assembly in the existing projection technology is relatively low, in order to achieve higher brightness, in some embodiments of the present disclosure, an optical engine with double light valve assemblies or multiple light valve assemblies can be used to increase the luminous flux.

Fig. 16 is a schematic diagram of a light intensity distribution of a first light beam in the embodiment shown in Fig. 15 after being homogenized; Fig. 17 is a schematic diagram of a light intensity distribution of a second light beam in the embodiment shown in Fig. 15 after being homogenized; Fig. 18 is a schematic diagram of the light intensity distribution after superposition of the light intensities of two light beams in the embodiment shown in Fig. 15 . The abscissa in Fig. 16, Fig. 17 and Fig. 18 is the beam diameter (mm), and the ordinate is the light intensity (W/cm ² ). The cross section of the light guide is rectangular, and the spot of the outgoing beam is elliptical. The solid line in Fig. 16 and Fig. 17 represents the light intensity of the short-side direction of the rectangular cross-section when the light beam is emitted from the light guide, and the dotted line represents the light intensity of the long-side direction of the rectangular cross-section when the light beam is emitted from the light guide, and in Fig. 18 The solid line represents the light intensity in the direction of the minor axis of the beam ellipse spot after superposition of the outgoing beams, and the dotted line represents the light intensity in the long axis direction of the beam ellipse spot after the superposition of the outgoing beams.

In some embodiments, the difference between the first superimposed light intensity and the second superimposed light intensity is less than a threshold. Light intensity is a physical quantity used to represent the luminous flux per unit solid angle in a given direction of the light source. The international unit is candela, symbol: cd, and the superposition method of light intensity is linear superposition. The first superimposed light intensity is the superimposed light intensity of the first light beam and the second light beam in the first field of view, and the second superimposed light intensity is the superimposed light intensity of the first light beam and the second light beam in the second field of view. The difference between the first superimposed light intensity and the second superimposed light intensity can be controlled within a preset threshold, so that the light intensities of the first field of view and the second field of view are basically the same, so that the first field of view and the second field of view The illuminance of the display is more uniform, and the illuminance of the display screen can also be more uniform, so as to avoid the situation where the display screen is not bright and dark.

In some embodiments, the aforementioned threshold is positively related to the maximum light intensity in the field of view of the optical engine. That is, the variation direction of the maximum light intensity is the same as that of the threshold value, the greater the maximum light intensity, the greater the threshold value, and the smaller the maximum light intensity, the smaller the threshold value. The maximum light intensity may be the superimposed light intensity of multiple light beams in a certain field of view in the optical engine.

In some embodiments, in any two fields of view of the optical engine, the difference between the superimposed light intensities of the first light beam and the second light beam is less than a threshold. Multiple fields of view can be divided in the optical engine, and in any two fields of view, the difference between the superimposed light intensity of the first beam and the second beam can be controlled within the preset threshold, so that The light intensity of the multiple viewing fields of the optical engine is basically the same, so that the illumination of each viewing field is more uniform, and the illumination of the display screen can also be more uniform, avoiding the situation of uneven brightness and darkness in the display screen, and improving the viewing experience.

In some embodiments, both the first light beam and the second light beam are white light beams, and the white light beams can be used for color display.

In some embodiments, both the first light beam and the second light beam are white light beams mixed with red light, blue light and green light. The light source components can be lasers of the same type, so that a white light beam mixed with red light, blue light and green light can be emitted.

In some embodiments, the first dodging component and the second dodging component are light guides with different lengths. The light pipe can be used to shape and homogenize the incident laser spot of the light source, and light pipes with different lengths have different homogenization effects on the beam. The length of the light pipe can be obtained through experiments. For example, in some embodiments of the present disclosure, the light intensity of the outgoing light after the first light beam passes through the first uniform light assembly is the same as the light intensity of the outgoing light after the second light beam passes through the second light uniform assembly. Strong can be superimposed in the field of view as shown in Figure 14. Changing the length of the first homogenizing component and the second homogenizing component, through continuous experiments, when the first beam and the second beam are homogenized by different lengths of light guides, the outgoing light can complement each other in the same field of view, then The length of different light guides, the length of the light guide at this time is the length of different light guides in some embodiments of the present disclosure. After different light beams are homogenized by light pipes of different lengths obtained through experiments, the light intensity can complement each other in the same field of view, thereby improving the uniformity of illumination of the optical engine. Beam homogenization refers to transforming a beam with uneven intensity distribution into a beam with uniform cross-sectional distribution. Laser spotting means that when a laser light source is used to illuminate a rough surface such as a screen or any other object that produces diffuse reflection or diffuse transmission, these beams form bright or dark spots, producing a random grainy pattern of intensity. In some embodiments, the optical engine provided by some embodiments of the present disclosure may have 9 fields of view.

In some embodiments, the first dodging component and the second dodging component are fly-eye lenses with different numbers of fly-eyes. The fly-eye lens can be used to shape and homogenize the incident laser spot of the light source. Fly-eye lenses with different numbers of compound eyes have different homogenization effects on light beams. The number of compound eyes of fly-eye lenses can be obtained through experiments, so that different beams can complement each other in the same field of view after being homogenized by fly-eye lenses with different numbers of compound eyes. Illumination uniformity. Beam homogenization refers to transforming a beam with uneven intensity distribution into a beam with uniform cross-sectional distribution. Laser spotting means that when a laser light source is used to illuminate a rough surface such as a screen or any other object that produces diffuse reflection or diffuse transmission, these beams form bright or dark spots, producing a random grainy pattern of intensity.

In some embodiments, the prism assembly 113a may include a first triangular prism M, a second triangular prism, and a second triangular prism N. The first triangular prism M, the second prism and the second triangular prism N are glued together with an air gap between them.

The light source assembly 111a guides the first light beam provided by the light source 1111a to the first uniform light assembly 1121a, and the first light uniform assembly 1121a guides the first light beam to the a-plane of the first triangular prism M after uniform light treatment, and the first light beam is After the b surface of a prism M undergoes total reflection, it is directed to the first light valve 1141a through the c surface of the first prism M, and the first light valve 1141a is used to receive the first light beam from the first prism M and Guide the second prism and the second triangular prism N through reflection, and then the first light beam is emitted on the f surface of the second triangular prism N; the light source assembly 111a guides the second light beam provided by the light source 1112 to the second uniform light assembly 1122a, and The second homogenizing component 1122a guides the second light beam to the first triangular prism M after homogenizing treatment, and passes through the b plane of the first triangular prism and the second triangular prism after total reflection occurs on the c plane of the first triangular prism M. The d surface of the prism N is refracted and guided to the second 114a light valve assembly 1142a, and the second 114a light valve assembly 1142a is used to receive the refracted second light beam and emit the second light beam through the e surface of the second triangular prism N , and then the second light beam is totally reflected by the d surface of the second triangular prism N and then emitted from the f surface of the second triangular prism.

The first triangular prism can be a total internal reflection prism, the second prism can be a wedge prism, and the second triangular prism can be a 45° isosceles right-angle reverse total internal reflection prism. The first triangular prism, the wedge prism and the second triangular prism can be used to separate the illuminating beam and the imaging beam in the light path, the first triangular prism is used to separate the illuminating beam and the imaging beam in the first beam path, the second three The prism is used for separating the illuminating light beam and the imaging light beam in the optical path of the second light beam, and is also used for converging the imaging light beam in the optical path of the first light beam. The prism assembly in this embodiment can combine the optical path of the first light beam and the optical path of the second light beam, effectively reducing the volume of the optical engine.

The above-mentioned first beam is totally reflected on the b-plane of the first triangular prism M, and the second beam is totally reflected on the c-plane of the first triangular prism M and the d-plane of the second triangular prism respectively. Among them, total reflection is an optical phenomenon, that is, when light passes through two media with different refractive indices, part of the light will be refracted at the interface of the medium, and the rest will be reflected. However, when the incident angle is larger than the critical angle (the light is far away from the normal), the light will stop entering the other interface, and all will be reflected inward. This phenomenon will only happen when the light enters the optically sparse medium (lower refraction) from the optically dense medium (higher refractive index medium) rate medium), when the incident angle is greater than the critical angle, because there is no refraction (the refracted light disappears) and all are reflections, it is called total internal reflection.

The occurrence of total internal reflection needs to satisfy the following formula (9):

θ is the incident angle, _θ is the critical angle, n ₁ is the refractive index of the optically denser medium, and n ₂ is the refractive index of the optically rarer medium.

In some embodiments, there may be a collimating lens assembly between the dodging assembly and the light valve assembly, and the dodging assembly and the collimating transparent assembly can homogenize the light beam in the optical engine and collimate the light beam entering the prism assembly. The collimating lens assembly may comprise a first spherical lens (or aspheric lens), a second spherical lens (or aspheric lens) or a third spherical lens (or aspheric lens) and the collimating lens assembly may be placed perpendicular to the optical axis, So as to play the role of converging light and collimating light.

In some embodiments, a diffusion wheel may be provided between the light source component and the dodging component. Laser projection equipment is more likely to produce speckle phenomenon when performing projection display. When a diffusion wheel is arranged between the light source component and the uniform light component, the laser light emitted by the light source component can become more uniform under the action of the diffusion wheel, and the laser light produced The interference of the projected image is weak, which can reduce the speckle phenomenon when the projection device is projected and displayed, avoid the projected image from being blurred, improve the display effect of the projected image, and avoid the feeling of vertigo caused by human eyes. The speckle phenomenon refers to the high coherence of the laser light source. After the different light beams emitted by the light source components are scattered when they irradiate a rough object (such as the screen of a projection device), the different light beams interfere in space, and particles appear on the screen. The phenomenon of light and dark spots. The speckle phenomenon makes the display effect of the projected image poor, and these unfocused spots that alternate between light and dark appear to the human eye in a flickering state, which is prone to dizziness when viewed for a long time, and the viewing experience of the user is poor.

To sum up, some embodiments of the present disclosure provide an optical engine including a light source assembly, a dodging assembly, a prism assembly, and a light valve assembly sequentially arranged along the light path direction, and the light valve assembly includes a first light valve and a second light valve. The light source component guides the first light beam provided by it to the first uniform light component, and the first light uniform component guides the first light beam to the prism component after uniform light processing, and the first light beam is guided to the first light valve after being totally reflected by the prism component. A light valve is used to receive the first light beam from the prism assembly and guide it to the prism assembly through reflection, and then the first light beam is refracted by the prism assembly; the light source assembly guides the second light beam provided by it to the second uniform light assembly, and the second uniform light The component guides the second light beam to the prism component after uniform light treatment, the second light beam is refracted by the prism component and then directed to the second light valve, the second light valve is used to receive the second light beam from the prism component and guide it to the prism component through reflection, and then The second light beam is emitted after being processed by the prism assembly. In this way, different light beams can be homogenized by different uniform light components for complementary light intensity, which can solve the problem of uneven illumination of beams processed by uniform light components in related technologies, and achieve the effect of uniform illumination of laser projectors. , the luminous flux of the optical engine passing through the double light valve assembly is high, which can improve the display brightness of the laser projector, so that the laser projector will have a better viewing experience when used under bright ambient light conditions.

Fig. 19 is a schematic structural diagram of another optical engine provided by some embodiments of the present disclosure. In some embodiments, as shown in FIG. 19 , the optical engine 11 includes: a light source assembly 111 a , a dodging assembly 112 a , a prism assembly 113 a and a light valve assembly 114 a sequentially arranged along the light path direction.

The first dodging component 1121a is used to homogenize the first light beam provided by the light source component 111a and guide it to the prism component 113a. The prism assembly 113a, the prism assembly 113a is used to guide the light beam received from the uniform light assembly 112a to the light valve assembly 114a, the first light beam and the second light beam have the same color, and the first light beam is in the light of the first field of view of the optical engine The intensity is smaller than the light intensity of the second light beam in the first field of view, and the light intensity of the first light beam in the second field of view of the optical engine is greater than the light intensity of the second light beam in the second field of view.

In some embodiments, the dodging component further includes a third dodging component 1123a, and the third dodging component 1123a is used to guide the third light beam provided by the light source component 111a to the prism component 113a after a dodging treatment. The difference between the third superimposed light intensity and the fourth superimposed light intensity is less than the threshold value, the third superimposed light intensity is the superimposed light intensity of the first light beam, the second light beam and the third light beam in the first field of view, and the fourth superimposed light intensity is The superimposed light intensity of the first light beam, the second light beam and the third light beam in the second viewing field. When the number of beams increases, the number of homogenization components can be increased accordingly, so that any beam can have a corresponding homogenization component for homogenization processing, and the homogenization effect can be improved.

To sum up, some embodiments of the present disclosure provide an optical engine including a light source assembly, a dodging assembly, a prism assembly, and a light valve assembly sequentially arranged along the direction of the light path, wherein the dodging assembly includes a first dodging assembly, a second dodging assembly The light component and the third uniform light component, the first uniform light component, the second uniform light component and the third uniform light component are respectively used to homogenize the first light beam, the second light beam and the third light beam from the light source component, and then Guide the homogenized light beam to the prism assembly, the prism assembly is used to guide the light beam received from the homogenization assembly to the light valve assembly, the first light beam, the second light beam and the third light beam have the same color, and the third light beam in the optical engine The difference between the superimposed light intensity and the fourth superimposed light intensity is less than the threshold, the third superimposed light intensity is the superimposed light intensity of the first light beam, the second light beam and the third light beam in the first field of view, and the fourth superimposed light intensity is the first The superimposed light intensity of the light beam, the second light beam and the third light beam in the second field of view. In this way, the light beams can be homogenized by different light uniform components, so that the light intensities of different light beams can complement each other in the same field of view, which can solve the problem of uneven illuminance of the beams processed by the light uniform components in the related art, and achieve the improvement of the optical engine. Provides the effect of illuminance uniformity of light.

Fig. 20 is a schematic structural diagram of another optical engine provided by some embodiments of the present disclosure. In some embodiments, as shown in FIG. 20 , the optical engine includes a light source assembly 111 a , a dodging assembly 112 a , a prism assembly 113 a and a light valve assembly 114 a sequentially arranged along the light path direction.

The prism assembly 113a includes a first prism assembly 1131a and a second prism assembly 1132a, the first prism assembly 1131a is used to receive the first light beam provided by the first uniform light assembly 1121a, and the second prism assembly 1132a is used to receive the second uniform light assembly 1122a The second beam provided.

The light source assembly 111a guides the first light beam provided by it to the first light uniformity assembly 1121a, and the first light uniformity assembly 1121a guides the first light beam to the first prism assembly 1131a after uniform light treatment, and the first light beam passes through the first prism assembly 1131a. After reflection, guide to the first light valve 1141a, the first light valve 1141a is used to receive the first light beam from the first prism assembly 1131a and guide it to the first prism assembly 1131a through reflection, and then the first light beam is refracted by the first prism assembly 1131a; The light source component 111a guides the second light beam provided by it to the second uniform light component 1122a, and the second light uniform component 1122a guides the second light beam to the second prism component 1132a after uniform light treatment, and the second light beam is refracted by the second prism component 1132a Then guide to the second light valve 1142a, the second light valve 1142a is used to receive the second light beam from the second prism assembly 1132a and guide it to the second prism assembly 1132a through reflection, and then the second light beam is processed by the second prism assembly 1132a and then emitted.

Fig. 21 is a schematic structural diagram of an optical engine provided by some embodiments of the present disclosure. In some embodiments, as shown in FIG. 21 , the laser projector includes a projection screen and the optical engine in any of the above-mentioned embodiments. The light source component in the optical engine may include at least one laser and a beam control component for providing a light beam to the uniform light component.

In the optical engine, the light source assembly 111a, the dodging assembly 112a, the prism assembly 113a and the light valve assembly 114a are sequentially arranged along the light path direction, and the first light beam provided by the light source assembly 111a is guided to the first dodging assembly 1121a, and the first dodging assembly 1121a Used to receive the first light beam from the light source assembly 111a, optimize the spot shape of the incident first light beam and homogenize the light beam, and guide the light beam to the first prism assembly 1131a after processing, and the first light beam passes through the first prism assembly 1131a guides to the first light valve 1141a after total reflection, and the first light valve 1141a is used to receive the first light beam from the first prism assembly 1131a and guide it to the first prism assembly 1131a through reflection, and then the first light beam is refracted by the first prism assembly 1131a guide the projection lens assembly 12a; the light source assembly 111a guides the second light beam provided by it to the second uniform light assembly 1122a, and the second uniform light assembly 1122a is used to receive the second light beam from the light source assembly 111a, and can correct the incident second light beam Optimizing the shape of the spot and homogenizing the light beam and guiding the light beam to the second prism assembly 1132a after being processed, the second light beam is refracted by the second prism assembly 1132a and then directed to the second light valve 1142a, and the second light valve 1142a is used to receive light from The second light beam of the second prism assembly 1132a is guided to the second prism assembly 1132a through reflection, and then the second light beam is processed by the second prism assembly 1132a and then directed to the projection lens assembly 12a.

In some embodiments, continuing to take FIG. 10 as an example, the outgoing light beams of the light source assembly 32a include lasers of three colors: red, green, and blue. After the three colors are superimposed and mixed, they are modulated by the optical engine and electronic devices, and the display screen is output. The color of the output beam of the light source is unchanged after being homogenized by a single light guide, so the color of the mixed light of red, green and blue depends on the ratio of the brightness of these three colors, and the brightness of these three colors in different fields of view Ratio is different, resulting in uneven chromaticity of the display screen.

Fig. 22 is a schematic diagram of the angle of the red and green mixed color light incident on the light guide in the related art; Fig. 23 is a schematic view of the angle of the blue light incident into the light guide in the related art; Fig. 24 is a schematic view of the light path of different colored lights in the light guide in the related art . In some embodiments, as shown in FIGS. 22-23 , the incident angles of the blue light and the red and green light are different from each other. As shown in FIG. 24 , the solid line represents the light path of the red and green mixed color light in the light guide, and the dotted line represents the light path of the blue light in the light guide. Due to the different incident angles of different colored lights, the light intensity distribution of the blue colored light at the light outlet position is different from the light intensity distribution of the mixed red and green colored lights after the uniform light treatment of the light guide. Due to the difference in light intensity distribution of the two color lights, the color of the display screen will be uneven, and in severe cases, the display screen will appear in a state of disordered colors. In order to make the light intensity distribution of the two color lights consistent after uniform light treatment, it is necessary to design an extremely long light guide, resulting in an excessively large optical engine, which is not conducive to the mass production and market launch of laser projection equipment.

Some embodiments of the present disclosure provide an optical engine and a projection device, which can solve some problems in the above related technologies.

In some embodiments, continuing to refer to FIG. 13 , the optical engine includes a light source assembly 111 a , a dodging assembly 112 a , a prism assembly 113 a and a light valve assembly 114 a sequentially arranged along the light path direction.

The first dodging component 1121a is used for dodging the first color light provided by the light source component 111a and guiding it to the prism component 113a, and the second dodging component 1122a is used for dodging the second color light provided by the light source component 111a The guiding prism assembly 113a is used for guiding the light beam received from the dodging assembly 112a to the light valve assembly 114a.

In some embodiments, continuing to refer to FIG. 15 , the optical engine includes a light source assembly 111 a , a dodging assembly 112 a , a prism assembly 113 a and a light valve assembly 114 a sequentially arranged along the light path direction.

The light valve assembly 114a includes a first light valve 1141a and a second light valve 1142a. The light source assembly 111a guides the first color light provided by the light source 1111a to the first dodging assembly 1121a, and the first dodging assembly 1121a guides the first color light to the prism assembly 113a after uniform light treatment, and the first color light is processed by the prism assembly 113a Rear guide first light valve 1141a, the first light valve 1141a is used to receive the first color light from prism assembly 113a and guide prism assembly 113a by reflection, then the first color light is emitted through prism assembly 113a; The provided second color light guides to the second uniform light component 1122a, and the second light uniform component 1122a guides the second color light to the prism component 113a after uniform light processing, and the second color light is guided to the second light valve 1142a after being processed by the prism component 113a, The second light valve 1142a is used to receive the second color light from the prism assembly 113a and guide the second color light to the prism assembly 113a through reflection, and then the second color light is emitted through the prism assembly 113a.

Laser display projection technology is to project the light beam forming the picture on the screen, wall, etc. and then reflect it into the human eye. It is significantly affected by the brightness of the ambient light. , shopping malls) will have a better viewing experience. Since the luminous flux of a single light valve in the existing projection technology is low, in order to achieve higher brightness, in some embodiments of the present disclosure, an optical engine with double light valves or multiple light valves may be used to increase the luminous flux.

In some embodiments, the light intensity distribution of the light emitted by the first dodging component 1121a is the same as the light intensity distribution of the light emitted by the second dodging component 1122a within a predetermined range. The first color light and the second color light enter the first uniform light component 1121a and the second light uniform component 1122a respectively, and the incident angles of the first color light and the second color light are different. The light intensity distribution of the outgoing light from the light component 1121a is the same as the light intensity distribution of the outgoing light from the second uniform light component 1122a within a predetermined range, so that the chromaticity of the two outgoing lights is more uniform.

In some embodiments, the difference between the light intensity of the first color light emitted by the first dodging component 1121a in the first viewing field and the light intensity of the second color light emitted by the second dodging component 1122a in the first viewing field is less than preset threshold. The light intensity difference between the first dodging component 1121a and the second dodging component 1122a in the first viewing field can be controlled within a preset threshold, so that the light intensities of different colored lights in the first viewing field are basically the same, Therefore, the chromaticity of the first field of view is more uniform, and the color of the display screen can be more uniform, so as to avoid the disordered state of the display screen.

In some embodiments, the first dodging component and the second dodging component are light guides with different lengths. The light pipe can be used to shape and homogenize the incident laser spot of the light source, and light pipes with different lengths have different homogenization effects on the beam. Beam homogenization refers to transforming a beam with uneven intensity distribution into a beam with uniform cross-sectional distribution. Laser spotting means that when a laser light source is used to illuminate a rough surface such as a screen or any other object that produces diffuse reflection or diffuse transmission, these beams form bright or dark spots, producing a random grainy pattern of intensity.

In some embodiments, the first color light is a mixed color light of red and green, and the second color light is blue light. The angles at which the first color light and the second color light are incident on the homogenization component are different, resulting in different intensity divisions of the first color light and the second color light emitted after being homogenized by the homogenization component, and uneven color distribution of the picture. Therefore, the use of different dodging components to process the corresponding different colored lights is conducive to better homogenization of different colored lights, so that the light intensity distribution of different colored lights after being processed by the dodging component is the same within a predetermined range.

The light source component 111a guides the first color light provided by the light source 1111a to the first uniform light component 1121a. After the light is totally reflected on the surface b of the first triangular prism M, it is directed to the first light valve 1141a through the surface c of the first triangular prism M, and the first light valve 1141a is used to receive the first light from the first triangular prism M. One color light is guided to the second prism and the second triangular prism N through reflection, and then the first color light is emitted on the f surface of the second triangular prism N; the light source assembly 111a guides the second color light provided by the light source 1112a to the second uniform The light component 1122a and the second uniform light component 1122a guide the second color light to the first triangular prism M after homogenizing treatment, and after total reflection occurs on the c plane of the first triangular prism M, it passes through the b plane of the first triangular prism The second light valve 1142a is guided to the second light valve 1142a after being refracted by the surface d of the second triangular prism N. The second light valve 1142a is used to receive the refracted second color light and pass the second color light through the e surface of the second triangular prism N Then the second color light is totally reflected by the d surface of the second triangular prism N and then emitted from the f surface of the second triangular prism N.

The first triangular prism can be a total internal reflection prism, the second prism can be a wedge-shaped prism, and the second triangular prism can be a 45 ° isosceles right-angle reverse total internal reflection prism, the first triangular prism, the wedge-shaped prism and the second triangular prism The prism can be used to separate the illuminating beam and the imaging beam in the optical path, the first prism is used to separate the illuminating beam and the imaging beam in the optical path of the first color light, and the second prism is used to separate the optical beam of the second color light The illuminating light beam and the imaging light beam are also used to combine the imaging light beam in the optical path of the first color light. The prism assembly in this embodiment can combine the light path of the first color light and the light path of the second color light, effectively reducing the volume of the optical engine.

The above-mentioned first color light is totally reflected on the b-surface of the first triangular prism M, and the second color light is totally reflected on the c-plane of the first triangular prism M and the d-plane of the second triangular prism respectively.

To sum up, some embodiments of the present disclosure provide an optical engine including a light source assembly, a dodging assembly, a prism assembly, and a light valve assembly sequentially arranged along the light path direction, and the light valve assembly includes a first light valve and a second light valve. The light source component guides the first color light provided by it to the first uniform light component, and the first uniform light component conducts uniform light treatment on the first color light to the prism component, and the first color light is guided to the first light after being totally reflected by the prism component Valve, the first light valve is used to receive the first color light from the prism assembly and guide it to the prism assembly through reflection, and then the first color light is refracted by the prism assembly; the light source assembly guides the second color light provided by it to the second uniform light assembly , the second homogenization component guides the second color light to the prism component after homogenization treatment, the second color light is refracted by the prism component and then directed to the second light valve, and the second light valve is used to receive the second color light from the prism component and reflect it Guide to the prism assembly, and then the second color light is processed by the prism assembly and then emitted. In this way, different color lights can be homogenized through different uniform light components, which can solve the problem of uneven color of the beam after being processed by the uniform light component in the related art, and achieve the effect of uniform chromaticity of the laser projection device; at the same time, through the dual The light flux of the optical engine of the light valve is high, which can increase the display brightness of the laser projection device, so that the laser projection device will have a better viewing experience when used in bright ambient light conditions (such as daytime, shopping malls).

In some embodiments, continuing to refer to FIG. 19 , the optical engine includes a light source assembly 111a, a dodging assembly 112a, a prism assembly 113a, and a light valve assembly 114a arranged in sequence along the light path direction.

The dodging component 112a further includes a third dodging component 1123a, and the third dodging component 1123a is used to guide the third color light provided by the light source component 111a to the prism component 113a after a dodging treatment. When the light source component 111a provides more than two colors and the third color light appears, the dodging component may further include a third dodging component 1123a, and the third dodging component 1123a is used to homogenize the third color light provided by the light source component 111a After processing, it is guided to the prism assembly 113a, and the prism assembly 113a receives the third color light processed by the third uniform light assembly and guides it to the light valve assembly 114a, and the light valve assembly 114a reflects the third color light to the prism assembly 113a, and the prism assembly 113a receives the light The third color light reflected by the valve assembly 114a is emitted.

In some embodiments, the light intensity distribution of the outgoing light of the third color light after being uniformly treated by the third dodging component 1123a is the same as the light intensity of the outgoing light of the first color light after being uniformly treated by the first dodging component 1121a The distribution and the light intensity distribution of the outgoing light after the second color light is homogenized by the second dodging component 1122a are the same within a predetermined range, which can make the chromaticity of the outgoing light uniform.

To sum up, some embodiments of the present disclosure provide an optical engine including a light source assembly, a dodging assembly, a prism assembly, and a light valve assembly sequentially arranged along the direction of the light path, wherein the dodging assembly includes a first dodging assembly, a second dodging assembly The light assembly and the third uniform light assembly, the first uniform light assembly, the second uniform light assembly and the third uniform light assembly are used to homogenize the different color lights from the light source assembly, and then guide the homogenized different color lights to the prism assembly , the prism component is used to guide the light beam received from the dodging component to the light valve, so that different color lights can be homogenized by different dodging components, and the dodging effect for each color light can be improved. It can solve the problem of uneven color of the light beam processed by the uniform light component in the related art, and achieve the effect of improving the chromaticity uniformity of the light provided by the optical engine.

In some embodiments, continuing to refer to FIG. 20 , the optical engine includes a light source assembly 111 a , a dodging assembly 112 a , a prism assembly 113 a and a light valve assembly 114 a sequentially arranged along the light path direction.

The prism assembly 113a includes a first prism assembly 1131a and a second prism assembly 1132a, the first prism assembly 1131a is used to receive the first color light provided by the first uniform light assembly 1121a, and the second prism assembly 1132a is used to receive the second prism assembly 1132a 1122a provides the second color light.

The light source component 111a guides the first color light provided by it to the first uniform light component 1121a, and the first light uniform component 1121a guides the first color light to the first prism component 1131a after uniform light treatment, and the first color light passes through the first prism The component 1131a is guided to the first light valve 1141a after total reflection, and the first light valve 1141a is used to receive the first color light from the first prism component 1131a and guide it to the first prism component 1131a through reflection, and then the first color light passes through the first prism The component 1131a is refracted and emitted; the light source component 111a guides the second color light provided by it to the second uniform light component 1122a, and the second uniform light component 1122a guides the second color light to the second prism component 1132a after uniform light treatment, and the second color light passes through the first The second light valve 1142a is guided to the second light valve 1142a after being refracted by the second prism assembly 1132a. The second light valve 1142a is used to receive the second color light from the second prism assembly 1132a and guide it to the second prism assembly 1132a through reflection, and then the second color light passes through the second prism assembly 1132a processed and ejected.

In some embodiments, continuing to refer to FIG. 21 , the laser projection device includes a projection lens and the optical engine in any of the above embodiments. The light source component in the optical engine may include at least one laser and a beam control component for providing beams of various colors to the uniform light component.

In the optical engine, the light source assembly 111a, the dodging assembly 112a, the prism assembly 113a and the light valve assembly 114a are sequentially arranged along the light path direction, and the first color light provided by the light source assembly 111a is guided to the first dodging assembly 1121a, and the first dodging assembly 1121a is used to receive the first color light from the light source assembly 111a, and can optimize the spot shape and beam homogenization of the incident first color light spot and guide the light beam to the first prism assembly 1131a after processing, the first color light passes through The first prism assembly 1131a guides the first light valve 1141a after total reflection, and the first light valve 1141a is used to receive the first color light from the first prism assembly 1131a and guide it to the first prism assembly 1131a through reflection, and then the first color light passes through The first prism assembly 1131a refracts and guides the projection lens 12a; the light source assembly 111a guides the second color light provided by it to the second uniform light assembly 1122a, and the second uniform light assembly 1122a is used to receive the second color light from the light source assembly 111a, and can The spot shape of the second human-colored light is optimized and the beam is homogenized, and the beam is processed and directed to the second prism assembly 1132a. The second color light is refracted by the second prism assembly 1132a and then directed to the second light valve 1142a. The second light valve 1142a is used to receive the second color light from the second prism assembly 1132a and guide it to the second prism assembly 1132a through reflection, and then the second color light is processed by the second prism assembly 1132a and directed to the projection lens 12a.

To sum up, some embodiments of the present disclosure provide an optical engine including a light source assembly, a dodging assembly, a prism assembly, and a light valve assembly sequentially arranged along the direction of the light path, wherein the dodging assembly includes a first dodging assembly and a second dodging assembly The light component, the first uniform light component and the second uniform light component are used to homogenize the received light of different colors from the light source component, and then guide the homogenized light of different colors to the prism component. The light beams received by the components are processed and guided to the light valve, so that different color lights can be homogenized by different light dodging components, and the light dodging effect for each color light can be improved. It can solve the problem of uneven color of the light beam processed by the uniform light component in the related art, and achieve the effect of improving the chromaticity uniformity of the light provided by the optical engine.

For convenience of explanation, the above description has been made in conjunction with specific implementation manners. However, the above discussion of some embodiments is not intended to be exhaustive or to limit implementations to the specific forms disclosed above. Many modifications and variations are possible in light of the above teachings. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various modified embodiments suitable for specific use considerations.

Claims

An optical engine comprising:

a light source assembly configured to provide at least two illumination beams;

a prism assembly configured to receive and reflect at least two illumination beams from the light source assembly, and also configured to receive and reflect the at least two imaging beams from the light valve assembly;

A light valve assembly, including a first light valve and a second light valve, configured to receive the at least two illumination beams from the prism assembly, modulate the at least two illumination beams, and obtain at least two imaging beams ;

a lens assembly configured to receive the at least two imaging beams from the prism assembly to synthesize a projection beam;

The prism assembly includes:

The light incident surface of the light source corresponding to the light source assembly is configured to receive the at least two illumination beams;

a first light exit surface corresponding to the first light valve and a light entrance surface of the first light valve respectively, the first light exit surface is configured to output the first illumination light beam of the at least two illumination beams, the first A light incident surface of a light valve configured to receive the first imaging light beam;

a first light-incident surface and a second light-valve light-incident surface respectively corresponding to the second light valve, the first light-incident surface is configured to output the second illumination light beam of the at least two illumination light beams, so The light incident surface of the second light valve is configured to receive the second imaging light beam; wherein, the first light exit surface is opposite to the first light incident surface;

The light exit surface of the prism corresponding to the lens assembly is configured to output the at least two imaging light beams.
The optical engine of claim 1, said prism assembly comprising a first prism and a second prism;

The first prism is surrounded by the light incident surface of the light source, the first light exit surface and the light incident surface of the first light valve;

The second prism is surrounded by the light exit surface of the prism, the first light entrance surface and the light entrance surface of the second light valve.
The optical engine of claim 2, said prism assembly further comprising a wedge prism;

The wedge-shaped prism is surrounded by the light incident surface of the second light valve, the second light exit surface and the bottom surface, the second light incident surface is set opposite to the first light exit surface of the first prism, and the second light exit surface The surface is set opposite to the first light incident surface of the second prism.
According to the optical engine of claim 3, there is an air gap between the second light incident surface of the wedge prism and the first light exit surface of the first prism.
According to the optical engine according to claim 3, the second light incident surface of the wedge prism is attached to the first light exit surface of the first prism, and the refractive index of the wedge prism is smaller than the refractive index of the first prism .
According to the optical engine according to claim 4 or 5, the second light exit surface of the wedge prism is attached to the first light incident surface of the second prism, and the refractive index of the wedge prism is smaller than that of the second prism. refractive index.
According to the optical engine described in any one of claims 3-6, the second prism is an isosceles rectangular prism, and the light exit surface of the prism and the light entrance surface of the second light valve are perpendicular to each other; the first light of the first prism The light incident surface of the valve is parallel to the prism light exit surface of the second prism.
According to the optical engine according to any one of claims 3-6, the first prism is used to receive the first illumination beam through the light incident surface of the light source, and transmit the first illumination beam through the first light exit surface. The light beam is reflected toward the light incident surface of the first light valve, so as to pass through the light incident surface of the first light valve and enter the first light valve, and receive the at least two light beams through the light incident surface of the first light valve. The first imaging beam in the imaging beam, the first imaging beam sequentially passes through the first light exit surface, the second light incident surface, the second light exit surface, the first light incident surface and the The light-emitting surface of the prism;

The first prism is also used to receive the second illumination beam through the light incident surface of the light source, and reflect the second illumination beam to the first light exit surface through the light incident surface of the first light valve, to emit from the first light exit surface, and sequentially pass through the second light incident surface, the second light exit surface and the first light incident surface of the second prism, and the second prism is used to The second illuminating light beam is guided to the light incident surface of the second light valve, so as to pass through the light incident surface of the second light valve to the second light valve, and receive the light received by the light incident surface of the second light valve. The second imaging light beam of the at least two imaging light beams is reflected to the light-emitting surface of the prism through the first light-incident surface of the second prism, so as to pass through the light-emitting surface of the prism.
According to the optical engine according to claim 1, the first imaging light beam and the second imaging light beam output from the prism assembly are superimposed in a dislocation.
According to the optical engine according to claim 9, the first imaging light beam and the second imaging light beam output from the prism assembly are superimposed with an offset of 0.5 pixel pitch in both the lateral direction and the vertical direction, and the first imaging light beam and the second imaging light beam are superimposed. In the second imaging light beam, the pixels are arranged in an array along the horizontal direction and the vertical direction.
The optical engine according to claim 1, further comprising an adjustment assembly, at least one light valve of the at least two light valves is mounted on the adjustment assembly, and the adjustment assembly is used to adjust the at least The position of the imaging beam output by a light valve.
The optical engine according to claim 11, said at least two light valves are mounted on said adjustment assembly.
The optical engine according to claim 1, further comprising a vibrating mirror, the vibrating mirror is located between the light-emitting surface of the prism and the lens assembly.
According to the optical engine according to claim 13, the oscillating mirror is used for reciprocating vibration along a first axis and a second axis, and the first axis and the second axis are perpendicular to each other.
The optical engine according to claim 1, further comprising a dodging component, the dodging component comprising:

A first uniform light component and a second uniform light component, the first uniform light component is used to guide the first light beam provided by the light source component to the prism component after uniform light treatment, and the second uniform light component is used The second light beam provided by the light source component is uniformly processed and directed to the prism component, and the prism component is used to guide the light beam received from the light uniform component to the light valve component, and the first The light beam and the second light beam have the same color, and the light intensity of the first light beam in the first field of view of the optical engine is smaller than the light intensity of the second light beam in the first field of view, and the first light beam The light intensity of a light beam in the second viewing field of the optical engine is greater than the light intensity of the second light beam in the second viewing field.
According to the optical engine of claim 15, the difference between the first superimposed light intensity and the second superimposed light intensity is less than a threshold value, and the first superimposed light intensity is the first light beam and the second light beam at the first light beam. The superimposed light intensity of a field of view, the second superimposed light intensity is the superimposed light intensity of the first light beam and the second light beam in the second field of view.
The optical engine according to claim 16, in any two fields of view of the optical engine, the difference of the superimposed light intensity of the first light beam and the second light beam is smaller than the threshold.
According to the optical engine according to claim 16, the dodging component further includes a third dodging component, and the third dodging component is used to guide the third light beam provided by the light source component to the The prism assembly, the difference between the third superimposed light intensity and the fourth superimposed light intensity is less than a threshold value, and the third superimposed light intensity is the first light beam, the second light beam and the third light beam in the first The superimposed light intensity of the field of view, the fourth superimposed light intensity is the superimposed light intensity of the first light beam, the second light beam, and the third light beam in the second field of view.
According to the optical engine according to any one of claims 16-18, the threshold is positively correlated with the maximum light intensity in the field of view of the optical engine.
According to the optical engine of claim 15, the first light beam and the second light beam are both white light beams.
According to the optical engine according to claim 17, both the first light beam and the second light beam are white light beams mixed with red light, blue light and green light.
The optical engine according to claim 1, further comprising a dodging component, the dodging component comprising: a first dodging component and a second dodging component, the first dodging component is used to provide the light source component The first color light is uniformly processed and directed to the prism assembly, and the second uniform light assembly is used to guide the second color light provided by the light source assembly to the prism assembly after uniform light processing, and the prism assembly It is used for guiding the light beam received from the uniform light assembly to the light valve assembly.
According to the optical engine according to claim 22, the light intensity distribution of the outgoing light of the first uniform light assembly is the same as the light intensity distribution of the outgoing light of the second light uniform assembly within a predetermined range.
According to the optical engine according to claim 23, the light intensity of the first color light emitted by the first uniform light component in the first viewing field is different from that of the second color light emitted by the second light uniform component in the first visual field. The difference in light intensity of the field is less than a preset threshold.
According to the optical engine according to claim 22, the first color light is red-green mixed light, and the second color light is blue light.
The optical engine according to claim 22, said light valve assembly comprising a first light valve and a second light valve, said first light valve for receiving and processing said first color light, said second light valve for receiving and processing the second color light.
According to the optical engine according to claim 22, the dodging component further includes a third dodging component, and the third dodging component is used to guide the third color light provided by the light source component to the Prism components.
The optical engine according to claim 22, the prism assembly includes a first prism assembly and a second prism assembly, the first prism assembly is used to receive the first color light provided by the first uniform light assembly, the The second prism assembly is used for receiving the second color light provided by the second uniform light assembly.
According to the optical engine according to any one of claims 15-28, the first dodging component and the second dodging component are light guides with different lengths, or, the first dodging component and the second dodging component are The uniform light component is a fly eye lens with different numbers of fly eyes.
A laser projection device, comprising the optical engine according to any one of claims 1-29.