Illumination module, LCOS display system and optical display equipment

Abstract

The embodiment of the invention provides an illumination module, an LCOS display system and optical display equipment. The illumination module comprises an illumination light source, a dodging element and an LCOS panel. The illumination light source is used for emitting illumination light; the light uniformizing element is used for diffusing and uniformizing the illumination light; the LCOS panel is used for receiving the light subjected to light homogenizing treatment and forming projection light, and then projecting and reflecting the projection light to a coupling part of an external light guide device; the optical axis of the lighting source is perpendicular to the dodging element; the dodging element is configured to be used for providing FOV required by each pixel point on the LCOS panel and deflecting and irradiating the emergent light to an effective display surface of the LCOS panel; the light transmission path of the projection light reflected by the effective display surface of the LCOS panel is located outside an area defined by connecting lines of all the edges of the light uniformizing element and the edge of the side, close to the light uniformizing element, of the LCOS panel.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of projection technology. More specifically, the embodiments of the present application relate to an illumination module, an LCOS display system and an optical display device. Background Art

[0002] As an advanced display technology, LCOS display has the advantages of high resolution, high brightness and high contrast, and has broad application prospects in optical display fields such as head-mounted display and projection display. However, the illumination part of a traditional LCOS display usually includes many optical components such as focusing lenses, relay lenses, polarization beam splitters, etc. These optical components not only increase the complexity and manufacturing cost of the illumination part, but also make it difficult to align the optical axis, resulting in a bulky illumination part, which is not conducive to application in miniaturized and lightweight optical display devices such as smart head-mounted devices. Summary of the invention

[0003] The purpose of this application is to provide a new technical solution for an illumination module, an LCOS display system and an optical display device.

[0004] In a first aspect, the present application provides an illumination module for an LCOS display system, the illumination module comprising:

[0005] An illumination light source, for emitting illumination light;

[0006] A light homogenizing element, used for diffusing and homogenizing the illumination light emitted by the illumination light source;

[0007] The LCOS panel is used to receive the light after the homogenization process and form a projection light, and then reflect the projection light to the coupling part of the light guide device of the external device;

[0008] The optical axis of the illumination light source is perpendicular to the light homogenizing element;

[0009] The light homogenizing element is configured to provide the FOV required for each pixel on the LCOS panel, and to deflect the emitted light to illuminate the effective display surface of the LCOS panel, and the optical transmission path of the projection light reflected by the effective display surface of the LCOS panel is located outside the area enclosed by the lines connecting all the edges of the light homogenizing element and the edge of the LCOS panel close to the light homogenizing element.

[0010] Optionally, the light homogenizing element and the LCOS panel satisfy the following relationship:

[0011]

[0012] Among them, p is the length of the effective display surface of the LCOS panel, l is the length of the light homogenizing element, d is the straight-line distance from the center of the light homogenizing element to the LCOS panel, FOV is the field of view angle of each pixel on the LCOS panel, θ is the angle between the central light in the FOV and the LCOS panel, and a is the inclination angle of the light homogenizing element relative to the LCOS panel.

[0013] Optionally, the light homogenizing element is arranged to be inclined relative to the LCOS panel.

[0014] Optionally, the size of the illumination light source is matched with the size of the light homogenizing element.

[0015] Optionally, the light homogenizing element is arranged parallel to the LCOS panel, and the inclination angle a is a=0°;

[0016] The light homogenizing element and the LCOS panel satisfy the following relationship:

[0017]

[0018] Optionally, the size of the light homogenizing element is larger than the size of the illumination light source.

[0019] Optionally, a diffractive optical element is provided between the illumination light source and the light homogenizing element;

[0020] The diffractive optical element is used to expand the illumination light emitted by the illumination light source and project it to the light homogenizing element.

[0021] Optionally, the diffractive optical element is arranged in parallel with the illumination light source, and the size of the diffractive optical element matches the size of the illumination light source.

[0022] In a second aspect, the present application provides an LCOS display system, the LCOS display system comprising:

[0023] The lighting module according to the first aspect; and

[0024] An optical lens and a light guide device, wherein the projection light reflected by the LCOS panel passes through the optical lens and then is projected to the coupling-in portion of the light guide device;

[0025] The light guide device is used to receive the light from the coupling-in part and transmit it to the coupling-out part for outcoupling through total reflection;

[0026] Wherein, the LCOS panel and the light guide device are arranged in parallel.

[0027] Optionally, the illumination light source, the light homogenizing element, the LCOS panel and the optical lens are all located on the same side of the light guide device, and the illumination light source, the light homogenizing element and the optical lens are located between the light guide device and the LCOS panel.

[0028] Optionally, the illumination light source and the light homogenizing element are located on one side of the light guide device, and the LCOS panel and the optical lens are located on the other side of the light guide device.

[0029] In a third aspect, the present application provides an optical display device, the optical display device comprising:

[0030] casing; and

[0031] An LCOS display system as described in the second aspect.

[0032] The beneficial effects of this application are:

[0033] The embodiment of the present application provides an illumination module, which is intended to simplify the complexity of the illumination part of the traditional LCOS display system, reduce the number and types of required optical elements, and improve the optical performance. The present application adopts a simplified optical structure, abandons the traditional complex lenses and polarization elements, and only includes three main optical components: an illumination light source, a homogenizing element, and an LCOS panel, which greatly simplifies the complexity of the illumination part and reduces the manufacturing cost; and, through the specially designed homogenizing element and the layout of the LCOS panel, not only the good homogenization of the illumination light is achieved, the energy utilization rate of the illumination light source is improved, but also the light after homogenization can uniformly cover the effective display area of ​​the LCOS panel, and the light transmission path of the projection light reflected by the LCOS panel will be completely outside the homogenizing element, so that the projection light will not pass through the homogenizing element again but can be directly incident on the imaging light path of the LCOS display system, which effectively reduces the generation of stray light, thereby providing users with a more high-quality, efficient and reliable display solution.

[0034] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0036] Figure 1 One of the structural schematic diagrams of the lighting module provided in the embodiment of the present application;

[0037] Figure 2The second structural schematic diagram of the lighting module provided in the embodiment of the present application;

[0038] Figure 3 The third structural diagram of the lighting module provided in the embodiment of the present application;

[0039] Figure 4 The fourth structural schematic diagram of the lighting module provided in the embodiment of the present application;

[0040] Figure 5 One of the design principle diagrams of the light homogenization element and the LCOS panel provided in the embodiment of the present application;

[0041] Figure 6 This is the second schematic diagram of the design of the light homogenizing element and the LCOS panel provided in the embodiment of the present application.

[0042] Description of reference numerals:

[0043] 1. Light source; 2. Light homogenization element; 3. LCOS panel; 4. Optical lens; 5. Light guide device; 6. Diffractive optical element. DETAILED DESCRIPTION

[0044] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0045] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0046] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0047] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0048] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0049] The lighting module, LCOS display system and optical display device provided in the embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0050] According to one embodiment of the present application, a lighting module is provided, wherein the lighting module is used in an LCOS display system. Figures 1 to 3 The lighting module includes an illumination light source 1, a light homogenizing element 2 and an LCOS panel 3; the illumination light source 1 is used to emit illumination light; the light homogenizing element 2 is used to diffuse and homogenize the illumination light emitted by the illumination light source 1; the LCOS panel 3 is used to receive the light after the light homogenizing process and form a projection light, and then reflect the projection light to the coupling part of the external light guide device 5; wherein the optical axis of the illumination light source 1 is perpendicular to the light homogenizing element 2; the light homogenizing element 2 is configured to provide the FOV required for each pixel on the LCOS panel 3, and deflect the emitted light to irradiate the effective display surface of the LCOS panel 3, and the optical transmission path of the projection light reflected by the effective display surface of the LCOS panel 3 is located outside the area surrounded by the line connecting all the edges of the light homogenizing element 2 and the edge of the LCOS panel 3 close to the light homogenizing element 2.

[0051] The lighting module provided in the embodiment of the present application is designed for an LCOS display system, see Figures 1 to 3 The illumination module mainly integrates three main optical components: an illumination light source 1, a light homogenizing element 2, and an LCOS panel 3. The illumination module includes a small number of optical components and a simple structure.

[0052] The illumination module provided in the embodiment of the present application is matched with the external light guide device 5, thereby reducing the volume of the entire LCOS display system. In other words, the projection light emitted by the illumination module provided in the embodiment of the present application can be transmitted to the human eye through the external light guide device 5 for imaging.

[0053] The illumination light source 1 is responsible for emitting illumination light, and the light homogenizing element 2 diffuses and homogenizes the illumination light to ensure that they can uniformly cover the effective display surface of the LCOS panel 3. The LCOS panel 3 is used to receive the illumination light after the light homogenization process, perform high-quality display, and make the illumination light form projection light with image information, and then the projection light is reflected to the light guide device 5 for light transmission, thereby realizing the projection imaging of the LCOS display system.

[0054] The illumination module provided in the embodiment of the present application includes a relatively small number of optical elements. Compared with the illumination part design of the traditional LCOS display system, the optical structure design of the illumination module provided in the embodiment of the present application is relatively simple, which helps to reduce the volume and weight of the entire illumination module and can also reduce production costs.

[0055] The illumination module provided in the embodiment of the present application can provide light for imaging display for the entire LCOS display system. The illumination module of the present application is described in detail below.

[0056] The lighting module of the embodiment of the present application includes a lighting light source 1, which is the starting part of the lighting module and is responsible for providing lighting light. This is an indispensable source of light energy in the imaging display process, and its performance directly affects the brightness and color performance of the subsequent display screen. The lighting light source 1 in the present application can be, for example, an RGB color light source to form a color image.

[0057] The lighting module of the embodiment of the present application includes a light homogenizing element 2. The light homogenizing element 2 is designed to be located between the lighting light source 1 and the LCOS panel 3. The light homogenizing element 2 is responsible for diffusing and homogenizing the lighting light emitted from the lighting light source 1. The design of the light homogenizing element 2 is the key to ensuring that the lighting light emitted by the lighting light source 1 can be uniformly and consistently irradiated to each position of the effective display surface of the LCOS panel 3, which is directly related to the uniformity and clarity of the displayed image. At the same time, the light homogenizing element 2 also provides the FOV required for each pixel on the LCOS panel 3. It should be noted that the LCOS panel 3 mainly has a reflection function, and its FOV is designed by the light homogenizing element 2. In other words, the light homogenizing element 2 can provide the divergence angle FOV required for the entire lighting module.

[0058] The lighting module provided in the embodiment of the present application is shown in FIG. Figure 1 , the optical transmission path of the projection light reflected by the effective display surface of the LCOS panel 3 is located outside the area surrounded by the line connecting all the edges of the light homogenizing element 2 and the edge of the LCOS panel 3 on one side close to the light homogenizing element 2. In this way, the projection light reflected by the effective display surface of the LCOS panel 3 will not pass through the light homogenizing element 2 again, that is, the light homogenizing element 2 will not block the projection light reflected by the effective display surface of the LCOS panel 3, so that the light coupled into the light guide device 5 can be prevented from forming stray light and affecting the quality of the final projection imaging.

[0059] The light homogenizing element 2 is, for example, a light homogenizing sheet.

[0060] The surface of the light homogenizer is covered with microlens structures, which give the light homogenizer unique light homogenization and diffusion properties. Specifically, when light is incident on the light homogenizer, these microlenses will split the incident light and divide a beam of light into multiple small beams. Each microlens projects the part of the light that shines on it as a light spot with relatively uniform energy distribution. Due to the refraction of the microlens, the light spot generated by each microlens will diffuse to a certain extent in space. This diffusion helps to distribute the originally concentrated light energy to a wider area. The light spots generated by multiple microlenses on the light homogenizer will be superimposed in the far field or focal plane. Due to the arrangement and optical properties of the microlens array, these light spots can compensate each other during the superposition process, making the light intensity distribution of the entire illumination area more uniform.

[0061] The lighting module of the embodiment of the present application includes an LCOS panel 3. The LCOS panel 3 is the main component of the entire lighting module, which is responsible for receiving the illumination light after the uniform light treatment and forming an imaging light with image information to continue to the rear optical element, such as Figure 1 The performance of the LCOS panel 3 will also affect the quality of the displayed image.

[0062] Compared with the prior art, the present application abandons complex optical elements such as lenses and polarization elements, and adopts a simpler optical device - the light homogenizing element 2. By carefully designing the light homogenizing element 2, it can effectively homogenize the illumination light emitted by the illumination light source 1, and guide the light to be projected onto the LCOS panel 3 at an appropriate angle, and evenly and comprehensively cover the effective display surface of the LCOS panel 3. In other words, the illumination module provided in the embodiment of the present application is intended to simplify the complexity of the illumination part of the traditional LCOS display system, reduce the number and types of required optical elements, and improve the optical performance.

[0063] In the prior art, the light emitted by the illumination light source is usually focused vertically on the LCOS panel.

[0064] However, in the solution proposed in the embodiment of the present application, Figures 1 to 3 As shown, a new design is adopted, that is, the illumination light is projected onto the LCOS panel 3 at an inclined angle. This design is conducive to simplifying the structural design complexity of the light homogenizing element 2.

[0065] Specifically, when the illumination light is irradiated to the LCOS panel 3 in an oblique manner, it also means that the light received by the light homogenizing element 2 is also oblique. Therefore, when designing the light homogenizing element 2, it is only necessary to focus on whether it can evenly diffuse the light forward and ensure that the light can cover the entire LCOS panel 3. Such a design greatly simplifies the design task of the light homogenizing element 2, because it only needs to achieve the light homogenizing effect.

[0066] On the contrary, if the illumination light is projected vertically onto the LCOS panel 3, the design of the light homogenizing element 2 will be more complicated. It not only needs to achieve uniform diffusion of light, but also must ensure that the light can be properly deflected to cover the entire LCOS panel. This additional deflection requirement will increase the design difficulty and manufacturing cost of the light homogenizing element 2. Therefore, the oblique projection design proposed in this application is a more efficient and economical solution.

[0067] In some examples of the present application, the light homogenizing element 2 and the LCOS panel 3 satisfy the following relationship:

[0068]

[0069] Among them, p is the length of the effective display surface of the LCOS panel 3, l is the length of the light homogenizing element 2, d is the straight-line distance from the center of the light homogenizing element 2 to the LCOS panel 3, FOV is the field of view angle of each pixel point on the LCOS panel 3, θ is the angle between the central light in the FOV and the LCOS panel 3, and a is the inclination angle of the light homogenizing element 2 relative to the LCOS panel 3.

[0070] See also Figure 5 As shown, Figure 5 It is shown that when the light homogenizing element 2 is tilted relative to the LCOS panel 3, the design of the light homogenizing element 2 is specifically analyzed as follows.

[0071] In the design of the lighting module provided in the embodiment of the present application, see Figure 5The design between the light homogenizing element 2 and the LCOS panel 3 is particularly critical, and they satisfy a specific relationship, which comprehensively considers the effective display surface length p of the LCOS panel 3, the length l of the light homogenizing element 2, the straight-line distance d from the center of the light homogenizing element 2 to the LCOS panel 3, the field of view angle FOV of each pixel on the LCOS panel 3, the angle θ between the central light in the FOV and the LCOS panel 3, and the inclination angle a of the light homogenizing element 2 relative to the LCOS panel 3. This relationship ensures that the illumination light emitted from the illumination light source 1 can be uniformly and consistently irradiated to each position of the effective display surface of the LCOS panel 3 after passing through the light homogenizing element 2, under the premise of meeting certain uniformity and angle requirements, which greatly improves the uniformity of the distribution of the illumination light on the LCOS panel 3, especially on its effective display surface, and avoids the undesirable phenomena such as brightness difference or dark corners of the final image formed due to uneven distribution of the illumination light.

[0072] Since the illumination light can evenly cover the LCOS panel 3, the light signal received by the LCOS panel 3 will be more stable, which helps to improve the uniformity and clarity of the displayed image. At the same time, the improvement of the uniformity of the illumination light also helps to reduce image distortion and color distortion, and further optimize the display performance.

[0073] The design of the above relationship allows the uniform distribution of light between the light homogenizing element 2 and the LCOS panel 3 in a relatively simple and efficient manner without introducing additional complex optical elements. This helps to reduce the complexity of the entire lighting module, simplify the system structure, and reduce manufacturing costs.

[0074] The lighting module provided in the embodiment of the present application, when used in an LCOS display system, reduces display defects and improves the display quality of the entire system and the user's visual experience. In general, the lighting module of the present application brings a double improvement in light uniformity and display quality to the LCOS display system.

[0075] When the FOV and p in the relationship provided in this example of the present application are fixed, and the sizes of θ and α are fixed, if l is to be smaller, the size of d needs to be reduced. When the value of d decreases, it means that the distance between the light homogenizing element 2 and the LCOS panel 3 is shortened.

[0076] In this example, see Figure 5 The length direction of the light homogenizing element 2 and the length direction of the effective display surface of the LCOS panel 3 are both Figure 5 The horizontal direction is shown in FIG.

[0077] It should be noted that the light homogenizing element 2 and the LCOS panel 3 have a width direction in addition to a length direction. Here, the restriction conditions in the width direction are consistent with the restriction conditions in the length direction, that is, both need to follow the same constraint principles in design and application.

[0078] In the lighting module of the present application, the design of the light homogenizing element 2 not only ensures the uniform distribution of light, but also improves the energy utilization of the lighting light source 1. This means that under the same lighting conditions, the lighting module of the embodiment of the present application can more effectively utilize the light energy emitted by the lighting light source 1, thereby reducing light energy loss.

[0079] Due to the improvement in light uniformity and light source energy utilization, the lighting module of the embodiment of the present application has an excellent performance in display image quality. It can present clearer, more delicate and colorful images or information, bringing users a better visual experience.

[0080] The present application adopts a simplified optical structure, abandons the traditional complex lenses and polarization elements, and only includes an illumination light source 1, a light homogenizing element 2 and an LCOS panel 3, which greatly simplifies the complexity of the illumination part and reduces the manufacturing cost; at the same time, through the light homogenizing element 2, the illumination light is homogenized, the energy utilization rate of the illumination light source is improved, and the optical performance of the LCOS display system can be improved, providing users with a better quality, more efficient and reliable display solution.

[0081] Based on the above description of the composition of the lighting module provided by the present application, it can be determined that compared with the lighting system design of the traditional LCOS display, the lighting module provided by the present application greatly simplifies the structural design. By reducing unnecessary optical devices and components, the entire lighting module not only reduces the manufacturing cost, but also improves the assembly efficiency and reliability.

[0082] In some examples of this application, see Figure 1 The light homogenizing element 2 is arranged at an angle relative to the LCOS panel 3 .

[0083] See also Figure 1 When the light homogenizing element 2 is tilted, it can guide the illumination light to the LCOS panel 3 at a flexible angle. This tilt angle helps the light to be more evenly distributed on the LCOS panel 3, avoiding the phenomenon of bright center and dark edge caused by vertical incidence of light.

[0084] In the lighting module provided in the embodiment of the present application, see Figure 1, the light homogenizing element 2 is designed to be tilted relative to the LCOS panel 3, which can simplify the design of the light homogenizing element 2. Compared with the vertical setting, the light homogenizing element 2 set obliquely is simpler in design. It does not need to consider how to deflect the vertically incident light to cover the entire LCOS panel 3, but only needs to focus on the uniform diffusion of the light in the tilted direction. This simplification reduces the manufacturing difficulty and cost of the light homogenizing element 2, and also helps to improve production efficiency.

[0085] In some examples of this application, see Figure 1 The size of the illumination light source 1 is matched with the size of the light homogenizing element 2.

[0086] When the light homogenizing element 2 is tilted relative to the LCOS panel 3 , and the illumination light source 1 is kept parallel to the light homogenizing element 2 , the size of the illumination light source 1 is designed to match the size of the light homogenizing element 2 .

[0087] The design of matching the size of the illumination light source 1 with the light homogenizing element 2 ensures that the light emitted by the illumination light source 1 can be received by the light homogenizing element 2 to the maximum extent. Since the sizes of the two are matched, light will not leak or lose light during transmission due to size mismatch, thereby improving the efficiency of light energy transmission. This efficient light energy transmission helps to enhance the light intensity received by the LCOS panel 3, thereby improving the brightness and clarity of the displayed image.

[0088] This example of the present application can optimize the uniformity of the illumination light. Specifically, the combination of the illumination light source 1 and the light homogenizing element 2 of matching sizes helps to achieve a more uniform light distribution, and the light homogenizing element 2 can more effectively diffuse and homogenize the light from the illumination light source 1, ensuring that the light can be uniformly and consistently irradiated to each position of the effective light-emitting surface of the LCOS panel 3.

[0089] In addition, the design of matching size simplifies the structure of the lighting module. Specifically, since the lighting source 1 and the light homogenizing element 2 are of the same size, the positioning between the two becomes simpler. This not only reduces the manufacturing cost, but also improves the assembly efficiency, making the entire lighting module more compact and reliable.

[0090] Although the sizes of the illumination light source 1 and the light homogenizing element 2 are matched in this example of the present application, this design does not limit the flexibility of the system. In practical applications, the sizes of the illumination light source 1 and the light homogenizing element 2 can be adjusted as needed to meet the requirements of LCOS display systems of different specifications and performances.

[0091] For example, for a display system that requires higher brightness or a larger illumination range, the size of the illumination light source 1 and the light homogenizing element 2 can be increased. Conversely, for miniaturized and lightweight application scenarios, the size can be reduced to adapt to space limitations.

[0092] In some examples of this application, see Figure 2 and Figure 6 , the light homogenizing element 2 and the LCOS panel 3 are arranged in parallel, and the inclination angle a is a=0°;

[0093] The light homogenizing element 2 and the LCOS panel 3 satisfy the following relationship:

[0094]

[0095] In this example of the present application, see Figure 2 The light homogenizing element 2 and the LCOS panel 3 are arranged in parallel. Figure 1 Compared with the optical structure shown, the height of the entire lighting module has been significantly reduced through parallel arrangement, which improves the compactness and integration of the lighting module. This design shows significant advantages in optical applications that pursue miniaturization and high efficiency.

[0096] In the relationship provided in this example of the present application: Figure 6 , p is the length of the effective display surface of the LCOS panel 3, l is the length of the light homogenizing element 2, d is the straight-line distance from the center of the light homogenizing element 2 to the LCOS panel 3, FOV is the field of view angle of each pixel on the LCOS panel 3, and θ is the angle between the central light in the FOV and the LCOS panel 3.

[0097] According to the design scheme provided in this example of the present application, it is ensured that the light can be evenly distributed before entering the LCOS panel 3, effectively reducing the problem of uneven brightness and improving the efficiency of light utilization. By controlling the distance and angle relationship between the light homogenizing element 2 and the LCOS panel 3, the clarity of the displayed image is significantly improved. In addition, parallel setting and angle control help reduce optical distortion caused by improper position or angle deviation of optical elements, thereby providing more accurate image display.

[0098] According to the relationship provided in this example of the present application, when the length dimension p of the FOV and the LCOS is fixed, and the size of the angle θ is fixed, if l is to be smaller, the size of d needs to be reduced.

[0099] In the lighting module provided in the embodiment of the present application, see Figure 6If the projection light reflected by the edge of the LCOS panel 3 is not allowed to pass through the light homogenizing element 2, it is necessary to satisfy: p≤d / tan(θ+FOV / 2); wherein p is the length of the effective display surface of the LCOS panel 3, d is the straight-line distance from the center of the light homogenizing element 2 to the LCOS panel 3, FOV is the field of view of each pixel on the LCOS panel 3, and θ is the angle between the central light in the FOV and the LCOS panel 3. According to this example, interference with imaging can be avoided, such as reducing the formation of stray light.

[0100] In some examples of this application, see Figure 2 , the size of the light homogenizing element 2 is larger than the size of the illumination light source 1.

[0101] In this example of the present application, the size of the light homogenizing element 2 being larger than the size of the illumination light source 1 means that the area of ​​the light homogenizing element 2 is larger than the light emitting area of ​​the illumination light source 1 .

[0102] See also Figure 2 , both the illumination light source 1 and the light homogenizing element 2 are arranged in parallel with the LCOS panel 3; wherein the area of ​​the illumination light source 1 is smaller than the light emitting area of ​​the light homogenizing element 2. Such a design allows the size of the illumination light source 1 to be reduced to a certain extent, while still ensuring that the light processed by the light homogenizing element 2 can be evenly covered on the LCOS panel 3.

[0103] In this example of the present application, the uniform light angle of the uniform light element 2 can form a set deflection angle relative to the light emission direction of the illumination light source 1 to ensure that the uniform light processed illumination light can more evenly cover the LCOS panel 3 and reduce the dead angle problem that the illumination light cannot reach.

[0104] In some examples of this application, see Figure 3 A diffractive optical element 6 is provided between the illumination light source 1 and the light homogenizing element 2 ; the diffractive optical element 6 is used for expanding the illumination light emitted by the illumination light source 1 and projecting it to the light homogenizing element 2 .

[0105] exist Figure 2 Based on the lighting module architecture shown, another example of this application is shown in Figure 3 When the light emitting area of ​​the illumination light source 1 is relatively small, which may affect the uniformity of the light, a diffractive optical element 6 is introduced in this example of the present application.

[0106] The addition of the diffractive optical element 6 greatly enhances the uniform distribution and diffusion effect of the illumination light, and any corner of the LCOS panel 3 can receive uniform and consistent light intensity. This improvement not only significantly improves the image quality of the illumination module based on the LCOS display, but also effectively reduces the uneven brightness and light spot defects that may appear in the picture, bringing a clearer and brighter visual experience to users.

[0107] In some examples of this application, see Figure 3 The diffractive optical element 6 is arranged in parallel with the illumination light source 1 , and the size of the diffractive optical element 6 matches the size of the illumination light source 1 .

[0108] See also Figure 3 In this example of the present application, it is described that the introduced diffractive optical element 6 is arranged in parallel with the illumination light source 1, and the area thereof matches the light emitting area of ​​the illumination light source 1. The diffractive optical element 6 is mainly used to expand the illumination light emitted by the illumination light source 1 to ensure that the size of the light beam incident on the homogenizing element 2 matches the homogenizing requirement.

[0109] The introduction of the diffractive optical element 6 can perform a beam expansion process on the illumination light, so that the size of the light beam incident on the light homogenizing element 2 is more in line with the light homogenization requirement, thereby improving the utilization rate and uniformity of the light.

[0110] In addition, the parallel arrangement and size matching of the diffractive optical element 6 and the illumination light source 1 reduce the difficulty of manufacturing and assembling and improve the production efficiency.

[0111] In some examples of this application, see Figures 1 to 3 , the optical axis of the illumination light source 1 is perpendicular to the light homogenizing element 2 .

[0112] In this application, see Figures 1 to 3 The illumination light source 1 and the light homogenizing element 2 are arranged parallel to each other. This layout enables the illumination light to be directly and efficiently projected onto the light homogenizing element 2 after being emitted from the illumination light source 1 without complicated turning or adjustment.

[0113] Since the illumination light source 1 and the light homogenizing element 2 are arranged in parallel with each other, the optical path design is simplified. Specifically, unnecessary refraction and reflection are reduced during the propagation of the illumination light, which reduces light loss and improves light energy utilization.

[0114] The parallel arrangement also helps to improve the uniformity of the light. Specifically, the light homogenizing element 2 can more effectively diffuse and homogenize the parallel incident light, ensuring that the light can uniformly cover all positions on the LCOS panel 3, thereby forming uniform imaging light.

[0115] In addition, the parallel arrangement of the structure is more convenient in the manufacturing and assembly process. For example, the positioning and alignment between the components are relatively easy, which reduces the production difficulty and cost.

[0116] It should be noted that when the lighting module of the present application is applied in, for example, an LCOS display system, see Figures 1 to 3 The illumination module can be located as a whole on one side of the light guide device 5 in the LCOS display system. Of course, the illumination module can also be located on both sides of the light guide device 5. Figure 4 , as the illumination light source 1 and the light homogenizing element 2 are arranged on one side of the light guide device 5 , and the LCOS panel 3 is arranged on the other side of the light guide device 5 .

[0117] According to another embodiment of the present application, an LCOS display system is provided. Figures 1 to 4 The LCOS display system includes the lighting module as described above, as well as an optical lens 4 and a light guide device 5; the projection light reflected by the LCOS panel 3 is projected onto the coupling-in part of the light guide device 5 after passing through the optical lens 4; the light guide device 5 is used to receive the light from the coupling-in part and transmit it to the coupling-out part for total reflection; the LCOS panel 3 and the light guide device 5 are arranged in parallel.

[0118] In the LCOS display system of the present application, the optical lens 4 is located on the reflection path of the LCOS panel 3, and the optical lens 4 is used to focus, correct, and perform other processing on the image light emitted by the LCOS panel 3 to ensure image quality.

[0119] The optical lens 4 may include, for example, one or more lenses. The specific number of lenses may be flexibly adjusted according to the requirements of imaging quality, and this is not limited in the present application.

[0120] The light guide device 5 is located on the light output path of the optical lens 4. The addition of the light guide device 5 enables the LCOS display system of the present application to better manage light, reduce light loss, and improve light utilization. The light guide device 5 can transmit light with image information to the human eye to form an imaging picture in the human eye.

[0121] In the LCOS display system provided in the embodiment of the present application, the light guiding device 5 is, for example, a diffraction light waveguide plate, and a coupling-in part and a coupling-out part are provided on the diffraction light waveguide plate. The light with image information emitted from the optical lens 4 is propagated through the coupling-in part to the inside of the diffraction light waveguide plate, and is coupled out to the human eye for imaging after encountering the coupling-out part.

[0122] Please continue to see Figures 1 to 4 , the light guide device 5 and the LCOS panel 3 are designed to be arranged in parallel. This design method helps to simplify the overall structure of the lighting module, making the spatial relationship between the various optical components clearer and more compact. At the same time, the parallel arrangement can also reduce problems such as light loss or image distortion caused by angle deviation between components.

[0123] This design helps improve the overall performance of the system by reducing problems such as light loss or image distortion caused by angle deviation, making the final displayed image more accurate and clear.

[0124] In addition, the parallel arrangement of the light guide device 5 and the LCOS panel 3 greatly simplifies the overall structure of the lighting module, making the assembly process of the lighting module more convenient.

[0125] In some examples of this application, see Figures 1 to 3 The illumination light source 1, the light homogenizing element 2, the LCOS panel 3 and the optical lens 4 are all located on the same side of the light guide device 5, and the illumination light source 1, the light homogenizing element 2 and the optical lens 4 are located between the light guide device 5 and the LCOS panel 3.

[0126] See also Figures 1 to 3 The optical structure layout shown: the illumination light source 1, the light homogenizing element 2 and the optical lens 4 (possibly also a diffractive optical element 6, see Figure 3 ) is arranged in the space between the light guide device 5 and the LCOS panel 3. Such a layout design means that after the light is emitted from the illumination light source 1, it is first homogenized by the light homogenizing element 2 and then projected to the LCOS panel 3. The LCOS panel 3 can reflect the light to the optical lens 4, and then focus and correct it through the optical lens 4, and finally enter the light guide device 5 for further light adjustment or guidance, and finally guide the processed image light to the user's eyes or other target areas. This layout ensures that every link from light generation to output is effectively controlled and optimized, thereby improving the utilization rate of light and image quality.

[0127] This layout design in this example of the present application improves the integration of the entire lighting module, making the connection between various components closer and more efficient.

[0128] In some examples of this application, see Figure 4 The illumination light source 1 and the light homogenizing element 2 are located on one side of the light guide device 5 , and the LCOS panel 3 and the optical lens 4 are located on the other side of the light guide device 5 .

[0129] By placing the illumination light source 1 and the light homogenizing element 2 , the LCOS panel 3 and the optical lens 4 on two opposite sides of the light guide device 5 , respectively, this layout design effectively utilizes the space on both sides of the light guide device 5 .

[0130] The illumination light source will generate a certain amount of heat during operation. In the example of the present application, by placing the illumination light source 1 on one side of the light guide device 5, heat dissipation design can be more easily achieved.

[0131] Please continue to see Figure 4 The illumination light source 1 and the light homogenizing element 2, as well as the LCOS panel 3 and the optical lens 4 are all parallel to the light guide device 5. Such a parallel arrangement simplifies the structural layout of the entire illumination module and reduces the complexity of manufacturing and assembly.

[0132] The following four embodiments are used to respectively describe the layout of the lighting module provided in the embodiments of the present application in the LCOS display system.

[0133] Example 1

[0134] See also Figure 1 , the LCOS display system includes an illumination module, an optical lens 4 and a light guide device 5;

[0135] The lighting module comprises an illumination light source 1, a light homogenizing element 2 and an LCOS panel 3 which are sequentially arranged along an optical path; the illumination light source 1 is used to provide illumination light; the light homogenizing element 2 is used to diffuse and homogenize the illumination light, and enables the illumination light to be deflected and irradiated to the LCOS panel 3 and cover its effective display surface, and at the same time can provide the field of view angle FOV required for the LCOS panel 3 to reflect the light; the illumination light is obliquely projected onto the LCOS panel 3; the LCOS panel 3 is used to receive the illumination light after the light homogenization process for display to form projection light, and the projection light reflected by the LCOS panel 3 no longer passes through the light homogenizing element 2 when propagating to the optical lens 4;

[0136] The light homogenizing element 2 is arranged obliquely relative to the LCOS panel 3, and the light homogenizing element 2 and the LCOS panel 3 have the following relationship:

[0137]

[0138] Wherein, p is the length of the effective display surface of the LCOS panel 3, l is the length of the light homogenizing element 2, d is the straight-line distance from the center of the light homogenizing element 2 to the LCOS panel 3, FOV is the field of view angle of each pixel on the LCOS panel 3, θ is the angle between the central light in the FOV and the LCOS panel 3, and a is the inclination angle of the light homogenizing element 2 relative to the LCOS panel 3;

[0139] The optical lens 4 is located on the reflection path of the LCOS panel 3, the light guide device 5 is located on the light exit side of the optical lens 4, and the light guide device 5 and the LCOS panel 3 are arranged in parallel;

[0140] The illumination light source 1 , the light homogenizing element 2 and the optical lens 4 are located between the light guide device 5 and the LCOS panel 3 .

[0141] Example 2

[0142] See also Figure 2 , the LCOS display system includes an illumination module, an optical lens 4 and a light guide device 5;

[0143] The lighting module comprises an illumination light source 1, a light homogenizing element 2 and an LCOS panel 3 which are sequentially arranged along an optical path; the illumination light source 1 is used to provide illumination light; the light homogenizing element 2 is used to diffuse and homogenize the illumination light, and enables the illumination light to be deflected and irradiated to the LCOS panel 3 and cover its effective display surface, and at the same time can provide the field of view angle FOV required for the LCOS panel 3 to reflect the light; the illumination light is obliquely projected onto the LCOS panel 3; the LCOS panel 3 is used to receive the illumination light after the light homogenization process for display to form projection light, and the projection light reflected by the LCOS panel 3 no longer passes through the light homogenizing element 2 when propagating to the optical lens 4;

[0144] The light homogenizing element 2 and the LCOS panel 3 are arranged in parallel, and the light homogenizing element 2 and the LCOS panel 3 satisfy the following relationship:

[0145]

[0146] Wherein, p is the length of the effective display surface of the LCOS panel 3, l is the length of the light homogenizing element 2, d is the straight-line distance from the center of the light homogenizing element 2 to the LCOS panel 3, FOV is the field of view angle of each pixel on the LCOS panel 3, and θ is the angle between the central light in the FOV and the LCOS panel 3;

[0147] The optical lens 4 is located on the reflection path of the LCOS panel 3, the light guide device 5 is located on the light exit side of the optical lens 4, and the light guide device 5 and the LCOS panel 3 are arranged in parallel;

[0148] The illumination light source 1 , the light homogenizing element 2 and the optical lens 4 are located between the light guide device 5 and the LCOS panel 3 .

[0149] Example 3

[0150] See also Figure 3 , the LCOS display system includes an illumination module, an optical lens 4 and a light guide device 5;

[0151] The lighting module comprises an illumination light source 1, a light homogenizing element 2 and an LCOS panel 3 which are sequentially arranged along the optical path; the illumination light source 1 is used to provide illumination light; the light homogenizing element 2 is used to diffuse and homogenize the illumination light, and enables the illumination light to be deflected and irradiated to the LCOS panel 3 and cover its effective display surface, and at the same time can provide the field of view angle FOV required for the LCOS panel 3 to reflect the light; the illumination light is obliquely projected onto the LCOS panel 3; the LCOS panel 3 is used to receive the illumination light after the light homogenization process for display to form projection light, and the projection light reflected by the LCOS panel 3 no longer passes through the light homogenizing element 2 when propagating to the optical lens 4;

[0152] The light homogenizing element 2 and the LCOS panel 3 are arranged in parallel, and the light homogenizing element 2 and the LCOS panel 3 satisfy the following relationship:

[0153]

[0154] Wherein, p is the length of the effective display surface of the LCOS panel 3, l is the length of the light homogenizing element 2, d is the straight-line distance from the center of the light homogenizing element 2 to the LCOS panel 3, FOV is the field of view angle of each pixel on the LCOS panel 3, and θ is the angle between the central light in the FOV and the LCOS panel 3;

[0155] Furthermore, a diffractive optical element 6 is arranged in parallel between the illumination light source 1 and the light homogenizing element 2. The size of the diffractive optical element 6 matches the size of the illumination light source 1. The diffractive optical element 6 is used to perform beam expansion processing on the illumination light emitted by the illumination light source 1 to ensure that the size of the light beam incident on the light homogenizing element 2 matches the light homogenization requirement.

[0156] The optical lens 4 is located on the reflection path of the LCOS panel 3, the light guide device 5 is located on the light exit side of the optical lens 4, and the light guide device 5 and the LCOS panel 3 are arranged in parallel;

[0157] The illumination light source 1 , the light homogenizing element 2 and the optical lens 4 are located between the light guide device 5 and the LCOS panel 3 .

[0158] Example 4

[0159] See also Figure 4 , the LCOS display system includes an illumination module, an optical lens 4 and a light guide device 5;

[0160] The lighting module includes an illumination light source 1, a light homogenizing element 2 and an LCOS panel 3; the illumination light source 1 is used to provide illumination light; the light homogenizing element 2 is used to diffuse and homogenize the illumination light, and enables the illumination light to be deflected and irradiated to the LCOS panel 3 and cover its effective display surface, and at the same time can provide the field of view angle FOV required for the LCOS panel 3 to reflect the light; the illumination light is obliquely projected onto the LCOS panel 3; the LCOS panel 3 is used to receive the illumination light after the light homogenization process for display to form a projection light, and the projection light reflected by the LCOS panel 3 no longer passes through the light homogenizing element 2 when propagating to the optical lens 4;

[0161] The light homogenizing element 2 and the LCOS panel 3 are arranged in parallel, and the light homogenizing element 2 and the LCOS panel 3 satisfy the following relationship:

[0162]

[0163] Wherein, p is the length of the effective display surface of the LCOS panel 3, l is the length of the light homogenizing element 2, d is the straight-line distance from the center of the light homogenizing element 2 to the LCOS panel 3, FOV is the field of view angle of each pixel on the LCOS panel 3, and θ is the angle between the central light in the FOV and the LCOS panel 3;

[0164] The illumination light source 1 and the light homogenizing element 2 are arranged in parallel and are located on one side of the light guide device 5, and the optical lens 4 and the LCOS panel 3 are arranged in parallel and are located on the other side of the light guide device 5; wherein the light homogenizing element 2 and the optical lens 4 are close to the light guide device 5; the optical lens 4 is located on the light exit side of the LCOS panel 3, and the light guide device 5 is located on the light exit side of the optical lens 4;

[0165] The illumination light source 1 , the light homogenizing element 2 , the LCOS panel 3 , and the optical lens 4 are all arranged in parallel with the light guide device 5 .

[0166] The difference between the above-mentioned embodiment 4 and the above-mentioned embodiments 1 to 3 is that the light emitted by the light homogenizing element 2 is transmitted to the LCOS panel 3 through the light guide device 5 .

[0167] The specific layout of Embodiments 1 to 4 can be flexibly selected according to the size of the lighting module and the imaging requirements.

[0168] According to yet another embodiment of the present application, an optical display device is provided. The optical display device includes a housing and the LCOS display system as described above.

[0169] The optical display device provided in the embodiment of the present application can be a smart head-mounted device, for example, an AR smart head-mounted device, such as AR glasses or an AR helmet.

[0170] Of course, the optical device can also be used in fields such as vehicle-mounted projection, which is not limited in the present application.

[0171] The specific implementation of the intelligent head mounted device of the embodiment of the present application can refer to the various embodiments of the above-mentioned lighting module, and therefore at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0172] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0173] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A lighting module for an LCOS display system, characterized in that: include: An illumination light source (1), used for emitting illumination light; A light homogenizing element (2) is used to diffuse and homogenize the illumination light emitted by the illumination light source (1); The LCOS panel (3) is used to receive the light after the homogenization process and form a projection light, and then reflect the projection light to the coupling part of the light guide device (5) of the external device; The optical axis of the illumination light source (1) is perpendicular to the light homogenizing element (2); The light homogenizing element (2) is configured to provide the FOV required for each pixel on the LCOS panel (3), and to deflect the emitted light to illuminate the effective display surface of the LCOS panel (3), and the light transmission path of the projection light reflected by the effective display surface of the LCOS panel (3) is located outside the area surrounded by the lines connecting all the edges of the light homogenizing element (2) and the edge of the LCOS panel (3) on one side close to the light homogenizing element (2).

2. The lighting module according to claim 1, characterized in that: The light homogenizing element (2) and the LCOS panel (3) satisfy the following relationship: Wherein, p is the length of the effective display surface of the LCOS panel (3), l is the length of the light homogenizing element (2), d is the straight-line distance from the center of the light homogenizing element (2) to the LCOS panel (3), FOV is the field of view angle of each pixel on the LCOS panel (3), θ is the angle between the central light in the FOV and the LCOS panel (3), and a is the inclination angle of the light homogenizing element (2) relative to the LCOS panel (3).

3. The lighting module according to claim 1 or 2, characterized in that: The light homogenizing element (2) is arranged obliquely relative to the LCOS panel (3).

4. The lighting module according to claim 3, characterized in that: The size of the illumination light source (1) is matched to the size of the light homogenizing element (2).

5. The lighting module according to claim 1 or 2, characterized in that: The light homogenizing element (2) and the LCOS panel (3) are arranged in parallel, and the inclination angle a is a=0°; The light homogenizing element (2) and the LCOS panel (3) satisfy the following relationship:

6. The lighting module according to claim 5, characterized in that: The size of the light homogenizing element (2) is larger than the size of the illumination light source (1).

7. The lighting module according to claim 5, characterized in that: A diffractive optical element (6) is provided between the illumination light source (1) and the light homogenizing element (2); The diffractive optical element (6) is used to perform beam expansion processing on the illumination light emitted by the illumination light source (1) and project the expanded light onto the light homogenizing element (2).

8. The lighting module according to claim 7, characterized in that: The diffractive optical element (6) is arranged in parallel with the illumination light source (1), and the size of the diffractive optical element (6) matches the size of the illumination light source (1).

9. An LCOS display system, characterized in that: include: The lighting module according to any one of claims 1 to 8; and An optical lens (4) and a light guide device (5), wherein the projection light reflected by the LCOS panel (3) passes through the optical lens (4) and is projected onto a coupling-in portion of the light guide device (5); The light guide device (5) is used to receive the light from the coupling-in part and transmit it to the coupling-out part through total reflection for outcoupling; Wherein, the LCOS panel (3) and the light guide device (5) are arranged in parallel.

10. The LCOS display system according to claim 9, characterized in that: The illumination light source (1), the light homogenizing element (2), the LCOS panel (3) and the optical lens (4) are all located on the same side of the light guide device (5), and the illumination light source (1), the light homogenizing element (2) and the optical lens (4) are located between the light guide device (5) and the LCOS panel (3).

11. The LCOS display system according to claim 9, characterized in that: The illumination light source (1) and the light homogenizing element (2) are located on one side of the light guide device (5), and the LCOS panel (3) and the optical lens (4) are located on the other side of the light guide device (5).

12. An optical display device, characterized in that: include: shell; and An LCOS display system as described in any one of claims 9 to 11.

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