Display device and near-eye display equipment
By adding the second display chip and the second polarizer folding component to the LCOS optical solution, combined with polarizing sorting and spectrophot elements, the problem of light energy waste and low light efficiency in the LCOS optical solution are solved, and the significant light efficiency and brightness are achieved. promote.
Patent Information
- Application Number
- CN202421220140.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-30
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2034-05-30
AI Technical Summary
The existing LCoS optical schemes have problems of waste of light energy and low light efficiency, especially since LCoS is a polarized light modulation device, the illumination light needs to be deflected and polarization state selection modulated, resulting in half of the energy waste.
By adding a second display chip and a second polarizing reflective element to the display device, the two polarization states of the illuminating light are fully utilized, and through the combination of polarizing beam splitting elements and polarizing light splitting elements, the waste of light energy is reduced and the light efficiency is improved. and brightness.
The efficient utilization of lighting is achieved, which significantly improves the light efficiency and brightness. Compared with the theoretical light effect of the traditional solution, it has increased by 50%, and it maintains a small volume and compact structure through repetitive use of components.
Smart Images
Figure CN222394242U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of near-eye display, in particular to a display device and a near-eye display equipment. Background Art
[0002] With the continuous development of near-eye display technology, the development of near-eye display technologies such as augmented reality (AR) and virtual reality (VR) is becoming more and more mature. Near-eye display technology includes various forms of solutions such as BB solution, free-form prism solution, array optical waveguide solution and diffraction optical waveguide solution. At present, among the waveguide-based display solutions, the mainstream solutions are LCoS (reflective liquid crystal on silicon) solution, LCD (liquid crystal display) solution, DLP (digital light processing) solution, etc. With the development of LED technology and micro-display chip technology, people are pursuing small volume and high resolution. The display solution of LCoS chip with diffraction waveguide is a relatively popular solution. However, since LCoS is a polarized light modulation device and a passive light-emitting device, it needs to be illuminated by an illumination light source. Most light sources are natural light, and the illumination light needs to be polarized and polarization state selectively modulated. Therefore, the traditional LCoS optical solution will waste half of the energy, resulting in low light efficiency of the LCoS optical solution.
[0003] Currently, a common way to improve light efficiency is to introduce PCS devices to achieve polarization state conversion. However, the processing technology of PCS devices is difficult and the assembly alignment accuracy is high, resulting in low actual polarization conversion efficiency. Utility Model Content
[0004] Based on this, it is necessary to provide a display device and a near-eye display equipment to address the problems of light energy waste and low light efficiency in existing LCoS optical solutions.
[0005] A display device, comprising:
[0006] Lighting components;
[0007] a display component, the display component comprising a polarization beam splitting element, a first display chip and a second display chip, the illumination component being arranged on the incident side of the polarization beam splitting element, the first display chip being arranged on the reflective side of the polarization beam splitting element, and the second display chip being arranged on the transmissive side of the polarization beam splitting element; and
[0008] An imaging component, the imaging component includes an imaging lens group, a polarization beam splitter element, a first polarization refracting element and a second polarization refracting element, the polarization beam splitter element is arranged on the exit side of the polarization beam splitter element, the first polarization refracting element is arranged on the transmission side of the polarization beam splitter element, the second polarization refracting element is arranged on the reflection side of the polarization beam splitter element, and the imaging lens group is arranged in the optical path of the display component.
[0009] The above-mentioned display device can make full use of the two polarization states of the illumination light by additionally adding a second display chip and a second polarization refracting element, reduce energy waste of the illumination light, greatly improve light efficiency and brightness, and can also reuse the polarization beam splitting element and the polarization beam splitting element, and has the characteristics of small volume and compact structure.
[0010] In one embodiment, the first polarization refraction element includes a first reflector and a first quarter-wave plate, and the first quarter-wave plate is arranged between the polarization splitter element and the first reflector; the second polarization refraction element includes a second reflector and a second quarter-wave plate, and the second quarter-wave plate is arranged between the polarization splitter element and the second reflector.
[0011] In this way, by repeatedly utilizing the first quarter wave plate and the second quarter wave plate, the number of components of the display device can be reduced, thereby making the display device smaller in size and more compact in structure.
[0012] In one embodiment, the lighting assembly includes a light source and a light-evening and color-mixing assembly, and the light-evening and color-mixing assembly is disposed between the light source and the polarization beam splitting element.
[0013] Such an arrangement enables the illumination light emitted by the illumination assembly to be more uniform, thereby achieving a better illumination effect.
[0014] In one embodiment, the light homogenizing and color mixing component includes a collimating lens and a light homogenizer, and the collimating lens is arranged between the light source and the light homogenizer.
[0015] With such arrangement, the illumination light emitted by the light source can be converged by the collimating lens, so that more illumination light emitted by the light source can be adjusted by the light homogenizer, thereby reducing the waste of light energy and improving the light efficiency of the light source.
[0016] In one of the embodiments, the collimating lens is a monolithic aspheric lens or a TIR collimating lens, and the light homogenizer is one of a compound eye element, a nano-imprinted microlens array, or a binary light homogenizer with angle modulation.
[0017] In one embodiment, the polarization beam splitting element is a flat wire grid beam splitter or a polarization beam splitting prism with a functional film.
[0018] In one embodiment, the imaging lens assembly includes a first imaging lens, and the first imaging lens is arranged on the exit side of the polarization beam splitting element.
[0019] Such an arrangement enables the first imaging lens to take into account both the optical paths of the first image light and the second image light, thereby reducing the number of components in the display device.
[0020] In one embodiment, the imaging lens assembly further includes a second imaging lens, and the second imaging lens is arranged between the polarization beam splitting element and the polarization beam splitting element.
[0021] Such an arrangement enables the second imaging lens to take into account both the first image light and the second image light, thereby reducing the number of components in the display device.
[0022] In one embodiment, the imaging assembly further comprises a turning mirror set, and the turning mirror set is arranged along the exit side of the polarization beam splitting element.
[0023] With such configuration, the deflection mirror assembly can modulate the directions of the first image light and the second image light emitted from the polarization beam splitting element, so as to subsequently receive or view the display image of the display device.
[0024] A near-eye display device, comprising:
[0025] the device body; and
[0026] As described in any of the above display devices, the display device is arranged on the device body.
[0027] The near-eye display device can be miniaturized and lightweight based on the small size and compact structure of the display device. The near-eye display device also has high light efficiency and brightness, and can provide clear display images. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 A schematic plan view of a display device provided in accordance with an embodiment of the present application;
[0029] Figure 2 A schematic plan view showing a modified example of the display device according to the above embodiment of the present application;
[0030] Figure 3 A schematic plan view showing another modified example of the display device according to the above-mentioned embodiment of the present application.
[0031] Figure numerals: 10, lighting component; 11, light source; 12, light homogenizing and color mixing component; 121, collimating lens; 122, light homogenizer; 20, display component; 21, polarization beam splitter element; 22, first display chip; 23, second display chip; 30, imaging component; 31, imaging lens group; 311, first imaging lens; 312, second imaging lens; 32, polarization beam splitter element; 33, first polarization refracting element; 331, first quarter wave plate; 332, first reflector; 34, second polarization refracting element; 341, second quarter wave plate; 342, second reflector; 40, turning mirror group. DETAILED DESCRIPTION
[0032] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.
[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0036] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.
[0038] Based on the problems of light energy waste and low light efficiency in the existing LCoS optical solution, the present application provides a display device and a near-eye display equipment.
[0039] For details, please refer to Figures 1 to 3The present application provides a display device, which may include an illumination component 10, a display component 20, and an imaging component 30. The illumination component 10 is used to emit illumination light, and the display component 20 includes a polarization beam splitting element 21, a first display chip 22, and a second display chip 23. The illumination component 10 is arranged on the incident side of the polarization beam splitting element 21, the first display chip 22 is arranged on the reflection side of the polarization beam splitting element 21, and the second display chip 23 is arranged on the transmission side of the polarization beam splitting element 21. The imaging component 30 includes an imaging lens group 31, a polarization beam splitting element 32, a first polarization refracting element 33, and a second polarization refracting element 34. The polarization beam splitting element 32 is arranged on the exit side of the polarization beam splitting element 21, the first polarization refracting element 33 is arranged on the transmission side of the polarization beam splitting element 32, and the second polarization refracting element 34 is arranged on the reflection side of the polarization beam splitting element 32. The imaging lens group 31 is arranged in the optical path of the display component 20.
[0040] It can be understood that the polarization beam splitting element 21 can split light into P light and S light, wherein the P light is transmitted and the S light is reflected. The incident side of the polarization beam splitting element 21 is the side where the light is incident, the reflection side of the polarization beam splitting element 21 is the side where the S light is reflected after the light is split by the polarization beam splitting element 21, the transmission side of the polarization beam splitting element 21 is the side where the P light is transmitted after the light is split by the polarization beam splitting element 21, and the output side of the polarization beam splitting element 21 is the side where the P light and the S light reflected back to the polarization beam splitting element 21 are finally emitted. The polarization splitter element 32 can transmit P light and reflect S light. The incident side of the polarization splitter element 32 is the side where light is incident, the reflection side of the polarization splitter element 32 is the side where S light is reflected, the transmission side of the polarization splitter element 32 is the side where P light is transmitted, and the output side of the polarization splitter element 32 is the side where P light and S light reflected back to the polarization splitter element 32 are finally emitted.
[0041] When the illumination light emitted by the illumination component 10 enters the polarization beam splitting element 21, the polarization beam splitting element 21 splits the illumination light into a first illumination light and a second illumination light. The first illumination light is S light, which is reflected by the polarization beam splitting element 21 to the first display chip 22. The first display chip 22 modulates the first illumination light into a first image light, and modulates the first image light into P light. The first image light is reflected back to the polarization beam splitting element 21 by the first display chip 22, and is transmitted through the polarization beam splitting element 21 before being emitted from the exit side of the polarization beam splitting element 21. The second illumination light is P light, which is transmitted by the polarization beam splitting element 21 to the second display chip 23. The second display chip 23 modulates the second illumination light into a second image light, and modulates the second image light into S light. The second image light is reflected back to the polarization beam splitting element 21 by the second display chip 23, and is reflected through the polarization beam splitting element 21 before being emitted from the exit side of the polarization beam splitting element 21. The first image light and the second image light are incident on the polarization beam splitter element 32 from the incident side of the polarization beam splitter element 32, wherein the first image light is transmitted by the polarization beam splitter element 32, and is incident on the first polarization refracting element 33 from the transmission side of the polarization beam splitter element 32, the first polarization refracting element 33 modulates the first image light into S light, and reflects the first image light back to the polarization beam splitter element 32, and after being reflected by the polarization beam splitter element 32, it is emitted from the exit side of the polarization beam splitter element 32; the second image light is reflected by the polarization beam splitter element 32, and is incident on the second polarization refracting element 34 from the reflection side of the polarization beam splitter element 32, the second polarization refracting element 34 modulates the second image light into P light, and reflects the second image light back to the polarization beam splitter element 32, and after being transmitted by the polarization beam splitter element 32, it is emitted from the exit side of the polarization beam splitter element 32. The imaging lens group 31 is used to converge the first image light and the second image light to form an imaging picture.
[0042] In this way, compared with the traditional LCoS display solution, the display device can polarize the illumination light and selectively modulate the polarization state. By adding the second display chip 23 and the second polarization refracting element 34, the two polarization states of the illumination light are fully utilized, the energy waste of the illumination light is reduced, and the light efficiency and brightness can be greatly improved. Compared with the solution with only one display chip, the theoretical light efficiency of this solution can be improved by 50%. In addition, the two optical paths of the display device reuse the polarization beam splitting element 21 and the polarization beam splitting element 32, and have the characteristics of small volume and compact structure.
[0043] Alternatively, if Figure 1 and Figure 2As shown, in one embodiment, the polarization beam splitter element 21 is a flat wire grid beam splitter or a polarization beam splitter prism with a functional film. When the polarization beam splitter element 21 is a polarization beam splitter prism, two beam splitting surfaces of the polarization beam splitter prism are attached with a polarization beam splitting functional film, and the functional film includes but is not limited to a traditional PBS medium beam splitter film or a polarization beam splitter film (3M).
[0044] Optionally, in one embodiment, the first display chip 22 and the second display chip 23 are LCoS chips.
[0045] Optionally, in one embodiment, the polarization beam splitter 32 is a PBS prism.
[0046] More specifically, if Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment, the first polarization refraction element 33 includes a first reflector 332 and a first quarter wave plate 331, and the first quarter wave plate 331 is disposed between the polarization splitting element 32 and the first reflector 332; the second polarization refraction element 34 includes a second reflector 342 and a second quarter wave plate 341, and the second quarter wave plate 341 is disposed between the polarization splitting element 32 and the second reflector 342. When the first image light passes through the first quarter wave plate 331 for the first time, the first image light is modulated by 45°, and when the first image light is reflected by the first reflector 332 and passes through the first quarter wave plate 331 for the second time, the first image light is modulated by 45° again. In this way, the first polarization refraction element 33 can modulate the first image light from P light to S light. Similarly, the second image light can also be modulated from S light to P light by the second polarization refraction element 34. In this way, by repeatedly utilizing the first quarter wave plate 331 and the second quarter wave plate 341 , the number of components of the display device can be reduced, thereby making the display device smaller in size and more compact in structure.
[0047] For example, Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment, the first reflector 332 and the second reflector 342 can be concave reflectors.
[0048] Furthermore, if Figure 1 , Figure 2 and Figure 3As shown, in one embodiment, the lighting assembly 10 includes a light source 11 and a light-homogenizing and color-mixing assembly 12, and the light-homogenizing and color-mixing assembly 12 is disposed between the light source 11 and the polarization beam splitting element 21. The light source 11 is used to emit RGB three-color light, and the light-homogenizing and color-mixing assembly 12 is used to homogenize and color-mix the RGB three-color light emitted by the light source 11 into uniform lighting light. With such an arrangement, the lighting light emitted by the lighting assembly 10 can be more uniform, so as to achieve a better lighting effect.
[0049] Optionally, in one embodiment, the light homogenizing and color mixing component 12 includes a collimating lens 121 and a homogenizer 122, and the collimating lens 121 is disposed between the light source 11 and the homogenizer 122. The collimating lens 121 is used to converge the RGB three-color light emitted by the light source 11, and the homogenizer 122 is used to make the RGB three-color light more uniform after being converged by the collimating lens 121. In this way, through the convergence of the collimating lens 121, the illumination light emitted by the light source 11 can be more adjusted by the homogenizer 122, thereby reducing the waste of light energy and improving the light efficiency of the light source 11.
[0050] For example, in one embodiment, the collimating lens 121 includes but is not limited to a monolithic aspheric lens or a TIR collimating lens. The light homogenizer 122 includes but is not limited to a traditional compound eye element, a nano-imprinted microlens array, or other binary light homogenizing devices with angle modulation.
[0051] Further, in one embodiment, the imaging lens group 31 includes a first imaging lens 311, and the first imaging lens 311 is arranged on the exit side of the polarization beam splitter 32. The first imaging lens 311 is arranged on the exit side of the polarization beam splitter 32, so that the first imaging lens 311 can take into account both the first image light and the second image light, thereby reducing the number of components in the display device.
[0052] Preferably, if Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment, the imaging lens group 31 further includes a second imaging lens 312, and the second imaging lens 312 is disposed between the polarization beam splitting element 21 and the polarization beam splitting element 32. The second imaging lens 312 is disposed on the exit side of the polarization beam splitting element 21, so that the second imaging lens 312 can take into account both the first image light and the second image light, thereby reducing the number of components in the display device.
[0053] More preferably, if Figure 3As shown, in one embodiment, the imaging assembly 30 further includes a turning mirror group 40, which is arranged along the exit side of the polarization beam splitter 32. The turning mirror group 40 can modulate the directions of the first image light and the second image light emitted from the polarization beam splitter 32 to adapt to different product appearance design requirements.
[0054] Exemplarily, the turning mirror assembly 40 includes but is not limited to a turning prism or a reflecting mirror.
[0055] Furthermore, the present application also provides a near-eye display device, which may include a device body and a display device as described above, and the display device is arranged on the device body. Based on the characteristics of the small size and compact structure of the display device, the near-eye display device can be miniaturized and lightweight. The near-eye display device also has high light efficiency and brightness, and can provide a clear display image.
[0056] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0057] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. A display device, characterized in that: include: Lighting components; A display component, wherein the display component comprises a polarization beam splitting element, a first display chip and a second display chip, wherein the illumination component is arranged at the incident side of the polarization beam splitting element, the first display chip is arranged at the reflective side of the polarization beam splitting element, and the second display chip is arranged at the transmissive side of the polarization beam splitting element; and An imaging component, the imaging component includes an imaging lens group, a polarization beam splitter element, a first polarization refracting element and a second polarization refracting element, the polarization beam splitter element is arranged on the exit side of the polarization beam splitter element, the first polarization refracting element is arranged on the transmission side of the polarization beam splitter element, the second polarization refracting element is arranged on the reflection side of the polarization beam splitter element, and the imaging lens group is arranged in the optical path of the display component.
2. The display device according to claim 1, characterized in that The first polarization refracting element includes a first reflector and a first quarter-wave plate, and the first quarter-wave plate is arranged between the polarization splitting element and the first reflector; the second polarization refracting element includes a second reflector and a second quarter-wave plate, and the second quarter-wave plate is arranged between the polarization splitting element and the second reflector.
3. The display device according to claim 1, characterized in that The lighting assembly comprises a light source and a light-homogenizing and color-mixing assembly, and the light-homogenizing and color-mixing assembly is arranged between the light source and the polarization beam splitting element.
4. The display device according to claim 3, characterized in that: The light homogenizing and color mixing component comprises a collimating lens and a light homogenizer, and the collimating lens is arranged between the light source and the light homogenizer.
5. The display device according to claim 4, characterized in that: The collimating lens is a monolithic aspheric lens or a TIR collimating lens, and the light homogenizer is one of a compound eye element, a nano-imprinted microlens array, or a binary light homogenizer with angle modulation.
6. The display device according to any one of claims 1 to 5, characterized in that: The polarization beam splitting element is a flat wire grid beam splitter or a polarization beam splitting prism with a functional film.
7. The display device according to any one of claims 1 to 5, characterized in that: The imaging lens group includes a first imaging lens, and the first imaging lens is arranged on the exit side of the polarization beam splitting element.
8. The display device according to any one of claims 1 to 5, characterized in that: The imaging lens assembly further includes a second imaging lens, which is arranged between the polarization beam splitting element and the polarization beam splitting element.
9. The display device according to any one of claims 1 to 5, characterized in that: The imaging component further comprises a turning mirror group, and the turning mirror group is arranged along the exit side of the polarization beam splitting element.
10. A near-eye display device, characterized in that: include: Equipment body; and The display device according to any one of claims 1 to 9, wherein the display device is arranged on the device body.