Polarized light conversion module applied to LED light source

Abstract

The utility model belongs to the technical field of photoelectricity, and particularly relates to a polarized light conversion module applied to an LED light source. The module shell is provided with a lower incident plane and an upper emergent plane; the polarizing film is a P-transmitting and S-reflecting polarizing film, is positioned in the middle of the module shell, is obliquely arranged, is used for dividing the non-polarized light into P polarized light and S polarized light, and divides the incident plane into a first incident plane and a second incident plane; the reflecting surfaces are positioned on two sides in the module shell, are parallel to the polarizing film and are used for reflecting the S polarized light to change the propagation direction; the wave plates are located on the two sides of the upper portion of the module shell and used for rotating the polarization direction of the reflected S polarized light by 90 degrees and converting the S polarized light into P polarized light. The emergent surface comprises a first emergent surface, a second emergent surface and a third emergent surface, the second emergent surface is positioned between the first emergent surface and the third emergent surface, and the two wave plates are respectively positioned on the first emergent surface and the third emergent surface. According to the module, the performance of the display equipment is remarkably improved by enhancing polarization matching and improving the light efficiency.

Description

Technical Field

[0001] The utility model belongs to the field of optoelectronic technology, and specifically relates to a polarization conversion module applied to an LED light source. Background Art

[0002] In modern display technology, especially in liquid crystal display (LCD) and liquid crystal on silicon (LCOS) projection technology, the application of polarized light is crucial. Polarized light can effectively improve image quality and increase the efficiency of display devices. However, most LED light sources emit unpolarized light, which is a limitation for display systems that rely on polarized light.

[0003] Traditionally, converting unpolarized light into polarized light requires complex optical components such as polarization beam splitters, wave plates, and multilayer polarization films. These components not only increase the overall size and weight of the system, but also significantly increase the cost. For example, a common polarization conversion system may include multiple components such as a fly-eye lens, an array polarization beam splitter, and a relay lens group. The complexity of this structure not only affects the integration of the device, but also limits its application in small or portable devices.

[0004] In addition, since these complex systems usually involve multiple light propagations and reflections, light efficiency is often affected, resulting in suboptimal utilization of light energy in practical applications. This means that although existing technologies can achieve polarization conversion, they still suffer from low light efficiency and high costs. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] The utility model mainly aims at the above problems and proposes a polarization conversion module applied to LED light sources, the purpose of which is to solve how to effectively convert the non-polarized light emitted by the LED into polarized light through a compact and low-cost device, thereby improving the light efficiency and display quality of liquid crystal display and projection systems.

[0007] (II) Technical solution

[0008] To achieve the above object, the utility model provides a polarization conversion module applied to an LED light source, comprising:

[0009] A module housing having a lower incident surface and an upper exit surface;

[0010] A polarizing film, which is a P-transmissive and S-reflective polarizing film, is located in the middle of the module housing and is tilted, and is used to separate non-polarized light into P-polarized light and S-polarized light, and the polarizing film separates the incident surface into a first incident surface and a second incident surface;

[0011] Reflective surfaces, located on both sides of the inner side of the module housing, parallel to the polarizing film, and used to reflect S-polarized light to change its propagation direction;

[0012] Wave plates, located on both sides above the module housing, are used to rotate the polarization direction of the reflected S-polarized light by 90 degrees to convert it into P-polarized light;

[0013] The exit surface includes a first exit surface, a second exit surface and a third exit surface, the second exit surface is located between the first exit surface and the third exit surface, and the two wave plates are respectively located on the first exit surface and the third exit surface.

[0014] Furthermore, the wave plate is a 1 / 2 wave plate.

[0015] Furthermore, the length of the wave plate is equal to the distance between the reflection surface and the polarization film.

[0016] Furthermore, the module housing is in an inverted trapezoidal structure, with a wide upper portion and a narrow lower portion.

[0017] Furthermore, the first emission surface and the third emission surface are equal in length.

[0018] Furthermore, the polarization conversion module is installed in the light bucket, the light bucket is an inverted trapezoidal structure, with a wide upper part and a narrow lower part, and the polarization conversion module is arranged close to the lower part of the light bucket.

[0019] Furthermore, an LED light source is arranged on the outer side of the bottom of the light bucket, a rear mirror is arranged on the outer side of the top of the light bucket, and an LCD screen is arranged on the outer side of the rear mirror.

[0020] Furthermore, the polarization conversion module is snap-fitted and connected to the LED light source.

[0021] (III) Beneficial effects

[0022] Compared with the prior art, the utility model provides a polarization conversion module for LED light sources, which effectively solves the problem of converting non-polarized light emitted by LED light sources into polarized light through its unique structural design, thereby improving the light efficiency and display quality of liquid crystal display and projection systems. The module includes a module housing, in which a P-reflective S-polarization film and a reflective surface are provided, as well as wave plates located on both sides of the housing. The non-polarized light is first divided into P-polarized light and S-polarized light through the polarization film, wherein the P-polarized light is directly transmitted, while the S-polarized light is reflected by the reflective surface and changes the propagation direction. The reflected S-polarized light is further processed by the wave plate, and its polarization direction is rotated 90 degrees and converted into the same polarization state as the P-polarized light. In this way, through the exit surface of the module, all light is emitted in the form of P-polarized light, which effectively improves the utilization rate of light and reduces energy loss. This design not only simplifies the structure and reduces costs, but also significantly improves the performance of the display device by enhancing polarization matching and improving light efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of a polarization conversion module applied to an LED light source disclosed in this application.

[0024] Figure 2 A schematic diagram of a polarization conversion module disclosed in this application applied to LCD projection lighting.

[0025] Reference numerals shown in the figures:

[0026] 1. Module housing; 2. Polarization film; 3. Reflection surface; 4. Wave plate; 5. Light bucket; 6. LED light source; 7. Rear mirror; 8. LCD screen; 9. First incident surface; 10. Second incident surface; 11. First exit surface; 12. Second exit surface; 13. Third exit surface. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below in conjunction with the accompanying drawings, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0030] like Figure 1 As shown, the utility model proposes an innovative polarization conversion module design for LED light sources, which aims to efficiently convert non-polarized light into polarized light, thereby improving the light efficiency and image quality of liquid crystal display and projection equipment. Specifically, it includes the following components:

[0031] Module housing 1: designed to have a lower incident surface and an upper exit surface, forming a main transmission path for light.

[0032] Polarizing film 2: A P-transmissive and S-reflective polarizing film is selected, which is arranged in the middle of the module housing 1 and is placed in an inclined manner. Its main function is to split the incident non-polarized light into P-polarized light and S-polarized light, and at the same time divide the incident surface into a first incident surface 9 and a second incident surface 10;

[0033] Reflection surface 3: It is located on both sides of the inner side of the module housing 1 and is parallel to the polarization film 2. Its main function is to reflect S-polarized light and change its propagation direction for further processing;

[0034] Wave plates 4 are arranged on both sides above the module housing 1. The wave plates 4 are used to process the reflected S-polarized light and convert it into P-polarized light by rotating its polarization direction by 90 degrees.

[0035] The exit surface is designed to be composed of three parts: a first exit surface 11, a second exit surface 12 and a third exit surface 13, wherein the second exit surface 12 is located between the first exit surface 11 and the third exit surface 13, and the wave plate 4 is respectively arranged on the first exit surface 11 and the third exit surface 13.

[0036] The working principle of polarization conversion module is as follows Figure 1As shown: the LED light source emits non-polarized light. After the non-polarized light enters the polarization conversion module, it is divided into P polarized light and S polarized light on the P-reflective S polarization film. The P polarized light directly passes through the polarization film 2, as shown by the thin black solid line, and the S polarized light is reflected, as shown by the dotted line; the transmitted P polarized light passes through the second exit surface 12 and directly exits the polarization conversion module; the reflected S polarized light is reflected again by the reflection surface 3, and then emitted from the first exit surface 11 and the third exit surface 13 to the wave plate 4. The wave plate has the function of rotating the polarization direction of the light by 90 degrees. The S polarized light is converted into P polarized light after polarization rotation by the 1 / 2 wave plate; thus, the small-angle light energy that accounts for the vast majority of the energy in the LED light source is emitted in the form of linearly polarized light.

[0037] In this embodiment, the wave plate used in the module is a 1 / 2 wave plate, which is specially selected to adjust the polarization direction. This wave plate can rotate the reflected S polarized light by 90 degrees and convert it into P polarized light, thereby improving the utilization efficiency of light.

[0038] The length of the wave plate 4 is equal to the distance between the reflective surface 3 and the polarizing film 2 , which ensures that the light can be completely covered when passing through the wave plate 4 , thereby optimizing the light conversion effect.

[0039] The module housing 1 is in an inverted trapezoidal structure, and the overall shape is similar to a wide-mouthed funnel. The upper part is wider and the lower part is narrower, which helps to better concentrate and adjust the propagation path of the light. On the other hand, it is closely combined with the LED light source 6. In this embodiment, the polarization conversion module is snap-fitted and connected with the LED light source 6.

[0040] In addition, the lengths of the first emitting surface 11 and the third emitting surface 13 are designed to be equal, which helps to evenly distribute the emitted light, thereby improving the overall light efficiency.

[0041] Figure 2 This is an example of the polarization conversion module being applied to LCD projection lighting. After the light source is emitted by the polarization conversion module, it provides illumination for the LCD screen in the form of linearly polarized light. In addition, the light source + polarization conversion module can also be used with traditional collimation modules, compound eye homogenization modules, relay modules, PBS and other kits to provide illumination for LCOS or LCD.

[0042] Specifically, the polarization conversion module is installed in the light box 5. The light box 5 adopts an inverted trapezoidal structure, which is wide at the top and narrow at the bottom. Such a shape is conducive to the concentration and directivity control of light. The polarization conversion module is located at the bottom of the light box 5, which can maximize the use of space while ensuring that the light is properly concentrated before entering the polarization film.

[0043] The LED light source 6 is installed on the outside of the bottom of the light box 5 and is directly connected to the polarization conversion module. This tight connection ensures that the light can directly enter the polarization conversion module after being emitted from the LED light source, reducing the loss of light during transmission.

[0044] A rear mirror 7 is mounted on the outside of the top of the light hopper 5 to further optimize the direction and quality of the light. An LCD screen 8 is mounted on the outside of the rear mirror 7, and this design allows the processed polarized light to be directly used to improve the effect and efficiency of LCD display.

[0045] The polarization conversion module of the utility model effectively improves the overall light effect and installation convenience through its exquisite and simplified design. Compared with the traditional polarization conversion system, the module avoids complex component configurations such as compound eye lenses and array polarization splitter prisms, and instead uses a compact unit that is directly snapped onto the LED light source, significantly simplifying the structure and reducing costs. This design not only reduces the size of the module, but also makes the combination with the LED light source more compact, facilitating integrated production and transportation. More importantly, the module can effectively convert non-polarized light into polarized light, and ensure that the outgoing light perfectly matches the polarization direction of the display screen, thereby improving the geometric light effect and greatly improving the visual performance and energy efficiency of the display device.

[0046] Therefore, no matter from which point of view, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present application is limited by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present application. Any figure mark in the claims should not be regarded as limiting the claims involved. In addition, it is obvious that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices stated in the device claim can also be implemented by the same unit or device through software or hardware. The words first, second, etc. are used to indicate names, and do not indicate any particular order.

[0047] The above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person skilled in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A polarization conversion module applied to an LED light source, characterized in that: include: A module housing having a lower incident surface and an upper exit surface; A polarizing film, which is a P-transmissive and S-reflective polarizing film, is located in the middle of the module housing and is tilted, and is used to separate non-polarized light into P-polarized light and S-polarized light, and the polarizing film separates the incident surface into a first incident surface and a second incident surface; Reflective surfaces, located on both sides of the inner side of the module housing, parallel to the polarizing film, and used to reflect S-polarized light to change its propagation direction; Wave plates, located on both sides above the module housing, are used to rotate the polarization direction of the reflected S-polarized light by 90 degrees to convert it into P-polarized light; The exit surface includes a first exit surface, a second exit surface and a third exit surface, the second exit surface is located between the first exit surface and the third exit surface, and the two wave plates are respectively located on the first exit surface and the third exit surface.

2. The polarization conversion module for LED light source according to claim 1, characterized in that: The wave plate is a 1 / 2 wave plate.

3. The polarization conversion module for LED light source according to claim 1, characterized in that: The length of the wave plate is equal to the distance between the reflection surface and the polarization film.

4. The polarization conversion module for LED light source according to claim 1, characterized in that: The module housing is in an inverted trapezoidal structure, with a wide upper portion and a narrow lower portion.

5. The polarization conversion module for LED light source according to claim 1, characterized in that: The first exit surface and the third exit surface are equal in length.

6. The polarization conversion module for LED light source according to claim 1, characterized in that: The polarization conversion module is installed in the light bucket, and the light bucket is in an inverted trapezoidal structure, with a wide upper part and a narrow lower part. The polarization conversion module is arranged close to the lower part of the light bucket.

7. The polarization conversion module for LED light source according to claim 6, characterized in that: An LED light source is arranged on the outer side of the bottom of the light bucket, a rear mirror is arranged on the outer side of the top of the light bucket, and an LCD screen is arranged on the outer side of the rear mirror.

8. The polarization conversion module for LED light source according to claim 7, characterized in that: The polarization conversion module is buckled and connected to the LED light source.

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