Light source module, light output device and display device

Abstract

The present application relates to a light source module, a light emitting device and a display device. The light source module includes a first light source, a second light source, a first polarization conversion component, a second polarization conversion component, a first light selection component and a second light selection component. The first polarization conversion component and the second polarization conversion component can both reflect and convert the second polarization state light into the first polarization state light; one side of the first light selection component is obliquely opposite to the first light source and the first polarization conversion component; one side of the second light selection component is obliquely opposite to the second light source and the second polarization conversion component; parts of the first light selection component and the second light selection component can transmit the first polarization state light and reflect the second polarization state light, parts of the first light selection component can transmit the first color light and reflect the second color light, and parts of the second light selection component can transmit the second color light and reflect the first color light. The above light source module is conducive to improving light output efficiency and color uniformity.

Description

Technical Field

[0001] The present application relates to the field of polarization imaging technology, and in particular to a light source module, a light emitting device and a display device. Background Art

[0002] With the rapid development of polarization imaging technology, AR display devices, projection devices and other display devices usually use optical machines that emit light of different polarization states, such as S light or P light, and can achieve higher imaging quality with LCOS (liquid crystal on silicon) chips. However, the optical machines that can be used to emit polarized light currently have low light output efficiency and are prone to color deviation and other problems, resulting in reduced display quality. Utility Model Content

[0003] Based on this, it is necessary to provide a light source module, a light output device and a display device to improve the light output efficiency and display quality of the optical machine.

[0004] A light source module, comprising:

[0005] A first light source, used to emit light of a first color;

[0006] A second light source, used to emit a second color light whose color is different from the first color light;

[0007] A first polarization conversion component and a second polarization conversion component, wherein the first polarization conversion component and the second polarization conversion component are both capable of reflecting and converting the second polarization state light into the first polarization state light;

[0008] a first light selection component, one side of which is obliquely opposite to the first light source and the first polarization conversion component, and comprises a first polarization element and a first transflective film, the first polarization element being capable of transmitting light of a first polarization state and reflecting light of a second polarization state, the first transflective film being capable of transmitting light of the first color and reflecting light of the second color;

[0009] A second light selection component, one side of the second light selection component is obliquely opposite to the second light source and the second polarization conversion component, and the other side opposite thereto corresponds to the other side opposite thereto of the first light selection component, the second light selection component includes a second polarization element and a second transflective film, the second polarization element can transmit the first polarization state light and reflect the second polarization state light, the second transflective film can transmit the second color light and reflect the first color light.

[0010] In the above light source module, the first polarized light emitted by the first light source and the second light source can be emitted from the light source module, and the second polarized light emitted by the first light source and the second light source can be converted into the first polarized light by the first polarization conversion component and the second polarization conversion component respectively to be emitted from the light source module, and the first color light emitted by the first light source and the second color light emitted by the second light source can be mixed and emitted from the light source module together. Thus, the above light source module, while realizing the emission of the first polarized light, can also convert the second polarized light emitted by the light source into the first polarized light for emission, effectively improving the light utilization efficiency, and the first color light and the second color light emitted from the first light selection component and the second light selection component can be mixed and emitted, so that different color lights are emitted coaxially, which can effectively suppress the phenomenon of color difference and improve the display quality of the light source module.

[0011] In one embodiment, the first polarizing element is located on a side of the first transflective film facing the first light source, and the second polarizing element is located on a side of the second transflective film facing the second light source.

[0012] In one embodiment, the light source module also includes a first prism, a second prism and a third prism, all of which are right-angle prisms, the two right-angle surfaces of the third prism are respectively opposite to the inclined surface of the first prism and the inclined surface of the second prism, the two right-angle surfaces of the first prism are respectively opposite to the first light source and the first polarization conversion component, the two right-angle surfaces of the second prism are respectively opposite to the second light source and the second polarization conversion component, one of the first polarizing element and the first transflective film is arranged on the inclined surface of the first prism, and the other is arranged on the right-angle surface of the third prism, one of the second polarizing element and the second transflective film is arranged on the inclined surface of the second prism, and the other is arranged on the right-angle surface of the third prism.

[0013] In one embodiment, the light source module also includes two glass plates, which are respectively arranged obliquely on the light output paths of the first light source and the second light source, the first polarizing element and the first transflective film are respectively arranged on the two opposite surfaces of one of the glass plates, and the second polarizing element and the second transflective film are respectively arranged on the two opposite surfaces of the other glass plate.

[0014] In one embodiment, the first light selection component and the second light selection component are perpendicular to each other, and the light emitting directions of the first light source and the second light source are parallel to the reflecting surfaces of the first polarization conversion component and the second polarization conversion component.

[0015] In one embodiment, the first polarization conversion component and the second polarization conversion component are located on opposite sides of the first light selection component and the second light selection component, the first light source and the second light source are located on the same side of the first light selection component and the second light selection component, and the positions of the first light selection component and the second light selection component in the light emitting direction of the first light source correspond to each other.

[0016] The first light source and the second light source are located on opposite sides of the first light selection component and the second light selection component, the first polarization conversion component and the second polarization conversion component are located on the same side of the first light selection component and the second light selection component, and the positions of the first light selection component and the second light selection component in a direction perpendicular to the reflective surface of the first polarization conversion component correspond to each other.

[0017] In one embodiment, the first polarization conversion component includes a reflector and a phase delay element located between the reflector and the first light selection component, and the second polarization conversion component includes a reflector and a phase delay element located between the reflector and the second light selection component.

[0018] In one embodiment, the first color light comprises red light, and the second color light comprises green light and blue light; and / or,

[0019] The polarization directions of the first polarization state light and the second polarization state light are perpendicular to each other, and the polarization plane of one of the first polarization state light and the second polarization state light is perpendicular to the light propagation direction.

[0020] In one embodiment, the light source module also includes a first color filter film and a second color filter film, the first color filter film is arranged on the light exit path of the first polarization state light corresponding to the first light selection component, the first color filter film can transmit the second color light and attenuate part of the first color light, the second color filter film is arranged on the light exit path of the second light selection component corresponding to the first polarization state light, the second color filter film can transmit the first color light and attenuate part of the second color light.

[0021] A light emitting device comprises a substrate and a plurality of light source modules as described in any one of the above embodiments, wherein the light source module is arranged in the housing, and the plurality of light source modules are arranged in an array on the substrate.

[0022] In one embodiment, in an array formed by a plurality of the light source modules, a plurality of the first light sources and a plurality of the second light sources are arranged in an array, and any one of the first light sources is adjacent to the other first light sources and the second light sources in a first direction and a second direction respectively, or any one of the first light sources is adjacent to the second light source in both the first direction and the second direction, and the first direction and the second direction are two mutually perpendicular directions on a plane parallel to the substrate.

[0023] In one embodiment, the first light source and the second light source are arranged on the substrate in a matrix of 2*2, 4*4 or 8*8.

[0024] In one embodiment, the directions in which the first light sources of the plurality of light source modules point to the second light sources are parallel to each other, parallel to the first direction, and perpendicular to the second direction. The first direction and the second direction are two perpendicular directions on a plane parallel to the substrate.

[0025] In one embodiment, the light source module further includes two collimating lenses, and the two collimating lenses are respectively opposite to the first light source and the second light source;

[0026] Alternatively, the light emitting device comprises a collimator, which is disposed on the light emitting sides of the first light source and the second light source, and the projection of the collimator on the substrate covers a plurality of the first light sources and a plurality of the second light sources.

[0027] A display device comprises the light source module as described in any one of the above embodiments, or the light emitting device as described in any one of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the structure of the light source module in some embodiments.

[0029] Figure 2 Schematic diagram of the structure of the light source module in some other embodiments.

[0030] Figure 3 It is a schematic diagram of the structure in which the light selection component is arranged on a glass plate in some embodiments.

[0031] Figure 4 It is a schematic diagram of the structure in which the light selection components are arranged on the glass plate in some other embodiments.

[0032] Figure 5 Schematic diagram of the structure of the first light source and the second light source of the light emitting device in some embodiments.

[0033] Figure 6 Schematic diagram of the structure of the first light source and the second light source of the light emitting device in some other embodiments.

[0034] Reference numerals:

[0035] 10. Light source module; 11. First light source; 12. Second light source; 13. First polarization conversion component; 131. Reflector; 132. Phase delay element; 14. Second polarization conversion component; 15. First light selection component; 151. First polarization element; 152. First transflective film; 16. Second light selection component; 161. Second polarization element; 162. Second transflective film; 17. First prism; 18. Second prism; 19. Third prism; 21. Glass plate; 22. First color filter film; 23. Second color filter film; 24. Collimator; 30. Light output device; 31. Substrate. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application 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 present application. However, the present application 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 present application, so the present application is not limited by the specific embodiments disclosed below.

[0037] In the description of the present application, it should be understood that if 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", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0038] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0039] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated 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 this application can be understood according to the specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the 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. The first feature being "below", "below" and "below" the 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.

[0041] It should be noted that if 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. If 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. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0042] See also Figure 1 , Figure 1 Schematic diagram of the structure of the light source module 10 in some embodiments. The light source module 10 provided in the present application can be used to emit light in a polarization state, such as emitting light in a first polarization state or light in a second polarization state. In the present application, the polarization directions of the first polarization state light and the second polarization state light can be perpendicular to each other, and the polarization plane of one of the first polarization state light and the second polarization state light can be perpendicular to the propagation direction of the light. For example, one of the first polarization state light and the second polarization state light can be P light, and the other can be S light.

[0043] The light source module 10 can be used in the light emitting device 30 of any applicable display device such as AR equipment and projection equipment. In the light emitting device 30, the light source module 10 can be used in conjunction with a reflective modulation element such as a silicon-based liquid crystal chip. The first polarized light or the second polarized light provided by the light source module 10 can cooperate with the reflective modulation element to achieve the reflective modulation effect of the light, so that the reflective modulation element can modulate the light by adjusting the arrangement of liquid crystal molecules to form an image. In the present application, the light emitting device 30 can be an optical machine in a display device. Of course, the application of the light source module 10 is not limited to the description of this application. The light source module 10 can also be used in any other applicable scene that requires polarized light for illumination, projection or display. The application of the light source module 10 is not limited in this application.

[0044] refer to Figure 1 As shown, in some embodiments, the light source module 10 includes a first light source 11, a second light source 12, a first polarization conversion component 13, a second polarization conversion component 14, a first light selection component 15, and a second light selection component 16. The first light source 11 is used to emit a first color light, and the second light source 12 is used to emit a second color light. The colors of the first color light and the second color light are different. The specific color distribution of the first color light and the second color light is not limited, as long as the first color light and the second color light are mixed to meet the display requirements, for example, white light can be formed after mixing. For example, the first color light can be one of red light, green light and blue light, and the second color light can be the other two of red light, green light and blue light. In this application, the first color light is red light, and the second color light includes green light and blue light as an example.

[0045] The first polarization conversion component 13 and the second polarization conversion component 14 are both capable of receiving the second polarization state light, and reflecting the second polarization state light toward the same side and converting it into the first polarization state light. The first light selection component 15 and the second light selection component 16 are both capable of transmitting the first polarization state light and reflecting the second polarization state light. The first light selection component 15 is also capable of transmitting the first color light and reflecting the second color light, and the second light selection component 16 is also capable of transmitting the second color light and reflecting the first color light. The surface of one side of the first light selection component 15 is obliquely opposite to the first light source 11 and the first polarization conversion component 13, that is, when the first light selection component 15 receives the first color light emitted by the first light source 11, it can reflect the second polarization state light onto the first polarization conversion component 13. The surface of one side of the second light selection component 16 is obliquely opposite to the second light source 12 and the second polarization conversion component 14, that is, when the second light selection component 16 receives the second color light emitted by the second light source 12, it can reflect the second polarization state light onto the second polarization conversion component 14. The other side surface of the first light selection component 15 opposite to the other side surface of the second light selection component 16 is obliquely or vertically opposite to the other side surface of the second light selection component 16 opposite to the first light selection component 15.

[0046] In the above light source module 10, the first polarized light emitted by the first light source 11 and the second light source 12 can be emitted from the light source module 10, and the second polarized light emitted by the first light source 11 and the second light source 12 can be converted into the first polarized light by the first polarization conversion component 13 and the second polarization conversion component 14 respectively and emitted from the light source module 10, and the first color light emitted by the first light source 11 and the second color light emitted by the second light source 12 can be mixed and emitted together from the light source module 10. Thus, the above light source module 10, while realizing the emission of the first polarized light, can also convert the second polarized light emitted by the light source into the first polarized light for emission, effectively improving the light utilization efficiency, and the first color light and the second color light emitted from the first light selection component 15 and the second light selection component 16 can be mixed and emitted, so that different color lights are emitted coaxially, which can effectively suppress the phenomenon of color difference and the like, and improve the display quality of the light source module 10.

[0047] The specific optical path of the light source module 10 will be gradually expanded in the subsequent description. It should be noted that the layout of each component in the light source module 10 is different, and the light path corresponding to the light source module 10 is also different. Figure 1 and Figure 2 2 respectively illustrate the optical paths of the light source module 10 under two different component layouts. Of course, the components of the light source module 10 may have other layouts, as long as the first polarization state light emitted by the first light source 11 and the second light source 12 can be emitted, the second polarization state light can be converted into the first polarization state light, and the first color light and the second color light can be mixed and emitted.

[0048] refer to Figure 1 As shown, in some embodiments, the first polarization conversion component 13 and the second polarization conversion component 14 are located on opposite sides of the first light selection component 15 and the second light selection component 16, and the first light source 11 and the second light source 12 are located on the same side of the first light selection component 15 and the second light selection component 16. The positions of the first light selection component 15 and the second light selection component 16 in the light emitting direction of the first light source 11 correspond to each other, that is, in this embodiment, the other side surface of the first light selection component 15 opposite to the other side surface of the second light selection component 16 opposite to each other is inclined or perpendicular to each other, so that a straight line perpendicular to the reflective surface of the first polarization conversion component 13 can pass through the first polarization conversion component 13, the first light selection component 15, the second light selection component 16 and the second polarization conversion component 14 in sequence.

[0049] It is understandable that the first light source 11 and the second light source 12 can both be non-polarized light sources, including but not limited to any suitable light-emitting element such as LED (light-emitting diode), laser diode, etc. The light of corresponding colors emitted by the first light source 11 and the second light source 12 includes two polarization components, namely, the first polarization state light and the second polarization state light. Figure 1 In the illustrated embodiment, it is taken that the first polarization state light is P light and the second polarization state light is S light as an example.

[0050] In the light of the first light source 11, the first color light in the first polarization state ( Figure 1 The light P shown R1 ) is incident on the first light selection component 15, and then is emitted from the light source module 10 after passing through the first light selection component 15. The first color light in the second polarization state ( Figure 1 The light S shown R ) is incident on the first light selection component 15, is reflected by the first light selection component 15 to the first polarization conversion component 13, and is converted by the first polarization conversion component 13 into a first color light in a first polarization state ( Figure 1 The light P shown R2 ) and reflected back to the first light selection component 15, and then transmitted through the first light selection component 15 to the second light selection component 16, and reflected by the second light selection component 16 to exit the light source module 10. Among the light emitted by the second light source 12, the second color light in the first polarization state ( Figure 1 The light P shown GB1 ) is incident on the second light selection component 16, and the light P that passes through the second light selection component 16 and is reflected by the second light selection component 16 R2 The mixed light is emitted from the light source module 10. The second color light in the second polarization state ( Figure 1 The light S shown GB) is incident on the second light selection component 16, and is reflected by the light selection component to the second polarization conversion component 14, thereby being converted by the second polarization conversion component 14 into a second color light in the first polarization state ( Figure 1 The light P shown GB2 ) and reflected back to the second light selection component 16, and then transmitted through the second light selection component 16 to the first light selection component 15, and then reflected by the first light selection component 15 and the light P transmitted by the first light selection component 15 R1 The mixed emission light source module 10 .

[0051] refer to Figure 2 As shown, in other embodiments, the first polarized light is P light and the second polarized light is S light. The first light source 11 and the second light source 12 are located on opposite sides of the first light selection component 15 and the second light selection component 16, and the first polarization conversion component 13 and the second polarization conversion component 14 are located on the same side of the first light selection component 15 and the second light selection component 16. The positions of the first light selection component 15 and the second light selection component 16 in a direction perpendicular to the reflective surface of the first polarization conversion component 13 correspond to each other, that is, in this embodiment, the other side surface of the first light selection component 15 opposite to the other side surface of the second light selection component 16 opposite to each other is inclined or perpendicular to each other, so that one side of the straight line where the main light emitted by the first light source 11 is located passes through the first light selection component 15, the second light selection component 16 and the second light source 12. Figure 2 In the illustrated embodiment, the first light source 11 and the second light source 12 are arranged on opposite sides of the first light selection component 15 and the second light selection component 16. The first light source 11 and the second light source 12 do not occupy the space of the light source module 10 in the direction parallel to the light emitting surface, which is beneficial to compressing the size of the light source module 10 in the direction parallel to the light emitting surface of the first light source 11 and the second light source 12, so that the light source module 10 can better adapt to the spatial layout of the light emitting device 30 or the display device, and compress the volume of the light emitting device 30 or the display device.

[0052] It is understandable that in Figure 2 In the embodiment shown, among the light emitted by the first light source 11, the first color light in the first polarization state ( Figure 2 The light P shown R1 ) passes through the first light selection component 15 and is emitted to the second light selection component 16, and then is reflected by the second light selection component 16 and then emitted from the light source module 10. The first color light in the second polarization state ( Figure 2 The light S shown R ) is reflected by the first light selection component 15 to the first polarization conversion component 13, and is converted by the first polarization conversion component 13 into a first color light in a first polarization state ( Figure 2 The light P shownR2 ), and then emitted from the light source module 10 through the first light selection component 15. Among the light emitted by the second light source 12, the second color light in the first polarization state ( Figure 2 The light P shown GB1 ) passes through the second light selection component 16 and is incident on the first light selection component 15, so that the light P passing through the first light selection component 15 is reflected by the first light selection component 15. R2 The mixed light is emitted from the light source module 10. The second color light in the second polarization state ( Figure 2 The light S shown GB ) is reflected by the second light selection component 16 to the second polarization conversion component 14, and is converted by the second polarization conversion component 14 into a second color light in the first polarization state ( Figure 2 The light P shown GB2 ) and reflected back to the second light selection component 16, and then through the second light selection component 16, and the light P reflected by the second light selection component 16 R1 The mixed emission light source module 10 .

[0053] The relative angles of the components in the light source module 10 are not limited, as long as the corresponding light paths can be realized. For example, in some embodiments, the first light selection component 15 and the second light selection component 16 are perpendicular to each other, that is, the extension direction of the film layer and the polarization element in the first light selection component 15 is perpendicular to the extension direction of the film layer and the polarization element in the second light selection component 16. The first light selection component 15 forms an angle of 45° with the light emitting direction of the first light source 11 and the straight line perpendicular to the reflective surface of the first polarization conversion component 13, that is, the extension direction of the film layer and the polarization element in the first light selection component 15 forms an angle of 45° with the light emitting direction of the first light source 11 and the straight line perpendicular to the reflective surface of the first polarization conversion component 13. The second light selection component 16 forms a 45° angle with the light emitting direction of the second light source 12 and the straight line perpendicular to the reflective surface of the second polarization conversion component 14. That is, the extension direction of the film layer and the polarization element in the second light selection component 16 forms a 45° angle with the light emitting direction of the second light source 12 and the straight line perpendicular to the reflective surface of the second polarization conversion component 14. The light emitting directions of the first light source 11 and the second light source 12 are parallel to the reflective surfaces of the first polarization conversion component 13 and the second polarization conversion component 14.

[0054] The specific configuration of each light selection component and each polarization conversion component is not limited, as long as the corresponding light transmission, reflection or conversion can be achieved. For example, in some embodiments, the first light selection component 15 includes a first polarization element 151 and a first transflective film 152 that are stacked, and the second light selection component 16 includes a second polarization element 161 and a second transflective film 162. The first polarization element 151 and the second polarization element 161 can both transmit the first polarization state light and reflect the second polarization state light, the first transflective film 152 can transmit the first color light and reflect the second color light, and the second transflective film 162 can transmit the second color light and reflect the first color light.

[0055] refer to Figure 1 As shown, it can be understood that when the first polarizing element 151 is located on the side of the first transflective film 152 facing away from the first light source 11, and the second polarizing element 161 is located on the side of the second transflective film 162 facing away from the second light source 12, the light S incident on the first light selection component 15 R The light S will first pass through the first reflective film 152, then be reflected by the first polarizing element 151, and then pass through the first reflective film 152 again to the first polarization conversion component 13. Passing through the first reflective film 152 twice will easily increase the light loss. GB Therefore, in some embodiments, the first polarizing element 151 is designed to be located on the side of the first transflective film 152 facing the first light source 11, and the second polarizing element 161 is designed to be located on the side of the second transflective film 162 facing the second light source 12, so that the light S R When the light hits the first light selection component 15, it can be directly reflected by the first polarizing element 151 toward the first polarizing element 151 without passing through the first transflective film 152 twice. GB Similarly, it is helpful to reduce light loss and further improve the light output efficiency of the light source module 10 .

[0056] Figure 2 Similarly to the embodiment shown, the first polarizing element 151 can be arranged on the side of the first transflective film 152 facing away from the first light source 11, and the second polarizing element 161 can be arranged on the side of the second transflective film 162 facing away from the second light source 12. When the first polarizing element 151 is arranged on the side of the first transflective film 152 facing the first light source 11 and the second polarizing element 161 is arranged on the side of the second transflective film 162 facing the second light source 12, the loss of light can be effectively reduced and the light output efficiency of the light source module 10 can be improved.

[0057] The specific design of each transflective film and polarizing element is not limited, as long as the corresponding transmission and reflection functions can be achieved. In some embodiments, the first polarizing element 151 and the second polarizing element 161 can use polarizing plates with a transmittance of more than 90% for the first polarized light and a reflectance of more than 90% for the second polarized light. The first transflective film 152 can use a specific band filter film with a transmittance of more than 90% for the first color light and a reflectance of more than 90% for the second color light, and the second transflective film 162 can use a specific band filter film with a transmittance of more than 90% for the second color light and a reflectance of more than 90% for the first color light.

[0058] In some embodiments, the first polarization conversion component 13 includes a reflector 131 and a phase delay element 132 located between the reflector 131 and the first light selection component 15, and the second polarization conversion component 14 includes a reflector 131 and a phase delay element 132 located between the reflector 131 and the second light selection component 16. The surface of the reflector 131 facing the phase delay element 132 is the reflective surface of the first polarization conversion component 13 or the second polarization conversion component 14, and the phase delay element 132 includes but is not limited to a quarter wave plate. It can be understood that the second polarization state light is reflected by the light selection component to the polarization conversion component, and when passing through the phase delay element 132, a phase change occurs and the light is converted into circularly polarized light and incident on the reflector 131. When reflected by the reflector 131, a half-wave loss occurs, resulting in a change in the hand direction of the circularly polarized light, so that when passing through the phase delay element 132 again, the light is converted into the first polarization state light and incident on the light selection component.

[0059] It can be understood that when the first polarized light is P light and the second polarized light is S light, the light source module 10 is used to emit P light. In other embodiments, the first polarized light may also be S light and the second polarized light may also be P light. Then the first polarizing element 151 and the second polarizing element 161 are adapted to be polarizers that can transmit S light and reflect P light, and the light source module 10 is used to emit S light. The specific light output type can be designed according to actual lighting, projection or display requirements.

[0060] In some embodiments, the first color light is red light, and the second color light is green light and blue light, then the first light source 11 can be a red light source, and the second light source 12 can be a blue-green light source. In this arrangement, since the wavelengths of green light and blue light are closer to those of red light, the design difficulty and cost of the first transflective film 152 and the second transflective film 162 can be reduced, and it is beneficial to improve the corresponding transmittance and reflectivity of the first transflective film 152 and the second transflective film 162. In the present application, the wavelength of red light can be 647nm-760nm, the wavelength of green light can be 492nm-560nm, and the wavelength of blue light can be 430nm-455nm.

[0061] The arrangement of the first light selection component 15 and the second light selection component 16 in the light source module 10 is not limited, as long as they can be kept relatively fixed with other components to achieve the corresponding optical path design. For example, in some embodiments, the light source module 10 also includes a first prism 17, a second prism 18 and a third prism 19, and the first prism 17, the second prism 18 and the third prism 19 are all right-angle prisms. The two right-angled surfaces of the third prism 19 are respectively opposite to the inclined surface of the first prism 17 and the inclined surface of the second prism 18, the two right-angled surfaces of the first prism 17 are respectively opposite to the first light source 11 and the second polarization conversion component 14, and the two right-angled surfaces of the second prism 18 are respectively opposite to the second light source 12 and the second polarization conversion component 14. One of the first polarizing element 151 and the first transflective film 152 is disposed on the inclined surface of the first prism 17, and the other is disposed on the right angle surface of the third prism 19 opposite to the first prism 17. One of the second polarizing element 161 and the second transflective film 162 is disposed on the inclined surface of the second prism 18, and the other is disposed on the right angle surface of the third prism 19 opposite to the second prism 18. In other embodiments, the third prism 19 can also be formed by gluing two sub-prisms, both of which are right-angle triangular prisms, wherein the inclined surfaces of the two sub-prisms are respectively opposite to the inclined surfaces of the first prism 17 and the second prism 18, one of the right angle surfaces of the two sub-prisms is opposite and glued, and the other right angle surfaces of the two sub-prisms together constitute the light-emitting surface of the light source module 10. The number, structure and layout of the prisms can also have other designs, as long as they can provide a carrier for the first light selection component 15 and the second light selection component 16 and can realize the corresponding optical path design.

[0062] refer to Figure 3 As shown, in other embodiments, the light source module 10 further includes two glass plates 21, which are respectively arranged obliquely on the light exit paths of the first light source 11 and the second light source 12, the first polarizing element 151 and the first transflective film 152 are respectively arranged on the two opposite surfaces of the glass plate 21 located on the light exit path of the first light source 11, and the second polarizing element 161 and the second transflective film 162 are respectively arranged on the two opposite surfaces of the glass plate 21 located on the light exit path of the second light source 12. Providing the polarizing element and the transflective film on two carriers respectively, or on two surfaces of the same carrier, is conducive to reducing the difficulty of preparing the polarizing element and the transflective film, and improving the fixing strength between the polarizing element and the transflective film and the carrier. Figure 4 FIG. 1 is a schematic diagram showing a structure in which a light selection component is arranged on a glass plate 21 in one embodiment. In this embodiment, the light path of the light source module 10 can be as follows: Figure 2 The embodiment shown is obtained.

[0063] Further, it can be understood that the longer the transmission path of the light in the light source module 10 is, the greater the loss may be, resulting in weaker intensity. Figure 1 In the embodiment shown, the inclined surface of the third prism 19 is regarded as the light emitting surface of the light source module 10, wherein the light P R1 and light P GB2 The mixed light is emitted from the light emitting surface and the part obliquely opposite to the first light selection component 15, and the light P GB1 and light P R2 The mixed light is emitted from the portion of the light emitting surface that is obliquely opposite to the second light selection component 16. GB2 and light P R2 The transmission path in the light source module 10 is longer than the light P R1 and light P GB1 , resulting in the light P GB2 and light P R2 The intensity may be weaker than that of light P R1 and light P GB1 That is to say, among the light emitted from the portion of the light emitting surface corresponding to the first light selection component 15, the intensity of the second color light may be weaker than the first color light, and among the light emitted from the portion of the light emitting surface corresponding to the second light selection component 16, the intensity of the first color light may be weaker than the second color light.

[0064] To avoid the color shift caused by the different intensities of light of different colors, which affects the light output quality of the light source module 10. In some embodiments, the light source module 10 further includes a first color filter 22 and a second color filter 23. The first color filter 22 is disposed on the light output path of the first light selection component 15 corresponding to the light of the first polarization state, for example, disposed on a portion where the light output surface is obliquely opposite to the first light selection component 15. The second color filter 23 is disposed on the light output path of the second light selection component 16 corresponding to the light of the first polarization state, for example, disposed on a portion where the light output surface is obliquely opposite to the second light selection component 16. The first color filter 22 can transmit the second color light and reduce part of the first color light to reduce the light P R1 and light P GB2 The second color filter 23 can transmit the first color light and reduce part of the second color light to reduce the intensity difference between the light P and the second color light. R2 and light P GB1 Thus, the intensity difference between the light of different colors emitted from various places on the light emitting surface can be reduced, the color uniformity of the light emitted by the light source module 10 can be improved, and the display or lighting quality can be improved.

[0065] It should be noted that the light source module 10 described in any of the above embodiments can be used alone in the light emitting device 30, that is, in an optical machine of any applicable display device such as an AR device or a projection device, and the light emitting device 30 can include a housing, and the light source module 10 is arranged in the housing. The light source module 10 can emit polarized light mixed with multiple colors, which can meet the needs of display, lighting or projection.

[0066] Furthermore, combined with Figure 5 and Figure 6 As shown, in some embodiments, a light emitting device 30 may include a plurality of light source modules 10, and the plurality of light source modules 10 may be arranged in an array on a substrate 31. Figure 5 and Figure 6 In the illustrated embodiment, only the array arrangement of the first light source 11 and the second light source 12 on the substrate 31 is schematically illustrated, and the first light source 11 and the second light source 12 are distinguished by different section lines. The first light source 11 and the second light source 12 can be arranged in a 2*2 array, and the light emitting device 30 is provided with two light source modules 10, each of which is composed of two adjacent first light sources 11 and second light sources 12, and the first light selection component 15 and the second light selection component 16 in each light source module 10 are respectively tilted relative to the adjacent first light source 11 and the second light source 12. Of course, the number of light source modules 10 is not limited to the description of this application, for example, the first light source 11 and the second light source 12 can also be arranged in any applicable array such as 4*4, 8*8, etc., and the number of light source modules 10 is half of the sum of the number of the first light source 11 and the second light source 12, which can be specifically designed according to display, projection or lighting requirements.

[0067] A plurality of light source modules 10 arranged in an array are provided in the light emitting device 30, and the plurality of light source modules 10 can emit light at the same time, effectively improving the display brightness and meeting the high-power display requirements. At the same time, different light source modules 10 can emit light separately, or the light emission intensities of the first light source 11 and the second light source 12 in different light source modules 10 can be different, so that local display or different display brightness at different positions can be achieved, so as to meet various dimming requirements.

[0068] refer to Figure 5 As shown, in some embodiments, any first light source 11 is adjacent to other first light sources 11 in one of the first direction and the second direction, and is adjacent to the second light source 12 in the second direction. Figure 5 In the embodiment shown, the light source modules 10 are arranged in the same direction. The first direction and the second direction may be two mutually perpendicular directions on a plane parallel to the substrate 31, and the first direction and the second direction may be the horizontal and vertical directions of the arrangement array of the first light source 11 and the second light source 12. Figure 5In the illustrated embodiment, the light source module 10 is placed in the longitudinal direction, and a plurality of light source modules 10 are arranged in sequence in the transverse direction.

[0069] refer to Figure 6 As shown, in other embodiments, any first light source 11 is adjacent to the second light source 12 in both the first direction and the second direction. Similarly, any second light source 12 is adjacent to the first light source 11 in both the first direction and the second direction. Figure 6 In the illustrated embodiment, the light source module 10 can be placed in the horizontal direction, and multiple light source modules 10 are arranged in sequence in the longitudinal direction. The light source module 10 can also be placed in the longitudinal direction, and multiple light source modules 10 are arranged in sequence in the horizontal direction. Moreover, when multiple light source modules 10 are arranged in sequence along the first direction, the direction in which the first light source 11 of each light source module 10 points to the second light source 12 is parallel to and opposite to the direction in which the first light source 11 of another light source module 10 adjacent in the first direction points to the second light source 12. The same is true for multiple light source modules 10 arranged in sequence along the second direction. In this way, when the intensity of the first color light and the second color light in the emitted light of the light source module 10 relative to the first light source 11 are not completely equal, since the first light source 11 is adjacent to the second light source 12 in both the first and second directions, the emitted light of the adjacent light source modules 10 relative to the first light source 11 and the second light source 12 is adjacent, which can form a mixing effect, so that the intensity of the first color light and the second color light in the mixed light is equal, effectively improving the light uniformity and display quality of the light emitting device 30.

[0070] The present application also provides a display device, including the light source module 10 described in any of the above embodiments, or including the light emitting device 30 described in any of the above embodiments. When the display device includes the light source module 10, a single light source module 10 can play a role in providing lighting, projection or display light in the display device alone. When the display device includes the light emitting device 30, the light emitting device 30 can be provided with a plurality of light source modules 10 arranged in an array, so that the display device can achieve dimming effects such as local luminescence or different luminous intensities in different parts. The display device may include any applicable reflective modulation element such as a silicon-based liquid crystal chip, and the display device may also include an optical transmission element for transmitting the light emitted by the light source module 10 or the light emitting device 30 to the reflective modulation element, and for transmitting the light reflected by the reflective modulation element to the display device for display or projection. The specific structural composition, layout and optical path design of the display device are not limited, as long as the light emitted by the light source module 10 or the light emitting device 30 can be emitted after being modulated by the reflective modulation element. The specific structure and optical path design of the display device are not limited in the present application.

[0071] In some embodiments, the light source module 10 further includes two collimators 24, one of which is disposed between the first light source 11 and the first light selection component 15, and the other collimator 24 is disposed between the second light source 12 and the second light selection component 16. The collimator 24 may include one or more lenses with optical power, or a Fresnel lens composed of a glass substrate and a silicone lens, or a Fresnel microlens array, to further reduce the size of the light source module 10. The collimator 24 can collimate the light emitted by the light source so that the incident angles of the light at various locations on the light selection component are the same, which is beneficial to improving the transmittance or reflectivity of the light selection component to the light.

[0072] In other embodiments, when multiple light source modules 10 are arranged in an array in the light emitting device 30, the light emitting device 30 may also replace the collimating mirrors 24 in the multiple light source modules 10 with a collimating mirror. The collimating mirror in the light emitting device 30 is arranged between all the light selection components and all the first light sources 11 and the second light sources 12, and the projection of the collimating mirror on the substrate 31 covers all the first light sources 11 and the second light sources 12. The collimating mirror is used to collimate the light emitted by the multiple first light sources 11 and then emit it to the corresponding first light selection component 15, and collimate the light emitted by the multiple second light sources 12 and then emit it to the corresponding second light selection component 16. As a result, multiple light source modules 10 share one collimating mirror in the light emitting device 30, which can reduce the preparation process and preparation cost of the light emitting device 30.

[0073] The light source module 10, light output device 30 or display device described in any of the above embodiments may also include other components to achieve richer functions or better display quality. The above components may also be replaced by other components as long as the corresponding functions can be achieved, which will not be elaborated in this application.

[0074] 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.

[0075] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A light source module, characterized in that: include: A first light source, used to emit light of a first color; A second light source, used to emit a second color light whose color is different from the first color light; A first polarization conversion component and a second polarization conversion component, wherein the first polarization conversion component and the second polarization conversion component are both capable of reflecting and converting the second polarization state light into the first polarization state light; a first light selection component, one side of which is obliquely opposite to the first light source and the first polarization conversion component, and comprises a first polarization element and a first transflective film, the first polarization element being capable of transmitting light of a first polarization state and reflecting light of a second polarization state, the first transflective film being capable of transmitting light of the first color and reflecting light of the second color; and, A second light selection component, one side of the second light selection component is obliquely opposite to the second light source and the second polarization conversion component, the side of the second light selection component facing away from the second light source corresponds to the side of the first light selection component facing away from the first light source, the second light selection component includes a second polarization element and a second transflective film, the second polarization element can transmit the first polarization state light and reflect the second polarization state light, the second transflective film can transmit the second color light and reflect the first color light.

2. The light source module according to claim 1, characterized in that: The first polarizing element is located on a side of the first transflective film facing the first light source, and the second polarizing element is located on a side of the second transflective film facing the second light source.

3. The light source module according to claim 1, characterized in that: The light source module also includes a first prism, a second prism and a third prism, all of which are right-angle prisms. The two right-angle surfaces of the third prism are respectively opposite to the inclined surfaces of the first prism and the second prism. The two right-angle surfaces of the first prism are respectively opposite to the first light source and the first polarization conversion component. The two right-angle surfaces of the second prism are respectively opposite to the second light source and the second polarization conversion component. One of the first polarizing element and the first transflective film is arranged on the inclined surface of the first prism, and the other is arranged on the right-angle surface of the third prism. One of the second polarizing element and the second transflective film is arranged on the inclined surface of the second prism, and the other is arranged on the right-angle surface of the third prism.

4. The light source module according to claim 1, characterized in that: The light source module also includes two glass plates, which are respectively arranged obliquely on the light output paths of the first light source and the second light source, the first polarizing element and the first transflective film are respectively arranged on the two opposite surfaces of one of the glass plates, and the second polarizing element and the second transflective film are respectively arranged on the two opposite surfaces of the other glass plate.

5. The light source module according to claim 1, characterized in that: The first light selection component and the second light selection component are perpendicular to each other, and light emitting directions of the first light source and the second light source are parallel to the reflecting surfaces of the first polarization conversion component and the second polarization conversion component.

6. The light source module according to claim 5, characterized in that: The first polarization conversion component and the second polarization conversion component are located on opposite sides of the first light selection component and the second light selection component, the first light source and the second light source are located on the same side of the first light selection component and the second light selection component, and the positions of the first light selection component and the second light selection component in the light emitting direction of the first light source correspond to each other.

7. The light source module according to claim 5, characterized in that: The first light source and the second light source are located on opposite sides of the first light selection component and the second light selection component, the first polarization conversion component and the second polarization conversion component are located on the same side of the first light selection component and the second light selection component, and the positions of the first light selection component and the second light selection component in a direction perpendicular to the reflective surface of the first polarization conversion component correspond to each other.

8. The light source module according to any one of claims 1 to 7, characterized in that: The first polarization conversion component includes a reflector and a phase delay element located between the reflector and the first light selection component, and the second polarization conversion component includes a reflector and a phase delay element located between the reflector and the second light selection component.

9. The light source module according to any one of claims 1 to 7, characterized in that: The first color light includes red light, and the second color light includes green light and blue light; and / or, The polarization directions of the first polarization state light and the second polarization state light are perpendicular to each other, and the polarization plane of one of the first polarization state light and the second polarization state light is perpendicular to the light propagation direction.

10. The light source module according to any one of claims 1 to 7, characterized in that: The light source module also includes a first color filter film and a second color filter film. The first color filter film is arranged on the light exit path of the first polarized state light corresponding to the first light selection component. The first color filter film can transmit the second color light and attenuate part of the first color light. The second color filter film is arranged on the light exit path of the second light selection component corresponding to the first polarized state light. The second color filter film can transmit the first color light and attenuate part of the second color light.

11. A light emitting device, characterized in that: It comprises a substrate and a plurality of light source modules according to any one of claims 1 to 10, wherein the plurality of light source modules are arranged in an array on the substrate.

12. The light emitting device according to claim 11, characterized in that: In an array formed by a plurality of the light source modules, a plurality of the first light sources and a plurality of the second light sources are arranged in an array, and any one of the first light sources is adjacent to other first light sources and second light sources in a first direction and a second direction respectively, or any one of the first light sources is adjacent to a second light source in both the first direction and the second direction, and the first direction and the second direction are two mutually perpendicular directions on a plane parallel to the substrate.

13. The light emitting device according to claim 11, characterized in that: The first light sources and the second light sources are arranged on the substrate in a matrix of 2*2, 4*4 or 8*8.

14. The light emitting device according to claim 11, characterized in that: The directions in which the first light sources of the plurality of light source modules point to the second light sources are parallel to each other, parallel to the first direction, and perpendicular to the second direction. The first direction and the second direction are two perpendicular directions on a plane parallel to the substrate.

15. The light emitting device according to claim 11, characterized in that: The light source module further includes two collimating lenses, and the two collimating lenses are respectively opposite to the first light source and the second light source; Alternatively, the light emitting device comprises a collimator, which is disposed on the light emitting sides of the first light source and the second light source, and the projection of the collimator on the substrate covers a plurality of the first light sources and a plurality of the second light sources.

16. A display device, characterized in that: It comprises the light source module as described in any one of claims 1 to 10, or the light emitting device as described in any one of claims 11 to 15.

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