Optical device
By using a polarization spectroscopic layer and a phase retardation element in an optical device, the filtered light beam is recovered and utilized, and the problems of light quantity loss and device volume weight in the prior art are solved, and the effect of improving brightness and efficiency is achieved.
Patent Information
- Application Number
- CN202510005172.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2024-09-26
- Filing Date
- 2025-01-02
- Publication Date
- 2025-03-07
AI Technical Summary
Existing optical devices lose about half of the amount of light when filtering through polarizers, resulting in reduced brightness and reduced lighting efficiency, while optical lenses increase the volume and weight of the device.
An optical device is designed, including a light source, a polarization spectroscopic layer, a phase retardation element and a lens. The polarization spectroscopic layer divides the beam into two parts, and the phase retardation element converts the beam with a vertical polarization direction into a beam with the same polarization direction, and combines the two parts of the beam through the lens.
By recovering the beams with different polarization directions filtered by the filter, the system brightness and lighting efficiency are improved, and the number of lens usage and optical space are reduced, reducing the volume and weight of the device.
Smart Images
Figure CN119575687A_ABST
Abstract
Description
Technical Field
[0001] An embodiment of the present invention relates to an optical device. Background Art
[0002] Light-emitting devices, such as light-emitting diodes, are widely used in various optical devices. In order to make the light-emitting device emit light with a single polarization direction, a polarizing film is generally used to filter the light to obtain polarized light with a specific polarization direction. However, filtering the light through a polarizing film will lose about half of the light, thereby reducing the brightness and lighting efficiency. In addition, the light beam usually needs to use an optical lens to expand the light-emitting area, which will increase the volume and weight of the light-emitting device. Summary of the invention
[0003] Some embodiments of the present invention provide an optical device, comprising: a light source for emitting a light beam; a polarization splitting layer, located on the optical path of the light beam, splitting the light beam into a first light beam and a second light beam, wherein the first light beam penetrates the polarization splitting layer, and the second light beam is reflected by the polarization splitting layer, wherein the first light beam has a first polarization direction, and the second light beam has a second polarization direction perpendicular to the first polarization direction; a phase delay element, located on the optical path of the second light beam, wherein the second light beam passes through the phase delay element at least once to become a third light beam with the first polarization direction; and a lens, located on the optical path of the first light beam and the optical path of the third light beam, wherein the first light beam and the third light beam penetrate the lens respectively.
[0004] The optical device described in the embodiment of the present invention can recycle the light beams with different polarization directions filtered out by the filter to improve the system brightness and lighting efficiency. It can also reduce the number of lenses used and reduce the optical space, thereby reducing the volume of the light source device and reducing the overall weight. BRIEF DESCRIPTION OF THE DRAWINGS
[0005] Figure 1 is a schematic diagram of an optical device according to some embodiments of the present invention;
[0006] Figure 2 is a schematic diagram of an optical device according to some embodiments of the present invention;
[0007] Figure 3 is a schematic diagram of an optical device according to some embodiments of the present invention;
[0008] Figure 4 is a schematic diagram of an optical device according to some embodiments of the present invention;
[0009] Figure 5 is a schematic diagram of an optical device according to some embodiments of the present invention;
[0010] Figure 6 is a schematic diagram of an optical device according to some embodiments of the present invention;
[0011] Figure 7 is a schematic diagram of an optical device according to some embodiments of the present invention;
[0012] Fig. 8A , Figure 8B , Figure 8C are schematic diagrams of optical devices according to embodiments of the present invention;
[0013] Fig.9A , Fig. 9B , Fig. 9C They are schematic diagrams of optical devices according to embodiments of the present invention. DETAILED DESCRIPTION
[0014] The following examples are listed and described in detail with the accompanying drawings, but the examples provided are not intended to limit the scope of the present invention. In addition, the element sizes in the drawings are drawn for the convenience of explanation and do not represent the actual element size ratio. Moreover, although the words "first", "second", etc. are used in the text to describe different elements and / or film layers, these elements and / or film layers should not be limited to these terms. Instead, these terms are only used to distinguish one element or film layer from another element or film layer. Therefore, the first element or film layer discussed below can be referred to as the second element or film layer without violating the teachings of the embodiments. For ease of understanding, similar elements will be described below with the same symbols.
[0015] Different examples in the description of the embodiments of the present invention may use repeated reference symbols and / or words. These repeated symbols or words are for the purpose of simplification and clarity, and are not used to limit the relationship between the various embodiments and / or the described appearance structures. Furthermore, if the following invention content of this specification describes that a first feature is formed on or above a second feature, it means that it includes an embodiment in which the formed first feature and the second feature are in direct contact, and also includes an embodiment in which an additional feature is formed between the first feature and the second feature, so that the first feature and the second feature may not be in direct contact. For ease of understanding, similar elements will be described below with the same symbols.
[0016] Figure 1 is a schematic diagram of an optical device according to some embodiments of the present invention.
[0017] Please refer to Figure 1 The optical device 100 includes a light source 110 , a polarization splitting layer 120 , a phase delay element 130 , and a lens 160 .
[0018] The light source 110 is used to emit a light beam L. The light beam L emitted by the light source 110 is a non-polarized light and does not have a specific polarization direction.
[0019] In some embodiments, the light source 110 is a white light LED or a monochromatic LED, or a light emitting element having similar characteristics, but the present disclosure is not limited thereto. In some embodiments, the light beam L is white light or monochromatic light, wherein the monochromatic light is, for example, red light, green light, or blue light, but the present disclosure is not limited thereto.
[0020] The polarization splitting layer 120 is located on the optical path of the light beam L, and splits the light beam L into a first light beam L1 and a second light beam L2, wherein the first light beam L1 penetrates the polarization splitting layer 120, and the second light beam L2 is reflected by the polarization splitting layer 120, wherein the first light beam L1 has a first polarization direction, and the second light beam L2 has a second polarization direction perpendicular to the first polarization direction.
[0021] Specifically, the polarization splitting layer 120 allows the first light beam L1 with a first polarization direction to pass through, and reflects the second light beam L2 with a second polarization direction, thereby achieving the effect of generating polarized light, namely, the first light beam L1 with the first polarization direction.
[0022] In some embodiments, the first polarization direction is one of the P polarization direction or the S polarization direction, and the second polarization direction is the other of the P polarization direction or the S polarization direction. Therefore, the phase difference between the first polarization direction and the second polarization direction is 90 degrees. The selection of the specific polarization direction is determined according to the actual application requirements, and the present invention is not limited thereto.
[0023] In some embodiments, the polarization splitting layer 120 may be a multi-layer optical coating, a wire grid polarizer (WGP), or a reflective polarizing film, or other optical elements with similar functions, but the present invention is not limited thereto.
[0024] The phase delay element 130 is located on the optical path of the second light beam L2. The second light beam L2 passes through the phase delay element 130 at least once to become a third light beam L3 with a first polarization direction.
[0025] The lens 160 is located on the optical path of the first light beam L1 and the optical path of the third light beam L3 , wherein the first light beam L1 and the third light beam L3 respectively pass through the lens 160 .
[0026] In this embodiment, the lens may be a lens with a light-gathering or light-scattering effect, such as a convex lens or a concave lens or other optical elements with similar optical properties, but the present disclosure is not limited thereto.
[0027] Specifically, the optical device 100 further includes a first reflective element 140 located on the optical path of the second light beam L2, and a second reflective element.
[0028] The first reflective element 140 is located on the optical path of the second light beam L2. In some embodiments, the first reflective element 140 is a reflector, or an optical element with similar optical characteristics, but the present invention is not limited thereto.
[0029] The second reflective element 150 is located on the optical path of the third light beam L3. In some embodiments, the second reflective element 150 is an optical film with reflective properties, or an optical element with similar optical characteristics, but the present invention is not limited thereto.
[0030] After passing through the phase delay element 130 , the second light beam L2 is reflected by the first reflection element 140 and passes through the phase delay element 130 again, so that the second light beam L2 becomes a third light beam L3 with the first polarization direction.
[0031] In this embodiment, the phase delay element 130 is a quarter wave plate, so when the second light beam L2 passes through the phase delay element 130 , the phase of the second light beam L2 will increase or decrease by 45 degrees.
[0032] Therefore, when the second light beam L2 passes through the quarter wave plate, is reflected by the first reflective element 140, and then passes through the quarter wave plate again, the phase of the second light beam L2 increases or decreases by 90 degrees because it passes through the quarter wave plate twice. Therefore, the second light beam L2 with the second polarization direction becomes the third light beam L3 with the first polarization direction.
[0033] like Figure 1 As shown, the optical device 100 further includes a prism 170. The prism 170 is an isosceles right triangle, and has a first vertical surface 1701, a second vertical surface 1702, and an inclined surface 1703. The polarization splitting layer 120 is located on the first vertical surface 1701 of the prism 170, the second reflecting element 150 is located on the second vertical surface 1702 of the prism 170, and the lens 160 is located on the inclined surface 1703 of the prism 170.
[0034] In some embodiments, the polarization splitting layer 120 can be mounted on the first vertical surface 1701 by gluing, or an optical film can be coated on the first vertical surface 1701 by coating. The second reflective element 150 can be mounted on the second vertical surface 1702 by gluing a highly reflective optical film, or an optical film can be coated on the second vertical surface 1702 by coating. The lens 160 can be mounted on the third vertical surface 1703 by gluing.
[0035] Therefore, after the first light beam L1 passes through the polarization splitting layer 120 , the first light beam L1 passes through the prism 170 and passes through the lens 160 .
[0036] On the other hand, the third light beam L3 with the first polarization direction passes through the polarization splitting layer 120 , passes through the prism 170 , is reflected by the second reflective element 150 , has the same traveling direction as the first light beam L1 , and passes through the lens 160 .
[0037] At this time, the first light beam L1 and the third light beam L3 passing through the lens 160 both have the same polarization direction, ie, the first polarization direction.
[0038] Therefore, through Figure 1 In the optical device 100 shown, the second light beam L2 reflected by the polarization splitting layer 120 can be transformed into a third light beam L3 with a first polarization direction by passing through the phase delay element 130 (i.e., a quarter-wave plate) twice. Therefore, the light output amount and the light beam area can be effectively increased, and the lighting efficiency of the optical device can be improved.
[0039] Figure 2 is a schematic diagram of an optical device according to some embodiments of the present invention.
[0040] Please refer to Figure 2 . Figure 2 The optical device 200 shown is Figure 1 The optical device 100 shown is similar, so the same parts are not described again.
[0041] Figure 2 The optical device 200 shown is Figure 1 The difference of the optical device 100 shown is that in the optical device 200, the phase delay element 130 of the optical device 100 is changed into a phase delay element 230, and the first reflective element 140 is changed into a first reflective element 240. Specifically, in this embodiment, the phase delay element 230 is a liquid crystal film, and the second reflective element 240 is a substrate, and the phase delay element 230 and the second reflective element 240 constitute a liquid crystal on silicon (LCOS) panel. By applying a voltage to the phase delay element 230 (i.e., the liquid crystal film), the phase delay element 230 (i.e., the liquid crystal film) can have the same effect as a quarter wave plate, and can be used to change the phase of the second light beam.
[0042] Therefore, the second light beam L2 passes through the phase delay element 230 (ie, the liquid crystal film), is reflected by the first reflective element 240, and then passes through the phase delay element 230 (ie, the liquid crystal film) again to become the third light beam L3 with the first polarization direction, and is transmitted along the same polarization direction as the first reflective element 240. Figure 1 A similar light path enters lens 160 .
[0043] Figure 3 is a schematic diagram of an optical device according to some embodiments of the present invention.
[0044] Please refer to Figure 3 . Figure 3 The optical device 300 is shown with Figure 1 The optical device 100 shown is similar, so the same parts are not described again.
[0045] Figure 3 The optical device 300 is shown with Figure 1 The difference between the optical device 100 shown in FIG. 3 is that in the optical device 300, the prism 170 of the optical device 100 is changed into an L-shaped glass 370. Figure 3 As shown, the L-shaped glass 370 includes a first surface 3701 and a second surface 3702 that are perpendicular to each other, wherein the polarization splitting layer 120 is located on the first surface 3701, and the second reflecting element 150 is located on the second surface 3702. Specifically, the splitting layer 120 is located on the side of the first surface 3701 facing the phase delay component 130, and the second reflecting component 150 is located on the side of the second surface 3702 facing the first surface 3701. After being reflected by the second reflecting element 150, the third light beam L3 has the same traveling direction as the first light beam L1.
[0046] Specifically, if Figure 3 As shown, after the first light beam L1 passes through the polarization splitting layer 120 and the first surface 3701 of the L-shaped glass 370 in sequence, it passes through the air layer and then enters the lens 160 .
[0047] On the other hand, Figure 3 As shown, after leaving the phase delay element 130 , the third light beam L3 passes through the polarization splitting layer 120 and the first surface 3701 of the L-shaped glass 370 in sequence, passes through the air layer, is reflected by the second reflective element 150 , passes through the air layer again, and then enters the lens 160 .
[0048] Since the second reflective component 150 is located on the side of the second surface 3702 facing the first surface 3701, the third light beam L3 will not pass through the second surface 3702 and generate additional loss. Therefore, by using the L-shaped glass 370, the weight of the optical device 300 can be effectively reduced. In addition, since the optical paths of the first light beam L1 and the third light beam L3 before entering the lens must pass through the air layer, compared with the optical device 100, the optical paths of the first light beam L1 and the third light beam L3 before entering the lens must pass through the prism 170, which can reduce the loss of the first light beam L1 and the third light beam L3 in the prism 170 due to passing through the medium.
[0049] Figure 4is a schematic diagram of an optical device according to some embodiments of the present invention.
[0050] Please refer to Figure 4 The optical device 400 includes a light source 110, a polarization beam splitting layer 120, a phase delay element 130, a first reflective element 140, a second reflective element 150, and a lens 160. The above elements have been described in the above embodiments and will not be described again.
[0051] The optical device 400 further includes a first prism 470A, a second prism 470B, and a third prism 470C.
[0052] The first vertical surface 470A1 of the first prism 470A is the light incident surface of the light beam L. The second vertical surface 470A2 of the first prism 470A is connected to the phase delay element 130 . The inclined surface 470A3 of the first prism 470A is connected to the polarization splitting layer 120 .
[0053] The first vertical surface 470B1 of the second prism 470B is connected to the lens 160 , the second vertical surface 470B2 of the second prism 470B is connected to the first vertical surface 470C1 of the third prism 470C, and the inclined surface 470B3 of the second prism 470B is connected to the polarization splitting layer 120 .
[0054] The second vertical surface 470C2 of the third prism 470C is connected to the lens 160, and the inclined surface 470C3 of the third prism 470C is connected to the second reflective element 150.
[0055] After being reflected by the second reflective element 150 , the third light beam L3 has the same traveling direction as the first light beam L1 .
[0056] Therefore, when the light beam L enters the first prism 470A from the first vertical surface 470A1 of the first prism 470A, it is split into a first light beam L1 with a first polarization direction and a second light beam L2 with a second polarization direction at the inclined surface 470A3 of the first prism 470A and the inclined surface 470B3 of the second prism 470B by the polarization splitting layer 120.
[0057] The first light beam L1 passes through the second prism 470B and enters the lens 160 through the first vertical surface 470B1 of the second prism 470B.
[0058] The second light beam L2 is reflected by the polarization splitting layer 120, passes through the first prism 470A, and enters the phase delay element 130 through the second vertical surface 470A2 of the first prism 470A. After passing through the phase delay element 130, the second light beam L2 is reflected by the first reflection element 140 and passes through the phase delay element 130 again, so that the second light beam L2 becomes a third light beam L3 with the first polarization direction.
[0059] The third light beam L3 with the first polarization direction enters the first prism 470A from the second vertical surface 470A2 of the first prism 470A, passes through the polarization splitting layer 120, sequentially passes through the second prism 470B and the third prism 470C, is reflected by the second reflective element 150, and enters the lens 160 from the second vertical surface 470C2 of the third prism 470C.
[0060] At this time, the first light beam L1 and the third light beam L3 passing through the lens 160 both have the same polarization direction, ie, the first polarization direction.
[0061] In this embodiment, the first prism 470A, the second prism 470B, and the third prism 470C have the same shape, which are all isosceles right triangles.
[0062] In this embodiment, the optical device 400 further includes a fourth prism 470D. An inclined surface 470D3 of the fourth prism 470D is connected to the second reflective element 150 .
[0063] In this embodiment, the fourth prism 470D has the same shape as the first prism 470A, the second prism 470B, and the third prism 470C.
[0064] Since the first prism 470A, the second prism 470B, the third prism 470C and the fourth prism 470D all have the same shape and are isosceles right triangles, the first prism 470A and the second prism 470B can form a cube, and the third prism 470C and the fourth prism 470D can form a cube, thereby effectively fixing the relative positions of the polarization splitting layer 120, the phase delay element 130, the first reflection element 140, the second reflection element 150, and the lens 160 in the optical device 400.
[0065] In some embodiments, the light source 110 may be directly attached to the first vertical surface 470A1 of the first prism 470A, so that the optical path of the light beam L does not need to pass through the air layer and directly enters the first prism 470A.
[0066] Figure 5 is a schematic diagram of an optical device according to some embodiments of the present invention.
[0067] Please refer to Figure 5 . Figure 5 The optical device 500 is shown with Figure 4 The optical device 400 shown is similar, so the same parts are not repeated again.
[0068] Figure 5 The optical device 500 is shown with Figure 4The difference between the optical device 400 shown is that the fourth prism 470D is not included in the optical device 500. That is, the optical device 400 has four prisms of the same shape, while the optical device 500 has three prisms of the same shape.
[0069] Since the fourth prism 470D is not on the optical path of the third light beam L3 , the optical device 500 has the same optical path as the optical device 400 .
[0070] Since the optical device 500 has only three prisms, the weight of the optical device 500 can be effectively reduced and the available space can be increased compared to the optical device 400. However, since the third prism 470C lacks the corresponding fourth prism 470D, the protection of the second reflective element 150 may be reduced.
[0071] Figure 6 is a schematic diagram of an optical device according to some embodiments of the present invention.
[0072] Please refer to Figure 6 The optical device 600 includes a light source 110, a polarization beam splitting layer 120, and a lens 160. The above elements have been described in the above embodiments and will not be described again herein.
[0073] The optical device 600 further includes a reflective element 640 and a phase delay element 630 .
[0074] The phase delay element 630 is located on the optical path of the second light beam L2.
[0075] The reflective element 640 is located on the optical path of the second light beam L2.
[0076] After being reflected by the reflective element 640 , the second light beam L2 passes through the phase delay element 630 and becomes a third light beam L3 with the first polarization direction.
[0077] In this embodiment, the phase delay element 630 is a half-wave plate. Therefore, when the second light beam L2 with the second polarization direction passes through the phase delay element 630 (ie, the half-wave plate), it can become the third light beam L3 with the first polarization direction.
[0078] Therefore, relative to Figures 1 to 5 In the optical devices 100 , 200 , 300 , 400 , and 500 , the second light beam L2 needs to pass through the phase delay element 130 or 230 twice. In the optical device 600 , the second light beam L2 only needs to pass through the phase delay element 630 once, thereby reducing the loss of the second light beam L2 .
[0079] In addition, relative to Figures 1 to 5The optical devices 100, 200, 300, 400, and 500 shown in the figure all have the first reflective element 140 and the second reflective element 150, and the optical device 600 only needs one reflective element 640, so that the manufacturing cost can be reduced.
[0080] like Figure 6 As shown, the optical device 600 further includes: a first prism 670A, a second prism 670B, a third prism 670C and a fourth prism 670D.
[0081] The first vertical surface 670A1 of the first prism 670A is the light incident surface of the light beam L. The second vertical surface 670A2 of the first prism 670A is connected to the first vertical surface 670C1 of the third prism 670C. The inclined surface 670A3 of the first prism 670A is connected to the polarization splitting layer 120 .
[0082] The first vertical surface 670B1 of the second prism 670B is a light-emitting surface of the first light beam L1 , and the inclined surface 670B3 of the second prism 670B is connected to the polarization splitting layer 120 .
[0083] The second vertical surface 670C2 of the third prism 670C is connected to the phase delay element 630 , and the inclined surface 670C3 of the third prism 670C is connected to the reflective element 640 .
[0084] The inclined surface 670D3 of the fourth prism 670D is in contact with the reflective element 640 .
[0085] Therefore, when the light beam L enters the first prism 670A from the first vertical surface 670A1 of the first prism 670A, it is split into a first light beam L1 with a first polarization direction and a second light beam L2 with a second polarization direction by the polarization splitting layer 120 at the inclined surface 670A3 of the first prism 670A and the inclined surface 670B3 of the second prism 670B.
[0086] The first light beam L1 passes through the second prism 670B, and enters the lens 160 through the first vertical surface 670B1 of the second prism 670B through the air layer 680 .
[0087] The second light beam L2 is reflected by the polarization splitting layer 120, passes through the first lens 670A, and enters the third prism 670C through the second vertical surface 670A2 of the first prism 670A and the first vertical surface 670C1 of the third prism 670C. After being reflected by the reflective element 640, the second light beam L2 passes through the third prism 670C, and enters the phase delay element 630 through the second vertical surface 670C2 of the third prism 670C. After passing through the phase delay element 630, the second light beam L2 becomes the third light beam L3 with the first polarization direction, and enters the lens 160.
[0088] At this time, the first light beam L1 and the third light beam L3 passing through the lens 160 both have the same polarization direction, ie, the first polarization direction.
[0089] In this embodiment, the first prism 670A, the second prism 670B, the third prism 670C, and the fourth prism 670D have the same shape, which is an isosceles right triangle.
[0090] Since the first prism 670A, the second prism 670B, the third prism 670C and the fourth prism 670D all have the same shape and are isosceles right triangles, the first prism 670A and the second prism 670B can form a cube, and the third prism 670C and the fourth prism 670D can form a cube, thereby effectively fixing the relative positions of the polarization splitting layer 120, the phase delay element 630, and the reflection element 640 in the optical device 600.
[0091] Furthermore, in some embodiments, the lens 160 and the phase delay element 630 are bonded together, so that the relative position of the lens 160 in the optical device 600 can be fixed.
[0092] In some embodiments, the light source 110 may be directly attached to the first vertical surface 670A1 of the first prism 670A, so that the optical path of the light beam L does not need to pass through the air layer and directly enters the first prism 470A.
[0093] Figure 7 is a schematic diagram of an optical device according to some embodiments of the present invention.
[0094] Please refer to Figure 7 The optical device 700 includes a light source 110, a polarization beam splitting layer 120, and a lens 160. The above elements have been described in the above embodiments and will not be described again here.
[0095] The optical device 700 further includes a reflective element 740 and a phase delay element 730 .
[0096] The reflective element 740 is disposed on the substrate 750 and is located on the optical path of the second light beam L2.
[0097] The phase delay element 730 is disposed on the reflective element 740 and is located on the optical path of the second light beam L2.
[0098] The phase delay element 730 and the polarization splitting layer 120 may be separated by air or glass.
[0099] In addition, the phase delay element 730 and the reflective element 740 each have an opening 760 , wherein the light beam L enters the polarization splitting layer 120 through the opening 760 .
[0100] Therefore, the light source 110 emits a light beam L which enters the polarization splitting layer 120 through the opening 760 .
[0101] The polarization splitting layer 120 is located on the optical path of the light beam L, and splits the light beam L into a first light beam L1 and a second light beam L2, wherein the first light beam L1 penetrates the polarization splitting layer 120, and the second light beam L2 is reflected by the polarization splitting layer 120, wherein the first light beam L1 has a first polarization direction, and the second light beam L2 has a second polarization direction perpendicular to the first polarization direction.
[0102] The first light beam L1 passes through the polarization splitting layer 120 and passes through the lens 160 .
[0103] After being reflected by the polarization splitting layer 120 , the second light beam L2 enters and passes through the phase delay element 730 , and after being reflected by the reflection element 740 , passes through the phase delay element 730 again to become a third light beam L3 with the first polarization direction. The third light beam L3 passes through the polarization splitting layer 120 and the lens 160 in sequence.
[0104] In this embodiment, the phase delay element 730 is a quarter wave plate.
[0105] In this embodiment, the material of the substrate 750 can be plastic, glass, or a printed circuit board, but the present disclosure is not limited thereto. In some embodiments, the substrate 750 can also be a plastic shell shared with the mechanism component.
[0106] Therefore, relative to Figures 1 to 5 The optical devices 100, 200, 300, 400, and 500 shown in the figure all have the first reflective element 140 and the second reflective element 150, and the optical device 700 only needs one reflective element 740. Therefore, the optical path can be shortened, and the optical device 700 can be made thinner and lighter, thereby reducing the weight of the device and the manufacturing cost.
[0107] Fig. 8A , Figure 8B , Figure 8C They are schematic diagrams of optical devices according to embodiments of the present invention.
[0108] Please refer to Fig. 8A . Fig. 8A The optical device 800A shown is Figure 1 The optical device 100 shown is similar, so the same parts are not described again.
[0109] Fig. 8A The optical device 800A shown is Figure 1 The difference between the optical device 100 shown in FIG. 8 is that the optical device 800A further includes a quarter wave plate 810 located on the optical path of the first light beam L1 and the third light beam L3. Fig. 8AAs shown, the quarter wave plate 810 is located between the polarization splitting layer 120 and the lens 160 .
[0110] The quarter wave plate 810 is used to change the polarization directions of the first light beam L1 and the third light beam L3 from linear polarization to circular polarization, or from linear polarization to elliptical polarization, so as to change the polarization directions of the first light beam L1 and the third light beam L3 simultaneously.
[0111] Please refer to Figure 8B . Figure 8B The optical device 800B shown is Figure 4 The optical device 400 shown is similar, so the same parts are not repeated again.
[0112] Figure 8B The optical device 800B shown is Figure 4 The difference between the optical device 400 shown is that the optical device 800B further includes a quarter wave plate 810 disposed between the phase delay element 630 and the lens 160 .
[0113] Please refer to Figure 8C . Figure 8C The optical device 800C shown is Figure 7 The optical device 700 shown is similar, so the same parts are not repeated again.
[0114] Figure 8C The optical device 800C shown is Figure 7 The difference between the optical device 700 shown is that the optical device 800C further includes a quarter wave plate 810 disposed between the polarization splitting layer 120 and the lens 160 .
[0115] By configuring a quarter wave plate 810 in the optical devices 800A, 800B, and 800C, the polarization directions of the first light beam L1 and the third light beam L3 can be changed from linear polarization to circular polarization, or from linear polarization to elliptical polarization, so as to change the polarization directions of the first light beam L1 and the third light beam L3 at the same time.
[0116] FIG. 8A to FIG. 8C For some embodiments only, the quarter wave plate 810 may be arranged at Figures 1 to 7 Any optical device in, for example, configured as the last optical element before the first light beam L1 and the third light beam L3 enter the lens 160.
[0117] Fig.9A , Fig. 9B , Fig. 9C They are schematic diagrams of optical devices according to embodiments of the present invention.
[0118] Please refer to Fig.9A . Fig.9A The optical device 900A shown is Figure 1 The optical device 100 shown is similar, so the same parts are not described again.
[0119] Fig.9A The optical device 900A shown is Figure 1 The difference between the optical device 100 shown is that the optical device 900A further includes a rotating stage 910 for rotating the optical device along the light emitting direction of the first light beam L1 and the third light beam L3. The rotating stage 910 also includes a mechanism 920 on both sides, which is respectively connected to one side of the prism 170 and the first reflective component 140, so as to fix the optical path of the optical device 900A and stabilize the structure of the optical device 900A. In some embodiments, the material of the mechanism 920 can be plastic or metal, or have other similar functions, and the present invention is not limited thereto.
[0120] like Fig.9A As shown, the rotating stage 910 is connected to the light source 110. When the rotating stage 910 rotates, with the assistance of the mechanism 920, all optical elements of the optical device 900A except the rotating stage 910 can be driven to rotate together, so as to achieve the effect of changing the light emission directions of the first light beam L1 and the third light beam L3.
[0121] In some embodiments, the rotation angle of the rotating stage can be controlled by a user, or the rotation angle can be automatically controlled by a processor (not shown) according to timing requirements to generate linearly polarized light in a desired polarization direction.
[0122] Please refer to Fig. 9B . Fig. 9B The optical device 900B shown is Figure 4 The optical device 400 shown is similar, so the same parts are not repeated again.
[0123] Fig. 9B The optical device 900B shown is Figure 4 The difference between the optical device 400 shown is that in the optical device 900B, the light source 110 is connected to the first prism 470A. In addition, the optical device 900B further includes a rotating stage 910 for rotating the optical device along the light emitting direction of the first light beam L1 and the third light beam L3. The rotating stage 910 also includes mechanism components 920 on both sides, one of which is connected to the side wall of the light source 110, the prism 670B, and the lens 160, and the other of which is connected to the prism 670D, the side wall of the phase delay element 630, and the side wall of the lens 160, so as to fix the optical path of the optical device 900B and stabilize the structure of the optical device 900B. In some embodiments, the material of the mechanism component 920 can be plastic or metal, or have other similar functions, and the present invention is not limited thereto.
[0124] like Fig. 9BAs shown, the rotating stage 910 is connected to the light source 110. When the rotating stage 910 rotates, with the assistance of the mechanism 920, all optical elements of the optical device 900B except the rotating stage 910 can be driven to rotate together, so as to achieve the effect of changing the light emission directions of the first light beam L1 and the third light beam L3.
[0125] Please refer to Fig. 9C . Fig. 9C The optical device 900C shown is Figure 7 The optical device 700 shown is similar, so the same parts are not repeated again.
[0126] Fig. 9C The optical device 900C shown is Figure 7 The difference between the optical device 700 shown is that the optical device 900C further includes a rotating stage 910 for rotating the optical device along the light emitting direction of the first light beam L1 and the third light beam L3. The rotating stage 910 also includes a mechanism 920 on both sides. The mechanism 920 is connected to the side wall of the polarization beam splitting layer 120, the side wall of the phase delay element 730, the side wall of the reflective element 740, the side wall of the substrate 750, and the lens 160 to fix the optical path of the optical device 900C and stabilize the structure of the optical device 900C. In some embodiments, the material of the mechanism 920 can be plastic or metal, or have other similar functions, and the present invention is not limited thereto.
[0127] like Fig. 9C As shown, the rotating stage 910 is connected to the light source 110. When the rotating stage 910 rotates, with the assistance of the mechanism 920, all optical elements of the optical device 900C except the rotating stage 910 can be driven to rotate together, so as to achieve the effect of changing the light emission directions of the first light beam L1 and the third light beam L3.
[0128] 9A to 9C This is only a partial embodiment. The rotating stage 910 can be configured at Figures 1 to 7 Any optical device in the optical device, for example, a rotating stage 910 is connected to the light source 110. When the rotating stage 910 rotates, all optical elements of the optical device except the rotating stage 910 can be driven to rotate together to achieve the effect of changing the light emission directions of the first light beam L1 and the third light beam L3.
[0129] In addition, the rotation angle of the rotating stage can be controlled by the user, or the rotation angle can be automatically controlled by a processor (not shown) according to timing requirements to generate linearly polarized light in a desired polarization direction.
[0130] In summary, the optical device of the present invention can recycle the light beams with different polarization directions that are filtered out by the filter, so as to improve the brightness of the system and increase the lighting efficiency.
Claims
1. An optical device, characterized in that: include: A light source for emitting a light beam; a polarization beam splitting layer, located on the optical path of the light beam, and splitting the light beam into a first light beam and a second light beam, wherein the first light beam penetrates the polarization beam splitting layer, and the second light beam is reflected by the polarization beam splitting layer, wherein the first light beam has a first polarization direction, and the second light beam has a second polarization direction perpendicular to the first polarization direction; a phase delay element, located on the optical path of the second light beam, wherein the second light beam passes through the phase delay element at least once to become a third light beam with the first polarization direction; A lens is located on the optical path of the first light beam and the optical path of the third light beam, wherein the first light beam and the third light beam respectively penetrate the lens.
2. The optical device according to claim 1, characterized in that The light source is a white light LED or a monochromatic LED.
3. The optical device according to claim 1, characterized in that The light beam is white light or monochromatic light.
4. The optical device according to claim 1, characterized in that The first polarization direction is one of the P polarization direction and the S polarization direction, and the second polarization direction is the other of the P polarization direction and the S polarization direction.
5. The optical device according to claim 1, further comprising: a first reflecting element, located on the optical path of the second light beam, a second reflecting element, located on the optical path of the third light beam, After the second light beam passes through the phase delay element, it is reflected by the first reflection element and passes through the phase delay element again, so that the second light beam becomes a third light beam with the first polarization direction. The third light beam is reflected by the second reflecting element and then penetrates the lens.
6. The optical device according to claim 5, characterized in that The phase delay element is a quarter wave plate, wherein the second light beam penetrates the quarter wave plate, is reflected by the first reflection element, and then penetrates the quarter wave plate again to become the third light beam with the first polarization direction.
7. The optical device according to claim 5, characterized in that The phase delay element is a liquid crystal film, wherein the second light beam penetrates the liquid crystal film, is reflected by the first reflection element, and then penetrates the liquid crystal film again to become the third light beam with the first polarization direction.
8. The optical device according to claim 5, characterized in that The optical device further comprises a prism, wherein the polarization splitting layer is located on a first vertical surface of the prism, the second reflecting element is located on a second vertical surface of the prism, and the lens is located on an inclined surface of the prism, After being reflected by the second reflecting element, the third light beam has the same traveling direction as the first light beam.
9. The optical device according to claim 5, characterized in that The optical device further comprises an L-shaped glass, wherein the L-shaped glass comprises a first surface and a second surface perpendicular to each other, wherein the polarization splitting layer is located on the first surface, and the second reflective element is located on the second surface. After being reflected by the second reflecting element, the third light beam has the same traveling direction as the first light beam.
10. The optical device according to claim 5, characterized in that The optical device further comprises a first prism, a second prism and a third prism. The first vertical surface of the first prism is the light incident surface of the light beam, the second vertical surface of the first prism is connected to the phase delay element, and the inclined surface of the first prism is connected to the polarization splitting layer. The first vertical surface of the second prism is connected to the lens, the second vertical surface of the second prism is connected to the first vertical surface of the third prism, and the inclined surface of the second prism is connected to the polarization splitting layer. The second vertical surface of the third prism is connected to the lens, and the inclined surface of the third prism is connected to the second reflecting element. After being reflected by the second reflecting element, the third light beam has the same traveling direction as the first light beam.
11. The optical device according to claim 10, characterized in that The first prism, the second prism and the third prism have the same shape.
12. The optical device according to claim 10, characterized in that The optical device further comprises a fourth prism, The hypotenuse of the fourth prism is connected to the second reflecting element.
13. The optical device according to claim 12, characterized in that The fourth prism has the same shape as the first prism, the second prism, and the third prism.
14. The optical device according to claim 1, characterized in that Also includes: a reflective element, located on the optical path of the second light beam; The phase delay element is located on the optical path of the second light beam. After being reflected by the reflective element, the second light beam passes through the phase delay element and becomes the third light beam with the first polarization direction.
15. The optical device according to claim 14, characterized in that The phase delay element is a half wave plate.
16. The optical device according to claim 14, characterized in that The optical device further includes a first prism, a second prism, a third prism and a fourth prism. The first vertical surface of the first prism is the light incident surface of the light beam, the second vertical surface of the first prism is connected to the first vertical surface of the third prism, and the inclined surface of the first prism is connected to the polarization splitting layer. The first vertical surface of the second prism is the light-emitting surface of the first light beam, and the inclined surface of the second prism is connected to the polarization splitting layer. The second vertical surface of the third prism is connected to the phase delay element, and the inclined surface of the third prism is connected to the reflective element. The inclined surface of the fourth prism is connected to the reflective element.
17. The optical device according to claim 16, characterized in that The first prism, the second prism, the third prism, and the fourth prism have the same shape.
18. The optical device according to claim 1, characterized in that Also includes: a reflective element, located on the optical path of the second light beam; a phase delay element, located on the optical path of the second light beam, The second light beam passes through the phase delay element, is reflected by the reflective element, and then passes through the phase delay element again to become a third light beam with the first polarization direction. The third light beam passes through the polarization beam splitting layer and the lens in sequence.
19. The optical device according to claim 18, characterized in that The phase delay element and the reflective element respectively have openings, wherein the light beam enters the polarization splitting layer through the openings.
20. The optical device according to claim 18, characterized in that The phase delay element is a quarter wave plate.
21. The optical device according to any one of claims 1 to 20, characterized in that The optical device further comprises a quarter wave plate located on the optical paths of the first light beam and the third light beam, and used for changing the polarization directions of the first light beam and the third light beam from linear polarization to circular polarization, or from linear polarization to elliptical polarization.
22. The optical device according to any one of claims 1 to 20, characterized in that The optical device further comprises a rotating stage for rotating the optical device along the light emitting directions of the first light beam and the third light beam.