Optical module and projection equipment applying same
Patent Information
- Application Number
- CN202280102831.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2022-12-30
- Publication Date
- 2025-08-12
AI Technical Summary
In existing optical equipment, the optical system is complex in design, large in size, and high in cost, making it difficult to achieve efficient polychromatic light synthesis, and the design of the light source leads to energy loss and increased cost.
Using mirror-symmetrical first and second optical components, the collimation and convergence of light is achieved through collimated light sources and combined light structures, reducing the complexity of the optical path, and reducing the difficulty of manufacturing circuit substrates and energy loss through the mixing of multiple light sources. .
The optical system structure is simplified, the light utilization rate and the luminous area are improved, the cost is reduced, and the uniform mixing effect and luminous brightness of the light source are improved.
Smart Images
Figure CN120476345A_ABST
Abstract
Description
Optical module and projection equipment using the same Technical Field
[0001] The present invention relates to the field of optical technology, and in particular to an optical module and a projection device using the same. Background Art
[0002] With the development of technology, people have put forward higher requirements for the portability of consumer electronic products. Small size and light weight have become important development directions of the electronics market. Based on this, higher design requirements are currently put forward for the design of optical systems in optical devices such as projectors, AR (augmented reality), and VR (virtual reality).
[0003] In optical devices such as projectors, AR, and VR, it's often necessary to combine multiple colors of light to meet functional requirements. Currently, this is accomplished using various methods, including combined filters, x-cubes, and x-plates. However, these methods have drawbacks such as large size, difficult processing, and high assembly complexity.
[0004] Traditional light combination uses the x-cube method to synthesize RGB colors into white light.
[0005] As shown in Figure 1, the existing three-color X-shaped combining prism (also known as an X-cube) utilizes a square X-shaped prism with orthogonal, coated, and glued surfaces in the center. It commonly combines red, green, and blue light (RGB) into white light. The filter on one side reflects blue light and transmits red and green light, while the other side reflects red light and transmits blue and green light. When the RGB light enters the X-cube from its respective incident surfaces, white light is emitted from the surface, as shown in the figure. The incident light must be directed at a 45° angle toward the corresponding filter, and the relative aperture of the particles used is relatively small. Current X-cube light combining requires a certain optical path length and several optical components from the light source to the incident surface to achieve the desired function. When combining light between two adjacent X-cubes, one of the surfaces is always limited by the optical path length, which is a limiting factor in the application of X-cubes.
[0006] Based on the defects of the current three-color prism, some people have proposed the idea of using a double prism for merging, such as the patent number 202111277059.1. This technology, when integrating, requires a light source that has been converged and narrowed, that is, it is an abstract light source; to generate such a light source, a sufficient optical path and a certain number of optical devices, as well as the light source itself, are required. In other words, in order to implement this optical path, in addition to the prism assembly, a light source system with optical devices and optical paths is also required. In addition, the light from the light source is projected onto the inclined surface, and the filter film transmits the light to the incident surface; the filter film on the surface of the incident surface reflects the light from the light source and projects the light back onto the inclined surface. The filter film on the inclined surface reflects the light and emits it from the exit surface. In other words, this patent requires a complex filter film design; the process difficulty increases, and the cost will be relatively high; the reflection of multiple surfaces also leads to a large amount of energy loss.
[0007] Secondly, due to the long optical path of the surface light source, the relative aperture of the surface light source must be higher, or the other two light sources need to use phase retarders to achieve equal optical path or consistent phase. The increase in components leads to increased costs.
[0008] In addition, it can be seen from the above existing technologies that the commonly used light source distribution schemes for LED projectors are reflector cup distribution and lens distribution, but these methods are based on the collection efficiency and light distribution issues under a single light source and one illuminated area. Generally speaking, there are still problems in terms of light source power and multiple lighting areas, or there are high costs and difficult designs. Technical issues
[0009] The present invention provides an optical module and a projection device using the same, which can overcome the technical problem of complex structure in the prior art. Technical Solutions
[0010] To achieve the above object, the present invention adopts the following technical solutions:
[0011] An optical module includes: a first optical component and a second optical component, the structure of the first optical component is consistent with the structure of the second optical component, the first optical component and the second optical component are abutted and arranged in mirror symmetry, the first optical component includes: a first collimated light source, a second collimated light source and a first light-combining structure, the optical axes of the first collimated light source and the second collimated light source are perpendicular to each other, the first light-combining structure is arranged on the light-emitting surfaces of the first collimated light source and the second collimated light source, and the first angles between the first light-combining structure and the optical axes of the first collimated light source and the second collimated light source are both first preset angles, and the emergent light rays of the first optical component and the second optical component are parallel and in the same direction.
[0012] In an optional embodiment, the second optical component includes: a third collimated light source, a fourth collimated light source and a second light-combining structure, the optical axes of the third collimated light source and the fourth collimated light source are perpendicular to each other, the second light-combining structure is arranged on the light-emitting surfaces of the third collimated light source and the fourth collimated light source, and the angles between the second light-combining structure and the optical axes of the third collimated light source and the fourth collimated light source are both the first preset angles, one end of the first light-combining structure is connected to one end of the second light-combining structure and are perpendicular to each other, the second collimated light source and the third collimated light source are located in the same horizontal plane, and the light-emitting surfaces of the first collimated light source and the fourth collimated light source are opposite.
[0013] In an optional embodiment, the first collimated light source includes: a first light source and a first collimating element arranged on the light-emitting surface of the first light source, the second collimated light source includes: a second light source and a second collimating element arranged on the light-emitting surface of the second light source, the third collimated light source includes: a third light source and a third collimating element arranged on the light-emitting surface of the third light source, and the fourth collimated light source includes: a fourth light source and a fourth collimating element arranged on the light-emitting surface of the fourth light source.
[0014] In an optional embodiment, the first optical component also includes: a first reflector for reflecting the light of the fourth light source, the second optical component also includes a second reflector for reflecting the light of the first light source, the first reflector and the second reflector are mirror-symmetrical, the first reflector is arranged on the side of the first light source away from the second light source, the second reflector is arranged on the side of the fourth light source away from the third light source, the angle between the first reflector and the optical axis of the first light source and the angle between the second reflector and the optical axis of the fourth light source are both second preset angles, and the second preset angle is 0°~16°.
[0015] In an optional manner, the first preset angle is 43°~46°, and / or the second preset angle is 0°~15°.
[0016] In an optional embodiment, the first light-combining structure includes an isosceles right-angle prism, the second light-combining structure includes a second isosceles right-angle prism, the first isosceles right-angle prism includes two first sub-isosceles right-angle prisms with two right-angled sides stacked together, the second isosceles right-angle prism includes two second sub-isosceles right-angle prisms with two right-angled sides stacked together, and the hypotenuses of the first isosceles right-angle prism and the second isosceles right-angle prism are stacked together.
[0017] In an optional manner, the first light-combining structure and the second light-combining structure are both right-angle prisms, and the first light-combining structure and the second light-combining structure form a rectangular structure.
[0018] In an optional manner, the first light-combining structure and the second light-combining structure are both dichroic lenses to reflect blue light and transmit green light and red light.
[0019] In an optional manner, the second light source and the third light source are red and green mixed light sources, and the first light source and the fourth light source are blue light sources; or,
[0020] The first light source, the second light source, the third light source and the fourth light source are all blue light sources. A first optical conversion film is respectively arranged between the second light source and the second collimating element and between the third light source and the third collimating element to convert blue light into red and green mixed light.
[0021] In an optional manner, the first light-combining structure and the second light-combining structure are both dichroic lenses to reflect green light and transmit blue light and red light.
[0022] In an optional manner, the second light source and the third light source are red and blue mixed light sources, and the first light source and the fourth light source are green light sources; or
[0023] The first light source, the second light source, the third light source and the fourth light source are all blue light sources. A second optical conversion film is respectively provided between the second light source and the second collimating element, and between the third light source and the third collimating element to convert blue light into red and blue mixed light. A third conversion film is provided between the first light source and the first collimating element, and between the fourth light source and the fourth collimating element to convert blue light into green light.
[0024] In an optional manner, the first light-combining structure and the second light-combining structure are both dichroic lenses to reflect red light and transmit blue light and green light.
[0025] In an optional manner, the first light-combining structure and the second light-combining structure are both dichroic lenses to reflect red light and transmit blue light and green light.
[0026] In an optional manner, the first collimating element, the second collimating element, the third collimating element and the fourth collimating element are one of a first lens group or a first microlens array.
[0027] In an optional embodiment, the optical module also includes a fixed bracket, which is a square frame. The first light source is fixed to an inner wall of the square frame, the second light source and the third light source are fixed to the upper side wall of the square frame, and the fourth light source is fixed to the other inner wall of the square frame opposite to the inner wall.
[0028] In an optional manner, bosses are respectively provided at both ends of the upper side wall of the square frame, which are used to fix one end of the first light-combining structure and the second light-combining structure respectively, and the other ends of the first light-combining structure and the second light-combining structure are fixedly connected by a connecting member.
[0029] In an optional manner, the optical structure further includes a second lens group or a second microlens array arranged on a side of the connecting member away from the boss.
[0030] In an optional manner, a polarization separation component is further provided between the lenses of the second lens group; and / or a stop is further provided on the side of the second lens group away from the second light source.
[0031] In an optional manner, a heat sink is respectively provided between the first light source and the side wall, between the second light source and the third light source and the upper side wall, and between the fourth light source and the other side wall.
[0032] An embodiment of the present invention further provides a projection device, which includes: a liquid crystal screen and the above-mentioned optical module. Beneficial effects
[0033] Compared with the prior art, the present invention has the following beneficial effects: a first optical component and a second optical component are arranged in a mirror-like manner to achieve collimation and convergence of light. The light from the first optical component and the second optical component are aggregated together, the structure is simple, and the luminous area can be increased, thereby improving the utilization rate of light. BRIEF DESCRIPTION OF THE DRAWINGS
[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. The drawings described below are only drawings corresponding to some embodiments of the present invention.
[0035] Figure 1 is a diagram of an existing light combining method;
[0036] FIG2 is a structural block diagram of an optical module provided by one embodiment of the present invention;
[0037] FIG3 shows a schematic diagram of a partial structure of an optical module provided by an embodiment of the present invention;
[0038] FIG4 shows a schematic diagram of a partial structure of an optical module provided by one embodiment of the present invention;
[0039] FIG5 is a schematic diagram showing a partial structure of an optical module provided by one embodiment of the present invention;
[0040] FIG6 is a schematic diagram showing a light combining structure of an optical module provided by an embodiment of the present invention. Best Mode for Carrying Out the Invention
[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.
[0042] Directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", "top" and "bottom", are only used with reference to the directions of the drawings. The directional terms used are used to illustrate and understand the present invention, and are not used to limit the present invention.
[0043] The terms "first" and "second" in the present invention are used for descriptive purposes only and should not be understood as indicating or implying relative importance, and should not be used as a limitation on the order of precedence.
[0044] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.
[0045] Example 1:
[0046] Please refer to Figure 1. A preferred embodiment of the present invention provides a structural schematic diagram of an optical module, which includes: a first optical component 1 and a second optical component 2, wherein the specific structures of the first optical component 1 and the second optical component 2 are consistent, and the first optical component 1 and the second optical component 2 are arranged in mirror symmetry, and the outgoing light rays of the first optical component 1 and the second optical component 2 are parallel and in the same direction.
[0047] In an embodiment of the present invention, a first optical component and a second optical component are provided in a mirror-like arrangement to achieve collimation and convergence of light. The light from the first optical component and the light from the second optical component are aggregated together, which has a simple structure and can increase the light-emitting area and improve the utilization rate of light.
[0048] Example 2:
[0049] In a preferred embodiment of the present invention, as shown in Figure 2, the first optical component 1 includes: a first collimated light source 11, a second collimated light source 12 and a first light-combining structure 13. The optical axes of the first collimated light source 11 and the second collimated light source 12 are perpendicular to each other. As shown in Figure 2, the first light-combining structure 13 is arranged on the light-emitting surfaces of the first collimated light source 11 and the second collimated light source 12, and the angles between the first light-combining structure 13 and the optical axes of the first collimated light source 11 and the second collimated light source 12 are both first preset angles.
[0050] See Figure 2, the second optical component 2 includes: a third collimated light source 21, a fourth collimated light source 22 and a second light-combining structure 23, wherein the optical axes of the third collimated light source 21 and the fourth collimated light source 22 are perpendicular to each other, the second light-combining structure 23 is arranged on the light-emitting surfaces of the third collimated light source 21 and the fourth collimated light source 22, and the angles between the second light-combining structure 23 and the optical axes of the third collimated light source 21 and the fourth collimated light source 22 are both the first preset angles, further, one end of the first light-combining structure 13 is connected to one end of the second light-combining structure 23 and are perpendicular to each other, further, the second collimated light source 12 and the third collimated light source 22 are located in the same horizontal plane, and the light-emitting surfaces of the first collimated light source 11 and the fourth collimated light source 21 are arranged opposite to each other, as shown in Figure 2. In this embodiment, the first preset angle can be 43°~46°, and more preferably, the first preset angle is 45°. In this embodiment, the angle between the first light-combining structure 13, the second light-combining structure 23 and the optical axis of the light source is set to 45°, which can avoid the transmission and reflection of the light-combining structure from shifting toward short-wavelength light to a certain extent, thereby avoiding color deviation.
[0051] It should be noted that the first collimated light source 11 , the second collimated light source 12 , the third collimated light source 21 and the fourth collimated light source 22 can be ordinary light sources that are collimated and converged by collimating optical elements.
[0052] In a preferred embodiment of the present invention, the first collimated light source 11 includes a first light source 111 and a first collimating element 112 disposed on the light-emitting surface of the first light source 111. The second collimated light source 12 includes a second light source 121 and a second collimating element 122 disposed on the light-emitting surface of the second light source 121. The third collimated light source 21 includes a third light source 211 and a third collimating element 212 disposed on the light-emitting surface of the third light source 211. The fourth collimated light source 22 includes a fourth light source 221 and a fourth collimating element 222 disposed on the light-emitting surface of the fourth light source 221. The first light source 111, the second light source 121, the third light source 211, and the fourth light source 221 are array-distributed LED chips. The size of the LED chips can be 2*2, 3*3, or 4*4 (in mm), which is not limited here. Preferably, the size is 4*4. The LED chip is a single-sided light source. In this optical module, the second light source 121 and the third light source 211 can form a larger surface light source. In this embodiment, the first collimating element 112, the second collimating element 122, the third collimating element 211, and the fourth collimating element 222 are preferably aspherical free-form mirrors, which are used to converge the light, that is, the light can be shaped into a square or rectangle, forming a nearly rectangular light spot on the light-emitting surface. The size of the light spot satisfies b>0.85a, where a represents the long side size of the rectangular light spot and b represents the short side size of the rectangular light spot. The fixing method of the LED chip can adopt an existing fixing method, which is not limited here.
[0053] As shown in Figures 3 to 5, in a preferred embodiment of the present invention, the optical module further includes: a fixed bracket 3, the fixed bracket 3 is a square frame (rectangular or square frame), the first light source 111 is arranged on a side wall of the fixed bracket 3 (such as the left wall), the second light source 121 and the third light source 211 are both arranged on the upper side wall of the fixed bracket 3, and the fourth light source 221 is arranged on the other inner side wall of the fixed bracket 3 opposite to the left side wall (such as the right wall).
[0054] In a preferred embodiment of the present invention, the first optical component 1 further includes: a first reflector 14 for reflecting the fourth light source 22, and the second optical component 2 further includes: a second reflector 24 for reflecting the light of the first light source 11, the first reflector 14 and the second reflector 24 are arranged in mirror symmetry, the first reflector 14 is arranged on the side of the first light source 111 away from the second light source 121, and the angle between the first reflector 14 and the optical axis of the first light source 111 is a second preset angle, and the second reflector 24 is arranged on the side of the fourth light source 221 away from the third light source 211, and the second preset angle is 0°~16°. Further, the second preset angle can be 0~15°. In this embodiment, preferably, the second preset angle is 15°.
[0055] In this embodiment, a divergence angle a of light exiting the lens is defined, and the optimal angle of the divergence angle is 15 degrees.
[0056] The angle between the reflector and the LCD screen (or the optical axis of the first light source 111) is defined as β. The reflector will reflect large-angle light (e.g., light with a divergence angle of a) onto the LCD screen. The angle β can be calculated using the following formula:
[0057] (52.5°+a / 2)>β>a+30°. Since 0°≤a≤16°, 30°<β<60.5°. It should be noted that the reflector can select an existing reflector structure, and there is no restriction on this here. The second preset angle is 15°, which can effectively solve the problem of light interference.
[0058] In this embodiment, during subsequent applications of the optical module, the collimated light will still have a certain divergence angle α, which is controlled to be approximately 0° to 16°. In this embodiment, experiments have shown that if the angle between the light and the dichroic lens increases from 10 degrees to 70 degrees, the impact on the wavelength of the light will exceed 100nm, which can easily lead to a large change in color. On the other hand, an excessively large angle is not easy to collect to illuminate the LCD screen. The divergence angle α is controlled to be no greater than 16°, so that when the light passes through the light-combining structure, the wavelength of the light does not drift by more than 30nm. Even if the color changes, it is not easy for the eyes to capture it intuitively, thereby avoiding visual deviation caused by the color change.
[0059] In a preferred embodiment of the present invention, bosses (15 and 25) are respectively provided at both ends of the upper side wall of the square frame, see Figures 3, 4 and 5, the boss 15 is used to fix the first light-combining structure 13, and the boss 25 is used to fix the second light-combining structure 23. The second light source 12 and the third light source 21 are fixed to the upper side wall of the square frame, see Figure 2, the first light source 111 is arranged on the left side wall of the fixed square frame, and the fourth light source 211 is fixed to the right side wall of the square frame. One end of the first light-combining structure 13 is fixed to the boss 15, and the other end is connected to one end of the second light-combining structure 23. The other end of the second light-combining structure 23 is fixed to the boss 25. The first light-combining structure 13 and the second light-combining structure 23 are fixedly connected by a connecting member 4. The connecting member can be a snap-fit member, or other structure that can realize the fixed connection function, which is not limited here. The first light-combining structure 13 and the second light-combining structure 23 are perpendicular to each other, the angle between the first light-combining structure 13 and the upper side wall is 45°, and the angle between the second light-combining structure 23 and the upper side wall is also 45°.
[0060] In a preferred embodiment of the present invention, the optical structure further includes a second lens group 5 or a second microlens array disposed on the side of the connector 4 away from the boss 15 (i.e., the upper sidewall). In a preferred solution of this embodiment, the lenses in this lens group are aspherical lenses with a diameter of 19 mm and a height of 18 mm. In this embodiment, the spacing between the first lens group and the second lens group can be 20 to 50 mm.
[0061] In a preferred embodiment of the present invention, the second lens group 5 includes a plurality of aspheric lenses arranged in parallel, and a polarization separation component is provided between the plurality of aspheric lenses for performing polarization conversion.
[0062] In a preferred embodiment of the present invention, as shown in Figure 4 , a stop 6 is further provided on the side of the second lens group 5 facing away from the second light source 121 (i.e., the upper sidewall) to intercept light with a large divergence angle. For example, this can intercept light with a divergence angle greater than 16°. This ensures that, after reflection, the angle between the light and the vertically downward optical axis is equal to the divergence angle, thereby preventing the formation of stray light. In this embodiment, the stop 6 can intercept light with a large angle, thereby preventing the formation of stray light.
[0063] In a preferred embodiment of the present invention, a heat sink 7 is respectively provided between the first light source 111 and the left side wall, between the second light source 121 and the third light source 211 and the upper side wall, and between the fourth light source 221 and the right side wall. In this embodiment, the light source is directly provided on the heat sink 7, and the heat is transferred out through the heat sink, which can solve the heat dissipation problem, protect the light source to a certain extent, and improve the service life of the light source.
[0064] In a preferred embodiment of the present invention, the first light-combining structure 13 and the second light-combining structure 23 are both right-angle prisms. The two right-angle prisms form a rectangular structure. In the present embodiment, the two right-angle prisms are both isosceles right-angle prisms.
[0065] In another preferred embodiment of the present invention, the first light-combining structure 13 is a first isosceles right-angle prism, and the second light-combining structure 23 is a second isosceles right-angle prism. The first isosceles right-angle prism includes two first sub-isosceles right-angle prisms with two right-angled sides stacked together, and the second isosceles right-angle prism includes two second sub-isosceles right-angle prisms with two right-angled sides stacked together. The hypotenuse of the first isosceles right-angle prism and the hypotenuse of the second isosceles right-angle prism are stacked together. That is, the first light-combining structure 13 and the second light-combining structure 23 are combined to form an X-CUBE light-combining prism. As shown in FIG6 .
[0066] Preferably, the first light-combining structure 13 and the second light-combining structure 23 are both dichroic lenses, which can reflect blue light and transmit red light and green light.
[0067] In a preferred embodiment of the present invention, the first light source 111, the second light source 121, the third light source 211 and the fourth light source 212 are all blue light sources, and a first optical conversion film (not shown in the figure) is respectively provided between the second light source 121 and the second collimating element 122, and between the third light source 211 and the third collimating element 212 to convert blue light into red and green mixed light. In which, the first optical conversion film can be a quantum dot conversion film with added red and green quantum dot materials, or an optical conversion film with added red and green phosphor materials, which is not limited here. In which, the blue light emitted by the first light source 111 is collimated by the first collimating element 112 and then reflected through the first photosynthetic structure 113. The blue light emitted by the second light source 121 and the third light source 211 is collimated and converged by their respective collimating elements and then transmitted through the first photosynthetic structure 13 and the second photosynthetic structure 23 respectively. The blue light emitted by the fourth light source 221 is collimated and converged by the fourth collimating element 222 and then reflected through the second light-combining structure. The light from the first light source 111, the second light source 121, the third light source 211 and the fourth light source 221 is finally converged together, and the red light, blue light and green light are combined to emit white light.
[0068] In a variation of this embodiment, the second light source 121 and the third light source 211 are red and green mixed light sources, and the first light source 111 and the fourth light source 221 are blue light sources.
[0069] In another preferred embodiment of the present invention, the first light-combining structure 13 and the second light-combining structure 23 are both dichroic lenses that can reflect green light and transmit blue light and red light. The second light source 121 and the third light source 211 are red-blue mixed light sources, and the first light source 111 and the fourth light source 221 are green light sources.
[0070] In a variation of this embodiment, the first light source 111, the second light source 121, the third light source 211, and the fourth light source 221 are all blue light sources. A second optical conversion film (not shown in the figure) is respectively provided between the second light source 121 and the second collimating element 122, and between the third light source 211 and the third collimating element 212 to convert blue light into red and blue mixed light. A third optical conversion film (not shown in the figure) is provided between the first light source 111 and the first collimating element 112, and between the fourth light source 221 and the fourth collimating element 222. ), to convert blue light into green light, wherein the second optical conversion film may be a quantum dot film doped with red quantum dots, or a phosphor layer doped with red phosphor. The doping ratio of the red quantum dots or red phosphor can be determined according to the actual light ratio. Generally, the doping ratio is relatively low, so that a portion of the blue light that does not encounter the red quantum dots or red phosphor is directly emitted, and when it encounters the red quantum dots or red phosphor, it is converted into red light, thereby obtaining a red and blue mixed light. The third optical conversion film may be a green light conversion film, to convert the incident blue light into green light.
[0071] In another preferred embodiment of the present invention, both the first light-combining structure 13 and the second light-combining structure 23 are dichroic lenses to reflect red light and transmit blue light and green light.
[0072] Furthermore, the first light source 111 and the fourth light source 221 are red light sources, and the second light source 121 and the third light source 211 are blue-green mixed color light sources.
[0073] In a variation of this embodiment, the first light source 111, the second light source 121, the third light source 211, and the fourth light source 221 are all blue light sources. A fourth optical conversion film (not shown in the figure) is respectively provided between the first light source 111 and the first collimating element 112, and between the fourth light source 221 and the fourth collimating element 222 to convert blue light into red light. A fifth optical conversion film (not shown in the figure) is provided between the second light source 121 and the second collimating element 122, and between the third light source 211 and the third collimating element 212 to convert blue light into red light. Blue light is converted into blue-green mixed light, wherein the fourth optical conversion film can be a red light conversion film, which can directly convert blue light into red light, and the fifth optical conversion film can be a quantum dot film doped with green quantum dot material, or a phosphor layer doped with green phosphor material, wherein the incorporation ratio of the green quantum dots or green phosphor can be determined according to the actual light ratio. Generally speaking, the incorporation ratio will be relatively low, so that a part of the blue light that does not hit the green quantum dots or green phosphor is directly emitted, and when it hits the green quantum dots or green phosphor, it will be converted into green light, thereby obtaining a blue-green mixed light.
[0074] Specifically, the blue light emitted by the first light source 111 passes through the fourth optical conversion film to obtain red light, and the red light is incident on the first collimating element 112 for light collimation and convergence, and then is incident on the first light combining structure 13 for red light reflection, and finally emitted vertically to the horizontal plane; the blue light emitted by the second light source 121 and the third light source 211 passes through the fifth optical conversion film, and the blue light is converted into blue-green light, and then passes through the second collimating element 122 and the third collimating element 212 respectively for light convergence and collimation, and is respectively emitted to the corresponding first The light-combining structure 13 and the second light-combining structure 23 project light, which is then emitted perpendicular to the horizontal plane. The blue light emitted by the fourth light source 221 passes through the fourth optical conversion film to produce red light, which is then incident on the fourth light-combining structure 23 for red light reflection, and finally emitted perpendicular to the horizontal plane. The light emitted by the first light source 111, the second light source 121, the third light source 211, and the fourth light source 221 is then converted, collimated, transmitted, or reflected, and then emitted perpendicular to the optical axis of the first light source 111, achieving a mixture of blue-green light and red light, ultimately emitting white light. In this embodiment, the mixing ratio of the blue light, red light, and green light can preferably be 1:3:8. This mixing ratio has a higher color temperature and a relatively balanced white balance.
[0075] It should be noted that a corresponding optical conversion film can also be set on the side of the corresponding collimating element away from the corresponding light source. For example, an optical conversion film can be set on the side of the first collimating element 112 away from the first light source 111 to achieve light conversion. This is not limited here.
[0076] In an embodiment of the present invention, a first optical component and a second optical component are provided in a mirror-image arrangement to achieve light collimation and convergence. The light from the first optical component and the second optical component is aggregated together to increase the light-emitting area and improve the utilization rate of light.
[0077] Secondly, setting up mutually perpendicular light-combining structures to reflect or transmit light can effectively achieve the mixing of RGB light. By mixing multiple light sources, the difficulty of making circuit substrates for RGB light sources can be reduced, and the effect of uniform mixing of light sources is improved without producing color spots. Since the three colors of RGB light sources have different sensitivities to temperature, driving them by color can consider the heat dissipation of light sources of specific colors separately, thereby maintaining better lighting efficiency.
[0078] Furthermore, by arranging reflectors below the first light source and the fourth light source, the central light can be increased, the edge light can be reduced, interference can be avoided, and the luminous brightness and uniformity can be improved.
[0079] Furthermore, using multiple light sources to collimate illumination for a liquid crystal screen reduces the demand for the optical etendue of a single light source and improves the utilization rate of the light source.
[0080] Based on the above embodiments, the present invention also proposes a projection device, which includes a liquid crystal screen and an optical module. The optical module is applied to the projection device, and the liquid crystal screen is arranged on the light-emitting surface of the optical module. The specific structure, working principle and technical effects brought about by the optical module are consistent with the description of the above embodiments and will not be repeated here.
[0081] In this embodiment, when using RGB light sources, the wavelength of the R light source is 620 nm, the wavelength of the G light source is 560 nm, and the wavelength of the B light source is 455 nm. The distance between the RB light source and the display screen is 45 mm, and the distance between the G light source and the display screen is 55 mm. The LCD screen can be an existing LCD screen, and this is not limited here.
[0082] In an embodiment of the present invention, a first optical component and a second optical component are provided in a mirror-image arrangement to achieve light collimation and convergence. The light from the first optical component and the second optical component is aggregated together to increase the light-emitting area and improve the utilization rate of light.
[0083] Secondly, setting up mutually perpendicular light-combining structures to reflect or transmit light can effectively achieve the mixing of RGB light. By mixing multiple light sources, the difficulty of making circuit substrates for RGB light sources can be reduced, and the effect of uniform mixing of light sources is improved without producing color spots. Since the three colors of RGB light sources have different sensitivities to temperature, driving them by color can consider the heat dissipation of light sources of specific colors separately, thereby maintaining better lighting efficiency.
[0084] Furthermore, by arranging reflectors below the first light source and the fourth light source, the central light can be increased, the edge light can be reduced, interference can be avoided, and the luminous brightness and uniformity can be improved.
[0085] Furthermore, using multiple light sources to collimate illumination for a liquid crystal screen reduces the demand for the optical etendue of a single light source and improves the utilization rate of the light source.
[0086] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.
Claims
1. An optical module, characterized in that: include: A first optical component and a second optical component, the structure of the first optical component is consistent with the structure of the second optical component, the first optical component and the second optical component are abutted and arranged in mirror symmetry, the first optical component includes: a first collimated light source, a second collimated light source and a first light-combining structure, the optical axes of the first collimated light source and the second collimated light source are perpendicular to each other, the first light-combining structure is arranged on the light-emitting surface of the first collimated light source and the second collimated light source, and the angles between the first light-combining structure and the optical axis of the first collimated light source and the optical axis of the second collimated light source are both first preset angles, and the emergent light rays of the first optical component and the second optical component are parallel and in the same direction.
2. The optical module according to claim 1, wherein: The second optical component includes: a third collimated light source, a fourth collimated light source and a second light-combining structure, the optical axes of the third collimated light source and the fourth collimated light source are perpendicular to each other, the second light-combining structure is arranged on the light-emitting surfaces of the third collimated light source and the fourth collimated light source, and the angles between the second light-combining structure and the optical axes of the third collimated light source and the fourth collimated light source are both the first preset angles, one end of the first light-combining structure is connected to one end of the second light-combining structure and are perpendicular to each other, the second collimated light source and the third collimated light source are located in the same horizontal plane, and the light-emitting surfaces of the first collimated light source and the fourth collimated light source are opposite.
3. The optical module according to claim 1 or 2, wherein: The first collimated light source includes: a first light source and a first collimating element arranged on the light exit surface of the first light source; the second collimated light source includes: a second light source and a second collimating element arranged on the light exit surface of the second light source; the third collimated light source includes: a third light source and a third collimating element arranged on the light exit surface of the third light source; and the fourth collimated light source includes: a fourth light source and a fourth collimating element arranged on the light exit surface of the fourth light source.
4. The optical module according to claim 3, wherein: The first optical component also includes: a first reflector for reflecting the light of the fourth light source, and the second optical component also includes a second reflector for reflecting the light of the first light source, the first reflector and the second reflector are mirror-symmetrical, the first reflector is arranged on the side of the first light source away from the second light source, and the second reflector is arranged on the side of the fourth light source away from the third light source, the angle between the first reflector and the optical axis of the first light source and the angle between the second reflector and the optical axis of the fourth light source are both second preset angles, and the second preset angle is 0~16.
5. The optical module according to claim 4, wherein: The first preset angle is 43-46°, and / or the second preset angle is 0-15°.
6. The optical module according to any one of claims 2 to 5, characterized in that: The first light-combining structure includes an isosceles right-angle prism, the second light-combining structure includes a second isosceles right-angle prism, the first isosceles right-angle prism includes two first sub-isosceles right-angle prisms with two right-angled sides stacked together, the second isosceles right-angle prism includes two second sub-isosceles right-angle prisms with two right-angled sides stacked together, and the hypotenuses of the first isosceles right-angle prism and the second isosceles right-angle prism are stacked together.
7. The optical module according to any one of claims 2 to 5, characterized in that: The first light-combining structure and the second light-combining structure are both right-angle prisms, and the first light-combining structure and the second light-combining structure form a rectangular structure.
8. The optical module according to any one of claims 2 to 5, wherein: The first light-combining structure and the second light-combining structure are both dichroic lenses to reflect blue light and transmit green light and red light.
9. The optical module according to claim 8, wherein: The second light source and the third light source are red and green mixed light sources, and the first light source and the fourth light source are blue light sources; or, The first light source, the second light source, the third light source and the fourth light source are all blue light sources. A first optical conversion film is respectively arranged between the second light source and the second collimating element and between the third light source and the third collimating element to convert blue light into red and green mixed light.
10. The optical module according to any one of claims 2 to 5, characterized in that: The first light-combining structure and the second light-combining structure are both dichroic lenses to reflect green light and transmit blue light and red light.
11. The optical module according to claim 10, wherein: The second light source and the third light source are red and blue mixed light sources, and the first light source and the fourth light source are green light sources; or The first light source, the second light source, the third light source and the fourth light source are all blue light sources. A second optical conversion film is respectively provided between the second light source and the second collimating element, and between the third light source and the third collimating element to convert blue light into red and blue mixed light. A third conversion film is provided between the first light source and the first collimating element, and between the fourth light source and the fourth collimating element to convert blue light into green light.
12. The optical module according to any one of claims 2 to 5, characterized in that: The first light-combining structure and the second light-combining structure are both dichroic lenses to reflect red light and transmit blue light and green light.
13. The optical module according to claim 12, wherein: The first light source and the fourth light source are red light sources, and the second light source and the third light source are blue-green mixed color light sources; or The first light source, the second light source, the third light source and the fourth light source are all blue light sources. A fourth optical conversion film is respectively provided between the first light source and the first collimating element, and between the fourth light source and the fourth collimating element to convert blue light into red light. A fifth optical conversion film is provided between the second light source and the second collimating element, and between the third light source and the third collimating element to convert blue light into blue-green mixed light.
14. The optical module according to claim 2, wherein: The first collimating element, the second collimating element, the third collimating element and the fourth collimating element are one of a first lens group or a first micro lens array.
15. The optical module according to claim 3, wherein: The optical module also includes a fixed bracket, which is a square frame. The first light source is fixed to an inner wall of the square frame, the second light source and the third light source are fixed to the upper side wall of the square frame, and the fourth light source is fixed to the other inner wall of the square frame opposite to the inner wall.
16. The optical module according to claim 15, wherein: Bosses are respectively provided at both ends of the upper side wall of the square frame, which are respectively used to fix one end of the first light-combining structure and the second light-combining structure. The other ends of the first light-combining structure and the second light-combining structure are fixedly connected by a connecting member.
17. The optical module according to claim 15, wherein: The optical structure further includes a second lens group or a second microlens array arranged on a side of the connecting member away from the boss.
18. The optical module according to claim 17, wherein: A polarization separation component is further provided between the lenses of the second lens group; and / or a stop is further provided on a side of the second lens group away from the second light source.
19. The optical module according to claim 15, wherein: Heat sinks are respectively provided between the first light source and the side wall, between the second light source and the third light source and the upper side wall, and between the fourth light source and the other side wall.
20. A projection device, characterized in that: The optical module comprises a liquid crystal screen and the optical module according to any one of claims 1 to 19, wherein the liquid crystal screen is arranged on the light-emitting surface of the optical module.