CN212391676U

CN212391676U - Optical system and projection apparatus

Info

Publication number: CN212391676U
Application number: CN202021412336.6U
Authority: CN
Inventors: 刘超; 丁卫涛
Original assignee: Goertek Optical Technology Co Ltd
Current assignee: Goertek Optical Technology Co Ltd
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2021-01-22
Anticipated expiration: 2030-07-16
Also published as: WO2022011899A1

Abstract

The utility model discloses an optical system and projection equipment, optical system includes light source, first microlens array and display element in proper order along light transmission direction, the light source includes the light source panel and distributes at least one light source body on the light source panel, first microlens array includes first microlens structure, wherein, every the light source body and one first microlens structure cooperation sets up. The utility model provides an optical system and projection equipment aims at solving projection equipment and is used for optical lens in the collimating mirror group of collimation more, and the weight that leads to projection equipment is heavier, the great problem of volume.

Description

Optical system and projection apparatus

Technical Field

The utility model relates to an optical imaging technical field especially relates to an optical system and projection equipment.

Background

In traditional optical design, because the light source has the divergence angle usually when emergent ray, in order to make the light utilization ratio increase of light source, make the light that the light source sent all get into in subsequent optical element, can set up the collimating mirror group in the light-emitting side of light source usually, the light that sends the light source through the collimating mirror group is collimated, and in order to guarantee the collimation effect, the collimating mirror group can adopt the mode of a plurality of optical lens combinations usually, and to the equipment of throwing a little that requires the miniaturization, the whole volume of the optical system of equipment is thrown a little to the collimating mirror group direct influence, when optical lens quantity in the collimating mirror group is more, can lead to the weight increase of equipment of throwing a little, the volume increase, make the miniaturization of equipment of throwing a little more difficult.

The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.

SUMMERY OF THE UTILITY MODEL

The utility model provides an optical system and projection equipment aims at solving among the prior art projection equipment and is used for the optical lens of the collimating lens group of collimated light more in quantity, and the weight that leads to projection equipment is heavier, the great problem of volume.

In order to achieve the above object, the present invention provides an optical system, the optical system includes a light source, a first microlens array and a display unit in order along a light transmission direction, the light source includes a light source panel and is distributed on the light source panel at least one light source body, the first microlens array includes a first microlens structure, wherein, every the light source body and one the first microlens structure is matched to be set up.

Optionally, the light source body is one of a micro light emitting diode and a mini light emitting diode.

Optionally, the light source body at least comprises one sub light source body, and the light emitting directions of each sub light source body are the same.

Optionally, the light source body includes a first sub light source body, a second sub light source body and a third sub light source body, the first sub light source body is a red light source, the second sub light source body is a green light source, and the third sub light source body is a blue light source.

Optionally, the optical system further includes a beam splitter prism, and the beam splitter prism is disposed on the light exit side of the first microlens array.

Optionally, the optical system further includes a light uniformizing element disposed between the first microlens array and the display unit.

Optionally, the light uniformizing element includes a second microlens array, and the light incident surface and the light emergent surface of the second microlens array are respectively provided with a plurality of second microlens structures which are uniformly distributed.

Optionally, the optical system further includes a relay lens group, and the relay lens group is disposed on the light exit side of the second microlens array.

Optionally, the display unit is one of a liquid crystal display, a digital light processor, a digital micromirror device, a liquid crystal silicon chip, an organic light emitting diode, and a micro-electromechanical scanning galvanometer.

To achieve the above object, the present application provides a projection apparatus, which includes a housing and an optical system as described in any one of the above embodiments, where the optical system is accommodated in the housing.

The application provides an optical system, optical system includes light source, first microlens array and display element in proper order along light transmission direction, the light source includes the light source panel and distributes at least one light source body on the light source panel, first microlens array includes first microlens structure, wherein, every the light source body and one first microlens structure cooperation sets up. Specifically, the light that sends of light source body on the light source panel passes through rather than corresponding first microlens structure, and light is in process after first microlens structure collimates, compare with light and carry out the collimation through a plurality of optical lens in the collimating mirror group, first microlens structure can be respectively to every light that light source body sent is collimated, thereby can make the light that the light unit sent is in the outgoing process first microlens structure is collimated, thereby reduces and uses the collimating mirror group to carry out the collimation or reduces the number of optical lens in the collimating mirror group, thereby reduces the weight and the volume of little projection equipment, solves among the prior art, and projection equipment is used for the more optical lens number of the collimating mirror group of collimated light, leads to projection equipment's weight heavier, the great problem of volume.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of the optical system of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	Light source	30	Display unit
11	Light source panel	40	Light splitting prism
				12	Light source body	50	Light uniformizing element
121	Sub-light source body	51	Second microlens structure
				20	First microlens array	60	Relay lens group
21	First micro-lens structure

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.

The utility model provides an optical system and projection equipment.

Referring to fig. 1, the optical system sequentially includes a light source 10, a first microlens array 20 and a display unit 30 along a light transmission direction, the light source 10 includes a light source panel 11 and at least one light source body 12 distributed on the light source panel 11, the first microlens array 20 includes first microlens structures 21, wherein each light source body 12 is disposed in cooperation with one first microlens structure 21.

In alternative embodiments, the microlens structure may be one of a triangular microlens structure, a hexagonal microlens structure, a quadrangular microlens structure, a circular structure, and a hyperbolic microlens structure.

In an optional embodiment, the Light source body 12 of the optical system is one of a Micro Light-Emitting Diode (Micro LED) and a Mini LED (Micro LED), specifically, the Light source body 12 of the optical system is configured to provide an illumination Light for the display unit 30 to form an illumination Light path, specifically, the Light emitted from the Light source body 12 is collimated by the first microlens array 20 and then transmitted to the display unit 30, and the display unit 30 transmits the Light out of the optical system in a transmission or reflection manner.

The application provides an optical system, optical system includes light source 10, first microlens array 20 and display element 30 in proper order along light transmission direction, light source 10 includes light source panel 11 and distributes at least one light source body 12 on the light source panel 11, first microlens array 20 includes first microlens structure 21, wherein, every light source body 12 and one first microlens structure 21 cooperation sets up. Specifically, the light emitted from the light source body 12 on the light source panel 11 passes through the corresponding first microlens structure 21, and the light is collimated after passing through the first microlens structure 21, compared with the case where the light is collimated by a plurality of optical lenses in a collimator set, the first microlens structure 21 can collimate the light emitted from each of the light source bodies 12, so that the light emitted from the light source body 12 can be collimated after exiting through the first micro-lens structure 21, thereby reducing the use of the collimating lens group for collimating or reducing the number of optical lenses in the collimating lens group, thereby reduce the weight and the volume of little projection equipment, solve prior art, projection equipment is used for the collimating lens group's of collimated light optical lens more, leads to projection equipment's weight heavier, the great problem of volume.

In an alternative embodiment, the light source body 12 includes at least one sub-light source body 121, and the light emitting direction of each sub-light source body 121 is the same. In the prior art, different sub-light source bodies 121 all need corresponding collimating mirror groups, so that the size of the optical system can be reduced, different sub-light source bodies 121 are usually arranged according to different light emitting directions, and then light emitted by different sub-light source bodies 121 is transmitted or refracted through optical elements such as dichroic mirrors, so as to realize light integration, but since different sub-light source bodies 121 are arranged in different directions, and each sub-light source body 121 is provided with an individual collimating mirror group, the size of the light source 10 is large. When the plurality of sub-light source bodies 121 are arranged side by side, each sub-light source body 121 is collimated by the micro-lens structure on the micro-lens array, so that light rays emitted by the sub-light source bodies 121 do not need to be collimated by extra collimating lens groups, and because different sub-light source bodies 121 do not interfere with each other when not suitable for the collimating lens groups, different sub-light source bodies 121 are arranged side by side, compared with the inclined arrangement along different directions, and the size of the optical system can be effectively reduced.

In a preferred embodiment, the Light source body 12 includes a first sub Light source body, a second sub Light source body and a third sub Light source body, the first sub Light source body is a red Light Emitting Diode (LED) Light source 10, the second sub Light source body is a blue LED Light source 10, and the third sub Light source body is a green LED Light source 10. Specifically, the arrangement of the first sub light source body, the second sub light source body, and the third sub light source body may be adjusted according to a preset arrangement or an actual requirement of the optical system, and the arrangement of the first sub light source body, the second sub light source body, and the third sub light source body includes, but is not limited to, being arranged side by side or being arranged separately at intervals in sequence. The light emitted from each sub-light source body 121 is transmitted to the light incident surface of the corresponding micro-lens structure, and is collimated under the action of the micro-lens structure.

In an optional embodiment, the optical system further includes a splitting prism 40, the splitting prism 40 is disposed on a light exit side of the first microlens, specifically, the light emitted by the light source 10 is transmitted to the display unit 30 after being collimated by the first microlens array 20, and the display unit 30 reflects the light after receiving the light, and transmits the reflected light to a subsequent optical system of the projection apparatus after passing through the splitting prism 40. In a specific embodiment, when the display unit 30 is a reflective display unit 30, the optical system includes the beam splitter prism 40, and light can be emitted through the beam splitter prism 40, so that the transmission direction of the light can be adjusted, and the volume of the optical system can be effectively reduced; when the display unit 30 is a transmissive display unit 30, the light passing through the first microlens array 20 directly enters the display unit 30, and the display unit 30 emits light for imaging corresponding to an imaging image after receiving the light.

In an alternative embodiment, the optical system further includes a light uniformizing element 50, the light uniformizing element 50 is disposed between the first microlens array 20 and the display unit 30, specifically, after the light emitted from the light source body 12 passes through the first microlens array 20, since the light intensities of the emergent light of different sub-light source bodies 121 are not identical, and there is a case that part of the light emitted from the sub-light source bodies 121 is transmitted through the adjacent first microlens structure 21, the light emitted from the light source body 12 has uneven light intensity after passing through the first microlens array 20, and when the light with uneven light intensity is transmitted to the display unit 30, the light intensities of different areas of the emergent light from the display unit 30 are different, so as to affect the imaging quality of the optical system, in order to improve the above problem, the light homogenizing element 50 is arranged between the first micro lens array 20 and the display unit 30, and light passing through the first micro lens array 20 is homogenized through the light homogenizing element 50, so that the light intensity of light in each area is equal, the light intensity of light in different areas received by the display unit 30 can be ensured to be equal, and the problem that the brightness of different areas of an imaging picture is different is avoided.

In an optional embodiment, the light uniformizing element 50 includes a second microlens array, and a plurality of second microlens structures 51 are uniformly distributed on both the light incident surface and the light exit surface of the second microlens array. Specifically, the second microlens array is used for homogenizing the light passing through the first microlens array 20, and in a preferred embodiment, the second microlens array is a double-sided microlens structure, and the microlens structure is a circular microlens structure. It is understood that the light homogenizing element 50 can also homogenize light through other optical elements, and specifically, the light homogenizing element 50 can also include a light homogenizing sheet or a light homogenizing rod or ground glass.

In an alternative embodiment, the light unifying element 50 further includes a relay lens group 60, the relay lens group 60 is disposed on the light exit side of the second microlens array, specifically, after the light passes through the second microlens array, in order to shape the light exiting the light unifying element 50 and adjust the divergence angle of the light, the relay lens group 60 may be disposed on the light exit side of the light unifying element 50, the relay lens group 60 has positive focal power or negative focal power and is used for adjusting the divergence angle of the light, and in a preferred embodiment, the relay lens group 60 has positive focal power.

In an alternative embodiment, the Display unit 30 is one of a Liquid Crystal Display (LCD), a Digital Light Processor (DLP), a Digital micro-Mirror Device (DMD), a Liquid Crystal On Silicon (LCOS) chip, an Organic Light Emitting Diode (OLED), and a micro-electromechanical Scanning Mirror (micro-electromechanical Scanning Mirror), and it is understood that the Display unit 30 may also be a laser Light source with different wavelengths or other Light sources capable of Emitting Light beams.

In an optional embodiment, the optical system may further include a phase retarder, the phase retarder is disposed between the light splitting prism 40 and the display unit 30, specifically, the first linearly polarized light reflected by the light splitting prism 40 is transmitted through the phase retarder and then converted into circularly polarized light or elliptically polarized light, the circular polarized light or elliptically polarized light is changed in rotation after being reflected by the display unit 30, the circularly polarized light or elliptically polarized light changed in rotation is converted into second linearly polarized light after passing through the phase retarder again, the polarization direction of the second linearly polarized light is perpendicular to the polarization direction of the first linearly polarized light, and the second linearly polarized light is transmitted to the light splitting prism 40 again, then is transmitted through the light splitting prism 40, and is transmitted to a subsequent optical system of the rear projection apparatus.

The utility model discloses still provide a projection equipment, projection equipment includes such as above-mentioned arbitrary embodiment optical system, this optical system's concrete structure refers to above-mentioned embodiment, because this optical system has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer given here.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. The optical system is characterized by sequentially comprising a light source, a first micro-lens array and a display unit along a light transmission direction, wherein the light source comprises a light source panel and at least one light source body distributed on the light source panel, the first micro-lens array comprises a first micro-lens structure, and each light source body is matched with one first micro-lens structure.

2. The optical system of claim 1, wherein the light source body is one of a micro light emitting diode and a mini light emitting diode.

3. The optical system as claimed in claim 1, wherein the light source body comprises at least one sub light source body, and the light emitting direction of each sub light source body is the same.

4. The optical system according to claim 1, wherein the light source body includes a first sub light source body, a second sub light source body, and a third sub light source body, the first sub light source body is a red light source, the second sub light source body is a green light source, and the third sub light source body is a blue light source.

5. The optical system of claim 1, further comprising a beam splitting prism disposed on a light exit side of the first microlens array.

6. The optical system of claim 1, further comprising a light unifying element disposed between the first microlens array and the display unit.

7. The optical system as claimed in claim 6, wherein the light uniformizing element comprises a second micro lens array, and a plurality of second micro lens structures are uniformly distributed on both the light incident surface and the light emergent surface of the second micro lens array.

8. The optical system of claim 7, further comprising a relay lens set disposed on the light exit side of the second microlens array.

9. The optical system of claim 1, wherein the display unit is one of a liquid crystal display, a digital light processor, a digital micromirror device, a liquid crystal silicon chip, an organic light emitting diode, and a micro-electromechanical scanning galvanometer.

10. A projection device comprising a housing and an optical system according to any one of claims 1-9, the optical system being housed in the housing.