CN110418044B

CN110418044B - Optical system and electronic apparatus

Info

Publication number: CN110418044B
Application number: CN201910698861.4A
Authority: CN
Inventors: 杨鑫
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2021-04-23
Anticipated expiration: 2039-07-31
Also published as: CN110418044A

Abstract

An optical system and an electronic device are disclosed. The optical system comprises a display screen, a micro-lens array arranged below the display screen, a lens module and an image sensor in sequence from an object side to an image side. The display screen comprises a plurality of pixel units which are periodically arranged, each pixel unit forms a diffraction unit, and incident light generates diffraction effect through the display screen to form diffraction light. The microlens array includes a plurality of microlenses in a periodic arrangement that collimate diffracted light. The lens module is used for converging light rays collimated by the micro lenses on the image sensor, and the image sensor is used for converting the converged light rays into electric signals for imaging. The micro lens array formed by the micro lenses arranged periodically is arranged between the display screen and the lens module, and the diffraction light rays generated after passing through the display screen are all converged on the image sensor by the micro lens array and the lens module, so that the phenomenon that the diffraction light rays are similar to starburst during imaging is avoided, and the imaging quality is improved.

Description

Optical system and electronic apparatus

Technical Field

The present application relates to the field of optical imaging, and in particular, to an optical system and an electronic device.

Background

The leading camera setting of cell-phone is in the positive forehead district of cell-phone, perhaps with leading camera setting at the trompil region of display screen, perhaps with leading camera setting under the display screen and stretch out when using, these modes all avoid leading camera to form images through acquireing the light that passes the display screen when shooing, and one of the reason lies in when forming images with leading camera setting under the screen, and light can produce diffraction effect when passing the display screen, and the phenomenon similar starburst can appear in the image that the leading camera received the light after the diffraction, and the formation of image quality is lower.

Disclosure of Invention

The embodiment of the application provides an optical system and an electronic device.

The present disclosure provides an optical system, which includes, in order from an object side to an image side, a display screen, a microlens array, a lens module, and an image sensor; the display screen comprises a plurality of pixel units which are arranged periodically, each pixel unit forms a diffraction unit, and incident light rays generate diffraction effect through the display screen to form diffraction light rays; the micro lens array is arranged below the display screen and comprises a plurality of micro lenses which are periodically arranged and used for collimating the diffracted light; the lens module is used for converging light rays collimated by the micro lenses on the image sensor, and the image sensor is used for converting the converged light rays into electric signals to form images.

In some embodiments, a plurality of the microlenses are uniformly distributed to form the microlens array.

In some embodiments, the number of the microlens arrays is one, wherein each microlens corresponds to one diffraction unit; or each microlens corresponds to a plurality of diffraction units; or a plurality of the micro lenses correspond to one diffraction unit; or a first number of the microlenses corresponds to a second number of the diffraction units, the first number is different from the second number, and the first number and the second number are both multiple.

In some embodiments, the optical system further comprises a beam splitting prism, the microlens array comprising a first microlens array, a second microlens array, and a third microlens array, from an object side to an image side, the beam splitter prism, the first micro lens array, the second micro lens array and the third micro lens array are sequentially arranged between the display screen and the lens module, the beam splitter prism is used for separating red light, green light and blue light in the diffracted light from the area, the first microlens array is used for collimating only red light rays in the diffracted light rays, the second microlens array is used for collimating only green light rays in the diffracted light rays and keeping the red light rays in the diffracted light rays collimated, the third microlens array is used for collimating only blue light rays in the diffracted light rays and keeping red light rays and green light rays in the diffracted light rays collimated.

In some embodiments, the plurality of microlenses on each of the microlens arrays includes first area microlenses, second area microlenses, and third area microlenses; the first area microlenses in the first microlens array are used for collimating red light rays in the diffracted light rays; the second area microlenses in the second microlens array are used for collimating green light rays in the diffracted light rays, and the first area microlenses in the second microlens array are used for keeping red light rays in the diffracted light rays collimated; the third area microlenses in the third microlens array are used for collimating blue light rays in the diffracted light rays, the first area microlenses in the third microlens array are used for keeping red light rays in the diffracted light rays collimated, and the second area microlenses in the third microlens array are used for keeping green light rays in the diffracted light rays collimated.

In some embodiments, the number of the microlens array is one, the optical system further includes a beam splitter prism disposed between the display screen and the microlens array, the beam splitter prism is configured to separate red light, green light, and blue light from the diffracted light, the microlens array includes a first area microlens, a second area microlens, and a third area microlens, the first area microlens is configured to collimate red light of the diffracted light, the second area microlens is configured to collimate green light of the diffracted light, and the third area microlens is configured to collimate blue light of the diffracted light.

In some embodiments, projections of the first, second, and third area microlenses on a plane of the image sensor correspond to a first area, a second area, and a third area, respectively, and the first area, the second area, and the third area are sequentially connected or sequentially spaced apart.

In some embodiments, the lens module includes a lens base, a lens barrel and a lens, and the image sensor is disposed in the lens base; the lens cone is arranged on the lens base and is provided with a light through hole, and the light through hole is used for supplying light rays passing through the micro lens array; the lens is arranged in the lens barrel, and light rays entering from the light through hole are converged on the image sensor by the lens.

In some embodiments, the lens module further includes an infrared filter disposed between the image sensor and the lens.

The embodiment of the present application further provides an electronic device, where the electronic device includes a housing and the optical system of any one of the above embodiments, and the optical system is disposed on the housing.

The optical system and the electronic equipment of the embodiment of the application are provided with the microlens array formed by the periodically arranged microlenses between the display screen and the lens module, and the diffraction light generated by the display screen is completely converged on the image sensor by the microlens array and the lens module, so that the phenomenon of similar starburst of the diffraction light during imaging is avoided, and the imaging quality is improved.

Drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural diagram of an electronic device according to some embodiments of the present application;

FIG. 2a is a schematic plan view of an optical system according to some embodiments of the present application;

FIG. 2b is a schematic perspective view of the optical system shown in FIG. 2 a;

FIG. 2c is a schematic plan view of the lenses of the lens module in the optical system shown in FIG. 2 a;

FIG. 3 is a schematic plan view of an optical system according to certain embodiments of the present application;

FIG. 4 is a schematic plan view of an optical system according to certain embodiments of the present application;

FIG. 5 is a schematic plan view of an optical system according to certain embodiments of the present application;

FIG. 6 is a schematic plan view of an optical system according to certain embodiments of the present application;

FIG. 7 is a schematic plan view of an optical system according to certain embodiments of the present application;

FIG. 8 is a schematic plan view of an optical system according to some embodiments of the present application.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the embodiments of the present application, and are not to be construed as limiting the embodiments of the present application.

Referring to fig. 1 and fig. 2a, an electronic device 100 according to an embodiment of the present disclosure includes a housing 110 and an optical system 120 disposed on the housing 110. The optical system 220 includes, in order from an object side to an image side, a display screen 221, a micro lens array 222, a lens module 223, and an image sensor 224; the display screen 221 includes a plurality of pixel units arranged periodically, each pixel unit forms a diffraction unit 2211, and incident light is diffracted by the display screen 221 to form diffracted light; the microlens array 222 is disposed under the display screen 221, the microlens array 222 includes a plurality of microlenses 2221 arranged periodically, and the plurality of microlenses 2221 are used for collimating the diffracted light; the lens module 223 is configured to converge the light collimated by the plurality of microlenses 2221 on the image sensor 224, and the image sensor 224 is configured to convert the converged light into an electrical signal for imaging.

In the electronic device 100, the microlens array 222 formed by the periodically arranged microlenses 2221 is arranged between the display screen 221 and the lens module 223, and the diffracted light passing through the display screen 221 is all converged onto the image sensor 224 by using the microlens array 222 and the lens module 223, so that a phenomenon similar to starburst during imaging of the diffracted light is avoided, and the imaging quality is improved.

Specifically, referring to fig. 1, the electronic device 100 may be a mobile phone, a tablet computer, a laptop computer, a game machine, a head-mounted display device, an access control system, a teller machine, and the like, and the electronic device 100 is taken as an example for illustration in the present application, it is understood that the specific form of the electronic device 100 may be other, and is not limited herein.

The housing 110 may be a casing of the electronic device 100, such as a middle frame and a back cover of a mobile phone. The housing 110 can be used as a mounting carrier for functional elements (such as a display screen, a camera, a processor, a receiver, a power module, a communication module, and the like) and a motherboard of the electronic device 100, and the housing 110 can provide protection for the functional elements and the motherboard against dust, falling, water, and the like. The electronic device 100 may further include a cover plate 130, the cover plate 130 may be made of a transparent material such as glass, sapphire, resin, and the like, and a touch sensing layer may be further integrated on the cover plate 130 to sense a touch operation of a user on the cover plate 130. The cover plate 130 and the housing 110 may jointly form a containing cavity, and the optical system 120 may be contained in the containing cavity, so that the optical system 120 is not easily affected by moisture and dust. The housing 110 may be a straight plate, and the housing 110 may include a fixed portion and a movable portion that are slidable relative to each other, so that the movable portion may be switched between an extended state and a retracted state; the housing 110 may also include a plurality of housings that are rotatable relative to each other so that the housing 110 can be switched between folded and unfolded states. Referring to fig. 1, fig. 2a and fig. 2b, from the object side to the image side, the optical system 220 of the present embodiment sequentially includes a display screen 221, a microlens array 222, a lens module 223 and an image sensor 224.

The display screen 221 is installed on the housing 110 and located below the cover plate 130, and the display screen 221 may be configured to emit an optical signal, and the optical signal passes through the cover plate 130 and enters the outside of the electronic device 100, so that the display screen 221 is configured to display pictures, videos, texts, and the like. Specifically, the display screen 221 may be mounted on one face of the housing 110, for example, on one of a front face, a rear face, or a side face of the housing 110; the display screen 221 may be installed on two sides of the housing 110, for example, the display screen 221 is installed on the front side and the back side of the housing 110; the display screen 221 may also be mounted on more than two sides of the housing 110, for example, the display screen 221 may be mounted on the front, back and side of the housing 110. In the example shown in fig. 1, the display screen 221 is mounted on the front surface of the housing 110, and the area of the display screen 221 may cover 85% or more of the area of the front surface, for example, 85%, 87%, 91%, 92%, 93%, 95%, 97%, 99%, or even 100%. The overall shape of the display 221 may be rectangular, circular, oval, racetrack, rounded rectangle, triangular, etc., without limitation.

The display screen 221 includes a plurality of pixel units arranged periodically, each pixel unit constitutes a diffraction unit 2211, and incident light is diffracted by the display screen 221 to form diffracted light. Specifically, the display screen 221 includes a plurality of pixel units, one pixel unit constituting one diffraction unit 2211, each pixel unit including a plurality of sub-pixels. A plurality of sub-pixels included in one pixel unit emit light of a predetermined color, respectively, thereby forming light emitted by the pixel. For example, each pixel unit may include a red (R) sub-pixel, a green (G) sub-pixel, and a blue (B) sub-pixel. In another example, each pixel unit may include an R sub-pixel, a G sub-pixel, a B sub-pixel, and a white (W) sub-pixel. It should be understood that each pixel cell has a different sub-pixel scheme based on different display principles, and each pixel cell may include other numbers of sub-pixels or other colors of sub-pixels. The embodiments of the present application can be adapted to various sub-pixel schemes. In addition, the display screen 221 may be an Organic Light-Emitting Diode (OLED) display screen, and the OLED display screen has good Light transmittance and can pass visible Light and infrared Light. Therefore, the OLED display screen does not affect the image sensor 224 to receive light when displaying pictures, videos, texts, etc. The display screen 221 may also be a Micro LED display screen.

The microlens array 222 is disposed under the display 221, the microlens array 222 includes a plurality of microlenses 2221 arranged periodically, the plurality of microlenses 2221 are used for collimating diffracted light, and the plurality of microlenses 2221 are uniformly distributed to form the microlens array 222. Specifically, the microlens array 222 is disposed between the display screen 221 and the lens module 223, and the shape of the microlens array 222 may be a regular polygon, a rectangle (as shown in fig. 2 b), a circle, or the like. The microlens array 222 is used to collimate the diffraction light of a specific order into parallel light, which is caused by the diffraction effect of the diffraction unit 2211 of the display screen 221, wherein the diffraction light of the specific order is similar to the diffraction light of different orders generated by the light transmission grating (i.e. the light transmission grating generates diffraction light of 0 order, ± 1 order, ± 2 order etc.), so the diffraction light of the specific order may be diffraction light of 0 order, ± 1 order, ± 2 order etc., generally, the diffraction light of 0 order does not need to be collimated by the microlens array 222, and can be directly projected onto the image sensor 224 through the microlens array 222 and the lens module 223, while the diffraction light of ± 1 order, ± 2 order etc. needs to be collimated by the microlens array 222, and the energy of diffraction light of ± 1 order is the highest, i.e. the diffraction effect generated by diffraction light of ± 1 order is the strongest, therefore, the specific level here generally means that the microlens array 222 collimates the ± 1 st-order diffraction light, and the ± 2 nd-order, the ± 3 rd-order diffraction light and other levels may also be properly collimated, so that the diffraction effect generated by the ± 2 nd-order, the ± 3 rd-order and other levels is weakened, thereby realizing that only one pixel point is displayed in the image sensor 224, and further improving the imaging quality.

In some embodiments, the number of microlens arrays 222 is one, wherein: each microlens 2221 corresponds to one diffraction cell 2211; or each microlens 2221 corresponds to a plurality of diffraction cells 2211; or a plurality of microlenses 2221 corresponding to one diffraction cell 2211; or the first number of microlenses 2221 corresponds to the second number of diffraction cells 2211, the first number is different from the second number, and the first number and the second number are both multiple.

That is, when one microlens array 222 is used and the microlens array 222 is disposed between the display screen 221 and the lens module 223, the correspondence relationship between the microlenses 2221 in the microlens array 222 and the diffraction units 2211 in the display screen 221 includes: one-to-one, i.e., one diffraction cell 2211 for each microlens 2221; two to many, i.e., each microlens 2221 corresponds to a plurality of diffraction cells 2211, e.g., 1 microlens 2221 corresponds to 3 diffraction cells 2211; ③ many-to-one, i.e. a plurality of microlenses 2221 correspond to one diffraction unit 2211, for example, 3 microlenses 2221 correspond to 1 diffraction unit 2211; many-to-many, the first number of microlenses 2221 corresponds to the second number of diffraction cells 2211, the first number is different from the second number, and the first number and the second number are both multiple. For example, the first number is 3 and the second number is 2, i.e., 3 microlenses 2221 correspond to 2 diffraction cells 2211.

Specifically, in some embodiments, referring to fig. 3, the number of the microlens array 322 is one, and each microlens 3221 corresponds to one diffraction unit 3211. Each microlens 3221 of the microlens array 322 is arranged in one-to-one correspondence with the diffraction units 3211 on the display screen 321, and after light rays incident from each diffraction unit 3211 pass through the corresponding microlens 3221 in the microlens array 322, collimated light rays are formed, so that the imaging quality of the optical system 320 is improved.

In some embodiments, referring to fig. 4, 1 microlens 4221 of the microlens array 422 corresponds to 3 diffraction units 4211 on the display screen 421, i.e., one microlens 4221 corresponds to a plurality of diffraction units 4211. Each 1 microlens 4221 of the microlens array 422 is arranged corresponding to 3 diffraction units 4211 on the display screen 421, and light rays incident from each 3 diffraction units 4211 form collimated light rays after passing through the corresponding microlens 4221 in the microlens array 422, so that the imaging quality of the optical system 420 is improved.

In some embodiments, referring to fig. 5, 3 microlenses 5221 of the microlens array 522 correspond to 1 diffraction cell 5211 on the display screen 521, i.e., a plurality of microlenses 5221 correspond to one diffraction cell 5211. Each 3 microlenses 5221 of the microlens array 522 is disposed corresponding to 1 diffractive unit 5211 on the display screen 521, and the light incident from each 1 diffractive unit 5211 passes through the corresponding microlens 5221 of the microlens array 522 to form collimated light, thereby improving the imaging quality of the optical system 520.

In some embodiments, referring to fig. 6, each 5 or 4 microlenses 6221 of the microlens array 622 corresponds to 3 diffractive units 6211 on the display 621 (as shown by the dashed box in fig. 6). That is, the plurality of microlenses 6221 correspond to the plurality of diffraction units 6211. The 5 microlenses 6221 of the microlens array 622 are disposed corresponding to the 3 diffractive units 6211 on the display 621, and the light incident from each of the 3 diffractive units 6211 passes through the corresponding microlens 6221 in the microlens array 622 to form collimated light, thereby improving the imaging quality of the optical system 620.

Referring to fig. 2a, the lens module 223 is used for converging the light collimated by the plurality of microlenses 2221 on the microlens array 222 onto the image sensor 224. Specifically, the lens module 223 includes a lens mount 2231, a lens barrel 2232, and a lens 2233. The image sensor 224 is disposed in the lens holder 2231. The lens barrel 2232 is installed on the lens base 2231 and is provided with a light-passing hole 2234, and the light-passing hole 2234 is used for passing through the collimated light after passing through the microlens array 222. The lens 2233 is disposed in the lens barrel 2232, and the collimated light entering from the light-passing hole 2234 is converged by the lens 2233 onto the image sensor 224.

The number of the lenses 2233 may be one, and the lenses 2233 are convex lenses or concave lenses; the number of the lenses 2233 may be plural (e.g., two, three, or more than three), and the plural lenses 2233 may be all convex lenses or concave lenses, or partly convex lenses and partly concave lenses. In this embodiment, two lenses 2233 are provided. Lens 2233 may be a glass lens or a plastic lens.

One or more of lenses 2233 may be all part of a solid of revolution, or part of a solid of revolution and part of a solid of revolution. In the present embodiment, each lens 2233 is a part of a solid of revolution. For example, as shown in fig. 2c, lens 2233 is first formed by molding revolved lens S1, revolved lens S1 is circular in shape sectioned by a plane perpendicular to the optical axis, the diameter of the circle being R, and then the edge of revolved lens S1 is cut to form lens 2233. The shape of the lens 2233 cut by a plane perpendicular to the optical axis is a rectangle whose two sides are T1 and T2, T1/R e [0.5,1), T2/R e [0.5,1), for example, T1/R may be 0.55, 0.6, 0.7, 0.75, 0.8, 0.95, etc., and T2/R may be 0.5, 0.65, 0.7, 0.75, 0.85, 0.9, etc. It will be appreciated that the specific ratios of T1/R and T2/R are determined based on factors such as the size of the interior space of electronic device 100, the optical parameters of optical system 220 (e.g., the size of the effective optical area of lens 2233), and the like. Alternatively, one or more of the lenses 2233 can be directly formed using a specially designed mold having a mold cavity that is part of a solid of revolution having the specific ratios of T1/R and T2/R determined, thereby directly forming the lens 2233. In this manner, lens 2233 is a portion of revolved lens S1 that is smaller in volume than full revolved lens S1, thereby reducing the overall volume of optical system 220 and making more room for other components in electronic device 100.

In some embodiments, referring to fig. 2a again, the lens module 223 may further include an infrared filter 2235, and the infrared filter 2235 is disposed between the image sensor 224 and the lens 2233. The infrared filter 2235 is used to filter out infrared light and allow visible light other than infrared light to pass through.

Referring to fig. 2a again, the image sensor 224 is installed at the image side of the optical system 220, and the image sensor 224 is used for converting the light converged by the lens 2233 into an electrical signal for imaging. The image sensor 224 may be a Complementary Metal Oxide Semiconductor (CMOS) image sensor or a Charge-coupled Device (CCD) image sensor.

The pixel units arranged periodically can be equivalent to a diffraction grating (as the diffraction unit 2211) for incident light, and if a beam of parallel light from the outside passes through the display screen 221 without intervention and is directly focused on an imaging surface by the lens 2233, a plurality of image points exist on the imaging surface. For imaging, only 0 order is the effective information we need, while other orders of ± 1, ± 2, etc. are stray light (interference signal). In the optical system 220 of the embodiment of the present application, the microlens array 222 formed by the periodically arranged microlenses 2221 is disposed between the display screen 221 and the lens module 223, and the microlens array 222 and the lens module 223 are used together to converge all the diffracted lights generated after passing through the display screen 221 onto the image sensor 224 to form an image point, so that a phenomenon similar to starburst of the diffracted lights during imaging is avoided, and the imaging quality is improved.

Referring to fig. 7, in some embodiments, the optical system 720 further includes a beam splitting prism 725, and the microlens array 722 includes a first microlens array 726, a second microlens array 727, and a third microlens array 728. The beam splitter 725, the first microlens array 726, the second microlens array 727 and the third microlens array 728 are sequentially disposed between the display 721 and the lens module 723 from the object side to the image side. The beam splitter prism 725 is used to separate red, green and blue light rays from the diffracted light rays, the first microlens array 726 is used to collimate only the red light rays in the diffracted light rays, the second microlens array 727 is used to collimate only the green light rays in the diffracted light rays and keep the red light rays in the diffracted light rays collimated, and the third microlens array 728 is used to collimate only the blue light rays in the diffracted light rays and keep the red and green light rays in the diffracted light rays collimated.

The microlenses 7221 on each microlens array 722 include first, second, and third area microlenses. The first area microlenses 7262 in the first microlens array 726 are for collimating the red light rays of the diffracted light rays; the second area microlenses 7273 in the second microlens array 727 are used for collimating green light rays in the diffracted light rays, and the first area microlenses 7272 in the second microlens array 727 are used for keeping the red light rays in the diffracted light rays collimated; third area microlenses 7284 in third microlens array 728 are used to collimate blue light in the diffracted light, first area microlenses 7282 in third microlens array 728 are used to keep collimated red light in the diffracted light, and second area microlenses 7283 in third microlens array 728 are used to keep collimated green light in the diffracted light.

Specifically, the external light passes through the diffraction unit 7211 on the display screen 721 to form diffracted light, and the diffracted light is divided into red light (R), green light (G) and blue light (B) by the beam splitter prism 725, so that the three colors of light are projected on the first microlens array 726 to form three different microlens regions corresponding to the three colors, that is, the first region microlens 7262, the second region microlens 7263 and the third region microlens 7264, respectively. Also, the first microlens array 726 serves to collimate only the red light of the diffracted light, that is, the first area microlenses 7262 in the first microlens array 726 collimate the red light of the diffracted light, while the second area microlenses 7263 and the third area microlenses 7264 have no collimating effect on the three colors. The second microlens array 727 serves to collimate only green light rays of the diffracted light rays and to keep the red light rays of the diffracted light rays collimated, that is, the first area microlenses 7272 of the second microlens array 727 keep the red light rays collimated by the first area microlenses 7262 collimated, the second area microlenses 7273 collimate the green light rays of the diffracted light rays, and the third area microlenses 7274 have no collimating effect on three colors. The third microlens array 728 collimates only the blue light of the diffracted light and keeps the red light and the green light of the diffracted light collimated, that is, the first area microlens 7282 of the third microlens array 728 keeps the collimated red light passing through the first area microlens 7262 and the first area microlens 7272 collimated, the second area microlens 7283 keeps the collimated green light passing through the second area microlens 7273 collimated, and the third area microlens 7284 collimates the blue light of the diffracted light. Finally, the light rays of the three colors are collimated, and the collimated light rays are converged by the lens module 723 and then projected onto the image sensor 724, so that the phenomenon that diffraction light rays are similar to starburst during imaging is avoided, and the imaging quality is improved.

The projections of the first, second and

third microlenses

7262, 7263, 7264 on the image sensor 724 correspond to the first, second and third regions, respectively, which are sequentially connected or sequentially spaced apart.

The projections of the first, second and

third area microlenses

7272, 7273 and 7274 on the image sensor 724 correspond to the first, second and third areas, respectively, which are sequentially connected or sequentially spaced apart.

The projections of the first, second, and

third area microlenses

7282, 7283, and 7284 on the image sensor 724 correspond to the first, second, and third areas, respectively, which are sequentially connected or sequentially spaced apart.

Further, the display screen 721 and the three microlens arrays 722 are disposed in sequence, and the three microlens arrays 722 are parallel to each other. The optical system 720 is provided with a beam splitter 725 and three micro lens arrays 722 below the display 721, the beam splitter 725 is used to separate red light, green light and blue light from the diffracted light, and the three micro lens arrays 722 are used to collimate the red light, the green light and the blue light in sequence, so that the mutual crosstalk of the diffracted light in the collimation process can be reduced, the field angle can be increased, and the imaging quality can be further improved.

Referring to fig. 8, in some embodiments, the optical system 820 further includes a beam splitter 825, the number of the microlens arrays 822 is one, the beam splitter 825 is disposed between the display 821 and the microlens array 822, the beam splitter 825 is configured to separate red light, green light, and blue light in the diffracted light from regions, the microlens array 822 includes a first region microlens 8222, a second region microlens 8223, and a third region microlens 8224, the first region microlens 8222 is configured to collimate the red light in the diffracted light, the second region microlens 8223 is configured to collimate the green light in the diffracted light, and the third region microlens 8224 is configured to collimate the blue light in the diffracted light.

The projections of the first, second, and

third area microlenses

8222, 8223, 8224 on the image sensor 824 correspond to the first, second, and third areas, respectively, and the first, second, and third areas are sequentially connected or sequentially spaced apart.

The optical system 820 is provided with a beam splitter prism 825 and a micro lens array 822 below the display screen 821, so that red light, green light and blue light in the diffracted light are separated from the area by the beam splitter prism 825, and then the red light, the green light and the blue light are collimated by the micro lens array 822, thereby reducing the mutual crosstalk of the diffracted light in the collimation process, increasing the field angle and further improving the imaging quality.

In the description herein, reference to the description of the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

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

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art within the scope of the present application, which is defined by the claims and their equivalents.

Claims

1. An optical system is characterized by comprising a display screen, a micro lens array, a lens module and an image sensor in sequence from an object side to an image side; wherein:

the display screen comprises a plurality of pixel units which are arranged periodically, each pixel unit forms a diffraction unit, and incident light rays generate diffraction effect through the display screen to form diffraction light rays;

the micro lens array is arranged below the display screen and comprises a plurality of micro lenses which are periodically arranged, and the micro lenses are used for collimating the diffraction light rays of a specific level which generate the diffraction effect due to the diffraction unit of the display screen into parallel light; the lens module is used for converging light rays collimated by the micro lenses on the image sensor, and the image sensor is used for converting the converged light rays into electric signals to form images.

2. The optical system of claim 1, wherein a plurality of said microlenses are uniformly distributed to form said microlens array.

3. The optical system of claim 2, wherein the number of the microlens arrays is one, wherein:

each microlens corresponds to one diffraction unit; or

Each microlens corresponds to a plurality of diffraction units; or

A plurality of the microlenses correspond to one of the diffraction units; or

The first number of the microlenses corresponds to the second number of the diffraction units, the first number is different from the second number, and the first number and the second number are both multiple.

4. The optical system according to claim 1, further comprising a beam splitter prism, wherein the microlens arrays comprise a first microlens array, a second microlens array and a third microlens array, the beam splitter prism, the first microlens array, the second microlens array and the third microlens array are sequentially arranged between the display screen and the lens module from an object side to an image side, the beam splitter prism is used for separating red light, green light and blue light in the diffracted light from regions, the first microlens array is used for collimating only the red light in the diffracted light, the second microlens array is used for collimating only the green light in the diffracted light and keeping the red light in the diffracted light collimated, and the third microlens array is used for collimating only the blue light in the diffracted light and keeping the red light and the green light in the diffracted light quasi-aligned Straight.

5. The optical system of claim 4, wherein the plurality of microlenses on each of the microlens arrays includes first area microlenses, second area microlenses, and third area microlenses; the first area microlenses in the first microlens array are used for collimating red light rays in the diffracted light rays; the second area microlenses in the second microlens array are used for collimating green light rays in the diffracted light rays, and the first area microlenses in the second microlens array are used for keeping red light rays in the diffracted light rays collimated; the third area microlenses in the third microlens array are used for collimating blue light rays in the diffracted light rays, the first area microlenses in the third microlens array are used for keeping red light rays in the diffracted light rays collimated, and the second area microlenses in the third microlens array are used for keeping green light rays in the diffracted light rays collimated.

6. The optical system according to claim 1, wherein the number of the microlens array is one, the optical system further comprises a beam splitter prism, the beam splitter prism is disposed between the display screen and the microlens array, the beam splitter prism is configured to separate red light, green light, and blue light from the diffracted light, the microlens array comprises a first area microlens, a second area microlens, and a third area microlens, the first area microlens is configured to collimate red light of the diffracted light, the second area microlens is configured to collimate green light of the diffracted light, and the third area microlens is configured to collimate blue light of the diffracted light.

7. The optical system according to claim 5 or 6, wherein the projections of the first, second, and third area microlenses on the plane of the image sensor correspond to a first area, a second area, and a third area, respectively, and the first, second, and third areas are sequentially connected or sequentially spaced apart.

8. The optical system of claim 1, wherein the lens module comprises:

the lens base is internally provided with the image sensor;

the lens cone is arranged on the lens base and is provided with a light through hole, and the light through hole is used for supplying light rays passing through the micro lens array; and

and the lens is arranged in the lens barrel, and the light rays entering from the light through hole are converged on the image sensor by the lens.

9. The optical system of claim 1, wherein the lens module further comprises:

and the infrared filter is arranged between the image sensor and the lens.

10. An electronic device, comprising:

the optical system of any one of claims 1 to 9;

a housing on which the optical system is disposed.