CN110401746B

CN110401746B - Terminal device

Info

Publication number: CN110401746B
Application number: CN201910653632.0A
Authority: CN
Inventors: 杨鑫
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2021-08-31
Anticipated expiration: 2039-07-19
Also published as: CN110401746A

Abstract

The application discloses a terminal. The terminal comprises a display device, an imaging device and an anti-reflection device, wherein the display device comprises a display area; the imaging device is aligned with the display area; the reflection increasing device is positioned between the display device and the imaging device, the imaging device is used for receiving optical signals which successively pass through the display area and the reflection increasing device for imaging, the reflection increasing device comprises a reflection increasing unit, and the reflection increasing unit is used for increasing the energy of the reflected optical signals reaching the reflection increasing unit. The optical signal received by the imaging device and used for imaging passes through the display area and the reflection increasing device in sequence, the reflection increasing unit is arranged to increase the interference optical signal in the optical signal diffracted by the display device, the energy reflected by the reflection increasing unit is reduced, the energy of the interference optical signal passing through the reflection increasing unit is reduced, the influence of the interference optical signal on the imaging of the imaging device is reduced, and the imaging quality of the imaging device arranged below the display device is improved.

Description

Terminal device

Technical Field

The application relates to the technical field of imaging, in particular to a terminal.

Background

The front camera of cell-phone sets up in the positive forehead district of cell-phone, perhaps with the front camera setting at the trompil region of display screen, perhaps with the front camera setting under the display screen and stretch out when using, these modes all avoid the front camera to form images through acquireing the light that passes the display screen when shooing, and one of the reasons lies in setting up the front camera and when forming images under the screen, and light passes the display screen and can take place the diffraction, and the light that the front camera received after the diffraction is formed images, and the quality of formation of image is lower.

Disclosure of Invention

The embodiment of the application provides a terminal.

The terminal of the embodiment of the application comprises a display device, an imaging device and a reflection increasing device, wherein the display device comprises a display area; the imaging device is arranged in alignment with the display area; the reflection increasing device is positioned between the display device and the imaging device, the imaging device is used for receiving optical signals which sequentially pass through the display area and the reflection increasing device for imaging, the reflection increasing device comprises a reflection increasing unit, and the reflection increasing unit is used for increasing the energy of the reflected optical signals reaching the reflection increasing unit.

In some embodiments, the reflection increasing device further includes a transparent substrate, the number of the reflection increasing units is plural, the plural reflection increasing units are disposed on the substrate, each reflection increasing unit is in a ring shape, and the plural reflection increasing units are disposed concentrically and spaced from each other.

In certain embodiments, the reflection increasing unit comprises a plurality of reflection increasing films arranged in a stacked manner.

In some embodiments, the thicknesses of the reflection increasing films of the same reflection increasing unit are different.

In certain embodiments, each of the reflection enhancing films has a thickness of [47.5, 95] nanometers.

In some embodiments, the thickness of the same reflection increasing unit gradually increases along the direction of the periphery to approach the central axis.

In some embodiments, the reflection increasing means is provided on the display means; the reflection increasing unit and the display device are respectively positioned on two sides of the base body, which are opposite to each other; or the substrate and the display device are respectively positioned on two sides of the reflection increasing unit, which are opposite to each other.

In some embodiments, the imaging device includes a lens, the reflection increasing device is disposed on the lens; the reflection increasing unit and the lens are respectively positioned on two sides of the base body, which are opposite to each other; or the substrate and the lens are respectively positioned on two sides of the reflection increasing unit, which are back to each other.

In some embodiments, the reflection increasing unit closest to the central axis encloses a transmission area on the substrate, the transmission area being used for a 0-order light beam of the light signal passing through the display area to pass through.

In some embodiments, an anti-reflection device is disposed on the transmission region, and the anti-reflection device is configured to enhance energy of an optical signal transmitted through the anti-reflection device.

In the terminal of the embodiment of the application, the optical signal received by the imaging device and used for imaging passes through the display area and the reflection increasing device in sequence, the reflection increasing unit is arranged to increase the interference optical signal in the optical signal diffracted by the display device, the energy reflected by the reflection increasing unit is reduced, the energy of the interference optical signal passing through the reflection increasing unit is reduced, the influence of the interference optical signal on the imaging of the imaging device is reduced, and the imaging quality of the imaging device arranged below the display device is improved.

Additional aspects and advantages of embodiments of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the present application.

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 a terminal according to an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of the terminal shown in FIG. 1 taken along line II-II;

fig. 3 to 5 are schematic structural views of a terminal according to an embodiment of the present application;

FIG. 6 is a schematic plan view of a reaction increasing device according to an embodiment of the present application;

FIG. 7 is a schematic cross-sectional view of the reflection increasing apparatus shown in FIG. 6 taken along line VII-VII;

FIG. 8 is a diagram showing a light intensity distribution of a diffracted light signal according to an embodiment of the present application;

FIG. 9 is a schematic diagram of the reflection of a diffracted light signal by an incremental reflective element according to an embodiment of the present application;

FIG. 10 is a schematic waveform diagram of an optical signal according to an embodiment of the present application;

fig. 11 and 12 are schematic cross-sectional views of a reflection increasing device according to an embodiment of the present application;

FIG. 13 is a schematic cross-sectional view of a display device in accordance with an embodiment of the present application in cooperation with a reflection increasing device;

FIG. 14 is a schematic cross-sectional view of an imaging device in accordance with an embodiment of the present application in cooperation with a contrast enhancement device;

FIG. 15 is a schematic cross-sectional view of a reflection increasing device and an anti-reflection device according to an embodiment of the present disclosure.

Description of the main element symbols:

the terminal 100, the housing 10, the accommodating cavity 11, the display device 20, the display area 21, the imaging device 30, the lens 31, the reflection increasing device 40, the reflection increasing unit 41, the reflection increasing film 411, the base 42, the transmission area 421, the cover plate 50, the reflection increasing device 60, and the central axis Z.

Detailed Description

Embodiments of the present application will be further described below with reference to the accompanying drawings. The same or similar reference numbers in the drawings identify the same or similar elements or elements having the same or similar functionality throughout.

In addition, the embodiments of the present application described below in conjunction with the accompanying drawings are exemplary and are only for the purpose of explaining the embodiments of the present application, and are not to be construed as limiting the present application.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1 and 2, a terminal 100 according to an embodiment of the present disclosure includes a display device 20, an imaging device 30, and a reflection increasing device 40. The display device 20 includes a display area 21. The imaging device 30 is disposed in alignment with the display area 21. The image forming device 30 is used for receiving the light signal passing through the display area 21 and the image increasing and reversing device 40 in sequence for image formation. Referring to fig. 7, the reflection increasing device 40 includes a reflection increasing unit 41, and the reflection increasing unit 41 is used for increasing the reflected energy of the optical signal reaching the reflection increasing unit 41.

In the terminal 100, the optical signal received by the imaging device 30 and used for imaging passes through the display area 21 and the reflection increasing device 40 in sequence, and the reflection increasing unit 41 is arranged to increase the interference optical signal in the optical signal diffracted by the display device 20, so that the energy reflected by the reflection increasing unit 41 reduces the energy of the interference optical signal passing through the reflection increasing unit 41, thereby reducing the influence of the interference optical signal on the imaging of the imaging device 30 and improving the imaging quality when the imaging device 30 is arranged below the display device 20.

Specifically, referring to fig. 1 and 2, a terminal 100 according to an embodiment of the present disclosure includes a housing 10, a display device 20, an imaging device 30, and a reflection increasing device 40. The specific form of the terminal 100 may be a mobile phone, a tablet computer, a display, a notebook computer, a smart watch, a head display device, a game machine, a teller machine, etc., and the application takes the example that the terminal 100 is a mobile phone as an example, it is understood that the specific form of the terminal 100 is not limited to a mobile phone, and is not limited herein.

The casing 10 may be a housing of the terminal 100, such as a middle frame and a rear cover of a cellular phone. The housing 10 may be used to mount components such as the display device 20, the imaging device 30, and the image enhancement device 40, and in addition, the housing 10 may also be used to mount components such as a main board, a processing chip, a power module, and a communication module of the terminal 100. The terminal 100 may further include a cover plate 50, the cover plate 50 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 50 to sense a touch operation of a user on the cover plate 50. The cover plate 50 and the housing 10 may together form a receiving cavity 11, and the display device 20, the image forming device 30 and the reflection increasing device 40 may be received in the receiving cavity 11, so that the display device 20, the reflection increasing device 40 and the image forming device 30 are not easily affected by moisture and dust. The whole casing 10 may be a straight plate, and the casing 10 may include a fixed part and a movable part that can slide relatively, so that the movable part can be switched between an extended state and a retracted state; the housing 10 may also include a plurality of relatively rotatable housings such that the housing 10 may be switched between folded and unfolded states.

Referring to fig. 1 and 2, the display device 20 is mounted on the housing 10, and the display device 20 can be used to emit light signals, and the light signals pass through the cover plate 50 and enter the outside of the terminal 100, so that the display device 20 is used to display pictures, videos, texts, and the like. Specifically, the display device 20 may be mounted on one face of the casing 10, for example, on one face of a front face, a rear face, or a side face of the casing 10; the display device 20 may be installed on both sides of the casing 10, for example, the display device 20 is installed on both the front and back sides of the casing 10; the display device 20 may also be mounted on more than two sides of the housing 10, for example, the display device 20 may be mounted on the front, back and side of the housing 10 at the same time. In the example shown in fig. 1, the display device 20 is mounted on the front surface of the housing 10, and the area of the display area 21 of the display device 20 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 device 20 may be rectangular, circular, oval, racetrack, rounded rectangle, triangular, etc., without limitation. The display device 20 may be one of OLED display, Micro LED display, or liquid crystal display.

The display device 20 includes a display area 21, the display area 21 may be an area on the display device 20 for displaying a picture, and the shape of the display area 21 may be a rectangle, a circle, an ellipse, a racetrack shape, a rounded rectangle, a triangle, or the like. The display area 21 includes a plurality of microstructures such as display pixels and driving circuits of the display pixels, the microstructures are generally distributed in a regular periodic form, and the effect of the microstructures on the optical signal can be equivalent to the effect of the grating on the optical signal for the optical signal passing through the microstructures. When the optical signal passes through the microstructure of the display area 21, the optical signal is diffracted, so that the distribution of the light intensity and the like of the diffracted optical signal (hereinafter, referred to as a diffracted light signal) is different from the optical signal which does not pass through the display area 21.

In addition, in some examples, the display device 20 further includes a non-display area 21. The non-display area 21 may not have display pixels, and the non-display area 21 may not be used for displaying but for routing the driving circuit, and may be used for fixing and connecting with the chassis 10. The non-display area 21 may be formed at an outer edge of the display area 21, or may be located in any area surrounded by the display area 21, which is not limited herein.

Referring to fig. 1 and 2, the image forming apparatus 30 is installed in the housing 10. The imaging device 30 is disposed corresponding to the display area 21, and light signals received by the imaging device 30 and used for imaging pass through the display area 21. The imaging device 30 is disposed corresponding to the display area 21, and may be a light incident surface of the imaging device 30 facing the display area 21, and the light signal passes through the display area 21 and the reflection increasing device 40 in sequence and then is collected by the imaging device 30 and used for imaging, or the imaging device 30 is disposed below the display device 20 and aligned with the display area 21. Specifically, the imaging device 30 may correspond to any position of the display area 21, for example, the imaging device 30 shown in fig. 1 and 5 is aligned with a middle position of the display area 21 near the upper edge; or the imaging device 30 as shown in fig. 3 is aligned at a corner position where the upper edge and the side edge of the display area 21 meet; or the imaging device 30 as shown in fig. 4 is aligned at a middle position near the lower edge of the display area 21, or the like. Of course, the specific position of the display area 21 to which the imaging device 30 is aligned is not limited to the above example, and may be other positions, for example, the imaging device 30 may be aligned at a middle position of the display area 21 near the side edge, or the like.

Specifically, the imaging device 30 may be an imaging device 30 that performs imaging by using visible light signals passing through the display area 21 and the reflection increasing device 40, for example, the imaging device 30 is a color camera or a black-and-white camera; the imaging device 30 may also be an imaging device 30 that performs imaging using invisible light signals that pass through the display area 21 and the reflection increasing device 40, for example, the imaging device 30 is an infrared camera or an ultraviolet camera, etc.; the imaging device 30 may also be a receiving device in a depth camera, for example, the imaging device 30 is a light receiving device in a structured light depth camera, or a light receiving device in a Time of flight (TOF) depth camera, which is not limited herein. The present specification will describe an example in which the imaging device 30 receives a visible light signal to perform imaging.

When the display device 20 is mounted on the front surface of the cabinet 10, the image forming device 30 may be a front image forming device; when the display device 20 is mounted on the rear surface of the cabinet 10, the image forming device 30 may be a rear image forming device; of course, when the display device 20 is mounted on both the front and rear surfaces of the cabinet 10, the image forming device 30 may include both a front image forming device and a rear image forming device; when the display device 20 can be switched between the front and rear surfaces of the cabinet 10, the image forming device 30 can also be switched between being a front image forming device and a rear image forming device. The present specification exemplifies an image forming apparatus 30 as a front image forming apparatus.

The imaging device 30 may include a single camera disposed in correspondence with the display area 21 (e.g., as shown in fig. 1-3); the imaging device 30 may also include two cameras, both of which are disposed corresponding to the display area 21 (for example, as shown in fig. 4); the imaging device 30 may also include three cameras, which are all disposed corresponding to the display area 21; of course, the imaging device 30 may further include a plurality of cameras each disposed corresponding to the first display area 21.

Referring to fig. 2, 6 and 7, the reflection increasing device 40 is disposed between the display device 20 and the imaging device 30. In addition, in an example, the reflection increasing device 40 is further fixedly disposed on a light receiving path of the imaging device 30, and the optical signal needs to pass through the reflection increasing device 40 before entering the imaging device 30; in another example, the reflection increasing device 40 is movably disposed between the display device 20 and the imaging device 30, and the reflection increasing device 40 can be moved or rotated to the light receiving path of the imaging device 30 or the reflection increasing device 40 can be moved or rotated to the outside of the light receiving path of the imaging device 30 according to the user's requirement. In the embodiment of the present application, after the optical signal passes through the display area 21 of the display device 20, the optical signal passes through the reflection increasing device 40 to enter the imaging device 30. The reaction increasing device 40 includes a base 42 and a plurality of reaction increasing units 41.

The substrate 42 may be made of a material that is transparent to light, for example, the substrate 42 may be made of transparent glass, the substrate 42 may have a high transmittance for light signals, and the substrate 42 may not substantially weaken the intensity of light signals passing through the substrate 42. The direction in which the optical signal passes through the substrate 42 may coincide with the thickness direction of the substrate 42. The cross-sectional shape of the substrate 42 may be circular, rectangular, etc. In one example, the light incident surface and the light emitting surface of the substrate 42 are both planar, and the substrate 42 is a planar lens as a whole. In another example, at least one of the light incident surface and the light emitting surface of the substrate 42 is a non-planar surface, for example, both the light incident surface and the light emitting surface of the substrate 42 are convex curved surfaces, or one of the light incident surface and the light emitting surface of the substrate 42 is a convex curved surface and the other is a planar surface, so that the substrate 42 has a converging effect on the light passing through the substrate; for example, the light incident surface and the light emitting surface of the substrate 42 are both concave curved surfaces, or one of the light incident surface and the light emitting surface of the substrate 42 is a concave curved surface and the other is a plane, so that the substrate 42 has a diffusion effect on the light passing through the substrate. The substrate 42 may cover the entire light incident hole of the imaging device 30, or the substrate 42 may not completely cover the light incident hole of the imaging device 30, which is not limited herein.

Referring to fig. 6 and 7, the number of the increasing and decreasing units 41 may be single or multiple, the increasing and decreasing units 41 are disposed on the substrate 42, and the increasing and decreasing units 41 are used for increasing the energy reflected by the optical signal reaching the increasing and decreasing units 41. Specifically, when the number of the incremental and inverse units 41 is plural, the distribution manner among the incremental and inverse units 41 may be determined according to a pattern formed after the optical signal is diffracted by the microstructure of the display area 21, for example, before the terminal 100 leaves a factory, a test diffraction optical signal is formed through the display area 21 of the display device 20 by using a test optical signal, and the test diffraction optical signal includes a target optical signal and an interference optical signal, wherein the interference optical signal is a part of the optical signal that interferes with the imaging quality, and the amount of the interference optical signal entering the imaging device 30 is reduced, which is helpful for improving the imaging quality. By detecting the distribution of the disturbing light signals within the test diffracted light signals, the specific distribution pattern of the plurality of incremental reflective units 41 in the incremental reflective device 40 matched with the tested display device 20 can be determined. Therefore, the distribution of the plurality of reflection increasing units 41 can be determined according to the microstructure of the specific display device 20.

In the embodiment of the present application, each reflection increasing unit 41 has a circular ring shape, and a plurality of reflection increasing units 41 are disposed at intervals from each other and are concentric with the central axis Z. The different increasing and decreasing units 41 have different inner diameters, and the different increasing and decreasing units 41 have different outer diameters, and the different increasing and decreasing units 41 are spaced from each other. It is understood that the difference between the inner diameter and the outer diameter of the reflection increasing units 41, the distance between the adjacent reflection increasing units 41, and the like will be determined according to the microstructure of the display device 20, and are not limited herein. When the reflection increasing unit 41 is manufactured, a whole block of the reflection increasing material is manufactured on the substrate 42, an excess reflection increasing material is removed by photolithography, etching, or the like, and the remaining reflection increasing material forms the reflection increasing unit 41. When the reflection increasing unit 41 is manufactured, the reflection increasing material may be directly manufactured and disposed on the base 42 so that the reflection increasing material forms the reflection increasing unit 41.

Of course, in some embodiments, the substrate 42 may not be necessary, and the plurality of reflection increasing units 41 are directly disposed between the display device 20 and the imaging device 30.

The specific principle of the reflection increasing unit 41 for increasing the reflected energy of the disturbing optical signal will be described as follows:

referring to fig. 7, as described above, the light signal is diffracted when passing through the display area 21, the interference light signal in the diffracted light signal reaches the reflection increasing unit 41, a part of the interference light signal reaching the reflection increasing unit 41 is reflected by the reflection increasing unit 41, and another part of the interference light signal passes through the reflection increasing unit 41. The increasing and decreasing unit 41 increases the reflected energy of the disturbing light signal in the diffracted light signal, and since the energy of the disturbing light signal incident to the increasing and decreasing unit 41 is constant, the energy of the disturbing light signal passing through the increasing and decreasing unit 41 is decreased to decrease the energy of the disturbing light signal entering the imaging device 30.

In one example, referring to fig. 8(a), the diffracted light signals include a plurality of orders of light signals, wherein the 0 order light signal is a target light signal for imaging, and the remaining orders (± 1, ± 2, ± 3) of light signals are all interference light signals. The increasing and decreasing unit 41 may be used to decrease the energy of the interference light signal after passing through the increasing and decreasing unit 41.

Specifically, referring to fig. 9 and fig. 10, the total energy of the interference light signal Li is I, the interference light signal Li is incident into the reflection increasing unit 41, a part of the interference light signal Li passes through the reflection increasing unit 41 to form a transmission light Lt, a part of the interference light signal Li is reflected by the incident surface of the reflection increasing unit 41 to form a first reflection light L1, and a part of the interference light signal Li is reflected by the emergent surface of the reflection increasing unit 41 to form a second reflection light L2.

Taking the waveform of the incident disturbance light signal Li as an example as the waveform shown in fig. 10(a), where the horizontal axis is the phase and the vertical axis is the amplitude, the phase difference between the waveform of the first reflected light L1 (shown in fig. 10 (b)) and the waveform of the disturbance light signal Li is 0. Since the second reflected light L2 passes through the reflection increasing unit 41 twice more than the first reflected light L1, there may be a phase difference between the waveform of the second reflected light L2 (as shown in fig. 10 (c)) and the waveform of the first reflected light L1. Assuming that the wavelength of the disturbing light signal is λ, when the thickness of the reflection increasing unit 41 is equal to λ/8, the optical path difference of the second reflected light L2 compared with the first reflected light L1 is λ/8 × 2 ═ λ/4, the optical path difference of λ/4 will make the phase difference between the second reflected light L2 and the first reflected light L1 constant to be pi/2, the second reflected light L2 interferes with the first reflected light L1, so that the total energy R of the reflected light is increased, and the total energy R of the reflected light is shown in fig. 10 (d). According to the energy conservation theorem, the energy T ═ I-R of the transmitted light Lt is reduced, so that the energy of the interfering light signal passing through the reflection increasing device 40 is reduced, so that the light signal entering the imaging device 30 after actually passing through the reflection increasing device 40 is the light signal shown in fig. 8(b), wherein the light signal of 0 order is not attenuated by the reflection increasing unit 41, and the light signals of the remaining orders (± 1, ± 2, ± 3) are attenuated by the reflection increasing unit 41, so that the signal-to-noise ratio of the light signal for imaging is improved.

In summary, in the terminal 100 according to the embodiment of the present application, the optical signal received by the imaging device 30 and used for imaging passes through the display area 21 and the reflection increasing device 40 in sequence, the reflection increasing unit 41 is disposed to increase the interference optical signal in the optical signal diffracted by the display device 20, the energy reflected by the reflection increasing unit 41 reduces the energy of the interference optical signal passing through the reflection increasing unit 41, so as to reduce the influence of the interference optical signal on the imaging of the imaging device 30, and improve the imaging quality when the imaging device 30 is disposed below the display device 20.

Referring to fig. 11, in some embodiments, the reflection increasing unit 41 includes a plurality of reflection increasing films 411 stacked one on another. The interference light signal can be reflected by the reflection increasing films 411 for multiple times, and the energy of the interference light signal penetrating through the reflection increasing films 411 is weakened for multiple times, so that the imaging quality is further improved. In manufacturing the reflection increasing unit 41, the reflection increasing film 411 may be manufactured layer by layer, and the reflection increasing unit 41 is configured by multiple layers of the reflection increasing film 411.

Further, the thicknesses of the reflection increasing films 411 of the same reflection increasing unit 41 are different. As can be seen from the above principle analysis, the reflection increasing films 411 with different thicknesses (h) can be used to increase the reflection energy of the optical signal with the corresponding wavelength (λ), where the corresponding relationship between the thickness h and the wavelength λ is h ═ λ/8, and the interference optical signal may include optical signals with multiple wavelengths, and by providing the reflection increasing films 411 with different thicknesses, the interference optical signals with corresponding different wavelengths can be reduced. Specifically, the thickness of each reflection increasing film 411 may be [47.5, 95] nanometers, for example, the thickness may be 47.5 nanometers, 50 nanometers, 51 nanometers, 65 nanometers, 70 nanometers, 82 nanometers, 95 nanometers, and the like, which are values within any of the above ranges. Accordingly, with the reflection increasing film 411 having a thickness in the range of [47.5, 95] nm, the reflection energy of the disturbing optical signal having a corresponding wavelength in the range of [380, 760] nm can be increased. The interference light signals in the wavelength range [380, 760] nm are all visible light signals, so the reflection increasing film 411 in the thickness range can reduce the influence of the visible light signals in the interference light signals on the imaging quality, and improve the imaging quality of the visible light images.

Referring to fig. 12, in some embodiments, the thickness of the same increasing unit 41 increases gradually along the direction approaching the central axis Z. In practical use, according to the principle of diffraction of light, the positions of optical signals of the same order with different wavelengths may be different, specifically, an optical signal with a longer wavelength is closer to the 0 order and an optical signal with a shorter wavelength is further from the 0 order in the same order. The same reflection increasing unit 41 can be used for weakening the interference optical signals with the same level and different wavelengths, so that for the same reflection increasing unit 41, the thickness of the reflection increasing unit 41 is gradually increased along the direction of approaching the central axis Z along the periphery, the distribution characteristics of the same-level interference optical signals with different wavelengths can be adapted, and a better interference preventing effect is realized.

Referring to fig. 2 and 13, in some embodiments, the reflection increasing device 40 is disposed on the display device 20. The display device 20 and the adaptive reflection increasing device 40 are integrated, and the need of recalibration due to the change of the relative positions of the display device 20 and the reflection increasing device 40 is avoided. Specifically, in one example, as shown in fig. 13(a), the reflection increasing unit 41 and the display device 20 are respectively located on opposite sides of the substrate 42. In this case, the substrate 42 may be combined with the display device 20, for example, the substrate 42 is adhered to the display device 20 by glue, and the diffracted light signal passes through the substrate 42 and then passes through the reflection increasing unit 41. In another example, as shown in fig. 13(b), the substrate 42 and the display device 20 are respectively located on two opposite sides of the reflection increasing unit 41. In this case, the reflection increasing unit 41 may be combined with the display device 20, for example, the reflection increasing unit 41 is attached to the display device 20 by glue, and the diffracted light signal passes through the reflection increasing unit 41 and then passes through the substrate 42.

Referring to fig. 2 and 14, in some embodiments, the imaging device 30 includes a lens 31, and the reflection increasing device 40 is disposed on the lens 31. Specifically, in one example, as shown in fig. 14(a), the reflection increasing unit 41 and the lens 31 are respectively located on opposite sides of the base 42. The base 42 may be coupled to the lens 31, for example, the base 42 may be adhered to the lens 31 by glue or may be held against the lens 31 by interference fit. The diffracted light signal passes through the substrate 42 after passing through the reflection increasing unit 41. In another example, as shown in fig. 14(b), the substrate 42 and the lens 31 are respectively located on opposite sides of the reflection increasing unit 41. At this time, the reflection increasing unit 41 may be combined with the lens 31, for example, the reflection increasing unit 41 is attached to the lens 31 by glue, and the diffracted light signal passes through the substrate 42 and then passes through the reflection increasing unit 41.

Referring to fig. 2 and 15, in some embodiments, the reflection increasing unit 41 closest to the central axis Z defines a transmission area 421 on the substrate 42, and the transmission area 421 is used for the 0-order light beam of the optical signal passing through the display area 21 to pass through. Wherein, the 0-order light beam can be understood as the 0-order light signal, and the 0-order light beam is the target light signal for imaging, and a transmission area 421 is formed in the reflection increasing device 40 for the 0-order light beam to pass through, so as to avoid the 0-order light beam from being weakened by the reflection increasing unit 41, and improve the light input amount of the imaging device 30.

Further, referring to fig. 15, an anti-reflection device 60 is disposed on the transmission region 421, and the anti-reflection device 60 is used to enhance the energy of the optical signal transmitted through the anti-reflection device 60. The anti-reflection device 60 may be an anti-reflection film, and when the 0-level light beam passes through the anti-reflection device 60, the transmission light of the 0-level light beam is enhanced, and the reflection light is weakened, so as to enhance the energy of the 0-level light beam entering the imaging device 30 and improve 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. A terminal, comprising:

a display device including a display area;

an imaging device disposed in alignment with the display area; and

the image forming device is used for receiving optical signals which sequentially pass through the display area and the image increasing and reflecting device so as to form images; the reflection increasing device comprises a transparent substrate and a plurality of reflection increasing units, wherein the reflection increasing units are arranged on the substrate at intervals;

the light signals passing through the display area comprise target light signals and interference light signals, and the reflection increasing unit is used for increasing the energy reflected by the interference light signals reaching the reflection increasing unit;

the wavelength of the interference optical signal is lambda, and the thickness of the reflection increasing unit is lambda/8;

the interference optical signal is reflected by a first interface of the reflection increasing unit to form first reflected light, and the interference optical signal is reflected by a second interface of the reflection increasing unit to form second reflected light; the phase difference between the second reflected light and the first reflected light is constant pi/2, and the second reflected light interferes with the first reflected light, so that the reflected energy of the interference light signal is enhanced.

2. A terminal according to claim 1, wherein each of the reflection increasing units is annular, and a plurality of the reflection increasing units are concentric with the central axis and spaced from each other.

3. A terminal according to claim 1 or 2, wherein the reflection increasing unit comprises a plurality of reflection increasing films arranged one above the other.

4. A terminal according to claim 3, wherein the antireflection films of the same antireflection unit have different thicknesses.

5. A termination according to claim 3, wherein each said antireflection film has a thickness of [47.5, 95] nm.

6. A terminal according to claim 2, wherein the thickness of the same cell increases progressively in a direction from the periphery towards the central axis.

7. The terminal according to claim 2, wherein the reflection increasing means is provided on the display means;

the reflection increasing unit and the display device are respectively positioned on two sides of the base body, which are opposite to each other; or

The substrate and the display device are respectively positioned on two sides of the reflection increasing unit, which are back to back.

8. The terminal of claim 2, wherein the imaging device comprises a lens, and the reflection increasing device is disposed on the lens;

the reflection increasing unit and the lens are respectively positioned on two sides of the base body, which are opposite to each other; or

The substrate and the lens are respectively positioned on two sides of the reflection increasing unit, which are back to back.

9. A terminal as claimed in claim 2, wherein the reflection increasing element closest to the central axis encloses a transmissive area on the substrate for passing a 0-order beam of the optical signal passing through the display area.

10. A terminal as claimed in claim 9, wherein an anti-reflection means is provided on the transmission region for enhancing the energy of the optical signal transmitted through the anti-reflection means.