CN115273163A - Light modulation structure, fingerprint sensor and display device - Google Patents
Light modulation structure, fingerprint sensor and display device Download PDFInfo
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- CN115273163A CN115273163A CN202210715517.3A CN202210715517A CN115273163A CN 115273163 A CN115273163 A CN 115273163A CN 202210715517 A CN202210715517 A CN 202210715517A CN 115273163 A CN115273163 A CN 115273163A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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- G—PHYSICS
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- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
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Abstract
The embodiment of the application provides an optical modulation structure, a fingerprint sensor and a display device. The light modulation structure comprises a micro lens array, a first light modulation layer and a diaphragm layer. The micro lens array is used for receiving natural light and light reflected by fingerprints; the first light modulation layer is positioned on one side of the micro lens array and used for receiving light rays passing through the micro lens array and reflecting light rays with the wavelength within a first waveband range in the light rays, wherein the wavelength of the first waveband is not less than 700 nanometers and not more than 1000 nanometers; the diaphragm layer is arranged on one side, far away from the micro-lens array, of the first light modulation layer. The light modulation structure that this application embodiment provided can go out the infrared band light reflection that wavelength is 700 ~ 1000 nanometers through setting up first light modulation layer, can avoid light modulation structure and photosensitive sensor to place the below mesh of display panel and look the problem of reddening.
Description
Technical Field
The application relates to the technical field of display, in particular to an optical modulation structure, a fingerprint sensor and a display device.
Background
Due to the uniqueness of the fingerprint characteristics, the fingerprint identification is widely applied to scenes such as screen unlocking of a mobile phone, bank authentication and the like as a biological characteristic identification mode, and audiences are very wide. The conventional fingerprint sensor comprises an optical fingerprint sensor, a capacitive fingerprint sensor, an ultrasonic fingerprint sensor and the like, and the optical fingerprint sensor can be arranged below a screen, so that the optical fingerprint sensor has obvious advantages in low cost compared with other sensors.
In the optical fingerprint sensor, a collimating light path of a light modulation structure is a key device for fingerprint imaging, and optical fingerprint signals passing through a screen are clearly imaged on a photosensitive sensor in a collimating mode.
In an existing light modulation structure (also referred to as a collimating film) in an optical fingerprint sensor under a screen, light of natural light (such as sunlight) except red light and near-infrared light bands is basically filtered by a finger after passing through the finger, but the light intensity of the natural light is too large, so that an optical fingerprint signal is submerged in a strong light signal of the natural light which is not filtered by the finger and cannot be distinguished, and thus the light of the natural light which is not filtered by the finger is mixed in the optical fingerprint signal received by a photosensitive sensor, and the imaging definition of the photosensitive sensor is reduced.
Disclosure of Invention
This application provides a light modulation structure, fingerprint sensor and display device to the shortcoming of current mode for mixed the light of the natural light that is not by the finger filtering in the optical fingerprint signal that the photosensor received that solves prior art existence, lead to the photosensitive sensor imaging definition to descend.
In a first aspect, an embodiment of the present application provides a light modulation structure, including:
a micro lens array for receiving natural light and light reflected by a fingerprint;
the first light modulation layer is positioned on one side of the micro lens array and used for receiving the light rays passing through the micro lens array and reflecting the light rays with the wavelength within a first waveband range in the light rays, wherein the wavelength of the first waveband is not less than 700 nanometers and not more than 1000 nanometers;
and the diaphragm layer is positioned on one side of the first light modulation layer, which is far away from the micro lens array.
In one possible implementation manner, the method further includes:
and the second light modulation layer is positioned on one side of the diaphragm layer, which is far away from the first light modulation layer, and is used for absorbing light rays with the wavelength within a second waveband range in the light rays transmitted by the first light modulation layer, wherein the wavelength of the second waveband is not less than 650 nanometers and not more than 850 nanometers.
In one possible implementation, the orthographic projection of the first light modulation layer on the plane of the microlens array overlaps with the microlens array.
In one possible implementation, the first light modulation layer includes a first sub light modulation layer and a second sub light modulation layer;
the first sub light beam modulation layer and the second sub light beam modulation layer are alternately stacked, and the refractive indexes of the first sub light beam modulation layer and the second sub light beam modulation layer are different.
In one possible implementation, the refractive index of the first sub light modulation layer is greater than 1.4 and less than 1.5;
the refractive index of the second sub-light modulation layer is greater than 1.6 and less than 1.8;
the thickness of the first sub-light modulation layer is in direct proportion to the wavelength to be modulated by the first sub-light modulation layer and in inverse proportion to the refractive index of the first sub-light modulation layer;
the thickness of the second sub-light modulation layer is proportional to the wavelength that the second sub-light modulation layer needs to modulate and inversely proportional to the refractive index of the second sub-light modulation layer.
In one possible implementation, the thickness of the first light modulation layer is not less than 1 micrometer and not more than 10 micrometers.
In one possible implementation, an orthographic projection of the second light modulation layer on the plane of the microlens array overlaps with an orthographic projection of the first light modulation layer on the plane of the microlens array.
In one possible implementation, the thickness of the second light modulation layer is not less than 15 microns and not more than 25 microns.
In one possible implementation, the material of the second light modulation layer includes a photosensitive resin or an optical glue that absorbs light in the second wavelength band.
In one possible implementation manner, the diaphragm layer comprises a plurality of light-shielding pieces and light-transmitting holes positioned between the adjacent light-shielding pieces;
the light holes are in one-to-one correspondence with the micro lenses in the micro lens array, the micro lens array is in the orthographic projection of the diaphragm layer, and the projection area of the micro lenses is larger than the area of the light holes.
In one possible implementation manner, the method further includes: a filling layer;
the filling layer is located on one side, away from the first light modulation layer, of the micro lens array and used for enabling the surface, away from the first light modulation layer, of the micro lens array to be flat.
In one possible implementation, the index of refraction of the fill layer is less than the index of refraction of the microlenses in the microlens array.
In a second aspect, embodiments of the present application provide a fingerprint sensor, including the light modulation structure and the photosensitive sensor as in the first aspect;
the photosensitive sensor is positioned on one side of the light modulation structure and used for receiving the light output by the light modulation structure.
In a third aspect, an embodiment of the present application provides a display device, including: a display panel and a fingerprint sensor as in the second aspect;
the fingerprint sensor is located on one side of the display panel and used for receiving light output by the display panel.
In one possible implementation, when the light modulating structure includes a filling layer, the display device further includes a conforming layer;
the display panel is attached to the filling layer through the attaching layer.
The beneficial technical effects brought by the technical scheme provided by the embodiment of the application comprise:
the light modulation structure provided by the embodiment of the application can reflect the infrared band light with the wavelength of 700-1000 nanometers by arranging the first light modulation layer, namely, the infrared band light with the wavelength of 700-1000 nanometers, which is not filtered by a finger, is prevented from being output to the photosensitive sensor, so that the intensity of the natural light emitted into the sensor is greatly reduced, the light intensity of the natural light received by the photosensitive sensor and not filtered by the finger can be reduced, further, the intensity of the light reflected by the fingerprint received by the photosensitive sensor cannot be greatly influenced, and the imaging definition of the photosensitive sensor is improved; in addition, because the light reflected by the 700-1000 nm is near infrared and invisible to naked eyes, the problem that the light modulation structure and the photosensitive sensor are placed below the display panel to be visible and red can be avoided.
Additional aspects and advantages 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 the present application.
Drawings
The foregoing 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 fingerprint sensor according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a first light modulation layer of a light modulation structure according to an embodiment of the present application;
fig. 3 is a schematic view of an interception wavelength band of a first light modulation layer of a light modulation structure according to an embodiment of the present application;
FIG. 4 is a schematic structural diagram of another fingerprint sensor provided in an embodiment of the present application;
fig. 5 is a schematic structural diagram of a display device according to an embodiment of the present disclosure.
Reference numerals:
10-a light modulation structure, 11-a filling layer, 12-a microlens array, 13-a first light modulation layer, 14-a diaphragm layer, 15-a second light modulation layer, 131-a first sub-light modulation layer, 132-a second sub-light modulation layer;
20-a light sensitive sensor;
30-a display panel;
40-a laminating layer.
Detailed Description
Reference will now be made in detail to the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts or parts having the same or similar functions throughout. In addition, if a detailed description of the known art is not necessary for illustrating the features of the present application, it is omitted. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
The inventor of the application researches and discovers that the light modulation structure (also called as a collimating film) in the existing optical fingerprint sensor under the screen comprises a micro-lens array, a transparent layer and a diaphragm layer, the micro-lens array is arranged close to a display panel, the diaphragm layer is arranged far away from the display panel, namely, after a finger of a user presses the display panel, light emitted by the display panel is reflected by a fingerprint and then enters the micro-lens array, and then the light is emitted by the diaphragm layer and enters the photosensitive sensor. The transparent layer may include a PET (polyethylene terephthalate) film.
However, light entering the photosensor includes not only light reflected by a fingerprint but also natural light not filtered by a finger (the wavelength of the natural light not filtered by the finger is in an infrared band), the entering of the natural light affects the intensity of light reflected by the fingerprint, and the natural light not filtered by the finger is mixed in a signal received by the photosensor, so that the imaging definition of the photosensor is reduced.
In order to solve the above problems, the existing solutions include:
1. by integrating a reflective wavelength modulation layer below the diaphragm layer, red light and near infrared light (650 nm to 1000 nm) are filtered by the reflective wavelength modulation layer. Because the existing scheme is that transparent colloids such as OCA (optical clear adhesive) are used on two surfaces of a reflection-type wavelength modulation layer to bond a collimating film and a photosensitive sensor, the distance from an image space focus of the collimating film to the photosensitive sensor is increased, the distance from the image space focus to the photosensitive sensor is the total thickness of the transparent colloids (OCA on two surfaces) and the reflection-type wavelength modulation layer, and the thickness reaches 60um (micrometers), aliasing easily occurs in imaging of adjacent microlenses, signals of each other are weakened, and imaging cannot achieve an ideal effect.
2. By integrating the reflective wavelength modulation layer in the collimating optical path (i.e., the reflective wavelength modulation layer is integrated in the transparent layer), but because the reflective wavelength modulation layer has a reflective wavelength of 650nm to 1000nm (nanometers), when the reflective wavelength modulation layer is placed between the microlens array and the aperture layer, the reflected light in the visible red light band (650 nm to 700 nm) cannot be absorbed and blocked by the aperture layer, and a large-angle visual redness phenomenon exists below the screen, so that chromatic aberration is formed to affect the look and experience.
Although the technical problem that imaging definition of the photosensitive sensor is reduced due to the fact that light rays of natural light which are not filtered by fingers are mixed in optical fingerprint signals received by the photosensitive sensor is solved, a new technical problem is introduced, specifically, the problem that adjacent micro-lenses are easy to aliasing in imaging is caused by the scheme 1, and the phenomenon that a large-angle visual red color is formed below a screen is caused by the scheme 2.
Therefore, the technical problem that the imaging definition of the photosensitive sensor is reduced due to the fact that light rays of natural light which are not filtered by a finger are mixed in the optical fingerprint signal received by the photosensitive sensor is solved, and further research and improvement are needed.
The application provides a light modulation structure, fingerprint sensor and display device, aims at solving prior art as above technical problem.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments.
The present embodiment provides a light modulation structure 10, as shown in fig. 1, the light modulation structure 10 includes a microlens array 12, a first light modulation layer 13, and a diaphragm layer 14. The first light modulation layer 13 is a reflection-type wavelength modulation layer, and the reflection band of the first light modulation layer 13 is set to be not less than 700nm and not more than 1000nm, that is, the reflection band of the first light modulation layer 13 is set to be 700nm to 1000nm.
A microlens array 12 for receiving natural light and light reflected by a fingerprint;
a first light modulation layer 13, located at one side of the microlens array 12, for receiving the light passing through the microlens array 12 and reflecting the light with a wavelength in a first band range in the light, where the wavelength of the first band range is not less than 700nm and not more than 1000 nm;
and an aperture layer 14 positioned on a side of the first light modulation layer 13 away from the microlens array 12.
The near-infrared light having a wavelength of 700nm to 1000nm (nanometers) is invisible to the naked eye.
It should be noted that, the optical modulation structure 10 is located below the display panel, the photosensitive sensor is located below the optical modulation structure 10, in the fingerprint identification process, after a finger presses or contacts the display panel, the finger reflects light emitted by the display panel, and most of natural light can be filtered by the finger, the natural light received by the microlens array 12 is light that is not filtered by the finger, and the wavelength of the part of light is generally 650nm to 1000nm.
It should be noted that the first light modulation layer 13 is used for receiving light after passing through the microlens array 12, and the first light modulation layer 13 is used for receiving light reflected by the fingerprint and receiving light that is not filtered by the finger.
In addition, the specific setting of the diaphragm layer 14 in the embodiment of the present application is similar to that in the prior art, and is not described here any more, and the diaphragm layer 14 can play a role in limiting light beams, and further can play a role in collimating light rays.
The light modulation structure provided by the embodiment of the application can reflect the infrared band light with the wavelength of 700-1000 nm by arranging the first light modulation layer 13, namely, the infrared band light with the wavelength of 700-1000 nm, which is not filtered by a finger, is prevented from being output to the photosensitive sensor, so that the intensity of the natural light emitted into the sensor is greatly weakened, the light intensity of the natural light received by the photosensitive sensor and not filtered by the finger can be reduced, further, the intensity of the light reflected by the fingerprint received by the photosensitive sensor cannot be greatly influenced, and the imaging definition of the photosensitive sensor is improved; in addition, because the light reflected by the 700-1000 nm is near infrared light and invisible to naked eyes, the problem that the light modulation structure and the photosensitive sensor are arranged below the display panel to see red can be avoided.
In some embodiments, as shown in FIG. 1, light modulating structure 10 further comprises a second light modulating layer 15. The second light modulation layer 15 is an absorption-type wavelength modulation layer, and an absorption band of the second light modulation layer 15 is set to be not less than 650nm and not more than 850nm, that is, the absorption band of the second light modulation layer 15 is set to be 650nm to 850nm; the second light modulation layer 15 is located on a side of the stop layer 14 away from the first light modulation layer 13, and is configured to absorb light, of the light transmitted through the first light modulation layer 13, having a wavelength within a second waveband, where the wavelength of the second waveband is not less than 650 nanometers and not more than 850 nanometers.
The red light having a wavelength of 650nm to 700nm (nanometers) is visible to the naked eye.
The light modulation structure provided by the embodiment of the application reflects the infrared band light with the wavelength of 700nm to 1000nm through the first light modulation layer 13, and because the light reflected by 700nm to 1000nm is near infrared light and invisible to naked eyes, the problem that the light modulation structure 10 and the photosensitive sensor 20 are placed below the display panel to visually emit red light can be avoided. The red light with the wavelength of 650-850 nm and the infrared band light are absorbed and blocked by the second light modulation layer 15, namely, the light with the wavelength of 650-700 nm (nm) is allowed to pass through the first light modulation layer 13, then the red light with the wavelength of 650-700 nm is absorbed by the second light modulation layer 15, the light of natural light which is received by the photosensitive sensor and is not filtered by fingers can be further reduced, the intercepting effect of the red light and the infrared band is enhanced, and the imaging definition of the photosensitive sensor is further improved.
In some embodiments, the orthographic projection of the first light modulation layer 13 on the plane of the microlens array 12 overlaps with the microlens array 12; when specifically setting up promptly, what the area of first light modulation layer 13 can set up is as big as microlens array 12's area, and reflection wavelength that like this can the at utmost is the light of first band within range, and then the better reduction is not influenced by the natural light of finger filtering to fingerprint formation of image.
In some embodiments, as shown in fig. 2, the first light modulation layer 13 includes a first sub light modulation layer 131 and a second sub light modulation layer 132; the first and second sub light modulation layers 131 and 132 are alternately stacked, and the refractive indices of the first and second sub light modulation layers 131 and 132 are different.
In some embodiments, the refractive index of the first sub light modulation layer 131 is greater than 1.4 and less than 1.5; the refractive index of the second sub light modulation layer 132 is greater than 1.6 and less than 1.8; the thickness of the first sub light beam modulation layer 131 is proportional to the wavelength that the first sub light beam modulation layer 131 needs to modulate, and inversely proportional to the refractive index of the first sub light beam modulation layer 131; the thickness of the second light sub-modulation layer 132 is proportional to the wavelength that the second light sub-modulation layer 132 needs to modulate, and inversely proportional to the refractive index of the second light sub-modulation layer 132.
The embodiment of the present application achieves the effect of reflecting light having a wavelength within the first wavelength range by selecting the refractive index of the first sub light beam modulation layer 131, the refractive index of the second sub light beam modulation layer 132, the thickness of the first sub light beam modulation layer 131, the thickness of the second sub light beam modulation layer 132, and the thickness of the first light beam modulation layer 13.
Specifically, referring to fig. 2, in fig. 2, n1 denotes a refractive index of the first sub light ray modulation layer 131, and n2 denotes a refractive index of the second sub light ray modulation layer 132. h is a total of1、h2、h3…hkEach representing the thickness of a single film layer in the first light modulation layer 13. Lambda [ alpha ]1、λ2、λ3…λkRespectively, representing the wavelengths to be modulated for the individual layers in the first light modulation layer 13.
The modulation principle of the first sub light modulation layer 131 (i.e., the reflective wavelength modulation layer) is described below. With continued reference to fig. 2, the modulation utilizes the principle of light interference: when the optical thickness τ of the film is equal to about half of the wavelength λ to be reflected, the reflection and transmission phenomena for the wavelength are modulated at the interface of the film, and the reflection is enhanced by weakening the transmission of the wavelength. Namely: the optical path difference formula tau = nh = lambda/2 + k lambda is satisfied, and the method can be obtained
Lambda is the wavelength to be modulated, n is the refractive index of the film material, h is the thickness of the film material, and k is the number of layers of the film material.
In order to achieve a certain specified wavelength range (lambda)1～λk) The wavelength modulation of (2) requires the superposition of several single wavelength modulation layers in a continuous wavelength range to achieve the effect of continuous wavelength modulation, as shown in fig. 3. The thickness h of different layers can be adjusted by adjusting the refractive indexes of a plurality of materials with different refractive indexeskThe wavelength band to be modulated is obtained, generally, 1.4 < n1 < 1.5,1.6 < n2 < 1.8, and the thickness of the first light modulation layer 13 is in the thickness range of 1um to 10 um. The composite film material is formed by the processes of alternate deposition, melting, stretching or laminating and the like of film materials (such as silicon oxide/titanium oxide laminated layers and the like) with different thicknesses and different refractive indexes, and the composite film meeting the established wavelength modulation is obtained.
For example, in the case of a liquid,
wherein (i is more than or equal to 1 and less than or equal to k, and j is 1 or 2).
As shown in the above formula1、λ2……λkThe values 700, 701, 8230, 8230and 1000 can be respectively selected to obtain the thickness h of a single film layer in the first light modulation layer 131、h2……hk。
The first sub-light modulation layer 131 can adjust the reflection band to 700-1000 nm according to the above modulation principle.
In some embodiments, the thickness of the first light modulation layer 13 is not less than 1 micron, and not more than 10 microns; specifically, too thick or too thin a thickness of the first light modulation layer 13 does not function to reflect light having a wavelength in the first wavelength band among the light.
In some embodiments, the orthographic projection of the second light modulation layer 15 on the plane of the microlens array 12 overlaps with the orthographic projection of the first light modulation layer 13 on the plane of the microlens array 12; the red light and the infrared light which are not reflected by the first light modulation layer 13 can be absorbed to the maximum extent by the arrangement mode, and the natural light which enters the photosensitive sensor and is not filtered by the finger is reduced to the maximum extent.
In some embodiments, the thickness of the second light modulation layer 15 is not less than 15 microns and not greater than 25 microns. The thickness of the second light modulation layer 15 is, for example, 15 micrometers. Therefore, red light and infrared light which are not reflected by the first light modulation layer 13 can be absorbed to the maximum extent, and adjacent micro-lens imaging aliasing is not easy to occur, so that the quality of an image is further enhanced, and the user experience is improved.
In some embodiments, the material of the second light modulation layer 15 includes a photosensitive resin or an optical paste OCA that absorbs light in the second wavelength band.
Specifically, the photosensitive resin has high blue-green band transmittance and extremely low red and infrared band transmittance, for example, the photosensitive resin may be a blue-green photosensitive acrylic resin or the like.
This application embodiment has replaced the stratum lucidum through embedding current collimation film with first light modulation layer 13 (reflection-type wavelength modulation layer promptly), and has added second light modulation layer 15 (absorption type wavelength modulation layer) below the collimation film, both can reach and absorb the ruddiness wave band and avoided the red problem that can visualize of wide-angle, also greatly shortened the distance of light modulation structure image side focus to photosensitive sensor, promote the signal that photosensitive sensor received, the contrast and the resolution ratio of image have further been promoted.
In some embodiments, as shown in fig. 1, the stop layer 14 includes a plurality of light-blocking members, and light-transmitting holes between adjacent light-blocking members; the light holes are arranged in one-to-one correspondence with the microlenses in the microlens array 12, and in the orthographic projection of the microlens array 12 on the diaphragm layer 14, the projection area of the microlenses is larger than the area of the light holes.
In some embodiments, as shown in FIG. 4, the light modulating structure 10 further comprises a fill layer 11; the filling layer 11 is located on one side of the microlens array 12 away from the first light modulation layer 13, and is used for making the surface of the microlens array 12 away from the first light modulation layer 13 flat, so as to be convenient for being attached to a display panel.
In some embodiments, the index of refraction of the fill layer 11 is less than the index of refraction of the microlenses in the microlens array 12. The fill layer 11 also adjusts the optical path to better match the microlens array.
Based on the same inventive concept, as shown in fig. 1 and 4, the present application provides a fingerprint sensor, including the light modulation structure 10 and the photosensitive sensor 20 provided in any of the above embodiments; the photo sensor 20 is located at one side of the light modulation structure 10 for receiving light outputted through the light modulation structure 10.
The fingerprint sensor provided by the embodiment of the present application has the same inventive concept and the same advantages as the previous embodiments, and the contents not shown in detail in the fingerprint sensor can refer to the previous embodiments and are not described herein again. In addition, transparent colloid such as a reflection-type wavelength modulation layer and an OCA (optical clear adhesive) does not need to be added below the diaphragm layer 14, the distance from the image space focus of the optical modulation structure 10 to the photosensitive sensor is reduced, and imaging aliasing of adjacent microlenses is not easy to occur, so that the quality of an image is enhanced, and user experience is improved.
Based on the same inventive concept, as shown in fig. 5, an embodiment of the present application provides a display device, including: a display panel 30 and a fingerprint sensor as provided in any of the embodiments described above.
The fingerprint sensor is positioned at one side of the display panel 30 to receive light output through the display panel 30.
The display device provided by the embodiment of the present application has the same inventive concept and the same advantageous effects as the previous embodiments, and the content not shown in detail in the display device can refer to the previous embodiments, and is not described herein again.
In some embodiments, as shown in fig. 5, when the light modulating structure 10 includes a filler layer 11, the display device further includes a conforming layer 40; the display panel 30 is attached to the filling layer 11 through the attachment layer 40.
Optionally, the adhesive layer 40 may employ an optical adhesive OCA to increase the adhesive force of the surface.
In some embodiments, when the light modulating structure 10 does not include the filling layer 11, there is a certain spacing between the light modulating structure 10 and the display panel 30 because the upper surface of the light modulating structure 10 is a microlens structure.
Alternatively, the display panel 30 may include an OLED display panel.
The display device can be applied to any product or component with a display function, such as a smart phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
Optionally, the fingerprint sensor may be disposed on a middle frame of the smartphone terminal.
By applying the embodiment of the application, at least the following beneficial effects can be realized:
first, the light modulation structure that this application embodiment provided can go out the infrared band light reflection that wavelength is 700 ~ 1000 nanometers through setting up first light modulation layer 13, has blockked promptly that the wavelength that is not filtered by the finger is that the infrared band light of 700 ~ 1000 nanometers exports photosensor, because the light of 700 ~ 1000 nanometers reflection is near infrared, and unaided eye is not visible, can avoid light modulation structure 10 and photosensor 20 to place the problem of seeing reddening below display panel 30.
Secondly, transparent colloids such as a reflection-type wavelength modulation layer and an OCA (optical clear adhesive) are not required to be added below the diaphragm layer 14, the distance from an image space focus of the light modulation structure 10 to the photosensitive sensor is reduced, adjacent microlens imaging aliasing is not easy to occur, and therefore the quality of images is enhanced, and user experience is improved.
Those of skill in the art will appreciate that the various operations, methods, steps in the processes, acts, or solutions discussed in this application can be interchanged, modified, combined, or eliminated. Further, various operations, methods, steps, measures, schemes in the various processes, methods, procedures that have been discussed in this application may be alternated, modified, rearranged, decomposed, combined, or eliminated. Further, steps, measures, schemes in the prior art having various operations, methods, procedures disclosed in the present application may also be alternated, modified, rearranged, decomposed, combined, or deleted.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present application.
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 to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Claims (15)
1. A light modulating structure, comprising:
a micro lens array for receiving natural light and light reflected by a fingerprint;
the first light modulation layer is positioned on one side of the micro lens array and used for receiving the light rays passing through the micro lens array and reflecting the light rays with the wavelength within a first waveband range in the light rays, wherein the wavelength of the first waveband is not less than 700 nanometers and not more than 1000 nanometers;
and the diaphragm layer is positioned on one side of the first light modulation layer, which is far away from the micro lens array.
2. The light modulating structure of claim 1, further comprising:
and the second light modulation layer is positioned on one side of the diaphragm layer, which is far away from the first light modulation layer, and is used for absorbing light rays with the wavelength within a second waveband range in the light rays transmitted through the first light modulation layer, wherein the wavelength of the second waveband is not less than 650 nanometers and not more than 850 nanometers.
3. A light modulating structure as claimed in claim 1, wherein an orthographic projection of the first light modulating layer on the plane of the array of microlenses overlaps the array of microlenses.
4. The light modulating structure of claim 1, wherein the first light modulation layer comprises a first sub-light modulation layer and a second sub-light modulation layer;
the first and second sub light modulation layers are alternately stacked, and refractive indices of the first and second sub light modulation layers are different.
5. The light modulating structure of claim 4,
the refractive index of the first sub light modulation layer is greater than 1.4 and less than 1.5;
the refractive index of the second sub light modulation layer is greater than 1.6 and less than 1.8;
the thickness of the first sub light modulation layer is in direct proportion to the wavelength to be modulated of the first sub light modulation layer and in inverse proportion to the refractive index of the first sub light modulation layer;
the thickness of the second sub light modulation layer is proportional to a wavelength to be modulated by the second sub light modulation layer and inversely proportional to a refractive index of the second sub light modulation layer.
6. The light modulating structure of claim 1,
the thickness of the first light modulation layer is not less than 1 micrometer and not more than 10 micrometers.
7. A light modulating structure as claimed in claim 2 wherein an orthographic projection of the second light modulating layer on the plane of the microlens array overlaps with an orthographic projection of the first light modulating layer on the plane of the microlens array.
8. The light modulating structure of claim 7,
the thickness of the second light modulation layer is not less than 15 micrometers and not more than 25 micrometers.
9. The light modulating structure of claim 7,
the material of the second light modulation layer comprises a photosensitive resin or an optical glue which absorbs light in the second waveband range.
10. The light modulating structure of claim 1, wherein the stop layer comprises a plurality of light blocking members and light transmissive apertures between adjacent light blocking members;
the light holes are in one-to-one correspondence with the micro lenses in the micro lens array, the micro lens array is arranged in the orthographic projection of the diaphragm layer, and the projection area of the micro lenses is larger than the area of the light holes.
11. A light modulating structure as claimed in any one of claims 1 to 10 further comprising: a filling layer;
the filling layer is located on one side of the micro-lens array far away from the first light modulation layer and is used for enabling the surface of the micro-lens array far away from the first light modulation layer to be flat.
12. The light modulating structure of claim 11, wherein the filler layer has a refractive index less than a refractive index of a microlens in the microlens array.
13. A fingerprint sensor comprising a light modulating structure according to any of claims 1 to 12 and a light sensitive sensor;
the photosensitive sensor is positioned on one side of the light modulation structure and used for receiving light rays output by the light modulation structure.
14. A display device, comprising: a display panel and the fingerprint sensor of claim 13;
the fingerprint sensor is located on one side of the display panel and used for receiving light rays output by the display panel.
15. The display device of claim 14, wherein when the light modulating structure comprises a filler layer, the display device further comprises a conforming layer;
the display panel is attached to the filling layer through the attaching layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210715517.3A CN115273163A (en) | 2022-06-22 | 2022-06-22 | Light modulation structure, fingerprint sensor and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210715517.3A CN115273163A (en) | 2022-06-22 | 2022-06-22 | Light modulation structure, fingerprint sensor and display device |
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| CN115273163A true CN115273163A (en) | 2022-11-01 |
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| CN202210715517.3A Pending CN115273163A (en) | 2022-06-22 | 2022-06-22 | Light modulation structure, fingerprint sensor and display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117351525A (en) * | 2023-12-05 | 2024-01-05 | 杭州海康威视数字技术股份有限公司 | Image recognition system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117351525A (en) * | 2023-12-05 | 2024-01-05 | 杭州海康威视数字技术股份有限公司 | Image recognition system |
| CN117351525B (en) * | 2023-12-05 | 2024-03-08 | 杭州海康威视数字技术股份有限公司 | Image recognition system |
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