CN111950322A - Image acquisition device - Google Patents
Image acquisition device Download PDFInfo
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- CN111950322A CN111950322A CN201910402190.2A CN201910402190A CN111950322A CN 111950322 A CN111950322 A CN 111950322A CN 201910402190 A CN201910402190 A CN 201910402190A CN 111950322 A CN111950322 A CN 111950322A
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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
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/145—Illumination specially adapted for pattern recognition, e.g. using gratings
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/147—Details of sensors, e.g. sensor lenses
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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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- General Physics & Mathematics (AREA)
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- Human Computer Interaction (AREA)
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- General Health & Medical Sciences (AREA)
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- Optics & Photonics (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
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Abstract
An image acquisition apparatus comprising: the light-transmitting cover plate is provided with a first face and a second face which are opposite to each other in the thickness direction, and the first face of the light-transmitting cover plate is suitable for being in contact with an object to be collected; a light source member having a first surface and a second surface opposite to each other in a thickness direction, the first surface of the light source member being disposed toward the second surface of the light-transmitting cover plate; a sensor member provided on a second surface of the light source member; further comprising: and the scattering layer is coated on the second surface of the light source component and is suitable for scattering incident light. The scheme provided by the invention can effectively prevent secondary total reflection and ensure that the signal light can be successfully incident to the sensor component.
Description
Technical Field
The invention relates to the technical field of image acquisition, in particular to an image acquisition device.
Background
With the development of information technology, biometric identification technology plays an increasingly important role in ensuring information security and the like, wherein fingerprint identification has become one of the key technical means for identity identification and equipment unlocking widely applied in the field of mobile internet.
Under the trend that the screen of the intelligent device accounts for more and more, the traditional capacitive fingerprint identification technology cannot meet the requirements, and the ultrasonic fingerprint identification technology has the problems of technical maturity, cost and the like, so that the optical fingerprint identification technology is expected to become a mainstream technical scheme of fingerprint identification.
The existing optical fingerprint identification scheme is based on the imaging principle of a geometric optical lens, and the used fingerprint module comprises a micro-lens array, an optical spatial filter and other elements, so that the defects of complex structure, thick module, small sensing range, high cost and the like exist.
Compared with the existing optical fingerprint identification scheme, the non-lens optical screen lower fingerprint identification technology realized by the total reflection imaging principle of physical optics has the advantages of simple structure, thin module, large sensing range, low cost and the like.
However, in the optical screen lower fingerprint scheme based on the optical total reflection principle, an air gap cannot be formed between the photoelectric sensor and the illumination light source, otherwise, signal light carrying fingerprint information undergoes secondary total reflection and cannot reach the photoelectric sensor.
Disclosure of Invention
The invention solves the technical problem of how to prevent secondary total reflection and ensure that signal light can be incident to a sensor component.
In order to solve the above technical problem, an embodiment of the present invention provides an image capturing device, including: the light-transmitting cover plate is provided with a first face and a second face which are opposite to each other in the thickness direction, and the first face of the light-transmitting cover plate is suitable for being in contact with an object to be collected; a light source member having a first surface and a second surface opposite to each other in a thickness direction, the first surface of the light source member being disposed toward the second surface of the light-transmitting cover plate; a sensor member provided on a second surface of the light source member; further comprising: and the scattering layer is coated on the second surface of the light source component and is suitable for scattering incident light.
Optionally, the scattering layer is made of optical cement, and scattering particles are filled in the optical cement.
Optionally, the scattering particles are selected from: air bubbles, nano-materials.
Optionally, the diameter of the scattering particles is smaller than one-fifteenth of the wavelength of the incident light.
Optionally, the larger the filling density of the scattering particles in the optical cement is, the stronger the scattering of the incident light is.
Optionally, the thickness of the scattering layer is less than 500 microns.
Optionally, the light source component is a display panel.
Optionally, the display panel is selected from: liquid crystal display screen, active array organic light emitting diode display screen and little light emitting diode display screen.
Optionally, the sensor component is attached to a side of the scattering layer away from the light source component.
Optionally, an air gap is provided between the sensor component and a side of the scattering layer away from the light source component.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
an embodiment of the present invention provides an image capturing apparatus, including: the light-transmitting cover plate is provided with a first face and a second face which are opposite to each other in the thickness direction, and the first face of the light-transmitting cover plate is suitable for being in contact with an object to be collected; a light source member having a first surface and a second surface opposite to each other in a thickness direction, the first surface of the light source member being disposed toward the second surface of the light-transmitting cover plate; a sensor member provided on a second surface of the light source member; further comprising: and the scattering layer is coated on the second surface of the light source component and is suitable for scattering incident light. Compared with the existing image acquisition device, the image acquisition device provided by the embodiment of the invention can effectively prevent secondary total reflection, and ensure that signal light can be successfully incident to the sensor component. In particular, the design of the scattering layer can effectively reduce the probability of total reflection of incident light at the second surface of the light source component, thereby making it possible to prevent secondary total reflection.
Drawings
Fig. 1 is a schematic diagram of an image capturing device according to an embodiment of the present invention.
Detailed Description
As background art shows, the existing optical underscreen fingerprint identification device has many defects, and incident light (also called signal light) carrying fingerprint information is totally reflected twice in the device and cannot successfully reach the photoelectric sensor, which affects the fingerprint imaging quality.
Specifically, in the conventional optical underscreen fingerprint identification device based on the total reflection principle, an optical cement with a uniform refractive index is filled between the light source component and the sensor component to ensure that the incident light does not reflect when reaching the light source component.
However, in the manufacturing process, the process is limited, the sensor having a large area is difficult to be attached, and the optical paste may not completely fill all the gaps between the light source part and the sensor part. For example, an air bubble is formed between the light source component and the sensor component, and incident light is totally reflected at the position of the air bubble, so that the part of the incident light cannot successfully reach the sensor component, and the finally formed fingerprint image has the problem of partial image missing.
In order to solve the above technical problem, an embodiment of the present invention provides an image capturing device, including: the light-transmitting cover plate is provided with a first face and a second face which are opposite to each other in the thickness direction, and the first face of the light-transmitting cover plate is suitable for being in contact with an object to be collected; a light source member having a first surface and a second surface opposite to each other in a thickness direction, the first surface of the light source member being disposed toward the second surface of the light-transmitting cover plate; a sensor member provided on a second surface of the light source member; further comprising: and the scattering layer is coated on the second surface of the light source component and is suitable for scattering incident light.
By adopting the scheme of the embodiment of the invention, the secondary total reflection can be effectively prevented, and the signal light can be ensured to be successfully incident to the sensor component. Specifically, the design of the scattering layer can effectively reduce the probability of total reflection of incident light on the second surface of the light source component, and the probability of formation of air bubbles is reduced, so that the prevention of secondary total reflection becomes possible.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a schematic diagram of an image capturing device according to an embodiment of the present invention. The image capturing device 100 may be an optical underscreen image capturing device, such as an optical underscreen fingerprint capturing device based on the optical total reflection principle.
The image capturing device 100 may be adapted to capture an image of an object to be captured, which may be a finger, and which may be a fingerprint image.
Specifically, referring to fig. 1, the image capturing apparatus 100 may include: a light-transmissive cover plate 110, said light-transmissive cover plate 110 having opposite first and second faces 110a, 110b in a thickness direction (as shown in the z-direction), said first face 110a of said light-transmissive cover plate 110 being adapted to be in contact with an object to be acquired; a light source section 120, the light source section 120 having a first surface 120a and a second surface 120b opposite to each other in a thickness direction (a z direction as illustrated), the first surface 120a of the light source section 120 being disposed toward the second surface 110b of the light-transmissive cover 110; and a sensor part 130, wherein the sensor part 130 is disposed on the second surface 120b of the light source part 120.
More specifically, the image capturing apparatus 100 may further include: and a diffusion layer 140 coated on the second surface 120b of the light source part 120, wherein the diffusion layer 140 is adapted to diffuse incident light.
In one embodiment, the light source part 120 may be a display panel.
For example, the display panel may be selected from: liquid crystal display screen, active array organic light emitting diode display screen and little light emitting diode display screen.
In one embodiment, the light-transmissive cover plate 110 may be made of a glass material.
In one embodiment, the sensor component 130 may be a photosensor. The transparent cover 110 may be imaged based on the principle of total reflection of physical optics, and an image formed by total reflection of the transparent cover 110 may be captured by the photosensor.
When the image capturing device 100 is applied to fingerprint recognition under an optical screen, the first surface 110a of the transparent cover 110 may be used for contacting a fingerprint, the second surface 110b of the transparent cover 110 may be provided with the light source component 120, and the light source component 120 may be adapted to emit light signals in different directions toward the first surface 110a of the transparent cover 110, where the light signals are totally reflected at the first surface 110a of the transparent cover 110 to form totally reflected light in different directions, and the totally reflected light enters the sensor component 130 through the transparent cover 110 and the light source component 120 to be received. Since the intensity of the totally reflected light is modulated by the fingerprint profile, an image of the fingerprint can be obtained by collecting the totally reflected light emitted from the second face 120b of the light source section 120.
For example, referring to fig. 1, when a finger is pressed to the first face 110a of the light-transmitting cover plate 110, one light emitted from the light-emitting point O is totally reflected at a point a according to the principle of total reflection, and the totally reflected light (hereinafter, referred to as incident light) is incident to a point C of the light source part 120.
In order to prevent the incident light from being totally reflected twice at the point C, the image capturing device 100 of the present embodiment is coated with the scattering layer 140 on the second surface 120b of the light source component 120, so that the incident light is scattered instead of being totally reflected at the point C. Since the propagation direction of the scattered light is changed, the total reflection condition of the incident light at the point C is destroyed, and thus the incident light can smoothly reach the vicinity of the point B on the sensor part 130 and be successfully received by the sensor part 130.
In one embodiment, the material of the scattering layer 140 may be optical cement filled with scattering particles. Further, the scattering particles may be uniformly filled in the optical cement to ensure that the incident light irradiated to any point of the light source component 120 is scattered when entering the scattering layer 140.
Preferably, the scattering particles may be selected from: air bubbles, nano-materials.
Unlike the air bubbles generated by the bonding process in the prior art, the air bubbles filled as the scattering particles in the present embodiment can be understood as air particles, and the diameter of the air particles is small enough to change the physical properties, so that the incident light is not reflected when being irradiated to the air particles.
For example, the nanomaterial may include nanoparticles of zinc oxide (ZnO), zirconium oxide (ZrO), chromium oxide (CrO), and the like.
The solution of the present embodiment ensures that the incident light is scattered in the scattering layer 140 instead of being totally reflected by uniformly filling the scattering layer 140 with low refractive index (e.g., the air bubbles) or high refractive index (e.g., the oxide nanoparticles) particles, so that the refractive index of the scattering layer 140 is not uniformly distributed and is different from the refractive index of the light source component 120. In one embodiment, the diameter of the scattering particles may be smaller than one-fifteenth of the wavelength of the incident light, so that the incident light is rayleigh scattered, which is beneficial to ensure the transmittance of the light. For example, when the incident light is green light, the diameter of the scattering particles may be within 35 nanometers.
Further, when the incident light includes a plurality of wavelengths, the diameter of the scattering particle may be determined by the minimum wavelength.
Alternatively, the diameter of the scattering particles may be determined from the average wavelength.
In one embodiment, the greater the packing density of the scattering particles within the optical glue, the greater the scattering of the incident light.
In practical applications, the packing density and diameter of the scattering particles are suitable for ensuring that the incident light is scattered and at the same time is not too dense to block the transmission of the incident light.
In one embodiment, the thickness of the scattering layer 140 in the z-direction may be less than 500 microns to facilitate device miniaturization design while ensuring scattering effect.
In one embodiment, the sensor part 130 and the side of the scattering layer 140 away from the light source part 120 may be attached. That is, there may be no air gap between the sensor part 130 and the scattering layer 140 shown in fig. 1 to further reduce the possibility of the incident light from undergoing total secondary reflection between the scattering layer 140 and the sensor part 130.
In a variation, an air gap may be formed between the sensor component 130 and a side of the scattering layer 140 away from the light source component 120, as shown in fig. 1, which is favorable for improving the flexibility of the position arrangement between the components in the image capturing apparatus 100 and reducing the thickness of the scattering layer 140.
Since the second surface 120b of the light source member 120 has poor light transmittance, even if the light is reflected in the air gap between the sensor member 130 and the scattering layer 140 after the light incident on the point C is scattered by the scattering layer 140 and passes through the second surface 120b of the light source member 120 and the scattering layer 140, the light is reflected when it reaches the second surface 120b of the light source member 120 again, and finally reaches the sensor member 130.
Therefore, by adopting the scheme of the embodiment, the secondary total reflection can be effectively prevented, and the signal light can be ensured to be successfully incident to the sensor component. In particular, the design of the scattering layer can effectively reduce the probability of total reflection of incident light at the second surface of the light source component, thereby making it possible to prevent secondary total reflection.
In an embodiment, the image capturing apparatus 100 according to the embodiment can be applied to electronic devices such as a mobile phone, a smart band, and a wrist watch.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. An image acquisition apparatus comprising:
the light-transmitting cover plate is provided with a first face and a second face which are opposite to each other in the thickness direction, and the first face of the light-transmitting cover plate is suitable for being in contact with an object to be collected;
a light source member having a first surface and a second surface opposite to each other in a thickness direction, the first surface of the light source member being disposed toward the second surface of the light-transmitting cover plate;
a sensor member provided on a second surface of the light source member;
it is characterized by also comprising:
and the scattering layer is coated on the second surface of the light source component and is suitable for scattering incident light.
2. The image acquisition device according to claim 1, wherein the material of the scattering layer is optical cement, and scattering particles are filled in the optical cement.
3. The image acquisition device of claim 2, wherein the scattering particles are selected from the group consisting of: air bubbles, nano-materials.
4. The image acquisition device of claim 2, wherein the scattering particles have a diameter less than one-fifteenth of the wavelength of the incident light.
5. The image acquisition device as claimed in claim 2, wherein the larger the packing density of the scattering particles in the optical cement, the stronger the scattering of the incident light.
6. The image acquisition device of claim 1, wherein the scattering layer has a thickness of less than 500 microns.
7. The image capturing device as claimed in claim 1, wherein the light source unit is a display panel.
8. The image capture device of claim 7, wherein the display panel is selected from the group consisting of: liquid crystal display screen, active array organic light emitting diode display screen and little light emitting diode display screen.
9. An image acquisition device according to any one of claims 1 to 8, wherein the sensor component is attached to a side of the scattering layer remote from the light source component.
10. An image acquisition device according to any one of claims 1 to 8, wherein an air gap is provided between the sensor component and a side of the scattering layer remote from the light source component.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910402190.2A CN111950322A (en) | 2019-05-14 | 2019-05-14 | Image acquisition device |
| US16/869,318 US11582373B2 (en) | 2019-05-08 | 2020-05-07 | Image capturing apparatus and method, storage medium and electronic equipment |
| TW109115214A TWI811540B (en) | 2019-05-08 | 2020-05-07 | Image acquisition method, device, storage medium, and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910402190.2A CN111950322A (en) | 2019-05-14 | 2019-05-14 | Image acquisition device |
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| CN111950322A true CN111950322A (en) | 2020-11-17 |
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| CN201910402190.2A Pending CN111950322A (en) | 2019-05-08 | 2019-05-14 | Image acquisition device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022252623A1 (en) * | 2021-05-31 | 2022-12-08 | 荣耀终端有限公司 | Electronic device, display assembly, and manufacturing method therefor |
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| CN105550664A (en) * | 2016-01-08 | 2016-05-04 | 上海箩箕技术有限公司 | Optical fingerprint sensor module |
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