CN107958180B - Light guide element, photoelectric sensing module and electronic device - Google Patents
Light guide element, photoelectric sensing module and electronic device Download PDFInfo
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- CN107958180B CN107958180B CN201710353446.6A CN201710353446A CN107958180B CN 107958180 B CN107958180 B CN 107958180B CN 201710353446 A CN201710353446 A CN 201710353446A CN 107958180 B CN107958180 B CN 107958180B
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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
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
Abstract
The invention discloses a light guide element, a photoelectric sensing module and an electronic device with the light guide element. The light guide element includes: the light guide device comprises light guide parts arranged on the light sensor device, each light guide part comprises a plurality of first areas for light to pass through and a plurality of second areas for preventing light to pass through, the first areas are not communicated with each other, the light sensor comprises a light receiving unit, when light on the light receiving unit enters the light guide parts, the light with the incident angle larger than a preset angle reaches the light receiving unit in the first areas through total reflection transmission, the light with the incident angle smaller than the preset angle cannot be totally reflected in the first areas and lost, and the preset angle is a critical angle of total reflection of the light in the first areas of the light guide parts. The light guide element is arranged on the photoelectric sensing module, and the electronic device comprises the photoelectric sensing module.
Description
Technical Field
The present invention relates to the field of biometric identification, and more particularly, to a light guide device, a photoelectric sensor module and an electronic device having the same.
Background
Currently, the photoelectric sensing module, such as the fingerprint recognition module, has gradually become the standard component of electronic products such as mobile terminals. However, the image acquisition precision of the photoelectric sensing module needs to be improved.
Disclosure of Invention
The embodiment of the invention aims to solve at least one technical problem in the prior art. Therefore, the present invention is to provide a light guide element, a photoelectric sensing module and an electronic device having the photoelectric sensing module.
The light guide element comprises light guide parts arranged on a light sensing device, each light guide part comprises a plurality of first areas for light to pass through and a plurality of second areas for preventing the light from passing through, the first areas are not communicated with each other, the light sensor comprises a light receiving unit, when light on the light receiving unit enters the light guide parts, the light with the incident angle larger than a preset angle is transmitted to the light receiving unit through total reflection in the first areas, the light with the incident angle smaller than the preset angle cannot be lost due to total reflection in the first areas, and the preset angle is a critical angle of total reflection of the light in the first areas of the light guide parts.
In some embodiments, the light sensing device includes a light receiving unit, and the light guide portion includes a first light guide portion disposed on the light receiving unit.
In some embodiments, the light sensing device further includes a light transmitting unit, the light guide portion further includes a second light guide portion, and the second light guide portion is disposed on the light transmitting unit.
In some embodiments, the light guide portion includes a plurality of light passing ducts, and duct walls of the light passing ducts are attached to each other to form the first region.
In some embodiments, a pipe diameter of a light passing pipe of the light guide part on the light receiving unit is smaller than a pipe diameter of a light passing pipe of the light guide part on the light sending unit.
In some embodiments, the first region is formed of a light transmissive material.
In some embodiments, the second region is formed of a light filtering material or a light absorbing material.
In some embodiments, a cross-sectional area of a first region in the light guide portion on the light receiving unit is smaller than a cross-sectional area of a first region in the light guide portion on the light transmitting unit.
In some embodiments, the light guide portion on the light sending unit is disposed obliquely in a desired light transmission direction.
In some embodiments, the second light guide part is obliquely disposed toward a side close to the first light guide part.
In some embodiments, the inclination angle of the second light guide part is 35 ° to 65 °.
In some embodiments, the light guide element further includes a first light blocking wall disposed between the first light guide part and the second light guide part.
In some embodiments, the light guide element further includes a second light blocking wall disposed outside the second light guide part.
In some embodiments, the light beam on the light receiving unit enters a predetermined region, and the light beam with the incident angle larger than a preset angle is totally reflected in the predetermined region.
In some embodiments, the cross-sectional shape of the light passing conduit is circular, elliptical, triangular row, polygonal, or irregular.
In some embodiments, the tube diameter of the light-passing duct of the light guide part on the light receiving unit is less than 25 um.
In some embodiments, the light guide element is used in an optical image sensing module.
The photoelectric sensing module comprises a light sensing device and the light guide element of any one of the above embodiments arranged on the light sensing device.
An electronic device according to an embodiment of the present invention includes the photoelectric sensing module according to any one of the above embodiments.
Through setting up leaded light component for the photoelectric sensing module has following a bit when carrying out biological identification:
(1) when the photoelectric sensing module carries out light sensing, adjacent light is prevented from passing through the light guide element, so that the light signals received by the light sensing unit below the light guide element avoid the interference of the adjacent light, the accuracy and the definition of light collection are improved, and the accuracy of biological identification is improved.
(2) The light guide element can be independently prepared and then arranged in the photoelectric sensing module, thereby greatly accelerating the preparation process of the photoelectric sensing module.
(3) The light guide element can control light transmission on the light receiving unit, avoids mutual interference between adjacent lights, and can control light transmission on the light transmitting unit, so that the light emitted by the light source can be transmitted towards the protective cover plate according to a preset transmission direction, the light signal intensity reaching the protective cover plate is increased, the definition of light collection is improved, and the accuracy of biological identification is improved.
Additional aspects and advantages of embodiments of the invention 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 invention.
Drawings
The above and/or additional aspects and advantages of embodiments of the present invention 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 diagram of an optical path of an optical fingerprint identification module according to the present invention for performing fingerprint identification;
FIG. 2 is a schematic cross-sectional view of a light guide element according to an embodiment of the present invention;
FIG. 3 is a schematic top view of another embodiment of a light guide element according to an embodiment of the present invention;
FIG. 4a is a schematic top view of a light guide element according to another embodiment of the present invention;
FIG. 4b is a schematic top view of a light guide element according to another embodiment of the present invention;
FIG. 5 is a schematic diagram showing the optical path of light passing through a light guide element according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an embodiment of a photoelectric sensor module according to the present invention;
FIG. 7 is a schematic diagram of an optical path in the optoelectronic sensing module according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of another embodiment of a photoelectric sensor module according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a photoelectric sensing module according to another embodiment of the present invention;
FIG. 10 is a schematic structural diagram of a photoelectric sensor module according to yet another embodiment of the present invention;
fig. 11 is a schematic plan view of an electronic device according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and settings of a specific example are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
Further, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention can be practiced without one or more of the specific details, or with other structures, components, and so forth. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the invention.
A conventional photoelectric sensing module, for example, as shown in fig. 1, includes a base plate 101, a light source 102 disposed on the base plate 101, a light sensing unit 103, and a protective cover plate 104. The photo sensing unit 103 is located inside the light source 102 and includes an array structure formed of a plurality of photo sensing devices. When the finger 105 is placed on the protective cover 104, the light emitted from the light source 102 reaches the protective cover 104, and since the finger fingerprint has two parts, namely, valleys and ridges, the part of the light passing through the ridges will be diffusely reflected, and the part of the light passing through the valleys will be specularly reflected. The reflected light is received by the light sensing unit 103, and the received light signal is converted into a corresponding electrical signal by the light sensing unit 103 and transmitted to the signal processing circuit. Because the reflection signals of the valleys and the ridges of the fingerprint have a large difference, that is, the electrical signal output by the photo-sensing device receiving the reflection signal of the valley of the fingerprint is strong, and the electrical signal output by the photo-sensing device receiving the reflection signal of the ridge of the fingerprint is weak, the signal processing circuit determines the positions of the ridges and the valleys of the fingerprint according to the intensity of the electrical signal output by each photo-sensing device in the photo-sensing unit 103, so as to form a fingerprint image.
However, since the distance between the valleys and the ridges of the fingerprint is very small, and the light rays are diffusely reflected by the ridges of the fingerprint, the adjacent reflected signals interfere with each other, and the reflected signals actually received by the light sensing devices in the light sensing unit 103 cannot reflect the real reflected signals, so that the definition and accuracy of the fingerprint image collected by the optical fingerprint sensor are low.
In view of the above, the present invention provides a light guide element, which can be applied to a photoelectric sensing module, especially an optical image recognition module, where the optical image recognition module senses image information of a target object to recognize the identity of the target object according to the sensed image information. The image information may include fingerprint information, palm print information, ear print information, and skin texture information of other positions of the human body. Of course, it is not excluded that the light guide element is applied to other optical recognition technologies to solve the problem of image acquisition by light.
The light guide element is mainly disposed on the light sensing device to control the transmission of light emitted or received by the light sensing device, for example, to remove light outside a predetermined area so that the light is transmitted in the predetermined area. Therefore, adjacent light rays cannot interfere with each other, and the accuracy and the definition of light ray collection are improved.
Referring to fig. 2, a light guide element 200 according to an embodiment of the present invention includes a light guide portion 210 disposed on a photo-sensor device. Each light guide part 210 includes a plurality of first regions 211 through which light can pass and a plurality of second regions 212 through which light can be blocked. That is, light enters from one side of the light guide part 210, and when passing through the first region 211, the light enters the first region 211, is transmitted in the first region 211, and is emitted from the other side of the light guide part 210; when the light passes through the second region 212, the light is blocked by the second region 212, so that the light passing through the second region 212 does not pass through or is very weak, and the light sensing of the light sensing unit 303 is not affected basically, so that adjacent light does not interfere with each other, and the accuracy and definition of light collection are improved.
In some examples, the light guide portion 210 may be integrated, as shown in fig. 3, the second regions 212 are connected to each other to define a plurality of first regions 211, and the first regions 211 are not connected to each other. This makes the fabrication process of the light guide 210 simpler and increases the structural strength of the light guide 210. Furthermore, the light guide portion 210 of the integrated structure is also conveniently disposed on the photo-sensing device.
Referring to fig. 4a and 4b, the light guide portion 210 in this embodiment may include a plurality of light transmission channels 213, and the light transmission channels 213 are bonded, bound, or the like to form the light guide portion 210. The light pipe 213 includes a pipe wall 2131 and a light passage, i.e., a light hole 2132, surrounded by the pipe wall 2131. The tube walls 2131 of the light transmitting ducts 213 jointly form the second region 212, and the light transmitting holes 2132 of the light transmitting ducts 213 jointly form the first region 211. The cross-sectional shape of the light passing hole 2132 may be circular, oval, triangular, polygonal, etc. Since the light guide portion 210 is formed by bonding the light transmitting pipes 213, the light transmitting pipes 213 having a triangular or polygonal shape can be bonded without a gap therebetween, thereby preventing light from passing through the gap between the light transmitting pipes 213. Of course, if the aperture of the light transmitting pipe 213 is sufficiently small, a substantially seamless space between the light transmitting pipes 213 of other shapes can be realized. Alternatively, the gaps between the light pipes 213 may also be filled with a filling material to form a part of the second region 212.
In order to reduce mutual interference between adjacent light rays, the aperture of the light passing hole 2132 is as small as possible, for example, lower than 25 um; furthermore, the wall of the light-transmitting duct 213 is as thin as possible, for example 1-2 um.
The light-transmitting duct 213 may be independently prepared and then fixed by bonding, binding, or the like to form the light-guiding portion 210, thereby speeding up the preparation process of the light-guiding portion 210. The light-passing duct 213 can also be implemented by using an existing structure, such as an optical fiber. Thus simplifying the preparation process and reducing the preparation cost.
The principle of total reflection of light is used for the light transmission in the first area 211, as shown in fig. 5, taking the through hole 2132 as an example, after the light enters from one end of the through hole 2132, the light L1 entering vertically will exit vertically from the other end of the through hole 2132 along the through hole 2132, when the angle θ between the light L2 and the normal M1 perpendicular to the inner wall of the through hole 2132 is larger than the critical angle of the through hole 2132, the light will be totally reflected in the through hole 2132, and will exit from the other end of the through hole 2132 after multiple total reflections, since the light will not lose energy if it is totally reflected during the light transmission in the light guide 210, or the energy will be lost, in other words, when the incident angle (e.g., θ shown in fig. 5) of the light entering the light guide 210 is larger than the critical angle of total reflection of the light guide 210, the light will not lose energy in the first area 211 of the light guide 210, when the incident angle of the light entering the light guide 210 is smaller than the critical angle of total reflection, the critical angle of the light 210, the light will not be lost, and the light will be prevented from interfering with the light path of the light entering the light guide 210.
Referring to fig. 2, in other embodiments, the first region 211 in the light guide portion 210 is formed by a light transmissive material, and the second region 212 is formed by a light filtering material or a light absorbing material. Since the first region 211 is to ensure light to pass through, the light-transmitting material may be a material with a relatively high light transmittance, such as glass, PMMA (acrylic), PC (polycarbonate), or the like. The second region 212 needs to prevent light from passing through, so the second region 212 is made of a light absorbing material with a good light absorbing effect, such as black carbon material, glass fiber cotton, and the like. Of course, the second region 212 may also be selected to be a filter material, which filters most of the light and only a small amount of the light is left to pass through. In this way, the small amount of light does not substantially interfere with adjacent light, thereby also improving the accuracy of light collection.
In order to avoid mutual interference between adjacent light rays and improve the accuracy and definition of light ray collection, the cross-sectional area of the first region 211 and the cross-sectional area of the second region 212 are as small as possible, and the cross-sectional area of the first region is larger than that of the second region.
The light guide part 210 may be formed by first forming the second region 212 and then filling the region surrounded by the second region 212 with a light transmissive material to form the first region 211. Of course, the first region 211 may be formed first, and then the light absorbing material may be filled in the region surrounded by the first region 211 to form the second region 212. Since the first regions 211 may be formed together and the second regions 212 may be formed together, the manufacturing process of the light guide part 210 is more simplified.
In other embodiments, the first region 211 may also be a through hole, so that only the second region 212 may be formed, and the region surrounded by the second region 212 forms the first region 211. Of course, it is also possible to provide a plate of light absorbing material and then form the first regions 211 on the plate by means of laser or the like.
Referring to fig. 6, when the light guide element with the light guide part is applied to the photoelectric sensing module 300, the photoelectric sensing module 300 may include a bottom plate 301 and a protective cover plate 302, which are vertically disposed, and the bottom plate 301 is provided with a light sensing unit 303 and a light source 304. The photo sensing unit 303 includes a plurality of photo sensing devices, which may be formed along an array or in other arrangements. The light source 304 is disposed outside the light sensing unit 303. The light source 304 may be a self-emitting structure, such as an organic light emitting diode. Of course, the light source 304 may be disposed under the bottom plate 301, and the bottom plate 301 is made of a light-transmitting material, or a through hole structure for allowing light emitted from the light source 304 to pass through is formed on the bottom plate 301. In some examples, the light source 304 is disposed at a side of the bottom plate 303, and light emitted from the light source 304 is guided to the protective cover plate 302 by a light guide plate or a light guide strip. The light emitted from the light source 304 forms the light-sending region S2; the light reflected from the light source 304 through the protective cover 302 and the finger is received by the photo sensing unit 303, and the reflected light forms a light receiving area S1.
The photo sensor module 300 further has a light guide element 400, and the light guide element 400 is disposed above the photo sensing unit 303 and the light source 304, i.e. below the protective cover 302. The light guiding element 400 comprises a first light guiding part 410 arranged on the light receiving unit, i.e. the light sensing unit 303, and a second light guiding part 420 arranged on the light transmitting unit, i.e. the light source 304. The second light guide part 420 is correspondingly disposed on the light source 304, and is used for making the light emitted from the light source 304 propagate to the protective cover plate 302 according to a predetermined direction. The first light guide portion 410 is disposed on the photo-sensing unit 303, and is used for allowing the light reflected by the protective cover 302 and the finger to accurately reach the photo-sensing unit 303, and adjacent light beams do not interfere with each other.
In some embodiments, the surface area of the first light guide part 410 is equal to or slightly larger than the surface area of the light sensing unit 303, so that the first light guide part 410 completely covers the light sensing unit 303. The surface area of the second light guide part 420 is equal to or slightly larger than the surface area of the light source 304, so that the second light guide part 420 completely covers the light source 304.
Referring to fig. 7, when a finger 600 is placed on the protective cover 302, light emitted from the light source 304 passes through the second light guide portion 420, reaches the protective cover 302 through a direction perpendicular to the protective cover 302 or a direction perpendicular to the protective cover, and is reflected by ridges and valleys of the fingerprint of the finger, and the reflected signal is received by the light sensing unit 303 after passing through the first light guide portion 410. When the light passes through the valley portion of the fingerprint, the valley portion is not in contact with the protective cover 302, so the light of the portion is totally reflected, and the reflected light passes through the first light guide portion 410, and is received by the photo-sensing device 303a and the photo-sensing device 303b of the photo-sensing unit 303 without being interfered by the reflected light of the adjacent ridge portion. When light passes through the ridge portion of the fingerprint, the ridge portion is in contact with the protective cover plate 302, so that the light of the portion is subjected to diffuse reflection, after the reflected light passes through the first light guide portion 410, because adjacent light passes through the first light guide portion 410, the light is prevented by the second area of the first light guide portion 410, or when the light enters the second area of the first light guide portion 410, the incident angle is smaller than or equal to the critical angle of total reflection of the first light guide portion 410, total reflection cannot occur, and the light will cause energy loss in the propagation process in the first area of the first light guide portion 410, that is, the intensity of the light passing through the first light guide portion 410 is very weak, and the light sensing of the photo-sensing device is not affected substantially. Thus, the accuracy of light collection is improved through the arrangement of the light guide element 400, and the accuracy of fingerprint identification is further improved.
The structures of the first light guide portion 410 and the second light guide portion 420 may be referred to as the structures of the light guide portions. However, alternatively, the second light guiding part 420 needs to ensure complete light transmission, and thus in some embodiments, the second light guiding part 420 may not be provided with any structure or may be provided with a light-transmitting material layer.
In addition, in order to ensure that the light sensing unit 303 can sense more light, that is, to ensure that as much light emitted from the light source 304 propagates to the protective cover 302 as possible, the diameter of the light guide portion disposed on the light source 304, that is, the second light guide portion 420, may be slightly larger than the diameter of the light guide pipe of the first light guide portion 410, that is, larger than 25 um. Similarly, in another structure of the light guide portion, the light guide portion provided in the light source 304, that is, the second light guide portion 420 may be configured such that the cross-sectional area of the first region is slightly larger than the cross-sectional area of the first region in the first light guide portion 410.
In some embodiments, as shown in fig. 8, in order to avoid the light of the light source 304 from interfering with the sensing of the light sensing unit 303, the light guiding element 400 is provided with a first light shielding wall 430 at the adjacent position between the light emitting region S2 of the light source 304 and the light sensing region S1 of the light sensing unit 303, that is, the first light shielding wall 430 is provided between the first light guiding portion 410 and the second light guiding portion 420. The light receiving area S1 and the light transmitting area S2 can be effectively isolated by the first light shielding wall 430, so as to prevent the light emitted from the light source 304 from affecting the light sensing of the light sensing unit 303.
Referring to fig. 9, since the light source 304 is disposed around the light sensing unit 303, that is, the light sensing unit 303 is located in the middle, and the light source 304 is located outside the light sensing unit 303, in order to enable light emitted by the light source 304 to accurately reach the light sensing unit 303 and be absorbed by the light sensing unit 303 after being reflected by the protective cover 302 and the finger 600, the second light guiding portion 420 is disposed obliquely inward, that is, close to the first light guiding portion 410, in some embodiments, the inclination angle β of the second light guiding portion 420 is 35 ° to 65 °.
However, in other embodiments, the installation angle of the light source 304 may be set such that the light emitted from the light source 304 is inclined inward, as shown in fig. 10, and the installation plane of the light source 304 and the installation plane of the light sensing unit 303 form an included angle of 25 ° to 55 °.
With continued reference to fig. 9, in other embodiments, in order to prevent the light of the light source 304 from diverging so that the light rays of the light source 304 all propagate toward the protective cover 302, the light guide element 400 further includes a second light shielding wall 440 disposed at the outermost side of the light sending region S2, i.e., the second light shielding wall 440 is disposed at the outer side of the second light guiding portion 420. Therefore, the light emitted by the light source 304 is transmitted toward the protective cover plate 302 along the second light guide part 420, so that light loss is avoided, the luminous illumination is increased, the intensity of the light sensed by the light sensing unit 303 is increased, and the definition of light collection is further improved.
The structure of the light guide element 400 is only an example of the photoelectric sensor module applied to the above embodiment, and the structure of the light guide element 400 is not limited. The light guide element can be applied to photoelectric sensing modules with other structures through corresponding deformation, such as the position relationship, the size, the specific structure and the like of the first light guide part and the second light guide part, which is not exemplified here.
Referring to fig. 11, an electronic device 500 according to an embodiment of the present invention includes the photoelectric sensing module obtained by the preparation method according to any one of the above embodiments.
In the electronic device 500, since the photo sensor module is provided with the light guide element, when the target object is located on the photo sensor module, the light emitted from the light source passes through the protective cover plate for protecting the photo sensor module and the light reflected by the finger, and then passes through the light guide element and is collected by the photo sensing unit. And the light guide element can effectively avoid mutual interference between adjacent light rays, particularly interference of reflected light rays of diffuse reflection generated when the light rays pass through the ridge part of a finger to the adjacent light rays, so that the image precision of a target object is improved when the electronic device using the photoelectric sensing module carries out image acquisition.
Specifically, the electronic device 500 is, for example, a consumer electronic product, a home electronic product, or a vehicle-mounted electronic product. The consumer electronic products are various electronic products applying biometric identification technology, such as mobile phones, tablet computers, notebook computers, desktop displays, all-in-one computers and the like. The household electronic products are various electronic products applying biological identification technology, such as intelligent door locks, televisions, refrigerators, wearable equipment and the like. The vehicle-mounted electronic products are vehicle-mounted navigators, vehicle-mounted DVDs and the like.
In the example of fig. 11, the electronic device 500 is a mobile phone, the front surface of the mobile phone is provided with the touch screen and display device 400, and the photoelectric sensing module is disposed under the front cover of the electronic device 500. In an example, when the biometric information that needs to be collected is fingerprint information, when fingerprint information collection is performed, the target object 200 is a finger, and the finger is placed on the electronic device 500, so that the touch screen can determine the contact area of the finger on the photoelectric sensing module 100, and the photoelectric sensing module 100 collects subsequent fingerprint information.
However, alternatively, in other embodiments, the photoelectric sensing module 100 may also be disposed on the touch screen and display device 400. In addition, the image capturing portion of the optoelectronic sensing module 100 may also be integrated as a biometric chip, and correspondingly disposed at a front, a back, and a side of the electronic device 500, and the image capturing portion may either expose the outer surface of the electronic device 500 or be disposed inside the electronic device 500 and adjacent to the housing.
It should be noted that the above examples are provided for the convenience of understanding the embodiments of the present invention, and should not be construed as limiting the scope of the present invention.
In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., mean 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 invention. 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 such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention.
Claims (18)
1. The utility model provides a light guide element, its characterized in that, is including setting up the light guide part on the light sensing device, and every light guide part includes a plurality of first regions that can supply the light to pass through and a plurality of second regions that prevent the light to pass through, just each other not communicate between the first region, light sensor includes the light receiving unit, when light on the light receiving unit gets into the light guide part, the incident angle is greater than the light of predetermineeing the angle and reachs through total reflection transmission in the first region light receiving unit, and the incident angle is less than the light of predetermineeing the angle and can't lose in the first regional total reflection, predetermine the angle for the critical angle of total reflection of light in the first region of light guide part.
2. The light guide element according to claim 1, wherein the light guide portion includes a first light guide portion provided on the light receiving unit.
3. The light guide element according to claim 2, wherein the light sensor device further includes a light sending unit, the light guide portion further includes a second light guide portion, and the second light guide portion is provided on the light sending unit.
4. A light guide element according to claim 2 or 3, wherein the light guide part comprises a plurality of light transmitting channels, and the channel walls of the light transmitting channels are attached to each other to form the first region.
5. The light guide element according to claim 4, wherein a tube diameter of a light passage of the light guide portion on the light receiving unit is smaller than a tube diameter of a light passage of the light guide portion on the light transmitting unit.
6. The light directing element of claim 1, wherein the first region is formed of a light transmissive material.
7. The light directing element of claim 1, wherein the second region is formed from a light filtering material or a light absorbing material.
8. The light guide element according to claim 1, wherein a cross-sectional area of a first region in the light guide portion on the light receiving unit is smaller than a cross-sectional area of a first region in the light guide portion on the light transmitting unit.
9. The light guide element according to claim 3, wherein the light guide portion on the light sending unit is disposed obliquely in a desired light transmission direction.
10. The light guide member as claimed in claim 9, wherein the second light guide portion is obliquely disposed toward a side close to the first light guide portion.
11. The light guide element according to claim 10, wherein the second light guide portions are inclined at an angle of 35 ° to 65 °.
12. A light guide element as recited in claim 3, further comprising a first light blocking wall disposed between the first light guide portion and the second light guide portion.
13. A light guide element according to claim 3 or 12, wherein the light guide element further comprises a second light shielding wall disposed outside the second light guide portion.
14. The light directing element of claim 4, wherein the cross-sectional shape of the light passing conduits is circular, elliptical, triangular, polygonal, or irregular.
15. A light guide element according to claim 4, wherein a tube diameter of a light passage of the light guide part on the light receiving unit is less than 25 um.
16. The light guide element of claim 1, wherein the light guide element is used in an optical image sensor module.
17. An optoelectronic sensor module comprising a light sensor device and a light guide element according to any one of claims 1 to 16 disposed on the light sensor device.
18. An electronic device comprising the optoelectronic sensing module of claim 17.
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| CN109979326A (en) * | 2019-03-23 | 2019-07-05 | 深圳阜时科技有限公司 | A kind of display device and electronic equipment |
| CN109948558A (en) * | 2019-03-23 | 2019-06-28 | 深圳阜时科技有限公司 | A kind of pedestal and sensing mould group |
| CN110032950B (en) * | 2019-03-23 | 2024-03-29 | 深圳阜时科技有限公司 | Base and sensing module |
| CN109977852A (en) * | 2019-03-23 | 2019-07-05 | 深圳阜时科技有限公司 | A kind of sensing mould group, display device and electronic equipment |
| CN110070799A (en) * | 2019-03-23 | 2019-07-30 | 深圳阜时科技有限公司 | A kind of display device and electronic equipment |
| CN110807418B (en) * | 2019-10-31 | 2022-12-27 | 维沃移动通信有限公司 | Electronic device |
| CN113109551B (en) * | 2021-03-30 | 2023-06-16 | 海南华盛混凝土有限公司 | Concrete slump expansion testing device |
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