CN213518294U

CN213518294U - Optical biological identification module and electronic equipment

Info

Publication number: CN213518294U
Application number: CN202023212761.3U
Authority: CN
Inventors: 姜桐; 黄昊; 姜洪霖; 杨成龙
Original assignee: Shanghai Feigeen Microelectronics Technology Co ltd
Current assignee: Shanghai Feigeen Microelectronics Technology Co ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-06-22
Anticipated expiration: 2030-12-28

Abstract

The utility model discloses an optics biological identification module and electronic equipment, include: a microlens array formed by a plurality of microlens units; the signal acquisition array is formed by a plurality of optical signal acquisition units and is positioned below the micro lens array; and a diaphragm array formed by a plurality of diaphragm units; in the plurality of diaphragm units, each diaphragm unit is composed of more than 2 layers of light filtering film layers, and the more than 2 layers of light filtering film layers are integrated into a whole. The utility model discloses the extinction diaphragm that forms can satisfy the demand of small-size diaphragm structure.

Description

Optical biological identification module and electronic equipment

Technical Field

The utility model belongs to the electron field, concretely relates to optics biological identification module and an electronic equipment.

Background

The stray light eliminating diaphragm of the fingerprint identification device optical path structure is used for blocking visible light from passing through, and the manufacturing of the existing stray light eliminating diaphragm comprises the following steps (as shown in figure 1):

s01, coring the substrate;

s02, coating black photoresist (photosensitive ink) to cover the substrate, and forming a shading film layer by photoetching;

and S03, forming an extinction diaphragm pattern structure shown in the figure 2.

In fig. 2, an extinction diaphragm 2 is formed on a chip base 1.

Due to the limitation of resolution, when the size h of the pattern of the formed extinction diaphragm 2 is smaller than 4um, the pattern is easy to fall off, so that the effect of the diaphragm structure is ineffective, and the requirement of a small-size diaphragm structure cannot be met.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned defect, on the one hand, the utility model provides an optics biological identification module, this optics biological identification module can satisfy the demand of small-size diaphragm structure.

The utility model also provides an optics biological identification module.

An optical biometric module comprising:

a microlens array formed by a plurality of microlens units;

the signal acquisition array is formed by a plurality of optical signal acquisition units and is positioned below the micro lens array; and

a diaphragm array formed by a plurality of diaphragm units;

in the plurality of diaphragm units, each diaphragm unit is composed of more than 2 layers of light filtering film layers, and the more than 2 layers of light filtering film layers are integrated into a whole.

Optionally, the 2 or more filter film layers include a blue filter film layer and a red filter film layer, and the red filter film layer is integrated on the blue filter film layer.

Optionally, the 2 or more filter film layers include a green filter film, a blue filter film layer and a red filter film layer, the blue filter film layer is integrated on the green filter film, and the red filter film layer is integrated on the blue filter film layer.

Optionally, the optical biometric module further comprises a field stop.

Optionally, the optical biological recognition module further comprises an optical filling layer.

In one aspect, the utility model also provides an electronic equipment.

An electronic device comprises a display screen and an optical biological identification module, wherein the optical biological identification module is the optical biological identification module.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model discloses a with the different preparation methods of prior art's extinction diaphragm, the extinction diaphragm of preparing can satisfy small-size diaphragm structure.

The utility model discloses utilize the spectral characteristic of green, blue, red three-colour filter coating, be in the same place the three filter coating is integrated, can block the visible light, realize the miscellaneous light diaphragm effect that disappears of fingerprint identification device light path structure.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a schematic diagram of the background art of the present invention;

FIG. 2 is a schematic diagram of a background art extinction diaphragm of the present invention;

FIG. 3 is a schematic flow chart of example 1;

FIG. 4 is a schematic view of an extinction diaphragm structure formed in example 1;

FIG. 5 is a schematic flow chart of example 2;

FIG. 6 is a schematic view of an extinction diaphragm structure formed in example 2;

FIG. 7 is a spectrum curve of an extinction diaphragm formed by the background art of the present invention;

FIG. 8 is a plot of the extinction diaphragm spectrum formed in example 1;

FIG. 9 is a plot of the extinction diaphragm spectrum formed in example 2;

FIG. 10 is a schematic structural view of an optical biometric identification module according to the present invention;

fig. 11 is a schematic top view of an electronic device according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The technical solution of the present invention will be described in detail with specific examples. The following embodiments may be combined with each other and may not be described in detail in some embodiments for the same or similar concepts or processes.

As a common application scenario, the optical biometric identification module structure provided in the embodiment of the present application can be applied to smart phones, tablet computers, and other mobile terminals or other terminal devices having a display screen, and the technical scheme of the embodiment of the present application can be used for biometric identification technology. The biometric technology includes, but is not limited to, fingerprint recognition, palm print recognition, iris recognition, face recognition, and other recognition technologies. For convenience of explanation, the fingerprint identification technology is described as an example below.

More specifically, in the terminal device, the optical biometric module structure may be disposed in a partial area or an entire area below the display screen, thereby forming an off-screen optical biometric system.

Example 1

Referring to fig. 3-4, fig. 3 is a schematic flow chart of the present embodiment, and fig. 4 is a schematic diagram of an extinction diaphragm structure formed in the present embodiment.

A manufacturing method of an extinction diaphragm comprises the following steps:

s01, coring the substrate; the chip substrate is a substrate for manufacturing the extinction diaphragm, and can be a chip after the filling layer is finished or a chip after the lens array is finished.

And S02, coating more than 2 layers of photoresist to cover the chip substrate of S01, and forming more than 2 layers of filter film patterns.

S02 further includes the steps of:

s021, coating blue photoresist to cover the chip substrate of S01, and photoetching to form a blue filter film pattern.

S022, coating red photoresist to cover the pattern with the blue filter film, and photoetching to form a red filter film pattern.

And S03, forming an extinction diaphragm pattern structure shown in the figure 4.

In fig. 4, a blue filter pattern 21 is formed on the chip base 1, and a red filter pattern 22 is formed on the blue filter pattern 21. The blue filter pattern 21 and the red filter pattern 22 constitute an extinction diaphragm 2.

In this embodiment, the extinction diaphragm 2 formed by combining the blue filter film pattern 21 and the red filter film pattern 22 can block visible light; the resolution ratio of the extinction diaphragm 2 is small, and a pattern of 2um can be formed by photoetching, so that the requirement of a small-size diaphragm structure can be met.

In this embodiment, the blue photoresist and the red photoresist are negative photoresists, and after being irradiated by ultraviolet light, the part not irradiated by light is removed in development, and the irradiated part is retained, so as to form a required structural pattern.

Example 2

Referring to fig. 5-6, fig. 5 is a schematic flow chart of the present embodiment, and fig. 6 is a schematic diagram of an extinction diaphragm structure formed in the present embodiment.

S02 further includes the steps of:

s021, coating a green photoresist to cover the substrate, and photoetching to form a green light filtering film pattern;

s022, coating blue photoresist to cover the green filter film, and photoetching to form a blue filter film pattern;

s023, coating red photoresist to cover the green and blue filter coatings, and photoetching to form a red filter coating graph;

and S03, forming an extinction diaphragm pattern structure shown in the figure 6.

In fig. 6, a green filter image 23 is formed on the chip base 1, a blue filter pattern 21 is formed on the green filter image 23, and a red filter pattern 22 is formed on the blue filter pattern 21. The green filter pattern 23, the blue filter pattern 21 and the red filter pattern 22 constitute an extinction diaphragm 2.

In this embodiment, the extinction diaphragm 2 formed by combining the green filter film image 23, the blue filter film pattern 21 and the red filter film pattern 22 can block visible light; the resolution ratio of the extinction diaphragm 2 is small, and a pattern of 2um can be formed by photoetching, so that the requirement of a small-size diaphragm structure can be met.

In this embodiment, the green photoresist, the blue photoresist and the red photoresist are negative photoresists, and after being irradiated by ultraviolet light, the part which is not irradiated by light is removed in development, and the irradiated part is retained, so that a required structural pattern is formed.

The extinction diaphragm 2 formed in the background art, example 1 and example 2 respectively was subjected to a spectrum test, and the results are shown in fig. 7 to fig. 9. Fig. 7 is an extinction diaphragm spectrum curve formed in the background art, fig. 8 is an extinction diaphragm spectrum curve formed in embodiment 1, and fig. 9 is an extinction diaphragm spectrum curve formed in embodiment 2.

7-9, the size of the diaphragm of FIG. 7 is limited, or the pattern falling phenomenon is easy to occur when the diaphragm is small, so that the chip is broken. The diaphragm of FIG. 9 has stronger extinction capability, the light blocking rate of the extinction diaphragm of FIG. 8 to the visible light wave band of 350nm-750nm is more than 87%, and the light blocking rate of the extinction diaphragm of FIG. 9 to the visible light wave band of 350nm-750nm is more than 98%.

Based on the manufacturing approach of the extinction diaphragm of above-mentioned

embodiment

1 and 2, the utility model discloses still provide an optics biological identification module.

Referring to fig. 10, fig. 10 is a schematic structural diagram of an optical biometric identification module.

An optical biological identification module comprises a micro-lens array formed by a plurality of micro-lens units 3, a diaphragm array formed by a plurality of diaphragm units 2 and a signal acquisition array formed by a plurality of optical signal acquisition units 5, wherein the diaphragm array is an extinction diaphragm manufactured in embodiment 1 and embodiment 2.

Optionally, the optical biometric module further comprises a field stop 4.

Optionally, the optical biometric module further comprises an optical filling layer 6.

Based on foretell optics biological identification module, the utility model also provides an electronic equipment.

Referring to fig. 11, fig. 11 is a schematic top view of an electronic device according to the present invention.

An electronic device comprises a display screen 7 and the optical biological identification module. The optical biological recognition module is arranged at a local area 8 below the display screen 7. In the recognition, the finger 8 is placed at the local region 8.

In the description of the present invention, it is to be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, an indirect connection via an intermediary, a connection between two elements, or an interaction between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically stated otherwise.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. An optical biometric module comprising:

a microlens array formed by a plurality of microlens units;

a diaphragm array formed by a plurality of diaphragm units;

2. The optical biometric module of claim 1, wherein the 2 or more filter layers include a blue filter layer and a red filter layer, and the red filter layer is integrated on the blue filter layer.

3. The optical biological recognition module of claim 1, wherein the 2 or more filter layers comprise a green filter layer, a blue filter layer and a red filter layer, the blue filter layer is integrated on the green filter layer, and the red filter layer is integrated on the blue filter layer.

4. The optical biometric module of any one of claims 1 to 3, further comprising a field stop.

5. The optical biometric module of any one of claims 1 to 3, further comprising an optical filler layer.

6. The optical biometric module of claim 4, further comprising an optical filler layer.

7. An electronic device comprising a display screen and an optical biometric module, wherein the optical biometric module is the optical biometric module according to any one of claims 1 to 3.

8. An electronic device comprising a display screen and an optical biometric module, wherein the optical biometric module is the optical biometric module of claim 4.

9. An electronic device comprising a display screen and an optical biometric module, wherein the optical biometric module is the optical biometric module of claim 5.

10. An electronic device comprising a display screen and an optical biometric module, wherein the optical biometric module is the optical biometric module of claim 5.