TW201928765A - Optic fingerprint recognition system that comprises a light guide panel to form a fingerprint detection zone on which a finger may press - Google Patents

Abstract

An optic fingerprint recognition system is such that a light guide panel is included to provide a fingerprint detection zone on which a finger may press and a collimated optic signal is also provided. The optic signal is conducted into the light guide panel for transmission therethrough by means of total internal reflection. Finger pressing causing damage to the total internal reflection of the optic signal within the light guide panel is used to allow a light sensing element to detect the variation of a waveform of the optic signal, which is processed to form a fingerprint image. As a result, when the present invention is applied to have the optical fingerprint recognition system integrated with a display panel, the light sensing element can be hidden on the back side of the display panel without the necessity to receive the reflection light of fingerprint and without the transmittance issue. In addition, the fingerprint detection zone can be embodied in the entire or a partial area of the light guide panel, making it more flexible in use and also suiting the need of consumers for aesthetics of product appearance.

Description

Optical fingerprint identification system

The invention relates to a fingerprint identification technology, in particular to an optical fingerprint identification system that utilizes the total total reflection effect of light for sensing and identification.

Fingerprint recognition is a kind of biometric recognition technology, which uses the unique fingerprint information on the human finger to identify it, and its advantages in terms of safety and convenience are widely used; for example, today's smart phones are almost all Added fingerprint recognition function to provide fingerprint encryption and fingerprint unlocking.

An optical fingerprint identification system 10, please refer to FIG. 1, a pressure plate 12, a light diffusion plate 13 and a photosensitive element 11 are sequentially disposed from top to bottom, and a plurality of light sources 14 are disposed around the photosensitive element 11. The platen 12 has a plate surface 121 that can be pressed by a finger. The light diffusing plate 13 guides the incident light emitted from the light source 14 to the pressing plate 12, and has a through hole 131 through which the reflected light passes. When the incident light is projected by the light diffusing plate 13 to the finger A, it is reflected by the through hole 131 to the photosensitive element 11 below. Since the peak of the fingerprint reflects the light, the trough absorbs the light. Therefore, the reflected light forms a contrast stripe, allowing the photosensitive element 11 to achieve fingerprint recognition.

At present, combining the fingerprint recognition function with the display function of the display panel is a hot topic that the industry is actively studying. In the method of integrating or combining the fingerprint identification system into the display panel, if the relevant component of the fingerprint recognition is disposed above the display panel, since the photosensitive element based on the germanium wafer is opaque, it will be exposed outside the display panel. However, the problem of transparency is placed under the display panel, and the reflected light of the fingerprint may not be well received, which affects the accuracy of fingerprint recognition. Therefore, there are certain restrictions on the integration of the fingerprint identification system into the display panel, and it is difficult to not interfere with the design of the product.

Therefore, there is a need to develop an optical fingerprint identification system that can be well integrated into the display panel so that the photosensitive elements are not exposed to meet the appearance requirements of the product, which is not only different from the prior art structure, but also effectively overcomes the problem. Various missing; its specific structure and implementation will be detailed below.

In view of the above problems, the main object of the present invention is to provide an optical fingerprint identification system for allowing optical signals to be transmitted through a light-conducting panel through internal total reflection effects, thereby causing total reflection of optical signals in the light guide panel by finger pressing. Destruction to achieve the role of fingerprint recognition.

Another object of the present invention is to provide an optical fingerprint identification system, which can conceal the photosensitive element on the back side of the display panel without being exposed, and at the same time, the fingerprint sensing area can be disposed in all or part of the light guiding panel, which is better. It meets the various needs of consumers for the appearance and flexibility of the product.

Therefore, in order to achieve the above object, the present invention provides an optical fingerprint identification system, which mainly includes a light guide panel, a light source, a signal amplifier and a photosensitive element. The surface of the light guide panel has a fingerprint sensing area for pressing by a finger, and the light guiding panel is provided with a first light guiding portion and a second light guiding portion respectively at an light incident end and a light exit end. . The light source is adjacent to the first light guiding portion and provides at least one optical signal. The optical signal is introduced into the light guiding panel via the first light guiding portion and transmitted by the total total reflection effect in the light guiding panel, and then transmitted through the second guiding The light department is exported. The signal amplifier is adjacent to the second light guiding portion, and receives the optical signal derived by the second light guiding portion, and the optical signal is amplified and then derived. The photosensitive element is adjacent to the signal amplifier, and receives the optical signal derived by the signal amplifier, and processes the optical signal into a fingerprint image, thereby achieving fingerprint identification.

According to an embodiment of the invention, wherein the fingerprint sensing area may be all or a partial area of the surface of the light guiding panel.

According to an embodiment of the invention, the light guiding panel is disposed above a display panel.

According to an embodiment of the invention, the light guide panel is attached to the display panel by coating optical glue or dispensing.

According to an embodiment of the invention, the light source may be a collimated source or a non-collimated source.

According to an embodiment of the invention, wherein the light source may be a laser, a vertical cavity surfaced laser (VCSEL) or a combination of a non-collimated light source and a secondary optical element.

According to an embodiment of the invention, wherein the secondary optical element may be selected from the group consisting of a parabolic surface concentrating mirror, a compound parabolic concentrating mirror (CPC), a lens, a krypton, a Fresnel lens, and combinations thereof.

According to an embodiment of the invention, the wavelength of the optical signal is between 380 and 1400 nanometers (nm).

According to an embodiment of the present invention, when the optical signal travels in the light guide panel, an angle between the optical signal and a normal of a surface or a bottom surface of the light guide panel needs to be greater than arcsin (n ₀ / n ₂ ) and arcsin(n ₁ /n ₂ ); wherein n ₀ is the refractive index of the surface of the light guiding panel; n ₁ is the refractive index of the bottom surface of the light guiding panel; and n ₂ is the refractive index of the light guiding panel rate.

According to an embodiment of the invention, the first light guiding portion, the second light guiding portion and the light guiding panel may be an integrated structure.

According to an embodiment of the invention, the first light guiding portion and the second light guiding portion may be separately disposed with respect to the light guiding panel.

According to an embodiment of the invention, the surface of the light guiding panel is formed with a coating film, the coating film can be penetrated by a visible light, and the light of the remaining wavelength band is reflected.

According to an embodiment of the invention, the first light guiding portion and the second light guiding portion may be in the form of a mirror or an optical fiber.

According to an embodiment of the invention, the signal amplifier may be in the form of a mirror.

According to an embodiment of the invention, the photosensitive element and the signal amplifier further comprise a lens, a prism film, an angular filter, a polarization beam splitting prism (PBS), A beam splitter (BS) or a combination thereof.

According to an embodiment of the invention, the angle filter may be a vertical or tilt type grating filter.

According to an embodiment of the invention, the grating filter is a single layer structure formed by a plurality of first material film spacers.

According to an embodiment of the invention, the grating filter is a single layer structure composed of a plurality of first material films and a plurality of second material films spaced apart from each other.

According to an embodiment of the present invention, the grating filter is a multilayer structure composed of a plurality of first material films and a plurality of second material films, and the first material film of different layers in the multilayer structure Arranged or staggered.

According to an embodiment of the invention, the photosensitive elements are placed parallel or obliquely with respect to the light guiding panel.

According to an embodiment of the present invention, at least one Prism is further included between the first light guiding portion and the light source, between the second light guiding portion and the signal amplifier, or between the two places. And this is a fixed or rotatable 稜鏡.

According to the optical fingerprint identification system provided by the present invention, the internal total reflection effect of the optical signal in the light guide panel can be utilized, and the fingerprint image is obtained by detecting the waveform change of the optical signal, and when the optical fingerprint identification system and the optical fingerprint identification system When the display panel is integrated, the photosensitive element can be concealed on the back side of the display panel, and the problem of insufficient visibility can be affected, which can affect the design of the product appearance, and at the same time, a regional or comprehensive fingerprint can be designed. The sensing area allows the user to use the fingerprint recognition function more flexibly and conveniently.

The purpose, technical content, features and effects achieved by the present invention will be more readily understood by the detailed description of the embodiments. The purpose, technical contents, features and effects achieved by the present invention will be more readily understood by the detailed description of the embodiments and the accompanying drawings.

Referring to FIG. 2, a cross-sectional view of an optical fingerprint recognition system 20 provided by an embodiment of the present invention is shown. The optical fingerprint recognition system 20 is mainly composed of a light guide panel 21, a collimated light source 22, a signal amplifier 23, and a light receiving element 24.

In this embodiment, the surface of the light guide panel 21 has a fingerprint sensing area 211 that can be pressed by the finger A. In practical applications, the fingerprint sensing area 211 can be designed on all or a partial area of the surface of the light guide panel 21. In this embodiment, the light guide panel 21 has an optical entrance end 212 and a light exit end 213 on both sides, and a first light guide portion 214 and a second light guide portion 215 are respectively disposed at the light entrance end 212 and the light exit end 213. Specifically, the first light guiding portion 214 and the second light guiding portion 215 can be reflectors for adjusting the transmission angle of the optical signal. In practical applications, the positions of the light incident end 212 and the light exit end 213 can also be designed. The intermediate slit end of the light panel 21. The material of the light guide panel 21 may be glass. The first light guiding portion 214 and the second light guiding portion 215 may be in the form of a mirror or an optical fiber, and the first light guiding portion 214 and the second light guiding portion 215 are opposite to the light guiding portion. The panel 21 may be separately provided. Of course, the first light guiding portion 214 and the second light guiding portion 215 may also be designed in an integrated structure with the light guiding panel 21 .

In this embodiment, the collimated light source 22 is adjacent to the first light guiding portion 214 for providing at least one optical signal for collimation. Further, the collimated light source 22 generates a collimated optical signal, and directs the optical signal to the first light guiding portion 214. The first light guiding portion 214 reflects or transmits the optical signal, and is guided through the light incident end 212. In the light panel 21, the optical signal is transmitted in the light guide panel 21 by the Total Internal Reflection (TIR) effect, and then transmitted to the light exit end 213, and then reflected or transmitted through the second light guide portion 215.

Furthermore, in order to allow the optical signal to be totally internally reflected in the light guiding panel 21, the angle between the optical signal and the normal of the surface or the bottom surface of the light guiding panel 21 (herein referred to as the following description, referred to as incident) Angle θ), whose minimum angle is arcsin(n ₀ /n ₂ ) and arcsin(n ₁ /n ₂ ) respectively, can achieve total internal reflection. Therefore, when the optical signal travels in the light guide panel 21, the incident angle θ needs to be greater than the minimum angle required for the total internal reflection of the two, that is, the incident angle θ needs to satisfy greater than arcsin(n ₀ /n ₂ ) and Arcsin(n ₁ /n ₂ ); wherein n ₀ is a refractive index of a surface of the light guiding panel 21; n ₁ is a refractive index of a bottom surface of the light guiding panel 21; and n ₂ is a refractive index of the light guiding panel 21.

In this embodiment, the refractive index of the light guide panel 21 is 1.5. When the surface and the bottom surface of the light guide panel 21 are both adjacent to the air, the angle between the traveling direction of the optical signal in the light guide panel 21 and the surface or the bottom surface thereof is The incident angle θ is greater than 43 degrees; when only one of the surface and the bottom surface of the light guide panel 21 is adjacent to the air and the other surface is adjacent to the material having a refractive index of 1.4, the traveling direction of the optical signal in the light guide panel 21 The angle with the surface or the bottom surface, that is, the incident angle θ is greater than 70 degrees.

In this embodiment, the collimated light source 22 may be a laser, a vertical cavity laser (VCSEL) or a combination of a non-collimated light source and a secondary optical element; specifically, the secondary optical element It may be selected from the group consisting of a parabolic surface concentrating mirror, a compound parabolic concentrating mirror (CPC), a lens, a krypton, a Fresnel lens, and combinations thereof. As shown in FIG. 3A, the embodiment of the present invention uses a parabolic concentrator or CPC 221 to cooperate with the non-collimated light source 222 to provide a collimated optical signal; as shown in FIG. 3B, the embodiment of the present invention is used. The Fresnel lens 223 is coupled with the non-collimated light source 222 to provide a collimated optical signal; as shown in FIG. 3C, which illustrates the use of one (or more) lens 224 and non-collimated light source 222 in accordance with an embodiment of the present invention. Paired to provide a collimated optical signal. As shown in FIG. 3D, the embodiment of the present invention uses one (or more) Prism 225 to cooperate with the non-collimated light source 222 to provide collimated optical signals through the 稜鏡225; The 稜鏡225 can be disposed only between the first light guiding portion 214 and the collimated light source 22 or the non-collimated light source 222, or between the second light guiding portion 215 and the signal amplifier 23, or even Both are provided, and the 稜鏡225 can be fixed or rotatable.

Furthermore, the wavelength of the optical signal can be between 380 and 1400 nanometers (nm); in practical applications, it can be divided into a visible light segment (380-780 nm) and a near-infrared segment (780-1400 nm). Further, when the wavelength of the visible light segment is used, it is visible to the naked eye, and different wavelengths can be used to indicate the effective or inactive region to assist the user to understand the available region; when the wavelength of the near-infrared segment is used, it is invisible to the naked eye, suitable for Use in an under display or in an environment where the demand is not perceived by the user. In addition, a coating film (not shown) is formed on the surface of the light guiding panel 21 for visible light to pass through, and the remaining wavelengths of light are reflected in the light guiding panel 21.

In this embodiment, the signal amplifier 23 is adjacent to the second light guiding portion 215 for receiving the optical signal derived by the second light guiding portion 215 and amplifying the optical signal, and the signal amplifier 23 can be in the form of a mirror.

In this embodiment, the photosensitive element 24 is adjacent to the signal amplifier 23 for receiving the optical signal derived by the signal amplifier 23 and processing the optical signal into a fingerprint image, thereby achieving fingerprint identification. When the user presses the fingerprint sensing area 211 on the surface of the light guiding panel 21 with the finger A, the optical signal is destroyed by the total reflection in the light guiding panel 21, and the photosensitive element 24 can detect the waveform change of the optical signal, and Processed as a fingerprint image to achieve the purpose of fingerprint recognition.

In this embodiment, the photosensitive element 24 and the signal amplifier 23 may further comprise a lens, a prism film, an angular filter or a combination thereof. Referring to FIG. 4A to FIG. 4D, the lens 251, the ruthenium film 252, the angle filter 253, and the combination of the ruthenium film 252 and the angle filter 253 are respectively disposed on the photosensitive element 24 in the embodiment of the present invention.

The angle filter 253 shown in FIG. 4C is a vertical type grating filter. As shown in FIG. 5A, the angle filter 253 may also be a tilt type grating filter, and as shown in FIG. 4C and FIG. 5A. As shown, the angle filter 253 is a single layer structure formed by a plurality of first material films 254 spaced apart, or the angle filter 253 may be formed by a plurality of first material films 254 and a plurality of second material films 255. Single layer structure. In addition, as shown in FIG. 5B, the angle filter 253 may be a multilayer structure in which a plurality of first material films 254 and a plurality of second material films 255 are spaced apart, and a first material film 254 of a different layer in the multilayer structure. It is aligned, or, as shown in Fig. 5C, the first material films 254 of the different layers in the multilayer structure are staggered. Further, as shown in FIGS. 5D to 5F, the embodiment in which the combination of the angle filter 253 and the ruthenium film 252 in the fifth to fifth embodiments is combined with the photosensitive element 24 is shown.

The above embodiment provides internal total reflection in the light guide panel 21 by providing a collimated optical signal. In practical applications, the uncollimated light source 222 can be directly used to provide an uncollimated optical signal in the light guide panel 21. The high-order angle filter 253 is further disposed on the photosensitive element 24 side, and the purpose of fingerprint imaging can also be achieved.

In addition, as shown in FIG. 6A, the photosensitive element 24 of the optical fingerprint recognition system 20 of the embodiment of the present invention can be placed in parallel with respect to the light guide panel 21; as shown in FIG. 6B, the embodiment of the present invention provides The photosensitive element 24 of the optical fingerprint recognition system 20 may also be inclined with respect to the light guide panel 21, and the inclination angle α may be, for example, 10 degrees, 45 degrees, or 90 degrees.

The present invention is applied to a product integrated with the optical fingerprint identification system 20 and the display panel. As shown in FIG. 7, in the embodiment, the light guide panel 21 is disposed above a display panel 30, and the photosensitive element 24 is concealed in the display panel. In the practical application, the light guide panel 21 is attached to the display panel 30 by the application of the optical adhesive 216 or the dispensing method according to the design requirements. In order to easily achieve full surface fingerprint recognition, the light guide panel 21 is preferably used. It is a method of coating the optical glue on the entire bottom surface. Since the photosensitive element 24 of the present invention is not detected by the reflected light of the received fingerprint, it does not cause a problem of insufficient penetration, which makes the application more extensive.

In addition, the present invention can also combine the optical fingerprint recognition system 20 with the camera lens of the mobile phone. As shown in FIG. 8, in this embodiment, a polarization beam splitting prism (PBS) is disposed between the photosensitive element 24 and the signal amplifier 23. The spectroscope (BS) 41 can provide the optical signal derived from the signal amplifier 23 to the photosensitive element 24 for sensing imaging, and can also provide the optical signal transmitted by the lens module 40 to the photosensitive element 24 for sensing. Imaging, that is, the present invention can be shared with the camera lens of the mobile phone to reach the photosensitive element 24, so that the optical fingerprint recognition system 20 does not occupy too much structural space, so that the volume of the final product can be simplified.

In the above embodiment, the type, shape, number, and relative of the light guide panel 21 and its first light guiding portion 214 and second light guiding portion 215, the collimated light source 22 or the non-collimated light source 222, the signal amplifier 23, and the photosensitive element 24 are opposite. The positional relationship is only an example, and is not limited thereto, and any one of the spirits of the present invention does not depart from the scope of the present invention.

In summary, the optical fingerprint identification system disclosed in the present invention uses a light guide panel as a fingerprint sensing area for finger pressing, and provides a collimated optical signal, and is designed with a first light guiding portion and a first The two light guiding portions enable the optical signal to transmit the total total reflection effect in the light guiding panel, and then the signal is amplified, and finally the photosensitive element detects the waveform change thereof to obtain the fingerprint image. Compared with the conventional optical fingerprint identification system, the photosensitive element is detected by receiving the light reflected by the finger, and there is a problem of the transparency above the photosensitive element, so that the configuration of the fingerprint identification related component has its limitation; The optical fingerprint identification system disclosed by the invention is relatively easy to configure, in particular, when the optical fingerprint identification system is integrated with the display panel, the photosensitive element can be concealed on the back side of the display panel without affecting the lack of penetration and affecting the recognition rate. It will be beneficial to the design of the product to meet the consumer's aesthetic needs for the appearance of the product. The invention can also integrate the optical fingerprint identification system with the lens module. By adding a polarization splitting prism (PBS) or a beam splitter (BS), the photosensitive element can be shared, and the product structure can be simplified. Further, a regional or comprehensive fingerprint sensing area can be designed to allow the user to use the fingerprint recognition function more flexibly and conveniently.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Therefore, any changes or modifications of the features and spirits of the present invention should be included in the scope of the present invention.

10‧‧‧Optical fingerprint identification system

11‧‧‧Photosensitive element

12‧‧‧ pressure plate

121‧‧‧ board

13‧‧‧Light diffuser

131‧‧‧through hole

14‧‧‧Light source

20‧‧‧Optical fingerprint identification system

21‧‧‧Light guide panel

211‧‧‧Finger sensing area

212‧‧‧Into the light end

213‧‧‧Lighting end

214‧‧‧First Light Guide

215‧‧‧Second Light Guide

216‧‧‧Optical adhesive

22‧‧‧ Collimated light source

221‧‧‧Parabolic Condenser or CPC

222‧‧‧ Non-collimated light source

223‧‧ ‧Fresnel lens

224‧‧‧ lens

225‧‧‧稜鏡

23‧‧‧Signal Amplifier

24‧‧‧Photosensitive elements

251‧‧‧ lens

252‧‧‧稜鏡film

253‧‧‧Angle filter

254‧‧‧First material film

255‧‧‧Second material film

30‧‧‧ display panel

40‧‧‧Lens module

41‧‧‧Polarizing beam splitting prism or beam splitter

A‧‧‧ finger

Θ‧‧‧incidence angle

‧‧‧‧ tilt angle

Figure 1 is a cross-sectional view of an optical fingerprinting system provided by the prior art. 2 is a cross-sectional view of an optical fingerprint recognition system according to an embodiment of the present invention. 3A-3C are schematic diagrams showing the use of different secondary optical elements and non-collimated light sources in an optical fingerprint identification system according to an embodiment of the present invention. FIG. 3D is a schematic diagram of a combination of a 稜鏡 and a non-collimated light source in an optical fingerprint recognition system according to an embodiment of the present invention. 4A to 4D are schematic diagrams showing the use of a lens, a ruthenium film, an angle filter, and a combination of a ruthenium film and an angle filter in a photosensitive fingerprint element in an optical fingerprint recognition system according to an embodiment of the present invention. 5A-5C are schematic diagrams showing the use of different angle filters in the photosensitive element in the optical fingerprint identification system provided by the embodiment of the present invention. FIG. 5D to FIG. 5F are schematic diagrams showing the use of different angular wave devices and tantalum films in a photosensitive element in an optical fingerprint identification system according to an embodiment of the present invention. 6A and 6B are schematic views respectively showing photosensitive elements using different placement methods in the optical fingerprint identification system provided by the embodiments of the present invention. FIG. 7 is a schematic diagram of an optical fingerprint identification system and a display panel according to an embodiment of the present invention. FIG. 8 is a schematic diagram of a combination of an optical fingerprint recognition system and a camera lens of a mobile phone according to an embodiment of the present invention.

Claims (21)

An optical fingerprint identification system includes: a light guide panel having a fingerprint sensing area for pressing a finger, and the light guiding panel is respectively provided with a first light guiding portion and a light guiding end and a light emitting end respectively a second light guiding portion; a light source adjacent to the first light guiding portion and providing at least one optical signal, the optical signal being introduced into the light guiding panel via the first light guiding portion and passing through the entire light guiding panel The reflection effect is transmitted and then derived through the second light guiding portion; a signal amplifier adjacent to the second light guiding portion receives the optical signal derived by the second light guiding portion, and the optical signal is amplified and then derived; A photosensitive element is adjacent to the signal amplifier, receives the optical signal derived by the signal amplifier, and processes the optical signal into a fingerprint image. The optical fingerprint recognition system of claim 1, wherein the fingerprint sensing area is all or a partial area of the surface of the light guiding panel. The optical fingerprint identification system of claim 1, wherein the light guiding panel is disposed above a display panel. The optical fingerprint identification system of claim 3, wherein the light guide panel is attached to the display panel by coating optical glue or dispensing. The optical fingerprint recognition system of claim 1, wherein the light source is a collimated light source or a non-collimated light source. The optical fingerprinting system of claim 5, wherein the collimated light source is a laser, a vertical cavity surfaced laser (VCSEL) or a combination of a non-collimated light source and a secondary optical element. The optical fingerprint recognition system of claim 6, wherein the secondary optical component is selected from the group consisting of a parabolic surface concentrating mirror, a compound parabolic concentrating mirror (CPC), a lens, a cymbal, and a Fresnel lens. And their combinations. The optical fingerprint identification system of claim 1, wherein the optical signal has a wavelength of between 380 and 1400 nanometers (nm). The optical fingerprint identification system of claim 1, wherein an angle between the optical signal and a normal of the surface or a bottom surface of the light guide panel is required when the optical signal travels within the light guide panel Satisfying greater than arcsin(n ₀ /n ₂ ) and arcsin(n ₁ /n ₂ ); wherein n ₀ is a refractive index of the surface of the light guiding panel; n ₁ is a refractive index of the bottom surface of the light guiding panel; And n _{2 is} the refractive index of the light guide panel. The optical fingerprint identification system of claim 1, wherein the first light guiding portion, the second light guiding portion and the light guiding panel are integrated. The optical fingerprint recognition system of claim 1, wherein the first light guiding portion and the second light guiding portion are separately disposed with respect to the light guiding panel. The optical fingerprint identification system of claim 1, wherein the surface of the light guiding panel forms a coating film, the coating film is transparent to a visible light, and the remaining wavelengths of light are reflected. The optical fingerprint identification system of claim 1, wherein the first light guiding portion and the second light guiding portion are in the form of a mirror or an optical fiber. The optical fingerprint recognition system of claim 1, wherein the signal amplifier is in the form of a mirror. The optical fingerprint identification system of claim 1, wherein the photosensitive element and the signal amplifier further comprise a lens, a prism film, an angular filter, and a polarization splitting. Prism (PBS), beam splitter (BS), or a combination thereof. The optical fingerprint recognition system of claim 15, wherein the angle filter is a vertical or tilt type grating filter. The optical fingerprint identification system of claim 16, wherein the grating filter is a single layer structure formed by a plurality of first material film spacers. The optical fingerprint identification system of claim 16, wherein the grating filter is a single layer structure formed by a plurality of first material films and a plurality of second material films. The optical fingerprint identification system of claim 16, wherein the grating filter is a multi-layer structure composed of a plurality of first material films and a plurality of second material films, and the different layers of the multi-layer structure The first material films are aligned or staggered. The optical fingerprint recognition system of claim 1, wherein the photosensitive element is placed in parallel or obliquely with respect to the light guiding panel. The optical fingerprint identification system of claim 1, wherein the first light guiding portion and the light source, the second light guiding portion and the signal amplifier or the two places further comprise at least one 稜鏡 ( Prism), and the crucible is a fixed or rotatable crucible.