TW201930940A - Optical sensing protection shell with which a smart device may be provided with the functions of full-screen fingerprint sensing and convenient maintenance - Google Patents

Abstract

The invention provides an optical sensing protection shell, comprising an upper casing, a lower casing and a light guide plate, wherein the three can cover the smart device, the upper and lower casings are fastened and combined with each other, and the light guide plate is arranged on the upper casing. a fingerprint sensing area is provided for the finger to be pressed, and a first reflecting portion and a second reflecting portion are respectively disposed on the two sides of the light guiding plate; the light source, a signal amplifier and a photosensitive element are disposed on the lower casing The optical signal provided by the light source is introduced into the light guide plate through the first reflection portion, and is transmitted by the total reflection effect in the light guide plate, and then is transmitted to the photosensitive element through the second reflection portion and the signal amplifier, and the photosensitive element processes the optical signal into a fingerprint image. Transfer to the smart device. The smart device that does not have the fingerprint detection function can have the function of full-screen fingerprint sensing after being equipped with the optical sensing protective cover of the present invention, and is convenient for maintenance, so the invention has both practicality and beauty.

Description

Optical sensing protective case

The present invention relates to a protective case, and more particularly to an optically sensed protective case.

With the evolution of technology, more and more confidential information and personal data are stored in smart devices, and how to ensure that information is not outflow is a very important security issue, including how to passwords such as smart phones and computers. In addition to digital passwords and graphic passwords, biometric identification is prevalent, including fingerprints, irises, facial images, etc. Among them, fingerprint identification uses the unique fingerprint information on the human finger to identify it, in terms of safety and convenience. The advantages of the aspect are widely used.

Today's smart phones almost all add fingerprint recognition, which can provide fingerprint encryption and fingerprint unlocking. However, current smart phones are designed to set a fingerprint sensing area on the phone case, such as the Home button and the fingerprint sensing area. However, this area is too small, only one fingerprint can be sensed at a time. If the photosensitive element inside the fingerprint sensing area is damaged, it is necessary to send the whole mobile phone for repair, which is time-consuming and laborious and expensive, so if the fingerprint detection function is available Adding to the outside of the smart device, it is easy to repair and provide a wide range of fingerprint detection areas, which will be a major advancement.

Therefore, the present invention proposes a protective housing for optical sensing, which effectively solves the above problems, and the specific architecture and its implementation will be described in detail below:

The main object of the present invention is to provide an optical sensing protective cover, which comprises a light source, a light guide plate and a photosensitive element respectively disposed on the upper and lower casings of the protective casing, and the smart device is disposed between the upper and lower casings. The smart device can provide full-screen fingerprint detection, and is not limited to the specific fingerprint identification area of the smart device itself.

Another object of the present invention is to provide an optical sensing protective case, wherein the upper and lower casings are assembled conveniently. When the photosensitive element or the light source is damaged, the lower casing can be directly removed for replacement, and the smart device can be omitted, thereby saving The time and cost of repairs.

To achieve the above objective, the present invention provides an optical sensing protective case including an upper casing and a lower casing. The smart device can be installed between the upper and lower casings, and the upper and lower casings are interlocked with each other. The light guide plate is transparent and disposed on the upper casing. The light guide plate is provided with a fingerprint sensing area for pressing a finger, and a first reflection is respectively arranged on both sides of the light guide plate. And a second reflecting portion; a light source is disposed on the lower casing to provide at least one optical signal, the optical signal is introduced into the light guide plate through the first reflecting portion, and an internal total reflection effect is adopted in the light guiding plate Transmitting, and then deriving through the second reflecting portion; a signal amplifier is located on the lower casing and below the second reflecting portion, receiving the optical signal derived by the second reflecting portion, and amplifying the optical signal and then deriving And a photosensitive element disposed on the lower casing and connected to the smart device signal, receiving the optical signal derived by the signal amplifier, and processing the optical signal into a fingerprint image for transmission to the smart device.

According to an embodiment of the invention, an upper surface of one of the light guide plates is covered by the upper casing, and an uncovered area of the upper surface is the fingerprint sensing area.

According to an embodiment of the invention, the light guide plate is disposed on a display screen of one of the smart devices.

According to an embodiment of the present invention, the lower edge of the upper casing is provided with at least one first connecting portion, and the upper edge of the lower casing is provided with at least one second connecting portion, the first connecting portion is connected to the second connecting portion The portions are fastened to join the upper and lower casings together.

According to an embodiment of the invention, the photosensitive element is connected to a slot of the smart device via a signal line to transmit the optical signal to the smart device.

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

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 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 invention, the first reflecting portion, the second reflecting portion and the light guiding plate are integrally formed.

According to an embodiment of the invention, the first reflecting portion and the second reflecting portion are reflective elements independent of the light guide plate.

According to an embodiment of the invention, the surface of the light guide plate forms a coating film, and the coating film is transparent to a visible light, and the remaining wavelengths of light are reflected.

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 splitting prism (PBS), and a beam splitter ( BS) or a combination thereof.

According to an embodiment of the invention, the angle filter is 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 spaces, or a single layer structure formed by a plurality of first material films and a plurality of second material films.

According to an embodiment of the invention, the fingerprint sensing area further includes a starting area, and the finger is pressed in the starting area to activate the display screen of the smart device, so as to avoid the user unintentionally touching but the smart device is unlocked. The situation occurs, and the division of the startup area and the non-activation area can be determined by the screen touch function.

According to an embodiment of the invention, the smart device can be a smart phone, a tablet or a notebook.

The invention provides an optical sensing protective shell, which is applied to a smart device, and provides a fingerprint sensing function by providing a smart device that does not have a fingerprint sensing function by optically sensing a position of a finger pressing and converting into a fingerprint image.

Please refer to FIG. 1 and FIG. 2 simultaneously, which are respectively a perspective view and an exploded view of an embodiment of a smart device for optically sensing the protective case of the present invention. As shown in the figure, the optical sensing protective case 10 of the present invention is shown. The upper housing 12 and the lower housing 14 are disposed. The smart device 30 can be disposed between the upper housing 12 and the lower housing 14. The lower edge of the upper housing 12 and the upper edge of the lower housing 14 are interlocked with each other. The upper casing 12 and the lower casing 14 can be integrated into one body; a light guide plate 16 is disposed on the upper casing 12, which is transparent, and is close to the display screen of the smart device 30 with respect to the smart device 30. On one side, the screen displayed on the display screen can be seen through the transparent light guide plate 16. The light guide plate 16 is provided with a fingerprint sensing area for the finger to press, and the first side of the light guide plate 16 is respectively provided with a first The light-receiving portion 162 and the second light-receiving portion 164 are disposed on the lower casing 14 and are respectively disposed at the two ends of the lower casing 14 at the front and rear ends. At both ends, the light source 18 provides at least one optical signal, and the optical signal is guided by the first reflecting portion 162 The light guide plate 16 is transmitted by the total internal reflection (TIR) effect in the light guide plate 16, and then is sent to the signal amplifier 19 via the second reflection portion 164. The signal amplifier 19 is disposed on the lower casing 14, The second reflecting portion 164 is in the form of a mirror surface for amplifying the waveform of the optical signal to enhance the signal sharpness; the photosensitive element 20 is connected to the smart device 30 by a wired or wireless signal, and the photosensitive element 20 receives the signal. After the optical signal derived by the amplifier 19, the optical signal is processed into a fingerprint image and transmitted to the smart device 30, which can be a smart phone, a tablet computer or a notebook computer.

In an embodiment of the invention, source 18 is a collimated source or a non-collimated source. The collimated light source is a combination of a laser, a vertical cavity laser (VCSEL) or a non-collimated light source and a secondary optical element. 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, a Fresnel lens, and combinations thereof. The photosensitive element 20 can be a charge-coupled device (CCD) or a complementary metal oxide semiconductor active pixel sensor.

Please refer to FIG. 3, which is a cross-sectional view showing an embodiment of the optical sensing protective case of the present invention. In this embodiment, the upper surface of the light guide plate 16 is covered by the upper casing 12, and the area where the upper surface is not covered by the upper casing 12 is a fingerprint sensing area, which can be pressed by a user with a finger. In the embodiment of the present invention, the first reflecting portion 162, the second reflecting portion 164 and the light guiding plate 16 are integrally formed or separately, and the first reflecting portion 162 and the second reflecting portion 164 are independent of the guide. A reflective element outside the light panel 16, such as a mirror. In this embodiment, the photosensitive element 20 is coupled to a slot 32 of the smart device 30 via a signal line 34 for transmitting signals to the smart device 30.

The upper edge of the upper casing 12 is provided with at least one first connecting portion 122, and the upper edge of the lower casing 14 is provided with at least one second connecting portion 142. The first connecting portion 122 is fastened to the second connecting portion 142. The upper and lower casings 12 and 14 are joined together. In particular, the first connecting portion 122 may be a full circle around the lower edge of the upper casing 12, or may be disposed only on the left and right, up and down or any position. Similarly, the second connecting portion 142 may be a full circle around the upper edge of the lower casing 14, or may be disposed only at the left and right, upper and lower, or any corresponding position of the first connecting portion 122, so that the first connecting portion 122 and the first connecting portion 122 The two connecting portions 142 are engageable with each other.

As is clear from FIG. 3, the light source 18 is disposed below the first reflecting portion 162, and the optical signal is incident on the first reflecting portion 162 upward; the first reflecting portion 162 totally reflects the optical signal. The light guide plate 16 is transmitted to the second reflection portion 164, and directly below the second reflection portion 164 is a signal amplifier 19, and the optical signal is reflected to the photosensitive element 20 via the second reflection portion 164 and the signal amplifier 19, which is the light in the present invention. The transmission path. When the user presses the surface of the light guide plate 16 with a finger, the optical signal is destroyed by the total reflection in the light guide plate 16. The photosensitive element 20 can detect the waveform change of the optical signal and process it into a fingerprint image to reach the fingerprint. The purpose of the detection.

Among them, the wavelength of the optical signal is between 380 and 1400 nanometers (nm). In practical applications, it can be divided into the visible light segment (380-780 nm) and the near-infrared segment (780-1400 nm).

The surface of the light guide plate 16 forms a coating film, the coating film can be penetrated by a visible light, and the light of the remaining wavelength band is reflected, so that the user can see the screen of the display screen, but the optical signal is still transmitted in the total reflection manner in the light guide plate 16. .

In addition, since the optical sensing protection cover of the present invention provides full-screen fingerprint detection, the entire light guide plate 16 can be a fingerprint sensing area for detecting a user's fingerprint. Therefore, in order to avoid the user simply taking the smart device in the hand In the embodiment of the present invention, a booting area can be set on the light guide plate 16 (not shown), but it is not used in the above, but the finger is pressed on the light guide plate 16 to unlock and open the display screen. The position and area of the activation area can be determined by the touch function of the screen. The display screen is only turned on when the finger is pressed in the activation area, and the activation area can be set at a position that is less accessible when the user holds the smart device. , for example, the middle area.

4A and 4B are schematic views showing an embodiment of different fastening modes of the upper and lower casings of the optical sensing protective case of the present invention. In FIG. 4A, the first connecting portion 122 of the upper casing 12 and the second connecting portion 142 of the lower casing 14 are barbed and can be fastened to each other; in FIG. 4B, the second connecting portion of the lower casing 14 The first connecting portion 122 of the upper casing 12 is convex, and the first connecting portion 122 can be engaged in the second connecting portion 142 to be engaged. However, the second embodiment is not limited by the present invention, and other fastening methods should be included in the present invention as long as the upper and lower casings 12, 14 can be combined.

In the embodiment of the present invention, the light-receiving element 20 and the signal amplifier 19 further comprise a light-transmitting component, such as a lens, a prism film, an angular filter (Angular filter), a polarization beam splitting prism (PBS), A beam splitter (BS) or a combination thereof, FIG. 5A is a schematic view showing an embodiment in which a lens 22 is disposed on the photosensitive member 20, and FIG. 5B is a schematic view showing an embodiment in which a film 22 is disposed on the photosensitive member 20. FIG. A schematic diagram of an embodiment in which an angle filter 26 is disposed on the photosensitive element 20 is shown in FIG. 5D as an embodiment in which a combination of a tantalum film 24 and an angle filter 26 is disposed on the photosensitive element 20.

The angle filter 26 shown in Fig. 5C is a vertical type grating filter, but it may be a tilt type grating filter (not shown). In addition, the grating filter may be a single layer structure composed of a plurality of first material film spaces, or a single layer structure composed of a plurality of first material films and a plurality of second material films. If the light source is a non-collimated light source, the uncollimated optical signal is transmitted in the light guide plate, and then the high-order angle filter is arranged on the photosensitive element, and the purpose of fingerprint imaging can also be achieved.

In summary, the optical sensing protection cover provided by the present invention has a light guide plate disposed on the upper casing of the protective casing, and the light source and the photosensitive element are disposed at both ends of the lower casing of the protective casing, and the upper and lower casings are provided. After the bodies are combined, the smart device is installed between the upper and lower casings, and the transparent light guide plate allows the user to still see the screen display on the smart device, but at the same time, the light guide plate provides a full-screen fingerprint. The detection function allows the photosensitive element to obtain an optical signal and convert it into a fingerprint image by pressing the finger on any position exposed on the light guide plate. Thus, the fingerprint detection function is not provided or the full-screen fingerprint identification is not provided. The functional smart device can directly have the function of full-screen fingerprint detection after being installed with the optical sensing protective cover of the present invention. In addition, if the light source or the photosensitive element is damaged, the lower case can be directly replaced, and the smart device is not required to be disassembled and repaired, thereby greatly saving maintenance costs.

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 sensing protective case

12‧‧‧Upper casing

122‧‧‧First connection

14‧‧‧ Lower case

142‧‧‧Second connection

16‧‧‧Light guide

162‧‧‧First reflection

164‧‧‧second reflection

18‧‧‧Light source

19‧‧‧Signal Amplifier

20‧‧‧Photosensitive elements

22‧‧‧ lens

24‧‧‧稜鏡film

26‧‧‧Angle filter

30‧‧‧Smart device

32‧‧‧Slots

34‧‧‧Signal line

Fig. 1 is a perspective view showing an embodiment of the optical sensing housing of the present invention with a smart device. Figure 2 is an exploded view of an embodiment of Figure 1. Figure 3 is a cross-sectional view showing an embodiment of the optical sensing housing of the present invention with a smart device. 4A and 4B are schematic views showing an embodiment of different fastening modes of the upper and lower casings of the optical sensing protective case of the present invention. FIG. 5A is a schematic view showing an embodiment in which a lens is disposed on a photosensitive element in the protective housing of the optical sensing of the present invention. FIG. 5B is a schematic view showing an embodiment of a protective film of the optical sensing of the present invention in which a film is disposed on the photosensitive member. FIG. 5C is a schematic view showing an embodiment in which an angle filter is disposed on the photosensitive element in the protective housing of the optical sensing of the present invention. FIG. 5D is a schematic view showing an embodiment of a protective film of the optical sensing of the present invention in which a thin film and an angle filter are disposed on the photosensitive element.

Claims (18)

An optical sensing protective case is applied to a smart device, comprising: an upper casing and a lower casing, the smart device being installable between the upper and lower casings, the upper and lower casings The light guide plate is transparent, and is disposed on the upper casing. The light guide plate is provided with a fingerprint sensing area for pressing a finger, and the two sides of the light guide plate are respectively provided with a first a light-emitting portion is disposed on the lower casing to provide at least one optical signal, and the optical signal is introduced into the light guide plate through the first reflective portion, and passes through the entire light guide plate The reflection effect is transmitted and then derived through the second reflection portion; a signal amplifier is located on the lower casing and below the second reflection portion, receives the optical signal derived by the second reflection portion, and amplifies the optical signal And a light-sensing component is disposed on the lower casing and connected to the smart device signal to receive the optical signal derived by the signal amplifier, and the optical signal is processed into a fingerprint image and transmitted to the smart device. The optically sensed protective case of claim 1, wherein an upper surface of one of the light guide plates is covered by the upper case, and an uncovered area of the upper surface is the fingerprint sensing area. The optically sensed protective case of claim 1, wherein the light guide plate is disposed on a display screen of one of the smart devices. The optically sensed protective case of claim 1, wherein the lower edge of the upper casing is provided with at least one first connecting portion, and the upper edge of the lower casing is provided with at least one second connecting portion, the first The connecting portion is fastened to the second connecting portion to join the upper and lower housings together. The optically sensed protective case of claim 1, wherein the photosensitive element is connected to a slot of the smart device via a signal line to transmit the optical signal to the smart device. The optically sensed protective case of claim 1, wherein the light source is a collimated light source or a non-collimated light source. The optically sensed protective case of claim 6, 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 optically sensed protective case of claim 7, wherein the secondary optical element is selected from the group consisting of a parabolic surface concentrating mirror, a compound parabolic concentrating mirror (CPC), a lens, a krypton, and a Fresnel lens. And their combinations. The optically sensed protective case of claim 1, wherein the optical signal has a wavelength of between 380 and 1400 nanometers (nm). The optically sensed protective case of claim 1, wherein the first reflecting portion, the second reflecting portion and the light guiding plate are integrally formed. The optically sensed protective case of claim 1, wherein the first reflective portion and the second reflective portion are reflective elements that are independent of the light guide plate. The optically sensed protective case of claim 1, wherein the surface of the light guide plate forms a coating film, the coating film is transparent to a visible light, and the remaining wavelengths of light are reflected. The optically sensed protective case 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 optically sensed protective case of claim 13, wherein the angular filter is a vertical or tilt type grating filter. The optically sensed protective case of claim 14, wherein the grating filter is a single layer structure formed by a plurality of first material film spacers. The optically sensed protective case of claim 14, wherein the grating filter is a single layer structure formed by a plurality of first material films and a plurality of second material films spaced apart. The optically sensed protective case of claim 1, wherein the fingerprint sensing area further comprises a starting area, the finger is pressed in the starting area to activate the display screen of the smart device, and the position of the starting area is The size of the area can be determined by the touch function of the screen. The optically sensed protective case of claim 1, wherein the smart device is a smart phone, a tablet or a notebook.