TW202138977A - Electronic device - Google Patents

Abstract

An electronic device including a fingerprint sensing module, a display panel and a middle frame is provided. The fingerprint sensing module is adapted to sense the sensing light beam reflected by a finger. The display panel is disposed on the fingerprint sensing module, and is adapted to provide an illuminating light beam to the finger to reflect the sensing light beam. The middle frame is disposed between the fingerprint sensing module and the display panel. The middle frame has a first surface, a second surface opposite to each other, and a light entrance. The first surface faces the display panel, the second surface faces the fingerprint sensing module. The sensing light beam passes through the light entrance to be transmitted to the fingerprint sensing module, wherein the first surface includes an annular groove recessed toward the second surface, and the annular groove has a distance from the light entrance.

Description

Electronic device

The present invention relates to an electronic device, and more particularly to an electronic device with a fingerprint sensing module.

In traditional electronic devices with ultra-thin fingerprint modules, when fingerprint signal sensing is performed, the structure of the middle frame easily reflects some light, causing these lights to enter the sensing module, so that these lights and fingerprint signals are simultaneously imaged. In this way, noise will appear in the sensed fingerprint signal. Therefore, how to avoid the reflection of light back to the sensing module due to the structure of the middle frame is a goal in this field.

The present invention provides an electronic device that can avoid reflecting stray light to a fingerprint sensing module, thereby preventing the fingerprint sensing module from sensing noise light signals and effectively improving the fingerprint sensing effect.

The invention provides an electronic device including a fingerprint sensing module, a display panel and a middle frame. The fingerprint sensing module is suitable for sensing the sensing beam reflected by the finger. The display panel is configured in the fingerprint sensing module, and is suitable for providing an illuminating beam to the finger to reflect the sensing beam. The middle frame is arranged between the fingerprint sensing module and the display panel. The middle frame has a first surface, a second surface and a light entrance port opposite to each other. The first side faces the display panel, and the second side faces the fingerprint sensing module. The sensing beam passes through the light entrance to be transmitted to the fingerprint sensing module, wherein the first surface includes an annular groove recessed toward the second surface, and the annular groove has a distance from the light entrance.

Based on the above, in the electronic device of the present invention, through the annular groove design, the middle frame can reduce the reflection of stray light to the fingerprint sensor module, thereby preventing the fingerprint sensor module from sensing the noise light signal and effectively improve Fingerprint sensing effect.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

Please refer to Figure 1. This embodiment provides an electronic device 10 including a fingerprint sensing module 50, a display panel 60, and a middle frame 100. The display panel 60 is adapted to provide an illumination beam L1 to the finger 20 to reflect the sensing beam L2, and the fingerprint sensing module 50 is disposed under the display panel 60 and is adapted to sense the sensing beam L2 reflected by the finger 20. In other words, the electronic device 10 of this embodiment is an under-screen fingerprint recognition device, such as a smart phone, a tablet computer, a notebook computer, or a touch-sensitive display device, etc. The invention is not limited to this. In this embodiment, the fingerprint sensing module 50 has an ultra-thin structure with a thickness of only about 300 microns, so it can be applied to a thin electronic device 10.

In this embodiment, the fingerprint sensing module 50 includes a circuit board 52, a photosensitive element 54 and an optical module 56. The circuit board 52 is used to carry the photosensitive element 54 and supply power. The circuit board 52 is, for example, a flexible circuit board, and the photosensitive element 54 is fixed on the circuit board 52 in an adhesive manner. For example, the fingerprint sensing module 50 may also include an adhesive layer connected to the bottom side of the photosensitive element 54 and the circuit board 52, but the invention is not limited to this. In addition, in some embodiments, the photosensitive element 54 may also be packaged to enhance the structural strength of the photosensitive element 54 on the circuit board 52 with packaging materials.

The photosensitive element 54 is disposed on the circuit board 52 and has a photosensitive surface. For example, the photosensitive element 54 includes a plurality of sensing units. The photosensitive element 54 is, for example, a complementary metal oxide semiconductor (CMOS) image sensor, and the sensing unit is a sensing pixel in these image sensor crystals. However, in other embodiments, the photosensitive element 54 may also be an image sensor such as a charge coupled device (CCD), and the invention does not limit the type of the photosensitive element 54 in the fingerprint sensor module 50. In some embodiments, a filter or a layer of filter material may be disposed on the photosensitive element 54 to filter out infrared light transmitted from the outside to the photosensitive element 54 to improve the sensing effect.

The optical module 56 is disposed on the photosensitive element 54 and is composed of at least one lens or other optical elements. For example, in this embodiment, the optical module 56 includes, for example, a combination of one or more optical lenses with refractive power, such as non-planar lenses such as biconcave lenses, biconvex lenses, meniscus lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses. Various combinations of lenses. In an embodiment, the optical module 56 may further include an array lens to improve the uniformity of the incident light transmission. The present invention does not limit the type and type of the optical module 56.

The display panel 60 is configured on the fingerprint sensing module 50. In this embodiment, the display panel 60 is, for example, an organic light-emitting diode (OLED) display panel. However, in other embodiments, the display panel 60 can also be a liquid crystal display panel or other suitable display panels, and the present invention is not limited to this.

Please refer to Figure 1 to Figure 3 at the same time. The middle frame 100 is disposed between the fingerprint sensor module 50 and the display panel 60 to limit or calibrate the position of the fingerprint sensor module 50 and to carry the display panel 60. The middle frame 100 has a first surface S1, a second surface S2 and a light entrance P opposite to each other. The first surface S1 faces the display panel 60, and the second surface S2 faces the fingerprint sensing module 50. Therefore, the sensing light beam L2 is transmitted toward the side of the display panel 60 through the light entrance P of the middle frame 100, and then is transmitted to the fingerprint sensing module 50. In this embodiment, the optical module 56 is located in the light entrance P, but the invention is not limited to this.

In this embodiment, the first surface S1 of the middle frame 100 includes an annular groove G recessed toward the second surface S2, and the annular groove G has a distance D from the light entrance P. Most of the first surface S1 and the second surface S2 are flat and horizontal surfaces, and a small portion has other structures, such as the annular groove G mentioned above. Since the annular groove G and the light entrance P have a distance D, when the stray light L3 is transmitted to the annular groove G, it will not be easily reflected to the fingerprint sensing module 50. In different embodiments, slopes with different slopes can be designed at the distance D to reduce the probability of the stray light L3 reflecting into the fingerprint sensing module 50. Therefore, when the stray light L3 is transmitted to the middle frame 100, the stray light L3 will not be directly or indirectly reflected and transmitted to the fingerprint sensing module 50 due to the transmission to the surface of the middle frame 100. In this way, the middle frame 100 designed in this embodiment can avoid reflecting the stray light L3 to the fingerprint sensing module 50, thereby preventing the fingerprint sensing module 50 from sensing noise light signals and effectively improving the fingerprint sensing effect. In some embodiments, the electronic device 10 may further include a black ring member disposed in the ring groove G to absorb stray light L3 and increase the support when the finger 20 is pressed, but the present invention is not limited to this.

In detail, the first surface S1 of the middle frame 100 has a first annular inclined surface S11 located between the annular groove G and the light entrance P. In this embodiment, the first annular slope S11 and the horizontal reference plane have a first included angle B1, and the first included angle B1 is greater than 30 degrees. In this way, the stray light L3 near the center (that is, the light transmitted between the annular groove G and the light entrance P) can be reflected away from the light entrance P by the first annular inclined surface S11, thereby avoiding the use of It is reflected and transferred from the middle frame 100 to the fingerprint sensing module 50.

In this embodiment, the first surface S1 of the middle frame 100 further has a second annular inclined surface S12, which is located between the annular groove G and the first annular inclined surface S11. In other words, a part of the annular groove G is formed by the second annular inclined surface S12. In this embodiment, the second annular inclined surface S1 and the horizontal reference plane have a second included angle B2, and the second included angle B2 is greater than or equal to 10 degrees. In this embodiment, the second annular inclined surface S12 is directly adjacent to the first annular inclined surface S11, but the present invention is not limited to this. In this way, the sensing light beam L2 transmitted into the annular groove G can be transmitted in a direction away from the light entrance P through the second annular inclined surface S12, thereby preventing the stray light L3 from being caused by the structure surface of the middle frame 100 The reflection enters the fingerprint sensing module 50, thereby preventing the fingerprint sensing module 50 from sensing noise light signals.

In summary, in the electronic device of the present invention, through the annular groove design, the middle frame can reduce the reflection of stray light to the fingerprint sensor module, thereby preventing the fingerprint sensor module from sensing noisy light signals. Effectively enhance the fingerprint sensing effect.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be subject to those defined by the attached patent application scope.

10: Electronic device 20: finger 50: Fingerprint sensor module 52: circuit board 54: photosensitive element 56: Optical module 60: display panel 100: middle frame B1: The first angle B2: The second included angle D: distance G: ring groove L1: Illumination beam L2: Sensing beam L3: Stray light P: Light entrance S1: First side S11: The first circular slope S12: The second annular slope S2: Second side

FIG. 1 is a schematic cross-sectional view of an electronic device according to an embodiment of the invention. FIG. 2 is a schematic cross-sectional view of the middle frame of the electronic device of FIG. 1. FIG. 3 is an enlarged schematic diagram of area A in the electronic device of FIG. 1.

10: Electronic device

20: finger

50: Fingerprint sensor module

52: circuit board

54: photosensitive element

56: Optical module

60: display panel

100: middle frame

G: ring groove

L1: Illumination beam

L2: Sensing beam

P: Light entrance

Claims (10)

An electronic device, including: The fingerprint sensing module is suitable for sensing the sensing beam reflected by the finger; The display panel is configured on the fingerprint sensing module and is suitable for providing an illuminating light beam to the finger to reflect the sensing light beam; and The middle frame is disposed between the fingerprint sensing module and the display panel, the middle frame has a first surface, a second surface and a light entrance that are opposite to each other, and the first surface faces the display panel, The second surface faces the fingerprint sensing module, and the sensing beam passes through the light entrance to be transmitted to the fingerprint sensing module, wherein the first surface includes facing the second surface A concave annular groove, the annular groove has a distance from the light entrance. The electronic device according to claim 1, wherein the first surface has a first annular inclined surface located between the annular groove and the light entrance. The electronic device according to claim 2, wherein there is a first included angle between the first annular slope and the horizontal reference plane, and the angle of the first included angle is greater than 30 degrees. The electronic device according to claim 2, wherein the first surface has a second annular inclined surface located between the annular groove and the first annular inclined surface. The electronic device according to claim 4, wherein there is a second included angle between the second annular inclined surface and the horizontal reference plane, and the angle of the second included angle is greater than or equal to 10 degrees. The electronic device according to claim 4, wherein the second annular slope is directly adjacent to the first annular slope. The electronic device according to claim 4, wherein a part of the annular groove is formed by the second annular inclined surface. The electronic device according to claim 1, wherein the fingerprint sensing module includes a circuit board, a photosensitive element, and an optical module. The electronic device according to claim 8, wherein the optical module is located in the light entrance. The electronic device according to claim 1, further comprising: The black ring is arranged in the ring groove.

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