Electronic Devices

Abstract

The present invention discloses an electronic device, which comprises a cover plate, a light control panel, an optical fingerprint sensor and a first light source. The first light source is located on the same side of the cover plate, so that the first light source used for fingerprint sensing provides light with a half-decay angle between ±15°.

Description

Technical Field

[0001] The invention relates to an electronic device, in particular to an electronic device comprising a collimated light source. Background Art

[0002] Generally speaking, fingerprint recognition can be applied to identity recognition. Therefore, with the development of electronic device technology, fingerprint recognition functions have been integrated into various electronic devices and widely used. However, in the current display panel with embedded fingerprint recognition design, the recognition element is more susceptible to stray light interference, resulting in poor fingerprint recognition effect. Therefore, the industry still needs to continue to study methods to improve the accuracy of fingerprint recognition. Summary of the invention

[0003] In view of this, it is necessary to propose an electronic device and a manufacturing method thereof to solve the technical problems encountered by existing flexible electronic devices. One of the purposes of the present invention is to provide an electronic device with a fingerprint recognition function and a method for improving the interference of stray light when the electronic device receives fingerprint data, wherein the first light source used for fingerprint sensing is used to provide light with collimated light.

[0004] According to an embodiment of the present invention, an electronic device is provided, comprising a cover plate, a light control panel, an optical fingerprint sensor, and a first light source. The first light source is located on the same side of the cover plate, so that the first light source used for fingerprint sensing provides light with a half-decay angle between ±15°.

[0005] The embodiment of the present invention also provides another electronic device, including a cover plate, a backlight element, a light control panel, an optical adjustment structure, and an optical fingerprint sensor. The light control panel is located between the cover plate and the backlight element. The optical adjustment structure is located in the light control panel. The optical fingerprint sensor is located between the backlight element and the cover plate. The backlight element provides light for fingerprint sensing, and the light passes through the optical adjustment structure.

[0006] An embodiment of the present invention provides another electronic device, comprising a cover plate, a light control panel and a first light source. The light control panel and the first light source are located on the same side of the cover plate, and the first light source provides light with a half decay angle between ±15°. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 FIG. 1 is a schematic structural diagram of an electronic device according to a first embodiment of the present invention, and shows the structure of each component in a cross-sectional view.

[0008] Figure 2 FIG. 1 is a schematic diagram showing switch control of a first light source and a second light source of an electronic device according to a first embodiment of the present invention.

[0009] Figure 3FIG. 1 is a diagram showing the relationship between the relative intensity of light and the angle in the electronic device according to various embodiments of the present invention, which is used to define the half-decay angle used in the present invention.

[0010] Figure 4A FIG. 1 is a schematic diagram showing an electronic device in a display mode according to a second embodiment of the present invention.

[0011] Figure 4B FIG. 1 is a schematic diagram showing an electronic device in a fingerprint sensing mode according to a second embodiment of the present invention.

[0012] Figure 5 FIG. 1 is a schematic diagram showing switch control of a first light source and a second light source of an electronic device according to a second embodiment of the present invention.

[0013] Fig. 6A FIG. 1 is a schematic diagram showing an electronic device in a display mode according to a third embodiment of the present invention.

[0014] Figure 6B The electronic device according to the third embodiment of the present invention is shown to be in a fingerprint sensing mode.

[0015] Figure 7 FIG. 1 is a schematic diagram showing switch control of a first light source and a polymer dispersed liquid crystal layer of an electronic device according to a third embodiment of the present invention.

[0016] Figure 8 FIG. 4 is a schematic structural diagram of an electronic device according to a fourth embodiment of the present invention.

[0017] Fig. 9 FIG. 5 is a schematic structural diagram of an electronic device according to a fifth embodiment of the present invention.

[0018] Fig.10 FIG. 4 is a schematic structural diagram of an electronic device according to a sixth embodiment of the present invention.

[0019] Fig.11 Schematic diagrams of fingerprint sensing modes of electronic devices according to various embodiments of the present invention are shown.

[0020] Explanation of the reference numerals: 1-electronic device; 2-electronic device; 3-electronic device; 4-electronic device; 5-electronic device; 6-electronic device; 110-cover; 110a-surface; 120-color filter layer; 130-optical fingerprint sensor; 140-transistor array; 141-light control panel; 150-optical structure layer; 160-diffusion layer; 161-light transmittance adjustment layer; 170-light guide plate; 172-optical adjustment structure; 180-first light source; 181-light; 190-second light source; 191-light; CPX1-composite pixel; CPX13-composite pixel; CPX14-composite pixel; CPX2-composite pixel; DA-detection area; DL-detection line; DO-detection object; DU-unit detection block; FPS-fingerprint sensor; LX-pixel; θ-angle. DETAILED DESCRIPTION

[0021] The content of the present invention is described in detail below in conjunction with specific embodiments and drawings. In order to make the content of the present invention clearer and easier to understand, the following drawings may be simplified schematic diagrams, and the elements therein may not be drawn to scale. Moreover, the number and size of each element in the drawings are only for illustration and are not intended to limit the scope of the present invention.

[0022] Certain words are used throughout the specification and the appended claims to refer to specific elements. It should be understood by those skilled in the art that electronic equipment manufacturers may refer to the same elements by different names, and it is not intended to distinguish between elements that have the same function but different names. When the terms "comprises", "includes" and / or "having" are used in this specification, they specify the presence of the features, regions, steps, operations and / or elements, but do not exclude the presence or addition of one or more other features, regions, steps, operations, elements and / or combinations thereof.

[0023] When an element, such as a layer or region, is referred to as being "on" or extending "on" another element (or variations thereof), it may be directly on or directly extending to the other element, or there may be intervening elements between the two. On the other hand, when an element is referred to as being "directly on" another element (or variations thereof) or extending "directly" "on" another element, there are no intervening elements between the two. Also, when an element is referred to as being "coupled" to another element (or variations thereof), it may be directly connected to the other element or indirectly connected (e.g., electrically connected) to the other element through one or more elements.

[0024] It should be noted that the technical solutions provided in the following different embodiments can be replaced, combined or mixed with each other to form another embodiment without violating the spirit of the present invention.

[0025] Figure 1The electronic device 1 of the first embodiment of the present invention comprises a cover plate 110, an optical fingerprint sensor 130, a light control panel 141 and a first light source 180. In some embodiments, the electronic device 1 may further selectively comprise a color filter layer 120, a transistor array 140, a diffusing layer 160, a light guide plate 170 or a second light source 190, wherein the above components are all arranged relative to the detection object DO (e.g., a finger). That is, when the electronic device 1 is used to detect the detection object DO, the detection object DO is in a detection area DA ( Figure 1 The detection line DL is used to indicate that the area above the detection line DL is the detection area), and the components of the electronic device 1 are located on the same side of the detection line DL, that is, the side opposite to the detection area DA. The detection line DL can be an extension line of the upper surface of the cover 110 (the surface adjacent to the detection object DO).

[0026] The electronic device 1 may include a display device, an antenna device, a sensing device or a splicing device, but is not limited thereto. The electronic device may be a bendable or flexible electronic device. The electronic device 1 may, for example, include a liquid crystal or a light emitting diode; the light emitting diode may, for example, include an organic light emitting diode (OLED), a sub-millimeter light emitting diode (mini LED), a micro LED or a quantum dot (QD) light emitting diode (which may be, for example, QLED, QDLED), fluorescence, phosphorescence or other suitable materials and the materials may be arranged and combined in any manner, but is not limited thereto. The antenna device may, for example, be a liquid crystal antenna, but is not limited thereto. The splicing device may, for example, be a display splicing device or an antenna splicing device, but is not limited thereto. It should be noted that the electronic device 1 may be any arrangement or combination of the aforementioned, but is not limited thereto. The following text will use a display device as an electronic device or a splicing device to illustrate the content of the present invention, but the present invention is not limited thereto.

[0027] In detail, the optical fingerprint sensor 130, the color filter layer 120, the transistor array 140 and the first light source 180 can all be located on the same side of the cover plate 110 opposite to the detection object DO. For example, the optical fingerprint sensor 130 can be located between the transistor array 140 and the cover plate 110, but it is not limited thereto. The relative positions of the color filter layer 120 and the optical fingerprint sensor 130 can also be interchanged. In the electronic device 1 of the first embodiment, the first light source 180 and the second light source 190 can be independently controlled. The first light source 180 can be a collimated beam, and the light 181 emitted can be emitted at substantially the same angle. The second light source 190 can be a non-collimated light, such as a side-entry backlight, and the light emitted is not necessarily emitted at the same angle. In the first embodiment of the present invention, the first light source 180 can be disposed adjacent to the cover plate 110, for example, closer to the cover plate 110 than the second light source 190, the diffusion layer 160 or the light guide plate 170. The light 181 of the first light source 180 may have an inclined incident light angle θ with respect to the cover plate 110. The first light source 180 or the second light source 190 may be located at the same side of the detection line DL.

[0028] The electronic device 1 of the first embodiment may be any device that generates light, such as a device that can generate light to display an image or picture. For example, the electronic device 1 of this embodiment may be a display, such as a liquid crystal display, an organic light emitting display, a light emitting diode display, a quantum dot material display, or other suitable display. The electronic device 1 of this embodiment further has a built-in sensor that can be used to sense fingerprint data, so that the electronic device 1 has a fingerprint recognition function, such as an optical fingerprint sensor 130 and a first light source 180, but the present invention is not limited thereto.

[0029] Please refer to Figure 1 , the cover 110 can be located at the top layer of the electronic device 1 of the first embodiment. The cover 110 can be a transparent glass layer, but the present invention is not limited thereto. The two ends of the cover 110 can also be designed to be arc-shaped or inclined to assist in collecting or adjusting the light 181 emitted by the first light source 180. On the one hand, the cover 110 can be located at the top layer of the electronic device 1, thereby serving as a protective layer to reduce the probability of the electronic device 1 being affected or damaged by the external environment. The surface of the user's finger (i.e., the detection object DO) is a fingerprint pattern composed of ridges and fingerprints (not shown in the figure). When the fingerprint pattern contacts or is adjacent to the surface of the cover 110, the electronic device 1 enters the fingerprint sensing mode. The ridges and fingerprints will produce different reflection effects on the light. These differences help to convert into peak-ridge signals that can be used for identification, that is, the user's identity can be identified.

[0030] The optical fingerprint sensor 130 may be located below the color filter layer 120, and the color filter layer 120 may be located below the cover plate 110 and protected by the cover plate 110. The color filter layer 120 may include a plurality of color filters, and may have color filters of different colors. The transistor array 140 may be located below the color filter layer 120, and the transistor array 140 may include a plurality of thin film transistors (not shown), and a liquid crystal layer (not shown) may be included between the transistor array 140 and the color filter layer 120, but the present invention is not limited thereto. The color filter layer 120 and the transistor array 140 may be collectively referred to as a light control panel 141, which is used to generate light to display a predetermined image or picture, and the light control panel 141 may include liquid crystal or electronic paper. The color filter layer 120 may be set corresponding to the transistor array 140. The switch of the thin film transistor can regulate the steering of the liquid crystal molecules in the liquid crystal layer. The liquid crystal material in the liquid crystal layer may include various suitable liquid crystal materials such as nematic liquid crystal, smectic liquid crystal, cholesteric liquid crystal, etc., but the present invention is not limited thereto.

[0031] The optical structure layer 150 may be located below the transistor array 140 and may include a brightness enhancement film (BEF), an advanced structured optical composite (ASOC), a blue light transmitting mirror (BLT), or any combination thereof, but the present invention is not limited thereto. The optical structure layer 150 may help adjust the optical properties of the electronic device 1, such as the effect of concentrating light, but the present invention is not limited thereto.

[0032] The second light source 190 can be, for example, an edge-entry backlight source, which can emit light 191 and enter the light guide plate 170 from one side of the light guide plate 170, which helps the light 191 to be transmitted to the diffusion layer 160. The diffusion layer 160 can be located above the light guide plate 170, which helps to adjust the angle at which the light 191 leaves the diffusion layer 160.

[0033] Figure 2 The figure shows a schematic diagram of the switch control of the first light source 180 and the second light source 190 of the electronic device 1 according to the first embodiment of the present invention. Figure 2 In the example, the horizontal axis represents time, and the vertical axis represents the voltage of turning on and off the first light source 180 or the second light source 190. The unit of time is, for example, milliseconds (ms), and the unit of voltage is, for example, volts (V), but the present invention is not limited thereto. Figure 1 and Figure 2, the electronic device 1 of the first embodiment can have a fingerprint sensing mode and a display mode respectively. According to the present invention, when a user, for example, wants to use the electronic device 1 for fingerprint recognition to unlock the device, he can first touch or approach a specific area of ​​the sensing unit of the electronic device 1 with his finger, thereby activating the fingerprint sensing mode of the electronic device 1 of the present invention to perform fingerprint recognition. From a time perspective, when the electronic device 1 is in the fingerprint sensing mode, the first light source 180 is turned on, so that the light 181 and the optical fingerprint sensor 130 assist in identifying the user's identity. At this time, the second light source 190 of the electronic device 1 can also be turned off, that is, the electronic device 1 is not in the display mode. When at least a portion of the light 181 is reflected by the fingerprint pattern, it can enter the cover plate 110 before entering the light control panel 141 for the first time, so at least a portion of the light 181 can enter the cover plate 110 for the first time at different tilt angles θ, which can increase the freedom of design of the first light source 180 in the electronic device 1.

[0034] Next, when the electronic device 1 is in the display mode, the second light source 190 can be turned on to display a predetermined image or picture. At this time, the first light source 180 of the electronic device 1 can also be turned off, that is, the electronic device 1 is not in the fingerprint sensing mode. Figure 2 As shown, the electronic device 1 can also be in the display mode and the fingerprint sensing mode alternately as needed. The first light source 180 or the second light source 190 can refer to the above principle and switch on and off alternately corresponding to the display mode or the fingerprint sensing mode of the electronic device 1 as needed.

[0035] Figure 3 The figure shows the relationship between light intensity and angle in the electronic device of each embodiment of the present invention, which is used to define the concepts of collimated light and non-collimated light used in the present invention. Figure 3 In the figure, the vertical axis represents the relative intensity of light, and the light with the largest relative intensity is defined as the strongest light. The horizontal axis represents the angle between the direction of light travel and the direction of the strongest light travel. Figure 3 As can be seen from the figure, the larger the angle between the direction of light travel and the direction of the strongest light travel, the smaller the light intensity. If the relative light intensity of the strongest light is defined as 1, then the angle between the light with a relative light intensity of 0.5 and the direction of the strongest light travel is defined as the half-value angle. For example, Figure 3 The half-decay angle is about ±8 degrees. Light with a half-decay angle within ±15 degrees is defined as collimated light, and light with a half-decay angle greater than ±15 degrees is defined as non-collimated light. Figure 3 It can also be seen that if the half-decay angle is greater than ±15 degrees, the light intensity will drop to essentially close to 0.

[0036] In the electronic device 1 of the first embodiment of the present invention, a light 181 emitted by a first light source 180 adjacent to the cover plate 110 can be provided for fingerprint recognition. The distance between the light 181 and the fingerprint is short, and the reflected light path is also small, which can improve the photoelectric conversion efficiency and sensing accuracy and reduce the probability of other messy light incident. Therefore, the problem of stray light interference can be improved. Due to one or more of the above advantages, the electronic device 1 and / or fingerprint recognition method provided in this embodiment can provide better fingerprint recognition accuracy.

[0037] The electronic device and the method for receiving fingerprint data by the electronic device of the present invention are not limited to the above-mentioned embodiments. Other embodiments or variations of the present invention will be further disclosed below. In order to simplify the description and highlight the differences between the embodiments or variations, the same reference numerals are used to mark the same elements below, and the repeated parts will not be repeated. In addition, the materials and thicknesses of each film layer and the conditions of the process steps in the subsequent embodiments of the present invention can all refer to the first embodiment, so they will not be repeated.

[0038] Figure 4A and Figure 4B FIG. 1 is a schematic structural diagram of an electronic device according to a second embodiment of the present invention, and shows the structure of each component in a cross-sectional view. Figure 4A FIG. 2 is a schematic diagram showing an electronic device in a display mode according to a second embodiment of the present invention. Figure 4B The electronic device 2 of the second embodiment of the present invention is in a fingerprint sensing mode. The electronic device 2 of the second embodiment may include a cover plate 110, a color filter layer 120, an optical fingerprint sensor 130, a transistor array 140, an optical structure layer 150, a light transmittance adjustment layer 161, a light guide plate 170, a first light source 180, and a second light source 190.

[0039] The electronic device 2 of the second embodiment can also be any device that generates light, like the electronic device 1 of the first embodiment, and thus will not be described in detail. The electronic device 2 of this embodiment further has a built-in sensor that can be used to sense fingerprint data so that the electronic device 2 has a fingerprint recognition function, such as an optical fingerprint sensor 130 and a first light source 180, but the present invention is not limited thereto.

[0040] In the electronic device 2 of the second embodiment, the first light source 180 can be a single light source or an integrated light source module. For example, the first light source 180 can be integrated into the stack layers of the electronic device 2 to form an integrated light source module. The integrated light source module can include a light emitting diode + lens. The lens can include a combination of a concave lens, a telecentric lens, etc., but the present invention is not limited thereto. The second light source 190 can be, for example, a side-entry backlight. The light transmittance adjustment layer 161 can be located between the optical structure layer 150 and the first light source 180. It is an optical material layer that can adjust the light transmittance, that is, the misty state of light scattering and the transparent state of light penetration, through an external voltage. For example, it can be a polymer dispersed liquid crystal (PDLC), but the present invention is not limited thereto. In the second embodiment of the present invention, the first light source 180 can cooperate with the light transmittance adjustment layer 161 and the optical fingerprint sensor 130 to perform an optical fingerprint sensing function.

[0041] The electronic device 2 of the second embodiment can be in a display mode or a fingerprint sensing mode as required, and the light transmittance adjustment layer 161, the first light source 180, and the second light source 190 are switched on and off accordingly. The following only describes the differences between the electronic device 2 of the second embodiment and the electronic device 1 of the first embodiment, and the similarities are not repeated.

[0042] Figure 5 The figure shows a schematic diagram of the switch control of the first light source 180 and the second light source 190 of the electronic device 2 according to the second embodiment of the present invention. Figure 5 In the figure, the horizontal axis represents time, and the vertical axis represents the voltage of turning on and off the first light source 180, the light transmittance adjustment layer 161, and the second light source 190. The unit of time is, for example, milliseconds (ms), and the unit of voltage is, for example, volts (V), but the present invention is not limited thereto. Figure 4B and Figure 5 , the electronic device 2 of the second embodiment can have a fingerprint sensing mode and a display mode respectively. From a temporal point of view, when the electronic device 2 is in the fingerprint sensing mode, the first light source 180 is turned on, and at the same time, a sufficient external voltage is applied to the light transmittance adjustment layer 161, so that the light transmittance adjustment layer 161 is in a transparent state (transparent State) with a transmittance greater than 90%, so that the light 181 can actually penetrate the light transmittance adjustment layer 161 and reach the fingerprint pattern on the cover plate 110 at an incident angle that is nearly parallel to the normal direction of the cover plate 110. Therefore, the light 181 and the optical fingerprint sensor 130 can assist the user in identifying the identity. At this time, the second light source 190 of the electronic device 2 can also be turned off, that is, the electronic device 2 is not in the display mode.

[0043] Next, please refer to Figure 4A and Figure 5 When the electronic device 2 is in the display mode, the second light source 190 can be turned on to generate light 191 to display a predetermined image or picture, and no external voltage is applied to the light transmittance adjustment layer 161, so that the light transmittance adjustment layer 161 is in a diffusing state with a transmittance of less than 90%. When the light transmittance adjustment layer 161 is in the diffusing state, the electronic device 2 can be in the display mode regardless of whether the first light source 180 of the electronic device 2 is turned off or on. Turning on the first light source 180 can help increase the brightness of the display mode. Figure 5 As shown, the electronic device 2 can also be in the display mode and the fingerprint sensing mode alternately as needed. The first light source 180 or the second light source 190 can refer to the above principle and switch on and off corresponding to the display mode or the fingerprint sensing mode of the electronic device 2 as needed.

[0044] In one implementation of the electronic device 2 of the second embodiment, there may be an optical fingerprint sensor 130. In another implementation, there may be no optical fingerprint sensor 130. As required, the electronic device 2 of the second embodiment may have a narrow viewing angle state or a wide viewing angle state, regardless of whether it is in the fingerprint sensing mode. For example, when the light transmittance adjustment layer 161 is in a transparent state (such as Figure 4B ), after passing through the light transmittance adjustment layer 161, the light 181 can be substantially collimated light, and can be used as a display light source of the light control panel 141, and can be used for narrow viewing angle display applications, so that the electronic device 2 can achieve a narrow viewing angle anti-peeping effect, but the present invention is not limited to this. On the other hand, when the light transmittance adjustment layer 161 is in a diffuse state (such as Figure 4A As shown), the angle at which the light 181 and / or the light 191 enters the light control panel 141 can be adjusted, so that the light control panel 141 of the electronic device 2 can be applied for a wide viewing angle display.

[0045] In another embodiment of the electronic device 2 of the second embodiment of the present invention (not shown), the structure of the stack can be further simplified, for example, it can include a cover plate, a color filter layer, an optical fingerprint sensor, a transistor array, an optical structure layer, a light transmittance adjustment layer, a light guide plate and a second light source, but the present invention is not limited thereto. The light transmittance adjustment layer can be between the transistor array and the optical structure layer, and is closer to the cover plate than the optical structure layer. The optical structure layer can be, for example, an inverse prism, but the present invention is not limited thereto, and is arranged correspondingly to the light guide plate. The light guide plate can include a microstructure of dots, which can adjust the second light source to collimated light, and achieve the function of display or fingerprint sensing through the optical structure layer, but the present invention is not limited thereto. The second light source can use a side-entry backlight source, and can cooperate with the light transmittance adjustment layer to perform an optical fingerprint sensing function together, so the electronic device of this embodiment will also be in a display mode or a fingerprint sensing mode, and the light transmittance adjustment layer and the second light source are switched on and off accordingly. For example, when the electronic device is in fingerprint sensing mode, the second light source can be turned on, and sufficient external voltage is applied to the light transmittance adjustment layer to make the light transmittance adjustment layer transparent. Therefore, when the light emitted by the second light source passes through the special mesh structure of the light guide plate, it can be adjusted into collimated light and reach the fingerprint pattern on the cover plate at an incident angle that is nearly parallel to the normal direction of the cover plate. Thus, the collimated light and the optical fingerprint sensor can identify the user's identity.

[0046] When the electronic device is in the display mode, no external voltage is applied to the light transmittance adjustment layer, so that the light transmittance adjustment layer is in a diffuse state. The light of the first light source can still pass through the color filter layer in the diffuse state to generate light to display a predetermined image or picture. The electronic device can also be alternately in the display mode and the fingerprint sensing mode as needed. The light transmittance adjustment layer can refer to the above principles and switch between the diffuse state and the transparent state corresponding to the display mode or fingerprint sensing mode required by the electronic device as needed. In this embodiment, there can be only a second light source, which is a technically feasible solution with a relatively simple structural combination.

[0047] Regardless of whether the electronic device 2 of the second embodiment is in the fingerprint sensing mode, the electronic device 2 of the second embodiment can also adjust the state of the light transmittance adjustment layer 161 to have a narrow viewing angle state or a wide viewing angle mode. After the light actually penetrates the light transmittance adjustment layer, it can reach the fingerprint pattern on the cover at an incident angle close to parallel to the normal direction of the cover, reducing the probability of other messy light incident, thereby also improving the problem of stray light interference. Due to one or more of the above advantages, the electronic device and / or fingerprint recognition method provided in this embodiment can provide better fingerprint recognition accuracy.

[0048] Fig. 6A and Figure 6B FIG. 1 is a schematic structural diagram of an electronic device according to a third embodiment of the present invention, and shows the structure of each component in a cross-sectional view. Fig. 6A FIG. 1 is a schematic diagram showing an electronic device in a display mode according to a third embodiment of the present invention. Figure 6B The electronic device of the third embodiment of the present invention is shown in the fingerprint sensing mode. The electronic device 3 of the third embodiment may include a cover plate 110, a color filter layer 120, an optical fingerprint sensor 130, a transistor array 140, an optical structure layer 150, a light transmittance adjustment layer 161, and a first light source 180. The first light source 180 may represent an integrated collimated light source module and cooperate with the light transmittance adjustment layer 161 to perform an optical fingerprint sensing function.

[0049] The electronic device 3 of the third embodiment can also be any device that generates light, like the electronic device 1 shown in the first embodiment, and thus will not be described in detail. The electronic device 3 of this embodiment has a built-in sensor that can be used to sense fingerprint data so that the electronic device 3 has a fingerprint recognition function, and can include, for example, an optical fingerprint sensor 130, a light transmittance adjustment layer 161, and a first light source 180, but the present invention is not limited thereto.

[0050] The electronic device 3 of the third embodiment can be in a display mode or a fingerprint sensing mode as needed, and the light transmittance adjustment layer 161 and the first light source 180 are switched on and off accordingly. The following only describes the differences between the electronic device 3 of the third embodiment and the electronic device 2 of the second embodiment, and the similarities are not repeated.

[0051] Figure 7 The diagram is a schematic diagram of the switch control of the first light source 180 and the light transmittance adjustment layer 161 of the electronic device 3 according to the third embodiment of the present invention. Figure 7 In FIG. 1 , the horizontal axis represents time, and the vertical axis represents the voltage of turning on and off the first light source 180 and the light transmittance adjustment layer 161. The unit of time is, for example, milliseconds (ms), and the unit of voltage is, for example, volts (V), but the present invention is not limited thereto. Please refer to Figure 6B and Figure 7, the electronic device 3 of the third embodiment can have a fingerprint sensing mode and a display mode respectively. From a temporal point of view, when the electronic device 3 is in the fingerprint sensing mode, the first light source 180 can be turned on, and at the same time, a sufficient external voltage is applied to the light transmittance adjustment layer 161, so that the light transmittance adjustment layer 161 is in a transparent state with a transmittance greater than 90%, so the light 181 provided by the first light source 180 can substantially penetrate the light transmittance adjustment layer 161, and reach the fingerprint pattern on the cover plate 110 at an incident angle that is nearly parallel to the normal direction of the cover plate 110, and reflect the appropriate light signal into the optical fingerprint sensor 130. Therefore, the light 181 or the optical fingerprint sensor 130 can assist in the identification of the user's identity.

[0052] Next, please refer to Fig. 6A and Figure 7 When the electronic device 3 is in the display mode, no external voltage is applied to the light transmittance adjustment layer 161, so that the light transmittance adjustment layer 161 is in a diffuse state with a transmittance of less than 90%, for example. The light 181 of the first light source 180 can then pass through the light transmittance adjustment layer 161, adjust the incident angle of the light 181, and then enter the color filter layer 120 to generate light to display a predetermined image or picture. The electronic device 3 can also be alternately in the display mode and the fingerprint sensing mode as needed. The light transmittance adjustment layer 161 can refer to the above principles and switch between the diffuse state and the transparent state corresponding to the display mode or fingerprint sensing mode required by the electronic device 3 as needed.

[0053] In this embodiment, the light guide plate and the additional second light source can be omitted, which is a technically feasible solution with a simpler structural combination. After the light actually penetrates the light transmittance adjustment layer, it reaches the fingerprint pattern on the cover plate at an incident angle that is nearly parallel to the normal direction of the cover plate, reducing the probability of other messy light incident, thereby also improving the problem of stray light interference. Due to one or more of the above advantages, the electronic device 3 and / or fingerprint recognition method provided in this embodiment can provide better fingerprint recognition accuracy.

[0054] Figure 8 The figure shows a schematic diagram of the structure of an electronic device according to the fourth embodiment of the present invention, and shows the structure of each component in a cross-sectional manner. The electronic device 4 according to the fourth embodiment may include a cover plate 110, a color filter layer 120, an optical fingerprint sensor 130, a transistor array 140, an optical structure layer 150, a light transmittance adjustment layer 161, and a first light source 180. The light transmittance adjustment layer 161 may be located between the light control panel 141 and the first light source 180.

[0055] In the electronic device 4 of the fourth embodiment, the first light source 180 may be an integrated collimated light source module. In particular, the direction of the light 181 generated by the first light source 180 when it first enters the cover plate 110 may present a non-0 degree skew angle with respect to the normal direction of the cover plate 110. The light transmittance adjustment layer 161 may include a polymer dispersed liquid crystal. In the fourth embodiment of the present invention, the first light source 180 may cooperate with the light transmittance adjustment layer 161 to perform an optical fingerprint sensing function.

[0056] The electronic device 4 of the fourth embodiment can also be any device that generates light, just like the electronic device 1 of the first embodiment, so it will not be described in detail. The electronic device 4 of this embodiment has a built-in sensor that can be used to sense fingerprint data so that the electronic device 4 can have a fingerprint recognition function, for example, it can include an optical fingerprint sensor 130, a light transmittance adjustment layer 161 and a first light source 180, but the present invention is not limited to this. The electronic device 4 of this embodiment can be in a display mode or a fingerprint sensing mode as needed, and the light transmittance adjustment layer 161 and the first light source 180 can be switched on and off accordingly. The operation method of the display mode or the fingerprint sensing mode of the electronic device 4 of the fourth embodiment is basically the same as that of the electronic device 3 of the third embodiment, so it will not be described in detail. In particular, the light 181 provided by the first light source 180 of the electronic device 4 of the fourth embodiment of the present invention, when it first enters the cover plate 110, can present a skew angle of not 0 degrees with respect to the normal direction of the surface of the cover plate 110 for optical fingerprint recognition. Therefore, the light 181 and the optical fingerprint sensor 130 can assist in the identification of the user's identity.

[0057] In another implementation of the electronic device 4 of the fourth embodiment of the present invention (not shown), the light transmittance adjustment layer 161 can be interposed between the first light source 180 and the optical structure layer 150. In addition, the light 181 provided by the first light source can be approximately parallel to the normal direction of the surface of the cover plate 110 when it first enters the cover plate 110.

[0058] In another implementation of the electronic device 4 of the fourth embodiment of the present invention, two optical structure layers 150 may be included, so the light transmittance adjustment layer 161 may be disposed between the two optical structure layers 150. In addition, the light 181 provided by the first light source may be approximately parallel to the normal direction of the surface of the cover plate 110 when it first enters the cover plate 110.

[0059] In another implementation of the electronic device 4 of the fourth embodiment of the present invention, the electronic device 4 may not need the optical structure layer 150, so the light transmittance adjustment layer 161 may be located between the transistor array 140 and the first light source 180. In addition, the light 181 provided by the first light source 180 may be approximately parallel to the normal direction of the surface of the cover plate 110 when it first enters the cover plate 110.

[0060] In this embodiment, the light guide plate and the additional second light source can be omitted, and even the optical structure layer can be omitted, so it can be a technically feasible solution with a simpler structural combination. At the same time, it is not limited whether the light 181 must reach the fingerprint pattern on the cover plate with an incident angle close to 0 degrees, so it has more design flexibility.

[0061] Fig. 9 The figure shows a schematic diagram of the structure of the electronic device of the fifth embodiment of the present invention, and shows the structure of each component in a cross-sectional manner. The electronic device 5 of the fifth embodiment of the present invention may include a cover plate 110, a light control panel 141, an optical fingerprint sensor 130, an optical structure layer 150, a diffusion layer 160, a light guide plate 170, an optical adjustment structure 172 and a second light source 190. The light control panel 141 may include a color filter layer 120 and a transistor array 140. In the electronic device 5 of the fifth embodiment, a side-entry backlight source may be selected as the second light source 190. The light control panel 141 may include liquid crystal or electronic paper. The optical adjustment structure 172 may be formed by a yellow light process, or may be adhered with a commercially available anti-peep film.

[0062] The electronic device 5 of the fifth embodiment can also be any device that generates light, just like the electronic device 1 of the first embodiment, so it is not described in detail. The electronic device 5 of this embodiment has a built-in sensor that can be used to sense fingerprint data so that the electronic device 5 can have a fingerprint recognition function, for example, it can include an optical fingerprint sensor 130, an optical adjustment structure 172 and a second light source 190, but the present invention is not limited thereto.

[0063] Please refer to Fig. 9, the light control panel 141 can be located between the cover plate 110 and the light guide plate 170. The optical adjustment structure 172 can be located in the light control panel 141, for example, between the second element 190 serving as a backlight source and the cover plate 110. The optical fingerprint sensor 130 can be located between the second element 190 serving as a backlight source and the cover plate 110, for example, between the light guide plate 170 and the cover plate 110. The second light source 190 can provide light 191, and the light 191 is adjusted to light 181 after passing through the optical adjustment structure 172. In the electronic device 5 of the present embodiment, the optical adjustment structure 172 can be a privacy screen, but the present invention is not limited thereto. The privacy screen is designed like a grating, and light with a large angle will be blocked after passing through the privacy screen, leaving only light sources with a small angle to pass through. In the electronic device 5 of this embodiment, the optical adjustment structure 172 and the optical fingerprint sensor 130 are correspondingly arranged. After the light 191 provided by the second light source 190 passes through the optical adjustment structure 172, it can be regarded as adjusted into a light 181 having similar collimated light and enters the cover 110 to sense the fingerprint pattern (not shown) on the cover 110. The light 181 and the optical fingerprint sensor 130 can assist in identifying the user's identity.

[0064] In the electronic device 5 of the fifth embodiment of the present invention, the relative positions of the optical fingerprint sensor 130 and the optical adjustment structure 172 in the electronic device 5 are not limited. Fig. 9 As shown, the optical fingerprint sensor 130 can be located above the optical adjustment structure 172 and disposed adjacent to the cover 110. In another embodiment, the optical adjustment structure 172 can be located above the optical fingerprint sensor 130 and disposed adjacent to the cover 110, and the optical adjustment structure 172 can even directly contact the cover 110, while the optical fingerprint sensor 130 is located below the color filter layer 120. Alternatively, both the optical fingerprint sensor 130 and the optical adjustment structure 172 can be located between the color filter layer 120 and the cover 110.

[0065] In another implementation of the electronic device 5 of the fifth embodiment of the present invention (not shown), the first light source 180 can also be used as the light source of the electronic device 5 to replace the edge-type backlight source and the light guide plate at the same time, but the present invention is not limited to this. The first light source 180 can be a single light source or an integrated light source module. In this implementation, the relative positions of the optical fingerprint sensor 130 and the optical adjustment structure 172 in the electronic device 5 are not limited.

[0066] The electronic device 5 of the fifth embodiment of the present invention can be in a display mode or a fingerprint sensing mode as required. When the electronic device 5 is in the display mode, the light 191 provided by the second light source 190 can pass through the color filter layer 120 to generate light to display a predetermined image or picture. The electronic device 5 can also be in the display mode and the fingerprint sensing mode alternately as required. For details, please refer to the aforementioned Figure 7 Part of the description.

[0067] In the electronic device 5 of the fifth embodiment of the present invention, an optical adjustment structure can be provided to convert non-collimated light into collimated light. Since the optical adjustment structure in the electronic device 5 of the fifth embodiment of the present invention can adjust part of the non-collimated light into collimated light, there is no need to arrange an additional collimated light source, and the photoelectric conversion efficiency or sensing accuracy is improved, and the probability of other messy light incident is reduced, so the problem of stray light interference can be improved.

[0068] Fig.10 The figure shows a schematic diagram of the structure of the electronic device of the sixth embodiment of the present invention, and shows the structure of each component in a cross-sectional manner. The electronic device 6 of the sixth embodiment may include a cover plate 110, a color filter layer 120, a transistor array 140, a light control panel 141, an optical structure layer 150, a first light source 180, and a second light source 190. The light control panel 141 and the first light source 180 may be located on the same side of the cover plate 110 as defined above. The optical fingerprint sensor is optional in the electronic device 6 of the sixth embodiment, but the present invention is not limited thereto.

[0069] In the electronic device 6 of the sixth embodiment, the first light source 180 may be a single light source or an integrated light source module, the second light source 190 may be non-collimated light, and the first light source 180 may provide, for example, a light source with a half-decay angle greater than ±15 degrees. The direction of the light 181 provided by the first light source 180 when it first enters the cover plate 110 may present a skew angle other than 0 degrees with respect to the normal direction of the cover plate 110.

[0070] The electronic device 6 of the sixth embodiment can be in different states as needed. Regardless of whether it is in the fingerprint sensing mode, the electronic device 6 of the sixth embodiment can have a narrow viewing angle state or a wide viewing angle state. For example, when the first light source 180 of the collimated light source is turned on but the second light source 190 is turned off, the light control panel 141 can be switched to a narrow viewing angle display application, so that the electronic device 6 can achieve a narrow viewing angle anti-peeping effect, but the present invention is not limited to this. On the other hand, when the second light source 190 is turned on to provide non-collimated light, the light control panel 141 of the electronic device 6 of the sixth embodiment can be switched to a wide viewing angle display application.

[0071] like Fig.10As shown, the electronic device 6 of the sixth embodiment may not have a light transmittance adjustment layer. In the implementation without a light transmittance adjustment layer, the first light source 180 or the second light source 190 may be arranged in zones, or the first light source 180 or the second light source 190 may also be driven in zones. For example, the first light source 180 is located in one zone and the second light source 190 is located in another zone. The first light source 180 and the second light source 190 may be arranged in a pattern. In the implementation with an optical fingerprint sensor, the first light source 180 may also be arranged corresponding to the optical fingerprint sensor, that is, the positions of the first light source 180 and the second light source 190 may be adjusted according to the position of the optical fingerprint sensor. The first light source 180 and the second light source 190 do not have to be staggered. For example, the first light source 180 and the second light source 190 may also be clearly placed in zones. For example, the first light source 180 may be concentrated in a certain zone, and the second light source 190 may be concentrated in another zone, but the present invention is not limited thereto.

[0072] In this embodiment, the electronic device 6 can have a narrow viewing angle state or a wide viewing angle state. The first light source 180 or the second light source 190 can be arranged in zones, or the first light source 180 or the second light source 190 can also be driven in zones. The optical fingerprint sensor is still optional in the electronic device 6 of the sixth embodiment, so that it has more flexibility in design. Due to one or more of the above advantages, the electronic device 6 and / or fingerprint recognition method provided in this embodiment can be a simpler technically feasible solution.

[0073] Fig.11 Schematic diagram of fingerprint sensing mode of electronic device according to various embodiments of the present invention. Fig.11In the first timing of fingerprint sensing, for example, the light providing pixel LX (i.e., the first group of light providing pixels LX, represented by dotted background patterns) in the composite pixel CPX1 of at least one unit detection block DU is turned on to generate a part of a scanning light, and the part of the scanning light passes through the finger and is reflected to the unit detection block DU, and is, for example, received by the fingerprint sensor FPS (the first part of the pattern sensing unit) of the composite pixel CPX13, so the data in the fingerprint sensor FPS of the composite pixel CPX13 is subsequently collected; in the second timing (not shown), for example, the light providing pixel LX (i.e., the second group of light providing pixels LX) in the composite pixel CPX2 of at least one unit detection block DU is turned on to generate a part of a scanning light, and the part of the scanning light passes through the finger and is reflected to the unit detection block DU, and is, for example, received by the fingerprint sensor FPS (the second part of the pattern sensing unit) of the composite pixel CPX14, so the data in the fingerprint sensor FPS of the composite pixel CPX14 is subsequently collected, but is not limited to this. The turned-on light providing pixel LX and the fingerprint sensor FPS whose value is collected (i.e., the sensing data is collected or read out) can be respectively located in two different composite pixels, and the relative positions of the two different composite pixels are not limited to the following. Fig.11 The relative positions of the light providing pixel LX and the fingerprint sensor FPS whose value is received can be adjusted according to the needs.

[0074] The electronic devices of the embodiments of the present invention can use collimated light sources or adjust the structure of collimated light sources to reduce the generation of stray light, obtain the difference in reflected light intensity caused by the difference in light paths of fingerprint peaks or valleys, and achieve the function of embedded fingerprint recognition design in the display. The features of the embodiments can be mixed and matched as long as they do not violate the spirit of the invention or conflict with each other.

[0075] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electronic device, characterized in that: include: a cover plate; A light control panel; An optical fingerprint sensor; as well as a first light source, wherein the light control panel, the optical fingerprint sensor and the first light source are located on the same side of the cover plate; Wherein, the first light source is used to provide a light for fingerprint sensing, the light has a first relative light intensity, a second relative light intensity and a third relative light intensity, the first relative light intensity is the strongest light, the second relative light intensity is 50% of the strongest light, the first relative light intensity corresponds to 0 degrees, the second relative light intensity corresponds to half the decay angle, and the half decay angle is between ±15 degrees. The third relative light intensity corresponds to every angle between 20 degrees and 60 degrees and every angle between -20 degrees and -60 degrees, and the third relative light intensity is lower than 20% of the strongest light intensity.

2. The electronic device according to claim 1, wherein: When at least a portion of the light is reflected by a detection object, it first enters the cover plate before first entering the light control panel.

3. The electronic device according to claim 1, wherein: When the electronic device is not in a fingerprint sensing mode, the first light source is turned off.

4. The electronic device according to claim 1, wherein: Also includes: a second light source, When the electronic device is in a display mode, the second light source is turned on, and when the electronic device is in a fingerprint sensing mode, the second light source is turned off.

5. The electronic device according to claim 1, wherein: Also includes: A light transmittance adjustment layer is located between the light control panel and the first light source.

6. The electronic device as claimed in claim 5, characterized in that: When the electronic device is in a fingerprint sensing mode, the light transmittance adjustment layer is in a transparent state.

7. The electronic device as claimed in claim 5, characterized in that: When the electronic device is in a display mode, the light transmittance adjustment layer is in a diffusion state.

8. The electronic device as claimed in claim 1, wherein: The direction of the light is parallel to the normal direction of the cover plate.

9. The electronic device as claimed in claim 1, wherein: The direction of the light is at an oblique angle to the normal direction of the cover plate.

10. An electronic device, characterized in that: include: a cover plate; a backlight element; a light control panel, located between the cover plate and the backlight element; an optical adjustment structure, located between the backlight element and the cover plate; as well as an optical fingerprint sensor, located between the backlight element and the cover plate and arranged corresponding to the optical adjustment structure; The backlight element is used to provide a first light for fingerprint sensing, the first light passes through the optical adjustment structure to provide a second light, the second light has a first relative light intensity, a second relative light intensity and a third relative light intensity, the first relative light intensity is the strongest light, the second relative light intensity is 50% of the strongest light, the first relative light intensity corresponds to 0 degrees, the second relative light intensity corresponds to half the decay angle, and the half decay angle is between ±15 degrees. The third relative light intensity corresponds to every angle between 20 degrees and 60 degrees and every angle between -20 degrees and -60 degrees, and the third relative light intensity is lower than 20% of the strongest light intensity.

11. An electronic device, characterized in that: include: a cover plate; A light control panel; as well as a first light source, wherein the light control panel and the first light source are located on the same side of the cover plate; Wherein, the first light source is used to provide a light, the light has a first relative light intensity, a second relative light intensity and a third relative light intensity, the first relative light intensity is the strongest light, the second relative light intensity is 50% of the strongest light, the first relative light intensity corresponds to 0 degrees, the second relative light intensity corresponds to half the decay angle, and the half decay angle is between ±15 degrees, The third relative light intensity corresponds to every angle between 20 degrees and 60 degrees and every angle between -20 degrees and -60 degrees, and the third relative light intensity is lower than 20% of the strongest light intensity.

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