CN111108513B - Under-screen fingerprint acquisition device, LCD touch screen and electronic equipment - Google Patents

Under-screen fingerprint acquisition device, LCD touch screen and electronic equipment Download PDF

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Publication number
CN111108513B
CN111108513B CN201980004428.4A CN201980004428A CN111108513B CN 111108513 B CN111108513 B CN 111108513B CN 201980004428 A CN201980004428 A CN 201980004428A CN 111108513 B CN111108513 B CN 111108513B
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light
circuit board
lcd touch
touch screen
screen
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CN111108513A (en
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青小刚
李顺展
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Shenzhen Goodix Technology Co Ltd
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Shenzhen Goodix Technology Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13338—Input devices, e.g. touch panels

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Human Computer Interaction (AREA)
  • Optics & Photonics (AREA)
  • Image Input (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

The application provides an under-screen fingerprint acquisition device, an LCD touch screen and electronic equipment. The device includes light filling lamp and fingerprint acquisition unit, and the light filling lamp is integrated on the position of buckling of circuit board, and fingerprint acquisition unit sets up in LCD touch-sensitive screen below. The light supplementing lamp projects light to the finger and returns from the finger, and the fingerprint acquisition unit acquires the light signal carrying the fingerprint signal to generate a fingerprint image. The application integrates the light supplementing lamp on the circuit board of the liquid crystal panel, realizes the multiplexing of the circuit board, reduces auxiliary parts such as the circuit board, soldering tin, double-sided adhesive tape, reinforcing plate and the like of the light supplementing lamp, further reduces the increment of the width of chin and improves the duty ratio of the LCD touch screen.

Description

Under-screen fingerprint acquisition device, LCD touch screen and electronic equipment
Technical Field
The application relates to the technical field of intelligent recognition, in particular to an under-screen fingerprint acquisition device, an LCD touch screen and electronic equipment.
Background
When the smart phone enters the full screen era, the ratio of the mobile phone screen is larger and larger, and then the under-screen fingerprint identification technology is a trend. The technology of under-screen fingerprinting of organic laser display (Organic Electroluminescence Display, abbreviated as OLED) screens has entered the commercial age. Fig. 1 is a light supplementing principle of on-screen fingerprint acquisition of an OLED screen, as shown in fig. 1, the OLED screen can control on-off of individual pixels, and self-luminescence of the pixels of the OLED screen is used as a light source to supplement light for on-screen fingerprint acquisition, so that an on-screen fingerprint identification function is realized.
Unlike the OLED, if the LCD touch screen (Liquid Crystal Display, abbreviated as LCD) is used for supplementing light, the individual area can not be controlled to be on or off, and the whole screen backlight module can only be controlled to be on or off. The backlight module below the LCD screen is provided with a reflecting film which cannot transmit visible light components, so that the LCD cannot use a self light source to collect light for the fingerprint under the screen, and the light is supplemented by an infrared light source. There are several ways to realize the light filling of fingerprint collection under the LCD screen, one of which is chin light filling. Fig. 2 is a front view of a prior art LCD on-screen fingerprint acquisition device. As shown in fig. 2, the device adopts a chin light filling mode, a light filling lamp is located at the side end of an LCD screen, the light filling lamp is integrated on a circuit board and connected with a main circuit board through a flexible circuit board (FPC), and the flexible circuit board is fixed on a middle frame through a double sided adhesive tape, and because the light filling lamp and the circuit board need to occupy space, the LCD screen needs to be increased by a certain width on the basis of the original chin width. More specifically, the prior art increases the chin width by 0.7mm, specifically: the adhesive tape width is 0.05 mm+the reinforcing structure width is 0.15 mm+the FPC width is 0.1 mm+the soldering tin height is 0.05 mm+the LED height is 0.325 mm+the safety distance=0.675 mm+the safety distance is not less than 0.7mm.
The light supplementing lamp and the flexible circuit board increase the original chin width of the LCD screen, so that the screen duty ratio is reduced.
Disclosure of Invention
The application provides an under-screen fingerprint acquisition device, an LCD touch screen and electronic equipment, which solve the technical problem that the screen occupation ratio is reduced because a light supplementing lamp and a circuit board increase the original chin width of the LCD screen in the prior art.
In a first aspect, the present application provides an under-screen fingerprint acquisition device, an LCD touch screen, and an electronic device, applied to an electronic device having an LCD touch screen, where the LCD touch screen includes a liquid crystal panel and a backlight module for providing a backlight source for the liquid crystal panel, a circuit board of the liquid crystal panel forms a bending portion below a non-display area of the LCD touch screen, and the device includes:
the light supplementing lamp is integrated on the bending part of the circuit board and is used for providing fingerprint detection light signals of a fingerprint detection area in the LCD touch screen;
the fingerprint acquisition unit is arranged below the LCD touch screen and is used for detecting the light signals of the light supplementing lamp irradiating the finger above the fingerprint detection area and returning from the finger.
Optionally, the light-compensating lamp is located outside the bending part, and the light emitted by the light-compensating lamp directly penetrates through the LCD touch screen.
Optionally, the light supplementing lamp is located at the inner side of the bending part, and the circuit board surrounds the light supplementing lamp.
Optionally, the light supplementing lamp is an infrared light source, and the circuit board can transmit infrared light emitted by the light supplementing lamp.
Optionally, the circuit board is subjected to light transmission treatment at a position opposite to the light emitting surface of the light supplementing lamp, so that infrared light emitted by the light supplementing lamp is transmitted through the circuit board.
Optionally, a through hole is formed in a position, opposite to the light emitting surface of the light supplementing lamp, on the circuit board, and a light signal emitted by the light supplementing lamp is emitted to the LCD touch screen through the through hole.
Optionally, the circuit board is formed with two bending parts, and the light supplementing lamp is located between the two bending parts.
Optionally, the light supplement lamp is an infrared light source.
Optionally, the light supplement lamp is an infrared light die.
Optionally, the light supplementing lamp is located on the first end of the circuit board and is close to the bending part of the circuit board;
wherein the first end is electrically connected to the LCD touch screen.
Optionally, the LCD touch screen further includes a glass cover plate, the liquid crystal panel and the backlight module are located below the glass cover plate, and a display area of the LCD touch screen is formed by an area where the liquid crystal panel and the backlight module are located.
Optionally, the fingerprint acquisition unit is disposed below a display area of the LCD touch screen.
Optionally, the circuit board is a flexible circuit board FPC.
In a second aspect, the present application provides an LCD touch screen, including a liquid crystal panel and a backlight module, where a circuit board of the liquid crystal panel forms a bending portion under a non-display area of the LCD touch screen, and the LCD touch screen is characterized in that the LCD touch screen further includes an under-screen fingerprint acquisition device according to the first aspect and an alternative scheme.
In a third aspect, an electronic device includes an LCD touch screen, the LCD touch screen includes a liquid crystal panel and a backlight module that provides a backlight source for the liquid crystal panel, a circuit board of the liquid crystal panel forms a bending portion under a non-display area of the LCD touch screen, and the electronic device further includes an off-screen fingerprint acquisition device related to the first aspect and the alternative scheme.
The application provides an under-screen fingerprint acquisition device and terminal equipment, wherein the under-screen fingerprint acquisition device comprises a light supplementing lamp and a fingerprint acquisition unit, a circuit board of a liquid crystal panel is a flexible circuit board, and a bending part can be formed below a non-display area of an LCD touch screen by the circuit board of the liquid crystal panel. In addition, through setting up the light filling lamp in the inboard of circuit board bending part, utilize the inboard space of bending part, can the chin width increase reduce to 0.4mm, further reduce the chin width increase, further improved LCD touch screen's duty cycle. Furthermore, the light supplementing lamp is arranged between the end part connected with the liquid crystal panel and the bending part on the circuit board, so that the width of a chin is not required to be increased, and the duty ratio of the LCD touch screen is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a light supplementing principle of off-screen fingerprint acquisition of an OLED screen;
FIG. 2 is a front view of a prior art LCD under-screen fingerprint acquisition device;
FIG. 3 is a schematic diagram of an LCD touch screen of the off-screen fingerprint acquisition device shown in FIG. 2;
FIG. 4 is a schematic diagram of the locations of the LCD touch screen and its own light sources in the off-screen fingerprint acquisition device shown in FIG. 2;
FIG. 5 is a top view of the off-screen fingerprint acquisition device shown in FIG. 2;
FIG. 6 is a light supplementing principle of the off-screen fingerprint acquisition device shown in FIG. 2;
FIG. 7 is a schematic diagram of an off-screen fingerprint acquisition device according to an exemplary embodiment of the present application;
FIG. 8 is a schematic diagram of an off-screen fingerprint acquisition device according to another exemplary embodiment of the present application;
FIG. 9 is a schematic diagram of an off-screen fingerprint acquisition device according to another exemplary embodiment of the present application;
fig. 10 is a schematic structural view of an off-screen fingerprint acquisition device according to yet another exemplary embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented, for example, in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 2 is a front view of a prior art LCD on-screen fingerprint acquisition device. As shown in fig. 2, the LCD touch screen includes a glass cover plate, a liquid crystal panel, and a backlight structure. The liquid crystal panel is connected to a flexible circuit board (Flexible Printed Circuit, abbreviated as FPC) for connection to a main circuit board, which is not shown here. The flexible circuit board is inverted U-shaped, and is bent at the chin. The mobile phone middle frame is positioned below the flexible circuit board and used for supporting the LCD screen. The mobile phone middle frame is provided with a through hole, and the position of the through hole is opposite to that of the fingerprint acquisition unit. The fingerprint acquisition unit comprises a lens assembly and a chip, a sensor is arranged in the lens, the chip is used for processing picture data acquired by the sensor, a flexible circuit board is arranged below the fingerprint acquisition unit, and the flexible circuit board is used for enabling the fingerprint acquisition unit to be connected with the main circuit board.
Fig. 3 is a schematic diagram of the structure of an LCD touch screen in the under-screen fingerprint sensing device shown in fig. 2. As shown in fig. 3, the LCD touch screen includes a glass cover plate, a liquid crystal panel, and a backlight module. Wherein, the glass cover plate and the liquid crystal panel are arranged from top to bottom in a lamination way. The backlight module comprises an increment film, a light homogenizing film, a light guide plate, a reflecting film and a steel plate reinforcement which are arranged in a laminated mode from top to bottom. Fig. 4 is a schematic diagram of the positions of the LCD touch screen and the self light source (backlight module) in the fingerprint acquisition device under the screen shown in fig. 2. As shown in fig. 4, since the backlight module is provided with the reflective film and cannot transmit the visible light component, the LCD touch screen cannot use its own light source to provide the fingerprint acquisition unit with the light signal, and a light supplementing lamp, such as the LED lamp strip in fig. 4, is required to provide the light signal. The light supplement lamp may be embodied as an infrared light source or a light source of non-visible light of a specific wavelength.
Fig. 5 is a top view of the off-screen fingerprint acquisition device shown in fig. 2. As shown in fig. 5, a light supplement lamp is provided at the lower end of the LCD touch screen, i.e., in the chin area. And a fingerprint detection area is arranged on the LCD touch screen, and the position of the fingerprint detection area corresponds to the position of the fingerprint acquisition unit. With continued reference to fig. 2, the light filling lamp is located the lower extreme of LCD touch-sensitive screen, and the light filling lamp sets up on flexible circuit board, and this circuit board is used for being connected with the light filling lamp electricity, and the flexible circuit board passes through double faced adhesive tape to be fixed on the cell-phone center, and the main circuit board is connected to the flexible circuit board, in the electric connection structure of light filling lamp and circuit board, still soldering tin and additional strengthening etc. are not repeated here.
Fig. 6 is a light supplementing principle of the under-screen fingerprint acquisition device shown in fig. 2. As shown in fig. 6, the light supplement lamp projects light to the finger through the glass cover plate, and returns to the fingerprint acquisition unit below the backlight module after reflection and scattering of the finger, the optical signal carries the biological characteristic information of the finger, for example, the fingerprint image of the finger, and the fingerprint acquisition unit acquires the fingerprint image of the finger and performs analysis processing to output the identification result.
With continued reference to fig. 2, in order to realize the light filling of the fingerprint collection under the screen, the existing fingerprint collection unit under the screen is provided with a light filling lamp in the chin area, a flexible circuit board for connecting the light filling lamp to the main circuit board and a double faced adhesive tape for fixing the flexible circuit board. In addition, auxiliary structures such as: solder, reinforcing structures, and the like. Based on the above structure, the LCD touch screen needs to be increased by at least more than 0.7mm in width on the original basis. The width of the chin of the conventional LCD touch screen is only 4mm, and the ratio between the increased width and the original width of the chin is high, which is contrary to the trend of the conventional comprehensive screen.
Aiming at the defects of the light supplementing structure of the existing LCD screen under-screen fingerprint acquisition device, the application provides the under-screen fingerprint acquisition device and terminal equipment to overcome the defects.
The application is characterized in that: the circuit board of the liquid crystal panel is generally bent in the non-display area of the LCD touch screen, and the light compensating lamp also needs the circuit board. According to the scheme, the circuit board of the liquid crystal panel is utilized, the infrared lamp is integrated on the circuit board of the liquid crystal panel, the circuit board of the liquid crystal panel is multiplexed with the circuit board of the light supplementing lamp, the circuit board of the light supplementing lamp is subtracted, the occupied space of the circuit board of the light supplementing lamp can be further reduced, the increasing amount of the width of a chin on the original basis is reduced, and the increasing amount of the width is smaller than 0.7mm. The light supplementing lamp is integrated on the outer side of the bending part of the circuit board, so that the width increasing amount is smaller than 0.7mm, and the light supplementing lamp is integrated on the inner side of the bending part of the circuit board, so that the width increasing amount is reduced to 0.4mm. The light supplementing lamp is integrated at the end part of the circuit board, which is connected with the liquid crystal panel, and is close to the bending part, so that the width of the chin can not be increased.
It should be noted that, the connection relation between the circuit board and the LCD touch screen is mainly described in the present application, and the LCD touch screen is not described in detail, wherein the LCD touch screen in the present application may have the same structure as the LCD touch screen in the prior art.
Fig. 7 is a schematic diagram illustrating an off-screen fingerprint acquisition device according to an exemplary embodiment of the present application. As shown in fig. 7, the under-screen fingerprint acquisition device provided by the application is applied to an electronic device with an LCD touch screen. The off-screen fingerprint acquisition device comprises a light supplementing lamp 120 and a fingerprint acquisition unit.
Wherein, LCD touch-sensitive screen includes: a liquid crystal panel 140, a backlight module 150, and a glass cover 130. The backlight module 150 is located below the liquid crystal panel 140, and the liquid crystal panel 140 is located below the glass cover 130. The liquid crystal panel 140 may be a thin film transistor (Thin Film Transistor, abbreviated as TFT) type liquid crystal or a Dual scan twisted nematic (Dual-Layer Super Twist Nemat, abbreviated as DSTN) type liquid crystal. The backlight module 150 includes an incremental film, a light homogenizing film, a light guide plate, a reflective film, and a steel plate, which are sequentially stacked from top to bottom.
In the LCD touch panel, the backlight module 150 provides the backlight source for the liquid crystal panel 140 through the multi-layer structure, and the glass cover 130 plays a role of protecting the liquid crystal panel 140 and the backlight module 150.
The liquid crystal panel 140 and the backlight module 150 are positioned in a region forming a display region of the LCD touch screen, and the fingerprint detection region 131 is disposed in the display region of the LCD touch screen. The space under the non-display area of the LCD touch screen may be used to accommodate the circuit board 110 and the light compensating lamp 120 of the liquid crystal panel 140. The light signal emitted by the light compensating lamp 120 irradiates the finger above the fingerprint detection area 131, and returns to the under-screen fingerprint acquisition device below the backlight module 150 through reflection and scattering of the finger. The optical signal carries fingerprint information of the finger. The off-screen fingerprint acquisition device receives the optical signal and is used for fingerprint detection.
The circuit board 110 of the liquid crystal panel 140 may be an FPC. The Chip of the liquid crystal panel 140 may be, for example, a Chip On FPC (COF for short); or a packaging mode of a Glass bearing Chip (Chip On Glass, COG for short) is adopted. When the COF package method is adopted, the chip of the liquid crystal panel 140 may be fixed to the FPC of the liquid crystal panel 140. When the COG packaging method is adopted, the chip of the liquid crystal panel 140 may be fixed on the glass cover 130, and then led out to the FPC of the liquid crystal panel 140. In either of the above packaging methods, the circuit board 110 of the liquid crystal panel 140 forms a bending region under the non-display region of the display screen.
Specifically, the circuit board 110 is formed with a first bending portion 111 and a second bending portion 112 below a non-display area of the LCD touch screen, so that the circuit board 110 has an inverted U shape. In this embodiment, that is, two ends of the circuit board 110 are parallel to the liquid crystal panel 140, the light compensating lamp 120 is disposed between the first bending portion 111 and the second bending portion 112 of the circuit board 110 and is located outside the circuit board 110. The light signal emitted by the light compensating lamp 120 does not need to enter the LCD touch screen after passing through the circuit board 110, but directly passes through the LCD touch screen.
It should be understood that in other embodiments, the circuit board 110 may be provided with only one bending portion, or a plurality of bending portions, and the light compensating lamp 120 may be disposed at other positions of the circuit board 110, such as a position of the second bending portion 112 near the glass cover 130, etc., and the specific disposition position may be determined according to the light emitting angle of the light compensating lamp 120 and/or the positional relationship with the fingerprint detection area 131. In this embodiment, the light compensating lamp 120 is directly integrated on the circuit board 110 of the liquid crystal panel 140, the extinction of the light compensating lamp 120 can be controlled by the circuit board 110, that is, the light compensating lamp 120 and the liquid crystal panel 140 share the circuit board 110, and by reasonably designing the circuit board 110, the light compensating lamp 120 and the liquid crystal panel 140 can be controlled by the circuit board 110.
The light supplement lamp 120 may be an infrared light source, for example: an infrared light emitting diode, an infrared light emitting diode chip. The light supplement lamp 120 may also be an infrared light die (die) that is smaller in size than the infrared light, and the use of the infrared light die may further reduce chin build-up.
The fingerprint acquisition unit is disposed below the LCD touch screen, and is configured to detect an optical signal that the light supplement lamp 120 irradiates a finger located above the fingerprint detection area 131 and returns from the finger. Specifically, the fingerprint acquisition unit may be disposed below a display area of the LCD touch screen, or may be disposed below a non-display area. In this embodiment, the fingerprint acquisition unit includes an acquisition chip 170 and a lens assembly 160, the lens assembly 160 is used for acquiring an optical signal, and the acquisition chip 170 acquires a fingerprint image of a finger according to the optical signal and performs fingerprint detection according to the fingerprint image.
The following describes the working principle of the fingerprint acquisition device under the screen: after the electronic device enters the fingerprint detection mode, the light supplementing lamp 120 emits light signals, the light signals directly enter the liquid crystal panel 140, the light signals are irradiated to the finger positioned on the fingerprint detection area 131 through the glass cover plate 130, the light signals carry the biological characteristic information of the finger after being reflected and scattered by the finger, the light signals carrying the biological characteristic information of the finger return, the light signals pass through the glass cover plate 130 and the liquid crystal panel 140 again, then enter the fingerprint acquisition unit through the backlight module 150, the fingerprint acquisition unit acquires the biological characteristic information light signals carrying the finger, and the biological characteristic information of the finger is generated according to the light signals, so that fingerprint detection is performed.
The fingerprint acquisition device under screen that this embodiment provided, wherein, liquid crystal panel's circuit board is flexible circuit board, liquid crystal panel's circuit board can form the position of buckling in LCD touch-sensitive screen's non-display area below, owing to integrate the light filling lamp on LCD touch-sensitive screen's circuit board's the position of buckling, realize that the circuit board is multiplexing, need not to dispose the circuit board for the light filling lamp alone, also need not to set up simultaneously owing to dispose the circuit board of light filling lamp and need corresponding increased structures such as double faced adhesive tape, soldering tin, additional strengthening, save the space that above-mentioned structure occupy, and then reduce the width in chin area. According to the application, by saving the structures such as the double-sided adhesive tape, soldering tin and the reinforcing structure, the width increment of the chin area is smaller than 0.7mm, and compared with the prior art, the width increment of the chin area is smaller, the screen occupation ratio is larger, and the comprehensive screen trend of the existing terminal equipment is more met. In addition, the light supplementing lamp is arranged on the outer side of the circuit board, so that the utilization rate of light emitted by the light supplementing lamp can be improved.
Fig. 8 is a schematic structural view of an off-screen fingerprint acquisition device according to another exemplary embodiment of the present application. As shown in fig. 8, the under-screen fingerprint acquisition device provided by the application is applied to an electronic device with an LCD touch screen. The application provides an under-screen fingerprint acquisition device, which comprises: a light supplement 220 and a fingerprint acquisition unit. The light compensating lamp 220 is integrated on the circuit board 210, and the fingerprint acquisition unit is disposed below the LCD touch screen.
As shown in fig. 8, the difference between the off-screen fingerprint acquisition device provided in this embodiment and the off-screen fingerprint acquisition device shown in fig. 7 is that: the light compensating lamp 220 is disposed between the first bending portion 211 and the second bending portion 212 of the circuit board 210, and is located inside the circuit board 210, i.e. the circuit board 210 surrounds the light compensating lamp 220. The circuit board 210 surrounds the light supplementing lamp 220, and the light signal emitted by the light supplementing lamp 220 can enter the liquid crystal panel 240 after passing through the circuit board 210, irradiates the finger above the fingerprint detection area 231, and returns to the under-screen fingerprint acquisition device below the backlight module 250 after being reflected and scattered by the finger. In this embodiment, further, a light transmission process is performed on a section between the second bending portion 212 and the first end portion 214 of the circuit board 210, preferably, a light emitting portion 213 in the figure, for example, is performed on a position of the circuit board 210 opposite to the light emitting surface of the light compensating lamp 220, so as to reduce the loss of light emitted by the light compensating lamp 220, improve the transmittance of the light penetrating the circuit board 210 by the light compensating lamp 220, and provide a light signal for the fingerprint acquisition unit, so as to form a high-quality finger image and improve the detection precision.
In this embodiment, the light compensating lamp 220 is an infrared light source, such as an infrared light emitting diode chip, and the light signal emitted by the light compensating lamp 220 is infrared light, so that the position of the circuit board 210 opposite to the light emitting surface of the light compensating lamp 220 is subjected to light transmission treatment, that is, the circuit board 210 may be made of a material capable of transmitting infrared light, so that the circuit board 210 can transmit infrared light emitted by the light compensating lamp 220, thereby improving the utilization rate of infrared light emitted by the light compensating lamp 220, for example: the material of the circuit board 210 may be a material that transmits infrared light having a wavelength of 940 nm.
The working principle of the under-screen fingerprint acquisition unit is described as follows: after the electronic device enters the fingerprint detection, the light supplementing lamp emits a light signal, the light signal enters the liquid crystal panel 240 through the circuit board (or the light transmission part of the circuit board), the finger positioned on the fingerprint detection area 231 is irradiated by the glass cover plate 230, the light signal carries the biological characteristic information of the finger after being reflected and scattered by the finger, the light signal carrying the biological characteristic information of the finger returns and passes through the glass cover plate 230 and the liquid crystal panel 240 again, and then enters the fingerprint acquisition unit through the backlight module 250, the fingerprint acquisition unit acquires the biological characteristic information light signal carrying the finger, and the biological characteristic information of the finger is generated according to the light signal, so as to carry out fingerprint detection.
The fingerprint acquisition device under screen that this embodiment provided, with the light filling lamp integrated on the position of buckling of circuit board, place the inboard at the position of buckling of circuit board, make full use of circuit board is at the space of the position of buckling, can reduce the increase of chin width to 0.4mm. In addition, consider the light filling lamp to be surrounded by the circuit board, the light that the light filling lamp launched needs to pass the circuit board, consequently, let circuit board material be the material of the light that the light filling lamp launched of permeating, let more light projection to the fingerprint on, the image that the fingerprint acquisition unit gathered is more complete, and then improves fingerprint identification precision. As an alternative scheme, the light transmission part of the circuit board can be subjected to light transmission treatment, the light signal of the light supplementing lamp transmitted through the circuit board is increased, the loss of the light signal emitted by the light supplementing lamp is reduced, and further fingerprint identification precision is improved.
It is to be understood that, in the present embodiment, the light-compensating lamp 220 is not limited to an ir led chip, but may be an ir die (die), and the size of the ir die is smaller than that of the ir lamp, so that the chin increasing amount can be further reduced by using the ir die.
Fig. 9 is a schematic structural view of an off-screen fingerprint acquisition device according to yet another exemplary embodiment of the present application. As shown in fig. 9, the under-screen fingerprint acquisition device provided by the application is applied to an electronic device with an LCD touch screen. The application provides an under-screen fingerprint acquisition device, which comprises: a light supplement lamp 320 and a fingerprint acquisition unit. The light supplement lamp 320 is integrated on the circuit board 310, and the fingerprint acquisition unit is disposed below the LCD touch screen.
More specifically, the light supplement lamp 320 is disposed between the first bending portion 311 and the second bending portion 312 of the circuit board 310 and is located inside the circuit board 310, and the circuit board 310 surrounds the light supplement lamp 320.
As shown in fig. 9, the difference between the off-screen fingerprint acquisition device provided in this embodiment and the off-screen fingerprint acquisition device shown in fig. 8 is that: a through hole 313 is formed between the second bending portion 312 and the first end portion 314 of the circuit board 310, so that the light signal emitted by the light compensating lamp 320 is emitted to the LCD touch screen through the through hole 313. Preferably, the through hole 313 is located at a position corresponding to the light emitting surface of the light compensating lamp 320.
The working principle of the under-screen fingerprint acquisition unit is described as follows: after the electronic device enters the fingerprint detection, the light supplementing lamp emits light signals, the light signals emitted by the light supplementing lamp are emitted to the liquid crystal panel 340 through the through holes, the light signals are irradiated to the finger positioned on the fingerprint detection area 331 through the glass cover plate 330, the light signals are transmitted by the finger and then carry the biological characteristic information of the finger, the light signals carrying the biological characteristic information of the finger return, the light signals pass through the glass cover plate 330 and the liquid crystal panel 340 again and then enter the fingerprint acquisition unit through the backlight module 350, and the fingerprint acquisition unit acquires the biological characteristic information light signals carrying the finger and generates the biological characteristic information of the finger according to the light signals so as to carry out fingerprint detection.
The fingerprint acquisition device under screen that this embodiment provided, the light signal of light filling lamp transmission is through the through-hole outgoing to LCD touch-sensitive screen, reduces the loss of light filling lamp transmission light to minimum to let more light projection to the fingerprint on, the image that fingerprint acquisition unit gathered is more complete, and then improves fingerprint identification precision.
Fig. 10 is a schematic structural view of an off-screen fingerprint acquisition device according to yet another exemplary embodiment of the present application. As shown in fig. 10, the under-screen fingerprint acquisition device provided by the application is applied to an electronic device with an LCD touch screen. The application provides an under-screen fingerprint acquisition device, which comprises: a light supplement lamp 420 and a fingerprint acquisition unit. The light supplement lamp 420 is integrated on the circuit board 410, and the fingerprint acquisition unit is disposed below the LCD touch screen.
As shown in fig. 10, the difference between the off-screen fingerprint acquisition device provided in this embodiment and the off-screen fingerprint acquisition device shown in fig. 7 is that: the light compensating lamp 420 is located on the first end 414 of the circuit board 410 and is close to the second bending portion 412 of the circuit board 410. The first end part is the end part of the circuit board electrically connected with the LCD touch screen.
More specifically, in the circuit board 110 having the inverted U-shape, the first end 414 of the circuit board 410 positioned above is parallel to the liquid crystal panel 440, the first end 414 positioned above is electrically connected to the LCD touch screen, and the light supplement lamp 420 is disposed between the first end 414 positioned above and the second bending portion 412. In this embodiment, by placing the light supplement lamp 420 at the above position, it is possible to implement that the chin width of the LCD touch screen is not increased. Further, in the present embodiment, the light compensating lamp 420 is an infrared light bare chip, the height of the infrared light bare chip is generally 0.15mm, and a certain gap is provided between the circuit board 410 and the glass cover 430, so that the light compensating lamp 420 is disposed between the circuit board 410 and the glass cover 430, and the overall height increase is not affected. Further, since the light signal emitted from the light compensating lamp 420 is directly irradiated to the finger through the liquid crystal panel 440 and the glass cover 430, the loss of the light signal emitted from the light compensating lamp 420 in the transmission process can be reduced.
It is understood that in the present embodiment, the light supplement lamp 420 is not limited to the infrared light die, but may be an infrared light emitting diode, an infrared light emitting diode chip, or the like.
The following describes the working principle of the fingerprint acquisition device under the screen: after the electronic device enters the fingerprint detection, the light supplementing lamp emits light signals, the light signals enter the liquid crystal panel 440, the light signals irradiate the finger located on the fingerprint detection area 431 through the glass cover plate 430, the light signals carry the biological characteristic information of the finger after being reflected and scattered by the finger, the light signals carrying the biological characteristic information of the finger return, the light signals pass through the glass cover plate and the liquid crystal panel 440 again, then enter the fingerprint acquisition unit through the backlight module 450, the fingerprint acquisition unit acquires the biological characteristic information light signals carrying the finger, and the biological characteristic information of the finger is generated according to the light signals so as to carry out fingerprint detection.
In the fingerprint acquisition device under screen that this embodiment provided, place the light filling lamp in the first tip of circuit board, and be close to the kink of circuit board, compare in current chin light filling structure, the scheme that this embodiment provided can realize not increasing the chin width to can reduce the loss of light filling lamp emission light signal in transmission process.
Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the method embodiments described above may be performed by hardware associated with program instructions. The foregoing program may be stored in a computer readable storage medium. The program, when executed, performs steps including the method embodiments described above; and the aforementioned storage medium includes: various media that can store program code, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

Claims (15)

1. An under-screen fingerprint acquisition device, characterized in that is applied to the electronic equipment that has LCD touch-sensitive screen, the LCD touch-sensitive screen includes liquid crystal display panel and for the backlight module of liquid crystal display panel provides backlight source, liquid crystal display panel's circuit board forms the bending part under the non-display area of LCD touch-sensitive screen, the device includes:
the light supplementing lamp is integrated on the bending part of the circuit board and is used for providing fingerprint detection light signals of the fingerprint detection area on the LCD touch screen; the circuit board of the liquid crystal panel is multiplexed with the circuit board of the light supplementing lamp;
the fingerprint acquisition unit is arranged below the LCD touch screen and is used for detecting the light signals of the light supplementing lamp irradiating the finger above the fingerprint detection area and returning from the finger.
2. The apparatus according to claim 1, wherein:
the light supplementing lamp is positioned at the outer side of the bending part, and light emitted by the light supplementing lamp directly penetrates through the LCD touch screen.
3. The apparatus according to claim 1, wherein:
the light supplementing lamp is positioned at the inner side of the bending part, and the circuit board surrounds the light supplementing lamp.
4. A device according to claim 3, characterized in that:
the light supplementing lamp is an infrared light source, and the circuit board can transmit infrared light emitted by the light supplementing lamp.
5. A device according to claim 3, characterized in that:
and the position, opposite to the light emitting surface of the light supplementing lamp, on the circuit board is subjected to light transmission treatment so that infrared light emitted by the light supplementing lamp penetrates through the circuit board.
6. The device of claim 5, wherein a through hole is formed in the circuit board at a position opposite to the light emitting surface of the light compensating lamp, and the light signal emitted by the light compensating lamp exits to the LCD touch screen through the through hole.
7. The apparatus according to any one of claims 2 to 6, wherein:
the circuit board is formed with two bending parts, and the light supplementing lamp is positioned between the two bending parts.
8. The apparatus according to claim 1, wherein:
the light supplementing lamp is an infrared light source.
9. The apparatus according to claim 1, wherein:
the light supplementing lamp is an infrared light bare chip.
10. The apparatus according to claim 1, wherein:
the light supplementing lamp is positioned on the first end part of the circuit board and is close to the bending part of the circuit board;
wherein the first end is electrically connected with the LCD touch screen.
11. The apparatus of claim 1, wherein the LCD touch screen further comprises: a glass cover plate;
the liquid crystal panel and the backlight module are positioned below the glass cover plate, and the area where the liquid crystal panel and the backlight module are positioned forms a display area of the LCD touch screen.
12. The device of claim 11, wherein the fingerprint acquisition unit is disposed below a display area of the LCD touch screen.
13. The device of claim 1, wherein the circuit board is a flexible circuit board, FPC.
14. An LCD touch screen comprising a liquid crystal panel and a backlight module providing a backlight source for the liquid crystal panel, wherein a circuit board of the liquid crystal panel forms a bending portion under a non-display area of the LCD touch screen, characterized in that the LCD touch screen further comprises an under-screen fingerprint acquisition device according to any one of claims 1 to 13.
15. An electronic device comprising an LCD touch screen, the LCD touch screen comprising a liquid crystal panel and a backlight module providing a backlight source for the liquid crystal panel, a circuit board of the liquid crystal panel forming a bending portion under a non-display area of the LCD touch screen, characterized in that the electronic device further comprises an off-screen fingerprint acquisition device according to any one of claims 1 to 13.
CN201980004428.4A 2019-12-04 2019-12-04 Under-screen fingerprint acquisition device, LCD touch screen and electronic equipment Active CN111108513B (en)

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