WO2021109045A1 - Under-screen fingerprint collection device, lcd touch screen, and electronic device - Google Patents

Abstract

Provided are an under-screen fingerprint collection device, an LCD touch screen, and an electronic device, The device is applied to the electronic device with the LCD touch screen, the LCD touch screen comprises a liquid crystal panel (140) and a backlight module (150), and a circuit board (110) of the liquid crystal panel (140) forms a bending part under a non-display area of the LCD touch screen. The device comprises a light supplement lamp (120) and a fingerprint acquisition unit, wherein the light supplement lamp (120) is integrated on the bending part of the circuit board (110), and the fingerprint acquisition unit is arranged below the LCD touch screen. Light is projected from the light supplement lamp (120) and is returned from the finger. The fingerprint collection unit collects the light signal carrying the fingerprint signal to generate a fingerprint image. The device integrates the light supplement lamp (120) on the circuit board (110) of the liquid crystal panel (140), realizes the multi-functionality of the circuit board, reduces the auxiliary parts of the light supplement lamp, such as the circuit board, the soldering tin, the double-sided adhesive, the reinforcing plate and the like, thereby reducing the increase in the width of the lower bezel, and increasing the proportion of the LCD touch screen.

Description

Under-screen fingerprint collection device, LCD touch screen, and electronic equipment Technical field

The present invention relates to the technical field of intelligent identification, in particular to an under-screen fingerprint acquisition device, an LCD touch screen, and electronic equipment.

Background technique

Smart phones have entered the era of full screens, and the proportion of mobile phone screens has become larger and larger, so under-screen fingerprint recognition technology has become a trend. The under-screen fingerprint technology of Organic Electroluminescence Display (OLED) screens has entered the commercial era. Figure 1 shows the principle of supplementary light for fingerprint collection under the screen of an OLED screen. As shown in Figure 1, the OLED screen can control the on and off of individual pixels, and use the self-luminescence of the pixels of the OLED screen as a light source to supplement the fingerprint collection under the screen. , To realize the fingerprint recognition function under the screen.

Different from OLED, if the LCD touch screen (Liquid Crystal Display, referred to as: LCD) uses a backlight module to fill light, it cannot control the on and off of individual areas, but can only control the on and off of the backlight module of the entire screen. In addition, the backlight module under the LCD screen has a reflective film, which cannot transmit visible light components. Therefore, the LCD cannot use its own light source to collect and fill light for fingerprints under the screen, and it needs to use an infrared light source to fill light. There are several ways to realize the fill light for fingerprint collection under the LCD screen, one of which is the way to fill the chin. Figure 2 is a front view of the fingerprint collection device under the LCD screen in the prior art. As shown in Figure 2, the device uses the chin to fill light. The fill light is located at the bottom of the LCD screen. The fill light is integrated on the circuit board and connected to the main circuit board through the circuit board. The circuit board is double-sided adhesive. Fixed on the middle frame, because the fill light and the circuit board take up 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 adds 0.7mm to the chin width, specifically: tape width 0.05mm+reinforced structure width 0.15mm+FPC width 0.1mm+solder height 0.05mm+LED height 0.325mm+safe distance=0.675mm+safe distance≥ 0.7mm.

As the fill light and circuit board increase the original chin width of the LCD screen, the screen's proportion is reduced.

Summary of the invention

The present application provides an under-screen fingerprint acquisition device, LCD touch screen, and electronic equipment, which solves the technical problem of the prior art that the original chin width of the LCD screen is increased due to the supplementary light and the circuit board, which in turn leads to a reduction in the screen ratio.

In the first aspect, the present invention provides an under-screen fingerprint collection device, which is applied to electronic devices with LCD touch screens. The LCD touch screen includes a liquid crystal panel and a backlight module that provides a backlight source for the liquid crystal panel. The circuit board of the liquid crystal panel is on the LCD touch screen. The bending part is formed under the non-display area of, and the device includes:

Fill light, the light is integrated on the bending part of the circuit board, the light is used to provide the fingerprint detection light signal of the fingerprint detection area in the LCD touch screen;

The fingerprint collection unit is arranged under the LCD touch screen and is used to detect the light signal returned from the finger above the fingerprint detection area irradiated by the fill light.

Optionally, the fill light is located outside the bending part, and the light emitted by the fill light directly passes through the LCD touch screen.

Optionally, the fill light is located inside the bending part, and the circuit board surrounds the fill light.

Optionally, the fill light is an infrared light source, and the circuit board can transmit infrared light emitted by the fill light.

Optionally, a position on the circuit board opposite to the light-emitting surface of the supplementary lamp is treated with light transmission, so that the infrared light emitted by the supplementary lamp can pass through the circuit board.

Optionally, a through hole is provided on the circuit board at a position opposite to the light-emitting surface of the fill light, and the light signal emitted by the fill light is emitted to the LCD touch screen through the through hole.

Optionally, the circuit board is formed with two bending parts, and the fill light is located between the two bending parts.

Optionally, the fill light is an infrared light source.

Optionally, the fill light is an infrared light die.

Optionally, the fill light 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, the liquid crystal panel and the backlight module are located under the glass cover, and the area where the liquid crystal panel and the backlight module are located forms the display area of the LCD touch screen.

Optionally, the fingerprint collection unit is arranged below the display area of the LCD touch screen.

Optionally, the circuit board is a flexible circuit board FPC.

In a second aspect, the present invention provides an LCD touch screen, including a liquid crystal panel and a backlight module, wherein the circuit board of the liquid crystal panel forms a bending part under the non-display area of the LCD touch screen, and is characterized in that the LCD touch screen further includes a first Aspects and the under-screen fingerprint collection device involved in the optional solution.

In the 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. The circuit board of the liquid crystal panel forms a bending part under the non-display area of the LCD touch screen. The electronic device It further includes the under-screen fingerprint collection device involved in the first aspect and the optional solution.

The present application provides an under-screen fingerprint collection device and terminal equipment. The under-screen fingerprint collection device includes a fill light and a fingerprint collection unit. The circuit board of the liquid crystal panel is a flexible circuit board, and the circuit board of the liquid crystal panel is in the non-volatile state of the LCD touch screen. A bending part can be formed under the display area. Since the fill light is integrated on the bent part of the circuit board of the LCD touch screen, compared with the prior art, the original fill light circuit board is reduced, and the width of the chin is increased. The volume is reduced to less than 0.7mm, thereby increasing the proportion of LCD touch screens. In addition, by arranging the fill light on the inner side of the bent part of the circuit board, using the space inside the bent part, the increase in chin width can be reduced to 0.4mm, which further reduces the increase in chin width and further increases the proportion of LCD touch screens. . Furthermore, the fill light is placed between the end of the circuit board connected to the liquid crystal panel and the bending part, without increasing the width of the chin, and further increasing the proportion of the LCD touch screen.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor.

Figure 1 shows the principle of supplementary light for under-screen fingerprint collection of OLED screens;

Figure 2 is a front view of a fingerprint collection device under an LCD screen in the prior art;

3 is a schematic diagram of the structure of the LCD touch screen in the under-screen fingerprint collection device shown in FIG. 2;

4 is a schematic diagram of the position of the LCD touch screen and its own light source in the under-screen fingerprint collection device shown in FIG. 2;

Fig. 5 is a top view of the fingerprint collection device under the screen shown in Fig. 2;

Fig. 6 is the principle of supplementary light of the fingerprint collection device under the screen shown in Fig. 2;

Fig. 7 is a schematic structural diagram of an under-screen fingerprint collection device according to an exemplary embodiment of the present invention;

Fig. 8 is a schematic structural diagram of an under-screen fingerprint collection device according to another exemplary embodiment of the present invention;

Fig. 9 is a schematic structural diagram of an under-screen fingerprint collection device according to another exemplary embodiment of the present invention;

Fig. 10 is a schematic structural diagram of an under-screen fingerprint collection device according to another exemplary embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of this application and the above-mentioned drawings are used to distinguish similar objects, without having to use To describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein, for example, can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those clearly listed. Those steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment.

Figure 2 is a front view of the fingerprint collection device under the LCD screen in the prior art. As shown in Figure 2, the LCD touch screen includes a glass cover, a liquid crystal panel, and a backlight module. The liquid crystal panel is connected to a flexible printed circuit (Flexible Printed Circuit, FPC for short), and the flexible circuit board is used to connect to the main circuit board. The structure of the main circuit board is not shown here. The flexible circuit board is in an inverted U shape, and the flexible circuit board is bent at the chin. The middle frame of the mobile phone is located under the flexible circuit board and is used to support the LCD screen. A through hole is opened on the middle frame of the mobile phone, and the position of the through hole is opposite to the position of the fingerprint collection unit. The fingerprint acquisition unit includes a lens assembly and a chip. The lens is equipped with a sensor. The chip is used to process the image data collected by the sensor. A flexible circuit board is provided under the fingerprint acquisition unit. The flexible circuit board is used for the fingerprint acquisition unit and the main circuit. The boards are connected.

FIG. 3 is a schematic diagram of the structure of the LCD touch screen in the under-screen fingerprint collection device shown in FIG. 2. As shown in Figure 3, the LCD touch screen includes a glass cover, a liquid crystal panel and a backlight module. Among them, the glass cover plate and the liquid crystal panel are stacked and arranged from top to bottom. The backlight module includes an incremental film, a uniform light film, a light guide plate, a reflective film, and a steel plate stacked from top to bottom. 4 is a schematic diagram of the positions of the LCD touch screen and its own light source in the under-screen fingerprint collection device shown in FIG. 2. As shown in Figure 4, because the backlight module is equipped with a reflective film and cannot transmit visible light components, the LCD touch screen cannot use its own light source to provide light signals for the fingerprint collection unit, and a fill light needs to be used to provide light signals. The fill light may specifically be an infrared light source or a light source of non-visible light of a specific wavelength.

Fig. 5 is a top view of the under-screen fingerprint collection device shown in Fig. 2. As shown in Figure 5, at the lower end of the LCD touch screen, that is, the chin area, a fill light is provided. A fingerprint detection area is provided on the LCD touch screen, and the position of the fingerprint detection area corresponds to the position of the fingerprint collection unit. Continuing to refer to Figure 2, the fill light is located at the lower end of the LCD touch screen, and the fill light is set on the flexible circuit board. The circuit board is used for electrical connection with the fill light. The flexible circuit board is fixed on the middle frame of the mobile phone by double-sided adhesive. The flexible circuit board is connected to the main circuit board. In the electrical connection structure of the fill light and the circuit board, there are soldering tin and reinforcement structure, etc., which will not be repeated here.

Fig. 6 shows the principle of supplementary light of the under-screen fingerprint acquisition device shown in Fig. 2. As shown in Figure 6, the fill light projects light to the finger through the glass cover, and returns to the fingerprint collection unit under the backlight module through the reflection and scattering of the finger. The optical signal carries the biometric information of the finger. For example, for a fingerprint image of a finger, the fingerprint collection unit collects the fingerprint image of the finger and performs analysis and processing to output the recognition result.

Continuing to refer to Figure 2, in order to realize the under-screen fingerprint collection light supplement, the existing under-screen fingerprint acquisition unit is equipped with a light supplement light in the chin area, a flexible circuit board for connecting the light supplement light to the main circuit board, and a flexible circuit board for connecting the light supplement light to the main circuit board. Double-sided tape for fixing flexible circuit boards. In addition, auxiliary structures, such as solder and reinforcement structures, need to be added to the chin area. Based on the above structure, the LCD touch screen needs to increase the width of at least 0.7mm on the original basis. However, the chin width of the existing LCD touch screen is only 4mm, and the ratio between the increased width and the original width of the chin is relatively high, which runs counter to the current trend of full-screen displays.

Aiming at the defects of the light-filling structure of the existing fingerprint collection device under the LCD screen, the present invention provides an under-screen fingerprint collection device and terminal equipment to overcome the above-mentioned shortcomings.

The inventive concept of the present invention is that the circuit board of the liquid crystal panel is generally bent in the non-display area of the LCD touch screen, and the circuit board is also required for the fill light. This solution uses the circuit board of the liquid crystal panel to integrate the infrared lamp 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 fill light, and the circuit board of the fill light is subtracted to reduce the fill light. The space occupied by the circuit board of the lamp reduces the increase in the width of the chin on the original basis, that is, the increase in the width can be less than 0.7mm. By integrating the fill light on the outside of the bending part of the circuit board, the width increase can be less than 0.7mm, and integrating the fill light on the inside of the bending part of the circuit board can reduce the width increase to 0.4mm. The fill light is integrated at the end of the circuit board and the liquid crystal panel, and is close to the bending part, so that the width of the chin can not be increased.

It is worth noting that the LCD touch screen is not described in detail in the present invention, mainly to illustrate the connection relationship between the circuit board and the LCD touch screen. The LCD touch screen in the present invention can have the same structure as the LCD touch screen in the prior art.

Fig. 7 is a schematic structural diagram of an under-screen fingerprint collection device according to an exemplary embodiment of the present invention. As shown in Fig. 7, the under-screen fingerprint collection device provided by the present invention is applied to electronic equipment with LCD touch screens. The fingerprint collection device under the screen includes a fill light 120 and a fingerprint collection unit.

Among them, the LCD touch screen includes: a liquid crystal panel 140, a backlight module 150, and a glass cover 130. The backlight module 150 is located under the liquid crystal panel 140, and the liquid crystal panel 140 is located under the glass cover 130. The liquid crystal panel 140 may be a Thin Film Transistor (TFT) liquid crystal or a Dual-Layer Super Twist Nemat (DSTN) liquid crystal. The backlight module 150 includes an incremental film, a uniform light film, a light guide plate, a reflective film, and a steel plate that are sequentially stacked from top to bottom.

In the above-mentioned LCD touch screen, the backlight module 150 provides a backlight light source for the liquid crystal panel 140 through the above-mentioned multilayer structure, and the glass cover 130 plays a role of protecting the liquid crystal panel 140 and the backlight module 150.

The area where the liquid crystal panel 140 and the backlight module 150 are located forms a display area of the LCD touch screen, and a fingerprint detection area 131 is provided in the display area of the LCD touch screen. The space below the non-display area of the LCD touch screen can be used to accommodate the circuit board 110 of the liquid crystal panel 140 and the fill light 120. The light signal emitted by the fill light 120 irradiates the finger above the fingerprint detection area 131, and is reflected and scattered by the finger to return to the under-screen fingerprint collection device under the backlight module 150. The optical signal carries the fingerprint information of the finger. The fingerprint collection device under the screen receives the light signal 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, for example, adopt an FPC-carrying chip (Chip On FPC, abbreviation: COF) packaging method; or adopt a glass-carrying chip (Chip On Glass, abbreviation: COG) packaging method. When the COF packaging method is adopted, the chip of the liquid crystal panel 140 can be fixed on the FPC of the liquid crystal panel 140. When the COG packaging method is adopted, the chip of the liquid crystal panel 140 can be fixed on the glass cover 130 and then led out to the FPC of the liquid crystal panel 140. No matter which packaging method is adopted, the circuit board 110 of the liquid crystal panel 140 will form a bending area under the non-display area of the display screen.

Specifically, the circuit board 110 is formed with a first bending part 111 and a second bending part 112 under the non-display area of the LCD touch screen, so that the circuit board 110 has an inverted U shape. In this embodiment, that is, the two ends of the circuit board 110 are parallel to the liquid crystal panel 140, and the fill light 120 is arranged between the first bending part 111 and the second bending part 112 of the circuit board 110, and is located The outer side of the circuit board 110. The light signal emitted by the fill light 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 can be understood that, in other embodiments, the circuit board 110 may also be provided with only one bending portion, or multiple bending portions, and the fill light 120 may also be provided in other positions of the circuit board 110, such as the second bending portion. The position of the folding part 112 close to the glass cover 130, etc., and the specific setting position can be determined according to the light output angle of the fill light 120 and or the positional relationship with the fingerprint detection area 131. In this embodiment, the fill light 120 is directly integrated on the circuit board 110 of the liquid crystal panel 140, and the turn off of the fill light 120 can be controlled by the circuit board 110, that is, the fill light 120 and the liquid crystal panel 140 share the circuit board 110. By properly designing the circuit board 110, the fill light 120 and the liquid crystal panel 140 can be controlled by the circuit board 110.

The fill light 120 may be an infrared light source, such as an infrared light emitting diode, an infrared light emitting diode chip. The fill light 120 may also be an infrared light die. The size of the infrared light die is smaller than that of the infrared light. The use of the infrared light die can further reduce the increase in the chin.

The fingerprint collection unit is arranged under the LCD touch screen, and is used to detect the light signal returned from the finger by the fill light 120 irradiating the finger located above the fingerprint detection area 131. Specifically, the fingerprint collection unit can be arranged under the display area of the LCD touch screen or under the non-display area. In this embodiment, the fingerprint collection unit includes a collection chip 170 and a lens assembly 160. The lens assembly 160 is used to collect light signals. The collection chip 170 acquires a fingerprint image of a finger according to the light signal, and performs fingerprint detection based on the fingerprint image.

The following describes the working principle of the fingerprint collection device under the screen: when the electronic device enters the fingerprint detection mode, the fill light 120 emits a light signal, and the light signal directly enters the liquid crystal panel 140, and irradiates the fingerprint detection area 131 through the glass cover 130. Finger, the light signal carries the biometric information of the finger after being reflected and scattered by the finger, and the light signal carrying the biometric information of the finger returns, passes through the glass cover 130 and the liquid crystal panel 140 again, and then enters the fingerprint collection through the backlight module 150 Unit, the fingerprint collection unit collects the optical signal carrying the biometric information of the finger, and generates the biometric information of the finger according to the optical signal, and performs fingerprint detection.

In the under-screen fingerprint acquisition device provided by this embodiment, the circuit board of the liquid crystal panel is a flexible circuit board, and the circuit board of the liquid crystal panel can form a bending part under the non-display area of the LCD touch screen. On the bent part of the circuit board of the LCD touch screen, the circuit board is reused. There is no need to configure the circuit board for the fill light separately, and there is no need to install the double-sided adhesive, solder, and reinforcement because the circuit board equipped with the fill light needs to be increased accordingly. Structures such as structures save the space occupied by the above structures, thereby reducing the width of the chin area. The invention saves the double-sided tape, solder, reinforcement structure and other structures, so that the increase in the width of the chin area is less than 0.7mm. Compared with the prior art, the increase in the width of the chin area is smaller, and the proportion of the screen is larger. It is in line with the full-screen trend of existing terminal equipment. In addition, in this embodiment, the fill light is placed on the outside of the circuit board, which can improve the utilization rate of light emitted by the fill light.

Fig. 8 is a schematic structural diagram of an under-screen fingerprint collection device according to another exemplary embodiment of the present invention. As shown in Fig. 8, the under-screen fingerprint collection device provided by the present invention is applied to electronic equipment with LCD touch screens. The under-screen fingerprint collection device provided by the present invention includes: a fill light 220 and a fingerprint collection unit. Wherein, the fill light 220 is integrated on the circuit board 210, and the fingerprint collection unit is arranged under the LCD touch screen.

As shown in FIG. 8, the difference between the under-screen fingerprint collection device provided in this embodiment and the under-screen fingerprint collection device shown in FIG. 7 is that the fill light 220 is provided at the first bending part 211 and the second bending part 211 of the circuit board 210. Between the bending parts 212 and located inside the circuit board 210, that is, the circuit board 210 surrounds the fill light 220. The circuit board 210 surrounds the fill light 220. The light signal emitted by the fill light 220 enters the liquid crystal panel 240 after passing through the circuit board 210, and then illuminates the finger above the fingerprint detection area 231, and is reflected and scattered by the finger, and returns to An under-screen fingerprint collection device under the backlight module 250. In this embodiment, further, the section between the second bent portion 212 and the first end 214 of the circuit board 210 is treated with light transmission. The relative positions of the light-emitting surface of the fill light 220, such as 213 in the figure, are processed for light transmission to reduce the loss of light emitted by the fill light 220 and improve the light of the fill light 220 to penetrate the circuit The transmittance of the plate 210 is used to provide light signals for the fingerprint collection unit to form high-quality finger images and improve detection accuracy.

In this embodiment, the light supplement lamp 220 is an infrared light source, such as an infrared light-emitting diode chip, etc., and the light signal emitted by the light supplement lamp 220 is infrared light. The relative positions of the light emitting surface of the light lamp 220 are treated for light transmission, that is, the circuit board 210 can be made of materials that can transmit infrared light, so that the circuit board 210 can transmit the infrared light emitted by the fill light 220. Furthermore, the utilization rate of the infrared light emitted by the fill light 220 is improved. For example, the material of the circuit board 210 may be a material that transmits infrared light with a wavelength of 940 nm.

The following describes the working principle of the fingerprint acquisition unit under the screen: when the electronic device enters the fingerprint detection, the fill light emits a light signal, and the light signal enters the liquid crystal panel 240 through the circuit board (or the light-transmitting part of the circuit board), and then passes through the glass cover The plate 230 irradiates the finger located on the fingerprint detection area 231, and the light signal carries the biometric information of the finger after being reflected and scattered by the finger. The optical signal carrying the biometric information of the finger returns, and passes through the glass cover 230 and the liquid crystal panel again. 240, and then enter the fingerprint collection unit through the backlight module 250. The fingerprint collection unit collects the biometric information light signal carrying the finger, and generates the biometric information of the finger according to the light signal to perform fingerprint detection.

In the under-screen fingerprint collection device provided by this embodiment, the fill light is integrated on the bending part of the circuit board, and placed inside the bending part of the circuit board, making full use of the space of the circuit board at the bending part, and the chin can be removed. The increase in width is reduced to 0.4mm. In addition, considering that the fill light is surrounded by the circuit board, the light emitted by the fill light needs to pass through the circuit board. Therefore, let the circuit board material pass through the light emitted by the fill light, so that more light is projected to In terms of fingerprints, the images collected by the fingerprint collection unit are more complete, thereby improving the accuracy of fingerprint recognition. As an alternative solution, light-transmitting processing can be performed on the light-transmitting part of the circuit board to increase the light signal of the light supplement lamp transmitted through the circuit board, reduce the loss of the light signal emitted by the light supplement light, and thereby improve the accuracy of fingerprint recognition.

It can be understood that, in this embodiment, the fill light 220 is not limited to an infrared light emitting diode chip, and may also be an infrared die (bare die). The size of the infrared light die is smaller than that of the infrared lamp. Infrared light die can further reduce the amount of jaw increase.

Fig. 9 is a schematic structural diagram of an under-screen fingerprint collection device according to another exemplary embodiment of the present invention. As shown in Figure 9, the under-screen fingerprint collection device provided by the present invention is applied to electronic equipment with LCD touch screens. The under-screen fingerprint collection device provided by the present invention includes: a fill light 320 and a fingerprint collection unit. Wherein, the fill light 320 is integrated on the circuit board 310, and the fingerprint collection unit is arranged under the LCD touch screen.

More specifically, the fill light 320 is disposed between the first bending part 311 and the second bending part 312 of the circuit board 310 and is located inside the circuit board 310, and the circuit board 310 surrounds the fill light 320.

As shown in FIG. 9, the difference between the under-screen fingerprint collection device provided in this embodiment and the under-screen fingerprint collection device shown in FIG. A through hole 313 is opened in between, so that the light signal emitted by the fill light 320 is emitted to the LCD touch screen through the through hole 313. Preferably, the above-mentioned through hole 313 is at a position corresponding to the light-emitting surface of the fill light 320.

The following describes the working principle of the fingerprint collection unit under the screen: when the electronic device enters the fingerprint detection, the supplementary light emits a light signal, and the light signal emitted by the supplementary light is emitted to the liquid crystal panel 340 through the through hole, and then irradiated by the glass cover 330 To the finger on the fingerprint detection area 331, the light signal carries the biometric information of the finger after passing through the finger, and the light signal carrying the biometric information of the finger returns, passes through the glass cover 330 and the liquid crystal panel 340 again, and then passes through the backlight The module 350 enters the fingerprint collection unit, and the fingerprint collection unit collects the optical signal carrying the biometric information of the finger, and generates the biometric information of the finger according to the optical signal to perform fingerprint detection.

In the under-screen fingerprint acquisition device provided by this embodiment, the light signal emitted by the fill light is emitted to the LCD touch screen through the through hole, which reduces the loss of light emitted by the fill light to a minimum, so that more light is projected onto the fingerprint. The images collected by the fingerprint collection unit are more complete, thereby improving the accuracy of fingerprint recognition.

Fig. 10 is a schematic structural diagram of an under-screen fingerprint collection device according to another exemplary embodiment of the present invention. As shown in FIG. 10, the under-screen fingerprint collection device provided by the present invention is applied to electronic equipment with LCD touch screens. The under-screen fingerprint collection device provided by the present invention includes: a fill light 420 and a fingerprint collection unit. Wherein, the fill light 420 is integrated on the circuit board 410, and the fingerprint collection unit is arranged under the LCD touch screen.

As shown in FIG. 10, the difference between the under-screen fingerprint collection device provided in this embodiment and the under-screen fingerprint collection device shown in FIG. 7 is that the fill light 420 is located on the first end 414 of the circuit board 410, and It is close to the second bending part 412 of the circuit board 410. Wherein, the first end is the end of the electrical connection between the circuit board and the LCD touch screen.

More specifically, in the circuit board 110 having an inverted U shape, the upper first end 414 of the circuit board 410 is parallel to the liquid crystal panel 440, and the upper first end 414 is electrically connected to the LCD touch screen to supplement light. The lamp 420 is placed between the upper first end 414 and the second bending part 412. In this embodiment, by placing the fill light 420 at the above-mentioned position, the width of the chin of the LCD touch screen may not be increased. Further, in this embodiment, the fill light 420 is an infrared light die, the height of the infrared light die is generally 0.15mm, and there is a certain gap between the circuit board 410 and the glass cover 430, The supplementary light 420 is arranged between the circuit board 410 and the glass cover 430, and will not affect the increase of the overall height. Further, since the light signal emitted by the light supplement 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 by the light supplement lamp 420 during the transmission process can be reduced.

It can be understood that, in this embodiment, the supplementary light 420 is not limited to an infrared light die, and it may also be an infrared light emitting diode, an infrared light emitting diode chip, or the like.

The following describes the working principle of the fingerprint collection device under the screen: when the electronic device enters the fingerprint detection, the fill light emits a light signal, and the light signal enters the liquid crystal panel 440, and irradiates the finger on the fingerprint detection area 431 through the glass cover 430. After the signal is reflected and scattered by the finger, it carries the biometric information of the finger, and the light signal carrying the biometric information of the finger returns, passes through the glass cover and the liquid crystal panel 440 again, and then enters the fingerprint collection unit through the backlight module 450, where the fingerprint is collected The unit collects the optical signal carrying the biometric information of the finger, and generates the biometric information of the finger according to the optical signal for fingerprint detection.

In the under-screen fingerprint acquisition device provided in this embodiment, the fill light is placed at the first end of the circuit board and is close to the bent part of the circuit board. Compared with the existing chin fill light structure, this embodiment The provided solution can achieve the goal of not increasing the width of the chin, and can reduce the loss of the light signal emitted by the fill light lamp during the transmission process.

A person of ordinary skill in the art can understand that all or part of the steps in the foregoing method embodiments can be implemented by a program instructing relevant hardware. The aforementioned program can be stored in a computer readable storage medium. When the program is executed, it executes the steps including the foregoing method embodiments; and the foregoing storage medium includes: ROM, RAM, magnetic disk, or optical disk and other media that can store program codes.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or equivalently replace some or all of the technical features; these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. range.

Claims (15)

An under-screen fingerprint collection device, which is characterized in that it is applied to an electronic device with an LCD touch screen. The LCD touch screen includes a liquid crystal panel and a backlight module that provides a backlight light source for the liquid crystal panel. The circuit board of the liquid crystal panel is A bending part is formed under the non-display area of the LCD touch screen, and the device includes: A fill light, the fill light is integrated on the bending part of the circuit board, and the fill light is used to provide a fingerprint detection light signal in a fingerprint detection area on the LCD touch screen; The fingerprint collection unit is arranged under the LCD touch screen, and is used to detect the light signal returned from the finger above the fingerprint detection area by the fill light lamp. The device according to claim 1, characterized in that: The light supplement lamp is located outside the bending part, and the light emitted by the light supplement lamp directly passes through the LCD touch screen. The device according to claim 1, characterized in that: The supplementary light is located inside the bending part, and the circuit board surrounds the supplementary light. The device according to claim 3, characterized in that: The fill light is an infrared light source, and the circuit board can transmit the infrared light emitted by the fill light. The device according to claim 3, characterized in that: The position on the circuit board opposite to the light-emitting surface of the supplementary lamp is treated with light transmission, so that the infrared light emitted by the supplementary lamp can pass through the circuit board. The device according to claim 5, wherein the circuit board is provided with a through hole at a position opposite to the light-emitting surface of the fill light, and the light signal emitted by the fill light is emitted to the through hole through the through hole. The LCD touch screen. The device according to any one of claims 2 to 6, characterized in that: The circuit board is formed with two bending parts, and the fill light is located between the two bending parts. The device according to claim 1, characterized in that: The fill light is an infrared light source. The device according to claim 1, characterized in that: The fill light is an infrared light die. The device according to claim 1, characterized in that: The fill light is located on the first end of the circuit board, and is close to the bent portion of the circuit board; Wherein, the first end is electrically connected to the LCD touch screen. The device of claim 1, wherein the LCD touch screen further comprises: a glass cover; The liquid crystal panel and the backlight module are located under the glass cover, and the area where the liquid crystal panel and the backlight module are located forms a display area of the LCD touch screen. The device according to claim 11, wherein the fingerprint collection unit is arranged below the display area of the LCD touch screen. The device according to claim 1, wherein the circuit board is a flexible circuit board (FPC). An LCD touch screen, comprising a liquid crystal panel and a backlight module that provides a backlight light source for the liquid crystal panel, wherein the circuit board of the liquid crystal panel forms a bending part under the non-display area of the LCD touch screen, and is characterized in The LCD touch screen further comprises the under-screen fingerprint collection device according to any one of claims 1 to 13. An electronic device including an LCD touch screen, the LCD touch screen including a liquid crystal panel and a backlight module that provides a backlight light source for the liquid crystal panel, and a circuit board of the liquid crystal panel forms a bend under the non-display area of the LCD touch screen Part, characterized in that, the electronic device further comprises the under-screen fingerprint collection device according to any one of claims 1 to 13.

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