CN211348911U - Liquid crystal display fingerprint identification system, electronic device and fingerprint identification module - Google Patents

Liquid crystal display fingerprint identification system, electronic device and fingerprint identification module Download PDF

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Publication number
CN211348911U
CN211348911U CN201921882551.XU CN201921882551U CN211348911U CN 211348911 U CN211348911 U CN 211348911U CN 201921882551 U CN201921882551 U CN 201921882551U CN 211348911 U CN211348911 U CN 211348911U
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Prior art keywords
fingerprint identification
module
fingerprint
identification module
sensor
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CN201921882551.XU
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Chinese (zh)
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熊峰
刘凯
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Shenzhen Goodix Technology Co Ltd
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Shenzhen Goodix Technology Co Ltd
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Abstract

The utility model provides a liquid crystal display fingerprint identification system, electron device and fingerprint identification module, display device, including display module assembly, backlight unit and fingerprint identification module, backlight unit is close to the one end of fingerprint identification module is equipped with the region of buckling, buckle regional with it is used for holding to have formed between the display module assembly the accommodation space of fingerprint identification module assembly, the fingerprint identification module is located in the accommodation space to realize that the display effect of display module assembly can be guaranteed simultaneously to fingerprint identification under the LCD optical screen.

Description

Liquid crystal display fingerprint identification system, electronic device and fingerprint identification module
Technical Field
The utility model relates to a biological identification technical field especially relates to a liquid crystal display fingerprint identification system, electron device and fingerprint identification module.
Background
At present, mass-produced optical fingerprint identification mobile phones under screens can only be realized by matching with an organic light emitting diode display screen. An organic light-Emitting Diode (OLED) belongs to a current type organic light-Emitting device, and a mobile phone adopting an OLED screen utilizes self luminescence of pixels of the OLED screen as a light source, and light irradiates a finger, is reflected by the finger, penetrates through a mobile phone screen and an optical lens, and is received by a sensor under the screen, so that fingerprint image collection and fingerprint identification are realized.
Liquid Crystal displays (LCD for short) have many advantages such as thin body, power saving, no radiation, etc., and are widely used in electronic products such as televisions, computers, mobile phones, etc. Because the light that the finger reflection/transmission was returned can't pierce through backlight unit, can't form the optical signal detection return circuit of fingerprint under the optical screen, the volume production is not realized at present temporarily to the optical fingerprint identification scheme based on the LCD screen, needs the backlight membrane material through improving backlight unit, reduces the interference to light path processing unit to make the fingerprint image after passing the LCD screen satisfy fingerprint identification's requirement. The backlight film material of the backlight module comprises a brightness enhancement film, a diffusion sheet, a light guide plate and a reflection sheet. Each layer of optical film interferes with the fingerprint image, so that a specific optical film needs to be developed for optical fingerprint identification.
However, the existing backlight film cannot meet the requirements of fingerprint identification and screen display at the same time. Therefore, the lower fingerprints of the LCD optical screen have great technical problems.
SUMMERY OF THE UTILITY MODEL
The utility model provides a liquid crystal display fingerprint identification system, electron device and fingerprint identification module to solve the unable requirement that satisfies fingerprint identification and screen display simultaneously of current backlight membrane material, so that the unable problem of realizing fingerprint identification under the LCD optical screen.
A first aspect of the utility model provides a liquid crystal display fingerprint identification system, including display module assembly, backlight unit and fingerprint identification module, backlight unit is close to the one end of fingerprint identification module is equipped with the region of buckling, buckle regional with it is used for holding to have formed between the display module assembly the accommodation space of fingerprint identification module, the fingerprint identification module is located in the accommodation space.
In a specific embodiment of the present invention, the backlight module is bent toward a side away from the display module to form the bending region.
In a specific embodiment of the present invention, the width of the bending region is equal to the width of the backlight module.
In a specific embodiment of the present invention, the width of the bending region is smaller than the width of the backlight module.
The utility model discloses an among the specific implementation manner, the regional kink of buckling with backlight unit is close to the distance of fingerprint identification module one end tip is less than 40 mm.
In a particular embodiment of the invention, the bending angle of the bending region is less than 7 °.
The utility model discloses an among the specific embodiment, backlight unit's deviating from fingerprint identification module's one end is straight region, straight region with the regional rounding off of buckling.
In a specific embodiment of the present invention, the backlight module is fixed on a fixing member, the fixing member includes: the fixing piece body is in a frame shape, and the first supporting portion is used for fixing the backlight module, and the first supporting portion is arranged on the inner side wall of the fixing piece body so as to fix the backlight module in the fixing piece body.
In a specific embodiment of the present invention, the fixing member further includes: and the second supporting part is used for fixing the bending area, and the bending area is fixedly arranged on the display module through the second supporting part.
In a specific embodiment of the present invention, the second supporting portion is located on a side wall of the fixing member body near one end of the bending region.
In a specific embodiment of the present invention, the second supporting portion is higher than the first supporting portion, and the first supporting portion is close to one side edge of the backlight module exposed from the second supporting portion.
In a specific embodiment of the present invention, the first supporting portion and the second supporting portion are steps.
The utility model discloses an among the specific embodiment, backlight unit is in through first shading glue bonding on the first supporting part, it is in through second shading glue bonding to buckle the region display module assembly is close to one side of backlight unit.
The utility model discloses an among the specific implementation mode, first shading glue with the second shading glue all with be equipped with safe distance between the display module assembly's the display area, wherein, safe distance is greater than 0.2 mm.
In a specific embodiment of the present invention, the fixing member is an iron frame or a rubber-iron integrated frame.
In a specific embodiment of the present invention, the backlight module includes: the display module sequentially comprises a brightening film, a diffusion film, a light guide plate and a reflection film, wherein the brightening film is close to one side of the display module, and the reflection film deviates from one side of the display module.
The utility model discloses an among the specific embodiment, being close to of light guide plate the one end of fingerprint identification module be equipped with the second kink of regional structure looks adaptation of buckling.
In a specific embodiment of the present invention, the light guide plate is right to the uniformity of the brightness of the visible light emitted by the backlight module is greater than 90%.
The utility model discloses an among the concrete implementation manner, the mounting is close to at least one wire groove has been seted up to the one end tip of fingerprint identification module, so that backlight unit with the flexible circuit board of fingerprint identification module passes through the wire groove is qualified for the next round of competitions.
The utility model discloses an among the specific implementation manner, buckle regional with there is the clearance between the effective light path district of fingerprint identification module, wherein, effective light path district does the detecting light of fingerprint identification module and warp finger reflection and entering the fingerprint identification module the biggest region that the detecting light formed.
In a particular embodiment of the invention, the gap is greater than 0.3 mm.
The utility model discloses an in the concrete implementation mode, include in the fingerprint identification module: and the light path processing unit is used for reducing the thickness of the fingerprint identification module.
In a specific embodiment of the present invention, the optical path processing unit includes: optical element, reflection element to and be used for fingerprint identification's sensor, wherein, reflection element is located the below of sensor, optical element is located reflection element and the same one side of sensor and be close to fingerprint detection area on the display module assembly sets up, optical element is used for with passing through the display module assembly the detection light assembles on the reflection element, and the warp reflection element reflects to the sensor, in order to carry out fingerprint identification.
The utility model discloses an in the concrete implementation mode, the fingerprint identification module still including be used for to launch on the finger of fingerprint detection area top the detection light source of detecting light, the detection light source is located the top of sensor.
The utility model discloses an among the specific implementation mode, fingerprint identification module is still including being used for fixing and holding detecting light source's first support, first support with detecting light source's top is equipped with first windowing structure, detecting light source passes through first windowing structure to fingerprint detection regional emission detecting light.
In a particular embodiment of the invention, the optical element and the sensor are attached to the bottom of the first support.
The utility model discloses an in the concrete implementation mode, fingerprint identification module is still including being used for the protection the second support of light path processing unit, be equipped with in the second support and be used for holding the accommodation space of light path processing unit, wherein, the second support with optical element relative position department is equipped with the second structure of windowing, the second structure of windowing is used for making to pass display module the detection light transmit extremely the sensor.
In a specific embodiment of the present invention, there is a space between the reflection element and the sensor, so that the sensor receives the detection light reflected by the reflection element and carrying the fingerprint information.
In a specific embodiment of the present invention, the reflective element is attached to the protruding structure on the sensor, or the reflective element is disposed at the bottom of the second support.
The utility model discloses an among the specific embodiment, the clearance packing of fingerprint identification module both sides has the third support.
A second aspect of the present invention provides an electronic device, the electronic device includes any of the above liquid crystal display fingerprint identification system.
The utility model discloses an in the concrete implementation, it holds the chamber to be equipped with the battery in the electron device, the regional point of buckling with there is the interval between the battery holds the chamber.
In a specific embodiment of the present invention, the bending point is close to the backlight module, and the distance between the end of the fingerprint recognition module and the end of the fingerprint recognition module is less than 40 mm.
In a particular embodiment of the invention, the bending angle of the bending region is less than 7 °.
The third aspect of the utility model provides a fingerprint identification module suitable for a liquid crystal display screen, wherein one end of a backlight module of the liquid crystal display screen is provided with a bending region and forms a containing space with a display module, the fingerprint detection area of the fingerprint identification module is at least partially positioned in the display area of the liquid crystal display screen, and it includes an optical element accommodated in the accommodation space, a reflection element, and a sensor for fingerprint recognition, wherein the optical element is positioned on the same side of the reflecting element and the sensor and is close to the fingerprint detection area of the liquid crystal display screen, the optical element is used for converging detection light which is formed by fingers above the liquid crystal display screen and passes through the display module on the reflecting element, the reflection element is used for reflecting the detection light to the sensor, and the sensor is used for receiving the detection light for fingerprint identification.
The utility model discloses an among the specific implementation mode, fingerprint identification module still including be used for to launch on the finger of fingerprint detection area top the detecting light's detecting light source, detecting light source is located the top of sensor, just the detecting light with the wavelength in a poor light that liquid crystal display's backlight unit provided is different.
The utility model discloses an among the specific implementation mode, fingerprint identification module is still including being used for fixing and holding detecting light source's first support, first support with detecting light source's top is equipped with first windowing structure, detecting light source passes through first windowing structure to fingerprint detection regional emission detecting light.
In a particular embodiment of the present invention, the optical element and the fingerprint sensor are attached to the bottom of the first support.
The utility model discloses an in the concrete implementation mode, fingerprint identification module is still including being used for the protection the second support of light path processing unit, be equipped with in the second support and be used for holding the accommodation space of light path processing unit, wherein, the second support with optical element relative position department is equipped with the second structure of windowing, the second structure of windowing is used for making to pass display module the detection light transmit extremely the sensor.
In a specific embodiment of the present invention, there is a distance between the reflective element and the sensor, so that the sensor receives the detected light, which carries the fingerprint information after the reflection of the reflective element, the reflective element is attached to the protruding structure on the sensor, or the reflective element is disposed at the bottom of the second support.
The utility model provides a liquid crystal display fingerprint identification system, electron device and fingerprint identification module, including display module assembly, backlight unit and fingerprint identification module, the one end of backlight unit that is close to the fingerprint identification module is equipped with the bending region, has formed fingerprint identification module accommodation space between bending region and the display module assembly to make the fingerprint identification module be located accommodation space; one end of the backlight module, which is close to the fingerprint identification module, is bent, and an accommodating space is formed between the backlight module and the display module, so that the fingerprint identification module is positioned in the accommodating space; when the fingerprint identification module was located accommodation space, the fingerprint identification module was located backlight unit on, when carrying out fingerprint identification, the detecting light of fingerprint identification module and the detecting light of finger reflex on the display module all need not to pass backlight unit, had avoided the influence to the fingerprint identification image. Therefore, the utility model discloses a structure to backlight unit changes, can guarantee display module assembly's display effect simultaneously in fingerprint identification under realizing the LCD optical screen, has solved the requirement that current backlight film material can't satisfy fingerprint identification and display module assembly's demonstration simultaneously to the problem of fingerprint identification under the unable LCD optical screen that realizes.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a liquid crystal display fingerprint identification system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a fixing member according to an embodiment of the present invention;
FIG. 3 is an enlarged view of a portion A of FIG. 2;
fig. 4 is a schematic structural diagram of a backlight module according to a second embodiment of the present invention;
fig. 5 is a schematic structural diagram of a fingerprint identification module according to a fourth embodiment of the present invention;
fig. 6 is an exploded schematic view of a fingerprint identification system of a liquid crystal display provided by a sixth embodiment of the present invention;
fig. 7 is a schematic structural diagram of a display module according to a seventh embodiment of the present invention;
fig. 8 is a schematic structural diagram of another display module according to a seventh embodiment of the present invention;
fig. 9 is a partial schematic view of another display module according to a seventh embodiment of the present invention.
Description of reference numerals:
a display module-1; display cover-101; a liquid crystal panel-102; a lower polarizer-103; display area-104; non-display area-105; fingerprint detection area-106; infrared-transmitting ink-107; infrared-transmissive ink region-108; a backlight module-2; a brightness enhancement film-201; a diffusion membrane-202; a light guide plate-203; a second bent portion-2031; a reflective film-204; backlight source-205; a bend region-206; flat area-207; a first light-shielding glue-3; a second light-shielding glue-4; a fingerprint identification module-5; an optical path processing unit-501; optical element-5011; reflective element-5012; sensor-5013; a detection light source-502; an effective optical path region-503; a detection light source light emitting region-504; a first support-505; a first windowing structure-5051; a second bracket-506; a flexible circuit board-6; an accommodation space-7; a third support-8; a fixing piece-9; a fixture body-901; a first support portion-902; a second support portion-903; iron frame-904; glue frame-905; outlet slot-906; a first bent portion-907; a battery receiving cavity-10.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The technical solution of the present invention will be described in detail with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
The LCD screen has many advantages such as thin body, power saving, no radiation, etc., and is widely used in electronic products such as televisions, computers, mobile phones, etc. Because the light that the finger reflection/transmission was returned can't pierce through backlight unit, can't form the optical signal detection return circuit of fingerprint under the optical screen, the volume production is not realized at present temporarily to the optical fingerprint identification scheme based on the LCD screen, needs the backlight membrane material through improving backlight unit, reduces the interference to light path processing unit to make the fingerprint image after passing the LCD screen satisfy fingerprint identification's requirement. The backlight film material of the backlight module comprises a brightness enhancement film, a diffusion sheet, a light guide plate and a reflection sheet. Each layer of optical film interferes with the fingerprint image, and therefore, a specific optical film needs to be developed for optical fingerprint identification. However, the existing backlight film cannot meet the requirements of fingerprint imaging and screen display at the same time, so that the fingerprints under the LCD optical screen have great technical problems.
Therefore, the utility model provides a liquid crystal display fingerprint identification system, electron device and fingerprint identification module to solve the unable requirement that satisfies fingerprint formation of image and screen display simultaneously of current backlight membrane material, so that the unable problem of realizing fingerprint identification under the LCD optical screen.
Example one
Fig. 1 is a schematic structural view of a liquid crystal display fingerprint identification system according to an embodiment of the present invention, fig. 2 is a schematic structural view of a fixing member according to an embodiment of the present invention, and fig. 3 is a schematic partial enlarged view of a portion a in fig. 2.
As shown in fig. 1 to fig. 3, the embodiment of the utility model provides a liquid crystal display fingerprint identification system, including display module assembly 1, backlight unit 2 and fingerprint identification module 5, backlight unit 2's the one end that is close to fingerprint identification module 5 is equipped with bending region 206, has formed the accommodation space 7 that is used for holding fingerprint identification module 5 between bending region 206 and the display module assembly 1, and fingerprint identification module 5 is arranged in accommodation space 7.
In this embodiment, as shown in fig. 1 to 3, one end of the backlight module 2 close to the fingerprint identification module 5 is bent and forms an accommodating space 7 with the display module 1, so that the fingerprint identification module 5 is located in the accommodating space 7; when fingerprint identification module 5 is located accommodation space 7, fingerprint identification module 5 is located display module 1 under on backlight unit 2, when carrying out fingerprint identification, the probe light that fingerprint identification module 5 sent, and through display module 1 go up the probe light of finger reflection in the fingerprint detection area 106 all need not to pass backlight unit 2, thereby solved for realizing fingerprint identification under the LCD optical screen, carry out fingerprint identification's probe light, and through display module 1 go up the probe light of finger reflection in the fingerprint detection area 106 can't pierce through backlight unit 2, so that the problem of the optical signal detection return circuit of fingerprint under the formation optical screen, and then under the prerequisite that does not change backlight film material, this embodiment can guarantee display module 1's display effect through changing backlight unit 2's structure when having realized fingerprint identification under the LCD optical screen.
It should be understood, in this embodiment, when fingerprint identification module 5 is located accommodation space 7, fingerprint identification module 5 is located display module 1 below on backlight unit 2, consequently, when needs discern the fingerprint, the probing light that fingerprint identification module 5 sent can see through display module 1 direct irradiation to the finger in fingerprint detection area 106 and by the finger reflection, the probing light that carries fingerprint information after the finger reflection sees through display module 1 and carries out data processing with fingerprint information transmission to fingerprint identification module 5, and then realizes fingerprint identification. Because when fingerprint identification module 5 is located accommodation space 7, fingerprint identification module 5 is located display module 1 under on backlight unit 2, therefore, the detecting light, and the detecting light that carries fingerprint information after the finger reflection all need not to pierce through backlight unit 2, not only form the light signal detection return circuit of fingerprint under the optical screen, the discernment of optical fingerprint under the screen has been realized, and to light path processing unit 501's interference when can avoiding piercing through backlight unit 2, wherein, light path processing unit 501 is including detecting light and through the detecting light of finger reflection, the influence to the fingerprint identification image has been avoided, the degree of accuracy of fingerprint identification has been improved.
In this embodiment, the detection light emitted by the fingerprint identification module 5 is light with a wavelength range outside the visible light wavelength, wherein the detection light includes but is not limited to infrared light. Therefore, by utilizing the different characteristics of visible light and infrared light in various film materials, the backlight homogenization can be ensured, the light distortion of the fingerprint signal is small, and the high fingerprint identification accuracy is ensured.
Because accommodation space 7's size depends on fingerprint identification module 5's structural dimension, consequently, do not further inject to accommodation space 7's size in this embodiment, only need guarantee to buckle the accommodation space 7 that forms between regional 206 and the display module assembly 1, can will satisfy fingerprint identification module 5 and place in accommodation space 7, and can guarantee display module assembly 1's display effect when having realized fingerprint identification under the LCD optical screen can.
In this embodiment, as shown in fig. 1 and fig. 2, the backlight module 2 is bent toward a side away from the display module 1 to form a bending region 206, wherein the fingerprint identification module 5 can be completely placed in the formed accommodating space 7 and optical fingerprint identification under the screen is realized, and in order to satisfy the display effect of the backlight source 205 on the display module 1, which is emitted by the backlight module 2, as much as possible, the smaller the bending angle of the bending region 206 is, the better. It should be noted that the display effect includes, but is not limited to, uniformity of display brightness.
In a possible implementation manner, as shown in fig. 1 and fig. 2, the width of the bending region 206 is equal to the width of the backlight module 2, that is, the bending region 206 is a side of the backlight module 2 close to the fingerprint identification module 5 and is integrally bent toward the display module 1, so as to form the bending region 206, and an accommodating space 7 for accommodating the fingerprint identification module 5 is formed between the bending region 206 and the display module 1.
In another possible implementation manner, the width of the bending region 206 is smaller than the width of the backlight module 2, that is, the bending region 206 is a side of the backlight module 2 close to the fingerprint identification module 5 and is partially bent toward the side away from the display module 1, so as to form the bending region 206, and an accommodating space 7 for accommodating the fingerprint identification module 5 is formed between the bending region 206 and the display module 1. Wherein, in this embodiment, backlight unit 2 is close to the one end of fingerprint identification module 5 and takes place the regional central point that can be located backlight unit 2 that partially buckles, also can be located backlight unit 2's eccentric position, wherein, eccentric position can understand the central point that the regional deviation backlight unit 2 that takes place partially to buckle, in this embodiment, take place the regional further not injecing of partially buckling to backlight unit 2, this embodiment, only need guarantee, when fingerprint identification module 5 is located the accommodation space 7 that takes place to form between regional and the display module 1 that partially buckles, when having realized the discernment of fingerprint under the LCD optical screen, can guarantee display module 1's display effect can.
In this embodiment, the fingerprint detection area 106 may be located in the central area of the accommodating space 7, or may be disposed away from the central area of the accommodating space 7, which is not further limited in this embodiment. It can be understood that, when the position of fingerprint identification module 5 changes, it is corresponding, corresponding change also can take place for the position of fingerprint detection area 106 on the display module assembly 1, in this embodiment, only need guarantee, fingerprint detection area 106 and fingerprint identification module 5's relative setting, can realize under the screen fingerprint identification can.
In this embodiment, the backlight module 2 and the fingerprint identification module 5 are both fixed on one side of the lower polarizer 103 of the display module 1 facing the backlight module 2.
Specifically, in the present embodiment, the display module 1 includes a display cover 101 and a liquid crystal panel 102 disposed below the display cover 101, wherein the lower polarizer 103 is a portion of the liquid crystal panel 102 and is disposed at a bottom layer of the liquid crystal panel 102, that is, the lower polarizer 103 is disposed on the liquid crystal panel 102 near the backlight module 2. Since the liquid crystal panel is a conventional technology, in the present embodiment, the structure of the liquid crystal panel 102 is not further described.
As shown in fig. 1, in order to avoid the battery accommodating cavity 10 inside the electronic device installed with the display device of the present embodiment, the distance between the bending point of the bending region 206 and the end of the backlight module 2 near the end of the fingerprint identification module 5 is less than 40mm, so as to ensure that the fingerprint identification module 5 can be placed in the accommodating space 7 while avoiding the battery accommodating cavity 10, and avoid the influence of the bending of the backlight module 2 on the battery accommodating cavity 10, so as to meet the requirement of the electronic device on the large capacity of the battery.
It should be noted that, in combination with the size relationship between the electronic device and the battery accommodating cavity 10 in the prior art, when the distance between the bending point and the end of the backlight module 2 close to the fingerprint identification module 5 is less than 40mm, the bending point and the bending region 206 both avoid the battery accommodating cavity 10 of the electronic device.
It should be noted that, in the prior art, the distance between the edge of the end close to the end of the fingerprint identification module 5 of the battery accommodation chamber 10 and the end of the backlight module 2 close to the end of the fingerprint identification module 5 is greater than or equal to 40mm, therefore, when the distance between the bending point and the end of the backlight module 2 close to the end of the fingerprint identification module 5 in this embodiment is less than 40mm, the battery accommodation chamber 10 of the electronic device can be avoided by the bending point and the bending area 206, so as to satisfy the requirement of the electronic device for the large capacity of the battery.
As shown in fig. 1, in order to reduce the thickness increase of the electronic device caused by the bending region 206 of the backlight module 2 as much as possible, the bending region 206 is required to fully place the fingerprint identification module 5 in the formed accommodating space 7 and realize the optical fingerprint identification under the screen, and in order to satisfy the display effect of the backlight source 205 emitted by the backlight module 2 on the display module 1 as much as possible, the smaller the bending angle of the bending region 206 is, the better. In this embodiment, the bending angle of the bending region 206 is preferably less than 7 °.
As shown in fig. 1, in order to improve the display effect of the display module 1, one end of the backlight module 2 away from the fingerprint identification module 5 is a flat region 207, and the flat region 207 is smoothly connected to the bending region 206.
In this embodiment, as shown in fig. 1, the smooth connection between the flat region 207 and the bent region may be a rounded transition connection, or may be a rounded structure for smooth connection, that is, the smooth connection between the flat region 207 and the bent region in this embodiment includes but is not limited to a rounded transition connection. In this embodiment, preferably, the smooth connection between the straight region 207 and the bent region is a rounded transitional connection with a radius greater than 5 mm.
It should be noted that, in the embodiment, as shown in fig. 1, the bending angle is an included angle between the bending region 206 of the backlight module 2 and an extension of the flat region 207 toward one end of the fingerprint identification module 5.
As shown in fig. 1 to fig. 3, in order to make the backlight module 2 close to the end of the fingerprint identification module 5, the bending region 206 of the present invention is formed, the backlight module 2 is fixed on the fixing member 9, and the backlight module 2 is fixed under the display module 1 through the fixing member 9, so as to fix the backlight module 2 and the fixing member 9.
It should be noted that, in this embodiment, as shown in fig. 1 to fig. 3, one end of the fixing member 9 close to the fingerprint identification module 5 is bent towards one side departing from the display module 1 to form a first bending portion 907, and one end of the fixing member 9 far away from the fingerprint identification module 5 is a horizontal portion, and the backlight module 2 is fixed in the fixing member 9 so that one end of the backlight module 2 close to the fingerprint identification module 5 forms the bending region 206. It should be noted that, in the present embodiment, the structure of the first bending portion 907 is matched with the structure of the bending region 206, specifically, the bending point and the bending angle of the first bending portion 907 are the same as the bending point and the bending angle of the bending region 206, which is specifically described in the description of the bending point and the bending angle of the backlight module 2, and further description of the bending point and the bending angle of the fixing element 9 in the present embodiment is not repeated.
Specifically, in this embodiment, as shown in fig. 1 to 3, the fixing member 9 includes: the backlight module holder comprises a holder body 901 in a frame shape, and a first supporting portion 902 for fixing the backlight module 2, wherein the first supporting portion 902 is disposed on an inner sidewall of the holder body 901 to fix the backlight module 2 in the holder body 901.
For example, as shown in fig. 1 to fig. 3, the fixing body 901 having a frame shape, that is, the fixing member 9 has a frame shape, that is, the fixing body 901 has a frame structure, and the first supporting portion 902 is disposed on an inner side wall of the frame structure to fix the backlight module 2 in the frame structure. In this embodiment, the bottom of the fixing body 901 is a solid plate-shaped structure, and the plate-shaped structure is located at the bottom of the backlight module 2, so that the backlight module 2 is opaque; alternatively, the bottom of the fixture body 901 is a hollow structure, and the backlight module 2 is fixed in the frame structure of the fixture body 901.
Further, as shown in fig. 1 to 3, the fixing member 9 further includes: and a second support portion 903 for fixing the bending region 206, wherein the bending region 206 is fixed on the display module 1 through the second support portion 903.
In this embodiment, as shown in fig. 1 to fig. 3, the second supporting portion 903 is located on a side wall of the fixing element body 901 close to one end of the bending region 206, that is, the second supporting portion 903 is located on a side wall of a frame structure of the fixing element body 901 close to one end of the bending region 206, wherein the second supporting portion 903 is higher than the frame structure of the fixing element body 901, so as to set the fingerprint identification module 5 in the accommodating space 7, and the bending region 206 is fixed on the display module 1 through the second supporting portion 903.
In this embodiment, as shown in fig. 1 to fig. 3, the second supporting portion 903 is higher than the first supporting portion 902, and one side edge of the first supporting portion 902 close to the backlight module 2 is exposed to the second supporting portion 903, so that the bending region 206 is fixed on the display module 1 through the second supporting portion 903, the backlight module 2 is fixed in the frame structure through the first supporting portion 902, and the fixing member 9 forms a good seal between the display module 1 and the backlight module 2, so as to prevent the foreign matter pollution from affecting the imaging quality during the fingerprint identification and the display effect of the display module 1.
As shown in fig. 1 to 3, in order to fix the backlight module 2 and the bending region 206 better, the first supporting portion 902 and the second supporting portion 903 are both stepped to increase the contact area between the first supporting portion 902 and the display module 1, and between the second supporting portion 903 and the display module 1 and the backlight module 2, so as to enhance the fixing effect on the backlight module 2 and the bending region 206.
It should be understood that, as shown in fig. 3, the step is a protruding structure with a flat top in the prior art, and in this embodiment, further description on the step is not repeated.
For example, in the present embodiment, as shown in fig. 3, the backlight module 2 is adhered to the first supporting portion 902 through a first light shielding adhesive 3, and the bending region 206 is adhered to a side of the display module 1 close to the backlight module 2 through a second light shielding adhesive 4.
When the backlight module 2 is fixed on the first supporting portion 902 in the fixing member body 901, one side of the backlight module 2 close to the display module 1 is flush with the surface of the first supporting portion 902, or one side of the backlight module 2 close to the display module 1 is higher than the surface of the first supporting portion 902, at least part of the first shading glue 3 is pasted on the surface of the first supporting portion 902, one side of the backlight module 2 close to the display module 1 and the surface of the first supporting portion 902 are fixed, and the backlight module 2 can be further fixed in the fixing member body 901. Since the first light shielding adhesive 3 is at least partially fixed at the joint between the backlight module 2 and the surface of the first supporting portion 902, the shape of the first light shielding adhesive 3 is a square structure; correspondingly, since the second supporting portion 903 is located on the side wall of the fixing body 901 close to one end of the bending region 206, and the second supporting portion 903 is bonded to the display module 1 through the second light shielding adhesive 4, the shape of the second light shielding adhesive 4 is matched with the structure of the second supporting portion 903, and preferably, the second light shielding adhesive 4 is in a "U" shape.
It should be noted that the first light-shielding glue 3 and the second light-shielding glue 4 are the same light-shielding glue in the prior art, the first and the second light-shielding glue in this embodiment are only used for distinguishing light-shielding glue at different positions, and further details of the components of the light-shielding glue are not further described in this embodiment.
Specifically, in order to avoid the influence on the display area 104 of the display module 1 caused by the arrangement of the first shading glue 3 and the second shading glue 4, a safety distance is arranged between the first shading glue 3 and the second shading glue 4 and the display area 104 of the display module 1, wherein the safety distance is greater than 0.2 mm.
In this embodiment, as shown in fig. 1 and fig. 3, the fixing member 9 is an iron frame or an integrated frame of rubber and iron, wherein in this embodiment, the integrated frame of rubber and iron is a commonly used frame fixing member 9 in the prior art, and an integrated structure is formed by injection molding the rubber frame 905 on the inner side wall of the iron frame 904, so as to improve the strength of the product fixed thereon.
In the embodiment of the utility model, one end of the backlight module close to the fingerprint identification module is bent and forms a containing space with the display module, so that the fingerprint identification module is positioned in the containing space; when the fingerprint identification module was located accommodation space, the fingerprint identification module was located backlight unit, when carrying out fingerprint identification, the detecting light that the fingerprint identification module sent and the detecting light of finger reflex all need not to pass backlight unit on the display module to solved current backlight membrane material and can't satisfy fingerprint formation of image and screen display's requirement simultaneously, so that can't realize the problem of fingerprint identification under the LCD optical screen.
Example two
Fig. 4 is a schematic structural diagram of a backlight module according to a second embodiment of the present invention.
Further, on the basis of the first embodiment, as shown in fig. 4, the backlight module 2 in this embodiment includes a brightness enhancement film 201, a diffusion film 202, a light guide plate 203, and a reflection film 204 stacked in sequence, wherein the brightness enhancement film 201 is close to one side of the display module 1, and the reflection film 204 is disposed away from one side of the display module 1.
In this embodiment, the reflective film 204 is used to reflect the light source into the light guide plate 203, so as to improve the utilization rate of the light source. The light guide plate 203 is used for guiding the scattering direction of the light source, so as to improve the brightness of the display module 1 and ensure the uniformity of the brightness of the display module 1. The diffusion film 202 serves to convert the non-uniform light source emitted from the light guide plate 203 into a uniform light source diverging to various angles. The brightness enhancement film 201 is disposed between the diffuser film 202 and the display module 1 for improving the angular distribution of the light sources, and can converge the light sources emitted from the diffuser film 202 and uniformly diverging to various angles to the axial angle, thereby improving the axial brightness without increasing the total light flux emitted.
The brightness enhancement film 201 may be a single layer prism film, a double layer prism film or a brightness enhancement film 201 without a prism structure, and the structure of the brightness enhancement film 201 is not further limited in this embodiment.
Further, as shown in fig. 4, the light guide plate 203 is provided with light guide particles, the light guide particles form light guide points on the light guide plate 203, when visible light irradiates each light guide point, light can be diffused towards each angle, then reflection conditions are destroyed to be emitted from the front surface of the light guide plate 203, the display module 1 is illuminated, and it is ensured that the backlight module 2 can normally provide backlight.
As shown in fig. 4, since the light guide plate 203 has a larger thickness than other backlight film materials, in order to make the light guide plate 203 fit with the first bending portion 907 and the horizontal portion of the fixing member 9 in the fixing member 9 to form the bending region 206 of the backlight module 2, a second bending portion 2031 matched with the structure of the bending region 206 is disposed at one end of the light guide plate 203 close to the fingerprint identification module 5, wherein the bending point and the bending angle of the second bending portion 2031 are the same as those of the first bending portion 907, and in this embodiment, further description on the bending point and the bending angle of the second bending portion 2031 is omitted.
In this embodiment, as shown in fig. 4, the uniformity of the visible light emitted from the backlight module 2 by the light guide plate 203 is greater than 90%.
Specifically, in this embodiment, the particle size of the light guide particles on the second bending portion 2031 and the density of the light guide particles on the second bending portion 2031 can be adjusted, so that the uniformity of the brightness of the visible light emitted by the backlight module 2 by the light guide plate 203 is greater than 90%, or in this embodiment, the uniformity of the brightness of the visible light emitted by the backlight module 2 by the light guide plate 203 after the second bending portion 2031 is formed after bending is greater than 90% by screening from the light guide plate 203 in the prior art.
For example, the light guide particles may be any of the fine particles in the prior art, such as plastic particles or highly reflective materials, which can change light and diffuse light to various angles.
In this embodiment, the brightness enhancement film 201, the diffusion film 202, and the reflection film 204 are fixed in the fixing member 9, and the brightness enhancement film 201, the diffusion film 202, and the reflection film 204 are bent naturally in the fixing member 9 by the fixing member 9.
It should be noted that, the embodiment is through bending the backlight unit 2 towards one side that deviates from display module 1 and forming the cost utility model discloses a region 206 of buckling to make form fingerprint identification module 5's accommodation space 7 between backlight unit 2 and the display module 1, when not only realizing fingerprint identification under the screen, can satisfy display module 1's display effect, and the material of volume production has now been utilized to this embodiment, like brightness enhancement film 201, diffusion barrier 202, light guide plate 203 and reflectance coating 204, need not to carry out specific development to every lamellar structure in backlight unit 2, thereby overcome the material development cycle length, problem with high costs.
Further, as shown in fig. 4, the backlight module 2 further includes: backlight 205 and flexible circuit board 6, backlight 205 is located backlight unit 2 and is close to the one end tip of fingerprint identification module 5, and it provides visible light for display module 1 to make display module 1 display the picture. The flexible circuit board 6 is used for providing electric energy for the backlight source 205, and the flexible circuit board 6 is located at one side of the backlight source 205 close to the display module 1 and is fixed on the first supporting portion 902 through the first light shielding glue 3.
It should be noted that, according to different needs, the backlight light source 205 may adopt different light sources as the backlight light source 205. For example, a bulb, etc., as long as it is ensured that the backlight light source 205 can emit visible light.
In addition, in the present embodiment, the backlight module 2 is used for making the light emitted from the point light source or the line light source become a surface light source through diffuse reflection, so that the display module 1 displays a picture.
In order to facilitate the wire outgoing of the flexible circuit board 6, as shown in fig. 3, at least one wire outgoing slot 906 is formed at an end of the fixing member 9 close to the fingerprint identification module 5, so that the flexible circuit board 6 of the backlight module 2 and the fingerprint identification module 5 is led out through the wire outgoing slot 906.
EXAMPLE III
Further, on the basis of the first and second embodiments, in order to avoid the shielding of the backlight module 2 by the fingerprint identification module 5, as shown in fig. 1, a gap exists between the bending region 206 and the effective optical path region 503 of the fingerprint identification module 5, wherein the effective optical path region 503 is a maximum region formed by the detection light of the fingerprint identification module 5 and the detection light reflected by the finger and entering the fingerprint identification module 5.
It should be noted that, the effective light path region 503 through at bending region 206 and fingerprint identification module 5 in this embodiment sets up the clearance to avoid the shielding of the visible light that fingerprint identification module 5 sent backlight unit 2, when guaranteeing fingerprint identification under the screen, can satisfy the demonstration requirement of display module 1. Wherein, the clearance between the effective light path district 503 of bending region 206 and fingerprint identification module 5 is for the safe distance that can avoid the sheltering from of fingerprint identification module 5 to the visible light that backlight unit 2 sent.
In this embodiment, preferably, the gap is greater than 0.3mm, that is, when the gap between the bending region 206 and the effective light path region 503 of the fingerprint identification module 5 is greater than 0.3mm, the shielding of the fingerprint identification module 5 on the visible light emitted by the backlight module 2 can be avoided.
Example four
Fig. 5 is a schematic structural diagram of a fingerprint identification module according to a fourth embodiment of the present invention.
Furthermore, on the basis of the above embodiment, in order to avoid the thickness of the whole electronic device being too large after the backlight module 2 is bent, in this embodiment, the fingerprint identification module 5 includes a light path processing unit therein, and the light path processing unit is used for reducing the thickness of the fingerprint identification module 5, which is helpful for the whole electronic device to be light and thin.
Referring to fig. 5, in the present embodiment, the optical path processing unit includes an optical element 5011, a reflective element 5012, and a sensor 5013 for fingerprint recognition, wherein the reflective element 5012 is located below the sensor 5013, the optical element 5011 is located on the same side of the reflective element 5012 and the sensor 5013 and is disposed close to the fingerprint detection area 106 on the display module 1, and the optical element 5011 is used for converging the detection light passing through the display module 1 onto the reflective element 5012 and reflecting the detection light to the sensor 5013 through the reflective element 5012 for fingerprint recognition.
The optical element 5011 may include a macro lens having at least one spherical or aspheric lens, and other optical elements 5011 capable of converging the detection light passing through the display module onto the reflective element 5012, that is, the optical element 5011 includes but is not limited to a macro lens having at least one spherical or aspheric lens. Among them, at least one lens may be formed of a resin material or a glass material, for condensing the detection light passing through the display module onto the reflective element 5012 and reflecting to the sensor 5013 through the reflective element 5012 for fingerprint recognition.
In this embodiment, the sensor 5013 for fingerprint recognition may also be referred to as an optical sensor 5013, an image sensor 5013, an optical fingerprint sensor 5013, an optical sensor, a fingerprint detection sensor, or the like, and may specifically include an optical imaging chip, or an optical imaging chip having a certain optical stack, which has a sensing array for receiving fingerprint detection light and performing photoelectric conversion on the fingerprint detection light.
In this embodiment, the reflective element 5012 may be a mirror capable of reflecting the detection light or other reflective elements capable of reflecting the detection light to the sensor 5013, that is, the reflective element 5012 in this embodiment includes but is not limited to the aforementioned mirror.
Compared with the prior art in which the optical element 5011 is disposed above the sensor 5013, referring to fig. 5, the embodiment can reduce the thickness (i.e., height) of the fingerprint recognition module 5 and facilitate the overall electronic device to be lighter and thinner while implementing fingerprint recognition by disposing the optical element 5011 at one side of the sensor 5013 and reflecting the detection light converged by the optical element 5011 onto the sensor 5013 through the reflecting element 5012. Compared with the prior art in which the optical element 5011 is disposed above the sensor 5013, the thickness of the fingerprint recognition module 5 in the present embodiment is reduced by 3mm to 4 mm.
Specifically, in this embodiment, referring to fig. 5, the fingerprint identification module 5 further includes a detection light source 502 for emitting a detection light onto a finger above the fingerprint detection area 106, and the detection light source 502 is located above the sensor 5013.
One or more detection light sources 502 may be disposed in the fingerprint identification module 5, and the detection light source 502 may be a point-shaped detection light source, or the detection light source 502 may be a linear detection light source formed by a plurality of detection light sources 502. The detection light source 502 may be an infrared light source or other invisible light capable of realizing fingerprint identification, and correspondingly, the detection light emitted by the detection light source 502 is also infrared light.
For example, the detection light source 502 may be an infrared light source such as an infrared lamp, an infrared Vertical Cavity Surface Emitting Laser (VCSEL), or an infrared Laser Diode (Laser Diode). The detection light source 502 may emit detection light in a spectral range of 780nm to 1100 nm. Preferably, it may be 850nm or 940nm, etc.
Further, referring to fig. 5, the fingerprint identification module 5 further includes a first bracket 505 for fixing and accommodating the detection light source 502, a first windowing structure 5051 is disposed above the first bracket 505 and the detection light source 502, the detection light source 502 emits the detection light to the fingerprint detection area 106 through the first windowing structure 5051, and the detection light source 502 is fixed by the first bracket 505 while leakage of the detection light emitted by the detection light source 502 can be avoided. Wherein, the detection light source 502 is welded or adhered in the first bracket 505 and is spaced apart from the bottom of the display module 1.
It should be noted that the shape and size of the opening of the first windowing structure 5051 can substantially allow the detection light emitted by the detection light source 502 to pass therethrough, so as to avoid the influence on the fingerprint identification due to the detection light emitted by the detection light source 502 not normally passing through the first bracket 505.
In order to fix the optical element 5011 and the sensor 5013, referring to fig. 5, the optical element 5011 and the sensor 5013 are attached to the bottom of the first bracket 505, wherein the attaching manner of the optical element 5011 and the sensor 5013 to the bottom of the first bracket 505 includes, but is not limited to, welding or bonding.
In order to protect the optical path processing unit, referring to fig. 5, the fingerprint identification module 5 further includes a second bracket 506 for protecting the optical path processing unit, and a receiving cavity (not shown) for receiving the optical path processing unit is disposed in the second bracket 506, wherein the second bracket 506 is provided with a second window structure (not shown) at a position opposite to the optical element 5011, and the second window structure is used for transmitting the detection light passing through the display module 1 to the sensor 5013 so as to realize fingerprint identification.
It should be noted that the shape and size of the opening of the second opening structure can satisfy that the detection light passing through the display module 1 can be transmitted basically, so as to avoid the influence on the reception of the fingerprint image due to the fact that the detection light carrying the fingerprint information and passing through the display module 1 cannot normally pass through the second bracket 506. In this embodiment, the size of the second windowing structure is based on the receiving optical path of the optical element 5011.
Further, as shown with reference to fig. 5, a gap is provided between the reflecting member 5012 and the sensor 5013 so that the sensor 5013 receives the detection light carrying the fingerprint information after being reflected by the reflecting member 5012.
Specifically, in this embodiment, the reflective element 5012 may be attached to a protrusion (not shown) on the sensor 5013 to adjust the distance between the sensor 5013 and the reflective element 5012 by adjusting the height of the protrusion, or the reflective element 5012 may be disposed on the bottom of the second bracket 506 to adjust the distance between the sensor 5013 and the reflective element 5012 by controlling the distance between the bottom of the second bracket 506 and the sensor 5013.
EXAMPLE five
On the basis of the fourth embodiment, the embodiment of the present invention provides a fingerprint identification module 5 suitable for a liquid crystal display, wherein a bending region 206 is disposed at one end of a backlight module 2 of the liquid crystal display and forms an accommodating space 7 with a display module 1, a fingerprint detection region 106 of the fingerprint identification module 5 is at least partially located in a display region 104 of the liquid crystal display, and it includes an optical element 5011 accommodated in the accommodation space 7, a reflecting element 5012 and a sensor 5013 for fingerprint recognition, the optical element 5011 is located on the same side of the reflective element 5012 and the sensor 5013 and is close to the fingerprint detection area 106 of the liquid crystal display, the optical element 5011 is used for collecting detection light which is formed by a finger above the liquid crystal display and passes through the display module 1 onto the reflective element 5012, the reflective element 5012 is used for reflecting the detection light to the sensor 5013, and the sensor 5013 is used for receiving the detection light to perform fingerprint identification.
One end of the backlight module 2 close to the fingerprint identification module 5 is bent and forms an accommodating space 7 with the display module 1, so that the fingerprint identification module 5 is located in the accommodating space 7; when fingerprint identification module 5 is located accommodation space 7, fingerprint identification module 5 is located display module 1 under on backlight unit 2, when carrying out fingerprint identification, the probe light that fingerprint identification module 5 sent, and through display module 1 go up the probe light of finger reflection in the fingerprint detection area 106 all need not to pass backlight unit 2, thereby solved for realizing fingerprint identification under the LCD optical screen, carry out fingerprint identification's probe light, and through display module 1 go up the probe light of finger reflection in the fingerprint detection area 106 can't pierce through backlight unit 2, so that the problem of the optical signal detection return circuit of fingerprint under the formation optical screen, and then under the prerequisite that does not change backlight film material, this embodiment can guarantee display module 1's display effect through changing backlight unit 2's structure when having realized fingerprint identification under the LCD optical screen.
Because accommodation space 7's size depends on fingerprint identification module 5's structural dimension, consequently, do not further inject to accommodation space 7's size in this embodiment, only need guarantee to buckle the accommodation space 7 that forms between regional 206 and the display module assembly 1, can will satisfy fingerprint identification module 5 and place in accommodation space 7, and can guarantee display module assembly 1's display effect when having realized fingerprint identification under the LCD optical screen can.
The detection light is different from the backlight wavelength provided by the backlight module of the liquid crystal display screen, and the detection light emitted by the grain identification module 5 is light with a wavelength range outside the visible light wavelength, wherein the detection light includes but is not limited to infrared light. Therefore, by utilizing the different characteristics of visible light and infrared light in various film materials, the backlight homogenization can be ensured, the light distortion of the fingerprint signal is small, and the high fingerprint identification accuracy is ensured.
It should be noted that, in the present embodiment, reference may be made to the description of the fingerprint identification module 5 in the fourth embodiment, and in the present embodiment, no further description is made on the structure of the fingerprint identification module 5.
EXAMPLE six
Fig. 6 is an exploded schematic view of a fingerprint identification system of a liquid crystal display provided by the embodiment of the present invention.
Further, on the basis of the above embodiment, referring to fig. 6, in this embodiment, the third bracket 8 is filled in the gap between the two sides of the fingerprint identification module 5, so as to avoid the abrupt feeling of the fingerprint identification module 5 during the observation at a large angle, thereby improving the display effect.
Third support 8 distributes in the both sides clearance of fingerprint identification module 5 to it is further spacing to carry out fingerprint identification module 5, if remove along the direction that parallels with backlight unit 2 or display module assembly 1 width through third support 8 restriction fingerprint identification module 5.
Specifically, third support 8 can be fixed in 5 both sides of fingerprint identification module through bonding or joint for fill the clearance of 5 both sides of fingerprint identification module in accommodation space 7, when avoiding the wide-angle observation, eliminate fingerprint identification module 5's abrupt sensation, and then promote the display effect. In this embodiment, set up third support 8 through the clearance in fingerprint identification module 5 both sides, consequently, when the user wide-angle is observed, what see is third support 8 and fingerprint identification module 5.
It should be noted that, in this embodiment, the observation at a large angle refers to observing from the direction that one end of display module 1 deviates from fingerprint identification module 5 is close to the one end of fingerprint identification module 5 towards display module 1, namely observing from the top of display module 1 towards the bottom of display module 1.
In this embodiment, the structure of the third bracket 8 is adapted to the structure of the first bending portion 907 of the fixing member 9, and preferably, the third bracket 8 is an L-shaped structure adapted to the structure of the first bending portion 907 of the fixing member 9. In this embodiment, the third bracket 8 may be made of a black plastic material, or the third bracket 8 may also be made of a black metal material, and in this embodiment, the structure and the material of the third bracket 8 are not further limited.
EXAMPLE seven
Fig. 7 is a schematic structural diagram of a display module assembly according to a seventh embodiment of the present invention, fig. 8 is a schematic structural diagram of another display module assembly according to a seventh embodiment of the present invention, and fig. 9 is a partial schematic diagram of another display module assembly according to a seventh embodiment of the present invention.
Further, on the basis of the above embodiments, as shown in fig. 7 to fig. 9, an embodiment of the present invention provides an electronic device, which includes the liquid crystal display fingerprint identification system in any of the above embodiments. The electronic device includes the off-screen optical fingerprint system in any of the above embodiments, and the electronic device may be an electronic product or a component such as a liquid crystal display device, electronic paper, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator, a fingerprint lock, and the like.
In this embodiment, the electronic device is provided with a battery accommodating cavity 10, and a distance exists between the bending point of the bending region 206 and the battery accommodating cavity 10 in order to avoid the battery accommodating cavity 10.
Specific, the distance that kink and backlight unit 2 are close to 5 one end tip of fingerprint identification module is less than 40mm to when guaranteeing to place fingerprint identification module 5 in accommodation space 7, can avoid the battery to hold chamber 10, avoid backlight unit 2 buckle to hold the influence that chamber 10 caused to the battery, in order to satisfy the demand of electron device to the battery large capacity.
In order to reduce the thickness increase of the electronic device caused by the bending region 206 of the backlight module 2 as much as possible, the bending region 206 can be fully placed in the formed accommodating space 7 with the fingerprint identification module 5 and realize optical fingerprint identification under the screen, and in order to satisfy the display effect of the backlight source 205 on the display module 1 sent by the backlight module 2 as much as possible, the smaller the bending angle of the bending region 206 is, the better. The bend angle of bend region 206 is less than 7 °. As shown in fig. 1, the bending angle is an angle between the bending region 206 of the backlight module 2 and an extension of the flat region 207 toward an end of the fingerprint identification module 5.
In order not to increase the width of the black edge of the electronic device, in this embodiment, the fingerprint identification module 5 is disposed below the non-display area 105 of the display module 1 to satisfy the high screen ratio of the electronic device.
As shown in fig. 1, the display module 1 includes a display cover 101 and a liquid crystal panel 102 disposed below the display cover 101. As shown in fig. 1 and fig. 6 to 8, in this embodiment, the periphery of one side of the display cover plate 101 close to the backlight module 2 is silk-screened with the infrared-transmitting ink 107, an orthographic projection area of the infrared-transmitting ink 107 on the display cover plate 101 is a non-display area 105 of the display module 1, and correspondingly, an area outside the non-display area 105 on the display module 1 is a display area 104 on the display module 1.
Among them, in this embodiment, as shown in fig. 7 to fig. 9, fingerprint detection area 106 on display module assembly 1 is located display area 104 at least partially, that is to say, fingerprint detection area 106 is located display area 104 partially, or fingerprint detection area 106 is located display area 104 completely, and in this embodiment, do not further limit to the position of fingerprint detection area 106, and in this embodiment, only need guarantee that setting up of fingerprint detection area 106 can realize fingerprint identification under the screen.
As shown in fig. 9, because the detection light that the fingerprint identification module sent need to see through display module 1, and the detection light that carries fingerprint information through finger reflection need to see through display module 1 and transmit to fingerprint identification module 5, in order to improve the transmissivity of detection light, in this embodiment, the range that shows that the infrared ink that passes through of the corresponding position in effective light path region 503 region of apron 101 and fingerprint identification module 5 is regional 108 need be greater than the luminous region 504 of detection light source of fingerprint identification module 5, with the loss that reduces detection light in the light path transmission, improve fingerprint identification's accuracy. The infrared-transparent ink area 108 is an area formed by the display cover 102 and the infrared-transparent ink. The display cover 101 includes, but is not limited to, a glass cover.
As shown in fig. 1, in order to prevent the fingerprint recognition module 5 and the third bracket 8 from being observed from the front surface during the use of the electronic device, the range of the infrared-transparent ink area 108 corresponding to the fingerprint recognition module 5 and the third bracket 8 on the display cover 101 needs to be larger than the orthographic projection area of the fingerprint recognition module 5 and the third bracket 8 on the display cover 101. Preferably, a gap distance of more than 0.3mm exists between the edge of the orthographic projection area of the fingerprint identification module 5 and the third support 8 on the display cover 101 and the edge of the infrared-transmitting ink area 108 on the display cover 101 close to one end of the fingerprint identification module 5.
In the description of the present invention, it is to be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, an indirect connection via an intermediary, a connection between two elements, or an interaction between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically stated otherwise.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation 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.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (40)

1. The utility model provides a liquid crystal display fingerprint identification system, its characterized in that, includes display module assembly, backlight unit and fingerprint identification module, backlight unit is close to the one end of fingerprint identification module is equipped with the region of buckling, buckle regional with formed between the display module assembly and be used for holding the accommodation space of fingerprint identification module, the fingerprint identification module is located in the accommodation space.
2. The LCD fingerprint identification system of claim 1, wherein the backlight module is bent toward a side away from the display module to form the bent region.
3. The lcd fingerprint identification system of claim 1, wherein the width of the bending region is equal to the width of the backlight module.
4. The lcd fingerprint identification system of claim 1, wherein the width of the bending region is less than the width of the backlight module.
5. The LCD fingerprint identification system of any one of claims 1-4, wherein the distance between the bending point of the bending area and the end of the backlight module near the fingerprint identification module is less than 40 mm.
6. The LCD fingerprint identification system of claim 5, wherein the bending angle of the bending region is less than 7 °.
7. The LCD fingerprint identification system of claim 5, wherein one end of the backlight module facing away from the fingerprint identification module is a flat area, and the flat area is in smooth connection with the bent area.
8. The lcd fingerprint identification system of claim 1, wherein the backlight module is fixed to a fixture, the fixture comprising: the fixing piece body is in a frame shape, and the first supporting portion is used for fixing the backlight module, and the first supporting portion is arranged on the inner side wall of the fixing piece body so as to fix the backlight module in the fixing piece body.
9. The lcd fingerprint identification system of claim 8, wherein the holder further comprises: and the second supporting part is used for fixing the bending area, and the bending area is fixedly arranged on the display module through the second supporting part.
10. The lcd fingerprint identification system of claim 9, wherein the second support portion is located on a sidewall of the fixing member body near an end of the bending region.
11. The lcd fingerprint identification system of claim 10, wherein the second supporting portion is higher than the first supporting portion, and a side edge of the first supporting portion close to the backlight module is exposed to the second supporting portion.
12. The lcd fingerprint recognition system of claim 11, wherein the first support portion and the second support portion are both steps.
13. The system of any one of claims 8 to 12, wherein the backlight module is bonded to the first supporting portion by a first light-shielding adhesive, and the bending region is bonded to a side of the display module close to the backlight module by a second light-shielding adhesive.
14. The liquid crystal display fingerprint identification system of claim 13, wherein a safety distance is provided between each of the first light-shielding glue and the second light-shielding glue and a display area of the display module, wherein the safety distance is greater than 0.2 mm.
15. The lcd fingerprint identification system of any one of claims 8-12, wherein the fixture is an iron frame or a plastic-iron frame.
16. The lcd fingerprint identification system of claim 1, wherein the backlight module comprises: the display module comprises a brightening film, a diffusion film, a light guide plate and a reflecting film which are sequentially stacked, wherein the brightening film is close to one side of the display module, and the reflecting film is arranged on one side of the display module.
17. The system of claim 16, wherein a second bending portion is disposed at an end of the light guide plate close to the fingerprint recognition module and adapted to the bending region.
18. The lcd fingerprint identification system of claim 17, wherein the light guide plate has a uniformity of brightness of visible light of the backlight module of greater than 90%.
19. The system of claim 8, wherein the fixing member has at least one wire slot formed at an end thereof adjacent to the fingerprint identification module, so that the backlight module and the flexible printed circuit board of the fingerprint identification module are led out through the wire slot.
20. The LCD fingerprint identification system of any one of claims 1-4, wherein a gap exists between the bending region and an effective optical path region of the fingerprint identification module, wherein the effective optical path region is a maximum region formed by the detection light of the fingerprint identification module and the detection light reflected by a finger and entering the fingerprint identification module.
21. The lcd fingerprint identification system of claim 20, wherein the gap is greater than 0.3 mm.
22. The lcd fingerprint identification system of claim 1, wherein the fingerprint identification module comprises: and the light path processing unit is used for reducing the thickness of the fingerprint identification module.
23. The lcd fingerprint recognition system of claim 22, wherein the optical path processing unit comprises: optical element, reflection element to and be used for fingerprint identification's sensor, wherein, reflection element is located the below of sensor, optical element is located reflection element and the same one side of sensor and be close to fingerprint detection area on the display module assembly sets up, optical element is used for with passing through the detection light of display module assembly gathers on the reflection element, and the warp reflection element reflects to the sensor, in order to carry out fingerprint identification.
24. The lcd fingerprint identification system of claim 23, wherein the fingerprint identification module further comprises a detection light source for emitting the probe light to a finger above the fingerprint detection area, the detection light source being located above the sensor.
25. The lcd fingerprint identification system of claim 24, wherein the fingerprint identification module further comprises a first bracket for fixing and accommodating the detection light source, the first bracket is provided with a first window structure above the detection light source, and the detection light source emits the detection light to the fingerprint detection area through the first window structure.
26. The lcd fingerprint identification system of claim 25, wherein the optical element and the sensor are attached to the bottom of the first support.
27. The lcd fingerprint identification system of claim 23, wherein the fingerprint identification module further comprises a second bracket for protecting the optical path processing unit, and an accommodating space is provided in the second bracket for accommodating the optical path processing unit, wherein the second bracket is provided with a second window structure at a position opposite to the optical element, and the second window structure is used for transmitting the detection light passing through the display module to the sensor.
28. The lcd fingerprint identification system of claim 23, wherein a distance exists between the reflective element and the sensor, so that the sensor receives the detection light carrying fingerprint information after being reflected by the reflective element.
29. The lcd fingerprint identification system of claim 28, wherein the reflective element is attached to a raised structure on the sensor or is disposed on the bottom of the second support.
30. The LCD fingerprint identification system of any one of claims 1-4, wherein the gaps on both sides of the fingerprint identification module are further filled with a third bracket.
31. An electronic device, characterized in that the electronic device comprises a liquid crystal display fingerprint recognition system according to any one of the preceding claims 1 to 30.
32. The electronic device of claim 31, wherein a battery receiving cavity is formed in the electronic device, and a distance exists between a bending point of the bending region and the battery receiving cavity.
33. The electronic device of claim 32, wherein a distance between the bending point and an end of the backlight module near the fingerprint identification module is less than 40 mm.
34. The electronic device of claim 33, wherein the bend angle of the bend region is less than 7 °.
35. A fingerprint identification module suitable for a liquid crystal display screen is characterized in that one end of a backlight module of the liquid crystal display screen is provided with a bending area and forms an accommodating space with a display module, the fingerprint detection area of the fingerprint identification module is at least partially positioned in the display area of the liquid crystal display screen, and it includes an optical element accommodated in the accommodation space, a reflection element, and a sensor for fingerprint recognition, wherein the optical element is positioned on the same side of the reflecting element and the sensor and is close to the fingerprint detection area of the liquid crystal display screen, the optical element is used for converging detection light which is formed by fingers above the liquid crystal display screen and passes through the display module on the reflecting element, the reflection element is used for reflecting the detection light to the sensor, and the sensor is used for receiving the detection light for fingerprint identification.
36. The fingerprint identification module of claim 35, further comprising a detection light source for emitting the detection light to a finger above the fingerprint detection area, wherein the detection light source is located above the sensor, and the detection light has a different backlight wavelength from a backlight module of the liquid crystal display.
37. The fingerprint identification module of claim 36, further comprising a first bracket for fixing and accommodating the detection light source, wherein the first bracket is provided with a first window structure above the detection light source, and the detection light source emits the probe light to the fingerprint detection area through the first window structure.
38. The fingerprint identification module of claim 37 wherein the optical element and the fingerprint sensor are attached to the bottom of the first support.
39. The fingerprint identification module of claim 35, further comprising a second bracket for protecting the optical path processing unit, wherein the second bracket has a receiving space for receiving the optical path processing unit, and wherein the second bracket has a second window structure at a position opposite to the optical element, and the second window structure is configured to transmit the detection light passing through the display module to the sensor.
40. The fingerprint identification module of claim 39, wherein a gap is formed between the reflective element and the sensor, so that the sensor receives the detection light carrying fingerprint information after being reflected by the reflective element, and the reflective element is attached to a protruding structure on the sensor, or the reflective element is disposed at the bottom of the second support.
CN201921882551.XU 2019-11-04 2019-11-04 Liquid crystal display fingerprint identification system, electronic device and fingerprint identification module Active CN211348911U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111066028A (en) * 2019-11-04 2020-04-24 深圳市汇顶科技股份有限公司 Liquid crystal display fingerprint identification system, electronic device and fingerprint identification module
CN113838373A (en) * 2021-08-20 2021-12-24 京东方科技集团股份有限公司 Display panel, detection method and display device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111066028A (en) * 2019-11-04 2020-04-24 深圳市汇顶科技股份有限公司 Liquid crystal display fingerprint identification system, electronic device and fingerprint identification module
CN111066028B (en) * 2019-11-04 2023-09-08 深圳市汇顶科技股份有限公司 Fingerprint identification system of liquid crystal display screen, electronic device and fingerprint identification module
CN113838373A (en) * 2021-08-20 2021-12-24 京东方科技集团股份有限公司 Display panel, detection method and display device
CN113838373B (en) * 2021-08-20 2023-10-24 京东方科技集团股份有限公司 Display panel, detection method and display device

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