CN111325192A - Backlight module, display screen and electronic equipment - Google Patents

Abstract

The application discloses a backlight module, a display screen and an electronic device. The backlight module includes an optical film material and a backlight source, the optical film material is provided with a fingerprint signal conduction part, and the backlight source is fixed on the optical film. The edge of the film material, the backlight source is provided with a visible light lamp and a fingerprint detection signal source, the light of the visible light lamp is incident from the edge of the optical film material and exits from one side of the optical film material, and the fingerprint detection signal The fingerprint detection signal emitted by the source is incident from the edge of the optical film material, and is transmitted through the fingerprint signal transmission part, and then exits the visible light light from the optical film material. The fingerprint detection signal source is integrated in the backlight module, which effectively reduces the overall volume of the backlight module.

Description

Backlight modules, displays and electronic equipment

technical field

The present application relates to the field of communication equipment, and in particular, to a backlight module, a display screen and an electronic device.

Background technique

At present, the fingerprint recognition device of the mobile phone is set in the display screen. The fingerprint recognition device is often arranged on the back of the backlight module or on one side of the backlight module, which increases the thickness of the display screen, or increases the proportion of the non-display area of the display screen, resulting in a thick display screen or a poor screen ratio of the mobile phone. high.

SUMMARY OF THE INVENTION

The present application provides a backlight module, wherein the backlight module includes an optical film material and a backlight source, the optical film material is provided with a fingerprint signal conducting portion, and the backlight source is fixed on the edge of the optical film material, The backlight source is provided with a visible light lamp and a fingerprint detection signal source, the light of the visible light lamp is incident from the edge of the optical film material and exits from one side of the optical film material, and the fingerprint detected by the fingerprint detection signal source is detected. The signal is incident from the edge of the optical film material, and is transmitted through the fingerprint signal conducting part, and then exits the visible light beam from the optical film material.

The present application provides a backlight module, wherein the backlight module includes a light guide plate and a backlight source, the backlight source is fixed on the edge of the light guide plate, and the backlight source is provided with a visible light lamp and a fingerprint signal sensor, The light of the visible light lamp is incident from the edge of the light guide plate and exits from one side of the light guide plate, and the fingerprint signal sensor receives the fingerprint identification signal from the edge of the light guide plate.

The present application also provides a display screen, wherein the display screen includes the above-mentioned backlight module, and the display screen further includes a lower polarizer, a thin film transistor layer, a liquid crystal layer, a pixel layer, and a lower polarizer layered on the backlight module in sequence. Put the polarizer on.

The application also provides a display screen, wherein the display screen includes a display module and a backlight module, the backlight module includes a light guide plate and a backlight source, the light guide plate is provided with a fingerprint signal conduction part, and the backlight The source is fixed on the edge of the light guide plate, the backlight source is provided with a visible light lamp and a fingerprint detection signal source, the light of the visible light lamp is incident from the edge of the light guide plate and exits from one side of the light guide plate to the display module, the fingerprint detection signal emitted by the fingerprint detection signal source is incident from the edge of the light guide plate, and is transmitted from the light guide plate to the display module after being conducted by the fingerprint signal conduction part, and finally from the light guide plate. The display module is ejected.

The present application also provides an electronic device, wherein the electronic device is also the above-mentioned display screen.

In the backlight module, display screen and electronic equipment provided by the present application, a fingerprint detection signal source is provided through the backlight source, the backlight source is fixed on the edge of the optical film material, and the optical film material is provided with a fingerprint signal transmission part, After the fingerprint detection signal of the fingerprint detection signal source is incident on the optical film material, the visible light is emitted from the optical film material, so as to realize fingerprint detection, and the fingerprint detection signal source is integrated into the backlight. In the module, the overall volume of the backlight module is effectively reduced.

Description of drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings that need to be used in the implementation manner. As far as technical personnel are concerned, other drawings can also be obtained based on these drawings without any creative effort.

1 is a partial cross-sectional schematic diagram of a backlight module provided by an embodiment of the present application;

2 is another partial cross-sectional schematic diagram of the backlight module provided by the embodiment of the present application;

3 is a schematic cross-sectional view of a backlight module provided by an embodiment of the present application;

4 is a partial cross-sectional schematic diagram of a backlight module provided by another embodiment of the present application;

5 is a partial cross-sectional schematic diagram of a backlight module provided by another embodiment of the present application;

6 is a partial cross-sectional schematic diagram of a backlight module provided by another embodiment of the present application;

7 is a schematic cross-sectional view of a backlight module provided by another embodiment of the present application;

8 is a schematic cross-sectional view of a backlight module provided by another embodiment of the present application;

9 is a schematic cross-sectional view of a backlight module provided by another embodiment of the present application;

10 is a schematic cross-sectional view of a backlight module provided by another embodiment of the present application;

11 is a schematic cross-sectional view of a backlight module provided by another embodiment of the present application;

12 is a schematic cross-sectional view of a display screen provided by an embodiment of the present application;

13 is a schematic cross-sectional view of a display screen provided by another embodiment of the present application;

FIG. 14 is a schematic top view of an electronic device provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present application.

In the description of the embodiments of the present application, it should be understood that the orientation or positional relationship indicated by terms such as “thickness” is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, rather than implying Or indicating that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation on the present application.

Please refer to FIG. 1 , FIG. 2 and FIG. 3 , the present application provides a backlight module 100 . The backlight module 100 includes an optical film 10 and a backlight source 20 . The optical film 10 is provided with a fingerprint signal conducting portion 11 , and the backlight 20 is fixed on the edge of the optical film 10 . The backlight source 20 is provided with a visible light lamp 21 and a fingerprint detection signal source 22 . The light of the visible light lamp 21 is incident from the edge of the optical film material 10 and exits from one side of the optical film material 10 . The fingerprint detection signal emitted by the fingerprint detection signal source 22 is incident from the edge of the optical film 10 , and is emitted from the visible light lamp 21 from the optical film 10 through the fingerprint signal transmission part 11 . It can be understood that the backlight module 100 can be applied to electronic devices, and the electronic devices can be mobile phones, notebook computers, tablet computers, smart watches and other devices.

The backlight source 20 is provided with a fingerprint detection signal source 22, the backlight source 20 is fixed on the edge of the optical film 10, and the optical film 10 is provided with a fingerprint signal transmission part 11, so that the fingerprint detection signal source 22 After the fingerprint detection signal is incident on the optical film material 10, the visible light lamp 21 is emitted from the optical film material 10 on one side to realize fingerprint detection. The fingerprint detection signal source 22 is integrated in the backlight module 100. , effectively reducing the overall volume of the backlight module 100 .

It can be understood that the backlight module 100 is often used in the display screen of electronic equipment, and the main function of the backlight module 100 is to emit white backlight light, so as to use the white backlight light to assist the display module of the display screen to display images. In the conventional technology, the fingerprint detection signal source 22 is disposed on the back of the backlight module 100 , and the back structure of the backlight module 100 needs to be improved so that the detection signal of the fingerprint detection signal source 22 can pass through the back of the backlight module 100 structure. However, after the back structure of the backlight module 100 is improved to transmit the detection signal, the performance of the backlight module 100 itself to emit backlight will be reduced, and the service life of the backlight module 100 will be reduced. For example, the back protection structure of the backlight module 100 needs to be perforated, and the fingerprint detection signal is transmitted through the perforation. However, the perforation will cause the backlight module 100 to be easily exposed to uneven heat and humidity in a high temperature and high humidity environment, which will lead to the occurrence of optical films. folds. Disposing the fingerprint detection signal source 22 on the back of the backlight module 100 also makes the fingerprint detection signal source 22 stack with the backlight module 100 to increase the overall thickness. In the conventional technology, the fingerprint detection signal source 22 is also disposed on one side of the backlight module 100, and emits the fingerprint detection signal in a direction inclined toward the backlight module 100, so as to realize the fingerprint identification function. However, the fingerprint detection signal is disposed on one side of the backlight module 100 , so that the fingerprint detection signal source 22 and the backlight module 100 take up more space as a whole, resulting in poor space utilization.

In the embodiment of the present application, the fingerprint detection signal source 22 is arranged in the backlight source 20 of the backlight module 100, and there is no need to improve the back structure of the backlight module 100, which can effectively ensure the outgoing backlight performance of the backlight module 100. In addition, the backlight module 100 can effectively emit fingerprint identification signals. Under the condition that the volume of the original backlight source 20 is kept unchanged, the fingerprint detection signal source 22 does not need to be stacked with the backlight module 100 , and the overall thickness is reduced compared with the prior art, and it can be avoided to install in an area outside the backlight module 100 . The fingerprint detection signal source 22 prevents the fingerprint detection signal source 22 from occupying too much space.

In one embodiment, the optical film 10 is provided with a light guide plate 12 , and the fingerprint signal conducting portion 11 is provided on the light guide plate 12 . The light guide plate 12 has a front surface 121 and a back surface 122 opposite to the front surface 121 , and a side surface 123 connected between the front surface 121 and the back surface 122 . The fingerprint signal conducting portion 11 is disposed between the front surface 121 and the back surface 122 . The light guide plate 12 has two relatively short sides 124 and two relatively long sides 125 . The two short sides 124 are connected between the two long sides 125 . The light guide plate 12 is further provided with a light conducting portion 13 integrally provided with the fingerprint signal conducting portion 11 . The function of the fingerprint signal conducting part 11 is to change the conducting direction of the fingerprint detecting signal sent by the fingerprint detecting signal source 22 so as to transmit the fingerprint detecting signal to a preset area. When the backlight module 100 is applied to an electronic device, a fingerprint recognition area is formed in an area of the electronic device that is opposite to the preset area, thereby realizing fingerprint recognition. The light guide plate 12 forms a detection signal outgoing area 126 in the area of the front surface 121 opposite to the fingerprint signal conducting portion 11 . The fingerprint signal conducting part 11 can also transmit the light of the visible light lamp 21 . The light transmittance of the fingerprint signal transmission part 11 to the visible light lamp 21 is the same as the light transmittance of the light transmission part 13 to the visible light lamp 21 , that is to say, the front surface 121 and the fingerprint The area opposite to the signal conducting portion 11 can also emit the light of the visible light lamp 21 , so as to meet the requirement that the front surface 121 of the light guide plate 12 emits white backlight light as a whole. The light emitted by the visible light lamp 21 is visible light. Optionally, the light emitted by the visible light lamp 21 is white backlight light. Of course, the light emitted by the visible light lamp 21 may also be yellow backlight light, or visible light similar to white light.

The function of the light conducting part 13 is to conduct visible light and also conduct the fingerprint detection signal to the fingerprint signal conducting part 11 . Since the front surface 121 of the light guide plate 12 is flat, the light from the visible light lamp 21 is totally reflected in the light guide portion 13 and the fingerprint signal guide portion 11 after entering the light guide plate 12 . Since the back surface 122 of the light guide plate 12 is provided with small uneven spots, the light of the visible light lamp 21 reflected to the back surface 122 does not meet the requirement of total reflection, but exits toward the front surface 121 and finally exits from the front surface 121 . In order to achieve the light requirement of the backlight module 100 to emit the visible light lamp 21 .

The backlight source 20 is fixed on the edge of the light guide plate 12 . There is a certain distance between the detection signal emitting area 126 and the edge of the light guide plate 12 , so as to facilitate the user's finger to perform fingerprint identification at the edge away from the backlight module 100 . The size of the detection signal emitting area 126 is determined by the size of the fingerprint detection signal source 22 and the size of the fingerprint signal conducting portion 11 . The size of the detection signal exit region 126 is proportional to the size of the fingerprint detection signal source 22 and the size of the fingerprint signal conducting portion 11 .

Optionally, the backlight source 20 is fixed to the long side 125 of the light guide plate 12 and extends in a direction parallel to the long side 125 . The backlight source 20 covers the long side 125 of the backlight source 20 , so that the light of the visible light lamp 21 of the backlight source 20 is incident into the light guide plate 12 from the long side 125 , and is emitted from the light guide plate 12 . The entire front 121 of the exit.

Optionally, the backlight source 20 is fixed to the short side 124 of the light guide plate 12 and extends in a direction parallel to the short side 124 . The backlight source 20 covers the short side 124 of the backlight source 20 , so that the light of the visible light lamp 21 of the backlight source 20 is incident into the light guide plate 12 from the short side 124 , and is emitted from the light guide plate 12 . The entire front 121 of the exit.

Optionally, the backlight source 20 can fix the optical film material 10 to face the edge of the front face 121 , the visible light lamp 21 of the backlight source 20 is incident on the front face 121 , and the fingerprint detection signal source is 22 The fingerprint detection signal is incident on the front surface 121 .

Optionally, the backlight source 20 can be fixed on the side surface 123 , the visible light lamp 21 of the backlight source 20 emits light from the side surface 123 , and the fingerprint detection signal source 22 emits a fingerprint detection signal toward the side surface 123 . .

Optionally, the backlight source 20 can be fixed on the optical film 10 directly opposite the edge of the back side 122 , the visible light lamp 21 of the backlight source 20 is incident from the back side 122 , and the detection signal source is The fingerprint detection signal is incident toward the edge of the back surface 122 .

In this embodiment, the fingerprint signal conducting part 11 is provided with an inclined surface 111, the backlight 20 is fixed on the side surface 123 of the light guide plate 12, and the fingerprint detection signal sent by the fingerprint detection signal source 22 is sent from the The side surface 123 of the light guide plate 12 is incident on the inclined surface 111 and then reflected to the side of the light guide plate 12 where the light of the visible light lamp 21 is emitted. The fingerprint detection signal source 22 is an infrared light source. The fingerprint detection signal sent by the fingerprint detection signal source 22 is infrared light. The fingerprint detection signal from the fingerprint detection signal source 22 is transmitted to the inclined surface 111 in a direction parallel to the back surface 122 , and is reflected at the inclined surface 111 , and then reflected to the detection signal exit area of the front surface 121 . 126. The inclined surface 111 is the interface between the fingerprint signal conducting portion 11 and the light conducting portion 13 . The transmittance of the fingerprint signal conducting portion 11 to visible light is greater than the transmittance of the infrared light, and the reflectivity of the fingerprint signal conducting portion 11 to infrared light is greater than that of visible light. The fingerprint signal conducting part 11 allows the light of the visible light lamp 21 to pass through and conduct in the form of total reflection in the light guide plate 12 . The light of the visible light lamp 21 can be conducted from the back surface 122 to the detection signal exit area 126 of the front surface 121 through the fingerprint signal conducting portion 11 , so that the detection signal exit area 126 can still emit the light of the visible light lamp 21 normally.

It can be understood that the fingerprint detection signal sent by the fingerprint detection signal source 22 may also be an ultrasonic signal, an electromagnetic signal, or a temperature signal.

Optionally, the fingerprint signal conducting portion 11 is in a sheet shape, and the side of the fingerprint signal conducting portion 11 away from the inclined surface 111 is parallel to the inclined surface 111 . The inclined surface 111 connects the front surface 121 and the back surface 122 . Of course, in other embodiments, there may also be a distance between the inclined surface 111 and the front surface 121 or/and the back surface 122 , that is, the fingerprint signal conducting portion 11 and the front surface 121 or/and the back surface 122 There is a gap.

Optionally, the fingerprint signal conducting portion 11 is in the shape of a prism. A surface of the fingerprint signal conducting portion 11 away from the inclined surface 111 is substantially perpendicular to the front surface 121 .

Further, the backlight source 20 is further provided with a fingerprint signal sensor 23, and the fingerprint signal sensor 23 is used to receive a fingerprint identification signal. It is obtained after the light emitted from the visible light lamp 21 from the light guide plate 12 is incident on one side, and is transmitted to the edge of the light guide plate 12 through the fingerprint signal conducting portion 11 .

In this embodiment, the fingerprint signal sensor 23 is disposed on the side of the fingerprint detection signal source 22 . The fingerprint signal sensor 23 is adjacent to the fingerprint detection signal source 22 , so as to facilitate receiving the fingerprint identification signal from the fingerprint signal sensor 23 .

It can be understood that, when the user's finger is located above the backlight module 100 and receives the fingerprint detection signal from the detection signal exit area 126, the fingerprint detection signal is reflected by the fingerprint of the user's finger to form a fingerprint identification signal, The fingerprint identification signal is then incident on the light guide plate 12 from the detection signal emitting area 126, and is transmitted to the inclined surface 111. The side surface 123 of the backlight source 20 is finally emitted from the side surface 123 to the fingerprint signal sensor 23 .

In the conventional technology, the fingerprint signal sensor 23 is disposed on one side of the backlight module 100, and receives the fingerprint identification signal in a direction inclined relative to the backlight module 100, so as to realize the fingerprint identification function. However, the fingerprint signal sensor 23 is disposed on one side of the backlight module 100 , so that the fingerprint signal sensor 23 and the backlight module 100 take up a lot of space as a whole, resulting in poor space utilization. In the conventional technology, the fingerprint signal sensor 23 is disposed on the back 122 of the backlight module 100 , and it is necessary to improve the back structure of the backlight module 100 so that the fingerprint sensor 23 can be obtained through the back structure of the backlight module 100 Fingerprint identification signal. However, after the back structure of the backlight module 100 is improved to be able to pass through fingerprint identification signals, the backlight module 100 itself will reduce the output backlight performance, and the service life of the backlight module 100 will be reduced. For example, the back protection structure of the backlight module 100 needs to be perforated, and the fingerprint identification signal can be transmitted through the perforation. However, the perforation will cause the backlight module 100 to be easily exposed to uneven heat and humidity in a high temperature and high humidity environment, which will lead to the occurrence of optical film. folds. In turn, it will interfere with the transmission direction of the optical path and the recognition accuracy received. Disposing the fingerprint sensor 23 on the back of the backlight module 100 also makes the fingerprint sensor 23 stack with the backlight module 100 to increase the overall thickness.

In the embodiment of the present application, the fingerprint signal sensor 23 is arranged in the backlight source 20 of the backlight module 100, and there is no need to improve the back structure of the backlight module 100, which can effectively ensure the outgoing backlight performance of the backlight module 100. In addition, the backlight module 100 can effectively emit fingerprint identification signals. Under the condition that the volume of the original backlight source 20 is kept unchanged, the fingerprint sensor 23 does not need to be stacked with the backlight module 100 , the overall thickness is reduced compared to the prior art, and it can be avoided to install in the area outside the backlight module 100 The fingerprint signal sensor 23 prevents the fingerprint signal sensor 23 from occupying too much space.

Specifically, the backlight source 20 is provided with a plurality of the visible light lamps 21 , and the plurality of the visible light lamps 21 are arranged along the length direction of the edge of the light guide plate 12 , and the fingerprint detection signal source 22 is arranged in the opposite direction. between two adjacent visible light lamps 21 . The fingerprint detection signal source 22 is provided with two signal emission sources 221 . The two signal emission sources 221 are disposed between two adjacent visible light lamps 21 . The fingerprint signal sensor 23 is disposed between the two signal emission sources 221 . The backlight source 20 further includes a circuit board 24 . A plurality of the visible light lamps 21 , the two signal emission sources 221 and the fingerprint signal sensor 23 are disposed on the side of the circuit board 24 facing the light guide plate 12 . The visible light lamp 21 , the signal emission source 221 and the fingerprint signal sensor 23 all transmit electrical signals to the main board of the electronic device through the circuit board 24 . The circuit board 24 also supports the visible light lamp 21 , the signal emitting source 221 and the fingerprint signal sensor 23 stably, so that the structure of the backlight source 20 is stable. Of course, in other embodiments, the backlight source 20 may also be provided with one signal emission source 221, or more than two signal emission sources 221 may be provided, and the backlight source 20 may also be provided with two or two The fingerprint signal sensor 23 described above.

More specifically, the backlight module 100 further includes a diffusion sheet 30 and a light enhancement sheet 40 that are sequentially stacked on the light guide plate 12 to emit light from the visible light lamp 21 , and a diffuser sheet 30 and a light enhancement sheet 40 that are sequentially stacked on the light guide plate 12 to emit the light from the light guide plate 12 . The reflective sheet 50 and the protective layer 60 on the opposite side of the visible light lamp 21. That is, the diffusion sheet 30 and the light enhancement sheet 40 are attached to the front surface 121 in sequence, and the reflection sheet 50 and the protective layer 60 are attached to the back surface 122 in sequence. The intensifier sheet 40 is used to increase the transmittance of the light emitted by the visible light lamp 21 , and the diffuser sheet 30 is used to diffuse the light of the visible light lamp 21 , so that the light of the visible light lamp 21 is formed from a point light source to a surface light source. The reflection sheet 50 increases the light reflectivity of the visible light lamp 21 and increases the light output rate of the visible light lamp 21 from the front surface 121 . The protective layer 60 covers the backlight source 20 , and the protective layer 60 also covers the edge of the light guide plate 12 to prevent the light of the backlight source 20 from leaking from the edge of the light guide plate 12 . Optionally, the protective layer 60 is a metal sheet, and the protective layer 60 has rigid protective performance, so as to increase the structural stability of the backlight module 100 .

It can be understood that the fingerprint detection signal emitted by the light guide plate 12 from the detection signal emitting area 126 is transmitted to the user's fingerprint after passing through the light-enhancing sheet 40 and the diffusing sheet 30, and is reflected by the user's fingerprint to form a fingerprint. The identification signal is transmitted through the light-enhancing sheet 40 and the diffusing sheet 30

In another embodiment, please refer to FIG. 4 , which is substantially the same as the embodiment shown in FIG. 1 , except that the backlight source 20 is fixed at the edge of the back surface 122 of the light guide plate 12 . The visible light lamp 21 is incident into the light guide plate 12 from the edge of the back surface 122 . The fingerprint signal conducting portion 11 is provided with a first conducting portion 112 and a second conducting portion 113 opposite to the first conducting portion 112 . The first conducting portion 112 is adjacent to the edge of the light guide plate 12 and is directly opposite to the fingerprint signal source. The second conducting portion 113 is directly opposite to the detection signal exit region 126 . The first conductive portion 112 is provided with a first inclined surface 114 , and the second conductive portion 113 is provided with a second inclined surface 115 . The first inclined surface 114 is parallel to the second inclined surface 115 . The fingerprint detection signal emitted by the fingerprint detection signal source 22 is incident from the edge of the back surface 122 into the light guide plate 12 and conducted to the first inclined surface 114 , and then transmitted to the first inclined surface 114 after being reflected by the first inclined surface 114 . The second inclined surface 115 is reflected by the second inclined surface 115 and then transmitted to the detection signal exit area 126 of the front surface 121 , and then exits from the detection signal exit area 126 . The path through which the fingerprint signal sensor 23 receives the fingerprint identification signal is substantially opposite to the path through which the fingerprint detection signal source 22 transmits the fingerprint detection signal. The light transmittance of the first conducting portion 112 and the second conducting portion 113 to the visible light lamp 21 is greater than the transmittance of the infrared light, and the first conducting portion 112 and the second conducting portion 113 are sensitive to infrared light. The light reflectivity is greater than the light reflectivity of the visible light lamp 21 .

Optionally, the first conducting portion 112 or/and the second conducting portion 113 may be in a sheet shape, and the first conducting portion 112 is away from the first inclined surface 114 and the first inclined surface 114 parallel, or/and the side of the second conductive portion 113 away from the second inclined surface 115 is parallel to the second inclined surface 115 .

Optionally, the first conducting portion 112 or/and the second conducting portion 113 are prisms.

In another embodiment, please refer to FIG. 5 , which is substantially the same as the embodiment shown in FIG. 4 , except that the backlight source 20 is fixed at the edge of the front surface 121 of the light guide plate 12 . The visible light lamp 21 is incident into the light guide plate 12 from the edge of the front surface 121 . The fingerprint signal conducting portion 11 is provided with a first conducting portion 112 and a second conducting portion 113 opposite to the first conducting portion 112 . The first conducting portion 112 is adjacent to the edge of the fingerprint signal conducting portion 11 and is directly opposite to the fingerprint detection signal source 22 . The second conducting portion 113 is directly opposite to the detection signal exit region 126 . The first conductive portion 112 is provided with a first inclined surface 114 , and the second conductive portion 113 is provided with a second inclined surface 115 . The first inclined surface 114 and the second inclined surface 115 form an included angle. The fingerprint detection signal emitted by the fingerprint detection signal source 22 is incident from the edge of the front surface 121 into the light guide plate 12 and conducted to the first inclined surface 114 , and then transmitted to the first inclined surface 114 after being reflected by the first inclined surface 114 . The second inclined surface 115 is reflected by the second inclined surface 115 and then transmitted to the detection signal exit area 126 of the front surface 121 , and then exits from the detection signal exit area 126 . The path through which the fingerprint signal sensor 23 receives the fingerprint identification signal is substantially opposite to the path through which the fingerprint detection signal source 22 transmits the fingerprint detection signal. The light transmittance of the first conducting portion 112 and the second conducting portion 113 to the visible light lamp 21 is greater than the transmittance of the infrared light, and the first conducting portion 112 and the second conducting portion 113 are sensitive to infrared light. The light reflectivity is greater than the light reflectivity of the visible light lamp 21 .

In another embodiment, please refer to FIG. 6 , which is substantially the same as the embodiment shown in FIG. 1 , except that the backlight source 20 is a plate-shaped light source. The plurality of visible light lamps 21 of the backlight source 20 are arranged in an array on the back surface 122 of the light guide plate 12 . The signal emission source 221 of the fingerprint detection signal source 22 is disposed between two adjacent visible light lamps 21 . The fingerprint signal sensor 23 is disposed between two adjacent visible light lamps 21 . The fingerprint signal conducting part 11 is opposite to the fingerprint detection signal source 22 . The fingerprint detection signal emitted by the fingerprint detection signal source 22 can be transmitted from the back surface 122 to the detection signal exit area 126 of the front surface 121 through the fingerprint signal transmission part 11 . The transmittance of the fingerprint signal conducting part 11 to the fingerprint detection signal is the same as the transmittance of the visible light lamp 21 .

In another embodiment, please refer to FIG. 7 , which is substantially the same as the embodiment shown in FIG. 3 , the difference is that the fingerprint signal conducting part 11 is also disposed on the diffusion sheet 30 , and the fingerprint signal conducting part 11 is The inclined surface 111 is disposed in the light guide plate 12 and the diffusion sheet 30 , so that the area of the inclined surface 111 is increased. The fingerprint detection signal emitted by the fingerprint detection signal source 22 is incident into the light guide plate 12 and the diffuser 30 from the side surface 123 of the light guide plate 12 and the side surface 123 of the diffusion sheet 30, so that the fingerprint detection is performed. The projection range of the signal is increased, so that the area of the detection signal exit region 126 can be increased.

In another embodiment, please refer to FIG. 8 , which is substantially the same as the embodiment shown in FIG. 7 . The inclined surface 111 of the signal conducting portion is disposed in the light guide plate 12 , the diffusion sheet 30 and the light enhancement sheet 40 , so that the area of the inclined surface 111 is further increased. The fingerprint detection signal emitted by the fingerprint detection signal source 22 is incident on the light guide plate 12 and the diffuser 30 from the side surface 123 of the light guide plate 12 , the side surface 123 of the diffusion sheet 30 and the side surface 123 of the light enhancement sheet 40 . The projection range of the fingerprint detection signal is increased, and the area of the detection signal exit region 126 can be increased.

In another embodiment, please refer to FIG. 9 , which is substantially the same as the implementation shown in FIG. 3 , except that the signal conducting portion is disposed on the diffusion sheet 30 or/and the brightness enhancement sheet 40 . The fingerprint detection signal of the fingerprint detection signal source 22 is incident on the inclined surface 111 from the side surface 123 of the diffusion sheet 30 or/and the side surface 123 of the light enhancement sheet 40, and after being reflected by the inclined surface 111, it is emitted from the inclined surface 111. The light enhancement sheet 40 exits from the side away from the light guide plate 12 .

In another embodiment, please refer to FIG. 10 , which is substantially the same as the embodiment shown in FIG. 3 , except that the backlight source 20 is provided with a visible light lamp 21 and the fingerprint signal sensor 23 , and the backlight module 100 further includes a fingerprint detection signal source 22, the fingerprint detection signal source 22 is fixed on the light guide plate 12 on the opposite side of the light guide plate 12 to emit light from the visible light lamp 21, and the fingerprint detection signal emitted by the fingerprint detection signal source 22 passes through the guide plate. The light plate 12 exits. The fingerprint detection signal source 22 is disposed on the side of the protective layer 60 facing away from the light guide plate 12 . The protective layer 60 of the backlight module 100 and the reflection sheet 50 are provided with a hollow area 61 facing the fingerprint detection signal source 22 , and the fingerprint detection signal sent by the fingerprint detection signal source 22 is transmitted through the hollow area 61 . After passing through the light guide plate 12 , the diffusing sheet 30 and the light enhancement sheet 40 , it is transmitted to the user's fingerprint, and after being reflected by the user's fingerprint, it is transmitted to the fingerprint signal sensor 23 in an oblique direction relative to the light guide plate 12 .

In another embodiment, please refer to FIG. 11 , which is substantially the same as the embodiment shown in FIG. 10 , the difference is that the fingerprint detection signal source 22 is disposed in the backlight source 20 , and the fingerprint signal sensor 23 is disposed in the The protective layer 60 faces away from the light guide plate 12 .

Referring to FIG. 12 , the present application further provides a display screen 200 , the display screen 200 includes a display module 210 and the backlight module 100 , and the display module 210 includes a display module 210 stacked on the backlight module 100 in sequence. The lower polarizer 211 , the thin film transistor layer 212 , the liquid crystal layer 213 , the pixel layer 214 and the upper polarizer 215 . The optical film material 10 of the backlight module 100 emits light from the visible light lamp 21 and passes through the lower polarizer 211 , the thin film transistor layer 212 , the liquid crystal layer 213 , the pixel layer 214 and the upper polarizer 215 in sequence, so as to realize the display screen. 200 for image display. After the fingerprint detection signal emitted by the fingerprint detection signal source 22 is emitted from the detection signal exit area 126 , it is transmitted through the lower polarizer 211 , the thin film transistor layer 212 , the liquid crystal layer 213 , the pixel layer 214 and the upper polarizer 215 . to the user's fingerprint, and the fingerprint identification signal is formed after being reflected by the user's fingerprint. The detection signal is incident on the outgoing area 126 and is finally reflected to the fingerprint signal sensor 23 through the inclined surface 111 .

The display screen 200 further includes a transparent cover plate 220 , and the transparent cover plate 220 is attached to the side of the upper polarizer 215 away from the pixel layer 214 . The fingerprint detection signal emitted from the detection signal emission area 126 is emitted to the user's fingerprint through the transparent cover plate 220 .

In another embodiment, please refer to FIG. 13 , which is substantially the same as the embodiment shown in FIG. 12 , the difference is that the fingerprint sensor 23 is fixed on the transparent cover plate 220 and attached to the display module 210 side. The fingerprint signal sensor 23 is located in the non-display area of the display screen 200 . The fingerprint detection signal emitted by the fingerprint detection signal source 22 from the side of the optical film 10 is transmitted to the detection signal output area 126 through the fingerprint signal transmission part 11 and emitted through the display module 210 After reaching the transparent cover plate 220 , a fingerprint identification signal is formed after the user's fingerprint is reflected, and the fingerprint identification signal is transmitted to the fingerprint sensor in an oblique direction relative to the transparent cover plate 220 .

Please refer to FIG. 2 , FIG. 12 and FIG. 14 , the present application further provides an electronic device 300 , the electronic device 300 includes the display screen 200 , and the electronic device further includes a middle frame covered with the display screen 200 , a back cover and a mainboard fixed between the display screen 200 and the middle frame. The back cover is fixed on the side of the middle frame facing away from the display screen 200 . The main board is electrically connected to the display screen 200 . It can be understood that the electronic device may be a mobile phone, a notebook computer, a tablet computer, a smart watch, or other devices.

The backlight source 20 is provided with a fingerprint detection signal source 22, the backlight source 20 is fixed on the edge of the optical film 10, and the optical film 10 is provided with a fingerprint signal transmission part 11, so that the fingerprint detection signal source 22 After the fingerprint detection signal is incident on the optical film material 10, the light from the visible light lamp 21 is emitted from the optical film material 10, so as to realize fingerprint detection, and the fingerprint detection signal source 22 is integrated in the backlight module 100. Inside, the overall volume of the backlight module 100 is effectively reduced.

It can be understood that, in the electronic device of the present application, the fingerprint detection signal source 22 or/and the fingerprint signal sensor 23 are arranged on the backlight source 20, so as to avoid increasing the arrangement space outside the backlight module, and can The frame width of the original display screen 200 is reduced or maintained, and the screen ratio of the display area of the display screen 200 is increased. The fingerprint detection signal source 22 or/and the fingerprint signal sensor 23 are not stacked with the backlight module, and the original thickness design of the display screen 200 can be reduced or maintained, making the electronic device thinner and lighter. The back structure of the backlight module 100 does not need to be improved, which ensures the air tightness of the backlight module, which is beneficial to the stable performance of the backlight module in a high temperature and high humidity environment, and prolongs the service life of the electronic equipment.

The above is the implementation of the embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of the embodiments of the present application, several improvements and modifications can also be made. These improvements and modifications are also It is regarded as the protection scope of this application.

Claims (17)

1. A backlight module, characterized in that, the backlight module comprises an optical film material and a backlight source, the optical film material is provided with a fingerprint signal conduction portion, and the backlight source is fixed on the edge of the optical film material , the backlight is provided with a visible light lamp and a fingerprint detection signal source, the light of the visible light lamp is incident from the edge of the optical film material and exits from one side of the optical film material, the fingerprint detection signal source issued by the fingerprint detection signal source The detection signal is incident from the edge of the optical film material, and is transmitted through the fingerprint signal conducting part and then exits the visible light beam from the optical film material. 2 . The backlight module of claim 1 , wherein the optical film material is provided with a light guide plate, and the fingerprint signal conducting portion is disposed on the light guide plate. 3 . 3 . The backlight module according to claim 2 , wherein the fingerprint signal conducting portion is provided with an inclined surface, the backlight source is fixed on the side surface of the light guide plate, and the fingerprint detection signal source emits fingerprints. 4 . The detection signal is incident on the inclined surface from the side of the light guide plate and then reflected to the side of the light guide plate where the visible light is emitted. 4 . The backlight module according to claim 2 , wherein the fingerprint signal conducting portion is provided with a first inclined surface and a second inclined surface opposite to the first inclined surface, and the backlight source is fixed on 4 . The light guide plate emits the visible light rays, or is fixed on the opposite side of the light guide plate that emits the visible light rays, the fingerprint detection signal source is opposite to the first inclined surface, and the fingerprint detection signal source The emitted fingerprint detection signal is incident on the first inclined surface from one side of the light guide plate and then reflected to the second inclined surface, and is reflected from the second inclined surface and then exits through the side that emits the visible light. 5 . The backlight module according to claim 2 , wherein the backlight source is fixed on the opposite side of the light guide plate that emits the visible light, and the fingerprint detection signal sent by the fingerprint detection signal source is transmitted through the light guide plate. 6 . The light guide plate exits. 6 . The backlight module according to claim 1 , wherein the backlight source is provided with a plurality of the visible light lamps, and the plurality of the visible light lamps are along the length of the edge of the light guide plate. 7 . The fingerprint detection signal source is arranged between two adjacent visible light lamps. 7 . The backlight module according to claim 1 , wherein the backlight source is further provided with a fingerprint signal sensor, and the fingerprint signal sensor is used to receive a fingerprint identification signal, wherein the The fingerprint identification signal is obtained after the fingerprint detection signal is reflected by the user's fingerprint, the visible light is incident from the optical film material, and is transmitted to the edge of the optical film material through the fingerprint signal transmission part. . 8 . The backlight module according to claim 2 , wherein the backlight module further comprises a diffuser sheet and a light-enhancing sheet that are sequentially stacked on one side of the light guide plate that emits the visible light rays, and are sequentially stacked on the light guide plate. 9 . The light guide plate emits the reflective sheet and the protective layer on the opposite side of the visible light. 9 . The backlight module of claim 8 , wherein the fingerprint signal conducting portion is further disposed on the diffusion sheet, or disposed on the diffusion sheet and the brightness enhancement sheet. 10 . 10 . The backlight module according to claim 1 , wherein the optical film material comprises a light guide plate, a diffusion sheet and a light enhancement sheet which are stacked in sequence, and the signal conducting portion is disposed on the diffusion sheet or/and the light enhancement sheet. 11 . 11. A backlight module, characterized in that the backlight module comprises a light guide plate and a backlight source, the backlight source is fixed on the edge of the light guide plate, and the backlight source is provided with a visible light lamp and a fingerprint signal sensor , the light of the visible light lamp is incident from the edge of the light guide plate and exits from one side of the light guide plate, and the fingerprint signal sensor receives the fingerprint identification signal from the edge of the light guide plate. 12 . The backlight module according to claim 11 , wherein the backlight module further comprises a fingerprint detection signal source, and the fingerprint detection signal source is fixed on the opposite side of the light guide plate that emits the visible light rays, 12 . The fingerprint detection signal sent by the fingerprint detection signal source is emitted through the light guide plate. 13. A display screen, characterized in that the display screen comprises the backlight module according to any one of claims 1 to 12, and the display screen further comprises a lower polarizer and a film sequentially stacked on the backlight module Transistor layer, liquid crystal layer, pixel layer and upper polarizer. 14 . The display screen according to claim 13 , wherein the display screen further comprises a light-transmitting cover plate laminated on the upper polarizer. 15 . 15. A display screen, characterized in that the display screen includes a display module and a backlight module, the backlight module includes a light guide plate and a backlight source, the light guide plate is provided with a fingerprint signal conduction part, and the backlight The source is fixed on the edge of the light guide plate, the backlight source is provided with a visible light lamp and a fingerprint detection signal source, the light of the visible light lamp is incident from the edge of the light guide plate and exits from one side of the light guide plate to the display module, the fingerprint detection signal emitted by the fingerprint detection signal source is incident from the edge of the light guide plate, and is transmitted from the light guide plate to the display module after being conducted by the fingerprint signal conduction part, and finally from the light guide plate. The display module is ejected. 16 . The display screen according to claim 15 , wherein the display screen further comprises a light-transmitting cover plate attached to the display module, and a transparent cover plate fixed on the transparent cover plate and attached to the display module. 17 . A fingerprint signal sensor on one side of the set, the fingerprint signal sensor receives a fingerprint identification signal from the light-transmitting cover, wherein the fingerprint identification signal is emitted from the light-transmitting cover to the user's fingerprint by the fingerprint detection signal. The back-reflected light-transmitting cover plate is formed by emitting from the light-transmitting cover plate. 17 . An electronic device, characterized in that, the electronic device further comprises the display screen according to any one of claims 13 to 16 .

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