CN112364811A

CN112364811A - Display device

Info

Publication number: CN112364811A
Application number: CN202011342729.9A
Authority: CN
Inventors: 景武; 刘博智
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2021-02-12
Anticipated expiration: 2040-11-25
Also published as: CN112364811B

Abstract

The invention discloses a display device, which comprises a display panel and a backlight module which are oppositely arranged, wherein the display panel comprises a first substrate and a second substrate which are oppositely arranged, and further comprises an alignment hole unit, the alignment hole unit penetrates through partial film layers of the first substrate and the second substrate in a first direction, the alignment hole unit comprises a hollow part and a shading part, the first substrate comprises a plurality of light sensing elements for receiving light rays for identification, and the orthographic projection of the light sensing elements on the first substrate is at least partially overlapped with the orthographic projection of the hollow part on the first substrate; the display device further comprises a conversion layer, the conversion layer is used for converting light rays pointing to the direction of the backlight module from the light-emitting surface of the display device into second wavelengths from first wavelengths, orthographic projections of the conversion layer on the first substrate are at least partially overlapped with orthographic projections of the hollow parts on the first substrate, and the second wavelengths are larger than the first wavelengths. The invention reduces the long-wave-band stray light inside the display device by using the conversion layer and reduces the influence of the long-wave-band stray light on the light sensing element.

Description

Display device

Technical Field

The invention relates to the technical field of display, in particular to a display device.

Background

In recent years, with the spread of mobile display products, information security is receiving attention from consumers. Fingerprint identification has uniqueness and is difficult to copy, and the fingerprint identification is widely applied to unlocking and payment confirmation of mobile display products, and the information security is concerned by people along with the popularization of the mobile display products.

When the display panel carries out fingerprint identification, light rays emitted by the light source are reflected by a finger and enter the fingerprint identification unit, and the fingerprint identification unit further identifies the ridges of the fingerprint corresponding to the area according to the received reflected light rays. However, the fingerprint identification unit has good sensitivity for identifying long wave bands in fingerprint signal light, the efficiency for identifying blue light of short wave bands in the signal is very low, and the existing backlight is a red-green light source, so that the interference of stray light of long wave bands on the fingerprint identification unit is large, and the sensitivity and the accuracy of the fingerprint identification unit can be influenced.

Disclosure of Invention

In view of this, the present invention provides a display device, which utilizes a conversion layer to reduce long-wavelength-band stray light inside the display device, and reduces the influence of the long-wavelength-band stray light on a light sensing element.

The invention provides a display device, which comprises a display panel and a backlight module which are oppositely arranged, wherein the display panel comprises a first substrate and a second substrate which are oppositely arranged, and the second substrate is positioned between the first substrate and the backlight module; the display panel further comprises a collimating hole unit, wherein the collimating hole unit penetrates through partial film layers of the first substrate and the second substrate in a first direction, and the first direction is a direction perpendicular to the display panel; the collimating hole unit comprises a hollow part and a light shielding part, and the orthographic projection of the light shielding part on the first substrate surrounds the orthographic projection of the hollow part on the first substrate; the first substrate comprises a plurality of light sensing elements, orthographic projections of the light sensing elements on the first substrate are at least partially overlapped with orthographic projections of the hollow parts on the first substrate, and the light sensing elements are used for receiving light rays for identification; the display device further comprises a conversion layer, the conversion layer is used for converting the light rays pointing to the direction of the backlight module from the light-emitting surface of the display device from a first wavelength to a second wavelength, and the orthographic projection of the conversion layer on the first substrate is at least partially overlapped with the orthographic projection of the hollow part on the first substrate; wherein the second wavelength is greater than the first wavelength.

Compared with the prior art, the display device provided by the invention is provided with the conversion layer, the orthographic projection of the conversion layer on the first substrate is at least partially overlapped with the orthographic projection of the hollow part on the first substrate, and then the light which is transmitted by the hollow part and points to the backlight module from the light-emitting surface of the display device is converted into the second wavelength by the conversion layer from the first wavelength, wherein the second wavelength is larger than the first wavelength. Because the light sensing element has good sensitivity for identifying the long wave band in the fingerprint signal light and has very low efficiency for identifying the blue light of the short wave band in the signal, namely, the light of the short wavelength which enters the light sensing element can be converted into the light of the long wavelength by arranging the conversion layer, thereby improving the sensitivity and the accuracy of the light sensing element.

Of course, it is not necessary for any product in which the present invention is practiced to specifically achieve all of the above technical effects simultaneously.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic diagram of a prior art display device;

FIG. 2 is a schematic structural diagram of a display device according to the present invention;

FIG. 3 is a schematic diagram illustrating the photosensitive characteristics of the photosensitive element of FIG. 2;

FIG. 4 is a schematic structural diagram of another display device according to the present invention;

FIG. 5 is a schematic structural diagram of another display device according to the present invention;

FIG. 6 is a schematic structural diagram of another display device according to the present invention;

FIG. 7 is a schematic structural diagram of another display device according to the present invention;

FIG. 8 is a schematic structural diagram of another display device according to the present invention;

FIG. 9 is a schematic structural diagram of another display device according to the present invention;

fig. 10 is a schematic structural diagram of another display device provided by the present invention.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a display device in the prior art. The display device 100 provided by the prior art includes a display panel 01 and a backlight module 02 which are oppositely arranged, wherein the display panel 01 includes a first substrate 011 and a second substrate 012 which are oppositely arranged, and further includes a liquid crystal 013 which is sandwiched between the first substrate 011 and the second substrate 012. The second substrate 012 is located between the first substrate 011 and the backlight module 02; the display panel further comprises a collimating hole unit 03, wherein the collimating hole unit 03 penetrates through partial film layers of the first substrate 011 and the second substrate 012 in a first direction X, and the first direction X is a direction perpendicular to the display panel 01; the collimating aperture unit 03 comprises a hollow portion 031 and a light shielding portion 032, wherein an orthographic projection of the light shielding portion 032 on the first substrate 011 surrounds an orthographic projection of the hollow portion 031 on the first substrate 011; the first substrate 011 comprises a plurality of light sensing elements O, wherein the orthographic projection of the light sensing elements O on the first substrate 011 is at least partially overlapped with the orthographic projection of the hollow-out portion 031 on the first substrate 011, and the light sensing elements O are used for receiving light rays for identification.

In fig. 1, only the collimating aperture unit 03 is illustrated as including three layers of hollow portions 031 and a light shielding portion 032 disposed opposite to the hollow portions 031.

It can be understood that: the fingerprint recognition principle in the display device 100 is that, when a finger touches the display screen, light is reflected when being irradiated to the valley line and the ridge line of the finger fingerprint, because the reflection angle of the valley line and the ridge line and the reflected illumination intensity are different, the light reflected by the finger penetrates through the hollow portion 031 and then is projected onto the light sensing element O, and the light sensing element O transmits the received sensing signal to the fingerprint recognition signal receiving unit (not shown in the figure) through the fingerprint signal line, so that the fingerprint recognition signal receiving unit recognizes the valley line and the ridge line of the fingerprint according to the received signal, and performs fingerprint recognition. However, the light sensing element O has different recognition capabilities for light rays with different wavelengths, so that the sensitivity for recognizing a long wavelength band in fingerprint signal light is good, the recognition efficiency for blue light in a short wavelength band in the signal is very low, that is, the recognition efficiency for the short wavelength band light reflected by a finger is very low, and meanwhile, the influence of stray light of other long wavelength bands can be also applied, so that the sensitivity and the accuracy of the light sensing element O can be reduced.

In order to solve the above technical problem, the present invention provides a display device. The following description will be made in detail with respect to embodiments of the display device provided by the present invention.

In this embodiment, please refer to fig. 2 and fig. 3, fig. 2 is a schematic structural diagram of a display device according to the present invention, and fig. 3 is a schematic diagram of a photosensitive characteristic of the photosensitive element in fig. 2. The display device 200 in the present embodiment includes: the display panel comprises a display panel 1 and a backlight module 2 which are oppositely arranged, wherein the display panel 1 comprises a first substrate 11 and a second substrate 12 which are oppositely arranged, and the display panel also comprises a liquid crystal 13 which is clamped between the first substrate 11 and the second substrate 12; the second substrate 12 is located between the first substrate 11 and the backlight module 2; the display panel further comprises a collimating hole unit 3, wherein the collimating hole unit 3 penetrates through partial film layers of the first substrate 11 and the second substrate 12 in a first direction X, and the first direction X is a direction perpendicular to the display panel 1; the collimating hole unit 3 comprises a hollow part 31 and a light shielding part 32, and the orthographic projection of the light shielding part 32 on the first substrate 11 surrounds the orthographic projection of the hollow part 31 on the first substrate 11; the first substrate 11 comprises a plurality of light sensing elements O, an orthographic projection of the light sensing elements O on the first substrate 11 is at least partially overlapped with an orthographic projection of the hollow part 31 on the first substrate 11, and the light sensing elements O are used for receiving light rays for identification; the display device 200 further includes a conversion layer 4, where the conversion layer 4 is configured to convert a light L pointing to the backlight module 2 from the light exit surface Q of the display device 200 from a first wavelength to a second wavelength, and an orthographic projection of the conversion layer 4 on the first substrate 11 at least partially overlaps an orthographic projection of the hollow portion 31 on the first substrate 22; wherein the second wavelength is greater than the first wavelength. The first wavelength and the second wavelength are not specifically required, and can be set according to actual conditions as long as the second wavelength is greater than the first wavelength, and details are not described below.

Fig. 2 only illustrates that the alignment hole unit 3 includes three layers of hollow portions 03 and a light shielding portion 32 disposed opposite to the hollow portion 31, and a specific structure of the alignment hole unit 3 is not limited, and may be set according to an actual situation, which is not described in detail below. Wherein, collimation hole unit 3 is used for choosing the light in the angle of settlement to with the angle suitable, arrange orderly light transmission to with collimation hole unit 3 one-to-one light sense component O, produce the fingerprint image that light sense component O detected with other disorderly light and disturb in order to reduce.

It can be understood that the light L reflected by the finger penetrates the hollow portion 31 and is incident on the light sensing element O for fingerprint identification. Since the orthographic projection of the conversion layer 4 on the first substrate 11 is at least partially overlapped with the orthographic projection of the hollow part 31 on the first substrate 22, the light passing through the hollow part 31 can pass through the conversion layer 4 at the same time, and further, since the conversion layer 4 is used for converting the light L directing from the light-emitting surface Q of the display device 200 to the backlight module 2 direction from the first wavelength to the second wavelength, wherein the second wavelength is larger than the first wavelength; that is, the light L reflected back by the finger is converted into the second wavelength from the first wavelength, the light L includes the first light L1 and the second light L2, the first light L1 is the light with the first wavelength, the second light L2 is the light with the second wavelength, the first light L1 and the second light L2 are two states of one light, the first light L1 is the state when the light L does not pass through the conversion layer 4, and the second light L2 is the state when the light L passes through the conversion layer 4. As shown in fig. 3, the light sensing element O has different recognition capabilities for light beams with different wavelengths, and has good recognition sensitivity for long wavelength bands in the fingerprint signal light, and has very low recognition efficiency for blue light of short wavelength bands in the signal, that is, the recognition efficiency for the short wavelength band light reflected back by the finger is very low, and meanwhile, the light sensing element O is also affected by stray light of other long wavelength bands, so that the sensitivity and accuracy of the light sensing element O can be reduced, and therefore, in this embodiment, the light beam L reflected back by the finger by the conversion layer 4 is converted from the first wavelength to the second wavelength, so that the second light beams L2 received by the light sensing element O are all long wavelength band light, and further, the sensitivity and accuracy of the light sensing element O can be improved.

Fig. 2 only shows that the orthographic projection of the conversion layer 4 on the first substrate 11 is completely overlapped with the orthographic projection of the hollow portion 31 on the first substrate 22, but the present invention is not limited thereto, and the present invention does not make any specific requirement on which film layer the conversion layer 4 is specifically located, so that the orthographic projection of the conversion layer 4 on the first substrate 11 is at least partially overlapped with the orthographic projection of the hollow portion 31 on the first substrate 22, and it is ensured that at least part of light can change the wavelength through the conversion layer 4, which will not be described in detail below.

In some alternative embodiments, referring to fig. 4, fig. 4 is a schematic structural diagram of another display device provided by the present invention. The backlight module 2 in the display device 200 provided by the present embodiment is a blue backlight module; the first substrate 11 is a color filter substrate, the color filter substrate 11 includes a color resistor 111, and an orthographic projection of the light shielding layer 32 on the plane of the second substrate 12 is arranged around an orthographic projection of the color resistor 111 on the plane of the second substrate 12; the color resistor 111 comprises a first color resistor 111a and a second color resistor 111b, wherein the first color resistor 111a is doped with first quantum dots, and the second color resistor 111b is doped with second quantum dots; the backlight light L0 emitted from the blue backlight module 2 is converted into a first color light La through the first color resistor 111a, and the backlight light L0 emitted from the blue backlight module 2 is converted into a second color light Lb through the second color resistor 111b, wherein the colors of the first color light La, the second color light Lb and the blue light are different.

Fig. 4 only illustrates that the conversion layer 4 and the color resistor 111 are two independent film layers, but the present invention does not make specific requirements on whether the conversion layer 4 and the color resistor 111 are disposed on the same layer, and may be disposed according to actual situations, which is not described in detail below.

It is understood that quantum dots (quantum dots) are semiconductor nanostructures that confine excitons in three spatial directions. Since quantum dots are nano-scale semiconductors, they emit light of a specific frequency by applying a certain electric field or light pressure to the nano-semiconductor material, and the frequency of the emitted light changes with the change of the size of the semiconductor, so that the color of the emitted light can be controlled by adjusting the size of the nano-semiconductor. Since the backlight module 2 provided in this embodiment is a blue backlight module, that is, a blue display light is provided for the display device 200, in order to enable the display device 200 to realize color display, a color resistor 111 is further disposed on any film layer of the hollow area 31, the color resistor 111 includes a first color resistor 111a and a second color resistor 111b, the first color resistor 111a is doped with the first quantum dots, and the second color resistor 111b is doped with the second quantum dots; the backlight light L0 emitted by the blue backlight module 2 is converted into a first color light La through the first color resistor 111a, the backlight light L0 emitted by the blue backlight module 2 is converted into a second color light Lb through the second color resistor 111b, and the colors of the first color light La, the second color light Lb and the blue light are different, so that the display device 200 can realize color display.

Optionally, referring to fig. 5, fig. 5 is a schematic structural diagram of another display device provided by the present invention, and fig. 5 only illustrates that the conversion layer 4 is multiplexed into the color resistor 111. Compared with the arrangement of the conversion layer 4 and the color resistor 111 in different layers, the present embodiment reuses the conversion layer 4 as the color resistor 111, and does not need a separate process to manufacture the conversion layer 4, thereby reducing the process and realizing the lightness and thinness of the display device 200.

In some alternative embodiments, as shown in fig. 4 and fig. 5, in the display device 200 in this embodiment, the first color light La is red light, the second color light Lb is green light, and the diameter of the first quantum dot is larger than that of the second quantum dot.

It can be understood that, according to the principle of the quantum dots, the larger the diameter of the quantum dots is, the larger the wavelength of the backlight light L0 emitted by the blue backlight module 2 after being converted by the film layer doped with the quantum dots is. Since the first color resistor 111a is doped with the first quantum dots and the second color resistor 111b is doped with the second quantum dots, the diameter of the first quantum dots is different from that of the second quantum dots in order to make the emitted light have different colors. Further, in order to realize the color display of the display device 200, blue light, red light and green light need to be emitted after passing through the color resistor 111, and further the first color light La needs to be red light, and the second color light Lb needs to be green light, so that the diameter of the first quantum dot needs to be larger than that of the second quantum dot, so that the display device 200 can realize the color display. Further, since part of the light emitted from the backlight module 2 is reflected by other films and directly enters the light sensing element O without entering a finger, the part of the light is stray light L ', which affects the fingerprint identification accuracy of the light sensing element O, however, since the backlight module 2 is a blue backlight module in this embodiment and the stray light L' is also blue stray light L ', since the light sensing element O has different identification capabilities for light with different wavelengths, the identification sensitivity for the long wavelength band in the fingerprint signal light is good, and the identification efficiency for the blue light with the short wavelength band in the signal is very low, the influence of the blue stray light L' emitted from the backlight module 2 with blue backlight on the light sensing element O is low, which is favorable for improving the sensitivity and accuracy of the light sensing element O.

As can be seen from the above, in the display device 200 provided in this embodiment, by providing the conversion layer 4 doped with quantum dots and the backlight module 2 in blue backlight, not only display can be achieved, but also the light reflected by the finger is converted from the first wavelength to the second wavelength with longer wavelength by the conversion layer 4, so that the second light received by the light sensing element O is the long-wavelength light, and thus the sensitivity and accuracy of the light sensing element O can be improved, and meanwhile, because the influence of the blue stray light emitted by the backlight module 2 in blue backlight on the light sensing element O is lower, the sensitivity and accuracy of the light sensing element O can be further improved.

In some alternative embodiments, referring to fig. 6, fig. 6 is a schematic structural diagram of another display device provided by the present invention. The backlight module 2 in the display device 200 provided by the present embodiment is a blue backlight module; the first substrate 11 is a color filter substrate, the color filter substrate 11 includes a color resistor 111, and an orthographic projection of the light shielding layer 32 on the plane of the second substrate 12 is arranged around an orthographic projection of the color resistor 111 on the plane of the second substrate 12; the color resistor 111 comprises a first color resistor 111a and a second color resistor 111b, wherein the first color resistor 111a is doped with first quantum dots, and the second color resistor 111b is doped with second quantum dots; the backlight light L0 emitted from the blue backlight module 2 is converted into a first color light La through the first color resistor 111a, and the backlight light L0 emitted from the blue backlight module 2 is converted into a second color light Lb through the second color resistor 111b, wherein the colors of the first color light La, the second color light Lb and the blue light are different. The color resistors 111 further include a third color resistor 111c, and the backlight light L0 emitted by the blue backlight module 2 passes through the third color resistor 111c to emit blue light Lc. Fig. 6 only takes the multiplexing of the conversion layer 4 as the color resistor 111 as an example, but the invention does not make specific requirements on whether the conversion layer 4 and the color resistor 111 are arranged in the same layer, and the setting can be performed according to actual situations, which is not described in detail below.

It can be understood that, since the backlight module 2 is a blue backlight module, and further the third color resistor 111c does not need to be doped with quantum dots, it is enough to normally emit blue light without changing the wavelength thereof, so that the display device can emit red light, green light and blue light, and further the color display of the display device 200 is realized.

In some alternative embodiments, referring to fig. 7 and fig. 8, fig. 7 is a schematic structural diagram of another display device provided by the present invention, and fig. 8 is a schematic structural diagram of another display device provided by the present invention. In the display device 200 provided in this embodiment, the conversion layer 4 includes the first transparent substrate 41 and the phosphor doped in the first transparent substrate 41.

It can be understood that, as shown in fig. 7, the conversion layer 4 includes the first transparent substrate 41 and the phosphor powder doped in the first transparent substrate 41, so that the conversion layer 4 can convert the light L pointing to the backlight module 2 from the light emitting surface Q of the display device 200 from a first wavelength to a second wavelength, and the second wavelength is greater than the first wavelength; that is, the light L reflected back by the finger is converted into the second wavelength from the first wavelength, the light L includes the first light L1 and the second light L2, the first light L1 is the light with the first wavelength, the second light L2 is the light with the second wavelength, the first light L1 and the second light L2 are two states of one light, the first light L1 is the state when the light L does not pass through the conversion layer 4, and the second light L2 is the state when the light L passes through the conversion layer 4. Because the light sensing element O has different recognition capabilities for light rays with different wavelengths, the sensitivity for recognizing a long wavelength band in the fingerprint signal light is good, and the recognition efficiency for blue light rays with a short wavelength band in the fingerprint signal light is very low, in this embodiment, the light ray L reflected back by the finger by the conversion layer 4 is converted from the first wavelength to the second wavelength, so that the second light ray L2 received by the light sensing element O is all long wavelength band light, and the sensitivity and the accuracy of the light sensing element O can be improved. As shown in fig. 8, the conversion layer 4 includes a first transparent substrate 41 and phosphor powder doped in the first transparent substrate 41, so that the conversion layer 4 can convert the light L pointing to the backlight module 2 from the light emitting surface Q of the display device 200 from a first wavelength to a second wavelength, where the second wavelength is greater than the first wavelength; further, the light module 2 is a blue backlight module, and further the stray light L ' is also blue stray light L ', since the light sensing element O has different identification capabilities for light rays with different wavelengths, the identification sensitivity for long wavelength bands in fingerprint signal light is good, and the identification efficiency for blue light of short wavelength bands in the signal is very low, the influence of the blue stray light L ' emitted by the blue backlight 2 on the light sensing element O is low, and further the improvement of the sensitivity and accuracy of the light sensing element O can be facilitated.

Optionally, the concentration of the phosphor in the first transparent substrate 41 is 20-30%, and the concentration of the phosphor in the first transparent substrate 41 is set in the range of 20-30%, so that the conversion layer 4 can convert the light L pointing to the backlight module 2 from the light-emitting surface Q of the display device 200 from the first wavelength to the second wavelength, and the length range of the second wavelength is 600-700nm, which can further improve the sensitivity and accuracy of the light-sensing element O.

In some alternative embodiments, referring to fig. 9 and fig. 10, fig. 9 is a schematic structural diagram of another display device provided by the present invention, and fig. 10 is a schematic structural diagram of another display device provided by the present invention. In the display device 200 provided in this embodiment, the conversion layer 4 includes the second transparent matrix 42 and the quantum dots doped in the second transparent matrix 42.

It can be understood that, as shown in fig. 9, the conversion layer 4 includes the second transparent substrate 42 and the quantum dots doped in the second transparent substrate 42, so that the conversion layer 4 can convert the light L pointing to the backlight module 2 from the light-emitting surface Q of the display device 200 from a first wavelength to a second wavelength, where the second wavelength is greater than the first wavelength; that is, the light L reflected back by the finger is converted into the second wavelength from the first wavelength, the light L includes the first light L1 and the second light L2, the first light L1 is the light with the first wavelength, the second light L2 is the light with the second wavelength, the first light L1 and the second light L2 are two states of one light, the first light L1 is the state when the light L does not pass through the conversion layer 4, and the second light L2 is the state when the light L passes through the conversion layer 4. Because the light sensing element O has different recognition capabilities for light rays with different wavelengths, the sensitivity for recognizing a long wavelength band in the fingerprint signal light is good, and the recognition efficiency for blue light rays with a short wavelength band in the fingerprint signal light is very low, in this embodiment, the light ray L reflected back by the finger by the conversion layer 4 is converted from the first wavelength to the second wavelength, so that the second light ray L2 received by the light sensing element O is all long wavelength band light, and the sensitivity and the accuracy of the light sensing element O can be improved. As shown in fig. 10, the conversion layer 4 includes a second transparent substrate 42 and quantum dots doped in the second transparent substrate 42, so that the conversion layer 4 can convert the light L pointing to the backlight module 2 from the light-emitting surface Q of the display device 200 from a first wavelength to a second wavelength, where the second wavelength is greater than the first wavelength; further, the light module 2 is a blue backlight module, and further the stray light L ' is also blue stray light L ', since the light sensing element O has different identification capabilities for light rays with different wavelengths, the identification sensitivity for long wavelength bands in fingerprint signal light is good, and the identification efficiency for blue light of short wavelength bands in the signal is very low, the influence of the blue stray light L ' emitted by the blue backlight 2 on the light sensing element O is low, and further the improvement of the sensitivity and accuracy of the light sensing element O can be facilitated.

Optionally, the concentration of the quantum dots in the second transparent substrate is 10% -16%. The concentration of the quantum dots in the second transparent substrate is set within a range of 10% -16%, so that the conversion layer 4 can convert the light L pointing to the backlight module 2 from the light-emitting surface Q of the display device 200 from the first wavelength to the second wavelength, and the length of the second wavelength is within a range of 600 nm and 700nm, thereby further improving the sensitivity and accuracy of the light-sensitive element O.

In some alternative embodiments, and as shown in continued reference to fig. 9 and 10, the present embodiment provides a display device 200 with a conversion layer 4 comprising a second transparent matrix 42 and quantum dots incorporated within the second transparent matrix 42. And the diameter of the quantum dots ranges from 5nm to 6 nm.

It can be understood that the diameter range of the quantum dots is set within the range of 5nm to 6nm, so that the conversion layer 4 can convert the light L pointing to the backlight module 2 from the light-emitting surface Q of the display device 200 from the first wavelength to the second wavelength, and the length range of the second wavelength is 600 nm and 700nm, which can further improve the sensitivity and accuracy of the light-sensing element O.

In some alternative embodiments, as shown in fig. 2, 4 and 5, the conversion layer 4 in the display device 200 provided in this embodiment is disposed on the same layer as any one of the first substrate 11 and the second substrate 12.

It is to be understood that the conversion layer 4 may be provided in the same layer as either the first substrate 11 or the second substrate 12. With reference to fig. 2, the first substrate 11 may include a planarization layer 00, the material of the planarization layer 00 may be an organic material or an inorganic material, and fig. 2 only illustrates that the conversion layer 4 and the planarization layer 00 are disposed on the same layer, which may be the same as the planarization layer 00, thereby facilitating the simplification of the process and the thinning of the display device 200. With reference to fig. 5, fig. 5 only shows that the conversion layer 4 and the color resistor 111 are disposed in the same layer, which can be manufactured in the same process as the color resistor 111, thereby facilitating the simplification of the manufacturing process and the thinning of the display device 200. The specific position of the conversion layer 4 is not specifically required, and the light L can be set according to actual conditions as long as the light L can penetrate through the conversion layer 4 to convert the wavelength, which is not described in detail below.

In some alternative embodiments, as shown in fig. 2, the light L in the display device 200 provided in this embodiment is a fingerprint identification light.

It can be understood that, when the finger touches the display screen, the light ray reflects when shining the valley line and the ridge line of finger fingerprint, because the reflection angle of valley line and ridge line and the illumination intensity that reflects back are different, projects fingerprint identification light L after the reflection of finger to light sense element O after passing through fretwork portion 31 on, and light sense element O transmits received sensing signal to fingerprint identification signal receiving unit (not shown in the figure) through the fingerprint signal line to make fingerprint identification signal receiving unit discern the valley line and the ridge line of fingerprint according to the signal received, carry out fingerprint identification.

In some optional embodiments, with reference to fig. 2 and 4, in the display device 200 provided in this embodiment, the display device 200 further includes a conversion layer 4, an orthographic projection of the conversion layer 4 on the first substrate 11 at least partially overlaps with an orthographic projection of the hollow portion 31 on the first substrate 22, and the conversion layer 4 is configured to convert a light L pointing to the backlight module 2 direction from the light emitting surface Q of the display device 200 from a first wavelength to a second wavelength, where the second wavelength is greater than the first wavelength. The second wavelength range 600-700 nm.

It can be understood that the light L reflected back by the finger is converted from the first wavelength to the second wavelength, the light L includes a first light L1 and a second light L2, the first light L1 is the light of the first wavelength, the second light L2 is the light of the second wavelength, the first light L1 and the second light L2 are two states of one light, the first light L1 is the state when the light L does not pass through the conversion layer 4, and the second light L2 is the state when the light L passes through the conversion layer 4. The light L reflected by the finger is converted from the first wavelength to the second wavelength by the conversion layer 4, so that the second light L2 received by the light sensing element O is all long-wavelength light, and the sensitivity and accuracy of the light sensing element O can be further improved. Moreover, because the light sensing element O has different identification capabilities for light rays with different wavelengths, the sensitivity for identifying the long wave band in the fingerprint signal light is good, the efficiency for identifying the blue light with the short wave band in the signal is very low, and the second wavelength of the second light ray L2 is limited within the range of 600-700nm, so that the sensitivity and the accuracy of the light sensing element O can be further improved.

As can be seen from the above embodiments, the display device provided by the present invention at least achieves the following beneficial effects:

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A display device is characterized by comprising a display panel and a backlight module which are oppositely arranged, wherein the display panel comprises a first substrate and a second substrate which are oppositely arranged, and the second substrate is positioned between the first substrate and the backlight module;

the display panel further comprises a collimating hole unit, wherein the collimating hole unit penetrates through partial film layers of the first substrate and the second substrate in a first direction, and the first direction is a direction perpendicular to the display panel;

the collimating hole unit comprises a hollow part and a light shielding part, and the orthographic projection of the light shielding part on the first substrate surrounds the orthographic projection of the hollow part on the first substrate;

the first substrate comprises a plurality of light sensing elements, orthographic projections of the light sensing elements on the first substrate are at least partially overlapped with orthographic projections of the hollow parts on the first substrate, and the light sensing elements are used for receiving light rays for identification;

the display device further comprises a conversion layer, the conversion layer is used for converting the light rays pointing to the direction of the backlight module from the light-emitting surface of the display device from a first wavelength to a second wavelength, and the orthographic projection of the conversion layer on the first substrate is at least partially overlapped with the orthographic projection of the hollow part on the first substrate;

wherein the second wavelength is greater than the first wavelength.

2. The display device according to claim 1, wherein the backlight module is a blue backlight module;

the first substrate is a color film substrate which comprises a color resistor, and the orthographic projection of the shading layer on the plane of the second substrate is arranged around the orthographic projection of the color resistor on the plane of the second substrate;

the color resistor comprises a first color resistor and a second color resistor, the first color resistor is doped with first quantum dots, and the second color resistor is doped with second quantum dots;

the backlight light emitted by the blue backlight module is converted into first color light through the first color resistor, the backlight light emitted by the blue backlight module is converted into second color light through the second color resistor, and the colors of the first color light, the second color light and the blue light are different.

3. The display device of claim 2, wherein the first color light is red light, the second color light is green light, and the diameter of the first quantum dot is larger than the diameter of the second quantum dot.

4. The display device as claimed in claim 2, wherein the color resistors further comprise a third color resistor, and the backlight light emitted from the blue backlight module passes through the third color resistor to emit the blue light.

5. A display device as claimed in claim 1 or 2, characterized in that the conversion layer comprises a first transparent matrix and a phosphor incorporated in the first transparent matrix.

6. The display device according to claim 1 or 2, wherein the conversion layer comprises a second transparent matrix and quantum dots incorporated in the second transparent matrix.

7. The display device according to claim 6, wherein the quantum dots have a diameter in a range of 5nm to 6 nm.

8. The display device according to claim 1 or 2, wherein the conversion layer is disposed in the same layer as any one of the first substrate or the second substrate.

9. The display device of claim 1, wherein the light is a fingerprint recognition light.

10. The display device as claimed in claim 1, wherein the wavelength range of the second wavelength is 600-700 nm.