CN210666264U

CN210666264U - Display screen assembly and terminal equipment

Info

Publication number: CN210666264U
Application number: CN201921331089.4U
Authority: CN
Inventors: 胡现坤
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2019-08-15
Filing date: 2019-08-15
Publication date: 2020-06-02
Anticipated expiration: 2029-08-15

Abstract

The application provides a display screen assembly and terminal equipment, wherein the display screen assembly comprises a display panel, a backlight structure and a fingerprint light source, the backlight structure of the backlight structure comprises a backlight film material, a first frame used for supporting the backlight film material and a backlight source, and the backlight source is arranged on the surface, facing the display panel, of the first frame; the fingerprint light source is arranged on the surface, facing the display panel, of the first frame, light generated by the fingerprint light source can penetrate through the display panel, and the light emitting direction of the fingerprint light source and the light emitting direction of the backlight source meet the preset angle relationship. In the application, light generated by the fingerprint light source is used as detection light for underscreen fingerprint identification so as to realize underscreen fingerprint identification of the LCD display screen.

Description

Display screen assembly and terminal equipment

Technical Field

The application relates to the field of electronic equipment, in particular to a display screen assembly and terminal equipment.

Background

The technology for identifying fingerprints under the screen has the advantages of safety and convenience, and meanwhile, the screen occupation ratio of the display screen cannot be influenced, so that the technology is popular with consumers. At present, the technology for identifying fingerprints under a screen is widely applied to mobile phones with OLED display screens, but the mobile phones with OLED display screens are all medium-high end mobile phones generally, and how to apply the technology for identifying fingerprints under a screen to mobile phones with LCD display screens and other screens becomes a problem to be solved urgently. The backlight structure of LCD display screen has reverse non-penetrability to visible light, leads to LCD display screen from the backlight of taking can't provide the light source for the fingerprint identification module, can't realize the screen fingerprint identification under the LCD display screen and other display screens that have opaque backlight structure.

SUMMERY OF THE UTILITY MODEL

The application provides a display screen assembly and terminal equipment, which are provided with a light source for fingerprint identification under a screen.

The application provides a display screen assembly, which comprises a display panel, a backlight structure and a fingerprint light source, wherein the backlight structure comprises a backlight film material, a first frame for supporting the backlight film material and a backlight source, and the backlight source is arranged on the surface of the first frame facing the display panel; the fingerprint light source is arranged on the surface, facing the display panel, of the first frame, light generated by the fingerprint light source can penetrate through the display panel, and the light emitting direction of the fingerprint light source and the light emitting direction of the backlight source meet the preset angle relationship.

Furthermore, the light-emitting direction of the fingerprint light source is perpendicular to the light-emitting direction of the backlight source.

Furthermore, the light emitting direction of the fingerprint light source is perpendicular to the display panel.

Further, the position of the fingerprint light source is closer to the edge of the display screen component than the position of the backlight source.

Further, the fingerprint light source includes a plurality of fingerprint sub-light sources, the backlight includes a plurality of sub-light sources in a poor light, wherein, a plurality of back light sub-light sources with a plurality of fingerprint sub-light sources all arrange along first direction, first direction perpendicular to the light-emitting direction of fingerprint light source just is on a parallel with display panel.

Further, the distance between two adjacent fingerprint sub-light sources is greater than the distance between two adjacent back-light sub-light sources.

Further, the field angle of the fingerprint light source ranges from 120 degrees to 140 degrees.

Further, the display screen assembly further comprises: the light shielding structure is positioned above the backlight source and the fingerprint light source, at least part of light generated by the fingerprint light source can penetrate through the light shielding structure, and the light shielding structure is used for blocking the light generated by the backlight source to penetrate.

Further, the shading structure comprises a shading film arranged above the backlight source and the fingerprint light source.

Further, the display screen assembly further comprises: a first TFT layer, and a second TFT layer; the bonding layer positioned between the first TFT layer and the second TFT layer can transmit the light generated by the fingerprint light source and is impermeable to the light generated by the backlight source; and/or a black matrix between the first and second TFT layers, the black matrix being transmissive to light generated by the fingerprint light source and opaque to light generated by the backlight.

The present application further provides a terminal device, including: fingerprint identification module and as before the display screen subassembly, the fingerprint light source be used for fingerprint identification module carries out fingerprint identification and provides the light source.

Further, still including being used for supporting the second frame of display screen subassembly, the second frame is provided with the second opening, biological identification module is fixed in the second opening.

In the application, light generated by the fingerprint light source is used as detection light for underscreen fingerprint identification so as to realize underscreen fingerprint identification of the LCD display screen.

Drawings

FIG. 1 is a schematic view, partially in section, of one embodiment of a display screen assembly of the present application.

Fig. 2 is a schematic diagram of a backlight structure and a fingerprint light source of the display panel assembly shown in fig. 1.

FIG. 3 is a schematic view, partially in section, of one embodiment of the claimed display screen assembly.

Fig. 4 is a schematic front view of an embodiment of a terminal device according to the present application.

Fig. 5 is a partially cross-sectional schematic view of the terminal device shown in fig. 4.

Fig. 6 is a schematic diagram of fingerprint recognition performed by the terminal device according to the present application.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

Referring to fig. 1 to 5, the present application provides a display screen assembly and a terminal device, where the display screen includes a display panel, a backlight structure and a fingerprint light source, the backlight structure includes a backlight film, a first frame for supporting the backlight film, and a backlight source, and the backlight source is disposed on a surface of the first frame facing the display panel; the fingerprint light source is arranged on the surface, facing the display panel, of the first frame, light generated by the fingerprint light source can penetrate through the display panel, and the light emitting direction of the fingerprint light source and the light emitting direction of the backlight source meet the preset angle relationship.

Optionally, in this embodiment, the light emitting surface of the fingerprint light source is in a regular form, and the light emitting direction of the fingerprint light source is used for representing the direction of the center line of the light emitting surface of the fingerprint light source in the light emitting direction; the light-emitting surface of the backlight source is in a regular form, and the light-emitting direction of the backlight source is used for representing the direction of the central line of the light-emitting surface of the backlight source in the light-emitting direction. Optionally, the light-emitting direction of the fingerprint light source and the light-emitting direction of the backlight satisfy a vertical or nearly vertical relationship.

Preferably, the light emitting direction of the fingerprint light source is perpendicular to the light emitting direction of the backlight source.

In this embodiment, the direction of the backlight structure 2 pointing to the display panel 3 is an upward direction, and the direction of the display panel 3 pointing to the backlight structure 2 is a downward direction.

Referring to fig. 1, the display screen assembly 100 includes a fingerprint light source 1, a backlight structure 2 and a display panel 3. The display panel 3 has a light exit surface 30 (i.e., an upper surface), and the visible light generated by the backlight structure 2 is guided out from the light exit surface 30, so that the display panel assembly 100 is in a light emitting state.

Referring to fig. 2, the backlight structure 2 includes a first frame 21, a backlight source 22 and a backlight film 23. The first frame 21 is used to support the backlight source 22, the backlight film 23 and the display panel 3, and in this embodiment, the first frame 21 is an iron frame. The backlight 22 is disposed on a surface of the first frame 21 facing the display panel 3. The backlight film material 23 may include a reflective film, a brightness enhancement film, a diffusion film, and the like. The first frame 21 is provided with a first opening 210, and the detection light for fingerprint recognition can pass through the first opening 210.

Optionally, the backlight source 22 includes a plurality of backlight sub-light sources 221 arranged along a first direction Y, a light emitting direction of the backlight sub-light sources 221 is a second direction X perpendicular to the first direction Y, and the first direction Y and the second direction X are parallel to the display panel 3. The fingerprint light source 1 comprises a plurality of fingerprint sub-light sources 11 arranged along a first direction Y, the fingerprint sub-light sources 11 being configured to emit detection light, such as infrared light. The light-emitting direction of the fingerprint light source 1 is perpendicular to the light-emitting direction of the backlight source 22, optionally, the light-emitting direction of the fingerprint light source 1 is perpendicular to the display panel 3, the first direction Y and the second direction X, the light-emitting direction of the backlight source 22 is parallel to the display panel 3, and visible light generated by the backlight source 22 is guided out of the display panel 3 through the light guide plate (not shown) in a backward direction. It should be noted that "perpendicular" here should be understood that at least a portion of the light generated by the fingerprint light source 3 is perpendicular to the display panel and the first and second directions Y and X.

Alternatively, since the backlight sub-light source 221 serves as a light source of the entire display panel assembly and the fingerprint sub-light source 11 serves only as a light source for fingerprint recognition, the luminous flux generated by the backlight sub-light source 221 is generally higher than that of the fingerprint sub-light source 11. In this embodiment, the number of backlight sub-light sources 221 is greater than the number of fingerprint sub-light sources 11, so as to provide enough visible light, and the distance between adjacent backlight sub-light sources 221 is less than the distance between adjacent fingerprint sub-light sources 11, so that the backlight sub-light sources 221 are more densely distributed.

The fingerprint light source 1 is also disposed on the surface of the first frame 21 facing the display panel 3, and in this embodiment, the backlight 22 is disposed coplanar with the fingerprint light source 1 (the thicknesses of the two are approximately ignored). The fingerprint light source 1 is used for generating infrared light, and the infrared light can penetrate through the display panel 3 for fingerprint identification. Since the infrared light generated by the fingerprint light source 1 does not need to penetrate the first frame 21, the first frame 21 does not need to be an infrared light opening, which is beneficial to improving the strength of the first frame 21.

Optionally, the fingerprint light source 1 is located closer to the edge of the display screen assembly 100 than the backlight 22. Optionally, the backlight 22 is located between the plurality of fingerprint light sources 1 and the geometric center of the display screen assembly, so as to ensure that the light emitted from the backlight 22 and the light emitted from the fingerprint light sources 1 do not affect each other.

Preferably, in the embodiment, the Field of View (FOV) of the fingerprint light source 1 ranges from 120 degrees to 150 degrees, a larger FOV can increase the light outgoing area of the infrared light, and when the user's finger is placed in the light outgoing area, the infrared light is reflected by the hand and then transmitted to the fingerprint recognition module, that is, the detection area of fingerprint recognition is favorably expanded.

Optionally, the wavelength range of the infrared light generated by the fingerprint light source 1 is 800nm to 1200 nm. Preferably, the wavelength of the infrared light in this embodiment is 940 nm.

Optionally, the display panel 3 includes a first TFT (thin film transistor) layer 31, a liquid crystal layer 32, a second TFT layer 33, a Color Filter (CF) 34, and an optical adhesive layer 35, which are located above the backlight structure 2 and sequentially arranged. After the display screen assembly is electrified, the electric field is used for controlling the rotation of the liquid crystal to change the advancing direction of light, so that different colors can be formed by different electric field sizes.

Optionally, the display panel assembly 100 further includes a light shielding structure located above the backlight sub-light source 221 and the fingerprint sub-light source 11, where the light shielding structure allows at least part of the light generated by the fingerprint sub-light source 11 to penetrate through the light shielding structure, and blocks the light generated by the backlight sub-light source from passing through, and since the light shielding structure is usually located below the non-display area B, that is, the backlight sub-light source 221 and the fingerprint sub-light source 11 are both located below the non-display area B of the display panel, but not in the display area a.

Preferably, the light shielding structure of the present embodiment is a light shielding film 4, and the light shielding film 4 is disposed above the back light sub-light source 221 and the fingerprint sub-light source 11, and may be located at the same layer as a certain layer (for example, a brightness enhancement film) of the back light film material. Alternatively, the light shielding film 4 may be made of Polycarbonate (PC) or polymethyl methacrylate (PMMA).

Optionally, the first TFT layer 31 and the second TFT layer 33 are connected by a bonding layer 5, the bonding layer 5 is located between the first TFT layer 31 and the second TFT layer 33 and is in the same layer as the liquid crystal layer 32, so as to prevent liquid crystal from flowing out, the bonding layer 5 allows infrared light generated by the fingerprint light source 1 to pass through, and visible light generated by the backlight 22 cannot pass through. Alternatively, the adhesive layer 5 may be made of polycarbonate or polymethyl methacrylate.

Optionally, a black matrix 6 is further disposed between the first TFT layer 31 and the second TFT layer 33, the black matrix 6 is located on a lower surface of the first TFT layer 31, and the black matrix 6 allows infrared light generated by the fingerprint light source 1 to pass through, but does not allow visible light generated by the backlight 22 to pass through. Alternatively, the black matrix 6 may be made of polycarbonate or polymethylmethacrylate, or the like.

In this embodiment, the light shielding film 4, the adhesive layer 5, and the black matrix 6 can be all regarded as a part of the display panel.

In the above embodiment, because the fingerprint light source 1 providing the light source for the fingerprint module is integrated into the backlight structure, the space required by the fingerprint identification module (including the fingerprint identification module 200 and the fingerprint sub-light source 11) is saved, and a larger space is reserved for other elements of the terminal device. Compared with the arrangement of the fingerprint sub-light source 11 and the fingerprint identification module 200, the first frame 21 does not need to be provided with a light outlet (infrared light cannot penetrate through the first frame) for the fingerprint sub-light source 11, which is beneficial to improving the strength of the first frame 21; on the other hand, infrared light generated by the fingerprint sub-light source 11 does not need to penetrate through a backlight structure, so that light loss is smaller, and the efficiency of fingerprint unlocking is improved.

The application also provides a terminal device, and the terminal device is an electronic device with a display screen component, such as a mobile phone, a tablet computer and a smart watch. Referring to fig. 4 and 5, the terminal device of the present embodiment is a mobile phone, which includes a second frame 300, a protective cover 400 and the display screen assembly 100 of any of the foregoing embodiments, and the fingerprint light source 1 is used for providing a light source for the fingerprint identification module 200 to perform fingerprint identification. The display screen assembly is supported by the second frame 300, and the second frame 300 can be understood as a middle frame of a mobile phone in a general sense. The protective cover 400 covers the display screen assembly 100 to reduce direct impact of the outside on the display screen assembly 100, thereby protecting the display screen assembly. The second frame 300 is provided with a second opening 301, the fingerprint identification module 200 is fixed in the second opening 301, the second opening 301 faces the first opening 210, and the fingerprint identification module 200 receives infrared light reflected by a human body through the second opening and the first opening.

Fig. 6 shows the light path diagram of infrared light during fingerprint identification, in which the light path of infrared light is consistent with the ambient light path and has a positive superposition effect, so that the interference of ambient light can be reduced. Because the fingerprint light source 1 that provides the infrared light for the fingerprint identification module is integrated to backlight structure in, be favorable to saving the required space of fingerprint identification module (including fingerprint identification module 200 and fingerprint sub-light source 11), reserve bigger space for other components of terminal equipment. Compared with the arrangement of the fingerprint sub-light source 11 and the fingerprint identification module 200, the arrangement of the light emitting holes (infrared light cannot penetrate through the first frame 21 and the second frame 300) for the fingerprint sub-light source 11 on the first frame 21 and the second frame 300 is not needed, which is beneficial to improving the strength of the first frame and the second frame; on the other hand, infrared light generated by the fingerprint sub-light source 11 does not need to penetrate through a backlight structure, so that light loss is smaller, and the efficiency of fingerprint unlocking is improved.

Although the present application has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application, and all changes, substitutions and alterations that fall within the spirit and scope of the application are to be understood as being covered by the following claims.

Claims

1. A display screen assembly, comprising:

a display panel;

the backlight structure comprises a backlight film, a first frame for supporting the backlight film and a backlight source, wherein the backlight source is arranged on the surface, facing the display panel, of the first frame;

the fingerprint light source is arranged on the surface, facing the display panel, of the first frame, light generated by the fingerprint light source can penetrate through the display panel, and the light emitting direction of the fingerprint light source and the light emitting direction of the backlight source meet the preset angle relationship.

2. The display screen assembly of claim 1, wherein a light exit direction of the fingerprint light source is perpendicular to a light exit direction of the backlight source.

3. The display screen assembly of claim 1, wherein a light exit direction of the fingerprint light source is perpendicular to the display panel.

4. A display screen assembly according to any of claims 1 to 3, wherein the fingerprint light source is located closer to an edge of the display screen assembly than the backlight source.

5. The display screen assembly of claim 4, wherein the fingerprint light source comprises a plurality of fingerprint sub-light sources, the backlight source comprises a plurality of backlight sub-light sources, and wherein the plurality of backlight sub-light sources and the plurality of fingerprint sub-light sources are arranged along a first direction, the first direction being perpendicular to a light exit direction of the fingerprint light sources and parallel to the display panel.

6. The display screen assembly of claim 5, wherein the distance between two adjacent fingerprint sub-light sources is greater than the distance between two adjacent backlight sub-light sources.

7. The display screen assembly of claim 1, wherein the fingerprint light source has a field of view angle in a range of 120 degrees to 140 degrees.

8. The display screen assembly of any one of claims 1-3, 7, further comprising:

the light shielding structure is positioned above the backlight source and the fingerprint light source, at least part of light generated by the fingerprint light source can penetrate through the light shielding structure, and the light shielding structure is used for blocking the light generated by the backlight source to penetrate.

9. The display screen assembly of claim 4, further comprising:

10. The display screen assembly of claim 5, further comprising:

11. The display screen assembly of claim 6, further comprising:

12. The display screen assembly of claim 8, wherein the light blocking structure comprises a light blocking film disposed over the backlight source and the fingerprint light source.

13. The display screen assembly of claim 9, wherein the light blocking structure comprises a light blocking film disposed over the backlight source and the fingerprint light source.

14. The display screen assembly of claim 10, wherein the light blocking structure comprises a light blocking film disposed over the backlight source and the fingerprint light source.

15. The display screen assembly of claim 11, wherein the light blocking structure comprises a light blocking film disposed over the backlight source and the fingerprint light source.

16. The display screen assembly of any one of claims 1-3, 7, further comprising:

a first Thin Film Transistor (TFT) layer, and a second TFT layer; wherein the content of the first and second substances,

the bonding layer positioned between the first TFT layer and the second TFT layer can transmit the light generated by the fingerprint light source and is impermeable to the light generated by the backlight source; and/or

The black matrix located between the first TFT layer and the second TFT layer is capable of transmitting light generated by the fingerprint light source and is impermeable to light generated by the backlight source.

17. A terminal device, comprising: fingerprint identification module and display screen assembly of any one of claims 1-16, fingerprint light source is used for providing the light source for fingerprint identification module carries out fingerprint identification.

18. The terminal device of claim 17, further comprising a second frame for supporting the display screen assembly, the second frame being provided with a second opening, the fingerprint identification module being secured to the second opening.