CN112198712A

CN112198712A - Backlight module and display device

Info

Publication number: CN112198712A
Application number: CN202011109166.9A
Authority: CN
Inventors: 程艳; 周伟
Original assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Priority date: 2020-10-16
Filing date: 2020-10-16
Publication date: 2021-01-08

Abstract

The invention discloses a backlight module and a display device, wherein the backlight module comprises: an optical film layer including a light-transmitting region; the sensor is arranged at the bottom of the optical film layer and is opposite to the light hole; and a plurality of light sources surrounding the sensor. The invention has the technical effects that light beams can directly penetrate through the light-transmitting area, the interference of a reflecting sheet and a diffusion sheet is avoided, and the light transmittance is improved.

Description

Backlight module and display device

Technical Field

The invention relates to the field of display, in particular to a backlight module and a display device.

Background

The technology of the under-screen fingerprint of a Liquid Crystal Display (LCD) is mainly designed by an infrared fingerprint film of a client (for example, 3M), so that the cost is high, the under-screen fingerprint is monopolized by the client, the fingerprint identification effect is not ideal, the identification is realized by arranging an IR LED on the side edge, the frame width (border) of a lower module is increased, and the attractiveness of the whole machine and the design of a full-face screen are influenced.

Disclosure of Invention

The invention aims to solve the technical problem of poor fingerprint identification effect in the liquid crystal display device in the prior art.

To achieve the above object, the present invention provides a backlight module, comprising: an optical film layer including a light-transmitting region; the sensor is arranged at the bottom of the optical film layer and is opposite to the light hole; and a plurality of light sources surrounding the sensor.

Further, a prism layer is arranged in the optical film layer, the prism layer is provided with a prism structure and a non-prism structure, and the non-prism structure is located in the light-transmitting area.

Further, the non-prismatic structures are filled with structures of optical glue.

Further, the non-prismatic structure is a convex structure.

Further, the optical film layer further includes: the reflecting sheet is arranged on one side, close to the sensor, of the prism layer; and the diffusion sheet is arranged on one side of the reflection sheet far away from the sensor.

Further, the reflector plate and the diffusion plate are provided with light transmission holes, and the light transmission holes are located in the light transmission area.

Furthermore, the optical film layer further comprises a light guide plate which is arranged between the reflecting sheet and the diffusion sheet, and the light guide plate is of a transparent structure.

Furthermore, the optical film layer also comprises a second diffusion sheet arranged on the surface of one side of the prism layer far away from the first diffusion sheet

To achieve the above object, the present invention further provides a display device including the backlight module as described above.

Furthermore, the display device also comprises a display panel which is arranged on one side of the backlight module, which is far away from the light source of the backlight module; the display panel comprises a fingerprint touch area, and the fingerprint touch area is opposite to the light-transmitting area of the backlight module and the sensor.

The invention has the technical effect that the direct type backlight module is adopted to meet the requirement of the liquid crystal display device on a narrow frame. Set up the printing opacity district on the optics rete, locate sensor and light source the below in printing opacity district, the light beam can directly see through the printing opacity district has avoided the interference of reflector plate and diffusion piece, improves the light transmissivity, and need not to rely on customer's infrared fingerprint membrane material to design, reduces the cost of manufacture of product.

Drawings

The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.

Fig. 1 is a schematic view of a display device according to

embodiment

1 or 2 of the present invention;

FIG. 2 is a schematic view of a prism layer according to example 1 of the present invention;

FIG. 3 is a schematic view of a prism layer according to example 2 of the present invention;

fig. 4 is a top view of a bottom plate of a backlight module according to

embodiment

1 or 2 of the present invention.

Some of the components are identified as follows:

1. a backlight module; 2. a display panel;

11. an optical film layer; 12. a base plate; 13. a sensor; 14. a light source;

111. a reflective sheet; 112. a light guide plate; 113. a first diffusion sheet; 114. a prism layer; 115. a light-transmitting region;

141. a raised structure; 142. optical cement; 143. a prism structure;

21. fingerprint touch area.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

Example 1

Specifically, referring to fig. 1, fig. 2 and fig. 4, an embodiment of the invention provides a display device, which includes a backlight module 1 and a display panel 2.

The backlight module 1 includes an optical film 11, a bottom plate 12, a sensor 13 and a light source 14, and the backlight module 1 plays a role of controlling a light path.

The optical film 11 includes a reflective sheet 111, a light guide plate 112, a first diffusion sheet 113, a prism layer 114, and a second diffusion sheet, and the optical film 11 is used for controlling uniformity of light. The optical film layer 11 includes a light-transmitting region 115, which has a good light-transmitting effect.

The reflective sheet 111 has a reflective function, and as the bottom layer of the optical film 11, the reflective sheet can reflect the light rays incident downwards, enhance the amount of the light rays emitted upwards, and improve the utilization rate of the light rays. The reflective sheet 111 has a light transmission hole formed therein and disposed in the light transmission region 115, and the light transmission hole allows light to pass therethrough without obstruction.

The light guide plate 112 is disposed on the upper surface of the reflective sheet 111, and plays a role of homogenizing light, so that light incident from the light incident surface of the light guide plate 112 is uniformly emitted from the light emitting surface, and the light guide plate 112 is of a transparent structure, thereby reducing the loss rate of light as much as possible.

The first diffusion sheet 113 is disposed on the upper surface of the light guide plate 112 and functions to diffuse light. The first diffusion sheet 113 has light transmission holes provided in the light transmission region 115, which allow light to pass therethrough without obstruction.

The prism layer 114 is disposed on the upper surface of the first diffusion sheet 113, and functions to deflect light rays to the front viewing angle direction, collect light beams, and enhance the brightness of the display device, so it is also called a light-collecting sheet or a brightness enhancement film. The prism layer 114 has a prism structure 143 and a non-prism structure located in the light-transmitting region 115.

A second diffuser (not shown) may be further added on the upper surface of the prism layer 114 to achieve the effect of shading and scattering the viewing angle light at the light-transmitting holes.

As shown in fig. 2, in the embodiment, the non-prism structure is a protrusion structure 141, the protrusion structure 141 is specifically a boss structure, a longitudinal cross section of the boss structure is trapezoidal, the plurality of protrusion structures 141 are disposed in the light-transmitting region 115, when light passes through the protrusion structures 141, most of the light can directly pass through a gap between two protrusion structures 141, the rest of the light is refracted by the protrusion structures 141, and the light passing through the gap occupies most of the light, so that a light passing rate is improved, and the light-transmitting structure has good light-transmitting property.

The bottom plate 12 is disposed opposite to the optical film 11, specifically, below the optical film 11, and serves as a bottom plate of the backlight module 1 for mounting the light sources 13 and the sensors 14.

The sensor 14 is disposed opposite to the light-transmitting region 115 of the optical film 11, and is located below the optical film 11, and is a photosensitive sensor.

A light source 13 is arranged around the sensor 14 for emitting light, the light source 13 being pyramid shaped. When fingerprint identification is performed, the light beam emitted by the light source 13 passes through the light-transmitting area 115 of the optical film layer 11, is reflected by a fingerprint signal on the display panel 2, and the reflected light beam passes through the light-transmitting area 115 again and is sensed by the sensor 13, so that the existence of the light-transmitting area 115 is avoided, the interference of the light beam on the reflector 111 and the first diffusion sheet 113 in the transmission process is directly avoided, and the transmittance of light is improved.

Display panel 2 locates backlight unit 1's upper surface, display panel 2 includes fingerprint touch-control region 21, set up with backlight unit 1's light transmission area 115 relatively, display panel 2's fingerprint touch-control region 21 promptly, backlight unit 1's light transmission area 115 and sensor 14 are in same vertical region, external user's fingerprint is corresponding to fingerprint touch-control region 21, the light beam that backlight unit 1's light source 13 sent is returned the sensor after being reflected by the fingerprint, respond to external fingerprint, carry out fingerprint identification.

The direct type backlight module is adopted, and the requirement of the liquid crystal display device on a narrow frame is met. Set up light transmission area 115 on optical film layer 11, locate the below of light transmission area 115 with sensor 14 and light source 13, the light beam can directly see through light transmission area 115, has avoided the interference of reflector plate 111 and first diffusion piece 113, improves the light transmissivity, and need not to rely on customer's infrared fingerprint membrane to design, reduces the cost of manufacture of product.

Example 2

Specifically, referring to fig. 1, fig. 3 and fig. 4, an embodiment of the invention provides a display device, which includes a backlight module 1 and a display panel 2.

The optical film layer 11 includes a reflective sheet 111, a light guide plate 112, a diffusion sheet 113 and a prism layer 114, and the optical film layer 11 is used for controlling uniformity of light. The optical film layer 11 includes a light-transmitting region 115, which has a good light-transmitting effect.

As shown in fig. 3, in the present embodiment, the non-prism structure is formed by filling the optical adhesive 142 in the gap of the prism structure, the optical adhesive 142 is disposed in the light-transmitting region 115, and when passing through the non-prism structure, the light is emitted through the prism structure below the optical adhesive 142, and then is emitted after being scattered by the optical adhesive 142, so as to collect most of the light, improve the utilization rate of the light, improve the light passing rate, and have good light transmittance.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The backlight module and the display device provided by the embodiment of the invention are described in detail, and the principle and the embodiment of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the technical scheme and the core idea of the invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A backlight module, comprising:

an optical film layer including a light-transmitting region;

the sensor is arranged at the bottom of the optical film layer and is opposite to the light hole; and

a number of light sources surrounding the sensor.

2. The backlight module as claimed in claim 1, wherein the optical film layer has a prism layer having prism structures and non-prism structures, and the non-prism structures are located in the light-transmissive region.

3. The backlight module of claim 2, wherein the non-prismatic structures are filled with structures of optical glue.

4. The backlight module of claim 2, wherein the non-prismatic structures are raised structures.

5. The backlight module of claim 2, wherein the optical film layer further comprises:

the reflecting sheet is arranged on one side, close to the sensor, of the prism layer;

the first diffusion sheet is arranged on one side, far away from the sensor, of the reflection sheet.

6. The backlight module of claim 5,

the reflector plate and the diffusion plate are provided with light transmission holes, and the light transmission holes are located in the light transmission area.

7. The backlight module of claim 5, wherein the optical film layer further comprises

The light guide plate is arranged between the reflecting sheet and the diffusion sheet and is of a transparent structure.

8. The backlight module of claim 5, wherein the optical film layer further comprises

And the second diffusion sheet is arranged on the surface of one side of the prism layer, which is far away from the first diffusion sheet.

9. A display device comprising the backlight module according to any one of claims 1 to 8.

10. The display device as claimed in claim 9, further comprising a display panel disposed on a side of the backlight module away from the light source;

the display panel comprises a fingerprint touch area, and the fingerprint touch area is opposite to the light-transmitting area of the backlight module and the sensor.