WO2021136140A1

WO2021136140A1 - Display module and electronic device

Info

Publication number: WO2021136140A1
Application number: PCT/CN2020/139908
Authority: WO
Inventors: 杨刚
Original assignee: 维沃移动通信有限公司
Priority date: 2019-12-31
Filing date: 2020-12-28
Publication date: 2021-07-08
Also published as: CN111123569A

Abstract

A display module and an electronic device. The display module comprises a backlight source (1) and a display panel (2), and the backlight source (1) comprises a first light source (3) used for providing visible light and a second light source (4) used for providing invisible light. The display module further comprises a fingerprint sensing layer (5) which is disposed on the side of the display panel (2) facing away from the backlight source (1), wherein the fingerprint sensing layer (5) is used for receiving reflected light after being reflected by a finger above the display panel (2), and the reflected light is light emitted by the second light source (4) toward the display panel (2) after the invisible light is reflected.

Description

Display module and electronic equipment

Cross-references to related applications

This application claims the priority of Chinese Patent Application No. 201911421623.5 filed in China on December 31, 2019, the entire content of which is incorporated herein by reference.

Technical field

The present invention relates to the technical field of electronic equipment, in particular to a display module and electronic equipment.

Background technique

In recent years, full-screen mobile phones have become more and more popular, and as one of the full-screen implementations, optical fingerprints can only be applied to organic light-emitting semiconductor (Organic Light-Emitting Diode, OLED) displays. The use of OLED displays has always been provided. Due to the problems of goods and prices, an optical fingerprint design solution that can be applied to Thin Film Transistor (TFT) display screens is needed to achieve a wider range of optical fingerprint applications and cost savings.

In other words, optical fingerprint modules in the industry can only be applied to OLED display modules, not TFT display modules. OLED displays are expensive and difficult to supply.

Specifically, the reason why the TFT display module cannot use the existing photoelectric fingerprint is that the light reflected by the finger cannot reach the fingerprint module through the backlight (light guide plate of the backlight);

In other words, the existing display module has the problem that the optical fingerprint recognition function cannot be realized.

Summary of the invention

The purpose of the present invention is to provide a display module and an electronic device to solve the problem that the display module cannot realize the optical fingerprint recognition function in the prior art.

In order to solve the above technical problems, the present invention is implemented as follows:

In a first aspect, an embodiment of the present invention provides a display module, including a backlight source and a display panel, the backlight source including a first light source for providing visible light and a second light source for providing invisible light;

The display module further includes:

A fingerprint sensing layer disposed on a side of the display panel away from the backlight source, wherein the fingerprint sensing layer is used to receive reflected light reflected by a finger above the display panel;

The reflected light is the reflected light of the invisible light emitted by the second light source toward the display panel.

In a second aspect, an embodiment of the present invention also provides an electronic device, including: the above-mentioned display module.

In the embodiment of the present invention, by providing a display module, including a backlight source and a display panel, the backlight source includes a first light source for providing visible light and a second light source for providing invisible light; the display module is also It includes a fingerprint sensing layer, which is arranged on the side of the display panel facing away from the backlight, wherein the fingerprint sensing layer is used to receive reflected light reflected by a finger above the display panel; the reflected light is The invisible light emitted by the second light source toward the display panel is reflected light; it can ensure that the light used to sense fingerprints reaches the fingerprint sensing layer, thereby ensuring that the application of the optical fingerprint module on the display module can be realized. It is a good solution to the problem that the display module in the prior art cannot realize the optical fingerprint recognition function.

Description of the drawings

FIG. 1 is a first structural diagram of a display module according to an embodiment of the present invention;

2 is a schematic diagram of the arrangement of a first light source and a second light source according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the photosensitive element implementing the photosensitive function of the embodiment of the present invention;

4 is a second schematic diagram of the structure of the display module of the embodiment of the present invention;

FIG. 5 is a schematic diagram of the optical fingerprint recognition function implemented by the display module of the embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

Aiming at the problem that the display module cannot realize the optical fingerprint recognition function in the prior art, the present invention provides a display module, as shown in Figure 1, Figure 2, Figure 4 and Figure 5, including a backlight source 1 and a display panel 2. , The backlight source 1 includes a first light source 3 for providing visible light and a second light source 4 for providing invisible light; the display module also includes: a fingerprint sensing layer 5, which is disposed at the back of the display panel 2. One side of the backlight source 1, wherein the fingerprint sensing layer 5 is used to receive the reflected light reflected by the finger above the display panel 2; the reflected light is emitted by the second light source 4 toward the The invisible light of the display panel 2 is reflected light.

The display module provided by the embodiment of the present invention includes a backlight source and a display panel by providing a display module, and the backlight source includes a first light source for providing visible light and a second light source for providing invisible light; The display module further includes: a fingerprint sensing layer disposed on a side of the display panel away from the backlight source, wherein the fingerprint sensing layer is used to receive the reflected light reflected by a finger above the display panel; The reflected light is the reflected light of the invisible light from the second light source toward the display panel; it can ensure that the light used to sense fingerprints reaches the fingerprint sensing layer, thereby ensuring that the optical fingerprint module is in the display module ( For example, the application on the TFT display module can well solve the problem that the display module in the prior art cannot realize the optical fingerprint recognition function.

Further, as shown in FIG. 2, the backlight source 1 further includes a light guide plate 6. The first light source 3 and the second light source 4 are both arranged on the side surface of the light guide plate 6, and the side surface is connected to the light guide plate 6. The light-emitting surfaces of 6 are adjacent.

In this way, it can be ensured that the light from the first light source and the second light source are normally emitted to the display panel.

Specifically, as shown in FIG. 2, on one of the side surfaces of the light guide plate 6, the first light source 3 and the second light source 4 are arranged at intervals.

In this way, the display function of the display module can be ensured as much as possible, and the optical fingerprint recognition function can be better realized.

As shown in FIGS. 1, 4, and 5, the display panel 2 includes an array substrate 7, a color filter substrate 8, and a liquid crystal layer disposed between the array substrate 7 and the color filter substrate 8. (Not shown in the figure); the fingerprint sensing layer 5 is disposed on the side of the color filter substrate 8 away from the liquid crystal layer.

This can ensure the normal realization of the display function of the display module with the array substrate (ie, the TFT layer).

Specifically, as shown in FIG. 4, the fingerprint sensing layer 5 includes a plurality of photosensitive elements 9, and the orthographic projection of the plurality of photosensitive elements 9 on the color filter substrate 8 is located on the black of the color filter substrate 8. Matrix BM area.

That is, the sensing position in the fingerprint sensing layer does not coincide with the position of the red, green, and blue RGB pixels in the color filter substrate.

Further, as shown in FIGS. 1, 4, and 5, the display module further includes: a glass cover plate 10, the glass cover plate 10 is disposed on the fingerprint sensor layer 5 away from the color film One side of the substrate 8.

This can protect the fingerprint sensing layer and the display panel.

Furthermore, as shown in FIGS. 1, 4, and 5, the display module further includes: a polarizer 11, the polarizer 11 is disposed on the fingerprint sensing layer 5 and the glass cover 10 between.

In the embodiment of the present invention, as shown in FIG. 1, FIG. 4 and FIG. 5, the display module further includes: a binding (BD) area 12, and the fingerprint sensing layer 5 connects with each other through the binding area 12 The second external line connection.

This can ensure that the fingerprint sensing layer normally transmits the sensed light to the external circuit for fingerprint identification.

Specifically, the second light source is a light source that provides infrared non-visible light, but it is not limited to this.

In the embodiment of the present invention, an upper glass may be arranged between the color filter substrate and the fingerprint sensing layer, and a lower glass may be arranged between the array substrate and the backlight source to further protect the display panel.

The display module provided by the embodiment of the present invention will be further described below. The following display module takes a TFT display module as an example.

In response to the above technical problems, the embodiments of the present invention provide a display module, which can be specifically implemented as a TFT display module. The backlight source of the TFT display module can be changed by the light emitting diode (LED) lamp and the fingerprint sensor. (Sensor) Sensing layer (i.e. the above-mentioned fingerprint sensing layer), which realizes the application of the optical fingerprint module on the TFT display module; specific (the second light source is an infrared light source as an example):

Add some infrared non-visible LED lights to the multiple LED lights in the backlight, and set the fingerprint sensor layer above the upper glass (as shown in Figure 1) to achieve fingerprint recognition. In order to avoid affecting the TFT display, a non-visible LED lamp is added to the backlight. The fingerprint sensor layer can receive infrared non-visible light, so that the light source required by the fingerprint sensor layer is generated without affecting the display of the display screen.

More specifically: the overall structure of the solution provided by the embodiment of the present invention is shown in FIG. 1. The fingerprint sensor layer is placed on the upper glass, and indium tin oxide (Indium Tin Oxide) can be completed in the BD (binding) area of the upper glass. ITO) is bound (i.e. fixed) and connected with other circuits (i.e., the above-mentioned second external circuit).

Among them, some of the LED lights of the backlight source are infrared non-visible light LED lights, which are used for the fingerprint module (that is, the fingerprint sensor layer) to sense and receive the light emitting light source (specifically the light reflected from the outside world), as shown in the figure 2 Infrared non-visible light LED lights, the specific number and location of the lights can be adjusted according to actual needs, which is not limited here.

The fingerprint sensor sensing layer in the embodiment of the present invention mainly realizes the sensing of infrared non-visible light through photosensitive diodes (as shown in FIG. 3); specifically, in order to prevent the photosensitive diodes of the fingerprint sensor sensing layer from blocking the pixel display of the display screen and affecting the display As a result, the position of the photosensitive diode in the embodiment of the present invention needs to avoid the RGB pixels of the color filter (color filter, that is, the above-mentioned color film substrate). As shown in FIG. 4, R, G, and B represent the pixel points of the color filter, and S Represents the photosensitive diode of the fingerprint sensor sensing layer. In the embodiment of the present invention, the color filter at the upper glass BM position can be connected to the external circuit (that is, the above-mentioned first external circuit) after the ITO is bound by ACF (anisotropic conductive film), conductive glue, and the like.

It can be seen from the above that, in the embodiment of the present invention, the point light source emitted by the backlight LED lamp becomes a surface light source after passing through the backlight light guide plate and various film materials. The entire display area of the display screen emits light, and the emitted light reaches after passing through the display screen. The finger is then reflected by the finger and irradiated to the photosensitive diode of the fingerprint sensor sensing layer (as shown in Figure 5). After the photosensitive diode is exposed to light, the resistance value changes to convert the light signal into an electrical signal, and the connection is realized through the BD (binding) area. The connection of the external circuit (that is, the above-mentioned second external circuit) is specifically the transmission of electrical signals to the external circuit through the BD.

To sum up, this solution realizes the application of the optical fingerprint module to the TFT display module, and prevents the light from being blocked by the backlight by placing the fingerprint sensor layer on the upper glass.

It is explained here that the embodiment of the present invention can realize full unlocking of the screen or partial unlocking, and at the same time, the second light source can be placed on other different positions and different devices, and can also meet the needs of different applications for fingerprint recognition; for example, it can be applied to The display screens of various terminal products such as mobile phones, tablet computers (portable android devices, PAD), fingerprint locks, and augmented reality (Augmented Reality, AR) wearable devices, transparent battery covers on the back and transparent parts on the side middle frame, etc. As long as it can be emitted and reflected back to the fingerprint sensor sensing layer through the outside, it is not limited here.

An embodiment of the present invention also provides an electronic device, including: the above-mentioned display module.

The electronic device provided by the embodiment of the present invention can realize each function realized by the display module in the embodiment of FIG. 1 to FIG.

It should be noted that in this article, the terms "include", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, It also includes other elements that are not explicitly listed, or elements inherent to the process, method, article, or device. If there are no more restrictions, the element defined by the sentence "including a..." does not exclude the existence of other identical elements in the process, method, article, or device that includes the element.

The embodiments of the present invention are described above with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only illustrative and not restrictive. Those of ordinary skill in the art are Under the enlightenment of the present invention, many forms can be made without departing from the purpose of the present invention and the scope of protection of the claims, and they all fall within the protection of the present invention.

Claims

A display module includes a backlight source and a display panel, the backlight source includes a first light source for providing visible light and a second light source for providing invisible light;

The display module further includes:

A fingerprint sensing layer disposed on a side of the display panel away from the backlight source, wherein the fingerprint sensing layer is used to receive reflected light reflected by a finger above the display panel;

The reflected light is the reflected light of the invisible light emitted by the second light source toward the display panel.
The display module according to claim 1, wherein the backlight source further comprises a light guide plate, the first light source and the second light source are both arranged on the side surface of the light guide plate, and the side surface is connected to the light guide plate. The light-emitting surfaces are adjacent.
3. The display module according to claim 2, wherein, on one of the side surfaces of the light guide plate, the first light source and the second light source are arranged at intervals.
The display module according to claim 1, wherein the display panel comprises an array substrate, a color filter substrate, and a liquid crystal layer provided between the array substrate and the color filter substrate that are arranged oppositely; the fingerprint sensor The layer is arranged on the side of the color filter substrate away from the liquid crystal layer.
The display module according to claim 4, wherein the fingerprint sensing layer comprises a plurality of photosensitive elements, and the orthographic projection of the plurality of photosensitive elements on the color filter substrate is located on the black matrix of the color filter substrate. BM area.
The display module according to claim 4, further comprising: a glass cover plate, the glass cover plate being arranged on a side of the fingerprint sensing layer away from the color filter substrate.
7. The display module of claim 6, further comprising: a polarizer, the polarizer being disposed between the fingerprint sensing layer and the glass cover.
The display module according to claim 1, further comprising: a binding area, and the fingerprint sensing layer is connected to a second external circuit through the binding area.
The display module according to claim 1, wherein the second light source is a light source that provides infrared non-visible light.
An electronic device, comprising: the display module according to any one of claims 1 to 9.