WO2019080778A1

WO2019080778A1 - Optical detection component and terminal device

Info

Publication number: WO2019080778A1
Application number: PCT/CN2018/111057
Authority: WO
Inventors: 魏文雄; 沈奥; 王帆; 李志勇
Original assignee: 华为技术有限公司
Priority date: 2017-10-23
Filing date: 2018-10-19
Publication date: 2019-05-02
Also published as: CN109696682A

Abstract

Provided are an optical detection component (100) and a terminal device, the optical detection component (100) being located below a display module, and the display module is provided with a transparent panel, a first polarizing plate, a first wave plate and an illuminating layer from top to bottom in sequence. The optical detection component (100) is provided with the following from top to bottom in sequence: a second wave plate (101), a second polarizing plate (102), a light detection layer (103) and a light source layer (104), wherein the polarization direction of the first polarizing plate is perpendicular to that of the second polarizing plate (102), the fast axis of the second wave plate (101) is parallel to that of the first wave plate, and both the first wave plate and the second wave plate (101) are quarter wave plates; alternatively, the polarization direction of the first polarizing plate is parallel to that of the second polarizing plate (102), the fast axis of the second wave plate (101) is perpendicular to that of the first wave plate, and both the first wave plate and the second wave plate (101) are quarter wave plates. When the optical detection component (100) according to the present application is placed below the display module, the reflected light of the illuminating layer may be eliminated, thereby increasing the proportion of effective detecting light in the total light received by the light detection layer (103).

Description

Optical inspection components and terminal equipment

The present application claims priority to Chinese Patent Application No. PCT Application No. No. No. No. No. No. No. No. No. No.

Technical field

The present application relates to the field of optical inspection technology, and more particularly to an optical detection assembly and a terminal device.

Background technique

Fingerprint recognition is an important application and experience function of current mobile phones. Full-screen fingerprint sensing is the development trend of future mobile phone fingerprint sensors. The goal is to complete fingerprint detection in any area of the mobile phone screen.

A method for detecting fingerprints under the screen is known, which mainly includes detection schemes such as ultrasonic detection, capacitance detection and optical detection. The fingerprint detection method under the screen performs fingerprint detection through the optical fingerprint detection module. The optical fingerprint detection module consists of a light source and a detector, and the light source and detector are placed at the bottom of the screen.

Since there are various reflective layers in the screen, a large amount of light is reflected by the reflective layer and received by the detector below the screen, and the reflected light is not reflected in the light emitted from the light source at the bottom of the screen. The information containing the object to be detected (for example, fingerprint information) reduces the proportion of effective detected light in the total light received by the detector, that is, reduces the signal-to-noise ratio of the detected information.

Therefore, it is desirable to provide a method that increases the proportion of effective detected light in the total light received by the detector.

Summary of the invention

The present application provides an optical detecting component and a terminal device capable of supporting the elimination of reflected light of the luminescent layer, thereby increasing the proportion of effective detecting light in the total light received by the light detecting layer.

In a first aspect, an optical detecting component is disposed under the display module, and the display module is configured with a transparent panel, a first polarizing plate, a first wave plate and a light emitting layer from top to bottom. The optical detecting component is configured from the top to the bottom: a second wave plate, a second polarizing plate, a light detecting layer and a light source layer; wherein a polarization direction of the first polarizing plate is perpendicular to a polarization direction of the second polarizing plate, the first The fast axis of the two-wave plate is parallel to the fast axis of the first wave plate, the first wave plate and the second wave plate are both quarter-wave plates, or the polarization direction and the second polarization of the first polarizing plate The polarization directions of the slices are parallel, and the fast axis of the second wave plate is perpendicular to the fast axis of the first wave plate, and the first wave plate and the second wave plate are both quarter wave plates.

By placing the optical detecting component under the display module, and causing the fast axis of the first wave plate in the display module, the polarization direction of the first polarizing plate, and the polarization direction of the second polarizing plate in the optical detecting component, There is a certain correspondence between the fast axes of the second wave plate, so that the light emitted from the light source can be filtered out after reaching the light emitting layer in the display module and being reflected by the light emitting layer, that is, the light reflected by the light emitting layer. The light detecting layer cannot be reached, and the light emitted upward from the light source can reach the light detecting layer after being reflected by the object to be detected on the upper surface of the transparent panel in the display module, and is received by the light detecting layer.

Optionally, the object to be detected involved in the embodiment of the present application may be any one of a fingerprint, a palm print, a face, or other objects.

Optionally, an acute angle formed between a polarization direction of the first polarizer and a fast axis of the first wave plate is 45°, and a polarization direction of the second polarizer and a fast axis of the second wave plate The acute angle formed between them is 45°.

By setting an acute angle formed between a polarization direction of the first polarizer and a fast axis of the first wave plate to be 45°, a polarization direction of the second polarizer and a fast axis of the second wave plate The angle formed by the acute angle is 45°, so that when the polarized light passing through the first polarizing plate passes through the two quarter-wave plates parallel to the two fast axes, the polarization direction of the polarized light is converted into the first polarization. The polarization direction of the polarization direction is vertical, and the polarization direction of the polarized light is converted to and through the second after the polarized light passing through the second polarizer passes through the two quarter-wave plates parallel to the two fast axes. The polarization direction of the polarization direction after the polarizer is perpendicular.

In combination with the first aspect, in some implementations of the first aspect, the optical detecting component further includes a compensating wave plate disposed on an upper surface of the second wave plate, the fast axis and the optical of the compensating wave plate The fast axis of the plastic is vertical, and the optical plastic is disposed on the lower surface of the luminescent layer.

By adding a compensating wave plate to the optical detecting component, the material and thickness of the compensating wave plate are the same as the optical plastic, and the fast axis of the compensating wave plate is perpendicular to the fast axis of the optical plastic, thereby overcoming the optical plastic pair The influence of the polarization state of the light beam enables the polarized light that is reflected by the luminescent layer to reach the second polarizing plate to be completely filtered by the second polarizing plate.

In conjunction with the first aspect, in some implementations of the first aspect, the luminescent layer is an organic light emitting diode OLED layer.

In a second aspect, an optical detecting component is disposed under the display module, and the display module is configured with a transparent panel, a first polarizing plate, a first wave plate and a light emitting layer from top to bottom. The optical detecting component is configured from the top to the bottom: a second wave plate, a second polarizing plate, a light source layer and a light detecting layer; wherein a polarization direction of the first polarizing plate is perpendicular to a polarization direction of the second polarizing plate, the first The fast axis of the two-wave plate is parallel to the fast axis of the first wave plate, the first wave plate and the second wave plate are both quarter-wave plates, or the polarization direction and the second polarization of the first polarizing plate The polarization directions of the slices are parallel, and the fast axis of the second wave plate is perpendicular to the fast axis of the first wave plate, and the first wave plate and the second wave plate are both quarter wave plates.

By placing the optical inspection component below the display module, and causing the fast axis of the first wave plate in the display module, the polarization direction of the first polarizer, and the polarization direction of the second polarizer in the optical detection component There is a certain correspondence between the fast axes of the second wave plate, so that the light emitted from the light source can be filtered out after reaching the light emitting layer in the display module and being reflected by the light emitting layer, that is, after being reflected by the light emitting layer The light cannot reach the light detecting layer, and the light emitted upward from the light source can reach the light detecting layer after being reflected by the object to be detected on the upper surface of the transparent panel in the display module, and is received by the light detecting layer.

In conjunction with the second aspect, in some implementations of the second aspect, the optical detecting component further includes a compensating wave plate disposed on an upper surface of the second wave plate, the fast axis and the optical of the compensating wave plate The fast axis of the plastic is vertical, and the optical plastic is disposed on the lower surface of the luminescent layer.

In conjunction with the second aspect, in some implementations of the second aspect, the optical detecting component further includes: a third polarizing plate disposed between the light source layer and the light detecting layer, the third polarization The polarization direction of the sheet is the same as the polarization direction of the second polarizer.

The third polarizing plate is disposed between the light source layer and the light detecting layer, and the polarization direction of the third polarizing plate is the same as the polarization direction of the second polarizing plate, so that the light emitted from the light source layer passes through the first The three polarizers are attenuated by 50%, and it is ensured that the polarized light that has passed through the second polarizer after being reflected by the object to be detected can be received by the photodetecting layer.

In conjunction with the second aspect, in some implementations of the second aspect, the light emitting layer is an organic light emitting diode OLED layer.

In a third aspect, an optical detecting component is disposed, which is configured with a light source layer, a second polarizing plate, and a light detecting layer from top to bottom. The optical detecting component is located below the display module, and the display module is configured by The transparent panel, the first polarizing plate, the first wave plate and the light emitting layer are arranged in order from top to bottom, wherein the light source layer is a polarization light source layer, and the polarization direction of the polarized light emitted by the light source layer and the second polarizing plate are The polarization direction is vertical.

By placing the optical detecting component under the display module, and causing the light emitted by the light source layer to be polarized light, the polarization direction of the polarized light is perpendicular to the polarization direction of the second polarizing plate, so that the light source layer is emitted upward. The polarization direction of the polarized light reflected by the luminescent layer is perpendicular to the polarization direction of the second polarizing plate, so that the polarized light reflected by the luminescent layer is filtered by the second polarizing plate before reaching the photodetecting layer, and the light source layer is downwardly The emitted polarized light is filtered by the second polarizing plate before reaching the photodetecting layer, and the polarized light emitted from the light source layer is reflected by the object to be detected on the upper surface of the transparent panel to reach the photodetected layer, and is The light detection layer is received.

A fourth aspect of the present invention provides a terminal device, comprising: the optical detection component and the display module in any one of the first aspect and the first aspect, wherein the optical detection component is located in the display module Below.

Optionally, the terminal device may specifically be a smart terminal device including a display screen, for example, the terminal device may be a smart phone, a tablet computer, a wearable device, a personal computer, or the like.

By arranging the optical detecting component in the lower part of the display module in the terminal device, the light reflected by the illuminating layer is completely filtered out before reaching the light detecting layer, and the light emitted upward from the light source reaches the display module. The object to be detected on the upper surface of the transparent panel is reflected by the object to be detected and can reach the light detecting layer and is received by the light detecting layer.

A fifth aspect of the present invention provides a terminal device, comprising: the optical detection component and the display module in any one of the second aspect and the second aspect, wherein the optical detection component is located in the display module Below.

According to a sixth aspect, the invention provides a terminal device, comprising: the optical detection component and the display module in any one of the foregoing third aspect and the third aspect, wherein the optical detection component is located in the display module Below.

DRAWINGS

1 is a schematic view showing the functional principle of a polarizing plate;

2 is a schematic diagram of the functional principle of a 1/2 wave plate;

Figure 3 is a schematic diagram of the functional principle of a quarter wave plate;

4 is a schematic structural diagram of an optical detecting component according to an embodiment of the present application;

FIG. 5 is a schematic diagram of the principle of the anti-reflection light of the optical detecting component according to the embodiment of the present application; FIG.

6 is a schematic diagram of an optical path of an anti-reflection light of an optical detecting component according to an embodiment of the present application;

7 is a schematic diagram of another optical path of the anti-reflection light of the optical detecting component of the embodiment of the present application;

FIG. 8 is a schematic diagram of still another optical path of the anti-reflection light of the optical detecting component according to the embodiment of the present application; FIG.

9 is another schematic diagram of the anti-reflection light of the optical detecting component of the embodiment of the present application;

FIG. 10 is another schematic diagram of the principle of the anti-reflection light of the optical detecting component of the embodiment of the present application; FIG.

11 is a schematic diagram showing still another principle of the anti-reflection light of the optical detecting component according to the embodiment of the present application;

FIG. 12 is a schematic diagram showing the structure of another optical detecting component according to an embodiment of the present application.

Detailed ways

The technical solutions in the present application will be described below with reference to the accompanying drawings.

For a better understanding of the optical detecting component of the embodiment of the present application, the related principles of the polarizing plate and the wave plate in the embodiment of the present application will be briefly described below with reference to FIG. 1 to FIG.

1, polarizer

As an optical device, a polarizing plate can convert natural light into linearly polarized light. Each polarizer has a transmission axis, and the natural light passes through the polarizer and becomes linearly polarized light whose polarization direction is parallel to the direction of the transmission axis.

As shown in FIG. 1, wherein the direction of the arrow indicates the direction of polarization. For linearly polarized light, if its polarization direction is parallel to the transmission axis, it can completely pass through the polarizer; if its polarization direction is perpendicular to the transmission axis, it cannot pass through the polarizer. The direction of the transmission axis of the polarizing plate can be changed by rotating the polarizing plate.

2, wave plate

Wave plates, also known as phase retarders, are fabricated from materials with birefringence to adjust the polarization of light. The wave plate has two mutually perpendicular optical axes. When the light passes through the wave plate, the light transmitted in a certain direction is faster, and the direction is called the fast axis. In the vertical direction corresponding to the direction, the light transmission speed is slower. Called the slow axis.

When the incident light passes through the wave plate, it is decomposed into two beams, one beam is parallel to the fast axis of the wave plate, and one beam is parallel to the slow axis of the wave plate. Since the light transmission speed of the fast and slow axis is different, the two beams are different. When the wave plate passes through, the phase difference will be generated. After the wave plate, the two beams of light will reconstitute a beam of light. However, since the phases of the two beams are different, the beam formed after the wave plate will also appear different. Polarization state. If the phase difference between the two beams is 180°, the wave plate is called a 1/2 wave plate or a half wave plate. As shown in FIG. 2, when the polarization direction of the incident light is at an angle θ with the fast axis of the wave plate, At 45°, the polarization direction of the outgoing light after passing through the 1/2 wave plate is perpendicular to the polarization direction of the incident light, that is, 2θ is 90°.

When the phase difference between the two beams is 90°, the wave plate is called a quarter wave plate, and the light emitted by the 1/4 wave plate becomes circularly polarized light, as shown in FIG. 3, circularly polarized light. There is no polarization direction. If the two quarter-wave plates are parallel to each other, they can form a 1/2-wave plate. It can be seen that the circularly polarized light passes through a quarter-wave plate and turns into linearly polarized light; two quarter-wave plates If the fast axis is vertical, there is no effect on the polarization state of the passing light.

FIG. 4 is a schematic structural diagram of an optical detecting assembly 100 according to an embodiment of the present application. The optical detection assembly 100 includes:

a second wave plate 101, a second polarizing plate 102, a light detecting layer 103 and a light source layer 104;

The second wave plate 101, the second polarizing plate 102, the light detecting layer 103, and the light source layer 104 are sequentially disposed in the optical detecting unit 100 from top to bottom.

The optical detecting component 100 is generally disposed under the display module. As shown in FIG. 5, the display module is provided with a transparent panel, a first polarizing plate, a first wave plate and a light emitting layer in this order from top to bottom.

The polarization direction of the first polarizer is perpendicular to the polarization direction of the second polarizer 102, and the fast axis of the second waveplate 101 is parallel to the fast axis of the first waveplate, the first waveplate and the second The wave plate 101 is a quarter wave plate, or the polarization direction of the first polarizing plate is parallel to the polarization direction of the second polarizing plate 102, and the fast axis of the second wave plate 101 is faster than the first wave plate. The axis is vertical, and the first wave plate and the second wave plate 101 are both quarter wave plates.

It should be noted that the light detecting layer 103 is configured to detect the reflected light reflected by the object to be detected (for example, a fingerprint) on the upper surface of the transparent panel in the display module in the light emitted from the light source layer 104, thereby detecting The reflected light of the fingerprint realizes the identification of the fingerprint information.

By placing the optical detecting component 100 in the embodiment of the present application under the display module, and making the fast axis of the first wave plate in the display module, the polarization direction of the first polarizing plate, and the first in the optical detecting component 100 There is a certain correspondence between the polarization directions of the two polarizing plates 102 and the fast axis of the second wave plate 101, so that the light emitted from the light source layer 104 can be filtered after reaching the light emitting layer in the display module and being reflected by the light emitting layer. In addition, the light reflected by the light-emitting layer cannot reach the light detecting layer 103, and the light emitted from the light source layer 104 can reach the object to be detected on the upper surface of the transparent panel in the display module and can be reflected by the object to be detected. The light detecting layer 103 is reached and received by the light detecting layer 103.

The technical solution for eliminating the reflected light of the luminescent layer in the embodiment of the present application will be described below with reference to the optical detecting component 100 shown in FIG. 4 and FIG.

Optionally, an acute angle formed between a polarization direction of the first polarizer and a fast axis of the first wave plate is 45°, and a polarization direction of the second polarizer and a fast axis of the second wave plate The acute angle formed is 45°

Option One

The acute angle formed between the polarization direction of the first polarizer and the fast axis of the first wave plate is 45°, and the polarization direction of the second polarizer 102 is between the polarization axis of the second wave plate 101 and the fast axis of the second wave plate 101. Forming an acute angle of 45°, the polarization direction of the first polarizer is perpendicular to the polarization direction of the second polarizer 102, and the fast axis of the second waveplate 101 is parallel to the fast axis of the first waveplate, the first The wave plate and the second wave plate 101 are both quarter wave plates.

Specifically, the light emitted from the light source layer 104 passes through the second polarizing plate 102 and the second wave plate 101 in turn and first reaches the light emitting layer of the display module. Among all the light reaching the light emitting layer, a part of the light passes through the light emitting layer. The upward propagation continues, and the upward wave propagates through the first wave plate, the first polarizing plate, and the transparent panel in the display module to reach the object to be detected on the upper surface of the transparent panel.

After the light emitted from the light source layer 104 passes through the second polarizing plate 102, the corresponding incident light is converted into polarized light having the same polarization direction as the polarization direction of the second polarizing plate 102, and the polarized light passes through the second wave plate 101. After that, it is converted into circularly polarized light. Since the angle between the polarization direction of the second polarizing plate 102 and the fast axis of the second wave plate 101 is 45°, the circularly polarized light reaches the luminescent layer and is After the light-emitting layer is reflected again, after passing through the second wave plate 101, it is converted into polarized light having a polarization direction perpendicular to the polarization direction of the second polarizing plate 102. Therefore, the light reflected by the light-emitting layer cannot pass through the second wave plate 101. It passes through the second polarizing plate 102, that is, cannot be received by the light detecting layer 103. The light path of the light emitted from the light source layer 104 from the second polarizing plate 102 to the light emitting layer is as shown in FIG. 6.

For the light that is emitted upward from the light source layer 104 and continues to propagate upward through the light emitting layer, the portion of the light will be converted into circularly polarized light after passing through the second wave plate 101, due to the polarization direction of the second polarizing plate 102. The acute angle formed between the fast axes of the two wave plates is 45°, and the fast axis of the first wave plate is parallel to the fast axis of the second wave plate 101. Therefore, the circularly polarized light continues to propagate upward, after passing through the After a wave plate, it is converted into polarized light whose polarization direction is perpendicular to the polarization direction of the second polarizing plate 102. Since the polarization direction of the first polarizing plate and the second polarizing plate 102 is perpendicular, the first wave plate is passed after the first wave plate. Partially polarized light can pass through the first polarizing plate to reach the object to be detected on the upper surface of the transparent panel and be reflected by the object to be detected, and the polarized light reflected by the object to be detected sequentially passes through the first polarizing plate and the first wave parallel to the fast axis. After the sheet and the second wave plate 101, the polarized light having a polarization direction parallel to the polarization direction of the second polarizing plate 102 is converted, and the polarized light can completely pass through the second polarizing plate 102 to the light detecting layer, and is received by the light detecting layer. . The light path of the light emitted from the light source layer 104 from the second polarizing plate 102 to the transparent panel is as shown in FIG.

Option II

The acute angle formed between the polarization direction of the first polarizer and the fast axis of the first wave plate is 45°, and the polarization direction of the second polarizer 102 is between the polarization axis of the second wave plate 101 and the fast axis of the second wave plate 101. Forming an acute angle of 45°, the polarization direction of the first polarizer is parallel to the polarization direction of the second polarizer 102, and the fast axis of the second waveplate 101 is perpendicular to the fast axis of the first waveplate, the first The wave plate and the second wave plate 101 are both quarter wave plates.

After the light emitted from the light source layer 104 passes through the second polarizing plate 102, the corresponding incident light is converted into polarized light having the same polarization direction as the polarization direction of the second polarizing plate 102, and the polarized light passes through the second wave plate 101. After that, it will be converted into circularly polarized light. Since the angle between the polarization direction of the second polarizing plate 102 and the fast axis of the second wave plate is 45°, the circularly polarized light reaches the luminescent layer and is illuminated. After the layer is reflected again, after passing through the second wave plate 101, it is converted into polarized light having a polarization direction perpendicular to the polarization direction of the second polarizing plate 102. Therefore, the light reflected by the light-emitting layer cannot pass after passing through the second wave plate 101. The second polarizing plate 102, that is, cannot be received by the light detecting layer 103. The light path of the light emitted from the light source layer 104 from the second polarizing plate 102 to the light emitting layer is as shown in FIG. 6.

For the light that is emitted upward from the light source layer 104 and continues to propagate upward through the light emitting layer, the portion of the light will be converted into circularly polarized light after passing through the second wave plate 101, due to the polarization direction of the second polarizing plate 102. The acute angle formed between the fast axes of the two wave plates is 45°, and the fast axis of the first wave plate is perpendicular to the fast axis of the second wave plate 101. Therefore, the circularly polarized light continues to propagate upward, after passing through the After a wave plate, it is converted into polarized light, and the polarization direction of the polarized light is the same as the polarization direction of the second polarizing plate 102. Since the polarization direction of the second polarizing plate 102 is parallel to the polarization direction of the first polarizing plate, the The polarized light can pass through the first polarizing plate to reach the object to be detected on the upper surface of the transparent panel and be reflected by the object to be detected, and the polarized light reflected by the object to be detected passes through the first polarizing plate and the first wave plate perpendicular to the fast axis. After the second wave plate 101, since the first wave plate is perpendicular to the fast axis of the second wave plate 101, the polarized light that is reflected by the object to be detected and passes through the first polarizing plate passes through the first wave plate perpendicular to the fast axis and After the second wave plate 101 The polarization direction of the first polarizer is not changed. Since the polarization direction of the first polarizer is parallel to the polarization direction of the second polarizer 102, the polarized light reflected by the object to be detected sequentially passes through the first polarizer and the fast axis is vertical. After the first wave plate and the second wave plate 101, the first wave plate 101 can be completely passed through the first polarizing plate 101 and received by the light detecting layer 103. The light path of the light emitted from the light source layer 104 between the second polarizing plate 102 and the transparent panel is as shown in FIG.

It should be noted that the angle between the polarization direction of the first polarizer and the fast axis of the first wave plate is 45°, and the polarization direction of the second polarizer 102 and the second wave. The method for eliminating the reflected light of the illuminating layer in the embodiment of the present application is described by using the example of the embodiment of the present application. For example, the first embodiment is not limited thereto. The acute angle formed between the polarization direction of the polarizing plate and the fast axis of the first wave plate may also be 30°, and the polarization direction of the second polarizing plate 102 and the fast axis of the second wave plate 101 are The acute angle formed can also be 30°.

Optionally, the optical detecting component 100 further includes a compensation wave plate 105 disposed on an upper surface of the second wave plate 101, and the compensation wave plate 105 is configured on the basis of the foregoing first and second embodiments. The fast axis is perpendicular to the fast axis of the optical plastic, and the optical plastic is disposed on the lower surface of the light emitting layer.

Optionally, the luminescent layer is an organic light-emitting diode (OLED) layer.

Specifically, for a flexible light-emitting layer (eg, an organic light-emitting diode OLED layer), in order to protect the OLED layer, a layer of optical plastic is usually added to the lower surface of the OLED layer, as shown in FIG.

The optical plastic has the characteristic of birefringence, and the specific principle is the same as that of the wave plate. Therefore, the optical plastic added on the lower surface of the OLED layer interferes with the polarization direction of the incident light, and therefore, the light beam reflected by the luminescent layer may not be caused. It is completely eliminated by the second polarizing plate 102.

In order to overcome the interference of the optical plastic on the polarization direction of the incident light, the optical detecting component 100 further includes a compensating wave plate 105 disposed on the upper surface of the second wave plate 101, and the compensating wave plate 105 is fast. The axis is perpendicular to the fast axis of the optical plastic, that is, the compensating wave plate 105 and the optical plastic are equivalent to two wave plates parallel to the fast axis, and therefore, the polarization direction of the polarized light passing through the compensating wave plate 105 and the optical plastic does not Any influence is generated such that the polarization direction of the polarized light reaching the second polarizing plate 102 after being reflected by the luminescent layer is completely perpendicular to the polarization direction of the second polarizing plate 102, and further causes the second polarizing plate 102 to be reflected by the luminescent layer. The polarized light can be completely filtered by the second polarizing plate 102.

Wherein, the compensation wave plate 105 has the same material and thickness as the optical plastic.

By adding the compensation wave plate 105 in the optical detecting assembly 100, the material and thickness of the compensating wave plate 105 are the same as that of the optical plastic, and the fast axis of the compensating wave plate 105 is perpendicular to the fast axis of the optical plastic, thereby overcoming The effect of the optical plastic on the polarization state of the light allows the polarized light that is reflected by the luminescent layer to reach the second polarizing plate 102 to be completely filtered by the second polarizing plate 102.

It should be noted that, in the schematic diagram of the anti-reflection light of the optical detecting component shown in FIG. 5 and FIG. 9 of the embodiment of the present application, in order to more intuitively display the optical path of the light emitted upward from the light source layer 104, 5 and FIG. 10, the distance between the light detecting layer 103 and the second polarizing plate 102 is enlarged, but this does not constitute any limitation to the embodiment of the present application. In the actual product, the light detecting layer 103 and the second polarizing film 102 There may be a perfect fit between the light detecting layer 103 and the second polarizing film 102.

The principle of eliminating the reflected light of the illuminating layer in the embodiment of the present application is described by taking the optical detecting component 100 shown in FIG. 4 as an example. However, the embodiment of the present application is not limited thereto.

Optionally, the light source layer 104 may also be located on the upper surface of the light detecting layer 103. As shown in FIG. 10, the optical detecting component 100 is sequentially disposed from top to bottom: a second wave plate 101, a second polarizing plate 102, and a light source. Layer 104 and light detecting layer 103.

The optical detecting component 100 is usually disposed under the display module. As shown in FIG. 10, the display module is provided with a transparent panel, a first polarizing plate, a first wave plate and a light emitting layer in this order from top to bottom.

When the light source layer 104 is located on the upper surface of the light detecting layer 103, the fast axis of the first wave plate in the display module, the polarization direction of the first polarizing plate, and the polarization direction of the second polarizing plate 102 in the optical detecting component 100, The correspondence between the fast axes of the second wave plate 101 is the same as that described in the first scheme and the second embodiment. The technical solution for specifically eliminating the reflected light of the light emitting layer is the same as that described in the first scheme and the second scheme. I won't go into details here.

It should be noted that when the light source layer 104 is located on the lower surface of the light detecting layer 103, when the position of the detecting unit and the wiring is arranged on the light detecting layer 103, the opening is left to allow the light emitted by the light source layer 104 to pass through; When the light source layer 104 is located on the upper surface of the light detecting layer 103, a portion where the light source layer 104 is required to be positioned above the light detecting layer 103 at this time is made of a light transmitting material.

Optionally, on the basis of the optical detecting component 100 shown in FIG. 10, the optical detecting component 100 further includes: a third polarizing plate 106, the third polarizing plate 106 is disposed on the light source layer 104 and the light detecting layer 103. The polarization direction of the third polarizer 106 is the same as the polarization direction of the second polarizer 102.

Specifically, when the light source layer 104 is located on the upper surface of the light detecting layer 103, the light emitted from the light source layer 104 may reach the light detecting layer 103 and be received by the light detecting layer 103. However, the light source layer 104 is emitted downward. The light is an ineffective detection light for the detection layer 104, which reduces the proportion of effective detection light in the total light received by the light detection layer 104.

Therefore, on the basis of the optical detecting component 100 shown in FIG. 10, the optical detecting component 100 further includes a third polarizing plate 106 disposed between the light source layer 104 and the light detecting layer 103. As shown in FIG. 11, the light emitted from the light source layer 104 is attenuated by 50% after passing through the third polarizing plate 106, and the polarized light passing through the second polarizing plate 102 can be reflected by the light detecting layer after being reflected by the object to be detected. Receiving 104, the polarization direction of the third polarizer 106 is the same as the polarization direction of the second polarizer 102.

By arranging the third polarizing plate 106 between the light source layer 104 and the light detecting layer 103 such that the polarization direction of the third polarizing plate 106 is the same as the polarization direction of the second polarizing plate 102, the light source layer 104 is emitted downward. The light rays are attenuated by 50% after passing through the third polarizing plate 106, and it is ensured that the polarized light that has passed through the second polarizing plate 102 after being reflected by the object to be detected can be received by the light detecting layer 104.

It should be noted that, in the schematic diagram of the anti-reflection light of the optical detecting component shown in FIG. 10 and FIG. 11 of the embodiment of the present application, when the luminescent layer is an OLED layer, a layer may be added to the lower surface of the OLED layer. Optical plastic, and a compensating wave plate is disposed on the upper surface of the second wave plate 101 to overcome the interference of the optical plastic on the polarization direction of the incident light. For a detailed description, please refer to the related description in FIG. 9 above, for the sake of brevity. I won't go into details here.

It should be noted that, in the schematic diagram of the anti-reflection light of the optical detecting component shown in FIG. 10 and FIG. 11 of the embodiment of the present application, in order to more intuitively display the optical path of the light emitted from the light source layer 104, The distance between the light source layer 104 and the second polarizing plate 102 is enlarged in FIG. 10 and FIG. 11, but this does not constitute any limitation to the embodiment of the present application. In the actual product, the light source layer 104 and the second polarizing plate 102 There may be no fit between the light source layer 104 and the second polarizer 102.

It should be noted that, in the schematic diagram of the anti-reflection light of the optical detecting component shown in FIG. 5, FIG. 9, FIG. 10 and FIG. 11 of the embodiment of the present application, the object to be detected is not shown, in actual detection, The object to be detected is located on the upper surface of the transparent panel in the display module.

Optionally, the object to be detected in the embodiment of the present application may be any one of a fingerprint, a palm print, a face, or other objects, which is not specifically limited in the embodiment of the present application.

Optionally, the light source layer 104 involved in the embodiment of the present application may be a single laser, an array laser, a light-emitting diode (LED), or a surface light source composed of a light source and a light guide plate. The application does not specifically limit this.

Optionally, the light detecting layer 103 involved in the embodiment of the present application may be a single photodetector, a detector array, a complementary metal oxide semiconductor (CMOS) image sensor, or a charge coupled device (Charge-coupled). The device, CCD) image sensor is not particularly limited in this application.

In the embodiment of the present application, an optical detecting component 200 is further provided. The optical detecting component 200 is configured with a light source layer 201, a second polarizing plate 202, and a light detecting layer 203 in this order from top to bottom.

The optical detecting component 200 is generally disposed under the display module. As shown in FIG. 12, the display module is provided with a transparent panel, a first polarizing plate, a first wave plate and a light emitting layer in this order from top to bottom.

The light source layer 201 is a polarization light source layer, and the polarization direction of the polarized light emitted by the light source layer 201 is perpendicular to the polarization direction of the second polarizer 202.

By placing the optical detecting component 200 under the display module, and causing the light emitted by the light source layer 201 to be polarized light, the polarization direction of the polarized light is perpendicular to the polarization direction of the second polarizing plate 202, thereby causing the light source layer 201 The polarization direction of the polarized light reflected by the emitted light layer is perpendicular to the polarization direction of the second polarizing plate 202, so that the polarized light reflected by the light emitting layer is filtered by the second polarizing plate 202 before reaching the light detecting layer 203. And causing the polarized light emitted downward from the light source layer 201 to be filtered by the second polarizing plate 202 before reaching the light detecting layer 203, and causing the polarized light emitted from the light source layer 201 to be detected by the upper surface of the transparent panel After being reflected, it can reach the light detecting layer and be received by the light detecting layer.

It should be noted that the light detecting layer 203 is configured to detect the reflected light reflected by the object to be detected (for example, a fingerprint) on the upper surface of the transparent panel in the display module in the polarized light emitted from the light source layer 201, thereby detecting The reflected light of the fingerprint is obtained to realize the identification of the fingerprint information.

It should be noted that, in the embodiment of the present application, the first wave plate and the second wave plate may respectively be a quarter wave plate composed of a plurality of wave plates, or may be a separate piece. The quarter-wave plate is not particularly limited in this embodiment of the present application.

The present application further includes a terminal device including the display module and the optical detecting component 100 or the optical detecting component 200 in any of the above embodiments, wherein the optical detecting component 100 or the optical detecting component 200 is located in the display module Below. The terminal device may specifically be a smart terminal device including a display screen (for example, a transparent panel in the embodiment of the present application). For example, the terminal device may be a smart phone, a tablet computer, a wearable device, a personal computer, or the like.

The optical detecting component 100 or the optical detecting component 200 in the embodiment of the present application is configured in the lower part of the display module in the terminal device, so that the light reflected by the light emitting layer is completely filtered before reaching the light detecting layer 103 or the light detecting layer 203. In addition, the light emitted from the light source layer 104 or the light source layer 201 can reach the light detecting layer 103 or the light detecting layer 203 after reaching the object to be detected on the upper surface of the transparent panel in the display module and being reflected by the object to be detected. It is received by the light detecting layer 103 or the light detecting layer 203.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

The functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, the technical solution of the present application, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

The foregoing is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application. It should be covered by the scope of protection of this application. Therefore, the scope of protection of the present application should be determined by the scope of the claims.

Claims

An optical detecting component is disposed under the display module, and the display module is configured with a transparent panel, a first polarizing plate, a first wave plate and a light emitting layer from top to bottom, wherein The optical detecting component is configured from top to bottom in sequence:

a second wave plate, a second polarizing plate, a light detecting layer and a light source layer;

Wherein the polarization direction of the first polarizer is perpendicular to the polarization direction of the second polarizer, and the fast axis of the second waveplate is parallel to the fast axis of the first waveplate, the first waveplate and the The second wave plate is a quarter wave plate, or

The polarization direction of the first polarizer is parallel to the polarization direction of the second polarizer, and the fast axis of the second waveplate is perpendicular to the fast axis of the first waveplate, the first waveplate and the first The two wave plates are all quarter wave plates.
The optical detecting assembly according to claim 1, wherein an acute angle formed between a polarization direction of the first polarizing plate and a fast axis of the first wave plate is 45°, the second The acute angle formed between the polarization direction of the polarizer and the fast axis of the second wave plate is 45°.
The optical detecting assembly according to claim 1 or 2, wherein the optical detecting component further comprises a compensating wave plate, wherein the compensating wave plate is disposed on an upper surface of the second wave plate, the compensating wave plate The fast axis is perpendicular to the fast axis of the optical plastic, and the optical plastic is disposed on the lower surface of the light emitting layer.
The optical detecting assembly according to any one of claims 1 to 3, wherein the light emitting layer is an organic light emitting diode OLED layer.
An optical detecting component is disposed under the display module, and the display module is configured with a transparent panel, a first polarizing plate, a first wave plate and a light emitting layer from top to bottom, wherein The optical detecting component is configured from top to bottom in sequence:

a second wave plate, a second polarizing plate, a light source layer and a light detecting layer;

Wherein the polarization direction of the first polarizer is perpendicular to the polarization direction of the second polarizer, and the fast axis of the second waveplate is parallel to the fast axis of the first waveplate, the first waveplate and the The second wave plate is a quarter wave plate, or

The polarization direction of the first polarizer is parallel to the polarization direction of the second polarizer, and the fast axis of the second waveplate is perpendicular to the fast axis of the first waveplate, the first waveplate and the first The two wave plates are all quarter wave plates.
The optical detecting assembly according to claim 5, wherein an acute angle formed between a polarization direction of the first polarizing plate and a fast axis of the first wave plate is 45°, the second The acute angle formed between the polarization direction of the polarizer and the fast axis of the second wave plate is 45°.
The optical detecting assembly according to claim 5 or 6, wherein the optical detecting component further comprises a compensating wave plate, wherein the compensating wave plate is disposed on an upper surface of the second wave plate, the compensating wave plate The fast axis is perpendicular to the fast axis of the optical plastic, and the optical plastic is disposed on the lower surface of the light emitting layer.
The optical detecting assembly according to any one of claims 5 to 7, wherein the optical detecting component further comprises:

a third polarizing plate disposed between the light source layer and the light detecting layer, wherein a polarization direction of the third polarizer is the same as a polarization direction of the second polarizer.
The optical detecting assembly according to any one of claims 5 to 8, wherein the light emitting layer is an organic light emitting diode OLED layer.
A terminal device, comprising the optical detecting component and the display module according to any one of claims 1 to 9, wherein the optical detecting component is located below the display module.