WO2020177150A1

WO2020177150A1 - Fingerprint input device and display device

Info

Publication number: WO2020177150A1
Application number: PCT/CN2019/078110
Authority: WO
Inventors: 卓恩宗; 刘振
Original assignee: 惠科股份有限公司
Priority date: 2019-03-01
Filing date: 2019-03-14
Publication date: 2020-09-10
Also published as: CN109886235A

Abstract

The present application relates to a fingerprint input device and a display device. The fingerprint input device comprises a light-emitting layer; a collimation layer disposed on the non-light-source side of the light-emitting layer, said collimation layer being configured to direct the light reflected by the fingerprint to an image sensor at a pre-set angle; and the image sensor disposed on the collimation layer on the side away from the light-emitting layer, said image sensor being configured to sense the light reflected by the fingerprint and to generate, according to the light reflected, image information corresponding to the fingerprint.

Description

Fingerprint input device and display device

This application claims the priority of the Chinese patent application filed with the Chinese Patent Office on 2019-03-01, the application number is 2019101547225, and the application name is "fingerprint input device", the entire content of which is incorporated into this application by reference.

Technical field

This application relates to a fingerprint input device and a display device.

Background technique

The statements here only provide background information related to this application, and do not necessarily constitute prior art.

Biometric fingerprint technology continues to develop in a highly secure network society. Due to mature technology, fingerprint recognition has been widely used in security, immigration and even financial authentication applications. The mainstream of fingerprint sensing methods are capacitive and optical. Capacitive sensing technology uses capacitance difference to distinguish the ridges and valleys of the fingerprint. However, due to the sensing principle, crosstalk seriously interferes with the signal and causes poor image quality. Optical-type sensing technologies generally provide better image quality, however, some applications of them are limited due to the huge volume of prisms and optical elements.

Therefore, the exemplary fingerprint input device has a problem that crosstalk seriously interferes with the signal and causes poor image quality.

Summary of the invention

According to various embodiments disclosed in the present application, a fingerprint input device and a display device are provided.

A fingerprint input device, including:

Luminescent layer

A collimation layer disposed on the non-light source side of the light-emitting layer, the collimation layer being configured to incident light reflected by the fingerprint onto the image sensor at a preset angle; and

An image sensor arranged on the side of the collimating layer facing away from the light emitting layer, the image sensor being arranged to sense light reflected by the fingerprint, and generate image information corresponding to the fingerprint according to the reflected light.

In one of the embodiments, the fingerprint input device further includes an encapsulation layer disposed on the light-emitting layer.

In one of the embodiments, the fingerprint input device further includes a transparent cover plate arranged on the packaging layer, and the transparent cover plate has a fingerprint contact surface.

In one of the embodiments, the light-emitting layer includes:

A drive backplane provided on the collimation layer; and

A light-emitting unit arranged on the drive backplane.

In one of the embodiments, the driving backplane includes a light-transmitting area and a non-light-transmitting area; the light reflected by the fingerprint is incident on the collimating layer through the light-transmitting area.

In one of the embodiments, the driving backplane includes a substrate and a pixel array arranged on the substrate, and a color filter is attached to the pixel array.

In one of the embodiments, the color filter includes color resists corresponding to red, green, blue, and white, respectively.

In one of the embodiments, the light-emitting unit includes a first electrode and a second electrode that are oppositely disposed, and an organic light-emitting layer disposed between the first electrode and the second electrode.

In one of the embodiments, the light emitting unit includes an anode, a hole injection layer, a first hole transport layer, a blue light emitting layer, a first electron transport layer, a first electron injection layer, an intermediate connector, and a Two hole transport layer, red light and green light emitting layer, second electron transport layer, second electron injection layer and cathode.

In one of the embodiments, the collimation layer includes a collimator, the collimator has an array of openings, and the array of openings is configured to perpendicularly incident light reflected by the fingerprint onto the image sensor.

In one of the embodiments, the shape of the openings in the opening array includes a cylindrical shape or a conical shape.

In one of the embodiments, the sidewalls of the openings in the opening array are provided with grooves.

In one of the embodiments, the collimation layer includes an optical fiber plate composed of fiber bundles composed of a plurality of optical fibers, the plurality of optical fibers are spaced apart and arranged in parallel, and the optical fiber axis of the optical fiber is formed by the normal line of the finger contact surface. At a predetermined inclination angle, the optical fiber is arranged to incident the light reflected by the fingerprint onto the image sensor along the inclination angle direction.

In one of the embodiments, the thickness of the collimating layer 120 may be 20 μm-2000 μm.

In one of the embodiments, the image sensor includes a phototransistor sensor array and a sensor pixel array.

In one of the embodiments, the phototransistor sensor array includes a-Si TFT phototransistor sensors, and the sensor pixel array includes a-Si TFT pixels.

A fingerprint input device, including:

Luminescent layer

An image sensor arranged on the side of the collimating layer away from the light-emitting layer, the image sensor being arranged to sense light reflected by the fingerprint, and generate image information corresponding to the fingerprint according to the reflected light;

Wherein, the light-emitting layer includes a driving backplane disposed on the collimation layer and a light-emitting unit disposed on the driving backplane; the driving backplane includes a light-transmitting area and a non-light-transmitting area, fingerprint-reflective Light enters the collimating layer through the light-transmitting area;

The collimation layer includes a collimator, the collimator has an array of openings, and the array of openings is configured to perpendicularly incident the light reflected by the fingerprint onto the image sensor; or the collimation layer includes a plurality of optical fibers. An optical fiber board composed of a fiber bundle, a plurality of the optical fibers are spaced apart and arranged in parallel, the optical fiber axis of the optical fiber and the normal of the finger contact surface form a predetermined inclination angle, and the optical fiber is set to reflect the fingerprint light along the inclination direction Incident on the image sensor;

The image sensor includes a phototransistor sensor array and a sensor pixel array, the phototransistor sensor array includes a-Si TFT phototransistor sensor, and the sensor pixel array includes a-Si TFT pixels.

A display device includes the fingerprint input device as described above.

The details of one or more embodiments of the application are set forth in the following drawings and description. Other features and advantages of this application will become apparent from the description, drawings and claims.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

FIG. 1 is a schematic diagram of a fingerprint input device according to an embodiment;

FIG. 2 is a schematic diagram of the structure of a light-emitting layer of the fingerprint input device corresponding to FIG. 1;

FIG. 3 is a schematic structural diagram of a driving backplane corresponding to the light-emitting layer of FIG. 2;

4 is a schematic diagram of the structure of a light-emitting unit corresponding to the light-emitting layer of FIG. 2;

5 is a schematic structural diagram of another light-emitting unit corresponding to the light-emitting layer of FIG. 2;

FIG. 6 is a schematic structural diagram of the fingerprint input device corresponding to FIG. 1;

FIG. 7 is a schematic diagram of a partial structure of the fingerprint input device corresponding to FIG. 1;

FIG. 8 is a schematic structural diagram of a fingerprint input device according to another embodiment.

detailed description

In order to make the technical solutions and advantages of the present application clearer, the following further describes the present application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the application, and not used to limit the application.

Refer to Fig. 1, which is a schematic diagram of the structure of the fingerprint input device in this embodiment.

In this embodiment, the fingerprint input device 10 includes a light-emitting layer 110, a collimating layer 120 disposed on the non-light source side of the light-emitting layer 10, and an image sensor 130 disposed on the side of the collimating layer 120 away from the light-emitting layer 110.

In this embodiment, the light emitting layer 110 is arranged to emit light having one or more colors on the light emitting side. Specifically, the light emitted from the light-emitting layer 110 is incident on the sensing surface of the fingerprint contact area, the incident light is reflected by the fingerprint, and the reflected light is incident on the image sensor 130 at a preset angle through the collimating layer 120. Wherein, the light includes, but is not limited to, one or more of near-ultraviolet light, violet light, blue light, green light, yellow light, red light, near-infrared light, or white light, depending on the actual setting of the light-emitting layer 110 , The color of the light may also be different. The light emitting layer 110 may have a single layer structure or a combination of multiple layers, for example, a display panel.

In one embodiment, referring to FIG. 2, the light emitting layer 110 may include a driving backplane 111 disposed on the collimation layer 120 and a light emitting unit 112 disposed on the driving backplane.

Wherein, the driving backplane 111 includes a light-transmitting area and a non-light-transmitting area, and the light-transmitting area and the non-light-transmitting area appear alternately. The width of each light-transmitting area may be equal or unequal; the width of each non-light-transmitting area may also be equal or unequal. The light reflected by the fingerprint can be incident on the collimating layer through the light-transmitting area. 3, in one embodiment, the driving backplane 111 includes a substrate 111a and a pixel array 111b disposed on the substrate 111a. The pixel array 111b is disposed in a non-transmissive area of the driving backplane 111, and the pixel array 111b is attached with The color filter 111c, the color filter 111c includes color resists corresponding to red (R), green (G), blue (B), and white (W), respectively, which are driven to emit light through the pixel array 111b and the color filter 111c Full colorization of unit 112. The pixel array 111b is a TFT (Thin Film Transistor) pixel array.

The light-emitting unit 112 may be an OLED (Organic Light-Emitting Diode) device, a QLED (Quantum Dot Light Emitting Diodes, quantum dot light-emitting diode) device, or a TFT-LCD (Thin film transistor-liquid crystal display) device. Liquid crystal display) One of the liquid crystal display devices. Specifically, the light-emitting unit 112 may also be an AMOLED (Active-matrix organic light emitting diode, active matrix organic light emitting diode) device. Take an OLED device as an example. 4, the light emitting unit 112 includes a first electrode 112a and a second electrode 112b disposed oppositely, and one or more organic light emitting layers 112c disposed between the first electrode 112a and the second electrode 112b (Fig. 4 shows an organic The light-emitting layer is an example). The first electrode 112a is an anode, the second electrode 112b is a cathode, and the light-emitting unit 112 is a top-emitting device. The organic light-emitting layer 112c may include one or both of a red-green light-emitting layer and a blue light-emitting layer. It should be noted that in order to enhance the luminous efficiency of the light-emitting unit 112, the light-emitting unit 112 may also add corresponding functional layers. For example, referring to FIG. 5, the light-emitting unit 112 may include an anode 1121, a hole injection layer 1122, and a second A hole transport layer 1123, a blue light emitting layer 1124, a first electron transport layer 1125, a first electron injection layer 1126, an intermediate connector 1127, a second hole transport layer 1128, a red and green light emitting layer 1129, and a second electron The transport layer 1130, the second electron injection layer 1131, and the cathode 1132.

In this embodiment, the collimating layer 120 is disposed on the non-light source side of the light-emitting layer 110, and receives light reflected by the fingerprint passing through the light-transmitting area of the driving back plate 111. When the light emitted from the light-emitting layer 110 is reflected on the fingerprint contact surface, the collimating layer 120 incident the light reflected by the fingerprint onto the pixel array of the image sensor 130 at a preset angle, thereby reducing crosstalk between pixels and improving the direction of light. This feature enables the image sensor 130 to detect and generate high-quality image information corresponding to fingerprints. Among them, the size of the preset angle is set according to the actual pixel array position. The alignment layer 120 may have a single-layer structure or a multilayer structure. In an embodiment, the thickness of the collimating layer 120 may be 20 μm-2000 μm, thereby ensuring that it can perform a corresponding light collimation function while avoiding the thickness of the entire fingerprint input device from being too large.

In one embodiment, referring to FIG. 6, the collimating layer 120 includes a collimator, the collimator has an array of openings, and the array of openings is arranged to cut off the light reflected by the fingerprint at a high incident angle, so that the light reflected by the fingerprint is vertical It is incident on the image sensor. It should be noted that, according to actual conditions, within an acceptable error range, the light reflected by the fingerprint can also be incident close to 90°, and does not need to be strictly equal to 90°. Specifically, the light reflected by the fingerprint is focused on the sensing element at 90 degrees or close to 90 degrees, so that the collimating layer can achieve a light collimation effect and reduce crosstalk between pixels. Wherein, the shape of the opening includes but is not limited to cylindrical or conical, and the side wall of the opening may be provided with grooves or other structures to further ensure the light collimation. The inside of the opening can be air, vacuum or a light-transmitting medium, and it is only necessary to ensure that the light reflected by the fingerprint is focused on the image sensor 130 at 90 degrees or close to 90 degrees. In the opening array, the number of openings is set according to actual needs. Under the condition that each sensing element indicates a corresponding opening, the greater the distance between adjacent openings, the less the number of openings , The lower the utilization rate of light, therefore, under certain circumstances, the distance between the openings can be minimized.

In another embodiment, the collimation layer 120 may also be an optical fiber board including an optical fiber bundle composed of multiple optical fibers. Among them, the optical fibers are spaced apart and arranged in parallel, and the optical fiber axis of each optical fiber is inclined toward the base line of the finger, and forms a predetermined inclination angle with the normal of the finger contact surface. The size of the inclination angle is set according to the position of the sensing element. The light emitted by the fingerprint ensures that the reflected light will be incident on the image sensor 130 along the inclination direction through each optical fiber. In a specific embodiment, the inclination angle may be 90°.

In this embodiment, the image sensor 130 is configured to sense light reflected by the fingerprint, and generate image information corresponding to the fingerprint according to the reflected light. Specifically, the light emitted by the light-emitting layer 110 is used as a light source. When the light source hits the fingerprint wave peak, a strong reflected light will be formed; if it hits a fingerprint wave trough, a weak reflected light will be formed. The image sensor 130 uses the read signal strength to reconstruct the shape of the fingerprint.

In one embodiment, the image sensor 130 includes a phototransistor sensor array 131 and a sensor pixel array 132. The sensor pixel array 132 senses light reflected by the fingerprint, and the phototransistor sensor array 131 generates image information corresponding to the fingerprint according to the reflected light. .

The size of each pixel in the sensor pixel array 132 can be selected and set according to actual product requirements. Multiple sensor pixels can be arranged in a matrix. The sensor pixel array 132 can be arranged on the phototransistor sensor array 131 (as shown in FIG. 7), and the arrangement of each pixel corresponds specifically to the projection position of the light-transmitting portion of the driving backplane 131, so as to pass through the collimating layer 120 ( Taking the collimator as an example) receives the reflected light. The sensor pixel array 132 may also be arranged on the substrate in parallel with the phototransistor sensor array 131. In one embodiment, the phototransistor sensor array 131 includes a-Si TFT phototransistor sensors, and the sensor pixel array 132 includes a-Si TFT pixels. The image sensor 130 has high optical utilization, thereby improving the quality of light information transmission. In another embodiment, the phototransistor sensor array 131 includes a-Si:H TFT phototransistor sensors, and the sensor pixel array 132 includes a-Si:H TFT pixels. The image sensor 130 has higher optical utilization, thereby improving light The quality of information delivery.

The fingerprint input device provided in this embodiment includes a light-emitting layer 110, a collimation layer 120 disposed on the non-light source side of the light-emitting layer 110, and an image sensor 130 disposed on the side of the collimating layer 120 away from the light-emitting layer 110. The light-emitting layer 110 The emitted light is reflected back by the fingerprint, and the reflected light is incident on the pixel array of the image sensor 130 at a preset angle through the collimating layer 120, thereby reducing crosstalk between pixels and improving the directivity of light. The image sensor 120 can Perform detection and generate high-quality image information corresponding to the fingerprint.

This embodiment also provides another fingerprint input device 20. Referring to FIG. 8, the fingerprint input device 20 includes a light-emitting layer 210, a collimating layer 220 arranged on the non-light source side of the light-emitting layer 210, and a collimating layer 220 arranged away from the light source. The image sensor 230 on one side of the light emitting layer 210, the encapsulation layer 240 provided on the light emitting layer 210, and the transparent cover 250 provided on the encapsulation layer 240. For the light-emitting layer 210, the collimating layer 220, and the image sensor 230, refer to the related description of the light-emitting layer 110, the collimating layer 120, and the image sensor 130 in the previous embodiment, which will not be repeated here.

In this embodiment, in order to prevent the light-emitting layer 210 from being affected by the environment and isolate oxygen and moisture, thereby improving the light-emitting stability of the light-emitting layer 210 and the service life of the fingerprint input device, the fingerprint input device further includes a device disposed on the light-emitting layer 210 Encapsulation layer 240. The encapsulation layer 240 is a light-transmitting layer, which may be a single-layer structure or a stack of multiple layers; it may be a substrate or a film. The material of the encapsulation layer 240 is not limited. For example, it may be an inorganic material layer, including but not limited to silicon oxide, silicon nitride, etc., which may serve as an effective water/oxygen barrier layer; it may also be an organic material layer, including but not limited to Materials such as high molecular polymers and resins can be used as flexible packaging layers.

In this embodiment, in order to increase the service life of the fingerprint input device, the fingerprint input device 20 further includes a transparent cover 250 disposed on the packaging layer 240 to protect the light emitting layer 210, the collimation layer 220, and the image sensor 230. The transparent cover has a fingerprint contact surface, which can directly contact the finger.

The fingerprint input device provided in this embodiment includes a light-emitting layer 210, a collimation layer 220, an image sensor 230, an encapsulation layer 240, and a transparent cover 250. The light emitted by the light-emitting layer 210 is reflected back by the fingerprint, and the reflected light passes through the collimation The layer 220 is incident on the pixel array of the image sensor 230 at a preset angle, thereby reducing crosstalk between pixels and improving the directivity of light. The image sensor 220 can detect and generate high-quality image information corresponding to the fingerprint; The encapsulation layer 240 and the transparent cover 250 can further isolate the influence of the environment on the fingerprint input device 20, improve the stability and safety of the fingerprint input device 20, and increase the service life.

This embodiment also provides a display device, which includes the fingerprint input device as described in the above embodiment. The display device provided in this embodiment can display high-quality image information corresponding to fingerprints.

The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, All should be considered as the scope of this specification.

The above-mentioned embodiments only express several implementation manners of this application, and their descriptions are more specific and detailed, but they should not be construed as limiting the scope of this application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can be made, and these all fall within the protection scope of this application. Therefore, the scope of protection of the patent of this application shall be subject to the appended claims.

Claims

A fingerprint input device, including:

Luminescent layer

A collimation layer disposed on the non-light source side of the light-emitting layer, the collimation layer being configured to incident light reflected by the fingerprint onto the image sensor at a preset angle; and

An image sensor arranged on the side of the collimating layer facing away from the light emitting layer, the image sensor being arranged to sense light reflected by the fingerprint, and generate image information corresponding to the fingerprint according to the reflected light.
The fingerprint input device according to claim 1, wherein the fingerprint input device further comprises an encapsulation layer provided on the light-emitting layer.
3. The fingerprint input device according to claim 2, wherein the fingerprint input device further comprises a transparent cover plate arranged on the encapsulation layer, the transparent cover plate having a fingerprint contact surface.
The fingerprint input device according to claim 1, wherein the light-emitting layer comprises:

A drive backplane provided on the collimation layer; and

A light-emitting unit arranged on the drive backplane.
4. The fingerprint input device according to claim 4, wherein the driving backplane includes a light-transmitting area and a non-light-transmitting area; the light reflected by the fingerprint is incident to the collimating layer through the light-transmitting area.
4. The fingerprint input device according to claim 4, wherein the driving backplane comprises a substrate and a pixel array arranged on the substrate, and a color filter is attached to the pixel array.
7. The fingerprint input device of claim 6, wherein the color filter includes color resists corresponding to red, green, blue, and white, respectively.
4. The fingerprint input device according to claim 4, wherein the light emitting unit comprises a first electrode and a second electrode disposed oppositely, and an organic light emitting layer disposed between the first electrode and the second electrode.
4. The fingerprint input device according to claim 4, wherein the light emitting unit comprises an anode, a hole injection layer, a first hole transport layer, a blue light emitting layer, a first electron transport layer, and a first electron injection layer arranged in sequence. , Intermediate connector, second hole transport layer, red and green light emitting layer, second electron transport layer, second electron injection layer and cathode.
The fingerprint input device according to claim 1, wherein the collimation layer comprises a collimator, the collimator has an array of openings, and the array of openings is configured to perpendicularly incident light reflected by the fingerprint to the image sensor on.
The fingerprint input device according to claim 10, wherein the shape of the openings in the opening array includes a cylindrical shape or a conical shape.
The fingerprint input device according to claim 10, wherein the sidewalls of the holes in the array of holes are provided with grooves.
The fingerprint input device according to claim 1, wherein the collimation layer comprises an optical fiber plate composed of a fiber bundle composed of a plurality of optical fibers, the plurality of optical fibers are spaced apart and arranged in parallel, and the optical fiber axis of the optical fiber is aligned with the finger The normal of the contact surface forms a predetermined inclination angle, and the optical fiber is arranged to incident the light reflected by the fingerprint onto the image sensor along the inclination angle direction.
The fingerprint input device according to claim 1, wherein the thickness of the collimation layer may be 20 μm-2000 μm.
The fingerprint input device according to claim 1, wherein the image sensor includes a phototransistor sensor array and a sensor pixel array.
The fingerprint input device according to claim 15, wherein the phototransistor sensor array includes a-Si TFT phototransistor sensor, and the sensor pixel array includes a-Si TFT pixels.
A fingerprint input device, including:

Luminescent layer

A collimation layer disposed on the non-light source side of the light-emitting layer, the collimation layer being configured to incident light reflected by the fingerprint onto the image sensor at a preset angle; and

An image sensor arranged on the side of the collimating layer away from the light-emitting layer, the image sensor being arranged to sense light reflected by the fingerprint, and generate image information corresponding to the fingerprint according to the reflected light;

Wherein, the light-emitting layer includes a driving backplane disposed on the collimation layer and a light-emitting unit disposed on the driving backplane; the driving backplane includes a light-transmitting area and a non-light-transmitting area, fingerprint-reflective Light enters the collimating layer through the light-transmitting area;

The collimation layer includes a collimator, the collimator has an array of openings, and the array of openings is configured to perpendicularly incident the light reflected by the fingerprint onto the image sensor; or the collimation layer includes a plurality of optical fibers. An optical fiber board composed of a fiber bundle, a plurality of the optical fibers are spaced apart and arranged in parallel, the optical fiber axis of the optical fiber forms a predetermined inclination angle with the normal of the finger contact surface, and the optical fiber is set to reflect the fingerprint light along the inclination direction Incident on the image sensor;

The image sensor includes a phototransistor sensor array and a sensor pixel array, the phototransistor sensor array includes a-Si TFT phototransistor sensor, and the sensor pixel array includes a-Si TFT pixels.
A display device comprising the fingerprint input device according to claim 1.