WO2020052329A1 - 一种屏下图像获取结构及电子设备 - Google Patents
一种屏下图像获取结构及电子设备 Download PDFInfo
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- WO2020052329A1 WO2020052329A1 PCT/CN2019/094572 CN2019094572W WO2020052329A1 WO 2020052329 A1 WO2020052329 A1 WO 2020052329A1 CN 2019094572 W CN2019094572 W CN 2019094572W WO 2020052329 A1 WO2020052329 A1 WO 2020052329A1
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- light
- light source
- sensor
- area
- under
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
Definitions
- the invention relates to the technical field of imaging under a screen, and in particular, to an image acquiring structure under a screen and an electronic device.
- biometric recognition technology is playing an increasingly important role in ensuring information security.
- fingerprint recognition has become one of the key technical means for identity recognition and device unlocking widely used in the mobile Internet field.
- capacitive fingerprint recognition has been unable to meet the needs, while ultrasonic fingerprint recognition has technical maturity and cost problems.
- Optical fingerprint recognition is expected to become an under-screen fingerprint. Identification of mainstream technology solutions.
- the existing optical fingerprint recognition scheme is based on the geometric optical lens imaging principle.
- the fingerprint module used includes microlens arrays, optical space filters and other components. It has many shortcomings such as complex structure, thick module, small sensing range, high cost, etc.
- the imaging area of the current under-screen optical imaging is generally smaller than the sensor area. In order to obtain a larger imaging area, a larger sensor is needed, which will occupy the space under the screen.
- the inventor provides an image acquisition structure under the screen, which includes a light-transmitting cover plate, a light source plate, and a light sensor.
- the light source plate and the light sensor are disposed below the light-transmitting cover plate.
- the light cover plate has a light transmission area beyond the edge of the light sensor, and the light source plate has a light source area beyond the edge of the light sensor along the direction of the light transmission area. After the light from the light source in the light source area is totally reflected by the light cover Into the light sensor.
- the light source area extends beyond the edge of the light-transmissive cover plate.
- the light source board is disposed above the light sensor.
- the plane of the light sensor includes a right angle
- the light source region of the light source plate is arc-shaped at the right angle
- the normal distance between the light source of the light source plate and the light source incident on the light-transmitting cover plate at a critical angle is denoted as d, and the distance D from the edge of the light source region to the edge of the light sensor is greater than the distance d.
- the distance between the edge of the light transmitting area and the edge of the light sensor is D-d.
- the light source board is a display panel.
- the display panel is a liquid crystal display, an active matrix organic light emitting diode display or a micro light emitting diode display.
- the light transmitting region or the light source region surrounds the outer periphery of the light sensor.
- the invention provides an electronic device including a processor and an image acquisition structure connected to the processor.
- the image acquisition structure is the above-mentioned image acquisition structure under the screen.
- the above technical solution uses the principle of optical total reflection, so that image data outside the range of the light sensor can be collected by the light sensor, increasing the effective imaging area of the small-sized imaging sensor, so that the area of the fingerprint being imaged exceeds that of the sensor. Area so that image information for lensless imaging can be effectively used. This can reduce the area of the light sensor and avoid taking up too much space under the screen.
- FIG. 1 is a schematic diagram of realizing optical fingerprint imaging under a lensless screen using a total reflection imaging principle
- FIG. 2 is a schematic diagram of an imaging structure and imaging diagram of an under-screen image according to an embodiment of the present invention
- FIG. 3 is a schematic structural diagram of a light sensor and a light source board according to an embodiment
- FIG. 4 is a schematic diagram of a fingerprint image collected on a light sensor and a light transmitting panel according to an embodiment.
- O luminous point
- A the contact point between the luminous point and the transparent cover
- the under-screen image imaging structure includes a light-transmissive cover plate, a light source plate, and a light sensor.
- the light-source plate and light sensor are disposed below the light-transmissive cover plate.
- the light-transmissive cover plate, light source plate, and light sensor are arranged in parallel.
- the light source board is a plurality of light sources arranged on one board.
- the light-transmitting cover plate may be a single-layer plate structure or a multilayer structure.
- the single-layer structure may be a glass cover plate or an organic light-transmitting material cover plate.
- the single-layer cover plate may also be a cover plate having other functions, such as a touch screen.
- the multilayer structure may be a multilayer glass cover or a multilayer organic transparent material cover or a combination of a glass cover and an organic transparent material cover.
- the light sensor is used for obtaining light, and includes a plurality of photosensitive units, which can be separately arranged below the light source board or on the light source board. When placed under the light source board, light can enter the light sensor through the gap between the light sources on the light source board. When set on the light source board, the photosensitive unit can be set in the light source (pixel point) gap of the light source board.
- the sensor can be set under the screen image imaging structure for acquiring the image under the screen, such as fingerprint fingerprint print.
- the transparent cover and the light source board need to be filled with optical glue to connect and avoid the reflection of light by the air.
- the refractive index of the optical glue should be close to the refractive index of the transparent cover to avoid the total reflection of light between the optical glue and the transparent cover. .
- the principle of total reflection imaging is that when imaging, the finger is in contact with the transparent cover. Due to the air in the fingerprint depression, the light with an incident angle exceeding the critical angle of total reflection will form total reflection. The light sensor will collect bright light and the fingerprint will be convex. If it comes into contact with the upper surface of the light-transmissive cover, the light will not be totally reflected, so the light sensor will collect the darker light, which can distinguish the fingerprint image.
- imaging as shown in Figure 1, press your finger to a point A on the cover glass, and the light from the light source board is imaged on the surface of the sensor through the total reflection of B on the transparent cover. Point, according to the light data collected at point B, the fingerprint image at point A can be obtained.
- the super imaging under-screen image acquisition structure of this embodiment is shown in FIG. 2 and includes a light-transmitting cover plate, a light source plate, and a light sensor, and the light source plate and the light sensor are disposed below the light-transmitting cover plate.
- the light-transmitting cover plate has a light-transmitting area 1 beyond the edge of the light sensor
- the light source plate has a light-source area 2 extending beyond the edge of the light-sensor along the direction of the light-transmitting area. After total reflection, it enters the light sensor.
- the light O from the light source area 2 can enter the light transmission area 1 and be totally reflected on the light sensor. Although there is no light sensor under the fingerprint at point A on the light transmission cover, the light sensor can still obtain A.
- the collected fingerprint image 5 will be larger than the range of the light sensor 3. That is, the light transmission area 1 is beyond the plane where the light sensor is located in the projection direction of the vertical light transmission cover, so that the light sensor can obtain a fingerprint image larger than the area of the light sensor. In this way, when acquiring fingerprint images of the same area, a light sensor with a smaller area can be used in this embodiment, which saves the volume under the light source board.
- the light-transmitting cover plate can be the same size as the light source plate, that is, the light transmitting area 1 and the light source area 2 are the same size.
- the transparent area 1 such as the edge
- the fingerprint image cannot be acquired, and the transparent cover is wasted.
- the size of the light source plate is Larger than the light-transmissive cover, that is, the light source region extends beyond the edge of the light-transmissive cover, that is, a part of the light-source region perpendicular to the projection of the light-transmissive cover is outside the light-transmissive region 1.
- the application is not limited to the shape of the light sensor, and may be circular or square.
- the plane of the light sensor 3 includes a right angle.
- the light source board 4 The light source area is arc-shaped at the right angle.
- the normal X distance between the light source of the light source plate and the light source incident on the light-transmitting cover plate at a critical angle is recorded as d, then the edge of the light source area The distance D from the edge of the light sensor is greater than the distance d.
- the critical angle is the incident angle at which the incident light just emitted total reflection on the light-transmitting cover plate, and the incident light smaller than the critical angle does not emit total reflection.
- the normal line X is a straight line perpendicular to the light-transmitting cover plate, and the vertical point is the intersection of the critical angle light and the upper surface of the light-transmitting cover plate.
- the distance d is constant.
- the distance D is the distance between the edge of the light source area away from the light sensor and the edge of the light sensor near the light source area in a direction perpendicular to the projection direction of the light-transmissive panel.
- the distance D is greater than the distance d, the light source area Light rays with a distance greater than d will form a total reflection on the light-transmitting area, so that a fingerprint image can be acquired on the light-transmitting area. Since the light-transmitting area 1 is beyond the light sensor in the projection direction of the vertical light-transmissive cover plate. Flat, so the light sensor can capture fingerprint images larger than the area of the light sensor.
- the arc radius of the light source region at the right angle is the distance D.
- the distance between the edge of the area where the total reflection can occur in the light transmitting area and the edge of the light sensor is Dd.
- the preferred distance between the edge of the light transmitting area and the edge of the light sensor is Dd. Total reflection can occur, so that all fingerprint images on the light-transmitting area can be obtained.
- the total reflection fingerprint imaging can be without the longest distance limitation, that is, the distance D can be infinitely large.
- the distance D can be infinitely large.
- the totally reflected light will be blocked by the side of the light source and cannot enter the light sensor from the gap between the light sources. Therefore, there is a maximum value for the horizontal distance of the total reflection imaging illuminated by a single point light source, as shown by the imaging point C in FIG. 3, and this value can be obtained through experiments.
- the size of the sensor is a square of K ⁇ K size (where K is the side length of the sensor)
- K is the side length of the sensor
- the principle of time-division multiplexing can be used and the light source can be used. Bright points of different light sources are illuminated on the board, and the fingerprints outside the light sensor are projected onto the sensor.
- the imaging area on the transparent cover can be extended to a size of (K + Dd) 2 with four corners as a circle of radius D. As shown in Figure 3.
- the light source dot matrix can image the fingerprints in the area farthest D onto the light sensor; in order to obtain fingerprint information with an area of (K + Dd) 2 , you need to design a light source dot matrix on the light source plate in a circular area At this time, the distance between the outermost dot matrix is about 0.5D, the center of the bright spot is about 2d from the sensor boundary, and the light-transmitting cover area corresponding to the four corners of the light sensor will have a semicircle with a radius of about 2d. At this time, the light-transmitting cover The image outside the sensor on the board can be imaged on the sensor to achieve external super imaging. The internal imaging of the sensor also follows the aforementioned super imaging principle.
- the light source point on the light source board When the light source point on the light source board is driven, the bright point is designed at a distance. At the size d of the sensor boundary, scanning is still performed at a distance of 0.5D, and then progressively narrowed inward at a distance of d, so that all fingerprints can be scanned, as shown in FIG. 3. That is, in an embodiment, the light sources on the light source board may be arranged at a horizontal pitch d and a vertical pitch 0.5D. In this case, the vertical direction is the same as the edge of the light sensor, and the horizontal direction is perpendicular to the edge of the light sensor.
- the light source may be a single light source for obtaining images under the screen, such as a solid-color LED light source.
- a display panel contains a plurality of pixels for display, and different images can be displayed by driving the amount and color of different pixels.
- the display panel includes a liquid crystal display (LCD), an active matrix organic light emitting diode (AMOLED) display, or a micro-LED display, all of which scan and drive a single unit with a thin film transistor (TFT) structure.
- Pixels can achieve single driving of pixels, that is, driving of point light sources and array display of multiple point light sources. At the same time, light can enter the light sensor after passing through the gap of the pixel points.
- the present invention is not limited to the distribution form of the light-transmitting area or the light source area, and the light-transmitting area may be only on one side or both sides of the light sensor (as shown in FIG. 4). Or in some embodiments, as shown in FIG. 3, the light transmission area or the light source area surrounds the outer periphery of the light sensor, so that the fingerprint acquisition area on the light transmission cover can be enlarged as much as possible.
- the present invention provides an electronic device including a processor and an image acquisition structure connected to the processor.
- the image acquisition structure is the above-mentioned image acquisition structure under the screen.
- an electronic device drives a light source board through a processor, an image of the surface of the light-transmitting cover plate can be collected on the light sensor. Only a small sensor size is needed, which can reduce the volume occupied by the sensor under the light source board. It is an existing electronic device. Free up more space, which can be used for the battery, which can extend the battery life of the electronic device.
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- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Image Input (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
Description
Claims (10)
- 一种屏下图像获取结构,其特征在于:包括透光盖板、光源板和光线传感器,所述光源板、光线传感器置于所述透光盖板的下方,所述透光盖板具有超出光线传感器边缘的透光区,所述光源板沿所述透光区方向具有超出光线传感器边缘的光源区,所述光源区的光源的光线经过透光盖板的全反射后射入光线传感器上。
- 根据权利要求1所述的一种屏下图像获取结构,其特征在于:所述光源区超出透光盖板边缘。
- 根据权利要求1所述的一种屏下图像获取结构,其特征在于:所述光源板置于所述光线传感器的上方。
- 根据权利要求1所述的一种屏下图像获取结构,其特征在于:所述光线传感器平面包括有直角,所述光源板的光源区域在所述直角处为圆弧形。
- 根据权利要求1所述的一种屏下图像获取结构,其特征在于:所述光源板的光源与该光源以临界角入射透光盖板的法线距离记为d,所述光源区边缘距离光线传感器边缘的距离D大于所述距离d。
- 根据权利要求5所述的一种屏下图像获取结构,其特征在于:所述透光区边缘距离光线传感器边缘的距离为D-d。
- 根据权利要求1所述的一种屏下图像获取结构,其特征在于:所述光源板为显示面板。
- 根据权利要求7所述的一种屏下图像获取结构,其特征在于:所述显示面板为液晶显示屏、有源阵列式有机发光二极管显示屏或微发光二极管显示屏。
- 根据权利要求1所述的一种屏下图像获取结构,其特征在于:所述透光区或者所述光源区环绕光线传感器外周。
- 一种电子设备,其特征在于:包括处理器和与处理器连接的图像获取结构,所述图像获取结构为权利要求1到9任一项所述的一种屏下图像获取结构。
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US17/275,586 US20220198818A1 (en) | 2018-09-12 | 2019-07-03 | Under-display image acquisition structure and electronic device |
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CN201811062585.4A CN110895666A (zh) | 2018-09-12 | 2018-09-12 | 一种屏下图像获取结构及电子设备 |
CN201811062585.4 | 2018-09-12 |
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WO2020052329A1 true WO2020052329A1 (zh) | 2020-03-19 |
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PCT/CN2019/094572 WO2020052329A1 (zh) | 2018-09-12 | 2019-07-03 | 一种屏下图像获取结构及电子设备 |
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US (1) | US20220198818A1 (zh) |
CN (1) | CN110895666A (zh) |
TW (1) | TWI821326B (zh) |
WO (1) | WO2020052329A1 (zh) |
Citations (3)
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US20070274101A1 (en) * | 2006-05-25 | 2007-11-29 | Samsung Electronics Co., Ltd. | Illumination sensing device for portable terminal |
CN206331451U (zh) * | 2016-12-27 | 2017-07-14 | 广东欧珀移动通信有限公司 | 指纹识别模块及终端 |
CN107220622A (zh) * | 2017-05-27 | 2017-09-29 | 北京小米移动软件有限公司 | 有机发光二极管显示模组及其控制方法 |
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KR101928319B1 (ko) * | 2015-06-18 | 2018-12-12 | 선전 구딕스 테크놀로지 컴퍼니, 리미티드 | 광 감지 능력을 가지는 다기능 지문 센서 |
CN106022325B (zh) * | 2016-08-05 | 2019-08-09 | 上海箩箕技术有限公司 | 光学指纹传感器模组 |
CN108229241A (zh) * | 2016-12-09 | 2018-06-29 | 上海箩箕技术有限公司 | 显示模组及其使用方法 |
CN207182338U (zh) * | 2017-09-15 | 2018-04-03 | 南昌欧菲生物识别技术有限公司 | 光学指纹识别组件和电子装置 |
CN207601817U (zh) * | 2017-11-30 | 2018-07-10 | 北京集创北方科技股份有限公司 | 生物特征检测装置和终端 |
KR20190066433A (ko) * | 2017-12-05 | 2019-06-13 | 삼성전자주식회사 | 마이크로 홀이 형성된 차광 부재를 포함하는 전자 장치 |
CN107832752B (zh) * | 2017-12-15 | 2021-04-27 | 京东方科技集团股份有限公司 | 指纹识别面板、全屏指纹识别方法及显示装置 |
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2018
- 2018-09-12 CN CN201811062585.4A patent/CN110895666A/zh active Pending
-
2019
- 2019-07-03 WO PCT/CN2019/094572 patent/WO2020052329A1/zh active Application Filing
- 2019-07-03 US US17/275,586 patent/US20220198818A1/en not_active Abandoned
- 2019-07-04 TW TW108123656A patent/TWI821326B/zh active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US20070274101A1 (en) * | 2006-05-25 | 2007-11-29 | Samsung Electronics Co., Ltd. | Illumination sensing device for portable terminal |
CN206331451U (zh) * | 2016-12-27 | 2017-07-14 | 广东欧珀移动通信有限公司 | 指纹识别模块及终端 |
CN107220622A (zh) * | 2017-05-27 | 2017-09-29 | 北京小米移动软件有限公司 | 有机发光二极管显示模组及其控制方法 |
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US20220198818A1 (en) | 2022-06-23 |
TWI821326B (zh) | 2023-11-11 |
CN110895666A (zh) | 2020-03-20 |
TW202024990A (zh) | 2020-07-01 |
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