WO2020211567A1 - 电容式微机械超声换能器及其制备方法、电容式微机械超声换能器面板和显示面板 - Google Patents
电容式微机械超声换能器及其制备方法、电容式微机械超声换能器面板和显示面板 Download PDFInfo
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- WO2020211567A1 WO2020211567A1 PCT/CN2020/078214 CN2020078214W WO2020211567A1 WO 2020211567 A1 WO2020211567 A1 WO 2020211567A1 CN 2020078214 W CN2020078214 W CN 2020078214W WO 2020211567 A1 WO2020211567 A1 WO 2020211567A1
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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
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/0203—Particular design considerations for integrated circuits
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- each of the vibrating film layer of the sensor and the protective layer of the thin film transistor is a SiNx layer or includes a stacked SiNx layer and an SiOx layer.
- the gate insulating layer 27 of the thin film transistor 2 is provided in the same layer as the barrier layer 17 of the sensor 1, and the active layer 26 of the thin film transistor 2 is provided between the gate insulating layer 27 and the protective layer 23 of the thin film transistor 2
- the cavity 16 of the sensor 1 is arranged between the barrier layer 17 of the sensor 1 and the vibrating membrane layer 13.
- the gate insulating layer 27 of the thin film transistor 2 and the barrier layer 17 of the sensor 1 may be formed of the same material.
- the vibration film layer 13 of the sensor 1 and the protective layer of the thin film transistor 2 are formed on the sacrificial layer of the sensor 1 and the active layer 26 of the thin film transistor 2, respectively. 23.
- the film layer 13 is arranged in the same layer as the first protective layer 23 of the thin film transistor 2, the through hole 15 is formed on the first vibrating film layer 13, and the through hole 15 is in communication with the sacrificial layer, and After the sacrificial layer is removed through the through hole 15 so that the sacrificial layer is formed into a cavity 16, a second vibrating film layer 13 is formed on the first vibrating film layer 13 of the sensor 1. The second vibrating film layer 13 fills the through hole 15 to close the cavity 16.
- the preparation method further includes: forming a second vibrating film layer 13 on the first vibrating film layer 13 of the sensor 1.
- a second protective layer 23 is formed on the first protective layer 23 of the transistor 2, and the second vibrating film layer 13 and the second protective layer 23 are provided in the same layer.
- the preparation method may further include: forming the upper electrode layer 14 of the sensor 1 and the thin film transistor 2 on the second vibration film layer 13 of the sensor 1 and the second protective layer 23 of the thin film transistor 2 respectively.
- the source electrode 24 and the drain electrode 25, the upper electrode layer 14 is electrically connected to the source electrode 24 or the drain electrode 25, and the upper electrode layer 14 is arranged in the same layer as the source electrode 24 and the drain electrode 25.
- FIGS. 3 to 7 the components of the capacitive micromachined ultrasonic transducer formed by each step of the method for manufacturing a capacitive micromachined ultrasonic transducer provided in an embodiment of the present invention Schematic diagram.
- the exemplary preparation method is described as follows in conjunction with the accompanying drawings:
- a base substrate 10 is provided, and the lower electrode layer 11 of the sensor and the gate 21 of the thin film transistor 2 are formed on the base substrate 10.
- the lower electrode layer 11 and the gate 21 are provided in the same layer. .
- the base substrate 10 may be a rigid substrate, such as a glass substrate, or a flexible substrate, such as a plastic substrate.
- Each of the lower electrode layer 11 and the gate 21 of the thin film transistor 2 may be composed of one or more of the following metals: copper (Cu), aluminum (Al), molybdenum (Mo), niobium (Nb), Neodymium (Nd) and titanium (Ti), for example, may be made of Al, and the thickness of each of the lower electrode layer 11 and the gate 21 of the thin film transistor 2 may be between 0.1 ⁇ m and 1 ⁇ m.
- each of the gate insulating layer 17 and the barrier layer 27 may be SiNx, and the thickness may be between 0.2 ⁇ m and 0.6 ⁇ m.
- each of the upper electrode layer 14 and the source electrode 24 and the drain electrode 25 may be composed of one or more of the following metals: Cu, Al, Mo, Nb, Nd, Ti, for example, the upper electrode layer 14
- the source electrode 24 and the drain electrode 25 may be made of Al, and the thickness of each of the upper electrode layer 14 and the source electrode 24 and the drain electrode 25 may be between 0.1 ⁇ m and 1 ⁇ m.
- FIGS. 8 to 13 the capacitive micromachined ultrasonic transducer formed by each step of the manufacturing method of another capacitive micromachined ultrasonic transducer provided in the embodiment of the present invention Schematic diagram of the components.
- the exemplary preparation method is described as follows in conjunction with the accompanying drawings:
- Each of the lower electrode layer 11 and the gate 21 of the thin film transistor 2 may be composed of one or more of the following metals: Cu, Al, Mo, Nb, Nd, Ti, for example, may be composed of Al,
- the thickness of each of the electrode layer 11 and the gate 21 of the thin film transistor 2 may be between 0.1 ⁇ m and 1 ⁇ m.
- Each of the sacrificial layer 12 and the active layer 26 may be amorphous silicon (A-Si) with a thickness between 0.2 ⁇ m and 1 ⁇ m.
- first vibrating film layer 131 and the second vibrating film layer 132 may jointly constitute the vibrating film layer 13.
- each of the upper electrode layer 14 and the source 24 and the drain 25 may be composed of one or more of the following metals: Cu, Al, Mo, Nb, Nd, Ti, for example, Al, upper
- the thickness of each of the electrode layer 14 and the source 24 and the drain 25 may be between 0.1 ⁇ m and 1 ⁇ m.
- the embodiments of the present disclosure also provide a capacitive micromachined ultrasonic transducer panel, including the aforementioned capacitive micromachined ultrasonic transducer, for example, a plurality of the aforementioned capacitive micromachined ultrasonic transducer arranged in an array.
- the distance between any two adjacent capacitive micromachined ultrasonic transducers can range from 5 ⁇ m to 50 ⁇ m.
- the embodiments of the present disclosure also provide a display panel including the above-mentioned capacitive micromachined ultrasonic transducer, for example, including a plurality of the above-mentioned capacitive micromachined ultrasonic transducer arranged in an array.
- the display panel may be a liquid crystal display panel or an OLED display panel or the like.
- the display panel can be applied to any products or components with display functions such as liquid crystal display devices, electronic paper, OLED display devices, mobile phones, tablet computers, televisions, monitors, notebook computers, digital photo frames, navigators, etc.
- the capacitive micromachined ultrasonic transducer provided by the embodiments of the present disclosure includes a sensor and a thin film transistor.
- the sensor includes a base substrate, a lower electrode layer, a vibrating film layer, and an upper electrode layer stacked from bottom to top, wherein the lower electrode layer There is a cavity between the vibrating film layer and the upper electrode layer is connected to the source or drain of the thin film transistor, and the lower electrode layer is set on the same layer as the gate of the thin film transistor, and the vibrating film layer is the same layer as the protective layer of the thin film transistor.
- the upper electrode layer is arranged in the same layer as the source and drain of the thin film transistor. According to the technical solution of the embodiment of the present disclosure, the thin film transistor and the sensor are combined to form a capacitive micromachined ultrasonic transducer capable of fingerprint recognition, which is simple to implement and has high recognition accuracy.
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- Theoretical Computer Science (AREA)
- Multimedia (AREA)
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- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Transducers For Ultrasonic Waves (AREA)
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- Image Input (AREA)
- Thin Film Transistor (AREA)
Abstract
Description
Claims (23)
- 一种电容式微机械超声换能器,所述电容式微机械超声换能器包括:薄膜晶体管,所述薄膜晶体管包括:栅极、源极和漏极;以及传感器,其中:所述传感器包括:由下至上层叠设置的下电极层、振动膜层和上电极层,所述下电极层和所述振动膜层之间存在有空腔,所述上电极层电连接至所述薄膜晶体管的源极或漏极,所述上电极层与所述薄膜晶体管的源极和漏极同层设置,并且所述下电极层与所述薄膜晶体管的栅极同层设置。
- 根据权利要求1所述的电容式微机械超声换能器,其中:所述薄膜晶体管还包括有源层和设置在有源层上的保护层,所述传感器的所述振动膜层与所述薄膜晶体管的保护层同层设置,所述薄膜晶体管的有源层与所述传感器的空腔同层设置。
- 根据权利要求2所述的电容式微机械超声换能器,其中:所述薄膜晶体管还包括栅极绝缘层,所述栅极绝缘层覆盖所述薄膜晶体管的栅极,所述传感器还包括阻挡层,所述阻挡层覆盖所述下电极层,所述薄膜晶体管的栅极绝缘层与所述传感器的阻挡层同层设置,所述薄膜晶体管的有源层设置在所述薄膜晶体管的栅极绝缘层与保护层之间,并且所述传感器的空腔设置在所述传感器的阻挡层与所述振动膜层之间。
- 根据权利要求1所述的电容式微机械超声换能器,其中:所述薄膜晶体管构造成响应于输入栅极的控制信号,将所述传感器检测的电信号从所述上电极层经由所述薄膜晶体管的漏极或源极输出。
- 根据权利要求1所述的电容式微机械超声换能器,还包括:衬底基板,所述传感器和薄膜晶体管设置在所述衬底基板上。
- 根据权利要求1所述的电容式微机械超声换能器,其中:所述上电极层和所述振动膜层设置有通孔,且所述通孔与所述空 腔连通。
- 根据权利要求6所述的电容式微机械超声换能器,其中;所述通孔的直径范围为1至10μm。
- 根据权利要求1所述的电容式微机械超声换能器,其中:所述振动膜层包括层叠的第一振动膜层和第二振动膜层,所述空腔被所述第二振动膜层密封。
- 根据权利要求1-8任一项所述的电容式微机械超声换能器,其中,所述电容式微机械超声换能器呈正方形、圆形和六边形中的任意一种形状。
- 根据权利要求1-8任一项所述的电容式微机械超声换能器,其中,所述电容式微机械超声换能器呈圆形,所述电容式微机械超声换能器的直径范围为20至300μm。
- 根据权利要求2所述的电容式微机械超声换能器,其中:所述传感器的所述振动膜层与所述薄膜晶体管的保护层中的每一个是SiNx层或包括层叠的SiNx层和SiOx层。
- 根据权利要求3所述的电容式微机械超声换能器,其中:所述薄膜晶体管的栅极绝缘层的材料与所述传感器的阻挡层的材料相同。
- 一种电容式微机械超声换能器面板,包括如权利要求1-12中任一项所述的电容式微机械超声换能器。
- 一种显示面板,包括如权利要求1-12中任一项所述的电容式微机械超声换能器。
- 一种电容式微机械超声换能器的制备方法,包括:提供衬底基板;在所述衬底基板的一侧形成传感器的下电极层和薄膜晶体管的栅极,所述下电极层与所述栅极同层设置;在传感器的下电极层和薄膜晶体管的栅极的远离衬底基板的一侧形成传感器的牺牲层和薄膜晶体管的有源层,所述牺牲层与所述有 源层同层设置;在传感器的牺牲层和薄膜晶体管的有源层上分别形成传感器的振动膜层和薄膜晶体管的保护层,所述振动膜层与所述保护层同层设置,在所述振动膜层上形成有通孔,所述通孔与所述牺牲层连通;以及通过所述通孔,将所述牺牲层去除,使所述牺牲层形成空腔。
- 根据权利要求15所述的电容式微机械超声换能器的制备方法,还包括:在所述传感器的振动膜层和薄膜晶体管的保护层上分别形成上电极层和源极和漏极,其中,所述通孔在所述衬底基板上的正投影在所述上电极层在所述衬底基板上的正投影之外,所述上电极层电连接至所述源极或漏极,且所述上电极层与所述源极和所述漏极同层设置。
- 根据权利要求15所述的电容式微机械超声换能器的制备方法,还包括:在所述衬底基板的一侧形成传感器的下电极层和薄膜晶体管的栅极之后,并且在传感器的下电极层和薄膜晶体管的栅极的远离衬底基板的一侧形成传感器的牺牲层和薄膜晶体管的有源层之前,形成所述薄膜晶体管的栅极绝缘层和所述传感器的阻挡层,所述栅极绝缘层覆盖所述薄膜晶体管的栅极,所述阻挡层覆盖所述传感器的下电极层,所述薄膜晶体管的栅极绝缘层与所述传感器的阻挡层同层设置,所述薄膜晶体管的有源层设置在所述薄膜晶体管的栅极绝缘层与保护层之间,并且所述传感器的空腔设置在所述传感器的阻挡层与所述振动膜层之间。
- 根据权利要求15所述的电容式微机械超声换能器的制备方法,其中:在传感器的牺牲层和薄膜晶体管的有源层上分别形成传感器的振动膜层和薄膜晶体管的保护层,包括:在传感器的牺牲层和薄膜晶体管的有源层上分别形成传感器的第一振动膜层和薄膜晶体管的第一保护层,所述传感器的第一振动膜层与所述薄膜晶体管的第一保护层同层设置,在所述第一振动膜层上形成有所述通孔,所述通孔与所 述牺牲层连通,以及在通过所述通孔,将所述牺牲层去除,使所述牺牲层形成空腔之后,在所述传感器的第一振动膜层上形成第二振动膜层,所述第二振动膜层填充所述通孔,使所述空腔封闭。
- 根据权利要求18所述的电容式微机械超声换能器的制备方法,还包括:在所述传感器的第一振动膜层上形成第二振动膜层的同时在所述薄膜晶体管的第一保护层上形成第二保护层,所述第二振动膜层与所述第二保护层同层设置。
- 根据权利要求19所述的电容式微机械超声换能器的制备方法,还包括:在所述传感器的第二振动膜层和所述薄膜晶体管的第二保护层上分别形成所述传感器的上电极层和所述薄膜晶体管的源极和漏极,所述上电极层电连接至所述源极或漏极,且所述上电极层与所述源极和所述漏极同层设置。
- 根据权利要求15所述的电容式微机械超声换能器的制备方法,其中:所述牺牲层与所述有源层由非晶硅形成。
- 根据权利要求15所述的电容式微机械超声换能器的制备方法,其中:所述传感器的所述振动膜层与所述薄膜晶体管的保护层中的每一个是SiNx层或包括层叠的SiNx层和SiOx层。
- 根据权利要求17所述的电容式微机械超声换能器的制备方法,其中:所述薄膜晶体管的栅极绝缘层与所述传感器的阻挡层由相同的材料形成。
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WO2021077381A1 (zh) * | 2019-10-25 | 2021-04-29 | 京东方科技集团股份有限公司 | 电容式微机械超声换能单元及其制备方法、面板、装置 |
CN110783326B (zh) * | 2019-10-31 | 2021-12-17 | 京东方科技集团股份有限公司 | 一种基板及其制备方法、显示面板及显示装置 |
TWI706561B (zh) | 2019-11-18 | 2020-10-01 | 友達光電股份有限公司 | 顯示裝置及其製造方法 |
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