CN107066920A - Fingerprint recognition panel and device - Google Patents
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- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
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Abstract
本发明公开了一种指纹识别面板及装置，其中面板具有两层结构，一层为透明指纹感测阵列，另一层为透明信号处理电路；透明指纹感测阵列和透明信号处理电路之间设置有透明绝缘薄膜，透明绝缘薄膜上设置有通孔，透明指纹感测阵列和透明信号处理电路之间通过通孔连接；透明指纹感测阵列包括多个透明导电面板；工作时，透明导电面板响应于外部的手指感应形成电容，透明信号处理电路通过通孔对透明导电面板进行充电，并在充电结束后获取电容所存储的电压值进行输出。本发明提供的指纹识别面板及装置，减少了信号在传输的过程中的损耗，消除了线寄生电容以及耦合电容对识别出来的信号的干扰，提高了指纹识别的精度。
The invention discloses a fingerprint identification panel and a device, wherein the panel has a two-layer structure, one layer is a transparent fingerprint sensing array, and the other layer is a transparent signal processing circuit; the transparent fingerprint sensing array and the transparent signal processing circuit are arranged There is a transparent insulating film, and a through hole is arranged on the transparent insulating film, and the transparent fingerprint sensing array and the transparent signal processing circuit are connected through the through hole; the transparent fingerprint sensing array includes a plurality of transparent conductive panels; when working, the transparent conductive panel responds The capacitance is formed by the external finger induction, and the transparent signal processing circuit charges the transparent conductive panel through the through hole, and obtains the voltage value stored in the capacitor for output after the charging is completed. The fingerprint recognition panel and device provided by the present invention reduce the loss of signals during transmission, eliminate the interference of line parasitic capacitance and coupling capacitance to recognized signals, and improve the precision of fingerprint recognition.
Description
技术领域technical field
本发明涉及计算机技术领域，特别涉及一种指纹识别面板及装置。The invention relates to the field of computer technology, in particular to a fingerprint identification panel and a device.
背景技术Background technique
随着社会的进步和技术的发展，近年来，移动银行、手机钱包、网络购物等电子商务业务在智能移动设备上的应用日趋广泛。相应地，公众对于集成的电子元器件性能以及网络信息安全的要求也越来越高。指纹由于具有唯一性和稳定性而使其成为个人身份识别的一种有效手段。电容式指纹识别是目前研究的热点。电容式指纹识别基于对指纹的电容检测实现，一方面响应于指纹识别传感器中的一个或多个电容极板之间，另一方面响应于用户手指的嵴和峪(诸如用户的手指的表皮，或可能用户的手指的皮下层)之间的不同的电容度量，来提供指纹信息的集合。With the progress of society and the development of technology, in recent years, e-commerce services such as mobile banking, mobile wallet, and online shopping have been widely used on smart mobile devices. Correspondingly, the public has higher and higher requirements for the performance of integrated electronic components and network information security. Fingerprints are an effective means of personal identification due to their uniqueness and stability. Capacitive fingerprint recognition is a hot research topic at present. Capacitive fingerprint identification is realized based on the capacitance detection of fingerprints. On the one hand, it responds between one or more capacitive plates in the fingerprint identification sensor, and on the other hand, it responds to the ridges and valleys of the user's finger (such as the skin of the user's finger, or possibly the subcutaneous layer of the user's finger) to provide a collection of fingerprint information.
2013年苹果公司率先为旗下发布的新款“iPhone”智能手机添加了指纹识别的功能。自此以后各大手机厂商先后开发并应用了类似的识别技术，将指纹传感器集成到智能手机中，用于屏幕解锁以及替代传统的密码输入来进行无线支付等功能。相继华为、三星也添加了指纹识别功能。In 2013, Apple took the lead in adding fingerprint recognition to its new "iPhone" smartphone. Since then, major mobile phone manufacturers have successively developed and applied similar identification technologies, integrating fingerprint sensors into smartphones for screen unlocking and wireless payment instead of traditional password input. Huawei and Samsung have also added fingerprint recognition.
然而，目前市场上出现的若干种商用指纹识别器大多基于成熟的单晶硅或者多晶硅基CMOS工艺设计与制造，用金属构成电极与互连线，虽然成本较低，体积较小，且技术较为成熟，但是它们都有一个共同的缺陷：整个指纹识别模块无法做成透明的，不能与便携式电子设备(如智能手机或平板电脑)的透明触摸面板阵列集成。这种不透明的硅基指纹识别模块占据显示面板之外的区域，限制手机的有效显示面积，与当今智能手机大屏化、窄边化的趋势格格不入。另外，从操作体验上来看，硅基指纹识别器配置在Home键或手机背面，并不直观易用，如果是滑动扫描式的使用起来则更加不便捷；传统硅基指纹识别器扫描面积一般是5mm×5mm，所获得的指纹信息毕竟有限，从安全性来看，有一定的安全隐患。However, most of the commercial fingerprint readers currently on the market are designed and manufactured based on mature monocrystalline silicon or polycrystalline silicon-based CMOS technology, and use metal to form electrodes and interconnect lines. Although the cost is low, the volume is small, and the technology is advanced Mature, but they all have a common defect: the entire fingerprint recognition module cannot be made transparent, and cannot be integrated with a transparent touch panel array of a portable electronic device (such as a smartphone or a tablet computer). This opaque silicon-based fingerprint recognition module occupies the area outside the display panel, limiting the effective display area of the mobile phone, which is incompatible with today's trend of larger screens and narrower bezels of smartphones. In addition, from the perspective of operating experience, the silicon-based fingerprint reader is configured on the Home button or the back of the phone, which is not intuitive and easy to use. It is even more inconvenient to use if it is a sliding scanning type; 5mm×5mm, the obtained fingerprint information is limited after all, from the point of view of security, there are certain potential safety hazards.
发明内容Contents of the invention
针对现有技术的不足，本发明提供了一种集成透明指纹感测阵列和透明信号处理电路的指纹识别面板及装置，减少了信号在传输的过程中的损耗，避免了外界信号的干扰，能跟精确的识别出指纹信号。Aiming at the deficiencies of the prior art, the present invention provides a fingerprint identification panel and device integrating a transparent fingerprint sensing array and a transparent signal processing circuit, which reduces the loss of signals during transmission, avoids the interference of external signals, and can And accurately identify the fingerprint signal.
本发明提供的指纹识别面板，具有两层结构，一层为透明指纹感测阵列，另一层为透明信号处理电路；The fingerprint identification panel provided by the present invention has a two-layer structure, one layer is a transparent fingerprint sensing array, and the other layer is a transparent signal processing circuit;
所述透明指纹感测阵列和所述透明信号处理电路之间设置有透明绝缘薄膜，所述透明绝缘薄膜上设置有通孔，所述透明指纹感测阵列和所述透明信号处理电路之间通过所述通孔连接；A transparent insulating film is arranged between the transparent fingerprint sensing array and the transparent signal processing circuit, and a through hole is arranged on the transparent insulating film, and the transparent fingerprint sensing array and the transparent signal processing circuit pass through said through-hole connection;
所述透明指纹感测阵列包括多个透明导电面板；工作时，所述透明导电面板响应于外部的手指感应形成电容，所述透明信号处理电路通过所述通孔对所述透明导电面板进行充电，并在充电结束后获取所述电容所存储的电压值进行输出。The transparent fingerprint sensing array includes a plurality of transparent conductive panels; during operation, the transparent conductive panels form capacitance in response to external finger induction, and the transparent signal processing circuit charges the transparent conductive panels through the through holes , and obtain and output the voltage value stored in the capacitor after the charging is completed.
作为一种可实施方式，所述透明信号处理电路包括透明矩阵分层连线以及多个透明信号处理单元；As an implementable manner, the transparent signal processing circuit includes transparent matrix layered wiring and a plurality of transparent signal processing units;
所述透明矩阵分层连线连接透明信号处理单元和外部的扫描电路；The transparent matrix layered connection connects the transparent signal processing unit and the external scanning circuit;
工作时，扫描电路对所述透明矩阵分层连线施加脉冲扫描信号，使所述脉冲扫描信号依次传输至各个所述透明信号处理单元。When working, the scanning circuit applies a pulse scanning signal to the transparent matrix layered wiring, so that the pulse scanning signal is sequentially transmitted to each of the transparent signal processing units.
作为一种可实施方式，所述透明矩阵分层连线包括电源线、行扫描线以及列输出线。As a possible implementation manner, the transparent matrix layered wiring includes a power supply line, a row scan line, and a column output line.
作为一种可实施方式，所述透明信号处理单元包括输入控制晶体管单元、采样保持电路、运算放大电路以及模数转换电路；As a possible implementation, the transparent signal processing unit includes an input control transistor unit, a sample-and-hold circuit, an operational amplifier circuit, and an analog-to-digital conversion circuit;
所述输入控制晶体管单元，连接所述透明导电面板，用于对所述透明导电面板进行充电；The input control transistor unit is connected to the transparent conductive panel for charging the transparent conductive panel;
所述采样保持电路、运算放大电路以及模数转换电路依次连接；所述采样保持电路还连接所述透明导电面板，充电结束后，所述透明导电面板的放电信号依次经过所述采样保持电路、运算放大电路、模数转换电路输出。The sample-and-hold circuit, operational amplifier circuit, and analog-to-digital conversion circuit are sequentially connected; the sample-and-hold circuit is also connected to the transparent conductive panel, and after charging, the discharge signal of the transparent conductive panel passes through the sample-hold circuit, Operational amplifier circuit, analog-to-digital conversion circuit output.
作为一种可实施方式，所述透明导电面板和所述透明信号处理单元一一对应，通过所述通孔连接。As a possible implementation manner, the transparent conductive panel corresponds to the transparent signal processing unit one by one, and is connected through the through hole.
作为一种可实施方式，多个所述透明导电面板对应一个所述透明信号处理单元，通过所述通孔连接。As a possible implementation manner, multiple transparent conductive panels correspond to one transparent signal processing unit, and are connected through the through holes.
作为一种可实施方式，所述透明指纹感测阵列连接一透明玻璃基板。As a possible implementation manner, the transparent fingerprint sensing array is connected to a transparent glass substrate.
作为一种可实施方式，所述透明信号处理电路连接一透明玻璃基板。As a possible implementation manner, the transparent signal processing circuit is connected to a transparent glass substrate.
作为一种可实施方式，所述透明信号处理电路由薄膜晶体管搭建而成。As a possible implementation manner, the transparent signal processing circuit is constructed by thin film transistors.
相应地，本发明还提供一种指纹识别装置，包括上述指纹识别面板，还包括扫描电路、透明玻璃基板以及主控模块；Correspondingly, the present invention also provides a fingerprint identification device, which includes the above-mentioned fingerprint identification panel, and also includes a scanning circuit, a transparent glass substrate, and a main control module;
所述指纹识别面板，位于所述透明玻璃基板上，并连接所述扫描电路和主控模块；The fingerprint identification panel is located on the transparent glass substrate and connected to the scanning circuit and the main control module;
所述指纹识别面板中的透明导电面板响应于所述透明玻璃基板上的手指感应形成电容；所述主控模块控制所述扫描电路对所述指纹识别面板中的透明信号处理电路施加脉冲信号，通过所述透明信号处理电路对所述透明导电面板进行充电；在充电结束后，所述透明信号处理电路获取所述电容所存储的电压值输出至所述主控模块，所述主控模块根据所述电压值对所述手指感应进行识别。The transparent conductive panel in the fingerprint identification panel forms capacitance in response to finger induction on the transparent glass substrate; the main control module controls the scanning circuit to apply pulse signals to the transparent signal processing circuit in the fingerprint identification panel, The transparent conductive panel is charged through the transparent signal processing circuit; after the charging is completed, the transparent signal processing circuit obtains the voltage value stored in the capacitor and outputs it to the main control module, and the main control module according to The voltage value identifies the finger sensing.
本发明的有益效果是：The beneficial effects of the present invention are:
本发明提供的指纹识别面板及装置，将透明指纹感测阵列和透明信号处理电路集成为一体，其中透明指纹感测阵列在下层直接沉积在透明玻璃基板表面时，手指在透明玻璃基板的另一面触摸，就能够感应出较大的电容值，减少了耦合电容和线的寄生电容的影响，适合于玻璃较厚的应用；如果透明指纹感测阵列在上层，透明信号处理电路在下层，则增加了感应电容面板之间的间距，适合于玻璃较薄的应用。The fingerprint identification panel and device provided by the present invention integrate a transparent fingerprint sensing array and a transparent signal processing circuit, wherein when the transparent fingerprint sensing array is directly deposited on the surface of a transparent glass substrate in the lower layer, the finger is on the other side of the transparent glass substrate Touching can sense a larger capacitance value, which reduces the influence of coupling capacitance and parasitic capacitance of the line, and is suitable for applications with thicker glass; if the transparent fingerprint sensing array is on the upper layer and the transparent signal processing circuit is on the lower layer, then increase The spacing between inductive capacitive panels is improved, which is suitable for applications with thinner glass.
本发明提供的指纹识别面板及装置，针对不同的识别应用提供了不同的结构，减少了信号在传输的过程中的损耗，消除了线寄生电容以及耦合电容对识别出来的信号的干扰，提高了指纹识别的精度。The fingerprint identification panel and device provided by the present invention provide different structures for different identification applications, reduce the loss of signals in the process of transmission, eliminate the interference of line parasitic capacitance and coupling capacitance on the identified signals, and improve the efficiency of identification. Accuracy of fingerprint recognition.
附图说明Description of drawings
图1a为本发明实施例一提供的指纹识别面板的结构示意图；Fig. 1a is a schematic structural diagram of a fingerprint identification panel provided by Embodiment 1 of the present invention;
图1b为图1a所示的指纹识别面板的截面示意图；Figure 1b is a schematic cross-sectional view of the fingerprint identification panel shown in Figure 1a;
图2为本发明实施例二提供的指纹识别面板的结构示意图；FIG. 2 is a schematic structural diagram of a fingerprint identification panel provided by Embodiment 2 of the present invention;
图3a为本发明实施例三提供的指纹识别面板的结构示意图；FIG. 3a is a schematic structural diagram of a fingerprint identification panel provided by Embodiment 3 of the present invention;
图3b为图3a所示的指纹识别面板的截面示意图；Fig. 3b is a schematic cross-sectional view of the fingerprint identification panel shown in Fig. 3a;
图4为本发明实施例四提供的指纹识别面板的结构示意图；FIG. 4 is a schematic structural diagram of a fingerprint identification panel provided by Embodiment 4 of the present invention;
图5为本发明实施例五提供的指纹识别面板的结构示意图；FIG. 5 is a schematic structural diagram of a fingerprint identification panel provided by Embodiment 5 of the present invention;
图6为本发明实施例六提供的指纹识别面板的结构示意图；FIG. 6 is a schematic structural diagram of a fingerprint identification panel provided by Embodiment 6 of the present invention;
图7为本发明实施例七提供的指纹识别装置的电路原理图。FIG. 7 is a schematic circuit diagram of a fingerprint identification device provided by Embodiment 7 of the present invention.
具体实施方式detailed description
以下结合附图，对本发明上述的和另外的技术特征和优点进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明的部分实施例，而不是全部实施例。The above and other technical features and advantages of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them.
请参阅图1a和图1b，本发明实施例一提供的指纹识别面板，图示结构为直流工作模式。该面板结构包括上下两层，下面一层为透明指纹感测阵列，上面一层为透明信号处理电路。透明指纹感测阵列是由多个透明导电面板11组成的阵列，生长在透明玻璃基板10上。位于上层的透明信号处理电路包括透明矩阵分层连线以及多个透明信号处理单元12。透明指纹感测阵列和透明信号处理电路之间隔着一层透明绝缘薄膜13，通过通孔131连接。透明绝缘薄膜相当于位于上层的透明信号处理电路的基板。Please refer to FIG. 1a and FIG. 1b , the fingerprint recognition panel provided by Embodiment 1 of the present invention, the structure shown in the figure is a DC working mode. The panel structure includes upper and lower layers, the lower layer is a transparent fingerprint sensing array, and the upper layer is a transparent signal processing circuit. The transparent fingerprint sensing array is an array composed of a plurality of transparent conductive panels 11 grown on a transparent glass substrate 10 . The transparent signal processing circuit on the upper layer includes transparent matrix layered wiring and a plurality of transparent signal processing units 12 . A layer of transparent insulating film 13 is interposed between the transparent fingerprint sensing array and the transparent signal processing circuit, and is connected through a through hole 131 . The transparent insulating film corresponds to the substrate of the transparent signal processing circuit located on the upper layer.
各个透明导电面板11相互之间不连通，其长和宽小于指纹嵴和峪(指纹嵴为指纹线凸出来的部分，指纹峪为指纹线凹进去的部分)的宽度，以保证每条指纹嵴和峪(宽度300～500um)都能与透明导电面板11形成一个电容，电容的大小由透明导电面板11的面积以及透明玻璃基板10的厚度决定。为了保证识别的精度，同时减少非完全感测到的点，透明导电面板11的面积应达到足够小。透明导电面板11组成的透明指纹感测阵列的面积根据实际应用来设计(图示中为二行二列，实际列数和行数不以此为限)。Each transparent conductive panel 11 is not connected to each other, and its length and width are smaller than the width of fingerprint ridges and valleys (fingerprint ridges are the protruding parts of fingerprint lines, and fingerprint valleys are the recessed parts of fingerprint lines), so as to ensure that each fingerprint ridge Both and the valley (300-500um in width) can form a capacitor with the transparent conductive panel 11 , and the size of the capacitor is determined by the area of the transparent conductive panel 11 and the thickness of the transparent glass substrate 10 . In order to ensure the recognition accuracy and reduce the incompletely sensed points, the area of the transparent conductive panel 11 should be sufficiently small. The area of the transparent fingerprint sensing array formed by the transparent conductive panel 11 is designed according to the actual application (two rows and two columns in the figure, the actual number of columns and rows is not limited thereto).
透明矩阵分层连线包括电源线(未示出)、行扫描线14、列输出线15。透明信号处理单元12包括输入控制晶体管单元、采样保持电路、运算放大电路以及模数转换电路。输入控制晶体管单元连接透明导电面板11，对透明导电面板11进行充电；充电结束后，透明导电面板11的放电信号依次经过采样保持电路、运算放大电路、模数转换电路输出。The transparent matrix layered wiring includes a power supply line (not shown), a row scan line 14 and a column output line 15 . The transparent signal processing unit 12 includes an input control transistor unit, a sample-and-hold circuit, an operational amplifier circuit, and an analog-to-digital conversion circuit. The input control transistor unit is connected to the transparent conductive panel 11 to charge the transparent conductive panel 11; after the charging is completed, the discharge signal of the transparent conductive panel 11 is output through the sample and hold circuit, the operational amplifier circuit, and the analog-to-digital conversion circuit in sequence.
行扫描线14由多根行线构成，连接外部的扫描电路以及每行多个输入控制晶体管单元。输入控制晶体管单元由行的脉冲信号控制其打开还是关断，其另一端连接着透明导电面板11。透明信号处理单元12的输出端连接列输出线15。列输出线15根据所测信号所需的精度来确定，越高精度的信号则需要越多根列输出线15。The row scanning line 14 is composed of a plurality of row lines, and is connected to an external scanning circuit and a plurality of input control transistor units in each row. The input control transistor unit is controlled to be turned on or off by the pulse signal of the row, and its other end is connected to the transparent conductive panel 11 . The output terminal of the transparent signal processing unit 12 is connected to the column output line 15 . The column output lines 15 are determined according to the required accuracy of the measured signal, and the higher the accuracy of the signal, the more column output lines 15 are required.
上述指纹识别面板的工作方式如下：The above fingerprint recognition panel works as follows:
当手指接触到透明玻璃基板10的背面(与生长透明指纹感测阵列相对的一面)时，手指指纹嵴以及峪会与位于透明玻璃基板10另一面的透明导电面板11感应形成大小不同的电容C1和C2，由于指纹嵴与透明玻璃基板10完全接触时，指纹峪与玻璃之间未完全接触，隔着一定间距的空气，所感应出来的电容实际是透明玻璃基板10部分电容和空气部分电容的串联，导致C1和C2相差1-10倍。When a finger touches the back side of the transparent glass substrate 10 (the side opposite to the growing transparent fingerprint sensing array), the fingerprint ridges and valleys of the finger will be induced with the transparent conductive panel 11 on the other side of the transparent glass substrate 10 to form capacitance C of different sizes. 1 and C 2 , because when the fingerprint ridge is in full contact with the transparent glass substrate 10, the fingerprint ridge and the glass are not in complete contact, separated by a certain distance of air, the induced capacitance is actually part of the capacitance of the transparent glass substrate 10 and the air part The series connection of capacitors results in a difference of 1-10 times between C1 and C2 .
透明信号处理电路通过输入行线14上的脉冲信号打开输入控制晶体管单元，并对透明信号处理单元12下方的透明导电面板11进行充放电，根据感应电容的大小不同，放电出来的电荷量也不同，然后透明信号处理电路通过列输出线15将信号输出。The transparent signal processing circuit turns on the input control transistor unit by inputting the pulse signal on the row line 14, and charges and discharges the transparent conductive panel 11 under the transparent signal processing unit 12, and the amount of discharged charge is also different according to the size of the inductive capacitance , and then the transparent signal processing circuit outputs the signal through the column output line 15 .
参见图1b，透明导电面板11直接生长在透明玻璃基板10上。透明指纹感测阵列和透明信号处理电路之间隔着一层透明绝缘薄膜，通过通孔131连接。透明绝缘薄膜相当于位于上层透明信号处理电路的基板。上层可见部分为透明信号处理单元12和列输出线15。Referring to FIG. 1 b , a transparent conductive panel 11 is directly grown on a transparent glass substrate 10 . There is a layer of transparent insulating film between the transparent fingerprint sensing array and the transparent signal processing circuit, which are connected through the through hole 131 . The transparent insulating film is equivalent to the substrate of the upper transparent signal processing circuit. The visible part of the upper layer is the transparent signal processing unit 12 and the column output line 15 .
参见图2，本发明实施例二提供的指纹识别面板，与实施例一相比，上下两层的位置进行交换。下面一层位透明信号处理电路，上面一层为透明指纹感测阵列。Referring to FIG. 2 , the fingerprint identification panel provided by Embodiment 2 of the present invention is compared with Embodiment 1, and the positions of the upper and lower layers are exchanged. The lower layer is a transparent signal processing circuit, and the upper layer is a transparent fingerprint sensing array.
位于下层的透明信号处理电路由透明信号处理单元22和透明矩阵分层连线(示出了行扫描线24、列输出线25)，生长在透明玻璃基板20上，上面覆盖着一层透明绝缘薄膜23。The transparent signal processing circuit located in the lower layer is connected in layers by the transparent signal processing unit 22 and the transparent matrix (row scanning line 24 and column output line 25 are shown), grown on the transparent glass substrate 20, covered with a layer of transparent insulation film23.
位于上层的透明指纹感测阵列由多个透明导电面板21组成的阵列构成，上下两层通过通孔231连接。在该结构上再生长一层绝缘薄膜即可将手指直接放在该绝缘薄膜上进行指纹识别。如不在背面生长绝缘薄膜，手指可以在透明玻璃基板20的另一面，隔着玻璃进行指纹识别。The transparent fingerprint sensing array on the upper layer is composed of an array of multiple transparent conductive panels 21 , and the upper and lower layers are connected through through holes 231 . By growing another layer of insulating film on the structure, the finger can be directly placed on the insulating film for fingerprint recognition. If the insulating film is not grown on the back side, the finger can be on the other side of the transparent glass substrate 20 for fingerprint identification through the glass.
对于手指放在透明玻璃基板背面，实施例一和实施例二应用于不同厚度的玻璃基板，具体如下：For fingers placed on the back of the transparent glass substrate, Embodiment 1 and Embodiment 2 are applied to glass substrates of different thicknesses, as follows:
实施例一中，透明指纹感测阵列在下层，直接沉积在玻璃基板表面时，手指在玻璃基板的另一面感应出较大的电容值，并减少了耦合电容和线的寄生电容的影响，适合于玻璃基板较厚的应用。In Embodiment 1, when the transparent fingerprint sensing array is deposited directly on the surface of the glass substrate in the lower layer, a larger capacitance value is induced by the finger on the other side of the glass substrate, and the influence of the coupling capacitance and the parasitic capacitance of the line is reduced, which is suitable for For applications with thicker glass substrates.
实施例二中，透明指纹感测阵列在上层，透明信号处理电路在下层，增加了感应电容面板之间的间距，适合于玻璃基板较薄的应用。In the second embodiment, the transparent fingerprint sensing array is on the upper layer, and the transparent signal processing circuit is on the lower layer, which increases the distance between the inductive capacitive panels and is suitable for applications with thinner glass substrates.
对于在双层结构之上再生长一层绝缘薄膜，手指直接放在薄膜上进行指纹识别，适用于实施例二提供的指纹识别面板。该识别方式由于手指感应形成的电容的距离可根据实际生长的绝缘薄膜厚度控制，而且绝缘薄膜比玻璃基板薄1-4个数量级，使得感应形成的电容较大，对透明信号处理电路的要求就会相应降低，提高了透明指纹识别的质量。For growing a layer of insulating film on the double-layer structure, the finger is directly placed on the film for fingerprint recognition, which is suitable for the fingerprint recognition panel provided in the second embodiment. In this identification method, the distance of the capacitance formed by finger induction can be controlled according to the thickness of the actually grown insulating film, and the insulating film is 1-4 orders of magnitude thinner than the glass substrate, so that the capacitance formed by induction is relatively large, and the requirements for transparent signal processing circuits are just will decrease accordingly, improving the quality of transparent fingerprint recognition.
参见图3a和图3b，本发明实施例三提供的指纹识别面板，图示结构为交流工作模式。该面板结构包括上下两层，下面一层为透明指纹感测阵列，上面一层为透明信号处理电路。透明指纹感测阵列和透明信号处理电路之间隔着一层透明绝缘薄膜33，通过通孔331连接。透明绝缘薄膜33相当于上层透明信号处理电路的基板。Referring to Fig. 3a and Fig. 3b, the structure of the fingerprint recognition panel provided by Embodiment 3 of the present invention is an AC working mode. The panel structure includes upper and lower layers, the lower layer is a transparent fingerprint sensing array, and the upper layer is a transparent signal processing circuit. There is a layer of transparent insulating film 33 between the transparent fingerprint sensing array and the transparent signal processing circuit, which are connected through a through hole 331 . The transparent insulating film 33 corresponds to the substrate of the upper transparent signal processing circuit.
与实施例一相比，位于下层的透明指纹感测阵列设置在透明玻璃基板30上，其中的透明导电面板31面积相对变小，同时，数量对应增加。位于上层的透明信号处理电路包括透明信号处理单元32以及透明矩阵分层连线(示出了行扫描线34、列输出线35)。行扫描线34由多根行线构成，连接外部的扫描电路以及每行多个输入控制晶体管单元。每个透明信号处理单元32通过两个通孔331与两个透明导电面板31连接。透明信号处理单元32通过通孔331给一个透明导电面板31施加交流信号，交流信号通过感应电容传输到电容的另一个极板，再传输回对应相邻的另一个透明导电面板31，再将传回的交流信号通过通孔33传回透明信号处理单元32，经过信号处理再通过列输出线35输出。Compared with Embodiment 1, the transparent fingerprint sensing array located on the lower layer is disposed on the transparent glass substrate 30 , and the area of the transparent conductive panels 31 is relatively smaller, and at the same time, the number is correspondingly increased. The transparent signal processing circuit on the upper layer includes a transparent signal processing unit 32 and transparent matrix layered wiring (row scanning line 34 and column output line 35 are shown). The row scanning line 34 is composed of a plurality of row lines, and is connected to an external scanning circuit and a plurality of input control transistor units in each row. Each transparent signal processing unit 32 is connected to two transparent conductive panels 31 through two through holes 331 . The transparent signal processing unit 32 applies an AC signal to a transparent conductive panel 31 through the through hole 331, and the AC signal is transmitted to the other plate of the capacitor through the inductive capacitor, and then transmitted back to another corresponding adjacent transparent conductive panel 31, and then the transmitted The returned AC signal is transmitted back to the transparent signal processing unit 32 through the through hole 33 , and then output through the column output line 35 after signal processing.
如图3b所示，每一个透明信号处理单元32对应两个透明导电面板31，上层可见部分为透明信号处理单元32和列输出线35。As shown in FIG. 3 b , each transparent signal processing unit 32 corresponds to two transparent conductive panels 31 , and the visible part of the upper layer is the transparent signal processing unit 32 and the column output lines 35 .
参见图4，本发明实施例四提供的指纹识别面板，与实施例三相比，上下两层的位置进行交换。下面一层透明信号处理电路，包括透明信号处理单元42以及透明矩阵分层连线(示出了行扫描线44、列输出线45)。透明信号处理电路生长在透明玻璃基40上，上面覆盖着一层透明绝缘薄膜43。上面一层为由多个透明导电面板41组成的透明指纹感测阵列，上下两层通过通孔431连接。在该结构上再生长一层绝缘薄膜即可将手指直接放在该绝缘薄膜上进行指纹识别。如不在背面生长绝缘薄膜，手指可以在透明玻璃基板40的另一面，隔着透明玻璃基板40进行指纹识别。Referring to FIG. 4 , the fingerprint identification panel provided by Embodiment 4 of the present invention is compared with Embodiment 3, the positions of the upper and lower layers are exchanged. The lower layer of transparent signal processing circuit includes a transparent signal processing unit 42 and transparent matrix layered wiring (row scanning line 44 and column output line 45 are shown). The transparent signal processing circuit is grown on a transparent glass substrate 40 covered with a layer of transparent insulating film 43 . The upper layer is a transparent fingerprint sensing array composed of multiple transparent conductive panels 41 , and the upper and lower layers are connected through through holes 431 . By growing another layer of insulating film on the structure, the finger can be directly placed on the insulating film for fingerprint recognition. If the insulating film is not grown on the back side, the finger can perform fingerprint recognition on the other side of the transparent glass substrate 40 through the transparent glass substrate 40 .
参见图5，本发明实施例五提供的指纹识别面板，包括上下两层，下面一层为透明指纹感测阵列，上面一层为透明信号处理电路。透明指纹感测阵列是由多个透明导电面板51组成的阵列，生长在透明玻璃基板58上。与实施例一相比，下面一层的透明导电面板51的面积不变，同时数量也不变。位于上层的透明信号处理电路包含透明信号处理单元52、行扫描线54、列输出线55、输入控制晶体管单元56以及输出列线单元57。行扫描线由多根行线构成，连接扫描电路以及每行多个输入控制晶体管单元56。Referring to FIG. 5 , the fingerprint identification panel provided by Embodiment 5 of the present invention includes upper and lower layers, the lower layer is a transparent fingerprint sensing array, and the upper layer is a transparent signal processing circuit. The transparent fingerprint sensing array is an array composed of a plurality of transparent conductive panels 51 grown on a transparent glass substrate 58 . Compared with Embodiment 1, the area and quantity of the transparent conductive panels 51 on the lower layer remain unchanged. The transparent signal processing circuit on the upper layer includes a transparent signal processing unit 52 , a row scan line 54 , a column output line 55 , an input control transistor unit 56 and an output column line unit 57 . The row scanning line is composed of a plurality of row lines, connected to the scanning circuit and a plurality of input control transistor units 56 in each row.
实施例五与实施例一的区别点在于，实施例五提供的指纹识别面板中，多个透明导电面板51对应一个透明信号处理单元52。具体如图5所示，每个透明信号处理单元52通过四个通孔53与四个透明导电面板51连接(具体数量可根据信号处理电路的设计变化)。透明信号处理电路通过输入行扫描线54上的脉冲信号打开输入控制晶体管单元，并对透明信号处理单元52下方的四个透明导电面板51同时进行充放电，经过对四个放电信号的处理，然后透明信号处理电路将四个信号按顺序轮流输出到列输出线55上。The difference between the fifth embodiment and the first embodiment is that in the fingerprint identification panel provided by the fifth embodiment, a plurality of transparent conductive panels 51 correspond to one transparent signal processing unit 52 . Specifically as shown in FIG. 5 , each transparent signal processing unit 52 is connected to four transparent conductive panels 51 through four through holes 53 (the specific number may vary according to the design of the signal processing circuit). The transparent signal processing circuit turns on the input control transistor unit by inputting the pulse signal on the row scanning line 54, and simultaneously charges and discharges the four transparent conductive panels 51 below the transparent signal processing unit 52, after processing the four discharge signals, and then The transparent signal processing circuit outputs the four signals to the column output line 55 sequentially.
参见图6，本发明实施例六提供的指纹识别面板，与实施例五相比，上下两层的位置进行了交换。上面一层为透明指纹感测阵列，下面一层为透明信号处理电路。透明指纹感测阵列由多个透明导电面板61组成。透明信号处理电路由透明信号处理单元62以及透明矩阵分层连线(示出了行扫描线44、列输出线45)构成，生长在透明玻璃基板60上，上面覆盖着一层透明绝缘薄膜63。四个透明导电面板61通过四个通孔631与一个透明信号处理单元62连接。在该结构上再生长一层绝缘薄膜即可将手指直接放在该绝缘薄膜上进行指纹识别。如不在背面生长绝缘薄膜，手指可以在透明玻璃基板30的另一面，隔着透明玻璃基板60进行指纹识别。Referring to FIG. 6 , the fingerprint identification panel provided by Embodiment 6 of the present invention is compared with Embodiment 5, the positions of the upper and lower layers are exchanged. The upper layer is a transparent fingerprint sensing array, and the lower layer is a transparent signal processing circuit. The transparent fingerprint sensing array is composed of a plurality of transparent conductive panels 61 . The transparent signal processing circuit is composed of a transparent signal processing unit 62 and a transparent matrix layered wiring (row scanning line 44 and column output line 45 are shown), grown on a transparent glass substrate 60 and covered with a layer of transparent insulating film 63 . Four transparent conductive panels 61 are connected to one transparent signal processing unit 62 through four through holes 631 . By growing another layer of insulating film on the structure, the finger can be directly placed on the insulating film for fingerprint recognition. If the insulating film is not grown on the back side, the finger can perform fingerprint identification on the other side of the transparent glass substrate 30 through the transparent glass substrate 60 .
上述实施例一至六中的指纹识别面板，通过扫描电路对矩阵分层连线施加脉冲扫描信号，信号依次传输到各个透明信号处理单元，通过分划多层结构以保障线路之间的连通，减小寄生电容。In the fingerprint identification panel in the above-mentioned embodiments 1 to 6, the pulse scanning signal is applied to the matrix layered connection through the scanning circuit, and the signal is transmitted to each transparent signal processing unit in turn, and the connection between the lines is guaranteed by dividing the multi-layer structure, reducing the Small parasitic capacitance.
根据识别精度的要求以及性能，透明导电面板和透明信号处理单元可一一对应通过多个通孔进行连接，也可多个透明导电面板对应一个透明信号处理单元。如只需要进行触控识别，只需将透明导电面板的面积做大即可。According to the requirements of recognition accuracy and performance, the transparent conductive panel and the transparent signal processing unit can be connected through a plurality of through holes in one-to-one correspondence, or multiple transparent conductive panels can correspond to a transparent signal processing unit. If only touch recognition is required, it is only necessary to enlarge the area of the transparent conductive panel.
基于同一发明构思，本发明实施例还提供了一种指纹识别装置，该装置的工作原理与上述指纹识别面板的工作原理相同，重复之处不再冗述。Based on the same inventive concept, the embodiment of the present invention also provides a fingerprint recognition device, the working principle of the device is the same as that of the above-mentioned fingerprint recognition panel, and the repetition will not be repeated.
本发明实施例七提供的指纹识别装置，包括上述实施例中的指纹识别面板，还包括扫描电路、透明玻璃基板以及主控模块，指纹识别面板位于透明玻璃基板上，并连接扫描电路和主控模块。The fingerprint identification device provided by Embodiment 7 of the present invention includes the fingerprint identification panel in the above embodiment, and also includes a scanning circuit, a transparent glass substrate, and a main control module. The fingerprint identification panel is located on the transparent glass substrate and is connected to the scanning circuit and the main control module. module.
指纹识别面板中的透明导电面板响应于透明玻璃基板上的手指感应形成电容；主控模块控制扫描电路对指纹识别面板中的透明信号处理电路施加脉冲信号，通过透明信号处理电路对透明导电面板进行充电；在充电结束后，透明信号处理电路获取电容所存储的电压值输出至主控模块，主控模块根据电压值对手指感应进行识别。The transparent conductive panel in the fingerprint identification panel responds to the finger induction on the transparent glass substrate to form a capacitance; the main control module controls the scanning circuit to apply a pulse signal to the transparent signal processing circuit in the fingerprint identification panel, and the transparent conductive panel is processed by the transparent signal processing circuit. Charging; after the charging is completed, the transparent signal processing circuit obtains the voltage value stored in the capacitor and outputs it to the main control module, and the main control module recognizes the finger induction according to the voltage value.
具体地，作为一种可实施方式，如图7所示，主控模块70控制扫描电路71，通过多根行扫描线对透明信号处理电路逐行施加脉冲信号，脉冲信号向电容极板72(即透明导电面板)进行充电；充电完成后，电容进行放电，放电信号经过采样保持电路73，再经过运算放大电路74，然后通过模数转换电路75，最后通过列输出线输出给主控模块70。Specifically, as a possible implementation, as shown in FIG. 7 , the main control module 70 controls the scanning circuit 71 to apply pulse signals to the transparent signal processing circuit row by row through a plurality of row scanning lines, and the pulse signals are sent to the capacitor plate 72 ( That is, the transparent conductive panel) is charged; after the charging is completed, the capacitor is discharged, and the discharge signal passes through the sample and hold circuit 73, then through the operational amplifier circuit 74, then through the analog-to-digital conversion circuit 75, and finally output to the main control module 70 through the column output line .
本发明实施例提供的指纹识别面板及装置的空间结构和识别形式，简化了外围电路，提高了识别的精度，消除了线寄生电容以及耦合电容对识别出来的信号的干扰，并针对不同的识别应用提供了不同的结构模型。The spatial structure and identification form of the fingerprint identification panel and device provided by the embodiment of the present invention simplifies the peripheral circuit, improves the accuracy of identification, eliminates the interference of line parasitic capacitance and coupling capacitance on the identified signal, and is aimed at different identification The application provides different structural models.
本发明实施例提供的指纹识别面板具有透明指纹感测阵列和透明信号处理电路上下两层的结构，对应不同的设计应用。其中透明指纹感测阵列在下层直接沉积在透明玻璃基板表面时，手指在透明玻璃基板的另一面触摸，就能够感应出较大的电容值，减少了耦合电容和线的寄生电容的影响，适合于玻璃较厚的应用。如果透明指纹感测阵列在上层，透明信号处理电路在下层，则增加了感应电容面板之间的间距，适合于玻璃较薄的应用。透明信号处理电路相对于透明指纹感测阵列的面板层数多，厚度更厚。The fingerprint identification panel provided by the embodiment of the present invention has a structure of upper and lower layers of a transparent fingerprint sensing array and a transparent signal processing circuit, corresponding to different design applications. Among them, when the transparent fingerprint sensing array is directly deposited on the surface of the transparent glass substrate in the lower layer, a finger touches the other side of the transparent glass substrate to sense a larger capacitance value, reducing the influence of coupling capacitance and parasitic capacitance of the line, suitable for For thicker glass applications. If the transparent fingerprint sensing array is on the upper layer and the transparent signal processing circuit is on the lower layer, the distance between the sensing capacitive panels is increased, which is suitable for applications with thinner glass. Compared with the transparent fingerprint sensing array, the transparent signal processing circuit has more panel layers and is thicker.
需要特别说明的是，本发明实施例提供的指纹识别面板，将透明指纹感测阵列和透明信号处理电路片集成在一个片上，片上所有的电路单元均基于透明薄膜晶体管实现，通过薄膜沉积得到。It should be noted that the fingerprint identification panel provided by the embodiment of the present invention integrates a transparent fingerprint sensing array and a transparent signal processing circuit chip on one chip, and all circuit units on the chip are implemented based on transparent thin film transistors and obtained by thin film deposition.
本发明通过将透明信号处理电路直接与透明指纹感测阵列集成在一起，减少了信号在传输的过程中的损耗，避免了外界信号的干扰，能更精确的识别出指纹信号。By directly integrating the transparent signal processing circuit with the transparent fingerprint sensing array, the present invention reduces signal loss during transmission, avoids interference from external signals, and can identify fingerprint signals more accurately.
以上所述的具体实施例，对本发明的目的、技术方案和有益效果进行了进一步的详细说明，应当理解，以上所述仅为本发明的具体实施例而已，并不用于限定本发明的保护范围。特别指出，对于本领域技术人员来说，凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the protection scope of the present invention. . In particular, for those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.
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