WO2017001993A1 - 降低寄生电容的指纹辨识传感器 - Google Patents
降低寄生电容的指纹辨识传感器 Download PDFInfo
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- WO2017001993A1 WO2017001993A1 PCT/IB2016/053812 IB2016053812W WO2017001993A1 WO 2017001993 A1 WO2017001993 A1 WO 2017001993A1 IB 2016053812 W IB2016053812 W IB 2016053812W WO 2017001993 A1 WO2017001993 A1 WO 2017001993A1
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- conductive plate
- parasitic capacitance
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- 230000003071 parasitic effect Effects 0.000 title claims abstract description 35
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims description 26
- 239000000758 substrate Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 15
- 239000002184 metal Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001815 facial effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
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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 present application relates to a fingerprint identification sensor, and more particularly to a fingerprint recognition sensor for reducing parasitic capacitance.
- the sensing electrodes form an array to define a a sensing area
- the capacitive sensing layer covers the sensing electrodes
- the finger sensing metal layer is disposed on the capacitive sensing layer and has a plurality of fishbone structures
- the common conductive layer connecting the fishbone structures and Surrounding the sensing area for transmitting a signal
- the signal processing circuit is disposed under the electrical sensing electrode and electrically connected thereto
- the insulating layer is disposed between the sensing electrodes and the signal processing circuit
- the protection A layer covers the capacitive sensing layer and the finger sensing metal layer.
- the above patent application is a capacitor generated by a finger approaching or contacting the finger to sense the metal layer, and the capacitor sensing layer is used to detect the capacitor to activate a fingerprint sensing integrated circuit.
- parasitic capacitance or stray capacitance
- parasitic capacitance or stray capacitance
- the capacitor interferes with the originally designed and functional capacitor, which affects the function and characteristics of the capacitor, resulting in inconvenience in use. Summary of the invention
- the main purpose of the present application is to solve the problem that the existing fingerprint identification sensor interferes with the sensing capacitance due to the generation of parasitic capacitance and affects fingerprint identification.
- the present application provides a fingerprint identification sensor for reducing parasitic capacitance, comprising a detecting conductive plate, a first conductive plate, a second conductive plate and a voltage compensating element, wherein the detecting conductive plate is in contact with a finger. Detecting a fingerprint, the first conductive plate is located on a side of the detecting conductive plate away from the finger, and forms a detecting capacitor with the detecting conductive plate, wherein the second conductive plate is located at the first conductive plate away from the detecting conductive plate.
- the compensation voltage is provided to the first conductive plate and the second conductive plate by the voltage compensating component to reduce the parasitic capacitance, thereby preventing the parasitic capacitance from interfering with the detecting capacitance, so that the detecting capacitor is normal.
- FIG. 1 is a schematic structural diagram of a circuit according to an embodiment of the present application.
- Figure 2 is an equivalent circuit diagram of Figure 1.
- the fingerprint identification sensor of the capacitor comprises a detecting conductive plate 10, a first conductive plate 20, a second conductive plate 30, a substrate 40 and a voltage compensating element 50.
- the detecting conductive plate 10 is in contact with a finger 60 to detect a a fingerprint
- the first conductive plate 20 is located on a side of the detecting conductive plate 10 away from the finger 60.
- the detecting conductive plate 10 and the first conductive plate 20 are A detection capacitor C s is formed therebetween, and the detection capacitor is functionally designed to detect and recognize a grain state on the fingerprint.
- the second conductive plate 30 is located on the side of the first conductive plate 20 away from the detecting conductive plate 10, and when the detecting capacitor is formed, a parasitic between the first conductive plate 20 and the second conductive plate 30 is formed.
- capacitance C p (or called stray capacitance), the parasitic capacitance C p occurs in the system in an unexpected form capacitive circuit elements being too close to each other is formed, the parasitic capacitance c p disturb the detection capacitor C S, and further The function and the characteristic of the detecting capacitor are affected, so that it is necessary to be excluded; the two ends of the voltage compensating element 50 are respectively connected to the first conductive plate 20 and the second conductive plate 30, and dynamically according to the first conductive plate 20 a reference voltage provides a compensation voltage to the second conductive plate 30 to reduce the influence of the parasitic capacitance C p on the detection capacitance.
- the voltage compensation component 50 can be any voltage that can provide the compensation voltage.
- An active driving component such as a buffer, an operational amplifier (OP) or a source follower, etc.
- OP operational amplifier
- the reference voltage of the first conductive plate 20 is a value that varies with time, and "dynamically" means that the voltage compensating element 50 is always corresponding to the change of the reference voltage, and the corresponding output is Compensating the voltage to the second conductive plate 30.
- the compensation voltage is close to the reference voltage, for example, having a difference value of less than 15% therebetween, and in another example, The compensation voltage is equal to the reference voltage.
- the aforementioned 15% is merely an example, and the application is not limited to this example.
- the voltage compensating component 50 is configured to use the buffer, and the voltage compensating component 50 includes an input terminal electrically connected to the first conductive plate 20, and is electrically connected to the second conductive plate 30. The output terminal, a first power terminal electrically connected to a first voltage VCC, and a second power terminal electrically connected to the substrate 40.
- the first conductive plate 20 and the second conductive plate 30 are disposed between the detecting conductive plate 10 and the substrate 40 as an example, but in other embodiments, the detecting conductive plate 10 and the conductive substrate may also be provided between the plate structure more layers 40, 50 and the compensating element is electrically connected to the voltage reference is the parasitic capacitance C p and the output of the position of the parasitic capacitance C p is equal to the voltage, The efficacy of this application can be achieved.
- the fingerprint recognition sensor may further include a first switch SW1, a second switch SW2, a third switch SW3, and a charging capacitor C.
- the first switch SW1 is electrically connected to an external voltage VDD, and the other end is electrically connected to the charging capacitor C.
- the second switch SW2, the first switch SW1 controls whether the external voltage VDD is to the charging capacitor C. Charge it.
- One end of the second switch SW2 is electrically connected to the first switch SW1 and the charging capacitor C.
- the second switch SW2 whether or not the charge sharing control system (Charge sharing) the detector capacitance C s
- the third switch The SW3 is electrically connected between the first conductive plate 20 and the ground to control whether to remove the charge.
- the detecting capacitor C s is formed between the detecting conductive plate 10 and the first conductive plate 20, and the detecting capacitor C
- the parasitic capacitance C p is induced between the first conductive plate 20 and the second conductive plate 30.
- the voltage compensating component 50 actively supplies the compensation voltage to the second conductive plate 30 to reduce
- the parasitic capacitance C p further eliminates the influence of the parasitic capacitance C p on the detection capacitance ( ⁇ , and the function of avoiding the function of the detection capacitance Cs by the parasitic capacitance C p .
- the voltage compensation component actively supplies the compensation voltage to the first conductive plate and the second conductive plate to reduce the parasitic capacitance, thereby achieving the effect of preventing the parasitic capacitance from affecting the detection capacitance.
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- Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Image Input (AREA)
Abstract
摘要本发明提供一种降低寄生电容的指纹辨识传感器,包含一检测导电板、一第一导电板、一第二导电板以及一电压补偿元件,该检测导电板与一手指接触以检测一指纹,该第一导电板位于该检测导电板远离该手指一侧,并与该检测导电板之间形成一检测电容,该第二导电板位于该第一导电板远离该检测导电板一侧,并与该第一导电板之间形成一寄生电容,该电压补偿元件的二端分别连接于该第一导电板和该第二导电板,并动态地根据该第一导电板的一参考电压提供一补偿电压于该第二导电板,以降低该寄生电容对该检测电容的干扰及影响。
Description
降低寄生电容的指纹辨识传感器
技术领域
本申请为有关一种指纹辨识传感器, 尤指一种降低寄生电容的指纹辨识 传感器。 背景技术
传统进行身份辨识的方式有许多种, 例如以设定密码、 证件辨认 (相片或 证号等)及签名等方式进行确认, 然而随着电子科技的快速发展与演进, 近年 来, 以不易被仿效及伪造且具有专一性的个人生物特征, 作为身份辨识的辨 识特征, 逐渐受到青睐并蓬勃发展。
常见的以个人生物特征进行辨识的方法, 例如脸部轮廓辨识、 虹膜辨识 及指纹辨识等, 其中又以指纹辨识的独特性、 方便性与专一性最高, 而快速 发展并广泛地使用。 现有的有关指纹辨识的相关技术如中华民国发明公开专 利第 201447711号的 "电容式指纹感测集成电路的手指感测结构"所示, 其 揭露一种电容式指纹集成电路的手指感测结构, 包含复数个感测电极、 一电 容感应层、 一手指感测金属层、 一共同导电层、 一信号处理电路、 一绝缘层 以及一保护层, 该些感测电极形成一阵列用以界定一感测区, 该电容感应层 覆盖于该些感测电极, 该手指感测金属层设置于该电容感应层上并具有复数 个鱼骨状结构, 该共同导电层连接该些鱼骨状结构并环绕该感测区用以将信 号传出, 该信号处理电路设置于该些感测电极下方并与其电性连接, 该绝缘 层设置于该些感测电极与该信号处理电路之间, 该保护层覆盖该电容感应层 与该手指感测金属层。
由此可见, 上述专利申请案系通过一手指接近或接触该手指感测金属层 时所产生的一电容, 并利用该电容感应层检测该电容以启动一指纹感测集成 电路。 然而, 在电子电路中, 除了原本通过设计产生的该电容外, 在其他电 子元件之间, 将因彼此距离靠近而产生并非原始设计或原先预期的寄生电容 (或称杂散电容),该寄生电容会干扰原先设计且具有功能性的该电容,而影响 该电容的功能及特性, 造成使用上的不便。
发明内容
本申请的主要目的, 在于解决现有指纹辨识传感器中, 因寄生电容的产 生而干扰感测电容, 影响指纹辨识的问题。
为达上述目的, 本申请提供一种降低寄生电容的指纹辨识传感器, 包含 一检测导电板、 一第一导电板、 一第二导电板以及一电压补偿元件, 该检测 导电板与一手指接触以检测一指纹, 该第一导电板位于该检测导电板远离该 手指一侧, 并与该检测导电板之间形成一检测电容, 该第二导电板位于该第 一导电板远离该检测导电板一侧, 并与该第一导电板之间形成一寄生电容, 该电压补偿元件分别电性连接于该第一导电板与该第二导电板, 并动态地根 据该第一导电板的一参考电压提供一补偿电压于该第二导电板, 以降低该寄 生电容。
如上所述, 通过该电压补偿元件提供该补偿电压于该第一导电板与该第 二导电板, 以降低该寄生电容, 借此达到防止该寄生电容干扰该检测电容, 使该检测电容得以正常运作的功效。 附图说明
图 1为本申请一实施例的电路结构示意图。
图 2为图 1的等效电路图。
附图标记说明:
10: 检测导电板;
20: 第一导电板;
30: 第二导电板;
40: 基板;
50: 电压补偿元件;
60: 手指;
SW1 : 第一开关;
SW2: 第二开关;
SW3: 第三开关;
C0: 充电电容;
Cp: 寄生电容。 具体实施方式
有关本申请的详细说明及技术内容, 现就配合图式说明如下, 请参阅图 1 及图 2所示, 为本申请一实施例的电路示意图, 如图所示, 本申请为一种降低 寄生电容的指纹辨识传感器, 包含一检测导电板 10、 一第一导电板 20、 一第 二导电板 30、 一基板 40以及一电压补偿元件 50, 该检测导电板 10与一手指 60 接触以检测一指纹,该第一导电板 20位于该检测导电板 10远离该手指 60—侧, 当该手指 60接近或接触该检测导电板 10时, 将于该检测导电板 10与该第一导 电板 20之间形成一检测电容 Cs, 该检测电容 (^系有功能性地被设计用来检测 及辨识该指纹上的一纹路状态。
该第二导电板 30位于该第一导电板 20远离该检测导电板 10—侧, 当该检 测电容 (^形成后, 便于该第一导电板 20与该第二导电板 30之间形成一寄生电 容 Cp (或称杂散电容),该寄生电容 Cp系发生于电路元件因彼此过于靠近所形成 的一种非预期的电容形式, 该寄生电容 cp会干扰该检测电容 cs, 进而影响该 检测电容 的功能与特性, 故有排除的必要; 该电压补偿元件 50的两端分别 连接于该第一导电板 20和该第二导电板 30, 并动态地根据该第一导电板 20的 一参考电压提供一补偿电压至该第二导电板 30, 以降低该寄生电容 Cp对该检 测电容 (^的影响, 举例来说, 该电压补偿元件 50可为任何可提供该补偿电压 的一主动式驱动元件, 例如一缓冲器 (Buffer)、 一运算放大器 (Operational amplifier, 简称 OP)或一源极跟随器 (Source follower)等, 以上仅为举例说明, 本申请并不限于此。 在本申请中, 该第一导电板 20的该参考电压系一随时间 变动的值, 而 "动态地"是指该电压补偿元件 50时时刻刻根据该参考电压的 变动, 而输出相对应的该补偿电压至该第二导电板 30。 在本申请的一实施例 中, 该补偿电压相近于该参考电压, 例如两者之间具有一小于 15%的差异值, 而在另一实例中, 该补偿电压是等于该参考电压。 前述的 15% 仅为举例, 本 申请并不限于此例。
在本实施例中, 该电压补偿元件 50是采用该缓冲器, 该电压补偿元件 50 包括一与该第一导电板 20电性连接的输入端、 一与该第二导电板 30电性连接
的输出端、 一与一第一电压 VCC电性连接的第一电源端以及一与该基板 40电 性连接的第二电源端。 此外, 本实施例是以该检测导电板 10和该基材 40之间 设置该第一导电板 20和该第二导电板 30作为举例说明, 然在其他实施例中, 该检测导电板 10和该基材 40之间也可设置更多层的导电板结构, 而将该电压 补偿元件 50电性连接于可参考该寄生电容 Cp而输出之与该寄生电容 Cp相等的 电压的位置, 即可达成本申请的功效。
在一实施例中, 该指纹辨识传感器还可包含一第一开关 SW1、 一第二开 关 SW2、 一第三开关 SW3以及一充电电容 C。, 该第一开关 SWl的一端电性连 接于一外部电压 VDD, 另一端电性连接于该充电电容 C。和该第二开关 SW2, 该第一开关 SW1控制该外部电压 VDD是否对该充电电容 C。进行充电。 该第二 开关 SW2的一端电性连接于该第一开关 SW1和该充电电容 C。, 另一端电性连 接于该第一导电板 20和该电压补偿元件 50的该输出端, 该第二开关 SW2系控 制是否对该检测电容 Cs进行电荷分享 (Charge sharing),该第三开关 SW3则电性 连接于该第一导电板 20和接地之间, 用以控制是否清除电荷 (Reset)。
进一歩说明如下, 当该手指 60接触该检测导电板 10以对该指纹进行辨识 时, 将在该检测导电板 10与该第一导电板 20之间形成该检测电容 Cs, 该检测 电容 Cs进而诱导该寄生电容 Cp于该第一导电板 20与该第二导电板 30之间形 成, 此时, 该电压补偿元件 50主动地提供该补偿电压于该第二导电板 30, 以 降低该寄生电容 Cp, 进而消除该寄生电容 Cp对该检测电容 (^的影响, 达到避 免该寄生电容 Cp影响该检测电容 Cs的功能之功效。
综上所述, 通过该电压补偿元件主动地提供该补偿电压于该第一导电板 与该第二导电板, 以降低该寄生电容, 进而达到避免该寄生电容影响该检测 电容的功效。
以上已将本申请做一详细说明, 惟以上所述者, 仅为本申请的一较佳实 施例, 凡依本申请申请范围所作的均等变化与修饰等, 皆应仍属本申请的专 利涵盖范围内。
Claims
1、 一种降低寄生电容的指纹辨识传感器, 其特征在于, 包含: 一与一手指接触以检测一指纹的检测导电板;
一位于该检测导电板远离该手指一侧的第一导电板, 该检测导电板与该 第一导电板之间形成一检测电容;
一位于该第一导电板远离该检测导电板一侧的第二导电板, 该第一导电 板与该第二导电板之间形成一寄生电容; 以及
一分别电性连接于该第一导电板和该第二导电板的电压补偿元件, 该电 压补偿元件动态地根据该第一导电板的一参考电压提供一补偿电压至该第二 导电板以降低该寄生电容。
2、根据权利要求 1所述的降低寄生电容的指纹辨识传感器, 其中该电压 补偿元件择自于一缓冲器、 一运算放大器及一源极跟随器所组成的群组。
3、根据权利要求 1所述的降低寄生电容的指纹辨识传感器, 其中该电压 补偿元件包括一与该第一导电板电性连接的输入端、 一与该第二导电板电性 连接的输出端、 一与一第一电压电性连接的第一电源端以及一与该基板电性 连接的第二电源端。
4、根据权利要求 3所述的降低寄生电容的指纹辨识传感器, 其中还包含 一第一开关、 一第二开关以及一充电电容, 该第二开关的一端电性连接于该 第一导电板和该电压补偿元件的该输入端, 另一端电性连接于该第一开关和 该充电电容, 该第一开关的一端电性连接于一第二电压, 另一端电性连接于 该充电电容和该第二开关。
5、根据权利要求 4所述的降低寄生电容的指纹辨识传感器, 其中还包括 一电性连接于该第一导电板和接地之间的第三开关。
6、根据权利要求 1所述的降低寄生电容的指纹辨识传感器, 其中该补偿 电压相等于该参考电压。
7、根据权利要求 1所述的降低寄生电容的指纹辨识传感器, 其中该补偿 电压和该参考电压之间具有一小于 15%的差异值。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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TW104210419U TWM516193U (zh) | 2015-06-29 | 2015-06-29 | 降低寄生電容之指紋辨識感測器 |
TW104210419 | 2015-06-29 |
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WO2017001993A1 true WO2017001993A1 (zh) | 2017-01-05 |
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PCT/IB2016/053812 WO2017001993A1 (zh) | 2015-06-29 | 2016-06-27 | 降低寄生电容的指纹辨识传感器 |
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WO (1) | WO2017001993A1 (zh) |
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CN107545219A (zh) | 2016-06-29 | 2018-01-05 | 中华映管股份有限公司 | 电容式指纹传感器及其感测面板 |
US20180025197A1 (en) * | 2016-07-20 | 2018-01-25 | Image Match Design Inc. | Sensing element and fingerprint sensor comprising the sensing elements |
KR102009260B1 (ko) | 2016-08-24 | 2019-08-09 | 선전 구딕스 테크놀로지 컴퍼니, 리미티드 | 용량 결정 회로 및 지문 인식 시스템 |
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CN101882037B (zh) * | 2009-11-02 | 2011-11-23 | 友达光电股份有限公司 | 电容式位置侦测器及其中的感应电容侦测器 |
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TWM516930U (zh) * | 2015-10-28 | 2016-02-11 | song-shan Zhangjian | 果汁機刀具固定結構 |
CN205121586U (zh) * | 2015-11-04 | 2016-03-30 | 圆台科技有限公司 | 降低寄生电容的指纹辨识感测器 |
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2015
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- 2016-06-27 WO PCT/IB2016/053812 patent/WO2017001993A1/zh active Application Filing
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CN1920851A (zh) * | 2005-08-05 | 2007-02-28 | 奇景光电股份有限公司 | 一种指纹感测装置及其方法 |
CN101882037B (zh) * | 2009-11-02 | 2011-11-23 | 友达光电股份有限公司 | 电容式位置侦测器及其中的感应电容侦测器 |
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TWM516930U (zh) * | 2015-10-28 | 2016-02-11 | song-shan Zhangjian | 果汁機刀具固定結構 |
CN205121586U (zh) * | 2015-11-04 | 2016-03-30 | 圆台科技有限公司 | 降低寄生电容的指纹辨识感测器 |
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