Fingerprint sensor

A technology of fingerprint sensor and inductive switch, which is applied in the direction of instruments, character and pattern recognition, computer parts, etc., and can solve the problem of increasing

Active Publication Date: 2016-02-10
IMAGE MATCH DESIGN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the higher the sensitivity of the sensing circuit, the greater the accompanying noise, especially for the push-type capacitive sensing

Method used

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Examples

Experimental program
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Example Embodiment

[0053] Please refer to figure 1 , Which shows the component architecture of the fingerprint sensor 1 according to an embodiment of the invention. The fingerprint sensor 1 includes a sensing insulating layer 10, a plurality of sensing electrodes 12, a row of multiplexers 14, a column of multiplexers 16, a controller 18, and an offset cancellation circuit 60. Wherein, the plurality of sensing electrodes 12 are adjacent to the sensing insulating layer 10 and are electrically connected to the row multiplexer 14, the column multiplexer 16, and the offset cancellation circuit 60, and the row multiplexer 14 and the column multiplexer 16 It is electrically connected to the controller 18. In more detail, each sensing electrode 12 is a pixel, a plurality of sensing electrodes 12 form a specific pixel array, and the specific pixel array has a specific number of rows and a specific number of columns, the row multiplexer 14 The column multiplexer 16 is based on a preset program and the con...

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Abstract

If minimal capacitance change of fingerprint peak and fingerprint valley in a fingerprint needs to be sensed by utilizing capacitance sensing, a high-sensitivity sensing circuit must be designed. However, higher the sensitivity of the sensing circuit is, larger the noise accompanied therewith is, and especially for the press-type capacitance sensing array, a capacitance sensing unit and the accompanied noise change with the difference at different lines and rows. The fingerprint sensor can eliminate possible stray capacitance in the circuit layout, and furthermore, is configured with an offset elimination circuit; the offset elimination circuit has two different capacitors so as to carry out optimum processing on the capacitance sensing noise; and then, fingerprint peak and fingerprint valley signals passing through the offset elimination circuit can be connected to an amplifier to improve individual signal intensity. Therefore, through the two capacitors of the offset elimination circuit, the signals of each sensing electrode is allowed to be optimum.

Description

technical field [0001] The invention relates to a fingerprint sensor, in particular to a fingerprint sensor with enhanced design for the fingerprint image of a capacitive fingerprint sensing chip. Background technique [0002] Due to the capacitive fingerprint sensing technology, in addition to maintaining a sufficient capacitance signal, it must also overcome the electrostatic damage when the finger is touched; therefore, on the one hand, in order to generate a sufficient capacitance signal, when designing a capacitive sensing chip, it must be considered Use a sensing electrode with a higher capacitance value and a thinner insulating capacitive sensing layer with a higher dielectric constant to avoid the generation or influence of other stray capacitances; on the other hand, in order to generate sufficient electrostatic protection, then A thicker protective layer and other static elimination designs are required, such as metal mesh for static protection. However, when the ...

Claims

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Application Information

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IPC IPC(8): G06K9/00
Inventor 王廷熏罗炎国
Owner IMAGE MATCH DESIGN
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