TWI822266B - Ultrasonic fingerprint identification test device and test method thereof - Google Patents

Abstract

The present invention provides an ultrasonic fingerprint identification testing device, comprising: an ultrasonic fingerprint identification device, a bearing device and a testing device. A polarization test pad is fabricated on the inactive area of ​​the thin film transistor in the ultrasonic fingerprint identification device, and a plurality of openings corresponding to the polarization test pad are arranged on the carrier device. When the test device directly contacts the polarization test pad through the opening to test the polarization effect of the piezoelectric material, so that the test device does not contact the effective area of ​​the thin film transistor, the ultrasonic fingerprint identification device can be fully tested.

Description

Ultrasonic fingerprint identification test device and test method

The invention belongs to a fingerprint identification testing device and a testing method, and in particular, to an ultrasonic fingerprint identification testing device and a testing method thereof.

Ultrasonic fingerprint recognition technology can scan fingerprints through ultrasonic waves. Compared with traditional fingerprint recognition methods, ultrasonic fingerprint recognition can conduct a more in-depth analysis of fingerprints. Even if the surface of the finger is stained with dirt, it will not hinder ultrasonic sampling and can even penetrate The unique 3D signature of fingerprints is recognized beneath the surface of the skin. Even if there is water or sweat on the hands, it can still be accurately identified.

Usually in the production process of ultrasonic fingerprint recognition devices, the piezoelectric layer needs to be polarized to make the electric domain of the piezoelectric layer consistent to obtain maximum piezoelectric performance, and the usual step is to first coat the piezoelectric material On the thin-film transistor (TFT) with the circuit layer formed, the piezoelectric layer is then polarized.

The current way to judge the polarization effect of piezoelectric materials is to directly contact the piezoelectric material with a test device to convert the mechanical energy generated after the piezoelectric material is deformed into electrical energy. Since the piezoelectric material is deformed into permanent deformation, the tested product must be scrapped, increasing production costs. Moreover, only random inspections can be used to test products, which cannot effectively guarantee the quality of product shipments. How to develop a more effective testing method has always been the goal of the industry.

The purpose of the present invention is to provide an ultrasonic fingerprint recognition test device and a test method thereof. By making a polarization test pad on the inactive area of the thin film transistor, the test device only directly contacts the polarization test pad during testing, and The permanent deformation caused by the test will not affect the use of the effective area, thereby reducing the number of scrapped test products and allowing the product to be fully tested.

In order to achieve the above object, the present invention provides an ultrasonic fingerprint identification testing device, which includes: an ultrasonic fingerprint identification device, a carrying device and a testing device. The ultrasonic fingerprint identification device further includes: a circuit substrate, a piezoelectric layer and a panel layer. The circuit substrate has a plurality of effective areas arranged in an array. There is a channel around the outer edge of the effective area, and a polarization test pad is disposed on the channel. The piezoelectric layer covers the circuit substrate in a bonding direction. The panel layer covers the piezoelectric layer in the bonding direction.

The carrying device further includes: a mold base body and a shielding body. The mold base body has an accommodating space and a base. The base is located in the accommodating space and is connected to a ground wire. The accommodating space accommodates the ultrasonic fingerprint identification device, and the circuit substrate is against On the base, the circuit substrate is electrically connected to the ground wire. The shield body is connected to the mold base body to close the accommodating space. The shield body has a plurality of openings. The openings are connected to two sides of the shield body, and each opening position is connected to the polarization test pad respectively. The location corresponds.

The test device has a probe, and the probe is connected to a voltage measuring device. Wherein, when the probe directly contacts the piezoelectric layer through the opening, a deformation will occur at the position of the contacted piezoelectric layer, allowing the voltage measuring device to detect the polarization state of the piezoelectric layer.

In a preferred embodiment of the invention, the deformation is permanent deformation.

In a preferred embodiment of the present invention, the circuit substrate is a thin-film transistor (TFT).

In a preferred embodiment of the present invention, the panel layer is an organic light-emitting diode (OLED).

In a preferred embodiment of the invention, the voltage measuring device is electrically connected to the ground wire.

In a preferred embodiment of the present invention, the probe directly contacts the piezoelectric layer along the bonding direction.

In order to achieve the above objectives, the present invention provides an ultrasonic fingerprint identification test method, which includes the following steps:

Step (a): Provide an ultrasonic fingerprint identification device, a carrying device and a test device. The ultrasonic fingerprint identification device has a plurality of effective areas arranged in an array on an extended plane. There is a channel around the outer edge of the effective area, and the A polarization test pad is provided on the channel; the carrying device has a mold base body and a shield body, the mold base body is connected to a ground wire, and the shield body has a plurality of openings.

Step (b): Place the ultrasonic fingerprint identification device in the mold base body, and ground one side of the ultrasonic fingerprint identification device.

Step (c): The cover body closes the mold base body.

Step (d): Determine whether the position of the opening corresponds to the position of the polarization test pad; if not, adjust the position of the mask body, and then determine whether the position of the opening corresponds to the position of the polarization test pad; if so, then Activate the test device.

Step (e): Determine whether the test device is in direct contact with the polarization test pad; if not, adjust the position of the test device; if so, measure a deformation of the polarization test pad.

In a preferred embodiment of the present invention, the step (d) actuates the testing device by moving the testing device from a starting position along a coupling direction. After step (d), the following steps are included:

This step (d1): Determine whether the test device is in contact with the shield; if so, move the test device back to the starting position and adjust the starting position of the test device; if not, determine whether the test device is in direct contact with the shield. Polarization test pad.

In order to achieve the above objects and effects, the technical means and structures adopted by the present invention are hereby described in detail with reference to the preferred embodiment of the present invention. Its features and functions are as follows, so as to facilitate a complete understanding. However, it should be noted that the described content does not constitute a limitation of the present invention. In addition, in this specification, the numerical range expressed using "～" means the range including the numerical value described before and after "～" as a lower limit value and an upper limit value. In addition, among the numerical ranges described in stages in this specification, the upper limit or lower limit described in a certain numerical range may be replaced with the upper limit or lower limit of the numerical range described in other stages. In addition, among the numerical ranges described in this specification, the upper limit value or the lower limit value described in a certain numerical range may be replaced with the value shown in the Example. In addition, the term “step” in this specification is not only an independent step, but also includes a step that cannot be clearly distinguished from other steps as long as the desired purpose of the step can be achieved. Furthermore, although the terms "steps" and/or "blocks" may be used herein or in the drawings to imply various elements of a method employed, unless and unless the order of individual steps is expressly stated, such These terms should not be construed as implying any specific order within or between the various steps disclosed herein.

Please refer to Figures 1 to 5C, which are three-dimensional structural decomposition, assembly and top view schematic diagrams of a preferred embodiment of the ultrasonic fingerprint identification test device of the present invention, a side structural schematic diagram of the preferred embodiment of the ultrasonic fingerprint identification device and the initial stage of the polarization test pad. State, compressive stress, and tensile stress are side structural schematic diagrams of the preferred embodiment. The ultrasonic fingerprint identification testing device of the present invention includes: an ultrasonic fingerprint identification device 1, a carrying device 2 and a testing device 3.

The ultrasonic fingerprint identification device 1 further includes: a circuit substrate 11 , a piezoelectric layer 12 and a panel layer 13 . In a preferred embodiment of the present invention, the circuit substrate 11 is a thin-film transistor (TFT). The circuit substrate 11 has a plurality of effective areas 111 arranged in an array. The outer edge of the effective area 111 has A channel 112 is provided, and a polarization test pad 113 is provided on the channel 112 .

The piezoelectric layer 12 covers the circuit substrate 11 in a bonding direction 91 . The piezoelectric layer 12 may be lead zirconate titanate, polyvinylidene fluoride, aluminum nitride or piezoelectric copolymer. The circuit substrate 11 is electrically connected to the piezoelectric layer 12. When the piezoelectric layer 12 operates the fingerprint recognition function, the circuit substrate 11 is used to analyze the received signal.

When the piezoelectric layer 12 receives electrical energy, the piezoelectric layer 12 will deform due to the characteristics of the piezoelectric material. Therefore, if an alternating current of a specific frequency is supplied, the piezoelectric layer 12 can be caused to generate a corresponding frequency wave. When the piezoelectric layer 12 vibrates at a human-audible frequency within a time interval, the piezoelectric layer 12 can generate sound waves that are discernible to humans. The range of human audible frequencies mentioned above is any value between 20Hz and 20000Hz. When the piezoelectric layer 12 vibrates at an ultrasonic frequency in another time interval, the piezoelectric layer 12 may have the function of detecting human fingerprints, wherein the ultrasonic frequency is greater than 20,000 Hz.

When the piezoelectric layer 12 is used as a fingerprint identification element, the piezoelectric layer 12 has the function of sending and receiving ultrasonic waves at the same time. At the first time, the piezoelectric layer 12 is energized and vibrates to generate ultrasonic waves. Then, the piezoelectric layer 12 is powered off and switches to the detection mode. Then, at the second time, the reflected ultrasonic waves are received. The reflected ultrasonic waves cause the The piezoelectric layer 12 generates electrical signals, and the electrical signals are transmitted to the circuit substrate 11 for analysis.

The panel layer 13 covers the piezoelectric layer 12 in the bonding direction 91 . In the preferred embodiment of the present invention, it is best for the panel layer 13 to emit light by itself, so it is an organic light-emitting diode (OLED). The panel layer 13 is further covered with a cover plate 14 in the bonding direction 91. The cover plate 14 is preferably a glass cover plate. Of course, an ink layer 15 can be disposed between the panel layer 13 and the piezoelectric layer 12. The ink layer 15 can make it difficult for the user to detect the lower piezoelectric layer 12 and the circuit substrate 11, making the The ultrasonic fingerprint identification device 1 is more beautiful.

The carrying device 2 further includes: a mold base body 21 and a shielding body 22 . The mold base body 21 has an accommodating space 211 and a base 212. The base 212 is located in the accommodating space 211 and is connected to a ground wire 213; the accommodating space 211 accommodates the ultrasonic fingerprint identification device. 1, and the circuit substrate 11 is attached to the base 212, so that the circuit substrate 11 is electrically connected to the ground wire 213. The shield body 22 is connected to the mold base body 21 to close the accommodating space 211. The shield body 22 has a plurality of openings 221, and the openings 221 connect two sides of the shield body 22, and each opening 221 The positions respectively correspond to the positions of the polarization test pads 113 .

The testing device 3 has a probe 31 , the probe 31 is connected to a voltage measuring device 32 , and the voltage measuring device 32 is electrically connected to the ground wire 213 . When the probe 31 directly contacts the piezoelectric layer 12 through the opening 221 along the bonding direction 91, a deformation will occur at the position of the piezoelectric layer 12 where it contacts, and the deformation is a permanent deformation, causing the voltage amount to The measuring device 32 detects the polarization state of the piezoelectric layer 12 .

Please add Figures 5A to 5C. Since the current method is to directly contact the piezoelectric layer 12, the positive piezoelectric effect is used to convert the mechanical energy generated into electrical energy to determine the polarization effect of the piezoelectric layer 12. Some When a dielectric is deformed by an external force in a certain direction, polarization will occur inside it, and at the same time, positive and negative charges will appear on its two opposite surfaces. When the external force is removed, it will return to its uncharged state. In the prior art, when the testing device 3 directly contacts the effective area 111, the ultrasonic fingerprint identification device 1 must be scrapped due to the deformation of the effective area 111. If all the products are tested, all products will be scrapped. Therefore, the present invention ensures that the testing device 3 Only the polarization test pad 113 can be directly contacted, and the active area 111 is not contacted.

Please refer to FIG. 6 , which is a flow block diagram of a preferred embodiment of the ultrasonic fingerprint identification test method of the present invention. The invention provides an ultrasonic fingerprint identification test method, which includes the following steps:

Step S81: Provide an ultrasonic fingerprint identification device, a carrying device and a test device. The ultrasonic fingerprint identification device has a plurality of effective areas arranged in an array on an extended plane. There is a channel around the outer edge of the effective area, and the channel is A polarization test pad is provided; the carrying device has a mold base body and a shield body, the mold base body is connected to a ground wire, and the shield body has a plurality of openings.

Step S82: Place the ultrasonic fingerprint identification device in the mold base body, and ground one side of the ultrasonic fingerprint identification device.

Step S83: The cover body closes the mold base body.

Step S84: Determine whether the position of the opening corresponds to the position of the polarization test pad; if not, perform step S87: adjust the position of the mask body, and then determine whether the position of the opening corresponds to the position of the polarization test pad; if so , then the test device is activated to move the test device from a starting position along a coupling direction.

Step S85: Determine whether the test device contacts the shield body; if so, perform step S88: move the test device back to the starting position and adjust the starting position of the test device; if not, determine whether the test device Direct contact with the polarized test pad.

Step S86: Determine whether the test device is in direct contact with the polarization test pad; if not, adjust the position of the test device; if yes, perform step S89: measure a deformation of the polarization test pad.

Through the above detailed description, it can be fully demonstrated that the purpose and effect of the present invention are progressive in implementation, have great industrial utilization value, fully meet the requirements for invention patents, and the application can be filed in accordance with the law. The above are only preferred embodiments of the present invention, and do not limit the implementation and protection scope of the present invention. Those skilled in the art should be able to realize that any modification made by using the description and illustrations of the present invention Solutions resulting from equivalent substitutions and obvious changes shall be included in the protection scope of the present invention.

1: Ultrasonic fingerprint identification device 11:Circuit substrate 111: Valid area 112:Channel 113:Polarization test pad 12: Piezoelectric layer 13:Panel layer 14:Cover 15:Ink layer 2: Carrying device 21:Mold base body 211:accommodation space 212:Pedestal 213: Ground wire 22: Mask body 221:Open your mouth 3:Test device 31: Probe 32:Voltage measuring device 91:Combining direction S81: Provide an ultrasonic fingerprint identification device, a carrying device and a testing device S82: Place the ultrasonic fingerprint identification device in the mold base body S83: The mask body closes the mold base body S84: Determine whether the opening position corresponds to the polarization test pad position S87: Adjust the position of the mask body S85: Determine whether the test device contacts the mask body S88: Move the test device back to the starting position S86: Determine whether the test device directly contacts the polarization test pad S89: Measure a deformation of the polarization test pad

Figure 1 is an exploded schematic diagram of the three-dimensional structure of a preferred embodiment of the ultrasonic fingerprint recognition testing device of the present invention. Figure 2 is a schematic diagram of the three-dimensional structure of the preferred embodiment of the ultrasonic fingerprint recognition testing device of the present invention. Figure 3 is a schematic top structural view of a preferred embodiment of the ultrasonic fingerprint recognition testing device of the present invention. Figure 4 is a schematic side structural diagram of a preferred embodiment of the ultrasonic fingerprint identification device of the present invention. Figure 5A is a schematic side structural diagram of a preferred embodiment of the initial state of the polarization test pad of the present invention. Figure 5B is a schematic side structural diagram of a preferred embodiment of the compressive stress state of the polarization test pad of the present invention. Figure 5C is a schematic side structural diagram of a preferred embodiment of the polarization testing pad tension state of the present invention. FIG. 6 is a flow block diagram of a preferred embodiment of the ultrasonic fingerprint identification test method of the present invention.

1: Ultrasonic fingerprint identification device

11:Circuit substrate

111: Valid area

112:Channel

113:Polarization test pad

21:Mold base body

211:accommodation space

212:Pedestal

213: Ground wire

22: Mask body

221:Open your mouth

3: Test device

31:Probe

32:Voltage measuring device

91:Combining direction

Claims (6)

An ultrasonic fingerprint identification test device, which includes: an ultrasonic fingerprint identification device, and further includes: a circuit substrate with a plurality of effective areas arranged in an array, a channel around the outer edge of the effective area, and a channel provided on the channel There is a polarization test pad; a piezoelectric layer covering the circuit substrate in a bonding direction; a panel layer covering the piezoelectric layer in a bonding direction; a carrying device further including: a mold base body with An accommodation space and a base, the base is located in the accommodation space and connected to a ground wire; the accommodation space accommodates the ultrasonic fingerprint identification device, and the circuit substrate is pressed against the base , so that the circuit substrate is electrically connected to the ground wire; a shield body is connected to the mold base body to close the accommodation space, and the shield body has a plurality of openings, and the openings conduct the two sides of the shield body, And each opening position corresponds to the polarization test pad position respectively; a testing device has a probe, and the probe is connected to a voltage measuring device; wherein, when the probe directly contacts the piezoelectric layer through the opening , a deformation will occur at the position in contact with the piezoelectric layer, allowing the voltage measuring device to detect the polarization state of the piezoelectric layer. The ultrasonic fingerprint recognition test device according to claim 1, wherein the deformation is permanent deformation. The ultrasonic fingerprint recognition test device according to claim 1, wherein the circuit substrate is a thin-film transistor (TFT). The ultrasonic fingerprint recognition test device according to claim 1, wherein the panel layer is an organic light-emitting diode (OLED). The ultrasonic fingerprint recognition test device according to claim 1, wherein the voltage measurement device is electrically connected to the ground wire. The ultrasonic fingerprint recognition test device of claim 1, wherein the probe directly contacts the piezoelectric layer along the bonding direction.

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