KR20120138887A

KR20120138887A - Method for detecting pattern using a touch sensor and touch sensor for finger-print recognition

Info

Publication number: KR20120138887A
Application number: KR1020110058298A
Authority: KR
Inventors: 정진화
Original assignee: 솔렌시스 주식회사
Priority date: 2011-06-16
Filing date: 2011-06-16
Publication date: 2012-12-27
Also published as: WO2012173454A2; WO2012173454A3

Abstract

PURPOSE: A pattern detecting method using a touch sensor and a touch sensor of a conductive method using the same are provided to recognize a fingerprint by using a touch sensor of a conductive capacitive type. CONSTITUTION: Each sensor node(121) recognizes the variation of capacitance according to a distance with an object surface having a height pattern. A vertical distance of the sensor node and the object surface is calculated according to the variation of capacitance. The height pattern of the object surface is generated by combining the vertical distance of each sensor node. The height pattern is a fingerprint of a person.

Description

Pattern detection method using touch sensor and capacitive touch sensor with fingerprint recognition {METHOD FOR DETECTING PATTERN USING A TOUCH SENSOR AND TOUCH SENSOR FOR FINGER-PRINT RECOGNITION}

The present invention relates to a pattern detection method using a touch sensor and a capacitive touch sensor capable of fingerprint recognition using the same. More specifically, the pattern detection method is a pattern detection method using a touch sensor including a plurality of micropattern-shaped sensor nodes, and recognizes a change in capacitance according to a distance from an object surface having a height pattern at each sensor node. And calculating a vertical distance between each sensor node and the object surface according to the capacitance change, and generating a height pattern of the object surface by combining the vertical distances of each sensor node. It is done.

In recent years, computer-based systems for various uses have been developed according to the development of computer technology. Also, key input is performed by the device by pressing or touching a certain number of keys within the operating range of the human hand. . However, for the purpose of accurate and rapid convenience, which is the original purpose of using a computer, a device that can be conveniently used by a user is required. This is an input device for computing by selecting a touch screen by pressing a finger directly on the display screen rather than pressing a key. . In recent years, the computer has been rapidly increasing in speed and low in price. In terms of the user interface, we moved from a keyboard-driven CUI to a mouse-driven pointing device. User needs are pursuing ease of use with high speed and low cost for computers. The touch panel is an input device that can be easily used by anyone of all ages by interactively and intuitively operating a computer by simply touching a button displayed on a display with a finger. In today's high-speed information society, almost every day people come in contact with computers. Recently, with the spread of smart phones and tablets and the development of networks, it is possible to simply access a database, and the need for accessing computers from various places is increasing. As an interface for anyone to use the computer simply, the touch panel is a very useful device. It has continued to grow more than 30% a year for many years and has been accelerating for several years. ATMs, such as banks, as well as a search system of streets, unmanned contract terminals, POS, game consoles, etc. have been used in a wide range of fields.

Touch type ITO glass is divided into two types: electric resistive touch pannal and dedicated touch pannel. It consists of adhesion of transparent ITO thin film and ITO glass with conductivity. Leave the part and leave that distance.

This is the main material of the touch panel, and TP such as resistive type (4 or 5 line) and surface capacitive type is applied to mobile phones, GPS, AIO PC, NB, industrial (eg ATM), and medical. The main application of TN / STN LCD ITO is liquid crystal monitor, which is already widely used in daily life. Consumption patterns and product manufacturers are also seeking to increase the value-added needs of their products by the vivid and visual effects of display panels. These types of products include liquid crystal color televisions, laptops, plasma monitors (PDPs) and liquid crystal monitors (LCDs). Capacitive touch screen also needs to use ITO material due to low electricity consumption and long life, but it has not received attention because of relatively high cost.

Recently, various capacitive touch screen products have been introduced to the world one after another. As a result, the progress of machining operations has increased in mass, and the cost has continued to fall, and capacitive touch screens have gradually become commonplace.

The surface capacitive touch screen uses a single layer of ITO, and when a finger touches the touch screen surface, a certain amount of charge is transferred to the human body. In order to recover the charge loss, the charges are supplemented by the square of the screen, and the amount of charges added in each direction is proportionally divided by the distance between the touch points to estimate the location of the touch points.

An object of the present invention is to provide an apparatus for recognizing a fingerprint using a capacitive touch sensor. In particular, it is possible to provide a fingerprint sensor based on ITO micropattern design rather than a conventional simple input device, to improve its reliability and convenience, and to provide a touch sensor that can be applied to a touch phone and a tablet PC. do.

The present invention provides the following means for solving the above problems.

According to an aspect of the present invention, there is provided a method of detecting a pattern using a touch sensor including a plurality of micropattern-shaped sensor nodes, the method including: recognizing a change in capacitance according to a distance from an object surface having a height pattern at each sensor node; Calculating a vertical distance between each sensor node and the object surface according to the capacity change, and generating a height pattern of the object surface by combining the vertical distances of each sensor node.

In this case, the height pattern is preferably a human fingerprint (fingerprint).

In addition, each sensor node is preferably an ITO cell.

At this time, it is preferable that at least three or more sensor nodes are located in the width direction of the valley 203 forming the human fingerprint.

In addition, the present invention preferably provides a capacitive touch sensor capable of fingerprint recognition of a person using the above method.

The present invention can provide an apparatus for recognizing a fingerprint using a capacitive touch sensor. In particular, it is possible to provide a fingerprint sensor based on ITO micropattern design rather than a conventional simple input sensor level, to improve its reliability and convenience, and to apply the touch sensor to a touch phone and a tablet PC. Can be.

1 is a block diagram of a capacitive touch sensor capable of fingerprint recognition according to the present invention.
2 is an illustration of a fingerprint according to the present invention.
3 is a view for explaining the operation principle of the capacitive touch sensor capable of fingerprint recognition according to the present invention.
Figure 4 is an embodiment of the operation of the capacitive touch sensor capable of fingerprint recognition according to the present invention.
Figure 5 is another embodiment of the capacitive touch sensor capable of fingerprint recognition according to the present invention.
6 is a view for explaining the operation principle of another embodiment of the capacitive touch sensor capable of fingerprint recognition according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. Even if the terms are the same, it is to be noted that when the portions to be displayed differ, the reference signs do not coincide.

The terms to be described below are terms set in consideration of functions in the present invention, and may be changed according to a user's intention or custom such as an experimenter and a measurer, and the definitions should be made based on the contents throughout the present specification.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being “connected” or “contained” by another component, it may be directly connected to or included in that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly included" to another component, it should be understood that no other component exists in the middle.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

As a technique for fingerprint recognition, an optical fingerprint recognition method is mainly used. It shoots strong light at the platen to reflect the fingerprint shape of the fingertip on the platen, which is then passed through the high refractive lens and input to the CCD. The input fingerprint image is digitized by a special algorithm. Such an optical type has high precision and high mechanical stability, but requires a light source, a lens, and a CCD camera, which is expensive and large in size, which is disadvantageous in miniaturization.

The present invention has been made to solve the problems of the prior art, which is usually arranged to form an array by arranging a plurality of micro-pattern sensor nodes having a uniform capacitance, and includes a charge (convex) and valleys on the surface When an object having a (concave portion) contacts, a sensor is provided that senses a change in capacitance at each sensor node and recognizes a pattern formed by the ridges and valleys on the surface. In particular, such a touch sensor can be used to recognize a human fingerprint.

That is, the present invention reads a method of obtaining fingerprint information by reading a change in the amount of charge according to the difference in the vertical distance between the ridge forming the fingerprint of the finger placed on the touch unit 100 and the respective sensor nodes forming the sensor array of the valley. to provide.

1 is a block diagram of a capacitive touch sensor capable of fingerprint recognition according to the present invention.

The pattern detection method using a touch sensor including a plurality of micropattern-shaped sensor nodes according to the present invention includes the steps of recognizing a change in capacitance according to a distance from an object surface having a height pattern at each sensor node 121; Calculating a vertical distance between each sensor node 121 and the object surface according to the change in capacitance, and generating a height pattern of the object surface by combining the vertical distances of each sensor node 121. Include.

Referring to FIG. 1, the substrate is provided with a transparent conductive film having electrical conductivity. In general, it is preferably ITO (Indium Tin Oxide). This ITO layer is formed by a micropattern manufacturing method. In other words, the sensor node is preferably an ITO cell.

Each sensor node is electrically connected to the sensor chip 130, and the sensor chip measures the capacitance change value of each sensor node.

In general, the size of the fingerprint ridge is about 0.5mm, the width of the valley between the fingerprint ridges is about 0.05 ~ 0.2mm. 2, the valley 203 between the fingerprint ridge 202 and the fingerprint ridge is represented. In the present specification, the ridge of the fingerprint may be expressed as the valley of the fingerprint and the valley between the ridges of the fingerprint.

The sensor node used in the present invention is preferably formed to be much smaller than this. In particular, in order to increase the resolution, it is preferable that at least three or more sensor nodes are provided at least in the width of the valleys (also referred to herein as valleys) between the fingerprint ridges.

Referring to FIG. 3, there is shown a diagram illustrating an operation principle of a capacitive touch sensor capable of fingerprint recognition according to the present invention. When the finger 200 is in contact with the touch unit 100, the touch unit 100 is in contact with a peak portion of the fingerprint forming the fingerprint ridge 202, and the valleys 203 of the fingerprint are spaced apart from each other. That is, the difference between the vertical distance between the peaks of the fingerprint and each sensor node and the vertical distance between the valleys 203 and the sensor nodes of the fingerprint is represented as a difference in capacitance at each sensor node.

Combining the capacitive values at each of these sensor nodes can connect them to obtain the ridges of the fingerprint.

That is, the core of the present invention is divided into parts that are contacted and spaced apart when contacting the parallel touch unit 100 by the height (or depth) of the peak and the valley forming the fingerprint, and recognizes the fine pattern In obtaining a fingerprint pattern through the sensor node to form.

4 is a diagram illustrating an operation of a capacitive touch sensor capable of fingerprint recognition according to the present invention. It is a feature of the present invention to miniaturize such a touch sensor. Such a touch sensor may be applied to a security device through fingerprint recognition, and may be mounted on a smartphone or a tablet PC.

The foregoing method describes a capacitive touch sensor using a cell method or a self capacitive panel method.

In addition, it is also possible to use the mutual capacitive panel method.

5 shows another embodiment of a capacitive touch sensor capable of fingerprint recognition according to the present invention, and FIG. 6 illustrates an operation principle of another embodiment of the capacitive touch sensor capable of fingerprint recognition according to the present invention. have.

The x-axis sensing line 141 and the y-axis sensing line 142 are fabricated based on the ITO fine pattern design. However, when using this, it should be able to accurately recognize a large number of touch positions.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

The present invention is not limited to the scope of the embodiments by the above embodiments, all having the technical spirit of the present invention can be seen to fall within the scope of the present invention, the present invention is the scope of the claims by the claims Note that is determined.

100: touch portion, 110: substrate, 121: micropattern, 130: IC, 200: finger, 201: fingerprint, 202: fingerprint portion, 203: bone portion of fingerprint

Claims

In the pattern detection method using a touch sensor including a plurality of sensor nodes of the fine pattern shape,
Recognizing a change in capacitance according to a distance from an object surface having a height pattern at each sensor node;
Calculating a vertical distance between each sensor node and the object surface according to the capacitance change;
Combining the vertical distances of each sensor node to generate a height pattern of the object surface,
Pattern detection method using a touch sensor.
The method according to claim 1,
The height pattern is a human fingerprint (fingerprint),
Pattern detection method using a touch sensor.
The method according to claim 1,
Wherein each sensor node is an ITO cell,
Pattern detection method using a touch sensor.
The method according to claim 2,
At least three sensor nodes are located in the width direction of the valley 203 forming the fingerprint of the person,
Pattern detection method using a touch sensor.
A capacitive touch sensor capable of recognizing a human fingerprint using the pattern detection method of claim 1.