RU2509340C1 - Sensor device for data input - Google Patents

Abstract

FIELD: information technology.

SUBSTANCE: sensor device for data input includes a transparent touch screen and a display behind said touch screen, connected to a control device, capable of randomly distributing characters and corresponding functions on an input field for each code input session. To limit the angle of view of images of characters, an insert is placed between the touch screen and the display, said insert having optical channels, wherein for each character displayed on the display, the number of optical channels N is selected such that N≥1, and the length of each optical channel, the linear dimension of a section of the field of the display in the channel to be viewed, as well as the linear dimension of the opening of the optical channel on the side of the touch screen should be in a defined ratio.

EFFECT: more secure input of a personal user identification code when using electronic devices.

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Description

The invention is intended for the safe input of personal information into electronic technical devices, such as ATMs, electronic access restriction systems and other similar devices.

Known sensor input device (RU 98104110 (A), IPC G06F 3/02, publ. 12/27/99), containing a touch panel for handwritten input of information, a means of influencing the panel, means for recognizing characters and a device for displaying the entered information.

The disadvantage of this device is that user input and displayed input information is available to nearby unauthorized persons.

Known sensor input device (US 6549194 (B1), IPC G06F 21/00; G07C 9/00; G07F 7/10, publ. 04/15/2003) containing a touch screen associated with a touch screen controller that is associated with an encryption processor located behind the touch screen display, electrically connected to the main processor, which is connected to the touch screen controller. The device is made with the possibility of random distribution of characters and their corresponding functions over the typesetting field for each code entry session.

The disadvantage of this device is the low secrecy of the input of personal data, as they can be visible to an outside observer or fall into the field of view of special technical means, for example, a hidden video camera.

Known sensor input device (FR 2819067 (A1), IPC G06F 21/00; G07C 9/00; G07F 19/00; G07F 7/10, published 05.07.2002) containing a display with the function of displaying randomly distributed characters on a dial a field and a touch screen associated with it, on which tactile zones corresponding to characters randomly distributed over the display are defined.

The disadvantage of this device is the low secrecy of the input of personal data, since they can be fixed either by a nearby unauthorized person, or using special technical means, such as binoculars.

Known sensor data input device (EP0965961 (A1), IPC G06F 1/00; G06F 15/00; G06F 3/041; G06Q 10/00; G06Q 40/00; G07D 9/00; G07F19 / 00, publ. 22.12. 1999), selected as a prototype, containing a display, a touch screen placed on top of it and a control system connected to them with the function of forming on the display images of a typed field from keys different from each other in the arrangement on the display or in the form or arrangement of keys on the typewriter field for each new user.

The disadvantage of this sensor input device is also the low privacy of code entry, as it can be copied by an outside observer or using special technical means, such as a hidden video camera.

The objective of the invention is to increase the level of secrecy of the input of personal data.

The task is achieved in that the touch input device, as in the prototype, contains a transparent touch screen and a display located behind it, connected to the control device, configured to randomly distribute characters and their corresponding functions across the typesetting field for each code entry session .

According to the invention, between the touch screen and the display there is a patch with optical channels made in it, and for each symbol displayed on the display, the number of optical channels N is selected from the condition N ≥ 1, and the length of each channel l satisfies the ratio:

,

,

where q is the maximum linear size of the portion of the display field open for viewing in the optical channel in a plane passing through the axis of the optical channel and the optical center of the operator, mm;

h is the maximum deviation of the axis of the optical channel from the center of the type-setting field of the device, mm;

;

;

Q is the linear size of the hole of the optical channel from the side of the touch screen in the plane passing through the axis of the optical channel and the optical center of the observer, mm

In FIG. 1 shows the case when the optical center of the operator (point O _about ) is located opposite the middle of the typing field of the touch input device (point s). The axis of the optical channel farthest from the middle s of the dialed field of the sensor data input device is offset by a distance h from O _о -s passing through the optical center of the operator O _о . From the geometric relationships shown in FIG. 1, it follows that the image of the part of the symbol a-b for the optical channel farthest from the middle s of the typesetting field of the touch input device will be fully visible to the operator provided that:

, (1)

, (one)

where l is the length of the optical channel, mm;

L _o - the distance from the optical center of the operator O _about to the plane of the type-setting field of the device, mm;

Q is the linear size of the upper hole of the optical channel in the plane passing through the axis of the optical channel and the optical center of the operator, mm;

q is the maximum linear size of the portion of the display field open for viewing in the optical channel in a plane passing through the axis of the optical channel and the optical center of the operator, mm;

h is the maximum deviation of the axis of the optical channel from the center of the type-setting field of the sensor data input device, mm.

When the optical center of the outside observer (point О _н ) is located at a distance H (Fig. 2) from the middle s of the array field of the device in the plane vw parallel to the plane sr of the array field, it follows from geometrical relations that the image of a part of the symbol in section a-b for the optical channel closest to the observer and farthest from the middle of the type-setting field will be completely invisible to the outside observer provided:

, (2)

, (2)

where L _n - the distance from the optical center of the observer to the plane of the array field of the device, mm;

H is the minimum deviation of the optical center of the observer from the center of the type-setting field of the device in a plane parallel to the plane of the type-setting field, mm.

The analysis of expressions (1), (2) shows that both requirements for the length of the optical channels can be fulfilled simultaneously if the ratio of a number of geometric dimensions is ensured in accordance with the expression:

(3)

(3)

where m is the coefficient of excess of the linear size Q of the upper hole of the optical channel over the linear size q in the plane passing through the axis of the optical channel and the optical center of the observer;

Q is the linear size of the upper hole of the optical channel in the plane passing through the axis of the optical channel and the optical center of the observer, mm .;

- отношение величины расстояния от оптического центра оператора L_o до плоскости наборного поля устройства к величине расстояния от оптического центра наблюдателя L_н до плоскости наборного поля.

- the ratio of the distance from the optical center of the operator L _o to the plane of the input field of the device to the distance from the optical center of the observer L _n to the plane of the input field.

Using expressions (1), (2), (3), it is possible to determine the dimensions of the input field of the input device (characterized by the parameter h), the cross-sections of separate optical channels (characterized by the parameters q, Q) and the length of the optical channels l, which provide a set hidden from the outside observer code by the operator with possible options for the location of the operator and the outside observer relative to the type-setting field of the device (characterized by the parameters L _o , L _n , H).

Based on the probable approach of an outside observer to the operator, it is possible to take the parameter H equal to 500 mm. Taking into account that, ceteris paribus, the greatest value of the lower boundary of the optical channel length is achieved at a maximum distance from the optical center of the observer to the plane of the input field of the input device L _n.max , which for a person is about 600 mm, and the minimum value of the upper boundary of the length optical channel is achieved at a minimum distance from the optical center of the operator to the plane of the input field of the input device L _o.min , which for a person is about 450 mm, expressed The equations (1), (2), (3) can be transformed to the form:

(4)

(four)

(5)

(5)

(6)

(6)

Therefore, using dependencies (4), (5), (6), it is possible to determine the main structural dimensions of the typesetting field of the input device and optical channels to achieve the secrecy of entering a personal identifier code by a user of electronic technical devices.

Using overlays with optical channels allows you to achieve the effect of hiding the characters at a given viewing angle, since part of the character is overlapped by the opaque walls of the optical channels. In this case, the user can enter the required sequence of characters of the code, which cannot be seen by an outside observer. In this case, it is possible to see the symbol only at a smaller viewing angle, which increases the privacy of entering the user's personal data.

In FIG. Figure 1 shows a variant of the location of the optical center of the operator at the boundary of the field of view of the portion of the symbol farthest from the middle of the dialed field of the touch input device.

In FIG. Figure 2 shows the location of the optical center of a third-party observer at the boundary of the symbol invisibility zone farthest from the middle of the dialed field of the sensor data input device.

In FIG. 3 illustrates the possible placement of symbol images on a typesetting field of a sensor data input device before performing a code input operation.

In FIG. 4 shows the design of a touch input device.

In FIG. Figure 5 shows the possible placement of symbol images on a typed field of a touch input device when the code input operation is repeated.

In FIG. Figure 6 shows the most distant display section from the optical center of the operator, an overlay variant with several optical channels per symbol.

In FIG. 7 shows a section of the display closest to the optical center of the third-party observer, an overlay variant with several optical channels per symbol.

The sensor data input device comprises a display 1, on which a dial-up field 2 is displayed (Fig. 3, 4). Above the display 1 there is a patch 3 with through optical channels 4 through which sections of the display 1 with symbols 8 are visible.

The walls 5 of the optical channels 4 are made opaque (Fig. 4), for example, in the form of inserts of thin opaque material. Above the trim 3 is a transparent touch screen 6. The control device 7 is electrically connected to the display 2, the touch screen 6 and an external electronic device, such as an electronic computing machine of an ATM (not shown).

As the display 1, any known construction of its implementation can be used, for example, liquid crystal, LED, sign-synthesizing, gas-discharge, projection, electron-beam, and others.

Cover plate 3 with through optical channels 4 can be made of opaque material or transparent material, but with opaque walls 5 of optical channels 4. Cover plate 3 can be formed of individual optical channels using collapsible (latch) or collapsible (gluing, welding) methods compounds. In FIG. 4 shows a patch 3 with one optical channel per zone associated with one symbol. In FIG. 3 and 5, an overlay is shown with 36 optical channels per each of the zones associated with one of the symbols. The length of the optical channels is selected based on the size of the characters and the typesetting field of the touch input device using expressions (4) - (6). An increase in the number of optical channels 4 per each symbol 8 is accompanied by a decrease in the length l of the optical channels 4, which is necessary to ensure the required viewing angle of the symbols 8 and, accordingly, the secrecy of the code input, which allows reducing the dimensions of the proposed sensor data input device. The cross section of the optical channels 4 may be different, for example, rectangular, triangular, hexagonal, octagonal and others.

As a transparent touch screen 6, any known design for its implementation can be used, for example, resistive, capacitive, projective-capacitive, surface-acoustic and others. The touch screen 6 may have a vandal resistant design with an additional protective glass. The control device 7 is an electronic circuit with a microprocessor and associated software.

The proposed sensor data input device can be located both in one housing with an external electronic device (ATM, payment terminal), or separately (a remote keypad, code lock, computer).

When using the proposed touch input device, the operator is placed opposite the type-setting field 2 of the touch input device with a limited viewing angle of symbol images 8 in the free viewing area through the optical channels 4 of the overlay 3 on the display 1 opposite the middle s of the input field 2 of the input device (Fig. 1 , 6). The geometric parameters of the optical channels 4 provide an overview of the parts of the symbols on the display 1 even in the most distant optical channels from the middle of the typing field of the touch input device (point s) when the operator is placed opposite the typing field (the optical center of the operator at the point О _о ), as shown in FIG. 6. Most of the sections of symbols 8 on the display 1 are not visible to an outside observer located next to the operator (the optical center of the observer at the point О _н ), even in the channels 4 closest to the observer, as shown in FIG. 2, 7. The operator performs the preliminary procedures prior to entering the code (recognition of a plastic card, starting the process of entering the code, etc.).

After that, the control device 7 arbitrarily generates an arrangement of the images of symbols 8 on the display 1, which are assigned functions corresponding to the images of symbols 8 displayed on the display 1, for example, as shown in FIG. 3.

Then the operator presses the desired sequence of code symbols, for example 7018, on the touch screen 6 (the pressed areas are highlighted in color in Fig. 3). The touch screen 6 transmits information about the coordinates of the clicks to the control device 7, which compares each zone 9 pressed by the user of the touch screen 6 with the symbol 8 located behind the cover 3 with the optical channels 4 and the function assigned to it. Next, the control device 7 encrypts the signals about the data entered by the user and their transmission to external electronic devices (ATM, electronic code lock, etc.) using the proposed touch device as input means.

An outside observer located outside the free viewing zone for the images of symbols 8 (Fig. 2, 7) sees only the inner surface of the walls 5 of the optical channels 4 in the area a-e lying outside the area containing basic information about the symbols 8 on display 1. only fixes the location of the pressed zones 9 on the touch screen 6 (highlighted in color in Fig. 3) and the sequence of their pressing, but cannot match the location of the zones pressed on the touch screen with images of symbols 8.

When an outside observer tries to reproduce the code input 7018, he starts a new code input process, after which the control device 7 randomly generates the location of the images of the characters 8 on the display 1 and they are assigned functions corresponding to the images of the characters 8, for example, as shown in FIG. 5. Moreover, the location of the images of characters 8 on the typesetting field 2 (Fig. 5) in this case will not coincide with the previous location of the images of characters 8 (Fig. 3). Therefore, the set of previously observed sequence of pressed characters 8 will not give the desired result - entering the correct sequence of characters. In this case, the number 20_7 will be dialed, which does not correspond to the required code. To dial the correct code 7018 on the newly formed dial-up field 2 of the touch input device (Fig. 5), you should press the sections 9 of the touch screen 6 highlighted in color, and in the required sequence, which cannot be known to an outside observer in advance.

The proposed touch input device allows you to increase the secrecy of the input of personal data of the user when working with electronic technical devices.

Claims (1)

A touch-sensitive data input device comprising a transparent touch screen and a display located behind it, connected to a control device, arranged to randomly distribute characters and their respective functions across a typed field for each code input session, characterized in that there is an overlay between the touch screen and the display with optical channels made in it, and for each symbol displayed on the display, the number of optical channels N is selected from the condition N ≥ 1, and the length of each channel is l satisfies the relationship:
$$\frac{300\cdot \text{q}\cdot \left(\text{m}+\mathrm{one}\right)}{500-\text{h}+0.5\cdot \text{q}}\le \text{l}\le \frac{225\cdot \text{q}\cdot \left(\text{m}-\mathrm{one}\right)}{\text{h}-0.5\cdot \text{q}}$$

,
where q is the maximum linear size of the portion of the display field open for viewing in the optical channel in a plane passing through the axis of the optical channel and the optical center of the operator, mm;
h is the maximum deviation of the axis of the optical channel from the center of the type-setting field of the device, mm;
$$\text{m =}\frac{\text{Q}}{\text{q}}\ge \frac{375+0.25\cdot \text{h}-0.125\cdot \text{q}}{375-1.75\cdot \text{h}+0.875\cdot \text{q}}$$

;
Q is the linear size of the hole of the optical channel from the side of the touch screen in a plane passing through the axis of the optical channel and the optical center of the observer, mm

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