KR20140034615A - Touch screen and control method thereof - Google Patents

Abstract

A touch screen and a control method thereof are disclosed. The touch screen according to the present invention is a screen unit driven by a capacitive touch of the input means, a touch key unit for switching the screen portion to a predetermined state when the capacitive touch of the input means, sensing the input means and the signal And a controller for controlling whether the touch key unit is activated according to the type of the sensor unit and the signal output from the sensor unit.

Description

TOUCH SCREEN AND CONTROL METHOD THEREOF}

The present invention relates to a touch screen and a control method thereof.

As an important means of processing in a rapidly changing information society, various portable terminals are becoming necessities of the modern society. As a representative example of the input devices applied to various portable terminals, a touch screen may be used when an input is touched.

The touch screen is a screen equipped with an input device that can receive a position when a user touches a finger, a stylus pen, or the like on the screen surface, and may be usefully used to perform a function intended by the user.

That is, when the user touches text or picture information previously displayed on the touch screen by hand, the terminal may determine what the user has selected according to the position of the touched screen and process a corresponding command.

As such, the touch screen is expanding its application field due to its convenience in inputting information on various terminals, and in particular, its application range is being expanded to portable devices aiming for miniaturization, and is replacing input devices such as keyboards and mice. Its usage is on the rise.

Meanwhile, the touch screen may be classified into various methods (resistive film, optical, electrostatic, ultrasonic, pressure, etc.) according to an implementation principle and an operation method. Among them, the capacitive touch screen uses a static electricity in the user's body. In other words, by coating an electrically conductive compound on the liquid crystal glass to keep the current flowing, when the user's finger, etc. touches the screen, electrons flowing on the liquid crystal are attracted to the contact point, the sensor at the corner of the touch screen detects this The input will be determined.

Such a capacitive touch screen can touch input even when the screen is slightly touched (produces an emotional feeling), and can support multi-touch (recognizing multiple contact areas at the same time). In addition, since the use of liquid crystal glass coated with a dielectric (a compound that conducts electricity) reduces the image quality, the touch screen mounted on a mobile phone, a smartphone, a tablet PC, etc. is mainly applied to a capacitive type.

However, the capacitive touch screen can be touched even if the user's finger or the like touches the screen. Therefore, when the user inadvertently touches the home key or operation key installed on the touch screen, the screen is initialized or It may cause inconvenience to the user such as returning to the previous menu.

In particular, when surfing the web or downloading data through various terminals with a capacitive touch screen, if the screen is initialized or returned to the previous menu due to an unintended touch of the user, the screen is accessed again from the beginning or back to the data folder. It may cause inconvenience, such as having to enter.

Korea Patent Publication No. 10-2012-0089101 (2012. 08. 09. published)

An object of the present invention is to provide a touch screen and a control method thereof, which can prevent a screen from being initialized or returned to a previous menu due to an unintended touch of a user.

According to an aspect of the present invention, a screen unit driven by a capacitive touch of the input means, a touch key unit for switching the screen portion to a predetermined state when the capacitive touch of the input means, sensing the input means and the signal There is provided a touch screen including a sensor unit for outputting a control unit and a control unit for controlling whether the touch key unit is activated according to a type of a signal output from the sensor unit.

Here, the sensor unit may output a hold signal when the sensing value of the input means for the touch key unit is less than or equal to a preset value, and the controller may deactivate the touch key unit according to the hold signal output from the sensor unit.

The controller may change the brightness of the screen unit according to the hold signal output from the sensor unit.

The sensor unit may include a photoconductive sensor whose conductivity changes according to the amount of light introduced.

The sensor unit may further include a conversion circuit for converting the conductivity of the photoconductive sensor into a digital signal.

The sensor unit may include a proximity sensor measuring whether the input means approaches within a sensing distance.

The sensor unit may be disposed between the screen unit and the touch key unit.

The sensor unit may be manufactured by laminating the touch panel on the screen unit.

According to another aspect of the invention, the step of outputting a signal from the sensor unit according to the access state of the input means to the touch key unit and controlling whether the touch key unit is activated according to the type of signal output from the sensor unit A method of controlling a touch screen is provided.

The outputting of the signal from the sensor unit may include outputting a hold signal when an access time of the input unit to the touch key unit is less than or equal to a preset value, and controlling whether the touch key unit is activated is a sensor. And deactivating the touch key unit according to the hold signal output from the unit.

The controlling of the activation of the touch key unit may further include changing the brightness of the screen unit according to a hold signal output from the sensor unit.

The sensor unit may include a photoconductive sensor whose conductivity changes according to the amount of light introduced.

The sensor unit may further include a conversion circuit for converting the conductivity of the photoconductive sensor into a digital signal.

In addition, the sensor unit may include a proximity sensor measuring whether the input means approaches within a sensing distance.

According to an exemplary embodiment of the present invention, the sensor unit may output a signal according to the approach state of the input means to the touch key unit, and control whether or not the touch key unit is activated according to the type of the signal. The touch can prevent the screen from being initialized or returned to the previous state.

1 is a view showing a touch screen according to an embodiment of the present invention.
2 is a view showing a modification of the touch screen according to an embodiment of the present invention.
3 is a view showing another modified example of the touch screen according to the embodiment of the present invention.
4 is a view showing a photoconductive sensor in a touch screen according to an embodiment of the present invention.
5 illustrates a conversion circuit in a touch screen according to an embodiment of the present invention.
6 illustrates a touch screen according to another embodiment of the present invention.
7 illustrates a proximity sensor in a touch screen according to another embodiment of the present invention.
8 is a flowchart illustrating a method of controlling a touch screen according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "having" 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.

Hereinafter, an embodiment of a touch screen and a method of controlling the same according to the present invention will be described in detail with reference to the accompanying drawings. In the following description with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals, and Duplicate explanations will be omitted.

1 illustrates a touch screen according to an embodiment of the present invention. 2 is a view showing a modification of the touch screen according to an embodiment of the present invention. 3 is a view showing another modified example of the touch screen according to an embodiment of the present invention. 4 is a view illustrating a photoconductive sensor in a touch screen according to an embodiment of the present invention. 5 is a diagram illustrating a conversion circuit in a touch screen according to an embodiment of the present invention.

Meanwhile, although the touch screen 1000 according to the present embodiment may be installed in various terminals including a smartphone, the touch screen 1000 installed in the smartphone is illustrated for convenience of description and will be mainly described.

1 to 5, the touch screen 1000 according to an embodiment of the present invention includes a screen unit 100, a touch key unit 200, a sensor unit 300, and a controller (not shown). do.

The screen unit 100 is a portion driven by a capacitive touch of the input unit 10 of FIG. 7, and may input the user's intention to the touch screen 1000 using static electricity. In this case, the capacitive touch refers to a liquid crystal glass that coats an electrically conductive compound so that the current continues to flow, and when the input unit (10 in FIG. 7) such as a user's finger or a stylus pen touches the screen unit 100, the liquid crystal As the electrons flowing above are attracted to the contact point, the sensor at the corner of the touch screen 1000 senses this to determine the input.

That is, when the user contacts the text or picture information displayed on the touch screen 1000 with the input means (10 of FIG. 7), the screen unit 100 contacts the screen unit 100 with which the various terminals provided with the touch screen 1000 are contacted. ), You can determine what the user has selected and process the corresponding command.

The touch key unit 200 is a part installed in the touch screen 1000 such that the screen unit 100 is switched to a preset state when the capacitive touch of the input unit 10 of FIG. 7 occurs. When there is a capacitive touch (10 in FIG. 7), the preset part is always switched to a specific state.

For example, the touch key unit 200 may include a home key preset to initialize the screen unit 100 when there is a capacitive touch of the input unit (10 of FIG. 7), or the input unit (10 of FIG. 7). If there is a capacitive touch, the screen unit 100 may include an operation key preset to return to the previous state.

Meanwhile, as illustrated in FIGS. 1 to 3, the touch key unit 200 may be integrally formed with the screen unit 100 on a portion of the screen unit 100 for the convenience of the user's touch screen 1000 operation. have. Thus, when the user inadvertently capacitively touches the touch key unit 200 while capacitively touching the screen unit 100, the screen unit 100 may be initialized or return to a previous state.

As such, if the screen unit 100 is initialized or returned to a previous state due to an unintentional capacitive touch of the user while using the touch screen 1000, this may cause inconvenience to the user. The touch screen 1000 may overcome the inconvenience described above through the sensor unit 300 and the controller (not shown).

The sensor unit 300 is a part installed in the touch screen 1000 to sense an input means (10 in FIG. 7) for the touch key unit 200 and output a signal. Different signals can be output depending on whether they are intended. In this case, the sensor unit 300 may vary the output value according to a change in the amount of light by the input means (10 of FIG. 7) or a sensing time for sensing the input means (10 of FIG. 7).

For example, when the user intends to touch the touch key part 200 intentionally, an access time of the input means (10 of FIG. 7) to the touch key part 200 may be relatively long. Therefore, if the access time of the input means (10 of FIG. 7) to the touch key unit 200 is measured to be relatively long, the sensor unit 300 may output the first signal accordingly.

On the other hand, when the user accesses the touch key unit 200 momentarily during the touch operation of the screen unit 100 without the intention of touching the touch key unit 200, the input means for the touch key unit 200 (FIG. 7). 10) the access time may be relatively short. Therefore, if the access time of the input means (10 of FIG. 7) to the touch key unit 200 is measured to be relatively short, the sensor unit 300 may output the second signal accordingly.

The control unit (not shown) is a part for controlling whether the touch key unit 200 is activated according to the type of the signal output from the sensor unit 300, and access of the input means (10 of FIG. 7) to the touch key unit 200. It is possible to control whether or not the touch key unit 200 is activated depending on whether it is intended.

In this case, the activation refers to a state in which the original function is normally performed, and when there is a capacitive touch of the input means (10 in FIG. 7) to the touch key unit 200, the screen unit 100 is switched to a preset state. This refers to the state of the touch key 200 that is normally made.

For example, as described above, when the user intends to touch the touch key unit 200 intentionally, the sensor unit 300 may output the first signal. Therefore, if the first signal is output from the sensor unit 300, the controller (not shown) controls to maintain the activation state of the touch key unit 200 so that the switching of the screen unit 100 to the preset state is normally performed. Can be.

On the other hand, when the user approaches the touch key 200 momentarily during the touch operation of the screen unit 100 without the intention of touching the touch key 200, the sensor unit 300 may output the second signal. have. Therefore, when the second signal is output from the sensor unit 300, the controller (not shown) may control the touch key 200 to be inactivated so that the screen unit 100 may not be switched to a preset state.

As described above, the touch screen 1000 according to the present exemplary embodiment outputs a signal from the sensor unit 300 according to the approach state of the input means (10 in FIG. 7) to the touch key unit 200, Accordingly, it is possible to control whether or not the touch key unit 200 is activated, thereby preventing the screen unit 100 from being initialized or returning to a previous state due to an unintended capacitive touch of the user.

Meanwhile, in the touch screen 1000 according to the present embodiment, the sensor unit 300 receives a hold signal when the sensing value of the input means (10 of FIG. 7) to the touch key 200 is less than or equal to a preset value. The control unit (not shown) may deactivate the touch key unit 200 according to the hold signal output from the sensor unit 300.

For example, in the case of the touch screen 1000 in which the preset value is set to 0.2 second, when the user intentionally wants to touch the touch key 200, the touch key 200 may be touched for a time exceeding 0.2 second. Can be. Therefore, if the input means 10 of FIG. 7 touches the touch key 200 for more than 0.2 seconds, the screen unit 100 may be normally switched to a preset state.

On the other hand, if the input means (10 in FIG. 7) touches the touch key 200 for a time of 0.2 seconds or less, it is instantaneous during the touch operation of the screen unit 100 without the user intending to touch the touch key 200. As shown in the case of approaching the touch key unit 200, the switching of the screen unit 100 to a preset state may be prevented.

As a result, it is possible to more easily determine whether the access of the input means (10 in FIG. 7) to the touch key unit 200 is intended, so that the touch screen 200 can be more effectively controlled. In addition, the preset value may be arbitrarily selected or changed by the user, and thus control of the touch screen 200 optimized for each user may be possible.

Here, the brightness of the screen unit 100 may be changed according to the hold signal output from the control unit sensor unit 300 so that the user may easily grasp the current state of the touch screen 200. have.

For example, when the hold signal is output from the sensor unit 300, if the brightness of the screen unit 100 is lowered or the screen unit 100 is controlled to be turned off, the user may unintentionally touch the touch key unit 200. You can see that you have reached. Accordingly, the user may determine that the user touches the touch key part 200 unintentionally and modify his operation.

Alternatively, when the user intentionally tries to touch the touch key unit 200, but the hold signal is output from the sensor unit 300 and the brightness of the screen unit 100 changes, the user grasps that his or her touch time was not sufficient. The touch time or the preset value for the touch key 200 may be adjusted.

In the touch screen 1000 according to the present embodiment, the sensor unit 300 may include a photoconductive sensor 310 and a conversion circuit 320.

The photoconductive sensor 310 is a sensor whose conductivity changes according to the amount of light flowing in, and when the input means (10 in FIG. 7) approaches the touch key 200, all or the light flowing into the photoconductive sensor 310 is approached. The degree to which a part is blocked by the input means (10 in FIG. 7) can be measured.

Specifically, as shown in FIG. 4, the photoconductive sensor 310 includes a photoconductive material 311, an electrode 312, a base 313, a cover glass 314, a cover cap 315, and a lead wire 316. It can be configured to include). In this case, the photoconductive material 311 is a material exhibiting an effect (photoconductive effect) of absorbing part of the light when the light hits the material, such as CdS, ZnS, etc., and increasing the conductivity of the material. The photoconductive effect can be exhibited with respect to light in all areas such as infrared rays.

In addition, the photoconductive sensor 310 measures the phenomenon in which the current flowing in the photoconductive material 311 increases according to the absorption amount of light when the electrode 312 is attached to the photoconductive material 311 to apply a voltage. To utilize.

For example, when an input means (10 in FIG. 7), such as a user's finger, is positioned above the photoconductive sensor 310 when the input means (10 in FIG. 7) approaches the touch key unit 200, the photoconductive sensor The amount of light flowing into the 310 may be reduced. And, if the input means (10 in FIG. 7) is moved away from the touch key 200, the input means (10 in FIG. 7) such as the user's finger on the photoconductive sensor 310 is removed, the photoconductive sensor 310 The amount of light entering can be increased again.

Therefore, by measuring the change in the amount of light flowing into the photoconductive sensor 310, it is possible to determine the approach state of the input means (10 in FIG. 7) to the touch key unit 200. Meanwhile, even if the conductivity of the photoconductive material 311 is changed according to the amount of light flowing into the photoconductive sensor 310, the amount of change in the conductivity is only an analog value that is changed within a specific range, thereby causing the touch screen 1000 to be changed. It may be difficult to utilize as a control signal for controlling the.

Therefore, in the touch screen 1000 according to the present embodiment, the sensor unit 300 may further include a conversion circuit 320 to convert the above-described analog value into a digital signal.

The conversion circuit 320 converts the conductivity of the photoconductive sensor 310 into a digital signal, and outputs a control signal for controlling the touch screen 1000. Specifically, an example of the conversion circuit 320 shown in FIG. 5 will be described below.

The input terminal of the conversion circuit 320 has IN (+, 3 pin) and IN (-, 2 pin), and if IN (+, 3 pin) has a higher voltage than IN (-, 2 pin), the output terminal (Out, 1 Pin signal) can be output high signal of + voltage. On the contrary, if IN (+, 3 pin) has a lower voltage than IN (−, 2 pin), a low signal of 0 volt (V) may be output to the output terminal (Out, 1 pin terminal). In this case, R1 may be a resistance of the photoconductive sensor 310.

Using this function, the voltage of the operation setting range section of the photoconductive sensor 310 is applied to the IN (-, 2-pin) terminal, and the voltage (V) displayed across the resistor R1 of the photoconductive sensor 310 is set to IN ( +, 3 pin) terminal, the conductivity according to the amount of light flowing into the photoconductive sensor 310 can be converted into a digital signal of the high or low signal and output to the output terminal (Out, 1 pin).

Meanwhile, although an example of the conversion circuit 320 according to the present embodiment is illustrated in FIG. 5, the present invention is not limited thereto, and the above-described high or low signal may be output oppositely depending on the setting of the conversion circuit 320. The conversion circuit 320 can be variously configured as necessary.

In the touch screen 1000 according to the present exemplary embodiment, the sensor unit 300 may have the photoconductive sensor 310 installed close to the touch key unit 200 as shown in FIG. 1. In particular, the photoconductive sensor 310 is installed between the position at which the user manipulates the screen unit 100 and the touch key unit 200, thereby indicating an access state of the input means (10 in FIG. 7) to the touch key unit 200. It can be measured.

In addition, the sensor unit 300 may be configured in such a manner that only the photoconductive material 311 is laminated on the touch panel of the screen unit 100 and manufactured as shown in FIG. 2, or the photoconductive sensor as shown in FIG. 3. The 310 may be integrally formed with the touch key unit 200, and thus, various modifications may be made to simplify the configuration of the touch screen 1000 and to facilitate manufacturing.

6 is a diagram illustrating a touch screen according to another embodiment of the present invention. 7 is a diagram illustrating a proximity sensor in a touch screen according to another embodiment of the present invention.

6 and 7, in the touch screen 2000 according to another embodiment of the present invention, the sensor unit 300 may include a proximity sensor 330.

Proximity sensor 330 is a sensor for measuring the proximity of the input means 10 within the sensing distance, the sensing is set to a predetermined range from the proximity sensor 330 when the input means 10 approaches the touch key 200. It may be determined whether the input means 10 has approached within a distance.

Specifically, as shown in FIG. 7, the proximity sensor 330 is emitted from the light emitter 331 and the light emitter 331 capable of emitting light such as infrared rays, visible rays, and ultraviolet rays, and then reflects to a specific object. It may include a light receiving unit 333 that can capture the light to be.

For example, when an input means (10 in FIG. 7), such as a user's finger or the like, is positioned above the proximity sensor 330 when the input means 10 approaches the touch key part 200, the light emitter 331 may be used. A portion of the emitted light may be reflected and captured by the light receiving unit 333. As the input unit 10 moves away from the touch key unit 200, an input unit such as a user's finger on the proximity sensor 330 (FIG. 7). If 10) is removed, light emitted from the light emitting unit 331 may not be captured by the light receiving unit 333.

Thus, by measuring whether the light emitted from the light emitting unit 331 is captured by the light receiving unit 333, it is possible to determine the approach state of the input means 10 to the touch key unit 200. In this case, in the present embodiment, the proximity sensor 330 discloses a configuration using light, but is not necessarily limited thereto, and may include a sensor using a sound wave such as a high frequency or measuring a change in illuminance. .

And, in the touch screen 2000 according to another embodiment of the present invention, the sensor unit 300 has a configuration in which the proximity sensor 330 is installed close to the touch key unit 200, in particular, as shown in FIG. 6. The unit 300 is disclosed to be disposed between the screen unit 100 and the touch key unit 200, but is not necessarily limited thereto.

For example, the touch screen 2000 according to another embodiment of the present invention, as in the case of the touch screen 1000 according to an embodiment of the present invention, only the light emitting unit 331 and the light receiving unit 333 the screen unit ( In order to simplify the configuration of the touch screen 2000 and to facilitate the manufacture, such as forming the laminate on the touch panel of 100 or forming the proximity sensor 330 integrally with the touch key 200. It can be variously modified.

On the other hand, the touch screen 2000 according to another embodiment of the present invention is a configuration of the touch screen 1000 according to an embodiment of the present invention except that the sensor unit 300 includes a proximity sensor 330 Since it is the same as or similar to, a detailed description thereof will be omitted.

8 is a flowchart illustrating a method of controlling a touch screen according to an embodiment of the present invention. In this case, in describing the method for controlling the touch screen according to the exemplary embodiment of the present disclosure, reference numerals of the components will be described with reference to FIGS. 1 to 7 for convenience of description.

As shown in FIG. 8, in the method for controlling a touch screen according to an embodiment of the present invention, first, the sensor unit 300 outputs a signal according to the approach state of the input means 10 to the touch key unit 200. (S100 and S200).

That is, it is measured whether the access time of the input means 10 to the touch key part 200 is equal to or less than the preset value (S100), and the access time of the input means 10 to the touch key part 200 is equal to or less than the preset value. In this case, the hold signal may be output (S200). On the other hand, when the access time of the input means 10 to the touch key unit 200 exceeds a preset value, the sensor unit 300 may output no signal or output another signal.

Next, according to the type of the signal output from the sensor unit 300 controls whether or not to activate the touch key unit 200 (S300).

That is, when the hold signal is output from the sensor unit 300, the touch key unit 200 may be deactivated according to the hold signal (S300). On the other hand, if no signal is output from the sensor unit 300 or another signal is output, the screen unit 100 may be switched to a preset state by maintaining the activation state of the touch key unit 200.

On the other hand, in the touch screen control method according to the present embodiment, step S300 may change the brightness of the screen unit 100 according to the hold signal output from the sensor unit 300.

In addition, in the touch screen control method according to the present embodiment, the sensor unit 300 may be configured to include the photoconductive sensor 310 and the conversion circuit 320, or may include the proximity sensor 330.

In this case, each configuration and the effects thereof disclosed in the touch screen control method according to an embodiment of the present invention and the touch screen 1000 according to an embodiment of the present invention and the touch screen according to another embodiment of the present invention Since it has been described above in (2000), a detailed description thereof will be omitted in the overlapping range.

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 of the invention as set forth in the appended claims. The present invention can be variously modified and changed by those skilled in the art, and it is also within the scope of the present invention.

10: input means
100: screen portion
200: touch key
300: sensor unit
310: photoconductive sensor
311: photoconductive material
312: electrode
313: base
314: glass cover
315: cover cap
316: lead wire
320: conversion circuit
330: proximity sensor
331: light emitting unit
333: light receiver
1000, 2000: touch screen

Claims (14)

A screen unit driven by a capacitive touch of the input means;
A touch key unit for switching the screen unit to a preset state when the capacitive touch of the input unit is performed;
A sensor unit for sensing the input means and outputting a signal; And
A control unit controlling whether the touch key unit is activated according to the type of the signal output from the sensor unit;
Touch screen comprising a.
The method of claim 1,
The sensor unit outputs a hold signal when the sensing value of the input means to the touch key unit is equal to or less than a preset value,
The control unit deactivates the touch key unit according to the hold signal output from the sensor unit.
3. The method of claim 2,
The controller may change the brightness of the screen unit according to the hold signal output from the sensor unit.
4. The method according to any one of claims 1 to 3,
The sensor unit
Touch screen, characterized in that it comprises a photoconductive sensor whose conductivity is changed in accordance with the amount of incoming light.
5. The method of claim 4,
The sensor unit
And a conversion circuit for converting the conductivity of the photoconductive sensor into a digital signal.
4. The method according to any one of claims 1 to 3,
The sensor unit
And a proximity sensor for measuring whether the input means approaches within a sensing distance.
The method of claim 1,
The sensor unit is disposed between the screen unit and the touch key unit.
The method of claim 1,
The sensor unit is manufactured by laminating the touch panel of the screen unit.
Outputting a signal from the sensor unit according to an access state of the input means to the touch key unit; And
Controlling whether the touch key unit is activated according to the type of the signal output from the sensor unit;
Control method of the touch screen comprising a.
10. The method of claim 9,
The step of outputting a signal from the sensor unit
Outputting a hold signal when the access time of the input means to the touch key part is equal to or less than a preset value;
Controlling whether or not the touch key unit is activated
And deactivating the touch key unit according to the hold signal output from the sensor unit.
11. The method of claim 10,
Controlling whether or not the touch key unit is activated
And changing the brightness of the screen unit according to the hold signal output from the sensor unit.
12. The method according to any one of claims 9 to 11,
The sensor unit
And a photoconductive sensor whose conductivity changes according to the amount of light introduced thereto.
The method of claim 12,
The sensor unit
And a conversion circuit for converting the conductivity of the photoconductive sensor into a digital signal.
12. The method according to any one of claims 9 to 11,
The sensor unit
And a proximity sensor measuring whether the input means approaches within a sensing distance.

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