JP2017068306A - Communication terminal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication terminal device which can prevent false detection in a proximity sensor.SOLUTION: A proximity sensor 40 is arranged in a peripheral area of a front panel, surrounding a screen. A proximity detection unit 120 detects proximity of an object with respect to the front panel, on the basis of a result of comparing an output value of the proximity sensor 40 and a detection threshold. The proximity sensor 40 includes a light-emitting unit for emitting an infrared ray, and a light-receiving unit which receives the infrared ray reflected by the object or the front panel, to be converted to an electric signal. A detection threshold setting unit 130 sets a detection threshold, on the basis of the output value of the proximity sensor 40 when it is detected that the proximity sensor 40 is not covered with the object, on the basis of an output value of a touch panel 34 and the output value of the proximity sensor 40.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a communication terminal device including a proximity sensor.

  Among communication terminal devices such as smartphones and tablets, those using a touch panel display have become widespread. Some of such communication terminal devices are equipped with a proximity sensor for controlling the display.

  The proximity sensor is a sensor for detecting that the detection target is approaching without contacting the detection target (for example, a human body). The communication terminal device is mainly used to detect that the user's ear or face is approaching the display (see, for example, JP 2012-34263 A (Patent Document 1)).

JP 2012-34263 A

  As a proximity sensor mounted on a communication terminal device, there is an infrared proximity sensor. The infrared proximity sensor is configured such that infrared light emitted from a light emitting element hits a detection target, and the light receiving element converts reflected light reflected from the detection target and returned to an electrical signal.

  In the above configuration, an approaching detection object is detected by comparing an electrical signal output from the light receiving element with a preset detection threshold. Therefore, by adjusting the detection threshold, the distance from the object when detecting the approach of the object can be adjusted.

  On the other hand, in the communication terminal device, the reflected light received by the light receiving element of the proximity sensor includes a considerable amount of reflected light from the front panel arranged in front of the proximity sensor. Therefore, if the reflected light from the front panel exceeds the detection threshold, it is erroneously determined that the reflected light from the detection target exceeds the detection threshold, and as a result, the detection target approaches. There is a risk of being detected erroneously. Therefore, in order to prevent erroneous detection in the proximity sensor, it is required to set the detection threshold accurately by considering the influence of the reflected light from the front panel.

  The present invention has been made to solve such a problem, and an object thereof is to provide a communication terminal device capable of preventing erroneous detection in a proximity sensor.

  In one aspect of the present invention, a communication terminal device includes a display having a screen, a front panel disposed on the screen of the display, a touch detection unit, a proximity sensor, a proximity detection unit, and a detection threshold setting unit. Prepare. The touch detection unit is configured to detect contact of an object on the screen. The proximity sensor is installed in the peripheral area of the front panel surrounding the screen. The proximity detection unit detects the approach of the object to the front panel based on the result of comparing the output value of the proximity sensor and the detection threshold value. The proximity sensor includes a light emitting unit and a light receiving unit. The light emitting unit emits light toward the outside of the communication terminal device through the front panel. The light receiving unit is configured to receive light emitted from the light emitting unit and reflected by the object or the front panel and convert it into an electrical signal. The detection threshold setting unit sets the detection threshold based on the output value of the proximity sensor when it is detected that the proximity sensor is not covered with an object based on the output value of the touch detection unit and the output value of the proximity sensor. To do.

  According to the present invention, it is possible to provide a communication terminal device capable of preventing erroneous detection in a proximity sensor.

It is an external view which shows an example of the external appearance of the communication terminal device which concerns on this Embodiment. It is a schematic sectional drawing which shows one structural example of a proximity sensor. It is the wave form diagram which showed the output value of the proximity sensor. It is a schematic sectional drawing for demonstrating the shift | offset | difference of the detection distance in a proximity sensor. It is a figure which shows an example of the hardware constitutions of the communication terminal device which concerns on this embodiment. It is a block diagram which shows the control structure of the communication terminal device which concerns on this embodiment. It is a flowchart for demonstrating the flow of the setting process of a detection threshold value in a detection threshold value setting part. It is a schematic diagram for demonstrating the determination operation | movement in step S02 of FIG. It is the side view of the communication terminal device seen from the arrow IX direction in FIG. It is an external view which shows an example of a detection area. It is a wave form diagram for demonstrating the setting process of the detection threshold value in a detection threshold value setting part.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, the same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated in principle.

  FIG. 1 is an external view showing an example of the external appearance of a communication terminal device according to the present embodiment. In this specification, a smartphone is assumed as a communication terminal device, but the present invention is not limited to a smartphone, and can be applied to any communication terminal device such as a PDA (Personal Digital Assistant) and a tablet PC (Personal Computer). is there.

  FIG. 1 shows a front appearance of the communication terminal device 10. The communication terminal device 10 has a flat rectangular appearance. Hereinafter, for convenience of explanation, the longitudinal direction of the main surface of the communication terminal apparatus 10 is defined as the vertical direction, and the short direction of the main surface is defined as the left-right direction.

  Referring to FIG. 1, the front appearance of communication terminal device 10 is mainly formed by front panel 20. The front panel 20 is formed of a vertically long flat rectangular transparent substrate. A touch screen 30 is integrally formed on the front panel 20.

  The touch screen 30 is a display-integrated input device that accepts user input operations as well as displaying various data. Specifically, the touch screen 30 includes a display and a touch panel. The display includes a screen for displaying an image.

  The display is attached to the back surface of the front panel 20. The display is composed of, for example, liquid crystal or organic EL (Electro Luminescence). The touch panel is disposed between the front panel 20 and the display. In the present embodiment, the display, the touch panel, and the front panel 20 are stacked. However, the present invention is not limited to this, and a display having a touch panel function may be used. A touch panel and a display having a touch panel function constitute a “touch detection unit” configured to detect contact of an object on a screen.

  A proximity sensor 40 is built in a peripheral area surrounding the screen of the front panel 20. FIG. 1 illustrates a case where the proximity sensor 40 is installed on the upper left side of the front panel 20, for example.

  The proximity sensor 40 is a sensor for detecting that an object is approaching without contacting an object (for example, a human body). The proximity sensor 40 is configured by a reflective photoelectric sensor. The reflection type photoelectric sensor is a device that obtains an output signal by emitting light from a light emitting unit, detecting light reflected by a detection target by a light receiving unit, and converting the light into an electric signal. In the present embodiment, the proximity sensor 40 is, for example, an infrared proximity sensor including an infrared light emitting unit and an infrared light receiving unit. The light emitted from the light emitting unit may be light other than infrared light, for example, ultraviolet light or visible light.

  FIG. 2 is a schematic cross-sectional view showing a configuration example of the proximity sensor 40. With reference to FIGS. 1 and 2, the front panel 20 is provided with an opening 22 for exposing the proximity sensor 40. Specifically, the front panel 20 includes a vertically long flat rectangular transparent substrate 24 and a light shielding film 26. As the transparent substrate 24, for example, a glass substrate is used.

  The light shielding film 26 is attached to the back surface of the transparent substrate 24. The light shielding film 26 is disposed so as to surround an area corresponding to the screen of the display. The light shielding film 26 has an opening 22 in a region corresponding to the proximity sensor 40.

  The proximity sensor 40 includes a light emitting unit 42 and a light receiving unit 44. The light emitting unit 42 and the light receiving unit 44 are mounted on a substrate 50 arranged to face the back surface of the front panel 20. The light emitting unit 42 and the light receiving unit 44 are located in the opening 22 in the front view of the communication terminal device 10.

  The light emitting unit 42 emits infrared light. The infrared light emitted by the light emitting unit 42 is emitted toward the outside of the communication terminal device 10 through the opening 22 of the front panel 20 as indicated by an arrow in FIG. The emitted infrared rays hit the object 200 and are reflected.

  The light receiving unit 44 receives infrared rays reflected from the object 200 and returned through the opening 22 of the front panel 20. The light receiving unit 44 converts the received infrared light into an electrical signal and outputs it.

  FIG. 3 is a waveform diagram showing the output value of the proximity sensor 40. In FIG. 3, the vertical axis indicates the output value of the proximity sensor 40, and the horizontal axis indicates the distance from the main surface of the front panel 20 to the object 200. In the present specification, the output value of the proximity sensor 40 is a physical quantity representing the amount of received infrared light detected by the light receiving unit 44. The unit of the output value of the proximity sensor 40 may be lux (lx), ampere (A), volt (V), or simply a digital count value. Also good.

  As indicated by the solid line in the figure, the output value of the proximity sensor 40 decreases as the distance from the front panel 20 to the object 200 increases, that is, as the object 200 moves away from the front panel 20. When the object 200 is sufficiently separated, the output value of the proximity sensor 40 converges to a constant value. In this specification, a value when the output value of the proximity sensor 40 converges is defined as a “base value”. The base value depends on the amount of received infrared light reflected from the front panel 20 without passing through the front panel 20.

  The output value of the proximity sensor 40 is compared with a preset detection threshold. When the output value of the proximity sensor 40 is larger than the detection threshold, it is detected that the object 200 is approaching. On the other hand, when the output value is equal to or smaller than the detection threshold, it is detected that the object 200 is not approaching.

  In this specification, the distance when the approach of the object 200 is detected is defined as “detection distance”. As is apparent from FIG. 3, the detection distance decreases as the detection threshold is increased, and conversely increases as the detection threshold is decreased. Therefore, based on the output waveform of the proximity sensor 40, a detection threshold can be set according to the detection distance to be realized.

  However, in consideration of the influence of the reflected light from the front panel 20, it is necessary to set the detection threshold to a value higher than the base value. This is because if the detection threshold is less than or equal to the base value, it is erroneously detected that the object 200 is approaching when the amount of reflected light from the front panel 20 exceeds the detection threshold.

  Here, as described above, the base value depends on the amount of reflected light from the front panel 20. Therefore, as shown in FIG. 4, when dirt 210 adheres to the surface of the front panel 20 so as to cover the opening 22 of the front panel 20, the amount of reflected light from the front panel 20 increases. For this reason, the base value also increases.

  When the amount of reflected light from the front panel 20 increases, the output value of the proximity sensor 40 becomes a so-called raised state due to the increase in reflected light from the front panel 20, as indicated by a broken line in FIG. . For this reason, when the detection threshold is fixed to a predetermined design value, a deviation occurs in the detection distance. This shift in the detection distance leads to erroneous detection of the approach of the object 200. Note that the amount of shift in the detection distance varies depending on how dirty the front panel 20 is.

  Therefore, in the present embodiment, the detection threshold is set based on the actual output value of the proximity sensor 40. The actual output value of the proximity sensor 40 means a base value in the output value of the proximity sensor 40. According to this, since the contamination level of the front panel 20 can be reflected in the detection threshold, the above-described shift in the detection distance can be eliminated.

  In the present embodiment, the setting of the detection threshold is executed by a CPU (Central Processing Unit) inside the communication terminal device 10. Below, the structure and operation | movement of the communication terminal device 10 containing CPU are demonstrated.

  FIG. 5 is a diagram illustrating an example of a hardware configuration of the communication terminal device 10 according to the present embodiment. Referring to FIG. 5, communication terminal apparatus 10 includes, as main components, CPU 100, memory 102, wireless communication unit 104, communication I / F (Interface) 106, power supply circuit 108, and communication antenna 110. The touch screen 30 and the proximity sensor 40 are provided. Each component is mutually connected by a data bus (not shown).

  The CPU 100 executes a program. The CPU 100 constitutes a control unit that comprehensively controls each unit of the communication terminal device 10. The main control configuration of the control unit will be described later.

  The memory 102 is realized by a ROM (Read Only Memory), a RAM (Random Access Memory), and a storage device. The ROM stores a control program executed by the communication terminal device 10 in a nonvolatile manner. The RAM volatilely stores data generated by execution of a program by the CPU 100 or data input via the input device. The storage device is configured by a nonvolatile memory such as a flash memory, for example, and stores data in a nonvolatile manner. The data stored in the storage device includes various applications in addition to a program for controlling each unit of the communication terminal device 10.

  The wireless communication unit 104 performs wireless communication with a base station (not shown). Specifically, the wireless communication unit 104 connects to a wireless communication network via the communication antenna 110 and transmits / receives a signal for wireless communication. Thereby, the communication terminal device 10 can communicate with another communication terminal device 10 via a base station using a wireless communication network.

  The communication I / F 106 exchanges various data with an external device, and is realized by an adapter, a connector, or the like. As a communication method, for example, wireless communication such as Bluetooth (registered trademark) or wireless LAN (Local Area Network) may be used, or wired communication using USB (Universal Serial Bus) or the like may be used. .

  The power supply circuit 108 is a circuit that receives a supply of voltage from an external power supply such as a commercial power supply and generates a power supply voltage for each part of the communication terminal device 10.

  The touch screen 30 includes a display 32 and a touch panel 34. The display 32 includes a screen for displaying an image. The touch panel 34 receives a user input operation. The touch panel 34 detects the contact of an object such as a user's finger or stylus pen by using, for example, a capacitive type.

  The proximity sensor 40 converts the reflected light that has been reflected back from the object and the reflected light that has been reflected back from the front panel 20 into an electrical signal by the light receiving unit 44 using the infrared method. The CPU 100 acquires the output signal of the proximity sensor 40.

  The processing in the communication terminal device 10 is realized by each hardware and software executed by the CPU 100. Such software may be stored in the memory 102 in advance. The software may be stored in other storage media and distributed as a program product. Alternatively, the software may be provided as a program product that can be downloaded by an information provider connected to the so-called Internet. Such software is read from the storage medium by the reading device or downloaded via the communication I / F 106 and the like, and then temporarily stored in the memory 102 in the form of an executable program. The software is read from the memory 102 by the CPU 100 and stored in the RAM in the form of an executable program. The CPU 100 executes the program.

  Each component which comprises the communication terminal device 10 shown by the figure is general as a component of a smart phone. Therefore, it can be said that an essential part of the present embodiment is the memory 102, software stored in the memory 102, or software that can be downloaded via a network.

  FIG. 6 is a block diagram illustrating a control structure of the communication terminal device 10 according to the present embodiment. Referring to FIG. 6, communication terminal apparatus 10 includes proximity detection unit 120, detection threshold setting unit 130, control unit 140, input unit 150, proximity sensor 40, and touch panel 34.

  In the control structure shown in FIG. 6, the CPU 100 (FIG. 5) of the communication terminal device 10 basically executes the operation system and application program stored in the memory 102 and gives instructions to the components of the communication terminal device 10. It is realized by things. That is, the CPU 100 realizes a function as a control unit that comprehensively controls the operation of the communication terminal device 10.

  The input unit 150 receives an operation from the user with respect to the communication terminal device 10. The input unit 150 is realized mainly by the CPU 100 and the touch panel 34 operating in cooperation.

  The control unit 140 is a block for controlling various types of communication using the wireless communication unit 104 (FIG. 5). The control unit 140 performs data processing including transmission / reception control according to the communication protocol. The control unit 140 also generates a setting command for setting the detection threshold, and outputs the generated setting command to the detection threshold setting unit 130.

  When the detection threshold value setting unit 130 receives a setting command from the control unit 140, the detection threshold value setting unit 130 sets a detection threshold value. The detection threshold setting unit 130 outputs the set detection threshold to the proximity detection unit 120.

  The proximity detection unit 120 receives the output value of the proximity sensor 40 and receives the detection threshold from the detection threshold setting unit 130. The proximity detector 120 detects that an object is approaching the front panel 20 by comparing the output value of the proximity sensor 40 with a detection threshold value. The proximity detection unit 120 outputs a signal (detection signal) indicating the detection result to the control unit 140.

  The control unit 140 controls the touch panel 34 according to a signal sent from the proximity detection unit 120. As an aspect of control, when the proximity detection unit 120 detects that an object is approaching, the control unit 140 invalidates the input operation to the touch panel 34. Thereby, it is possible to prevent an operation unintended by the user from being performed when an object comes into contact with the touch screen 30.

  For example, when making a call using the communication terminal device 10, the user brings a speaker (not shown) provided on the front panel 20 close to or in contact with the periphery of the ear. For this reason, when the user's ear or cheek touches the touch screen 30 during a call, there is a possibility that a touch-type button (a button for accepting an operation by touch) displayed on the screen of the touch screen 30 may be erroneously operated. .

  In the present embodiment, when the approach of an object is detected based on the output value of the proximity sensor 40, the control unit 140 invalidates the operation on the touch panel 34, so that an erroneous operation during a call can be prevented. In addition, after invalidating the operation on the touch panel 34, when it is detected that an object is not approaching based on the output value of the proximity sensor 40, the control unit 140 cancels the invalidation.

  In the control structure shown in FIG. 6, the detection threshold setting command is issued, for example, when the proximity sensor 40 is activated. The proximity sensor 40 is activated when the power of the communication terminal device 10 is turned on, for example. Instead of when the power is turned on or in addition to when the power is turned on, the proximity sensor 40 may be activated when the communication terminal device 10 is activated from the standby state in response to a user input operation. Is possible. Note that the standby state refers to a state in which some operations such as the touch screen 30 are stopped for power saving.

  Alternatively, it is possible to generate a setting command every predetermined time during the operation of the proximity sensor 40. Alternatively, it may be generated when the proximity sensor 40 is stopped instead of when the proximity sensor 40 is activated. Alternatively, a setting command can be generated when the input unit 150 receives a setting request from the user.

  FIG. 7 is a flowchart for explaining the flow of detection threshold setting processing in the detection threshold setting unit 130. Note that the flowchart shown in FIG. 7 is realized by the CPU 100 executing a program stored in advance in the memory 102.

  Referring to FIG. 7, first, in order to execute the detection threshold setting process, detection threshold setting unit 130 determines whether or not a detection threshold setting command issued from control unit 140 has been received in step S01. . As described above, the detection threshold setting command is issued, for example, when the power of the communication terminal apparatus 10 is turned on or when the communication terminal apparatus 10 is activated from the standby state. If it is determined that the setting command has not been received (NO determination in S01), the detection threshold setting unit 130 ends the process. In this case, since the detection threshold is not set, the detection threshold set in the initial value or the previous setting process is used.

  On the other hand, when it is determined that the setting command has been received (when YES is determined in S01), the detection threshold setting unit 130 determines whether or not the detection threshold can be set. This determination is performed based on the output value of the touch panel 34 and the output value of the proximity sensor 40 as described below.

  As described with reference to FIG. 4, the detection threshold value setting unit 130 sets the detection threshold value based on the actual output value (base value) of the proximity sensor 40 for the purpose of eliminating the shift in the detection distance. Therefore, it is necessary to obtain an accurate base value.

  However, when setting the detection threshold, if the proximity sensor 40 is covered with an object, the output value of the proximity sensor 40 is a base value according to the distance from the main surface of the front panel 20 to the object. Higher value. Therefore, when the detection threshold is set based on the output value, the set detection threshold is higher than the detection threshold that should be set based on the base value. As a result, the deviation of the detection distance is increased, and it becomes difficult to prevent erroneous detection in the proximity sensor 40.

  Therefore, in the present embodiment, in order to obtain an accurate detection threshold, whether or not the detection threshold can be set at the beginning of the setting process, that is, the proximity sensor 40 is not covered with an object. It is determined whether or not.

  Specifically, in step S02, the detection threshold setting unit 130 is set above the proximity sensor 40 (a position slightly spaced from the opening 22 in the normal direction of the front panel 20) based on the output value of the touch panel 34. It is determined whether or not an object exists. FIG. 8 is a schematic diagram for explaining the determination operation in step S02 of FIG.

  With reference to FIG. 8, a detection area is set in a partial region near the proximity sensor 40 in the screen of the touch screen 30. A region RGN in FIG. 8 shows an example of a detection area. In the example of FIG. 8, the screen is divided into two parts in the vertical direction and divided into two parts in the left-right direction, for a total of four areas. Of these four areas, the area closest to the proximity sensor 40 is set as the detection area RGN.

  As shown in FIG. 8, it is assumed that the user's finger F exists above the proximity sensor 40. FIG. 9 is a side view of the communication terminal device 10 in this case as viewed from the direction of the arrow IX in the drawing.

  With reference to FIG. 8 and FIG. 9, the presence of the user's finger F above the proximity sensor 40 causes the finger F to approach the detection area RGN on the screen. At this time, as the finger F approaches, the capacitance in the detection area RGN changes on the touch panel 34. The detection threshold setting unit 130 determines that an object exists above the proximity sensor 40 based on the output value of the touch panel 34 in the detection area RGN. In addition, it is preferable that the determination value used for determining whether or not an object exists above the proximity sensor 40 is smaller than the determination value used for detecting the contact position of the user.

  The detection area RGN is an area for detecting the presence of an object above the proximity sensor 40. Therefore, the detection area RGN may be provided in a partial region close to the proximity sensor 40, and the shape thereof is not particularly limited. For example, as shown in FIG. 10, when the proximity sensor 40 is installed near the upper center of the front panel 20, the screen is divided in the vertical direction (two divisions in FIG. 10) and is closest to the proximity sensor 40. The region can be set as the detection area RGN.

  Returning to FIG. 7, in step S <b> 02, the detection threshold setting unit 130 determines whether an object is detected in the detection area RGN of the screen based on the output value of the touch panel 34. When an object is detected in the detection area RGN (when YES is determined in S02), the detection threshold setting unit 130 ends the process.

  On the other hand, when no object is detected in the detection area RGN (NO determination in S02), the detection threshold value setting unit 130 proceeds to step S03 and compares the output value of the proximity sensor 40 with the determination value. . The determination value is a threshold value for determining whether or not the proximity sensor 40 is covered with an object located closer to the detection distance (see FIG. 11). The determination value assumes, for example, a state in which the opening 22 is shielded by an object other than an object such as a user's finger.

  When the output value of the proximity sensor 40 is higher than the determination value (NO determination in S03), the detection threshold setting unit 130 ends the process. On the other hand, when the output value of the proximity sensor 40 is equal to or smaller than the determination value (when YES is determined in S03), the detection threshold setting unit 130 determines that the proximity sensor 40 is not covered with an object. Therefore, the detection threshold setting unit 130 sets the detection threshold based on the output value of the proximity sensor 40.

  Specifically, the detection threshold setting unit 130 first calculates the base value of the output value of the proximity sensor 40 in step S04. Specifically, when the detection threshold value setting unit 130 acquires a plurality of output values at a predetermined period, the detection threshold value setting unit 130 calculates a base value by statistically processing the plurality of output values. For example, the detection threshold setting unit 130 calculates an average value (simple average value or weighted average value) of a plurality of output values. As the statistical process, in addition to the process of calculating an average value, a process of calculating a median value of a plurality of output values or a process of calculating a mode value of a plurality of output values can be performed. Further, in the process of calculating the average value, a value obtained by excluding abnormal values from a plurality of output values may be averaged.

  In step S05, as shown in FIG. 11, the detection threshold value setting unit 130 sets a detection threshold value by adding a predetermined amount of margin to the calculated base value.

  When the detection threshold value setting process in the detection threshold value setting unit 130 described above is organized, when the detection threshold value setting unit 130 receives a detection threshold value setting command, the proximity sensor 40 determines that the proximity sensor 40 is based on the output value of the touch panel 34. It is determined whether or not it is covered with an object such as a finger (processing of S02 in FIG. 7). The detection threshold setting unit 130 further determines whether or not the proximity sensor 40 is covered with an object other than an object such as a user's finger based on the output value of the proximity sensor 40 (processing of S03 in FIG. 7). When it is determined that the proximity sensor 40 is not covered with an object based on these determination results, the detection threshold setting unit 130 sets a detection threshold based on the output value of the proximity sensor 40.

  The base value calculated by the process of S04 in FIG. 7 is a value reflecting the degree of dirt on the front panel 20. Therefore, it is possible to set an accurate detection threshold considering the influence of the reflected light from the front panel 20. As a result, it is possible to eliminate the shift in the detection distance, and thus it is possible to prevent erroneous detection of the approach of the object.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 10 Communication terminal device, 20 Front panel, 22 Opening part, 24 Transparent substrate, 26 Light shielding film, 30 Touch screen, 40 Proximity sensor, 42 Light emission part, 44 Light reception part, 50 Board | substrate, 100 CPU, 102 Memory, 104 Wireless communication part 106 communication I / F, 108 power supply circuit, 110 communication antenna, 120 proximity detection unit, 130 detection threshold setting unit, 140 control unit, 150 input unit, 200 object, 210 dirt.

Claims (5)

A communication terminal device,
A display having a screen;
A front panel disposed on the screen of the display;
A touch detection unit configured to detect contact of an object on the screen;
A proximity sensor installed in a peripheral area surrounding the screen of the front panel;
Based on the result of comparing the output value of the proximity sensor and a detection threshold, a proximity detector that detects the approach of the object to the front panel;
A detection threshold setting unit for setting the detection threshold;
The proximity sensor is
A light emitting unit that emits light toward the outside of the communication terminal device through the front panel;
A light receiving portion configured to receive light emitted from the light emitting portion and reflected by the object or the front panel and convert the light into an electrical signal;
The detection threshold setting unit outputs an output value of the proximity sensor when it is detected that the proximity sensor is not covered with the object based on an output value of the touch detection unit and an output value of the proximity sensor. A communication terminal device that sets the detection threshold based on the communication terminal device.   When it is detected that the proximity sensor is not covered with the object, the detection threshold setting unit calculates a base value in an output value of the proximity sensor, and based on the calculated base value The communication terminal device according to claim 1, wherein a detection threshold is set.   The communication terminal apparatus according to claim 2, wherein the detection threshold setting unit sets the detection threshold to a value higher than the base value.   The detection threshold setting unit is configured to cover the proximity sensor with the object based on an output value of the touch detection unit in a partial region of the screen near the proximity sensor and an output value of the proximity sensor. The communication terminal device according to any one of claims 1 to 3, which detects absence.   The detection threshold value setting unit is a case where it is detected that the partial region is not covered with the object based on an output value of the touch detection unit in the partial region, and the output of the proximity sensor The communication terminal device according to claim 4, wherein when the value is equal to or less than a determination value, the proximity sensor detects that the object is not covered with the object.

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