Patent Description:
The mainstream of an information display apparatus that includes a flexible rollable sheet display has a structure in which the display is deployed only in operation, for example, in order to protect the flexible display. For example, Patent Literature <NUM> discloses a rollable display in which, when the display is not completely taken up after a specified period of time has elapsed since the take-up was started, the take-up is stopped and a power-saving mode is started to prevent the display from being broken. Patent Literature <CIT> discloses a display device which includes a first rotation member configured to rotate, a second rotation member configured to rotate, the second rotation member being spaced apart from the first rotation member, a conveyance member that is extended between the first rotation member and the second rotation member, is configured to be conveyed between the first rotation member and the second rotation member in accordance with respective rotations of the first rotation member and the second rotation member, and has an inner surface and an outer surface, an abutting movement member that is disposed between the first rotation member and the second rotation member, and is configured to move to cause the conveyance member to be partially pushed up while being abutted against the inner surface, and a display member having flexibility that is attached to the outer surface, and displays an image using an organic light emitting phenomenon. Patent Literature <CIT> discloses an integrated projector, which comprises a projection part, a curtain, an accommodating part, a lifting part, a sensing part and a control part. The projection part is used for projecting light to the curtain to form a projection picture. The accommodating part and the projection part are connected to form an integrated structure. The curtain has a retracting state in which the curtain is accommodated in the accommodating part and an unfolding state in which the curtain is stretched out of the accommodating part by the lifting part. The sensing part is used for sensing the sliding resistance of a sliding support, and when the sliding resistance sensed by the sensing part exceeds a preset threshold, the control part stops the lifting part from driving the curtain to do telescopic motion.

Patent Literature <NUM>: <CIT> (paragraph [<NUM>]).

However, a flexible rollable sheet display section may be used in the environment in which the display section is constantly exposed to danger of a breakage accident such as being hit by the wind, or being greatly deformed or subjected to the impact due to, for example, being brought into contact with an obstacle. A breakage prevention technology used to cope with, for example, such a case has not been sufficient in the past.

In view of the circumstances described above, it is an object of the present technology to provide an information display apparatus that makes it possible to avoid occurrence of a breakage accident and can be safely used outdoors, a method for controlling the information display apparatus, and an information processing apparatus.

It is provided an information display apparatus, a method for controlling an information display apparatus and an information processing apparatus. Further aspects are set out in the appended set of claims.

In order to solve the issues described above, an information display apparatus according to the present technology includes a sheet display section; a mechanical mechanism that moves the display section, and switches a state of the display section between a deployment state in which a display space is formed and a non-deployment state in which the display space is not formed; a motion sensor that detects a motion of the display section; and a controller that calculates, from data of the detection performed by the motion sensor, at least motion information other than a component related to the movement of the display section that is performed by the mechanical mechanism, and determines an anomaly.

The information display apparatus according to the present technology has such a configuration, and this makes it possible to detect, in real time, a state that may cause a breakage of the display section. This results in being able to effectively avoid causing damage to the information display apparatus, and thus to prolong the life of the information display apparatus.

The sheet display section may be plastically deformable, and the mechanical mechanism may be configured to take up the display section from a side of an end of the display section, and to move the display section.

The controller may be configured to stop the movement of the display section that is performed by the mechanical mechanism when the controller determines the anomaly during the movement of the display section that is performed by the mechanical mechanism.

The motion sensor may be a sensor that detects at least one of acceleration or an angular velocity.

Further, the controller may be configured to control sensitivity of the motion sensor according to an operation state of the mechanical mechanism.

The controller may be configured to set the sensitivity of the motion sensor to be lower during the movement of the display section that is performed by the mechanical mechanism than when the display section is not being moved.

The controller is configured to determine the anomaly with respect to data obtained by removing a component of a frequency of oscillation of the mechanical mechanism from the data of the detection performed by the motion sensor.

Alternatively, the controller may be configured to start determining the anomaly when the movement of the display section that is performed by the mechanical mechanism is started and to stop determining the anomaly when the movement of the display section that is performed by the mechanical mechanism is stopped.

Further, the controller is configured to turn the display section off when the controller determines the anomaly in a state in which the display section is on.

The controller may be configured to determine the anomaly when the display section is in the deployment state and when the controller detects an external tension force exerted in a direction in which the display section is moved such that the state of the display section is shifted from the non-deployment state to the deployment state. For example, the controller may be configured to detect the tension force on the basis of an amount of reverse rotation of a motor of the mechanical mechanism.

A method for controlling an information display apparatus according to the present technology is a method for controlling an information display apparatus that is capable of moving a sheet display section and of switching a state of the display section between a deployment state in which a display space is formed and a non-deployment state in which the display space is not formed, the method including: detecting, by a motion sensor, a motion of the display section; calculating, from data of the detection performed by the motion sensor, at least motion information other than a component related to the movement of the display section that is performed by the mechanical mechanism; and determining an anomaly.

An information processing apparatus according to the present technology includes a controller that acquires data of detection performed by a motion sensor from an information display apparatus that includes a sheet display section; a mechanical mechanism that moves the display section, and switches a state of the display section between a deployment state in which a display space is formed and a non-deployment state in which the display space is not formed; and the motion sensor detecting a motion of the display section, the controller calculating, from the acquired detection data, at least motion information other than a component related to the movement of the display section that is performed by the mechanical mechanism, and determining an anomaly.

Embodiments of the present technology will now be described below on the basis of the drawings.

<FIG> is an appearance perspective view illustrating a configuration of an information display apparatus <NUM> of a first embodiment according to the present technology.

As illustrated in the figure, the information display apparatus <NUM> includes a plastically deformable sheet display section <NUM>. An end of the display section <NUM> is locked into a roller section <NUM> of a roll-up mechanism <NUM> that is a mechanical mechanism. For example, when the display section <NUM> has a rectangle shape, a side of the rectangle shape is locked into the roller section <NUM> of the roll-up mechanism <NUM>. In the present embodiment, the sheet display section <NUM> is upwardly rolled up by the roll-up mechanism <NUM>. Accordingly, the display section <NUM> is supported in a state of being hung from the roller section <NUM> of the roll-up mechanism <NUM>.

The sheet display section <NUM> hung from the roller section <NUM> of the roll-up mechanism <NUM> by an upper end of the display section <NUM> being locked into the roller section <NUM> can be moved between a state of being taken up by the roller section <NUM> and a state of being pulled out of the roller section <NUM>. Here, the display section <NUM> in a state of being pulled out of the roller section <NUM> forms a space for displaying information. Thus, this state corresponds to a "deployment state" according to an embodiment of the present technology, and a state in which the display section <NUM> is taken up by the roller section <NUM> and the space for displaying information is not formed corresponds to a "non-deployment state" according to the embodiment of the present technology.

In a state in which the information display apparatus <NUM> is in operation, that is, in the deployment state of the display section <NUM>, a weight member <NUM> is attached to a lower portion of the display section <NUM> in order to downwardly appropriately tension the sheet display section <NUM> pulled out of the roller section <NUM> to remove bending of a display screen. More specifically, a display sheet 11b that includes a display element is superimposed on one of surfaces of a support sheet 11a of a dark color such as black, and is bonded to the support sheet 11a. Accordingly, the sheet display section <NUM> is formed. The sheet display section <NUM> is supported by one of ends of the support sheet 11a being attached to the roller section <NUM> of the roll-up mechanism <NUM>.

The roll-up mechanism <NUM> includes, for example, the roller section <NUM>, a motor <NUM> that drives the roller section <NUM>, and a roller drive mechanism (not illustrated) including, for example, a transmission gear. For example, the roll-up mechanism <NUM> is attached to another heavy construction such as a building through an attachment frame (not illustrated).

A motion sensor <NUM> that detects a motion of the display section <NUM> that is other than a motion that occurs due to the display section <NUM> being rolled up by the roll-up mechanism <NUM>, is arranged in the information display apparatus <NUM>. For example, an acceleration sensor and a gyroscope are used as the motion sensors <NUM>. These sensors detect an unexpected motion, such as swing or oscillation of the display section <NUM>, that occurs due to external force. For example, the display section <NUM> in operation can move in various directions at various speeds due to wind or collision of an obstacle. When such an unexpected motion of the display section <NUM> is repeated, the display section <NUM> itself or a support connection portion of the display section <NUM> is subjected to stress. Consequently, there is an increase in the probability of suffering damage such as deformation or a breakage, and this may result in significantly shortening the life.

In the information display apparatus <NUM> of the present embodiment, motion information other than a component of a steady oscillation of the display section <NUM> is calculated from detection data of the display section <NUM> that is detected by the motion sensor <NUM>, and an anomaly is determined on the basis of the motion information. When an anomalous motion is determined, control is performed to avoid causing damage to the information display apparatus <NUM>.

<FIG> is a block diagram illustrating a functional configuration of the information display apparatus <NUM> of the present embodiment.

As illustrated in the figure, the information display apparatus <NUM> includes, for example, the motion sensor <NUM>, a main central processing unit (CPU) <NUM>, a video processing circuit <NUM>, the display section <NUM>, a sound processing circuit <NUM>, a speaker <NUM>, a light emitting diode (LED) display section <NUM>, a motor driver <NUM>, and the motor <NUM> of the roll-up mechanism <NUM>. The main CPU <NUM> includes a status storage <NUM>.

The motion sensor <NUM> is a sensor, such as an acceleration sensor and a gyroscope, that detects a motion of the display section <NUM>. The motion sensor <NUM> is arranged in, for example, the weight member <NUM> provided to the lower portion of the display section <NUM>. It is favorable that at least one motion sensor <NUM> be arranged at at least one location, such as in at least one weight member <NUM>, in the display section <NUM>.

The motor driver <NUM> supplies driving power to the motor <NUM> of the roll-up mechanism <NUM> on the basis of a control instruction given by the main CPU <NUM>. Further, the motor driver <NUM> can convert, into a digital signal, a signal from, for example, a Hall element provided to the motor <NUM> and output the digital signal to the main CPU <NUM> as data of an amount of rotation.

The status storage <NUM> is a storage that holds various statuses of the information display apparatus <NUM>. The status storage <NUM> includes, for example, a random access memory (RAM). The status storage <NUM> holds a combination of anomaly detection bits, motor operation bits, and a panel-power-source bit as a group of status bits.

<FIG> illustrates a configuration of the status storage <NUM> managing the above-described respective statuses of the information display apparatus <NUM> using bit information. The status storage <NUM> holds two groups of status bits that are a current group of status bits and a previous group of status bits. The anomaly detection bits include two bits. "<NUM>" represents "no anomaly", "<NUM>" represents "contact" (anomaly), "<NUM>" represents "swing" (anomaly), and "<NUM>" represents "tension" (anomaly).

The motor operation bits include two bits. "<NUM>" represents "stop", "<NUM>" represents "normal rotation", and "<NUM>" represents "reverse rotation".

The panel-power-source bit includes one bit. "<NUM>" represents "off" of a panel power source, and "<NUM>" represents "on" of the panel power source. When the panel power source is turned on, the display section <NUM> enters an image-display state.

The main CPU <NUM> performs processing on data of detection performed by the motion sensor <NUM> and on data of an amount of rotation from the motor driver <NUM>, and determines whether an anomaly has occurred and the type of anomaly. When an anomaly is determined, the main CPU <NUM> performs control such that a safe operation is performed according to a status of the information display apparatus <NUM> in order to avoid causing damage to the information display apparatus <NUM> due to the anomaly.

The video processing circuit <NUM> generates image information to be displayed on the display section <NUM>, on the basis of a display instruction given by the main CPU <NUM>. When the main CPU <NUM> determines, in a state in which an image is being displayed on the display section <NUM> (in a state in which the panel power source is on), that an anomaly has occurred, the main CPU <NUM> performs control such that power supply to the display section <NUM> is turned off. Consequently, the display section <NUM> is electrically disconnected, and this makes it possible to avoid causing a more serious accident such as a short-circuiting accident in case that the display section <NUM> is broken due to external impact.

The sound processing circuit <NUM> generates a sound signal to be output to the speaker <NUM>, on the basis of a sound instruction given by the main CPU <NUM>. When the main CPU <NUM> determines an anomaly, the main CPU <NUM> controls the sound processing circuit <NUM> such that a sound message indicating occurrence of the anomaly is output.

The LED display section <NUM> presents occurrence of an anomaly by light emission of an LED. When the main CPU <NUM> determines an anomaly, the main CPU <NUM> controls the LED display section <NUM> such that occurrence of the anomaly is reported.

Next, a flow of processing performed by the information display apparatus <NUM> of the present embodiment is described.

<FIG> is a flowchart illustrating a flow of control performed by the information display apparatus <NUM> of the present embodiment.

When the display section <NUM> is in the deployment state in which the display section <NUM> is pulled out to form a display space, the main CPU <NUM> acquires data of detection performed by the motion sensor <NUM>, and data of an amount of rotation from the motor driver <NUM> (Step S101).

Note that, in this example, an acceleration sensor and a gyroscope are assumed to be used as the motion sensor <NUM>.

The main CPU <NUM> determines a status of a motor operation (stop / normal rotation / reverse rotation) on the basis of the data of an amount of rotation from the motor driver <NUM>, and sets, in the status storage <NUM>, two bits corresponding to the status of the motor operation (Step <NUM>).

Subsequently, the main CPU <NUM> calculates acceleration and an angular velocity from the data of detection performed by the motion sensor <NUM>, and determines, from a result of the calculations, whether an anomaly has occurred and the type of anomaly (contact / swing / tension) (Steps S103 to S105).

<FIG> is a diagram used to describe a method for determining an anomaly on the basis of acceleration and an angular velocity.

The figure is a graph in which properties of various oscillations are mapped to a space, where a horizontal axis represents acceleration, and a vertical axis represents an angular velocity.

Examples of an oscillation that occurs in the information display apparatus <NUM> include a steady oscillation due to, for example, an operation of rolling up the display section <NUM> that is performed by the roll-up mechanism <NUM> or due to the speaker <NUM>; and unexpected oscillations such as an oscillation that occurs due to, for example, wind and of which a swing width is relatively large, and an oscillation that occurs due to a relatively great impact caused by, for example, being brought into contact with an external obstacle.

In the present embodiment, an angular-velocity threshold used to detect an oscillation of a large swing width, and an acceleration threshold used to detect a large impact are set in advance. With respect to an angular velocity and acceleration that are output by the motion sensor <NUM>, the main CPU <NUM> determines a magnitude relationship between the angular velocity and the corresponding threshold, and a magnitude relationship between the acceleration and the corresponding threshold (Steps S103 and S104). When it has been determined, as a result of the determinations of the magnitude relationships, that the angular velocity and the acceleration do not reach their respective thresholds, the main CPU <NUM> determines that there is no anomaly, and repeats the comparison of subsequently acquired pieces of detection data to the respective thresholds. Further, when at least one of the acceleration or the angular velocity reaches the corresponding threshold, it is determined that "there is an anomaly". As the determined anomalies, there are an anomaly due to "contact" indicating that the acceleration exceeds the corresponding threshold, and an anomaly due to "swing" indicating that the angular velocity exceeds the corresponding threshold although the acceleration does not exceed the corresponding threshold. Thus, when the main CPU <NUM> has determined that the acceleration exceeds the corresponding threshold, the main CPU <NUM> detects "contact" (Yes in Step S103), and when the main CPU <NUM> has determined that the angular velocity exceeds the corresponding threshold although the acceleration does not exceed the corresponding threshold, the main CPU <NUM> detects "swing" (Yes in Step S104).

During a period of time during which the display section <NUM> is in the deployment state, the main CPU <NUM> calculates an amount of reverse rotation of the motor <NUM> on the basis of data acquired from the motor driver <NUM>. On the basis of the calculated amount of reverse rotation of the motor <NUM>, the main CPU <NUM> determines an anomaly due to "tension" that is caused by an external tension force exerted in a direction in which the display section <NUM> is moved such that the state of the display section <NUM> is shifted from the non-deployment state to the deployment state (Step S105). This determination is performed by determining whether, for example, the calculated amount of reverse rotation of the motor <NUM> exceeds a predetermined threshold. When the calculated amount of reverse rotation of the motor <NUM> is greater than the threshold, the main CPU <NUM> determines an anomaly due to "tension" has occurred in the display section <NUM> (Yes in Step S105).

When the main CPU <NUM> has determined one of the anomalies due to "contact" / "swing" / "tension", the main CPU <NUM> sets, in the status storage <NUM>, anomaly detection bits of two bits that correspond to the type of the anomaly (Step S106).

Next, the main CPU <NUM> sets, in the status storage <NUM>, a panel-power-source bit that corresponds to a current state of the panel power source (Step <NUM>).

Next, according to the motor operation bits and panel-power-source bit set in the status storage <NUM>, the main CPU <NUM> performs control such that a safe operation of the information display apparatus <NUM> is performed (Step S108).

<FIG> illustrates control on a safe operation depending on motor operation bits and a panel-power-source bit. Note that, in the figure, a value of current anomaly detection bits is represented by "x". In other words, the control on a safe operation is performed on the basis of motor operation bits and a panel-power-source bit, regardless of anomaly detection bits in the status storage <NUM>.

As illustrated in <FIG>, when the current motor operation bits are "<NUM>" (= stop) and when the panel-power-source bit is "<NUM>" (= off), the main CPU <NUM> does nothing (Step S108a).

When the motor operation bits are "<NUM>" (= normal rotation) and when the panel-power-source bit is "<NUM>" (= off), or when the motor operation bits are "<NUM>" (= reverse rotation) and when the panel-power-source bit is "<NUM>" (= off), the main CPU <NUM> stops a motor operation (a normal rotation or a reverse rotation) and performs control such that the LED display section <NUM> and the speaker <NUM> report occurrence of an anomaly (Step S108b).

When the motor operation bits are "<NUM>" (= stop) and when the panel-power-source bit is "<NUM>" (= on), the main CPU <NUM> turns the panel power source off, and performs control such that the above-described reports of occurrence of an anomaly are performed (Step S108c).

When the motor operation bits are "<NUM>" (= normal rotation) and when the panel-power-source bit is "<NUM>" (= on), or when the motor operation bits are "<NUM>" (= reverse rotation) and when the panel-power-source bit is "<NUM>" (= on), the main CPU <NUM> stops the motor operation, turns the panel power source off, and performs control such that the above-described reports of occurrence of an anomaly are performed (Step S108d).

Returning to <FIG>, with respect to a current set of anomaly detection bits, motor operation bits, and a panel-power-source bit that is set in the status storage <NUM>, the main CPU <NUM> shifts its value from a current value to a previous value (Step S109). Thereafter, the main CPU <NUM> enters a state of waiting for a return command (Step S110). In response to the return command being received, the main CPU <NUM> returns to Step S101, and acquires latest detection data for anomaly determination from the motion sensor <NUM>.

When none of the anomalies due to "swing", "contact", and "tension" are determined in Steps S103 to S105 due to an anomaly being removed by the above-described control on a safe operation, the main CPU <NUM> performs control such that the information display apparatus <NUM> gets back into operation, on the basis of a set of motor operation bits and a panel-power-source bit that is set in the status storage <NUM> as a previous value (Step S113).

<FIG> is a flowchart of control performed such that the information display apparatus <NUM> gets back into operation.

As illustrated in the figure, when the motor operation bits are "<NUM>" (= stop) and when the panel-power-source bit is "<NUM>" (= off), the main CPU <NUM> does nothing (Step S112a).

When the motor operation bits are "<NUM>" (= normal rotation) and when the panel-power-source bit is "<NUM>" (= off), the main CPU <NUM> terminates the above-described reports of occurrence of an anomaly, and performs control such that the motor operation of a normal rotation is restarted (Step S112b).

When the motor operation bits are "<NUM>" (= reverse rotation) and when the panel-power-source bit is "<NUM>" (= off), the main CPU <NUM> terminates the above-described reports of occurrence of an anomaly, and performs control such that the motor operation of a reverse rotation is restarted (Step S112c).

When the motor operation bits are "<NUM>" (= stop) and when the panel-power-source bit is "<NUM>" (= on), the main CPU <NUM> terminates the above-described reports of occurrence of an anomaly, and performs control such that the panel power source is turned on (Step S112d).

When the motor operation bits are "<NUM>" (= normal rotation) and when the panel-power-source bit is "<NUM>" (= on), the main CPU <NUM> terminates the above-described reports of occurrence of an anomaly, and performs control such that the motor operation of the normal rotation is restarted and the panel power source is turned on (Step S112e).

When the motor operation bits are "<NUM>" (= reverse rotation) and when the panel-power-source bit is "<NUM>" (= on), the main CPU <NUM> terminates the above-described reports of occurrence of an anomaly, and performs control such that the motor operation of the reverse rotation is restarted and the panel power source is turned on (Step S112f).

Note that, in the above-described control on a return operation, the length of a period of time for reports of occurrence of an anomaly that are performed by the LED display section <NUM> and the speaker <NUM>, is determined in advance. When, upon starting control performed for getting back into operation, the reports of occurrence of an anomaly have been terminated due to the period of time for performing the reports being over, only a motor operation is restarted and a panel power source is turned on again in the control on a return operation.

The following are triggers for generating a return command.

A norm may be used to calculate evaluation values of acceleration and an angular velocity.

With respect to data of detection performed in directions of three axes of x, y, and z that is periodically acquired from the motion sensor <NUM>, the main CPU <NUM> calculates a norm, and compares a value of the norm to a threshold to determine an anomaly. This makes it possible to obtain data of detection performed for any period of time without taking an initial pose of the motion sensor <NUM> into consideration.

<FIG> is a diagram used to describe a method for selecting data of detection performed by the motion sensor <NUM> that is adopted in the information display apparatus <NUM> of the present embodiment in order to reduce an effect of noise included in the detection data.

When, from among pieces of detection data output from the motion sensor <NUM> for, for example, every <NUM>/(n*<NUM>) seconds, pieces of data output for every <NUM>/<NUM> seconds are adopted to calculate acceleration and an angular velocity, the main CPU <NUM> selects a piece of detection data of which a value is around a (n/<NUM>)-th largest value of values of the adopted pieces of data, in order to reduce an effect of noise included in output of the sensor. <FIG> illustrates an example in which a piece of data of a seventh largest value is selected when <NUM> pieces of detection data are output from the motion sensor <NUM> for every <NUM>/<NUM> seconds.

Alternatively, each average of the <NUM> pieces of detection data output for every <NUM>/<NUM> seconds may be adopted for the calculation.

In the descriptions above, the main CPU <NUM> included in the information display apparatus <NUM> determines an anomaly and performs control depending on the determination of the anomaly. However, the control may be performed by a CPU of an information processing apparatus such as a server apparatus that is connected to the information display apparatus <NUM> through a wired or wireless network.

In the embodiments described above, the main CPU <NUM> constantly monitors detection output from the motion sensor <NUM> and the motor driver <NUM> to detect an anomaly. However, an anomaly may be determined on the basis of data of detection performed by the motion sensor <NUM>, only when the motor is in operation or when the panel power source is on. This makes it possible to suppress power consumption of the information display apparatus <NUM>.

In the embodiments described above, with respect to an angular velocity and acceleration that are output by the motion sensor <NUM>, the main CPU <NUM> determines a magnitude relationship between the angular velocity and a corresponding threshold, and a magnitude relationship between the acceleration and a corresponding threshold, and determines whether there is an anomaly on the basis of a result of the determination. Here, the respective thresholds of acceleration and an angular velocity may be changed according to an operation state of the motor <NUM>. For example, it is conceivable that, in order to reduce an effect of a component of oscillation of the motor <NUM>, the respective thresholds of acceleration and an angular velocity could be made larger and the sensitivity of the motion sensor <NUM> could be made lower when the motor <NUM> is in operation, compared to when the motor <NUM> is stopped.

Further, the main CPU <NUM> may determine an anomaly on the basis of information obtained by removing a primary component of a frequency of oscillation of the motor <NUM> from data of detection performed by the motion sensor <NUM>. This makes it possible to prevent determination of an anomaly from being adversely affected by oscillation of the motor <NUM>, and thus to improve the accuracy.

Furthermore, upon starting the motor <NUM> and upon stopping the motor <NUM>, the main CPU <NUM> may stop an anomaly determination performed on the basis of data of detection performed by the motion sensor <NUM>, in order to not determine an anomaly from oscillation that occurs upon starting the motor <NUM> and upon stopping the motor <NUM>. The above-described provision of a temporal dead band makes it possible to prevent determination of an anomaly from being adversely affected by oscillation that occurs upon starting the motor <NUM> and upon stopping the motor <NUM>, and thus to improve the accuracy.

Note that the present technology is not limited to being applied to the information display apparatus <NUM> having a structure in which the display section <NUM> is upwardly rolled up. For example, the present technology may be applied to an information display apparatus that has a configuration in which the display section <NUM> is moved from side to side or back and forth.

Further, in the present technology, the display section <NUM> is not limited to being plastically deformable. For example, the present technology may also be applied to a configuration in which the display section <NUM> in the form of a plate is accommodated in a case when the display section <NUM> is not in operation, and is mechanically pulled out of the case when the display section <NUM> is in operation.

Claim 1:
An information display apparatus (<NUM>), comprising:
a sheet display section (<NUM>);
a mechanical mechanism (<NUM>) configured to move the display section (<NUM>), and to switch a state of the display section (<NUM>) between a deployment state in which a display space is formed and a non-deployment state in which the display space is not formed;
a motion sensor (<NUM>) configured to detect a motion of the display section (<NUM>); and
a controller (<NUM>) configured to calculate, from data of the detection performed by the motion sensor (<NUM>), at least motion information other than a component related to the movement of the display section that is performed by the mechanical mechanism (<NUM>), and
to determine an anomaly,
characterized in that the anomaly comprises an oscillation of a swing of the display section (<NUM>); and
the controller (<NUM>) being further configured to determine the anomaly with respect to data obtained by removing a component of a frequency of oscillation of the mechanical mechanism (<NUM>) from the data of the detection performed by the motion sensor (<NUM>); and
the controller (<NUM>) being configured to turn the display section (<NUM>) off when the controller (<NUM>) determines the anomaly in a state in which the display section (<NUM>) is on.