JP2020086175A - Display device and display control method - Google Patents

Abstract

To provide a display device of which the power consumption can be reduced without installing a dedicated illumination facility, and a display control method.SOLUTION: The display device includes a light emitting member, a housing member, a blade member, and an electric magnet. The light emitting member is a member with the emission of light controllable on the basis of a control signal. The housing member is a member including a wall in a direction orthogonal to a face of the light emitting member, with a hole opened at an end of the wall on the side opposite the light emitting member. The blade member is arranged in an opening of the housing member, is tabular and has a permanent magnet at an end of the face on the light emitting member side, and is orthogonal to the thickness direction and rotatably held by a shaft passing through the permanent magnet. The electric magnet is arranged at a position facing the permanent magnet and inside the housing member, and has switchable polarities.SELECTED DRAWING: Figure 4

Description

The present invention relates to a display device and a display control method.

A magnetic reversal type display device may be used as a device for displaying characters on a scoreboard arranged in a baseball field. The magnetic reversal type display device is one in which display elements for reversing display of blades are arranged in a matrix by magnetic force.

Each display element has a size of, for example, 3 cm×3 cm. The display element changes the display by reversing the plate-shaped blades by switching the polarity of the electromagnet. For example, the display element displays a dark color such as black before inversion and a bright color such as yellow or white after inversion. Such display elements are arranged in, for example, a 16×16 matrix. Then, the display device displays a bright color on the display elements corresponding to the pattern to be displayed among the display elements arranged in a matrix, and displays a dark color on the other display elements, thereby displaying characters and numbers. Display the specified pattern.

In such a display device, the display content can be visually recognized by reflecting the external light in the daytime or in an environment with the external light such as a room with illumination. In addition, at night or in an environment where there is no external light such as a room without illumination, the display content can be visually recognized by separately illuminating and illuminating the illuminated illumination light.

As the display device, a self-luminous dot matrix display device using an LED (Light Emitting Diode) or the like is also used. Further, a display device has been proposed in which sunlight is introduced into the housing to perform dot matrix display.

JP, 2014-215448, A Japanese Unexamined Patent Publication No. 8-221010

However, in the conventional magnetic reversal type display device, it is necessary to provide a dedicated lighting facility for lighting at night. On the other hand, the self-luminous dot matrix display device consumes more power than the magnetic reversal type display device because it is always lit. For this reason, it is difficult to reduce power consumption without providing a dedicated lighting facility.

One aspect is to provide a display device and a display control method capable of reducing power consumption without providing a dedicated lighting facility.

In one aspect, the display device includes a light emitting member, a housing member, a vane member, and an electromagnet. The light emitting member is a member capable of controlling light emission based on a control signal. The housing member is a member that has a wall in a direction orthogonal to the surface of the light emitting member, and an end portion of the wall opposite to the light emitting member is open. The blade member is arranged in the opening of the housing member, has a plate shape, and has a permanent magnet at the end of the surface on the light emitting member side, and rotates on an axis orthogonal to the thickness direction and passing through the permanent magnet. It is a member that can be held. The electromagnet is an electromagnet which is disposed inside the housing member and which faces the permanent magnet and whose polarity can be switched.

It is possible to reduce power consumption without providing a dedicated lighting facility.

FIG. 1 is a block diagram illustrating an example of the configuration of the display device according to the first embodiment. FIG. 2 is a front view of the display unit. FIG. 3 is a diagram illustrating an example of display elements for two vertical pixels of the display unit according to the first embodiment. FIG. 4 is a diagram illustrating an example of display elements for two vertical pixels of the display unit according to the first embodiment. FIG. 5 is a diagram illustrating an example of display elements for two vertical pixels of the display unit according to the first embodiment. FIG. 6 is a diagram showing an example of display in the daytime mode. FIG. 7 is a diagram showing an example of display in the night mode. FIG. 8 is a flowchart illustrating an example of the display control process according to the first embodiment. FIG. 9 is a diagram illustrating an example of display elements for two vertical pixels of the display unit according to the second embodiment. FIG. 10 is a diagram illustrating an example of display elements for two vertical pixels of the display unit according to the second embodiment. FIG. 11 is a diagram illustrating an example of display elements for two vertical pixels of the display unit according to the second embodiment.

Hereinafter, embodiments of a display device and a display control method disclosed in the present application will be described in detail with reference to the drawings. The disclosed technology is not limited to the embodiments described below. Further, the following embodiments may be combined as appropriate within a range not inconsistent with each other.

(Structure of display device)
FIG. 1 is a block diagram illustrating an example of the configuration of the display device according to the first embodiment. As shown in FIG. 1, the display device 1 includes an illuminance sensor 20, a control unit 30, and a display unit 100. The illuminance sensor 20 measures illuminance using, for example, a photodiode. The illuminance sensor 20 outputs an illuminance value indicating the measured illuminance to the control unit 30.

The control unit 30 sets the display mode of the display unit 100 based on the illuminance value input from the illuminance sensor 20. Further, the control unit 30 controls ON/OFF of the backlight of the display unit 100 and positive/negative logic of display logic according to the set display mode. Further, the control unit 30 outputs the display data acquired from the input unit or the communication unit (not shown) to the display unit 100 to display the display data.

The display unit 100 has display elements arranged in a matrix form, which switch between bright and dark display by rotating a blade member by magnetic force. FIG. 2 is a front view of the display unit. The display unit 100a shown in FIG. 2 is one of a plurality of display units that form the display unit 100. That is, the display unit 100a constitutes the display unit 100 by combining a plurality of display units.

The display unit 100a has, for example, the display elements 10 arranged in an 8×8 matrix. Although not shown, the display unit 100a has a plurality of display elements 10 arranged on a substrate and the substrate is fixed to a frame. In the display unit 100a, the display elements 10 may be arranged in a 16×16 matrix. In the display element 10, for example, the blade member 12 provided in the opening of the rectangular housing member 11 is rotated by magnetic force. The display unit 100 can display one symbol by using the plurality of display elements 10. For example, the display unit 100 can display characters and numbers.

(Structure of display element)
FIG. 3 to FIG. 5 are diagrams showing an example of display elements for two vertical pixels of the display unit in the first embodiment. 3 to 5, the structure of the display element 10 will be described by taking the display element 10 for two vertical pixels as an example. The display element 10 includes a housing member 11, a blade member 12, a color sheet 13, a light guide plate 14, an LED 15, a permanent magnet 16, an electromagnet 17, and a drive wire 18. In the plan view of FIG. 3, a part of the housing member 11 is removed so that the inside of the display element 10 can be seen.

The housing member 11 has walls on four sides in a direction orthogonal to the light guide plate 14, and an end portion of the wall opposite to the light guide plate 14 is open. That is, the housing member 11 is a rectangular member serving as a pixel boundary when the display unit 100 is viewed from the front.

The blade member 12 is a plate-shaped member and has, for example, a square surface. The blade member 12 is also called a wing. In this embodiment, the surface visible from the front side of the blade member 12 is colored by attaching a yellow color sheet 13. The color of the color sheet 13 is not limited to yellow, and white, orange, and fluorescent colors of these colors can be used. The blade member 12 has a permanent magnet 16 at one end of the surface on the light guide plate 14 side. The blade member 12 is an axis parallel to the side having the permanent magnet 16 and rotates about a rotation axis passing through the permanent magnet 16. Specifically, the blade member 12 is rotated by the repulsive force and attractive force generated with respect to the permanent magnet 16. Further, the permanent magnet 16 is arranged so that the polarity on the side facing the electromagnet 17 is reversed by the rotation of the blade member 12.

The light guide plate 14 is an example of a light emitting member. The light guide plate 14 is arranged, for example, over the plurality of display elements 10 on the display unit 100a, and the LEDs 15 are arranged at the end of the light guide plate 14. The LED 15 constitutes a backlight together with the light guide plate 14 by switching on and off based on a control signal from the control unit 30. The light guide plate 14 and the LEDs 15 may be provided for each display element 10. Further, the light emitting member may constitute a backlight by disposing a plurality of LEDs on the substrate instead of the light guide plate 14 and the LEDs 15. The light emitting color of the light emitting member (light guide plate 14) is not limited as long as it is a visible color such as white, orange, and yellow.

The electromagnet 17 is arranged inside the housing member 11 and at a position facing the permanent magnet 16. That is, the end of the electromagnet 17 that is the S pole or the N pole is oriented in the direction orthogonal to the surface of the light guide plate 14. The electromagnet 17 has an iron core and a copper wire forming a coil. A drive wire 18 is connected to the coil of the electromagnet 17, and when a current flows in a predetermined direction, a magnetic field is generated and the iron core becomes an S pole or an N pole. Further, the iron core of the electromagnet 17 has a polarity opposite to that in the case where a current flows through the coil in a direction opposite to the predetermined direction and a reverse magnetic field is generated to flow the current in the predetermined direction. The electromagnet 17 can be brought into a state in which the blade member 12 closes the opening of the housing member 11 or a state in which the opening is opened under the control of the control unit 30.

When the polarities of the permanent magnet 16 and the polarities of the end portions of the electromagnets 17 facing the permanent magnet 16 have the same bendability, the blade member 12 generates a repulsive force with respect to the permanent magnet 16, and the vane member 12 works together with the permanent magnet 16. Rotate. When the permanent magnet 16 rotates, the polarity on the side facing the electromagnet 17 is reversed, and the permanent magnet 16 has a polarity opposite to the polarity of the end of the electromagnet 17. As a result, an attractive force is generated on the permanent magnet 16, and the permanent magnet 16 stops when it rotates 90 degrees from the rotation start state. That is, the blade member 12 also stops.

In the front view and the AA′ cross-sectional view of FIGS. 4 and 5, the blade member 12 is in a state of closing the opening of the housing member 11, and the blade member 12 rotates in the inward direction of the housing member 11. This shows the display element 10b in which the opening is open.

Here, for example, when the blade member 12 is in the state of the display element 10a, that is, in the state where the polarity of the side of the permanent magnet 16 facing the electromagnet 17 is the N pole, the end portion of the side of the electromagnet 17 facing the permanent magnet 16 is increased. It is assumed that a magnetic field is generated so that the magnetic field has an N pole. In this case, the vane member 12 and the permanent magnet 16 are rotated by repulsing the permanent magnet 16 and the electromagnet 17 between the N poles, and are in the state shown in the display element 10b. The vane member 12 and the permanent magnet 16 have an S pole on the side facing the electromagnet 17 of the permanent magnet 16 at the time when the state shown in the display element 10b is reached, and face the permanent magnet 16 of the electromagnet 17 that is the N pole. The rotation stops by attracting the side end. The transition from the state of the display element 10b to the state of the display element 10a is performed in the same manner as the transition from the state of the display element 10a to the state of the display element 10b by reversing the polarity of the electromagnet 17. You can

The display element 10a and the display element 10b are in the mode corresponding to the daytime, that is, when the backlight is turned off, the display logic is set to the positive logic and the bright display and the dark display are displayed, respectively. On the other hand, in the display element 10a and the display element 10b, the display logic is set to the negative logic and represents the dark display and the bright display, respectively, in the mode corresponding to the nighttime, that is, when the backlight is turned on. That is, the display element 10 reverses the display logic between a mode corresponding to the daytime (hereinafter also referred to as a daytime mode) and a mode corresponding to the nighttime (hereinafter also referred to as a nighttime mode).

FIG. 6 is a diagram showing an example of display in the daytime mode. As shown in FIG. 6, in the display element 10 in the daytime mode, when the opening of the housing member 11 is closed by the blade member 12, the color sheet 13 on the surface of the blade member 12 is irradiated with external light. It will be displayed brightly. On the other hand, in the display element 10, when the blade member 12 rotates toward the inside of the housing member 11 to open the opening, outside light does not reach the light guide plate 14 surrounded by the wall of the housing member 11, and a dark display is performed. .. That is, the light guide plate 14 looks black because the wall of the housing member 11 functions as a shade.

FIG. 7 is a diagram showing an example of display in the night mode. As shown in FIG. 7, in the display element 10 in the night mode, when the blade member 12 rotates inward of the housing member 11 and the opening of the housing member 11 opens, the backlight turns on. Therefore, light is emitted from the light guide plate 14 to provide a bright display. On the other hand, in the display element 10, when the opening of the housing member 11 is closed by the vane member 12, the light from the light guide plate 14 is blocked, and the color sheet 13 on the surface of the vane member 12 has no external light so that a dark display is provided. Becomes

(Operation of display device)
Next, the operation of the display device 1 according to the first embodiment will be described. FIG. 8 is a flowchart illustrating an example of the display control process according to the first embodiment.

For example, the control unit 30 of the display device 1 acquires the illuminance value from the illuminance sensor 20 when the display start is instructed by the administrator (step S1). The control unit 30 determines whether or not the acquired illuminance value is a predetermined value, for example, 5000 lx or more (step S2). When determining that the illuminance value is equal to or higher than the predetermined value (step S2: Yes), the control unit 30 sets the daytime mode (step S3) and turns off the backlight of the display unit 100 (step S4). , The display logic is set to positive logic (step S5).

On the other hand, when determining that the illuminance value is less than the predetermined value (step S2: No), the control unit 30 sets the night mode (step S6) and turns on the backlight of the display unit 100 (step S6). S7), the display logic is set to negative logic (step S8).

When the display logic is set, the control unit 30 outputs the display data to the display unit 100 and displays the display data based on the set display logic (step S9). The control unit 30 determines whether to end the display, for example, based on an end instruction input by the administrator (step S10). When the control unit 30 determines not to end the display (step S10: No), the process returns to step S1. When the control unit 30 determines to end the display (step S10: Yes), the display control process ends. Thereby, the display device 1 can perform display with reduced power consumption without providing a dedicated lighting facility.

As described above, the display element 10 of the display device 1 includes the light emitting member (light guide plate 14 ), the housing member 11, the blade member 12, and the electromagnet 17. The light emitting member is a member capable of controlling light emission based on a control signal. The housing member 11 is a member that has a wall in a direction orthogonal to the surface of the light emitting member, and the end of the wall opposite to the light emitting member is open. The blade member 12 is arranged in the opening of the housing member 11, is plate-shaped, has the permanent magnet 16 at the end of the surface on the light emitting member side, and is an axis that passes through the permanent magnet 16 at right angles to the thickness direction. It is a member that is rotatably held. The electromagnet 17 is an electromagnet that is disposed inside the housing member 11 and faces the permanent magnet 16 and that can switch polarities. As a result, the display device 1 can perform display with reduced power consumption without providing a dedicated lighting facility.

Further, the blade member 12 is a plate having a square surface, and the permanent magnet 16 is arranged at an end of the surface on one side of the light emitting member. As a result, the blade member 12 can be rotated by the electromagnet 17.

The surface of the blade member 12 opposite to the surface on the light emitting member side is a color for performing bright display when the control signal is in a mode corresponding to daytime. As a result, the blade member 12 can perform bright display while closing the opening of the housing member 11.

Further, when the control signal is in the mode corresponding to the daytime, the light emitting member and the blade member 12 turn the blade member 12 so that the opening is opened to turn off the light emitting member, thereby providing a dark display and the opening portion. The surface opposite to the surface on the side of the light emitting member of the blade member 12 rotated so as to block the light is displayed brightly. Further, when the control signal is in a mode corresponding to nighttime, the light emitting member and the blade member 12 are rotated by rotating the blade member 12 so that the opening is opened, and the light emitting member is turned on to provide a bright display. The surface opposite to the surface on the side of the light emitting member of the blade member 12 rotated so as to close the window is darkly displayed. As a result, the display device 1 can perform display in both the daytime and the nighttime by reversing the display logic in the daytime mode and the nighttime mode.

The light emitting member is the light guide plate 14 or a substrate on which the light emitting diode is arranged. As a result, since light can be emitted at night, display can be performed at night.

The control signal is set to a mode corresponding to the night when the illuminance value acquired by the illuminance sensor 20 is less than a predetermined value, and a mode corresponding to the daytime when the illuminance value is equal to or more than the predetermined value. As a result, the daytime mode and the nighttime mode can be switched according to the ambient brightness.

A plurality of display elements 10 each having a light emitting member, a housing member 11, a blade member 12, and an electromagnet 17 are mounted side by side on a single substrate, and the light emitting members of the plurality of display elements 10 on the substrate emit light. Control with one control signal. As a result, the display unit 100 as a whole can be easily switched between the daytime mode and the nighttime mode.

9 to 11 are diagrams illustrating an example of a display element for two vertical pixels of the display unit according to the second embodiment. The display element 50 of the second embodiment has higher visibility than the display element 10 of the first embodiment by widening the opening of the housing member. The same components as those of the display element 10 of the first embodiment are designated by the same reference numerals, and the description of the overlapping components and operations will be omitted. In the plan view of FIG. 9, a part of the housing member 51 is removed so that the inside of the display element 50 can be seen.

The display element 50 includes a housing member 51, a blade member 52, a color sheet 53, a light guide plate 14, an LED 15, a permanent magnet 56, an electromagnet 17, and a drive wire 18.

The housing member 51 has walls on four sides in a direction orthogonal to the light guide plate 14, and an end of the wall opposite to the light guide plate 14 is open. As shown in FIGS. 10 and 11, the housing member 51 is a member whose opening is larger than that of the housing member 11 of the first embodiment. The housing member 51 is, for example, a rectangular member whose longitudinal length is longer than that of the housing member 11 when the display unit 100 is viewed from the front. Further, the housing member 51 is provided with a guide rail 54 for assisting the movement of the blade member 52.

The blade member 52 is formed by connecting blade members 52a and 52b, which are plate-shaped members, with a hinge 52c. Further, a projection 52d that moves along the guide rail 54 is provided at an end portion of the blade member 52a opposite to the hinge 52c. The blade member 52 is also referred to as a wing like the blade member 12 of the first embodiment. In this embodiment, the surfaces visible from the front side of the blade members 52a and 52b are colored by attaching yellow color sheets 53a and 53b. When the color sheets 53a and 53b are not distinguished from each other, they are referred to as the color sheet 53.

The blade member 52b has a permanent magnet 56 at the end opposite to the hinge 52c. The blade member 52b is an axis that is parallel to the side having the permanent magnet 56, and rotates about a rotation axis that passes through the permanent magnet 56. Specifically, the blade member 52b is rotated by the repulsive force and attractive force generated with respect to the permanent magnet 56. Further, the permanent magnet 56 is arranged so that the polarity on the side facing the electromagnet 17 is reversed by the rotation of the blade member 52b. Further, when the blade member 52b rotates, the blade member 52a moves toward the inside of the housing member 51 at the end on the hinge 52c side together with the end of the blade member 52b. Further, the blade members 52a and 52b are folded so that the color sheets 53a and 53b face each other by the protrusion 52d moving along the guide rail 54.

When the polarity of the permanent magnet 56 and the polarity of the end of the electromagnet 17 facing the permanent magnet 56 have the same bendability, the blade member 52b generates a repulsive force with respect to the permanent magnet 56, and together with the permanent magnet 56. Rotate. When the permanent magnet 56 rotates, the polarity on the side facing the electromagnet 17 is inverted, and the permanent magnet 56 has a polarity opposite to the polarity of the end portion of the electromagnet 17. As a result, an attractive force is generated with respect to the permanent magnets 56, and the permanent magnets 56 stop when they rotate 90 degrees from the rotation start state. That is, the blade member 52b and the blade member 52a moved via the hinge 52c also stop.

In the front view and the BB′ cross-sectional view of FIGS. 10 and 11, the display element 50a in which the blade member 52 closes the opening of the housing member 51 and the blade member 52 are folded inward of the housing member 51. The display element 50b is in a state in which the opening is opened.

Here, for example, when the blade member 52 is in the state of the display element 50a, that is, in the state where the polarity of the side of the permanent magnet 56 facing the electromagnet 17 is the N pole, the end of the side of the electromagnet 17 facing the permanent magnet 56. It is assumed that a magnetic field is generated so that the magnetic field has an N pole. In this case, the vane member 52 and the permanent magnet 56 are in the state shown in the display element 50b due to the permanent magnet 56 and the electromagnet 17 rotating by repulsion between the N poles. The vane member 52 and the permanent magnet 56 have an S pole on the side facing the electromagnet 17 of the permanent magnet 56 at the time when the state shown in the display element 50b is reached, and face the permanent magnet 56 of the electromagnet 17 that is the N pole. The rotation stops by attracting the side end. The transition from the state of the display element 50b to the state of the display element 50a is performed in the same manner as the transition from the state of the display element 50a to the state of the display element 50b by reversing the polarity of the electromagnet 17. You can

In the daytime mode, that is, when the backlight is off, the display element 50a and the display element 50b have the display logic as positive logic and represent bright display and dark display, respectively. On the other hand, in the nighttime mode, that is, when the backlight is on, the display element 50a and the display element 50b have a negative display logic and represent dark display and bright display, respectively.

In this way, the blade member 52 of the display element 50 is divided by the axis parallel to the axis passing through the permanent magnet 56, and the divided axis moves to the light emitting member side, so that the divided blade member 52 of the blade member 52 side. It is foldable so that the surfaces opposite to the surfaces of are overlapped with each other. As a result, the opening of the housing member 51 can be widened, and the visibility can be further increased.

1 Display Device 10,50 Display Element 11,51 Housing Member 12,52,52a, 52b Blade Member 13,53,53a,53b Color Sheet 14 Light Guide Plate 15 LED
16,56 Permanent magnet 17 Electromagnet 18 Drive wire 20 Illuminance sensor 30 Control part 52c Hinge 52d Protrusion 54 Guide rail 100,100a Display unit

Claims (9)

A light emitting member capable of controlling light emission based on a control signal,
A housing member having a wall in a direction orthogonal to the surface of the light emitting member, and an end portion of the wall opposite to the light emitting member being open;
It is arranged in the opening of the housing member, is plate-shaped, has a permanent magnet at the end of the surface on the light emitting member side, and is rotatably held by a shaft that is orthogonal to the thickness direction and passes through the permanent magnet. Blade member,
Inside the housing member, an electromagnet arranged at a position facing the permanent magnet and capable of switching polarities,
A display device having: The vane member is a plate having a square surface, and the permanent magnet is arranged at an end portion of a surface on the light emitting member side of any side,
The display device according to claim 1, wherein the display device is a display device. The vane member has a surface opposite to the surface on the light emitting member side, which is a color for performing bright display when the control signal is in a mode corresponding to daytime,
The display device according to claim 1, wherein the display device is a display device. When the control signal is in the mode corresponding to the daytime, the light emitting member and the blade member are darkened by rotating the blade member to turn off the light emitting member so that the opening is opened, When the control signal is in a mode corresponding to nighttime, the opening is opened so that the surface opposite to the light emitting member side surface of the blade member rotated so as to close the opening is displayed brightly. A bright display is obtained by rotating the blade member to turn on the light emitting member, and a surface opposite to the light emitting member side surface of the blade member rotated so as to close the opening is darkly displayed.
The display device according to claim 3, wherein: The light emitting member is a light guide plate or a substrate on which a light emitting diode is arranged,
The display device according to claim 1, wherein the display device is a display device. The control signal is a mode corresponding to the night when the illuminance value acquired by the illuminance sensor is less than a predetermined value, and a mode corresponding to the daytime when the illuminance value is a predetermined value or more,
The display device according to claim 1, wherein the display device is a display device. The vane member is divided by an axis parallel to the axis passing through the permanent magnet, and the divided axis moves to the light emitting member side so that the surface opposite to the light emitting member side of the divided blade member is Foldable to overlap each other,
The display device according to claim 1, wherein the display device is a display device. A plurality of display elements having the light emitting member, the housing member, the vane member, and the electromagnet are mounted side by side on one substrate, and the light emitting members of the plurality of display elements on the substrate emit light. Controlled by one of the control signals,
The display device according to claim 1, wherein the display device is a display device. A display control method for controlling a display element having a light emitting member capable of controlling light emission based on a control signal, and a blade member capable of shielding the light emission,
When the control signal is in a mode corresponding to the daytime, the blade member is rotated so that the opening of the display element is opened to turn off the light emitting member to provide a dark display and close the opening. When the surface opposite to the light emitting member side of the blade member rotated in the above is brightly displayed, and when the control signal is in a mode corresponding to night, the blade member is rotated so that the opening is opened. Brightening is performed by turning on the light emitting member, and dark display is provided on a surface opposite to the light emitting member side surface of the blade member rotated so as to close the opening.
A display control method characterized by the above.

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