JPH08202303A - Rotary after-image type display device - Google Patents

Abstract

PURPOSE: To obtain a display of variable information usable as a display for interior use by forming the display which is made visible from the entire circumference, is inexpensive and is capable of dealing with a trend toward a higher density and coloration by plural light emitting element arrays arranged on a rotary cylinder. CONSTITUTION: The light emitting element arrays 3 are arranged parallel with the axis of rotation of the cylinder 2 connected to a driving means and evenly on the circumference around this cylinder. A synchronous light emission control means 4 is installed in the inside part of the cylinder and a cover 5 is formed transparent in the necessary parts to make the light emission visible from outside. As a result, the information of the luminance visible from the entire circumference and sufficiently usable in the daytime as well is made displayable. The expression of the display having the increased information quantity with the device of the same size is made possible and the sufficient dealing with coloration is possible as well. Such display is formable with the extremely small number of elements.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pointing device for variable information by a moving light source arranged in a cylinder in the fields of display; advertisement; sign (hereinafter referred to as display etc.).

[0002]

2. Description of the Related Art As a conventional display device, light emitting diodes (hereinafter referred to as LEDs) are arranged in a matrix on a plane,
Generally, variable information is displayed by arbitrarily emitting light.

Alternatively, as disclosed in Japanese Unexamined Patent Publication No. Hei 2-61693 and Unexamined Japanese Utility Model Publication No. Hei 6-43687, there are some which utilize afterimages.

[0004]

In the conventional flat-panel display device, since all the methods are designed mainly for viewing the device from the front, there is a problem that information cannot be viewed from the licking or side surfaces. It was

There is a solution proposed in Japanese Laid-Open Patent Publication (Kokai) No. 2-61693 in which a rotating drum is used, but the light emitting element array is a single array, and when used, it is too dark and can only be used at night. There is a problem.

In the conventional matrix type, the LED is small as an element, and a very large number of elements are required on a plane for displaying information (eg, an LED with a diameter of 3 mm is used on a small plane of 10 cm × 10 cm). In that case, 1089 LEDs are required.), And the device is expensive, which is also a problem.

Further, in the display of such an arrangement, since the element density is too small as the information amount of the information display device, it is used as an expensive advertising device for outdoor viewing a large screen from a distance. ， It is completely unsuitable for indoor use.

[0008] In addition, in the conventional type, in the case of colorization, red,
It is necessary to arrange blue, green, and three-color LEDs on the same plane, which further reduces the element density and is an expensive blue LED.
However, there is a problem that the device becomes very expensive.

It is an object of the present invention to provide a device such as a display that can visually recognize information from all directions, is inexpensive, can cope with high density and color, and can be used also for indoor use.

[0010]

In order to achieve the above object, a rotary afterimage type display device of the present invention comprises a cylinder having a driving means for rotating and a control means for causing a light emitting element array to emit light in synchronization with rotation. In the rotary afterimage type display device including the above, the light emitting element rows are arranged in parallel with the rotation axis and evenly on the circumference of n rows (n is a positive integer).

For the light emitting element rows, n rows are arranged in parallel at the same position in order to increase the brightness of the display for the reason to be described later. L arranged by shifting the elements by d
/ D element array is required, and in order to increase the brightness, n
It is effective to arrange the doubled number of rows evenly on the circumference.

Further, in the case of colorization, it is sufficient to secure the arrangement of the above condition with three colors of red, blue and green, and in that case, the number of rows evenly arranged on the circumference is three times as many as the above condition. Become.

All of the three colors of red, blue and green may be evenly arranged on the circumference, but the rows of red, blue and green are aggregated and the aggregate is evenly distributed on the circumference. It can also be arranged.

[0014]

The function of displaying characters and images by the afterimage of a moving light emitting element can be achieved by a general TV or an open gazette (Japanese Patent Laid-Open No. 2-6169).
3) and the Japanese Utility Model Publication No. Hei 6-43687, which are well known.

These are used as means for displaying on a plane, but when considered as means for displaying, etc., they are only for the front and cannot be visually licked from the side or the side as described above. It is possible to make the display visible at any position by making the display surface cylindrical and displaying the afterimage on the rotating light emitting element array on the cylinder.

In this case, the simplest method is to arrange the light emitting element arrays evenly on the circumference of the cylinder parallel to the rotation axis as shown in FIG.

FIG. 2 shows a case where the synchronous light emission control means emits light while rotating the light emitting element array.

At that time, considering the surface of brightness which is an important point as a device for display or the like, the radius of the cylinder is r,
Letting the diameter of the element be D, the luminance of the light emitting element at a certain position is several 1 per unit area, where c is the maximum luminance when the light emitting element is stationary.

[0019]

[Equation 1]

As an example, when substituting for r of 100 mm and d of 3 mm, c / 1885 is obtained.

However, when the LED matrix is made to emit light, since it is normally made to emit light at a weight ratio of about 1/20 due to addressing, the luminance per unit area is several 2, and in the case of the example, c / 180, which is the ratio of the luminance per unit area to obtain the same luminance in the above example.
It suffices to emit light in synchronization with the same position while rotating the element array of 0.

[0022]

[Equation 2]

Calculating the total number of elements, in the case of the above example, assuming that the number of elements in the column is 20, in the stationary matrix arrangement, 4180 elements are required, while about 1 /
Only 21 elements, 200 elements, are required, and the number of elements is significantly reduced, resulting in an inexpensive and simple configuration.

Further, a normal light emitting element has a diameter of 3 mm.
However, not all of them emit light (L
Consider the ED.) It has a light emitting part in the center, and that light emitting part is responsible for the overall brightness.

Conversely, when the central portion is used, the brightness is improved and the diameter of the light emitting element can be reduced, so that the display density can be improved.

As an example, in LED, the outer diameter is 3 mm.
But even with 5mm, the diameter of the light emitting part is about 1mm, and L
Depending on the shape of the ED, only the light emitting part may be visible.

In a normal LED matrix, the display density of the matrix depends on the outer diameter of the LED, but in the rotation type, the horizontal direction depends on the light emission interval, and the vertical direction also indicates the length of the light emitting elements in the column direction. Let be L (L is the same as D when the element is circular), and let the diameter of the light emitting portion be d. If light is emitted while synchronizing the number of rows of L / d with rotation, the density can depend on d. it can.

In FIG. 4, as an example, L is 3 mm and d is 1 mm.
The above shows the case.

Calculating the luminance in this case in the above example, since in the LED matrix the area of 3 × 3 mm is illuminated by one light emitting portion, similarly the luminance is c / 180 per unit area, but rotation In the formula, the horizontal direction is several 3 per unit area, and the vertical direction is the same brightness every width d. Therefore, the brightness per unit area is several 3 and d
When c is 1 mm and r is 100 mm, c / 628 is obtained.

[0030]

(Equation 3)

Similarly to the above, the ratio of luminance per unit area is 3.5, but since the number of element rows is an integer, the number of rows n is 3 or 4, and L / d = 3 is multiplied. With the total number of light emitting element rows of 9 or 12, it is possible to obtain a display having the same brightness as a normal LED matrix and a display density of about 9 times.

Since the overall brightness differs depending on the environment in which the device is used, it is not necessary to set the brightness to the same level as that of a normal LED matrix. If the brightness is low, n is small, and if the brightness is high, n is set. Just do more.

Moreover, recently, a high-brightness element has been developed, and the brightness itself of the central light emitting portion is several times higher. Therefore, if such an element is used, n can be lowered.

In order to make the display flicker-free, the rotational speed of the cylinder is the reciprocal of the number obtained by multiplying the time resolution of the human eye of 1/24 seconds by n, that is, 24 / n r. p. The number of rotations may be S or more, but when used as a display, if flicker is required, the number of rotations may be less than that.

In the case of colorization, the above conditions are red,
By arranging the three primary colors of blue and green light, the brightness and display density can be realized without changing.

Further, if the red, blue, and green light emitting element rows are arranged collectively, the wiring of the elements can be simplified by the high density technology.

[0037]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described with reference to the drawings.
In FIG. 1, a light emitting element array 3 is arranged around a cylinder 2 connected to a driving means 1 in parallel with the rotation axis of the cylinder and on the circumference thereof. The synchronous light emission control means 4 is installed inside the cylinder, and the cover 5 is transparent in a necessary portion so that light emission can be seen from the outside.

In the embodiment shown in FIG. 3, (a) is a top view and (b) is a side view of the arrangement of the cylindrical portions when n is 10.

Although the embodiment shown in FIG. 5 is not described in the preceding sentence, the arrangement of the cylindrical portion of the light emitting element array in the case where the light emitting elements are arcuate and L / d is 2 and n is 2 ( a)
The top view (b) is a side view.

In the embodiment shown in FIG. 6, the circumference of the light emitting element row red 9, the light emitting element row blue 10 and the light emitting element row green 11 is the same when the light emitting elements are arcuate and L / d is 2 and n is 1. Regarding the above-mentioned uniform arrangement of the cylindrical portions, (a) is a top view and (b) is a side view.

In the embodiment shown in FIG. 7, the light emitting element row red 9 and the light emitting element row blue 10 and the light emitting element row green 11 are similarly gathered when the light emitting elements are arcuate and L / d is 2 and n is 2. , And the set is evenly arranged in the cylindrical portion on the circumference, and (a) is a top view and (b) is a side view.

[0042]

Since the present invention is constructed as described above, it has the following effects.

In the display device of variable information, it is possible to display the information of the luminance which can be visually recognized from the entire circumference and which can be sufficiently used even in the daytime.

Further, since the visibility and the brightness are the same and the display density can be increased, the display of the density which can increase the amount of information and can be used for indoor use can be expressed by the device of the same size.

Further, in the case of colorization, by arranging the three primary colors of light equally, it is possible to make them without changing the visibility, the brightness, the amount of information, and the size of the device.

By assembling the light-emitting element arrays of three colors, the wiring of the elements can be densified and the manufacturing can be simplified.

Moreover, these display devices can be manufactured with a very small number of elements as compared with the matrix system.

[Brief description of drawings]

FIG. 1 is an external view of a rotary afterimage display device.

FIG. 2 is an example of afterimage display.

FIG. 3 is a top view and a side view showing an embodiment of a light emitting element array on a cylinder.

FIG. 4 is an example of an afterimage display of a central light emitting portion.

5A and 5B are a top view and a side view showing an example of a light emitting element array on a cylinder.

6A and 6B are a top view and a side view showing an embodiment of a light emitting element array on a cylinder.

7A and 7B are a top view and a side view showing an example of a light emitting element array on a cylinder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Driving means 2 Cylindrical 3 Light emitting element row 4 Synchronous light emission control means 5 Cover 6 Afterimage by light emission 7 Light emitting element 8 Central light emitting part 9 Light emitting element row Red 10 Light emitting element row Blue 11 Light emitting element row Green

Claims (4)

[Claims] 1. A rotary afterimage display device comprising a cylinder having a driving means for rotating and a control means for causing the light emitting element array to emit light in synchronism with rotation, wherein the light emitting element array is parallel to a rotation axis and circular. A rotating afterimage type display device characterized in that n rows (n is a positive integer) are evenly arranged at the same position on the circumference. 2. When the length of the light emitting elements in the column direction is L and the diameter of the light emitting portion of the light emitting elements is d, the light emitting elements around the cylinder are further arranged in n rows of L / d arranged by shifting by d. 2. The rotary afterimage type display device according to claim 1, wherein double the device rows are evenly arranged on the circumference. 3. The rotary afterimage display device according to claim 1, wherein the light emitting element rows are three colors of red, blue, and green, and the number of rows is tripled and the arrangement is evenly arranged on the circumference. 4. A rotary afterimage display device according to claim 3, wherein the red, blue, and green rows of the light emitting element rows are aggregated and the aggregates are evenly arranged on the circumference.