JPH07261674A - Display device with grid for light shielding - Google Patents

Abstract

PURPOSE:To improve visibility by arranging a grid for light shielding assembled by horizontally and vertically intersecting light shielding plates on the front surface of a display screen and inclining the respective light shielding plates slightly in a direction where light passes a visual point range when the light shielding plates are virtually extended forward. CONSTITUTION:This display device consists of the display screen 1 and the grid 2 for light shielding arranged on the front surface of this screen. The display screen 1 consists of an LED dot matrix light emitting display arranged and formed vertically and horizontally with many light emitting dots (pixels) 1a contg. LEDs on the front surface. The grid 2 for light shielding is fixed to the front surface of the display screen 1 formed with the many light emitting dots 1a in the dot matrix form. The respective light shielding plates 2a, 2b are perpendicular to the display screen 1 but are slightly inclined. A batter is able to view the ball throwing action projected on the display screen 1 through the respective square meshes of the grid 2 for light shielding. The external light from a front diagonal direction is shielded by the respective light shielding plates 2a, 2b of the grid 2 for light shielding and the images of the display screen 1 have an easily visible contrast.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is installed in a pitcher pitching movement display device installed in a baseball or softball batting practice field (so-called batting center) or a tennis practice field (so-called auto tennis). The present invention relates to a display device for use in an application such as a player operation display device in which a viewpoint (viewing distance and viewing position) with respect to a display screen can be specified in a narrow range.

[0002]

2. Description of the Related Art In a baseball batting practice field, a large number of pitching machines are designed to throw a ball toward a bat at a distance of about 15 to 20 meters located in front of each of them.
The batter practices the batting by standing in this bat and hitting the ball thrown back. However, in actual striking, the batter swings the bat by measuring the pitching motion (motion) of the pitcher and then swinging the bat. Therefore, the pitching machine has a drawback that the pitching timing of the ball is difficult to understand. .

Therefore, in a conventional batting practice field, as shown in FIG. 9, an LED [Light Emitting Di
ode] A display device 12 of a dot matrix system or the like is arranged, and a pitching machine 13 is provided from the side of the display device 12.
There is a thing to throw the ball in. That is, the pitching motion of the pitcher is displayed on the display screen of the display device 12, and the pitcher of this image throws the ball from the pitching machine 13 at the same timing as the pitcher throws the ball.
The batter 11 can perform batting practice with the same feeling as an actual batting.

[0004]

However, since the batting practice range is brightly illuminated so that the ball can be easily seen even in a bright outdoor place or at night or indoors, such a place Batter 1 close to 20m away
In order to display the pitching motion image of the pitcher so that it can be clearly seen in 1, it is necessary to make the display screen of high brightness against the ambient brightness, and the expensive display device 12 must be used. was there. Also, the batter 11
When viewed from the side, the display devices 12 of the other adjacent bats can be seen side by side in front, so the images of the pitching motions projected on these are troublesome, and it is difficult to concentrate only on the image of the display device 12 of the player's bat. There was also.

[0005]

In order to solve the above-mentioned problems, a display device with a light-shielding grid according to the present invention is a display device for an application in which the viewpoint of the display screen is specified within a narrow range. On the front of the display screen, a light-shielding grid constructed by assembling a large number of light-shielding plates vertically and horizontally is arranged, and when each light-shielding plate in the vertical and horizontal directions is virtually extended forward, it is slightly It is characterized by being inclined to.

It is desirable that the height of the display screen be 1 m.
× It consists of a large screen size LED dot matrix light emitting display with a width of 0.4 m or more, and each light-shielding plate of the light-shielding grid has a black non-reflecting surface, and the thickness of each light-shielding plate is vertical. The thickness of the light shielding plate is 1/100 or less than the light shielding plate arrangement interval in the horizontal or horizontal direction, and the front-rear width of each light shielding plate is 1.
It is 5 times or more.

[0007]

[Operation] When a light-shielding grid assembled by vertically and horizontally crossing light-shielding plates is arranged on the front surface of the display screen, the incident of external light from the left, right, upper and lower diagonal directions on the display screen is shielded. Therefore, the display contrast is improved and the visibility is improved,
It is possible to prevent the display from becoming hard to see, and when the plate surface of each light shielding plate is a light non-reflective surface, external light is absorbed by the plate surface of the light shielding plate, so that the visibility is further improved. Therefore,
Even in an environment where the environment is bright, such as outdoors where direct sunlight is received, a low-luminance inexpensive display device can be used to perform display with good visibility, and the display screen has a height of 1 m and a width of 0. When the LED dot matrix light emitting display with a large screen size of 4 m or more is used, the brightness is higher and clearer than other light emitting displays, and the contrast of the display is significantly improved. An image can be displayed with good visibility. Moreover, when such a light-shielding grid is arranged, it becomes difficult to see the light-emitting display screen from a range other than the specific viewpoint (viewing distance and viewing position) on the front side, so that the display is performed individually for the specific viewpoint, that is, the viewer. Will be able to.

By the way, when the display screen is installed vertically on the ground, if the light shielding plates in the lateral direction of the light shielding grid are arranged horizontally, that is, if they are arranged vertically to the display screen, a specific front surface When viewed from the viewpoint, the light-shielding plate at the same height as the viewpoint can only see the plate thickness, but the light-shielding plates above and below the light-shielding plate are slightly obliquely downward or obliquely upward. Also, the more the light shielding plate is moved up and down, the larger the visible area of this plate surface is, and the smaller the visible area of the display screen is. This is also the case when the vertical shading plates are arranged vertically with respect to the display screen. The more the shading plates are separated from the viewpoint to the left and right, the more the area of the plate surface can be seen and the obstruction ratio to the display screen. (Ratio) increases.

However, in the present invention, the vertical and horizontal shading plates are
Since it is slightly inclined in the direction of passing the specific viewpoint range when it is virtually extended forward, a viewer who looks at the display screen from this specific viewpoint range does not substantially see the plate surface of each shading plate. , Only the plate thickness can be seen. Therefore, it is possible to prevent the display on the display screen from being obscured by the plate surfaces of the vertical and horizontal light shielding plates and becoming difficult to see. In particular, when the thickness of each shading plate is set to 1/100 or less of the shading plate arrangement interval, the area blocked by the thickness of each shading plate becomes small, so that the visibility of the display screen is impaired. Such things almost disappear.

Further, if the front-back width (depth) of each light-shielding plate is set to be 1.5 times the light-shielding plate arrangement interval or more, the visibility of the external light from the oblique direction is remarkably improved and the visibility is improved. Even better, even when a plurality of display devices are installed at appropriate intervals, the display screen of the adjacent display device is hard to see.

[0011]

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 8 show an embodiment of the present invention. FIG. 1 is an exploded perspective view of a display device with a light-shielding grid for displaying a pitching action, and FIG. 2 is a light-shielding plate of the light-shielding grid. FIG. 3 is a schematic vertical sectional view of the display device, FIG. 4 is a side view for explaining the inclination of the light blocking plate of the light blocking grid, and FIG. 5 is a partial front view showing one square of the light blocking grid. FIG. 6 is a side view for explaining the influence of the movement of the viewpoint on one shading plate, FIG. 7 is a partial front view for explaining the influence of the movement of the viewpoint for one square of the shading grid, and FIG. It is another side view explaining the influence of movement of a viewpoint about a shading plate.

The present embodiment exemplifies a display device with a light-shielding grid, which is installed in a batting practice field to display the pitching motion by light emission.

As shown in FIG. 1, this device comprises a display screen 1 and a light-shielding grid 2 arranged in front of the display screen 1.

The display screen 1 is an LE in which a large number of light emitting dots (pixels) 1a containing LEDs are formed in a matrix on the front surface.
It is composed of a D dot matrix light emitting display, and by selectively controlling lighting of each light emitting dot 1a, an arbitrary image such as a pitcher's pitching operation can be light-emitted and displayed. In order to display a clear image in a bright outdoor environment using such a display screen 1, it is usual to increase the number of LEDs in each light emitting dot 1a or to use a high brightness LED.
Although it is necessary to increase the light emission luminance of a, a display image having sufficiently good visibility is obtained by the effect of the light-shielding grating 2 even if such a high luminance is not used.

In this embodiment, the LED which is most suitable for this application
Although the display screen 1 according to the dot matrix system is used, the present invention is not limited to this, and a liquid crystal display device (LCD [Liquid Crystal Display]), a plasma display (PDP [Plasma Display Panel]), or a fluorescent display may be used. A light emitting display device such as a display tube can be used.

The light-shielding grid 2 comprises a large number of light-shielding plates 2 in the horizontal direction.
In this example, a and a large number of light shielding plates 2b in the vertical direction are crossed at equal intervals in the vertical and horizontal directions and assembled. That is, for example, as shown in FIG. 2, notches 2c having equal intervals are provided on one side of the plate material to be the light-shielding plates 2a and 2b, and the notches 2c are assembled orthogonally so that the notches 2c mesh with each other. It is a thing. As a result, the material can be easily processed and assembled, and the strength can be obtained by assembling it in a cross beam shape even if the material has an extremely thin plate thickness. The light-shielding plates 2a and 2b are made of a resin plate, a metal plate, or the like, but are preferably made of a metal plate such as a steel plate so that an appropriate strength can be obtained with a thin plate thickness as described later. Further, it is preferable that these light-shielding plates 2a and 2b have light reflection on the plate surfaces as small as possible, and the light-shielding plates 2a and 2b are made to have a light non-reflective surface by applying black matte coating or surface treatment. The ones are the best.

The light shielding grid 2 is attached and fixed to the front surface of the display screen 1 having a large number of light emitting dots 1a arranged in a dot matrix. At this time, each light blocking plate 2 of the light blocking grid 2
Although a and 2b are substantially perpendicular to the display screen 1, they are slightly inclined as described later.

Such a display device with a light-shielding grid is arranged so that the display screen 1 is substantially vertical to the ground, like the display device 12 shown in FIG.
20m (officially 60 feet, or about 18.3
m) The batter 11 standing at the previous turn at bat can see the image of the pitching motion displayed on the display screen 1 through each square of the light shielding grid 2. At this time, the external light from the front oblique direction is shielded by the respective shading plates 2a and 2b of the shading grating 2, so that the image on the display screen 1 has a good contrast and is easy to see. When the surface is a non-light-reflecting surface, the external light is absorbed and the contrast is further improved, so that a clear image with good visibility can be displayed even if an inexpensive one is used. In addition, since the light-shielding plates 2a and 2b are in the way from other than the front of the display screen 1 and the image is almost invisible, it is not affected by the image on the display device of another adjacent bat.

Since an image of the pitcher's pitching motion is displayed on the display screen 1 described above, in order to prevent the batter 11 from feeling uncomfortable, it is practical to use an image of about 70% of the actual size to a life-size image. Above all, therefore, as the screen size,
Height A is 1.0m-2m and width B is 0.4m-
It is preferably about 1 m. The dot spacing of the light emitting dots 1a on the display screen 1 is 4 mm because the distance to the batter, in other words, the distance to the viewpoint is about 15 to 20 m.
An image of sufficient fineness for practical use is obtained when the thickness is about 10 mm. The display screen with such screen size and dot pitch is 16 x 1
The LED dot matrix method is most suitable because the desired panel can be freely configured by vertically and horizontally arranging 6 to 24 × 24 dot LED panels, and the depth of the display screen can be reduced. In this case, a suitable dot configuration within each square of the light-shielding grid 2 is approximately 4 × 4 dots to 24 × 24 dots, and preferably approximately 8 × 8 dots to 16 × 16 dots.

On the other hand, a light shielding plate 2a in the lateral direction of the light shielding grid 2
It is preferable from the viewpoint of strength and cost that the arrangement interval a and the arrangement interval b of the light shielding plate 2b in the vertical direction are set to about 40 mm to 200 mm, respectively. The arrangement intervals a and b of the light shielding plates 2a and 2b do not have to be the same and need not be even.

The front and rear widths (depth) of the light shielding plates 2a and 2b
It is desirable to set W to be 1.5 times or more the arrangement intervals a and b, and specifically, about 60 mm to 500 mm is suitable. Thus, the front-rear width W of the light-shielding plate is determined by the arrangement interval a, b.
If it is 1.5 times or more, the visibility of the outside light will be more significantly improved and the visibility will be further improved, and the viewing angle of the display screen 1 will be narrowed by that much. The image displayed on the display screen is hard to see. The front and rear widths W of the light shielding plates 2a and 2b do not all need to be the same. For example, as shown in FIG. 3, the front and rear widths W1 of the light shielding plate 2a arranged in the middle of the light shielding grid 2 are shielded at both upper and lower ends. The width W2 of the plate 2a may be made smaller, and the respective light shielding plates 2a in the middle may be attached so as to be slightly floated from the display screen 1.

In this way, for example, in an installation place where it is easy to receive direct sunlight from above, the light shielding plates should be arranged at intervals b <a.
Alternatively, the front-rear width W of the light-shielding plate 2a may be set longer than the front-rear width W of the light-shielding plate 2b so as to set more effectively.

The plate thickness t of the shading plates 2a and 2b is preferably as thin as possible so as not to block the image displayed on the display screen 1, and at least 100 minutes of the arrangement intervals a and b of the shading plates 2a and 2b. It is desired that the thickness is 1 or less, and preferably 1/200 or less. That is, specifically, a thickness of about 0.3 mm to 1.0 mm is suitable, and in the embodiment, the iron plate has a thickness t of 0.5 mm.

A light blocking plate 2a in the lateral direction of the light blocking grid 2
In fact, only those placed 1.5 m above the lower end are horizontal, that is, at right angles to the display screen 1, and those placed above this are tilted slightly downward. However, the one arranged below is slightly inclined upward. That is, as shown in FIG. 4, these shading plates 2a specify that the viewpoint P of the batter 11 is 20 m ahead of the display screen 1 and at a height of 1.5 m from the ground, and each shading plate 2a is moved forward. The tilt angle is changed little by little so that the viewpoint P is passed when the virtual extension is made. Therefore, the angle α1 of the uppermost light-shielding plate 2a is about 88.6 ° from the calculation of tan α1 = 20 m / 0.5 m, and it is inclined about 1.4 ° downward with respect to the horizontal. Further, the angle α2 of the lowermost light-shielding plate 2a is about 85.7 ° from the calculation of tan α2 = 20 m / 1.5 m, and is inclined upward by about 4.3 ° with respect to the horizontal.

Similarly, each of the light shielding plates 2b in the vertical direction is also attached so as to be slightly inclined toward the center so as to pass the above-mentioned viewpoint P when the light shielding plate 2b is virtually extended forward.

When the vertical and horizontal light shielding plates 2a and 2b are inclined as described above, when viewed from the viewpoint P of the batter 11,
Only the plate thickness t of each of the light shielding plates 2a and 2b can be seen, and the plate surface cannot be seen at all. Therefore, as shown in FIG. 5, the total area S of one square of the light-shielding grid 2 is represented by S = a × b, and the area SG blocked by the light-shielding plates 2a and 2b is SG = A × t + b × t−t × t = (a + b−t) × t, for example, a = b = 100 mm, t = 0.5 m
If m (t is 1/200 of a and b), the total area S is 10,000 square mm and SG is about 100 square mm (subtraction is omitted), which is about 1/100 of the total area S. Will be blocked by the light blocking plates 2a and 2b. That is,
1% of the display screen is blocked. If the blocked area ratio is in this range, the batter 11 can view the image displayed on the display screen 1 without hindrance from the viewpoint of the batter 11. However, if the plate thickness t of the light blocking plates 2a and 2b exceeds 1/100 of the light blocking plate arrangement intervals a and b, the area SG blocked by this increases, and the batter 11 may feel annoyed. Occurs.

In the above, the calculation was performed assuming that the batter's 11 viewpoint P is at a height of 1.5 m from the ground. However, in reality, there are individual differences and displacements of the bats, and the batter 11's viewpoint P is usually. The range is moved up, down, left and right by about ± 300 mm (30 cm). Therefore, as shown in FIG.
Assuming that 0 has moved to the viewpoint P1 below 300 mm (0.3 m), if the front-back width W of the light shielding plate 2a is 200 mm, the relationship of tan θ = 0.3 m / 20 m = 3 mm / 200 mm holds ( In this case θ = 0.86 °), batter 1
From 1 on, the plate surface of the light shielding plate 2a can be seen up and down by 3 mm. In this case, as shown in FIG. 7, the area SG blocked by the light shielding plate 2a is d (3
mm), SG = (a + b−t) × t + (a−t) × d, so the total area S is 10,000 square mm, and SG is about 400 square mm (subtraction term omitted). ,
The area of about 1/25 of the total area S is blocked by the light blocking plates 2a and 2b. That is, the display screen is hindered by 4%.

Further, as shown in FIG. 8, when the front-rear width w of the light shielding plate 2a is 300 mm, the relationship of tan θ = 0.3 m / 20 m = 4.5 mm / 300 mm is established (also in this case). θ = 0.86 °), and the width from which the batter 11 can see the surface of the light shielding plate 2a is 4.5 vertically.
Spread to mm. In this case, the area S G blocked by the light blocking plate 2a is about 55 since d = 4.5.
The area is 0 square mm, and an area that is one-eighteenth or more of the total area S is blocked by the light shielding plates 2a and 2b, making it difficult to see. That is, the display screen is hindered by 5.5%.

The shift of the viewpoint as described above is the same for each light shielding plate 2b in the vertical direction when the viewpoint moves horizontally.

Therefore, the front-rear width W of the light-shielding plate 2a is set to 1.5 times or more the arrangement intervals a and b of the light-shielding plates as described above so that the light-shielding effect can be obtained practically sufficiently. Within the range of deviation, the rate of obstruction of the display screen should be 10% or less, preferably 5% or less.

As exemplified above, the light is shielded so that the visibility of a specific viewer (viewing distance, position, viewing position shift condition, etc.) relative to the display device installation condition and environment and the display screen is optimized. It is sufficient to set the arrangement intervals a and b of the plates, the front-rear width W, the angle thereof, and the like.

In the above embodiment, the display device with the light-shielding grid for displaying the pitching action installed in the baseball batting practice field has been described. However, the present invention is a softball batting practice field or a tennis practice field. The present invention can be similarly implemented for a display device such as a display device for displaying an image for each person, which is used for a purpose in which the arrangement of the display screen and its viewing distance and viewing position are specified within a narrow range.

[0034]

As is apparent from the above description, according to the display device with the light-shielding grid of the present invention, the pitching motion is displayed in a bright environment such as a batting practice field, so that the brightness is low and the cost is low. Even if such a display screen is used, it becomes possible to perform a display with good visibility only for a specific batter or the like whose visual point is a narrow range, and the display screen is an LED dot matrix with a large screen size. The light-emitting display body is essentially brighter than other light-emitting display bodies and has a clearer display contrast than the other light-emitting display bodies, so that a clearer image can be displayed. Then, the light-shielding plate of the light-shielding grid has a non-light-reflecting surface, the light-shielding plate has a thickness less than or equal to 1/100 of the light-shielding plate arrangement interval, and the front and rear widths of the light-shielding plate are shielded. If the plate arrangement interval is 1.5 times or more, the visibility can be more remarkably improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a display device with a light-shielding grid according to an embodiment of the present invention.

FIG. 2 is a side view of a light blocking plate of a light blocking grid.

FIG. 3 is a schematic vertical sectional view of the display device.

FIG. 4 is a side view for explaining the inclination of the light blocking plate of the light blocking grid.

FIG. 5 is a partial front view showing one square of the light-shielding grid.

FIG. 6 is a side view illustrating the influence of movement of the viewpoint on one light shielding plate.

FIG. 7 is a partial front view for explaining the influence of movement of the viewpoint on one square of the light-shielding grid.

FIG. 8 is another side view for explaining the influence of the movement of the viewpoint on one light shielding plate.

FIG. 9 is an explanatory diagram showing an installation example of a display device in a batting practice field.

[Explanation of symbols]

 1 Display screen 2 Light-shielding grid 2a Light-shielding plate 2b Light-shielding plate a, b Arrangement distance of light-shielding plate w Front-back width of light-shielding plate t Thickness of light-shielding plate

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location H01L 33/00 N

Claims (5)

[Claims] 1. A display device in which a viewpoint to a display screen is specified within a narrow range, and a light-shielding grid assembled by vertically and horizontally crossing a plurality of light-shielding plates is arranged on the front surface of the display screen, and the vertical and horizontal directions are provided. The display device with a light-shielding grid, wherein each of the light-shielding plates is slightly inclined in a direction passing through the viewpoint range when virtually extended forward. 2. The display screen is an LED dot matrix light-emitting display, and the display screen size is a large screen having a height of 1 m and a width of 0.4 m or more.
The display device with a light-shielding grid according to [4]. 3. The display device with a light-shielding grid according to claim 1, wherein the plate surface of each of the light-shielding plates of the light-shielding grid is a non-light-reflecting surface. 4. The light-shielding plate of each of the light-shielding grids has a plate thickness which is not more than 1/100 of a vertical or horizontal light-shielding plate arrangement interval. The display device with a light-shielding grid as described above. 5. The front-back width of each light-shielding plate of the light-shielding grid is set to be 1.5 times or more the vertical or horizontal light-shielding plate arrangement interval, according to any one of claims 1 to 4. The display device with a light-shielding grid as described above.