JP2762018B2 - Large display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large display device for making the brightness of a display panel surface such as a display film uniform.

[0002]

2. Description of the Related Art In general, a large-sized display device of this kind is installed in a station, a subway premises, a shopping street, or the like. A display plate such as a display film is disposed in an opening on the front side of a box-shaped frame. A plurality of long light sources are arranged on the back plate side of the box-shaped frame, and the long light source irradiates the display panel.

Therefore, according to the above configuration, there is a problem that the display plate tends to be bright at a portion near the long light source and dark at a portion far from the long light source, resulting in uneven brightness.

In view of this, it has been practiced to make the brightness of the surface of the display panel uniform. For example, a corrugated reflector is arranged at the bottom of a box-shaped frame, and a fluorescent lamp is arranged at each valley of the reflector, or a triangular reflector is arranged at an intermediate portion between adjacent fluorescent lamps. There were things to arrange.

[0005] However, even with these techniques, unevenness occurs in a portion corresponding to the reflecting portion where the light emitted from the light source hits the display panel, and further improvement has been desired.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a large-sized display device capable of making the brightness of a display panel surface such as a display film uniform.

[0007]

Means for Achieving the Object To achieve the above object, a large-sized display device according to the present invention comprises a display frame body in which a display plate such as a display film is framed in an opening formed on the front side of a box-shaped frame body. In a large display device in which a plurality of long light sources are arranged on the back plate side of the box-shaped frame, and the long light source irradiates the display panel, at least three of the long light sources are arranged in parallel. , With a trapezoidal reflector between adjacent long light sources
And the distance between the display plate is formed on top and parallel flat plate of the reflective portion and the top portion of the reflecting portion and the panel
From the distance between the display plate and the surface of the long light source
The distance between the display panel and the center of the long light source.
The display frame is formed smaller than the separation, and the display frame is arranged to be openable and closable at an opening of the box-shaped frame.

Preferably, a light diffusion portion is formed on the top of the reflection portion, and both sides are formed as mirror surfaces.

In addition, it is desirable to form a strip-shaped light-shielding portion on the surface facing the display panel of the long light source at right angles.

[0010]

According to the first aspect of the present invention, the amount of light emitted from the long light source is large in the near part and becomes small as the distance increases, but the part irradiated in the right angle to the display panel is small. The light is weakly irradiated by the light-shielding portion, and the farther from the long light source, the more the direct light and the reflected light from the long light source concentrate. Light from an adjacent long light source is also irradiated. For this reason, if the reflecting portion has a triangular shape, light concentrates on a portion farthest from the long light source, that is, a portion corresponding to the vertex of the reflecting portion. However, by forming the reflection part in a trapezoidal shape,
The light from the neighboring long light source is extremely
Do not concentrate, and make sure that the top of the
The distance between the display board and the long light source
Greater than the distance between the surface and the display panel and the long light
Since it was formed smaller than the distance from the center of the source, it was long
Light from right beside the light source hits the top of the reflector and reflects
Because the angle is small, the amount of light emitted from the top of the reflector is
weak. In this way, the direct light from the long light source
Because amount of light averaged over the entire display plate is illuminated, the brightness
Ku it is possible to uniform display without uneven. In addition, since at least three long light sources are arranged in parallel, the brightness of the display panel surface can be made uniform over a wide range.

Further , since the display plate is formed in a flat plate shape parallel to the top of the reflecting portion, the display is not distorted, and the entire surface can be viewed even when viewed obliquely. Further, since the display frame is disposed so as to be openable and closable at the opening of the box-shaped frame, maintenance and replacement work of the display plate and the long light source are easy.

According to the second aspect of the present invention, the light emitted from the long light source to the top is diffused by forming the light diffusion section on the top of the reflection section and forming both sides of the light diffusion section as mirror surfaces. Since the concentration of light is further prevented, the amount of light with respect to the display panel is appropriately adjusted, and the uniformity is further improved.

[0013] In addition, according to the third aspect of the present invention, the belt-shaped light-shielding portion is formed on the surface of the long light source which faces at right angles to the long light source, so that the light directly radiated from the long light source to the display panel is formed. It is possible to soften the light amount and uniformize the light amount with other parts.

[0014]

1 to 3 show a large display device according to the present invention.
In this large-sized display device, a display frame 3 framed in an opening 2 formed on the front side of a box-shaped frame 1 is openably and closably disposed, and the back frame 4 side of the box-shaped frame 1 is shown in FIG. Thus, the plurality of long light sources 5 and the reflecting portions 6 are alternately arranged.

The box-shaped frame 1 has an upper frame 1a, a lower frame 1b, and a vertical frame 1c which are framed in a rectangular shape, and a back plate 4 is disposed at an opening 2 on the back side. The back plate 4 is white. It is composed of an iron plate and an aluminum plate. A support member 7 is fixed to the back surface of the box-shaped frame 1 in the vertical direction, and the support member 7 is fixed to a column or a wall 9 via an L-shaped mounting bracket 8.

The display frame 3 comprises a display plate 10 such as a display film on which the contents of an advertisement or the like are displayed and a milky white acrylic resin plate 11 inside and a glass or acrylic resin plate 12 outside.
, And its outer peripheral edge is formed into a rectangular frame by a frame composed of an upper frame 13a, a lower frame 13b, left and right vertical frames 13c, and holding members 13d.
A rotary shaft 14 is provided at the upper end of the vertical frame 13c of the display frame 3, and the rotary shaft 14 rotates with respect to a bearing groove 15 formed on the upper portion of the vertical frame 1c of the box-shaped frame 1. It is provided to be movable and detachable. Thus, the display plate 10 can be rotated around the rotation shaft 14 and can be removed and replaced. A projection 16 projecting outward is formed on the lower frame 1b of the box-shaped frame 1, and a cutout 17 for receiving the projection 16 is formed on the lower frame 13b of the display frame 3. Is formed. The above display frame 3
Is fixed by screwing a screw 18 inserted from below the lower frame 13b to the protruding piece 16.

[0017] Thus, the display stile body 3 by removing the stopper 18, such as a bottom rail screw it is possible to open and close by rotating around a rotation axis 14, Ya replacement and long light source 5 of the display panel 10 Maintenance work of internal parts can be performed.

The long light source 5 is composed of a fluorescent lamp, and a plurality of long light sources 5 are arranged along the surface of the back plate 4 in parallel with each other. As shown in FIG. 5, a strip-shaped light shielding portion 2 is provided on the surface of the long light source 5 facing the display plate 10 at right angles.
0 is formed. The light-shielding portion 20 may be formed by attaching a black tape, a metal sheet, or the like to the surface of the long light source 5. Reference numeral 21 in FIG. 2 is a ballast.

Next, the reflective portion 6 is disposed between the elongated light source 5 adjacent, each reflection part 6 is formed by fixing the trapezoidal cross section of the plate-like body back plate 4. The plate-like body is one in which aluminum or its alloy is surface-finished by chemical polishing, or a plate material such as stainless steel is mirror-finished, and a light diffusing portion 23 whose surface is made of a white iron plate or the like is provided on the top 6a as shown in FIG. It is. Also, the top 6 of the reflecting section 6
a between the display panel 10 and the display panel 10
Greater than the distance b between the surface of the long light source 5 and
Distance c between the display panel 10 and the center of the long light source 5
It is formed smaller than.

[0020] As a result of experiments, the distance between the back plate 4 and the display panel 10, the shape of the reflection portion 6, an optimum dimensioning of up long light source 5 and the back plate 4 or the reflective portion 6 shown in FIG. 5 It was like that.

According to the arrangement, light emitted from the elongated light source 5 is irradiated in all directions as shown in FIG. 6 an elongated light source 5. The irradiation surface of the irradiation light on the display panel 10 can be divided as follows. (a) Site A: Site irradiated from the long light source 5 at right angles to the display panel 10 (b) Site B: Site directly irradiated from the side of the site A (c) Site C: On the white back plate 4 The part irradiated after being reflected (d) The part D: the part irradiated after being reflected on the slope (mirror surface) of the reflecting part 6 (e) The part E: the part is reflected on the slope (white surface) of the reflecting part 6 Area to be irradiated later

[0022] Therefore, it will be described in order below for each of the above site.

[0023] First, light emitted at right angles to the panel 10 from the elongated light source 5 in the region A, is most strongly illuminated among the light direct to the display panel 10. However, since the long light source 5 has the band-shaped light-shielding portion 20 formed on the surface, it does not directly shine on the display panel 10 from the light-shielding portion 20. Light directly radiated from the long light source 5 to the display panel 10 is moderated, and light radiated from the vicinity of the light-shielding portion 20 is radiated, so that the display panel 10 is weakened and radiated.

Next, site B is at a position where direct light can reach, to cover a wide region up to a position close to a long light source 5 next from neighboring sites A. Since the light is radiated obliquely to the display panel 10, the light amount decreases as the distance increases.

The portion C covers a portion closer to the long light source 5 from a position shifted slightly darker than a brighter portion of the portion B to substantially the same position as a portion farther from the portion B.

The portion D covers from a position shifted slightly darker than a brighter portion of the portion C to substantially the same position as a farther portion of the portion C.

The part E covers a narrow range corresponding to the light diffusion part 23.

The next light from the elongated light source 5 also irradiated in the same manner.

As described above, the amount of light emitted from the long light source 5 is large in a near part and becomes small as the distance is long. The direct light and the reflected light from the long light source 5 are concentrated as the light is weakly irradiated and the farther from the long light source 5 is. Light from the adjacent long light source 5 is also irradiated. Therefore, if the reflecting portion 6 has a triangular shape, light concentrates on a portion farthest from the long light source 5, that is, a portion corresponding to the vertex of the reflecting portion 6. However, the reflection part 6 is formed in a trapezoidal shape .
Therefore, the long light source 5 adjacent to the top 6a
Make sure that the light is not concentrated
The distance a between the top 6a of the part 6 and the display board 10 is
The distance b between the display plate 10 and the surface of the long light source 5
And the center of the display plate 10 and the long light source 5
Are formed smaller than the distance c between the long light sources 5.
Light from right besides impinges on the top 6a of the reflector 6 and is reflected
Since the angle is small, the light is emitted from the top part 6a of the reflection part 6.
Light quantity is weak. In this way, the direct light from the long light source 5
At the same time, the entire display panel 10 is irradiated with the average amount of light, so that a bright, uniform display without unevenness is possible.

A light diffusing portion 23 is formed on the top portion 6a of the reflecting portion 6 and its vicinity, and both sides of the reflecting portion at the foot sides are formed as mirror surfaces.
Is diffused and the concentration of light is further prevented, so that the amount of light to the display panel 10 is appropriately adjusted, and the uniformity is further improved.

[Brief description of the drawings]

FIG. 1 is a front view of a large display device according to the present invention.

FIG. 2 is a cross-sectional view taken along line XX of FIG.

FIG. 3 is a sectional view taken along the line YY of FIG. 1;

FIG. 4 is a simplified diagram of a longitudinal section of the large display device.

FIG. 5 is a partially enlarged view of the longitudinal section.

FIG. 6 is an explanatory view of an irradiation state of the display panel of the large-sized display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Box-shaped frame 2 Opening 3 Display frame 5 Light source 6 Reflecting part 6a Top 10 Display board 20 Light shielding part

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Takeshi Takeda 3-2-1, Kamakin, Shizuoka-shi, Shizuoka RIKEN Light Metal Industry Co., Ltd. (72) Inventor Mitsuhiro Sakamoto 3-2-2, Kamakin, Shizuoka-shi, Shizuoka No. 1 Inside RIKEN Light Metal Industry Co., Ltd. (56) References Japanese Utility Model Sho 58-13578 (JP, U)

Claims (3)

(57) [Claims] 1. A display frame in which a display plate such as a display film is framed is disposed in an opening formed on a front side of a box-shaped frame, and a plurality of long light sources are provided on a back plate side of the box-shaped frame. the arranged, in a large display device for illuminating the display panel from the long light source, the elongate light source arranged at least three parallel, placing a reflective portion of the trapezoidal cross-section between the long light source adjacent the display A plate is formed in a flat plate shape parallel to the top of the reflector , and the reflector is
Distance between the top of the display panel and the display panel,
Larger than the distance from the surface of the long light source, the display board
Smaller than the distance between the
And a display frame that is openably and closably disposed at an opening of the box-shaped frame. 2. A light diffusion part is formed on the top of the reflection part,
2. The large display device according to claim 1, wherein both sides are formed as mirror surfaces. 3. A large display device of the length according to claim 1 or 2 wherein the formation of the strip-shaped light-shielding portion on a surface facing at right angles to the panel of scale light source.