JPH10161562A - Display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display capable of suppressing reflection on a display screen without degrading in display brightness and a heat radiation effect. SOLUTION: A louvre unit 30 is mounted on a display screen of a display unit where luminescence elements are arranged in a matrix form. Each blade 32 of the louvre unit 30 is arranged along either of line or column direction of the matrix arranged with light emitting diodes and also at a border line part of adjoined light emitting diodes. Thus, the blades 32 do not directly cover luminescence surface of the light emitting diodes, and the display brightness of the display is not degraded even when the louvre unit 30 is attached. Moreover, since the blade plates 32 are composed of a member of an excellent thermal conductivity, they function as heat radiation fins and can effectively radiate the heat of the light emitting diodes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device in which a plurality of light emitting elements are arranged in a matrix in a matrix.

[0002]

2. Description of the Related Art As a conventional display device, for example, there is a display device in which a large number of light emitting diodes (LEDs) are arranged in a vertical and horizontal matrix, and various characters and patterns are displayed by controlling lighting of each light emitting diode. In recent years, a display using such a light-emitting diode has been frequently used as a destination guide display installed inside and outside a train because of its high reliability and its display contents can be controlled flexibly and easily. .

When a display is used in a bright place as a display outside a train, the visibility of display contents may be reduced due to reflection of light coming from the outside. Therefore, it is common practice to stick a light-shielding film or the like in which a film having a fine louver structure is sandwiched by a transparent sheet of polycarbonate or acrylic on the display surface of the display to prevent light reflection.

[0004]

However, in such a conventional technique, light is reflected on the surface of the light-shielding film itself attached to the surface of the display, so that the visibility of the displayed content is sufficiently prevented from lowering. There was a problem that it was not possible.

[0005] Further, since the light-shielding film does not transmit 100% of the light from the light emitting diode, the display brightness is reduced by attaching the light-shielding film. Further, there is a problem that the heat radiation effect from the display surface is reduced by attaching the light shielding film.

The present invention has been made in view of such problems of the prior art, and provides a display device capable of suppressing reflection on a display surface without lowering display brightness or heat radiation effect. It is intended to be.

[0007]

The gist of the present invention to achieve the above object lies in the following inventions. [1] In a display device (10) having a display unit (20) in which a plurality of light emitting elements are arranged in a vertical and horizontal matrix,
A louver member (30) for blocking obliquely incident light is attached to the display surface of the display unit (20), and the louver member (30) has a plurality of light-shielding members that stand on the display surface of the display unit (20). A plurality of blades (32), wherein the plurality of blades (32) are parallel to each other, and are arranged along at least one of a column direction and a row direction of a matrix in which the light-emitting elements are arranged; An indicator (10), which is arranged in a line portion.

[2] A display (1) having a display unit (20) in which a plurality of light emitting elements are arranged in a matrix of length and width.
In (0), a louver member (30) for blocking obliquely incident light is attached to the display surface of the display unit (20), and the louver member (30) is attached to the display surface of the display unit (20). The flat plate (31) includes a flat plate (31) that is attached in close contact, and a plurality of light-shielding blades (32) erected on the surface of the flat plate (31). Holes (33) for transmitting light from the light emitting elements are respectively formed at positions corresponding to the respective light emitting elements of the display unit (20), and holes (33) formed in the flat plate portion (31) are formed. The diameter is substantially equal to the outer diameter of the light emitting surface of the light emitting element, and the plurality of blades (3
2) the display units (20) being parallel to each other;
A display device (10), which is arranged along at least one of the column direction and the row direction of a matrix in which the light emitting elements are arranged, and at the boundary between adjacent light emitting elements.

[3] The display (10) according to [1] or [2], wherein the louver member (30) is constituted by a member having a thermal conductivity capable of obtaining a heat radiation effect.

[4] The indicator (1) according to [1], [2], or [3], wherein a blade plate (32) of the louver member (30) is provided at each of the boundary lines.
0).

The present invention operates as follows. Since the louver member (30) attached to the display surface has a light shielding property and includes a plurality of blades (32) that stand on the display surface, oblique light is blocked by these blades, and the light is obstructed by the display surface. Do not reach.

Each of the blades (32) is arranged at a boundary between adjacent light-emitting elements in at least one of the column direction and the row direction of a matrix in which the light-emitting elements are arranged parallel to each other. Since the louver member (30) does not block the light emitted from the light emitting element, the display luminance does not decrease.

A plurality of blades (3) are provided on the flat plate portion (31).
Since 2) is erected, each blade (32) can be easily held upright on the display surface of the display unit (20). Further, light emitted from each light emitting element of the display unit (20) is transmitted to the flat plate portion (3) of the louver member (30).
Since the light passes through the hole formed in 1), the display brightness does not decrease even if the blade plate (32) is held by the flat plate portion (31).

Further, since the louver member (30) is constituted by a member having a thermal conductivity capable of obtaining a heat radiation effect, the louver member (30) functions as a heat radiation fin and effectively removes heat from the light emitting element. You can escape.

Further, since the louver plate (32) of the louver member (30) is provided for each boundary line, the height of the louver plate (32) required for blocking oblique light can be reduced. it can.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a display according to an embodiment of the present invention, and FIG. 2 is a side view.
The display 10 includes an LED unit 20 in which a large number of light emitting diodes are arranged in a matrix, and a louver unit 30 attached to a display surface of the LED unit 20.

In the LED unit 20, fifteen light-emitting diodes (not shown) are arranged in a matrix in a row and column direction with a center-to-center distance of 4 mm. The light-emitting diodes have a light-emitting surface having an outer shape of about 4 mm, and the distance between centers is set to 4 mm so that the light-emitting diodes are arranged close to each other.

The LED unit 20 has a built-in light emitting diode driving circuit. Each light emitting diode is dynamically lit by the driving circuit at a duty of 1/16 and a maximum driving frequency of 8 MHz.

The louver unit 30 includes a flat plate portion 31 having substantially the same size as the display surface of the LED unit 20, and a plurality of parallel blade plates 32 erected on the flat plate portion 31.

When the louver unit 30 is attached to the LED unit 20, the LED unit 2
Light-passing holes 33 are provided at locations corresponding to the respective 0 light-emitting diodes. The diameter of these holes 33 is substantially equal to the outer diameter of the light emitting surface of the light emitting diode. Therefore, when the louver unit 30 is attached to the display surface of the LED unit 20, the LED
The entire light emitting surface of the light emitting diode of the unit 20 can be seen.

Each of the blades 32 is provided in the row direction of the matrix in which the light emitting diodes of the LED units 20 are arranged, at the boundary between adjacent rows and at the upper end of the flat plate portion 31. Therefore, each blade plate 32 does not cover the light emitting surface of the light emitting diode.

The blade plate 32 has a height of several millimeters vertically from the display surface of the LED unit 20, is black, and has a height of 3 mm.
2 Matte so that no reflection occurs on the surface of itself. The louver unit 30 is made of aluminum having good heat conductivity. The louver unit 30 is created by forming an outer shape by extrusion molding or drawing molding, and then opening a hole 33.

In the louver unit 30 shown in FIG. 1, a blade 32 is not provided at the lower edge of the flat plate portion 31. This is because light 41 comes to the display 10 from obliquely above as shown in FIG. Therefore, the blade 32 may be provided at the lower end of the flat plate 31 in accordance with the incident direction of light to be blocked.

Next, the operation will be described. As shown in FIG.
Each blade 32 of the louver unit 30 has a function of blocking light 41 or the like from the outside from reaching the display surface of the LED unit 20 and suppressing reflection on the surface of the LED unit 20. Since the louver unit 30 is matte black, there is almost no reflection by the louver unit 30 itself. Therefore, even if the indicator 10 is installed in a bright place as a display outside the train, the visibility of the indicator is not deteriorated by light from the outside, and a favorable display can be secured. Note that the louver unit 30 is not limited to black and may be dark blue or the like as long as it has no reflection and does not reduce visibility.

Further, each blade 3 of the louver unit 30
2 is disposed at the boundary between the light emitting diodes and the light emitting diode, and the flat plate portion 31 has a hole corresponding to the size of the light emitting surface at a location corresponding to the light emitting diode. 32 and the flat plate portion 31 do not obscure the display surface of the light emitting diode. Therefore, even if the louver unit 30 is attached to the LED unit 20, the display brightness of the display 10 hardly decreases.

Further, since the louver unit 30 is made of aluminum having good heat conductivity, each blade plate 32 functions as a radiation fin, and the heat of the light emitting diode can be efficiently released. Thereby, the LED unit 2
0 can be prevented, and its failure and deterioration can be prevented.

Further, since the blades 32 are provided for each row,
The height of each blade 32 required to prevent light at a predetermined incident angle from reaching the display surface of the LED unit 20 can be reduced.

In the embodiment described above, the blade plate 32
Are provided in the row direction, but may be provided in the column direction according to the direction in which light to be blocked arrives. Further, although the blades 32 are provided for each row in which the light emitting diodes are arranged, they may be provided every several rows.

In the embodiment, the louver unit 30 is made of aluminum. However, a member other than aluminum, such as iron or copper, may be used as long as it has good thermal conductivity.

[0030]

According to the display device of the present invention, since the light arriving obliquely is blocked by the louver member, there is almost no reflection on the surface of the display device, and the visibility can be prevented from lowering. In addition, since the louver members are arranged at the boundaries between the light-emitting elements so that the light-emitting surfaces of the light-emitting elements are not directly covered by the louver members, the display brightness of the display can be reduced even when the louver members are attached. Does not drop.

Further, in the case where a plurality of blade plates are erected on a flat plate portion, holes for light passage are formed in the flat plate portion, so that light from each light emitting element passes through these holes. Even if the blade plate is held by the flat plate portion, the display luminance of the display does not decrease. Further, the blade plate can be easily held in a state of standing on the display surface of the display unit.

Further, in the case where the louver member is constituted by a member having a thermal conductivity capable of obtaining a heat radiation effect, the louver member functions as a heat radiation fin, and heat from the light emitting element can be efficiently released.

Further, in the case where the blades are provided for each of the borders between the columns or rows in which the light emitting elements are arranged, the height of the blades required to block oblique light can be reduced, and the louver can be reduced. The thickness of the member can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing a display according to an embodiment of the present invention.

FIG. 2 is a side view showing the display according to the embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 display 20 LED unit 30 louver unit 31 flat plate 32 blade plate

Claims (4)

[Claims] 1. A display device having a display unit in which a plurality of light-emitting elements are arranged in a matrix of length and width, wherein a louver member for blocking obliquely incident light is attached to a display surface of the display unit, A plurality of blades having a light shielding property standing on the display surface of the unit, wherein the plurality of blades are parallel to each other and at least along one of the column direction and the row direction of the matrix in which the light emitting elements are arranged and A display device, which is arranged at a boundary between adjacent light-emitting elements. 2. A display device having a display unit in which a plurality of light emitting elements are arranged in a matrix of length and breadth, wherein a louver member for blocking light incident obliquely is attached to a display surface of the display unit, A flat plate portion attached to the display surface of the unit with its back surface in close contact with the unit, and a plurality of light-shielding blades erected on the surface of the flat plate portion; Holes for passing light from the light emitting elements are respectively formed at locations corresponding to the respective light emitting elements, and a diameter of the hole formed in the flat plate portion is substantially equal to an outer diameter of a light emitting surface of the light emitting element. The plurality of blades are parallel to each other, and are arranged along at least one of the column direction and the row direction of the matrix in which the light emitting elements of the display unit are arranged, and are located at the boundary between adjacent light emitting elements. Indicator, characterized in that it is arranged in line unit. 3. The display according to claim 1, wherein the louver member is formed of a member having a thermal conductivity capable of obtaining a heat radiation effect. 4. The display device according to claim 1, wherein the louver member has a blade plate provided at each of the boundary lines.