JPH08705Y2 - Electronic display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a device for selectively blinking light emitting display elements such as LEDs arranged in a matrix to display a display pattern such as characters and graphics.

[Prior art and its problems] Generally, when a light emitting element such as an LED is used for display, visibility tends to be improved by increasing the difference in contrast between when the light is turned on and when the light is turned off. The visibility of light emission of the light emitting element itself is improved by blocking external light such as sunlight or light that is applied to the light. Therefore, conventionally, in this type of electro-luminescent display device, as shown in FIG. 4, a light-shielding plate is provided for each row on the upper side of the arrayed display elements to prevent direct sunlight from shining on the display elements, which causes a reduction in visibility. There is.

Such a structure is effective when the device is installed outdoors, especially during the daytime when the sun is high,
It is intended to prevent direct sunlight from shining on the light emitting surface of the device and to shade the surroundings of the light emitting device to improve the visibility at the time of lighting. In that case, the longer the protruding dimension of the light-shielding plate, the better the obliquely radiated light (such as the morning sun and the western sun) is blocked. However, this causes a problem that the effective viewing angle in the vertical direction is narrowed. For example, if the position of the viewpoint with respect to the installation height of the display board is always the same height as the display board, increase the protrusion of the shading plate and give priority to blocking the irradiation light from diagonally. However, in general, this type of electronic display device is often set at a position higher than the viewing side of the viewing side, and it is necessary to secure an effective viewing angle to the lower side. However, there is a contradictory relationship between "irradiation light blocking" and "securing an effective viewing angle", and both conditions cannot be satisfied at the same time, so both irradiation light blocking and effective viewing angle are considered at the same level. As a result, both conditions could not be satisfied at a sufficient level.

The light shield plate is usually black to prevent light reflection on the plate surface. However, if dust adheres to the surface of the light shield plate due to outdoor use, etc. There is a problem in that the light emitted from the device is reflected by the light shielding plate and is applied to the light emitting surface of the device, resulting in a decrease in visibility.

[Object of the Invention] The present invention has been made in order to solve the above-mentioned problems, and has a wide effective visual angle in the downward direction while blocking the irradiation light from the upper side, and It is an object of the present invention to provide an electronic display device capable of preventing reflection of irradiation light.

[Means for Achieving the Purpose] In the present invention, in order to achieve the above object,
An upper side elastically contacting the lower surface of the light emitting element row and a lower side elastically contacting the upper surface of the light emitting element row are provided to be fixed between the rows of the light emitting elements by the elasticity of the light shielding plate, and the lower side is in a state where the light shielding plate is fixed. The light emitting element has a large width so as to project from the tip of the light emitting element to the display surface side, and an inclined surface is formed on the display surface side from the lower side so as to be continuous with the upper side having a smaller width.

[Embodiment] An embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an external perspective view of an embodiment of the present invention. 1 is an LED (hereinafter referred to as an LED), which is a light emitting element, and is arranged in a matrix on the substrate 2 vertically and horizontally (in the present invention, each character is 16 × 16 × 16)
16 dots), its blinking is controlled by a control device (not shown) composed of a microcomputer, and display patterns such as characters and graphics are displayed as the entire matrix. The LEDs that make up the matrix are arranged in a relatively high density so that misidentification does not occur when letters and numbers are displayed, but in consideration of heat dissipation, the LEDs are 5-10 mm from each other.
They are arranged at intervals. Reference numeral 3 is a light shielding plate which is located between the arranged LEDs in the horizontal direction and blocks the light emitted to the LED light emitting surface. The light-shielding plate may be provided by dividing it in units of one-character display, or may be formed by one member that is continuous over the entire horizontal direction of the display plate. Basically more LEDs
The display plate 4 is composed of 1, the substrate 2 and the light shielding plate 3.

FIG. 2 is an explanatory view showing the side surface of the display plate. As shown in the figure, the light-shielding plate 3 is formed to have a lower side 3-b which is in contact with the upper surface of the LED1 and protrudes by an appropriate dimension outward from the tip position of the LED1, and a lower side which is in contact with the lower surface of the LED1 and smaller than the lower side 3-b. Top side 3-c
And an inclined surface 3-a extending from the outer end of the lower side 3-b to the upper side 3-c. The light shield plate 3 has a thickness slightly smaller than the row spacing of the arranged LEDs, and by being inserted between the rows of the LEDs, the lower side 3-b and the upper side 3-c are elastically fixed to the upper surface and the lower surface of the LED, respectively. It Along with this, inclined surfaces 3-a are formed between the rows of LEDs. The upper side 3-c has a smaller contact size with the LED than the lower side 3-b, and forms a space S below the LED. This space dissipates the heat generated from the LED when emitting light, and functions as a heat dissipation path for the LED by blowing cooling air in the horizontal direction with the light shielding plate.

As shown in FIG. 3, most of the light incident on the inclined surface 3-a from the light source E is reflected at the reflection angle r equal to i (the incidence angle i and the reflection angle r are elastic. The angle with respect to the vertical line N of one piece) is absorbed by the lower surface of the light shielding plate above without reaching the light emitting element 1. The surface of the shading plate is black, and the amount of reflected light is suppressed so that visibility is not adversely affected, but the amount of reflected light will change if dust or the like adheres to the inclined surface 3-a due to outdoor use. To increase. Therefore, the light ray e is incident from obliquely above and the inclined surface 3-
Even if the light is reflected at a, the light is not directly irradiated to the light emitting element 1, and the visibility of the light emitting element is not deteriorated.

As described above, according to the present embodiment, the light shield plate 3 can be fixed only by inserting it between the rows of the LEDs, and the light shield plate can be attached very easily, and the lower side 3-b is in contact with the LED upper surface without any gap. Even with a relatively small protruding size, it is possible to reliably block the irradiation of light from above. In addition, the formation of the inclined surface 3-a does not hinder the visual recognition when looking up from the lower side as shown in FIG. 2, and as shown in FIG. There is no inconvenience that the light is reflected by the light shielding plate and directly radiated to the light emitting element, which deteriorates the visibility.

[Advantages of the Invention] Since the present invention is configured as described above, the following operational effects can be obtained.

It is possible to effectively block the light rays that illuminate the light emitting element from above, and at the same time, it is possible to obtain a wider effective viewing angle in the downward direction.

Even if dust or the like adheres to the surface of the light shielding plate due to long-term use, it is possible to minimize irradiation of the reflected light to the light emitting element by the inclined surface.

Since the light shielding plate is fixed between the rows of the light emitting elements by the elasticity of the light shielding plate itself, a separate means for fixing the light shielding plate is unnecessary,
Easy installation and cost reduction.

[Brief description of drawings]

FIG. 1 is an external perspective view of an embodiment of the present invention. FIG. 2 is an explanatory view showing the side surface of the display plate. FIG. 3 is an explanatory view showing the action of the light shielding plate. FIG. 4 is an explanatory view showing a conventional example. 1 is an LED which is a light emitting element, 3 is a light shielding plate, 3-a is an inclined surface, and 3-b
Is the lower side, 3-a is the upper side, 4 is the display plate, and S is the space below the light emitting element.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadahito Matsumoto 1825 Amamiya, Sarahaku-shi, Nagano MK Seiko Co., Ltd. Product Development Laboratory (72) Eiichi Nishimura 1825, Amamiya, Kohei, Nagano Prefecture MK Seiko Co., Ltd. Ken Kawasaki, Examiner, Development Laboratory

Claims (1)

[Scope of utility model registration request] 1. An electro-optical display device comprising a display plate in which light-emitting elements are arranged in a matrix, and a light-shielding plate provided at intervals of one row of the light-emitting elements to be arranged, wherein the light-shielding plate is provided on a lower surface of the light-emitting element array. It has an upper side that contacts and a lower side that elastically contacts the upper surface of the light emitting element column, and is fixed by the elasticity of the light shielding plate between the rows of the light emitting elements, and the lower side is displayed from the tip of the light emitting element with the light shielding plate fixed. An electronic display device having a large width so as to project toward the surface side, and forming an inclined surface on the display surface side from the lower side so as to be continuous with the upper side having a small width.