JPH01170982A - Electrooptic display device - Google Patents

Abstract

PURPOSE:To improve the view effect over a wide angle range by providing a light emission surface for slanting forward emission and making its center part higher than the peripheral part. CONSTITUTION:A package 1 has a slanting surface on the front side so that the slanting forward diffusion of light increases, and the front of the package 1 is flat. Consequently, the angle of incidence of light which is emitted laterally by a light source and strikes on the internal wall of the package 1 becomes large to increase the transmissivity of lateral light and also direct the reflected light not to the front, but the opposite sideward side, so the quantity of lateral emitted light is increased relatively. Consequently, the visibility is improved over the wide angle range.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a matrix display device that displays letters and characters arranged in a matrix, and more particularly to an electronic display device that constitutes a dot display unit. [Prior art] Neon signs have been used for a long time to display specified content using shapes and colors, but recently, light-emitting diodes, discharge lamps, etc. have been used to display specific content. 2. Description of the Related Art Display devices that are configured in dot display units (display pixel units) and selectively turn on and off the dot display units are becoming popular. Since the displayed content can be changed by turning on/off each dot, neon signs do not have a specific shape or color like neon signs, but can display letters, patterns, and other characters freely. has no great advantages. Therefore, dynamic display can be performed freely and can be effectively used for advertisements, electronic news, message display, guidance, etc. (Problems to be Solved by the Invention) Incidentally, light emitting diodes and discharge lamps used as electronic indicators are designed so that their directivity characteristics are high brightness toward the front. As a result, the visibility of the displayed content from the side is poor, and the display range is also narrow (which reduces the display value).In addition, neon signs are more likely to turn on at night than before.
Matrix display devices were used exclusively for advertising purposes, such as displaying specific content, but matrix display devices can freely display letters, patterns, and other characters, and can also be used to display electronic news, messages, guidance, etc. , and are increasingly being used not only at night but also during the day. However, as usage patterns during the day become more diverse, the brightness of sunlight causes the display to become weak in contrast (and lateral visibility becomes even worse). The object of the present invention is to solve the above-mentioned problems and to provide an electric light display with high visual recognition effect over a wide angle. The display device is an electric display device used in a display device that is arranged in a matrix and selectively turns on/off, and is characterized by having a light emitting surface diagonally forward. [Function] Since the electric light display of the present invention has a light emitting surface diagonally forward, visibility from the diagonal direction is high.Therefore, the electric light display of the present invention is arranged in a matrix to selectively turn on/off the light. Even when used in a display device, it is possible to improve visibility from a distance and at a wide angle. [Examples] Examples will be described below with reference to the drawings. Fig. 1 shows an electronic display according to the present invention. A diagram showing one embodiment of the device,
FIG. 2 is a diagram showing another embodiment of the electronic display device according to the present invention which is made into a unit. In FIG. A display element is shown. In Fig. 1, the pan cage (case) 1 is oriented in the lateral direction (
Slanted surfaces are formed on the sides of the front surface to increase the diffusion of light diagonally forward. . For example, a plastic case is generally used as the package l. A conventional display element package has a cylindrical shape with a spherical tip, for example, as shown in the display element 4 in FIG. This is to obtain high brightness in the front direction. That is, in the case of illumination, lighting effects are required at a wide angle, but display elements are usually required to have visibility from the front. The shape is such that the light is emitted in the front direction due to reflection, etc. In this regard, in the display element according to the present invention shown in FIG. 1, the front of the package 1 is not completely spherical but has a slightly flattened shape. By doing this, the incident angle of the light emitted from the light source in the lateral direction and hitting the inner wall of the package 1 is increased, increasing the transmissivity of the light in the lateral direction, and the reflected light is also directed not forward but to the opposite side. Since the light can be directed toward the direction of the light, the amount of light emitted in the lateral direction can be relatively increased. The example shown in Fig. 2 shows an example of improvement by arranging unitized display elements. For example, when arranging a plurality of display elements using resin molding, the central display element may be moved forward. , the surrounding display elements are positioned backward, that is, in a spherical arrangement. In this way, the amount of light emitted in the lateral direction can be increased compared to arranging a plurality of display elements on the same plane. Of course, the display elements shown in FIG. 1 may be used as individual display elements in this embodiment. FIG. 3 is a diagram showing an example of a matrix display device using an electric light display according to the present invention, and FIG. 4 is a diagram showing an example of a display unit frame and a louver that constitute a dot display unit using the electric light display shown in FIG. 5 is a diagram showing an example of a display device configured by arranging display units. In FIG. 0, 11 is a matrix display device, 12, 13 and 22 are louvers, and
．． 32 and 33 are display elements, 21 is a base, 23 is a display element mounting hole, 24 is a base mounting hole, 31 is a display unit, and 34 is a display unit mounting surface. In FIG. 3, a matrix display device 1-1 has a plurality of display elements 14 arranged in a matrix, and each display element 14 constitutes a one-dot display unit. Therefore, by controlling the display so that the display elements 14 form a group of, for example, 12x12 or 24x24, one group can display 12x12 dots or 24x24 dots.
It is also possible to display characters in X24 format, and to display pictures, patterns, images, and animations using all display elements 14. As the display element 14, a light emitting diode (LED), a discharge lamp, or the like is used. Looper 12.13 has the same figure price)
As shown in the side view, the looper 13 is provided above the display elements 14 that are arranged in the horizontal direction to block sunlight. When the display is glossy, sunlight is reflected off the top surface and hits the display element, reducing the contrast between when the light is on and when the light is off. However, by glossing only the lower surface, the reflection of sunlight from the upper surface of the looper 13 to the display element 14 above is reduced, and the light when the display element 14 is turned on is reflected downward. If the installation location is high, the display effect can be enhanced. In the above example, a one-dot display unit is composed of one display element, but FIG. 4 shows an example of a display unit frame in which a one-dot display unit is composed of a plurality of display elements. The example shown in Fig. 4 is a display unit frame that uses 4 x 4 display elements to constitute one dot display unit, and in particular, the looper 22 is tilted downward as shown in the figure. is a feature. Generally, large displays are installed outdoors at a high location, and the display surface is almost never below eye level. On the other hand, if the pitch between display elements is shortened as much as possible and the display elements are arranged closely, detailed display becomes possible and the image quality and content of the display can be enhanced. If the pitch between the display elements is shortened, the mounting space for the looper 22 will be limited.If the pitch between the display elements is reduced to the amount necessary for mounting the looper 22, the display element and the looper 22 will be too close to each other, and the pitch between the display elements will be reduced. A problem arises in that the light is blocked by the looper 22 below it and the downward viewing angle becomes narrow. However, if the looper 22 is tilted downward as shown in the figure, the relationship between the display element and the lower looper 22 reduces the amount of light that is blocked by the lower looper 22, and Display effects can be improved. Note that this can be similarly applied even when the pitch between the display elements is long, and in such a case, the looper 22 may be arranged below the center of the pitch between the display elements. As a method of widening the viewing angle, the display unit 31 may be tilted downward with respect to the display unit mounting surface 34, as shown in FIG. By the way, when a light emitting diode is used as a display element, a red element is generally used, but there is a problem that red is harsh on the eyes. To improve this problem, for example, in FIG. 5, an orange display color can be created by using a yellow or yellow-green element as the display element 32 and using a red element as the display element 33. In this case, red is highly visible even in sunlight, but
Colors other than red have poor visibility in sunlight, so if elements of different colors are arranged alternately or in a staggered manner as shown, the display color will be close to red in sunlight, increasing visibility. be able to. FIG. 6 is a diagram showing an example of the mounting height of a display element that improves visibility in the lateral direction, and FIG. 7 is a diagram showing an example of mounting the display element in a display unit. In the figure, 41 is a base, 42 is a looper, 43 is a display element, 44 is a light emitting surface, 45 is a lead terminal, 46 is an enclosure, 47
is a substrate, 48 is a resin, 49 is a display element mounting hole, 50
indicates the display unit mounting hole. Further, FIG. 6 shows an example in which the amount of radiated light in the lateral direction is ensured by adjusting the mounting height when the display element is mounted on the base. In the example shown in FIG.
When the light emitting surface 44 of the 0 display element 43, which places the light emitting surface 44 of the display element 43 at a higher position than the surface of the mounting base 41, is deeper than the surface of the mounting base 41, the lateral part of the light emitted from the light emitting surface 44 A portion of the light in this direction is blocked by the wall surface of the mounting hole of the base 41. Therefore, the amount of radiated light in the lateral direction is cut accordingly, but if the light emitting surface 44 is positioned higher than the surface of the base 41 as shown in the figure, the light radiated in the lateral direction from the display element 43 is still emitted as is. It turns out. When the display unit as described above is used outdoors, it can be molded with a silicone resin, fluororesin, or other resin 48 as shown in FIG. 7 to provide a waterproof structure. FIG. 7 (al) is a cross-sectional view of the display element 43 attached to the base 41 explained in FIG. 2, with the back side molded; , the gap between the substrate 47 and the back surface of the base 41 and the top surface of the substrate 47 are molded.The back view of the base 41 is shown in the figure, and the base 41 is provided with enclosures 46 on three sides. This makes it easier to mold. Note that the present invention is not limited to the above-mentioned embodiment, and various modifications are possible. For example, in the above-mentioned embodiment, the shape of the package was devised to improve lateral visibility. However, depending on the processed shape of the inner surface of the package, the transmittance of light in the lateral direction may be increased, or the degree of reflection in the oblique direction may be increased rather than in the front direction. [Effects of the Invention] As is clear from the above description, according to the present invention, the amount of light emitted diagonally forward from the front light emitting surface is increased, so visibility can be improved at a wide angle. Therefore,
Even if the display device is installed at a high place, by providing a louver above to block sunlight and combining the display device with this louver, it is possible to provide a display device with high visibility even during the day.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of an electronic display device according to the present invention,
FIG. 2 is a diagram showing another embodiment of a unitized electronic display device according to the present invention, FIG. 3 is a diagram showing an example of a matrix display device using the electronic display device according to the present invention, and FIG. FIG. 1 is a diagram showing an example of a display unit frame and a louver that constitute a dot display unit using the electronic display; FIG. 5 is a diagram showing an example of a display device configured by arranging display units;
The figure shows an example of the mounting height of a display element that improves visibility in the lateral direction, and FIG. 7 is a diagram showing an example of mounting the display element in a display unit. 1...Package (case), 2...Display element body, 3 and 5...Lead terminals, 4...Display element.

Claims (4)

[Claims] (1) An electric light display used in a display device arranged in a matrix and selectively turned on/off, characterized by having a light emitting surface diagonally forward. (2) The electronic display device according to claim 1, characterized in that an inclined surface is formed on the front side of the package that covers the light emitting portion as a light emitting surface diagonally forward. (3) The display pixel unit is constituted by an array of a plurality of display elements, and the display elements are mounted in a central part higher than the surrounding part as a diagonally forward light emitting surface. The electronic display device according to item 1. (4) The electronic display device according to claim 3, characterized in that display elements of different colors are arranged in a mixed manner.