JPH0647976U - display - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object of the present invention to provide a display device having a wide display directivity angle, a clear display, a three-dimensional effect, an easy-to-see, and continuous number / character display. [Structure] Circuit board 3 on which a plurality of light emitting elements 31 are mounted
And a display case 2 having the circuit board 3 provided therein
Then, in the surface of the display surface portion of the display case 2, there is provided the light guide / display light emitting shaft portion 1 in which the lower portion is in close proximity to the light emitting element 31 and the upper portion protrudes above the display surface portion by a predetermined height. It is characterized by that.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a display device which is installed in a control device or an information guidance device and which displays various variable information.

[0002]

[Prior art]

 FIG. 6 is an explanatory cross-sectional view showing a conventional display device. This display includes a circuit board 43 on which a plurality of light emitting elements 42 are mounted, and a lower opening case body 41 that houses the circuit board 43 therein. The case body 41 is provided with an accommodation vacant chamber portion 45 for separately accommodating each of the light emitting elements 42, and a window hole 44 corresponding to the accommodation vacant chamber portion 45 is opened in the surface of the display surface portion. A transparent film sheet 46 is attached to the surface of the display surface portion to cover the window hole 44. Furthermore, the back surface of the circuit board 43 fitted into the case body 41 is filled with epoxy resin 47 to fix the circuit board 43 to the case body 41. This indicator displays various information by blinking the light emitting element by the signal of the circuit board.

[0003]

[Problems to be solved by the device]

 In the above-mentioned conventional display, the light emitting element is housed in the housing space of the case body, and there is a slight distance from the display surface part (transparent film sheet surface) of the case body. The light emitted from the light emitting element is projected onto the transparent film sheet through the air in the accommodation chamber to illuminate the display surface. Therefore, with this display, the amount of light emission may be attenuated, and the disadvantage that it is difficult to obtain a bright and clear display is not acceptable.Because only the transparent film sheet surface of the display surface part emits light, Display lighting is flat, and the display directivity angle is extremely narrow, which is a drawback. In other words, the display lighting condition can be accurately viewed on the front side of the display surface, but the display lighting condition is extremely difficult to see visually from the lateral direction. Further, since the lighting of the display is flat, there is a disadvantage that the connection of the lighting state between the dots is poor and the continuity of the display of numbers, characters, etc. cannot be obtained.

The present invention solves the above problems and provides a display device which has a wide display directivity angle, has a clear display, has a three-dimensional effect, is easy to see, and can realize continuous number / character display. The purpose is to provide.

[0005]

[Means and Actions for Solving the Problems]

 In order to achieve this purpose, the display device of this invention has the following configuration. The display has a circuit board on which a plurality of light-emitting elements are mounted, a display case in which the circuit board is installed, and a lower part corresponding to the light-emitting element in the display surface of the display case. A light-guiding / displaying light-emitting shaft portion is provided, the upper portion of which projects above the display surface portion by a predetermined height.

In the display device having such a configuration, the light emitting axis portion for light guide / display is provided on the display surface portion of the case body. The light-emitting shaft portion for both light guide and display is a resin-made rod shaft that is transparent and has high light transmittance. This resin rod for display is attached so as to penetrate the display surface. In other words, the lower portion (bottom surface) is provided in close proximity to the upper surface of the light emitting element, and the upper portion is arranged so as to project above the display surface portion. With this structure, the lighting light of each light-emitting element is guided into the rod shaft that is transparent and has high light transmittance, and the side peripheral surface (rising peripheral surface) of the rod shaft protruding upward from the display surface and the upper end surface of the rod shaft. Emits light. Therefore, the amount of light emitted from the light emitting element is projected to the outside with almost no attenuation, and the light is emitted from the upper end surface and the rising peripheral surface of the rod shaft, whereby a wide display directivity angle is obtained and the display looks three-dimensional. Further, continuity is obtained in each light emission of adjacent dots, and numbers or characters can be displayed extremely brightly and clearly.

[0007]

【Example】

 FIG. 2 is a perspective view showing a specific embodiment of the display device according to the present invention.

As shown in FIGS. 1 and 3, the display device includes a circuit board 3, a display case 2 that houses the circuit board 3, and a light guide / display that is provided on a display surface portion 21 of the display case 2. And a light emitting shaft portion 1. The circuit board 3 is a publicly known wiring printed circuit board, and has a wiring pattern on its surface, and a plurality of light emitting elements (light emitting diodes) 31 are mounted on the wiring pattern. In the example, as shown in FIG. 2, an example including 35 light emitting elements (35 dots) 5 (vertical) × 7 (horizontal) is shown. Each light emitting element 31 is electrically connected to the wiring pattern of the substrate 3 by the electrode portion 3a and the wire bonding 3b. Further, as shown in FIGS. 1 and 3, common and individual leads (pins) 3 c are projected from the substrate 1 to the outside of each light emitting element 31.

The display case 2 is made of a resin such as Noryl, PBT, U polymer, etc., and is shaped like a housing with a lower opening, and the top plate portion 24 is set to have a constant thickness. In the surface of the top plate 24 of the display case 2, a number of through holes 22 (35 in the embodiment) corresponding to the light emitting elements 31 are opened. The circuit board 3 is fitted in the display case 2 from the lower side of the opening, and in the fitted state, the light emitting elements 31 are set to correspond to the through holes 22. As shown in FIG. 3, the circuit board 3 is fixed and fixed to the display case 2 by mounting (crimping) pins 23 protruding downward from the bottom surface of the top plate portion 24.

The light guide / display light emitting shaft portion 1 is a round rod-shaped short shaft made of a transparent and highly light transmissive resin, such as an acrylic resin or a polycarbonate resin. The resin-made rod shaft 1 is attached through the through hole 22 of the display case 2 in a penetrating manner. That is, the lower portion (bottom surface) 1a of the rod shaft 1 corresponds to the upper surface of the light emitting element 31, and the upper portion 1b protrudes above the display surface portion (surface of the top plate portion 24 of the display case 2) 21 by a certain height. It can be installed in the condition The display light-emitting shaft portion 1 is attached to the display device case 2 in two steps by pouring resin into the mold, and the display light-emitting shaft portion 1 is integrally and continuously formed on the display device case 2. To be done. It is also possible to add a diffusing agent such as titanium oxide powder to the display light emitting shaft portion 1 in order to obtain a uniform surface luminescence, but the transparent feeling of the display is attenuated by adding the diffusing agent. In the above, the upper end surface of the upper portion 1b and the bottom end surface of the lower portion 1a of the shaft portion 1 are surface-processed into rough surface 13 and 14 having a matte finish for light diffusion, respectively. As a result, the display has a transparent feeling (crystal feeling), high brightness, and sharpness.

FIG. 4 is a perspective view showing another embodiment of the light guide / display light emitting shaft portion 1 protruding from the display surface portion 21 of the display case 2. This embodiment shows an example in which the light-emitting / display light-emitting shaft portion 1 is projected about 3 times higher than the rod shaft 1 of the previous embodiment (the embodiment shown in FIG. 2). By increasing the height of the rod axis 1, the display stereoscopic effect is further doubled, the display directivity angle is further expanded, and the displayed characters and numbers can be seen continuously, enabling accurate representation of natural pictograms. Becomes

FIG. 5 shows another embodiment of the light emitting shaft section 1 for both light guide and display. That is, in the previous embodiment, an example in which the light guide / display light emitting shaft portion 1 has a round bar shape is shown, but in this embodiment, the bar shaft 1 is a segmented bar shaft. Further, in the case of implementation, instead of the round bar shape, a bar axis of various plane shapes such as a plane star shape and a plane flower shape may be used. In this case, a more varied display can be realized.

In the display device having such a configuration, the light guide / display light emitting shaft portion 1 is provided on the display surface portion 21 of the display device case 2. Therefore, the lighting light of each light-emitting element 31 is guided through the transparent and highly light-transmissive rod shaft 1 and projects upward from the display surface portion 21 to the side peripheral surface (rising peripheral surface) 12 and the rod peripheral surface 12. Light is emitted from the shaft upper end surface 11. Therefore, the light emission amount of the light emitting element 31 is projected to the outside with almost no attenuation, and a bright and clear display can be obtained. In addition, the lighting light of the light emitting element 31 is emitted from the upper end surface 11 and the rising peripheral surface 12 of the rod shaft 1, so that a stereoscopic effect can be obtained in the display and a wide display directivity angle can be obtained. Further, continuity is obtained in each light emission of adjacent dots, and a number or character can be displayed extremely brightly and clearly.

[0014]

EFFECTS OF THE INVENTION In the present invention, as described above, the light-emitting axis portion for light guide / display is provided on the display surface portion of the display case, the lower portion of which corresponds to the light emitting element and the upper portion thereof protrudes above the display surface portion. Therefore, the lighting light of the light emitting element is guided into the shaft portion having excellent transparency and projected to the outside. Therefore, a bright and clear display can be obtained with almost no attenuation of the light emission amount. Also, since the lighting light is emitted not only from the tip surface of the shaft but also from the rising peripheral surface, it is not possible to obtain a three-dimensional effect on the display, and the displayed characters and numbers can be seen continuously and natural pictograms can be displayed. It can be expressed clearly. Further, the display can be easily seen not only from the front side of the display surface but also from the lateral direction, and the display directivity angle is widened.

[Brief description of drawings]

FIG. 1 is a side view with a partial cross section showing an embodiment display.

FIG. 2 is a perspective view showing an example display device.

FIG. 3 is a partially enlarged cross-sectional view showing an example display device.

FIG. 4 is a partial perspective view showing another embodiment of a light emitting / displaying light emitting shaft portion that also serves as a light guide.

FIG. 5 is a perspective view showing another embodiment of the display device.

FIG. 6 is a cross-sectional view showing a conventional display device.

[Explanation of symbols]

 1 Light-Emitting Shaft for Display and Display 2 Display Case 3 Circuit Board 21 Display Surface 31 Light-Emitting Element

Claims (1)

[Scope of utility model registration request] 1. A circuit board on which a plurality of light emitting elements are mounted, a display case in which the circuit board is arranged, and a lower part of the display surface of the display case is close to the light emitting element. The display device is characterized in that a light-emitting / display light-emitting shaft portion whose upper portion projects above the display surface portion by a predetermined height is provided.