JPH06186917A - Light emitting diode display device - Google Patents

Abstract

PURPOSE:To enable packaging by an automatic machine and dealing with high- density packaging by providing a cylinder having an inside surface for reflection of light atop a chip type LED and providing a sheet which is liable to allow transmission of visible light on this cylinder. CONSTITUTION:The red chip type LED 11 is the cylinder 12 having the inside surface liable to reflect light and is molded integrally with a case. The upper surface thereof is covered with the sheet 13 liable to allow transmission of visible light. A signal is transmitted to an LED lighting circuit 16 and lights the chip type LED 11 red when a switch 15 is pushed. The light emitted from the chip type LED 11 reflects irrergularly on the inside surface of the cylinder 12 and makes the inside surface of the cylinder 12 glow red over the entire part. The upper surface part of the hole of the cylinder 12 on the sheet 13 is made to glow pink by the direct light from the chip type LED 11 and the indirect light irregularly reflected on the inside surface of the cylinder 12. As a result, excellent visibility is obtd. even from a diagonal direction. Further, the display device is constituted of only the surface packaging parts, a soldering stage is completed by the reflow soldering alone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display unit for displaying the operating state of industrial and home electric appliances.

[0002]

2. Description of the Related Art In recent years, light emitting diode (hereinafter abbreviated as LED) display devices have been widely used in various electric appliances for industrial use and home appliances.

A conventional LED display device will be described below. FIG. 3 shows a cross section of a conventional LED display device. In FIG. 3, 1 is an LED with leads and 2 is a spacer that defines the height of the LED. Reference numeral 3 is a printed wiring board, and 4 is a switch. Reference numeral 5 is a circuit for lighting the LED, which is connected to the LED 1 and the switch 4. Reference numeral 6 is a case, and a hole 7 is provided in the upper part of the LED.

The operation of the LED display device constructed as above will be described below. First, when the switch 4 is pressed, a signal is transmitted to the circuit 5, the LED 1 is turned on, and light is emitted to the outside of the hole 7.

[0005]

However, the above-mentioned conventional structure has a problem that it is difficult to mount the LED by an automatic machine and the productivity is poor because a spacer is required to make the height of the LED uniform. Was there. Further, there is a problem in that even an LED lead processed to eliminate a spacer has a large mounting area and cannot be used in a product requiring high-density mounting. Also, LE
When the distance between D and the case is large, there is a problem that visibility from an oblique direction is deteriorated.

An object of the present invention is to solve the above-mentioned conventional problems, and an object thereof is to provide an LED display device which can be mounted by an automatic machine, can be used for high-density mounting, and has good visibility.

[0007]

In order to achieve this object, an LED display device of the present invention comprises a chip-type LED and a tube having an inner surface on which the light is easily reflected, and a sheet which easily transmits visible light. Is provided on the cylinder.

[0008]

With this structure, the light of the chip-type LED is diffusely reflected on the inner surface of the cylinder, and the entire inner surface of the cylinder serves as a light emitting source. The visibility from the direction is very good. Further, since the chip type LED is used, mounting by an automatic machine is possible and high density mounting is also possible.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 11 is a red chip type LE.
D and 12 are cylinders having an inner surface where light is easily reflected, and are formed integrally with the case. Reference numeral 13 is a white sheet that easily transmits visible light. Reference numeral 14 is a printed wiring board, 15 is a switch, 16 is a circuit for lighting an LED, and 17 is a case, which have the same configurations as those of the conventional example.

The operation of the LED display device constructed as above will be described with reference to FIG. First, when the switch 15 is pressed, a signal is transmitted to the LED lighting circuit 16 to turn on the chip type LED 11 in red. Chip type LED1
The light emitted from No. 1 is diffusely reflected on the inner surface of the cylinder 12 to make the entire inner surface of the cylinder 12 glow red. By the direct light 18 from the chip type LED 11 and the indirect light 19 diffusely reflected on the inner surface of the tube 12,
The upper surface portion 20 of the hole of the tube 12 on the sheet 13 emits pink light.

As described above, according to this embodiment, a tube having an inner surface on which the light is easily reflected is formed integrally with the case on the upper surface of the red chip type LED, and a white sheet which easily transmits visible light is formed. When the LED is turned on by being provided on the cylinder, the white sheet on the upper part of the cylinder changes to pink only in the upper part of the cylinder, and excellent visibility can be obtained even in an oblique direction. Further, in the present embodiment, since the LED display device can be constructed only by the surface mount components, the soldering process can be completed only by reflow soldering, and the flow soldering process in the case of using the conventional leaded LED can be performed. Can be reduced.

Although the sheet 13 is white in this embodiment, a part of the upper surface of the cylindrical hole may be transparent.

[0014]

As described above, the present invention is a chip type LED.
And a cylinder having an inner surface on the upper surface of which light is easily reflected, and a sheet that easily transmits visible light is provided on the cylinder,
It can be mounted by automatic machines and can be used for high-density mounting.
Further, it is possible to realize an excellent LED display device having good visibility from an oblique direction.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an LED display device according to an embodiment of the present invention.

FIG. 2 is an operation explanatory diagram of the LED display device in the embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a conventional LED display device.

[Explanation of symbols]

 11 chip type LED 12 tube 13 sheet 14 printed wiring board 15 switch 16 LED lighting circuit

Claims (1)

[Claims] 1. A light emitting diode display device comprising a chip type light emitting diode and a cylinder having an inner surface for reflecting light on the upper surface thereof, and a sheet transmitting visible light on the cylinder.