JPH0112294Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a display device using a liquid crystal display element as a display portion, and particularly relates to a display device in which the display element is uniformly illuminated to ensure that displayed contents are visible in darkness such as at night.

In other words, some of these types of display devices use a liquid crystal display element with very low power consumption as the display part, but because the display element does not emit light by itself, the displayed content cannot be seen in darkness such as at night. It is known that a point light source such as a light bulb is placed near the element so that the displayed content can be known. However, since this is a point light source that illuminates the liquid crystal display element, it can only illuminate a portion of the display element, and the entire display element cannot be illuminated uniformly, making it difficult to see the displayed content. .

This proposal was made in order to eliminate the above-mentioned drawbacks, especially when point light source illumination is provided from the outside of the display casing using a liquid crystal display element in the display part through the lighting window hole. A tape for diffused light transmission is attached to a window hole for daylighting, and more specifically, a window hole is bored on the back surface facing the display element of a display casing using a liquid crystal display element as the display part,
A light-transmitting plate is attached to the window hole, and a diffused light-transmitting tape is attached to the inner surface of the light-transmitting plate, while a point light source is provided on the outside of the display casing to face the window hole. It is characterized by what it did. With this configuration, especially at night, light from a point light source is diffused by the diffuser-transmitting tape in the window hole and enters the display housing, and then uniformly illuminates the entire display element, making it easier to display. The entire contents can be clearly seen, and the incident light from the window holes can be well scattered by simply attaching diffused light transmitting tape to the inside surface of the perforated plate. It is something.

In addition, the housing support part that supports the display housing is made of translucent synthetic resin, and a point light source is provided in the housing support part facing the window hole, so that the housing support is supported by the point light source. Therefore, when the display housing is mounted on a bicycle or the like, visibility is improved due to the light emitted from the housing support, and safety can be improved.

The present invention will be explained below based on embodiments shown in the drawings.

2 is a digital bicycle speedometer detachably attached to the handlebar 3 of the bicycle body 1 via a mounting member 4; 5 is a magnetic sensor attached to the front fork 6 of the bicycle body 1; A rotation pulse of the wheel 7 is obtained in cooperation with a rotation detecting magnet 8 attached to the wheel 7, and this rotation pulse is input to the speedometer 2 via a pulse transmission cord 9. Furthermore, 10 is a bicycle generator.

In the speedometer 2, 11 is a display window 12 on the front.
A front case 14 is provided with a time key switch 13a, a speed key switch 13b, a distance key switch 13c, and a power key switch 13d for commanding time, running speed, mileage, power on/off, and a button type battery 15 for driving the speedometer. Battery storage section 16
A display housing comprising a rear case 17 comprising: 1
8 is a printed circuit board housed within this housing 11;
A transmissive liquid crystal display element 19 is attached to the printed circuit board 18 facing the display window 12, and a lighting hole 20 is provided at a location facing the display element 19. Furthermore, the printed circuit board 18 has a clock function and the magnetic sensor 5. The running speed and running distance are calculated by inputting rotation pulses from the time key switch 1.
3a, the time is displayed on the display element 19 by pressing the speed key switch 13b and the distance key switch 13c.
A microcomputer-type calculation integrated circuit 21 is installed to selectively display either the running speed or the running distance. Furthermore, a window hole 22 is bored in the back surface of the rear case 17 facing the display element 19, and a through-hole plate 23 is fitted into the window hole 22 and attached thereto by gluing. A diffused light transmitting tape 24 made of white vinyl chloride or the like is attached with adhesive or the like, and external light passes through the light transmitting plate 23 of this window hole 22 and is scattered by the diffused light transmitting tape 24 into the housing 11. enters the hole 2 of the printed circuit board 18.
The display element 19 is designed to have a display effect by uniformly hitting the transmissive liquid crystal display element 19 through 0.0.

Furthermore, the mounting member 4 is made of elastic, translucent synthetic resin, and has a cross-sectional shape with a pair of arm pieces 25, 25 facing each other at both ends, which fit into the pair of mounting grooves of the speedometer 2. It consists of a housing support part 26 and a mounting bracket 27 made of metal and fixed so as to intersect with the central part of the housing support part 26 in a T-shape. A lighting section provided at a location facing the light-transmitting window 22 when attached to the mounting member 4;
A resin socket 3 supports a light bulb 29, which is a point light source, in a hole for a socket, which is drilled in a stepped manner at 7.
0 is inserted, and a thin recess 31 for storing a light bulb is formed in the housing support portion 26 facing the lens surface of the light bulb 29. One lead wire 32a of the light bulb 29 is inserted between the opening periphery of the socket 30 and the mounting bracket 27 and grounded to the mounting bracket 27, and the other lead wire 32b is connected through the power supply line 33. Bicycle generator 10
At night, electricity is supplied from the generator 10 to emit light, and this light is scattered by the light-transmitting tape 24 from the transparent plate 23 of the window hole 22 and guided into the housing 11. The light impinges on the transmissive liquid crystal display element 19 uniformly, thereby allowing the liquid crystal display element 19 to display clearly.

As explained above, according to the present invention, the light from the light bulb, which is a point light source, is scattered by the diffused light transmitting tape attached to the light transmitting plate, uniformly illuminating the liquid crystal display element, and display contents can be clearly seen. This makes it possible to completely prevent reading errors, and furthermore, it is possible to easily obtain good scattering of incident light from the window holes simply by attaching a diffused light transmitting tape to the inner surface of the perforated plate.

Further, when the display housing is mounted on a bicycle or the like, visibility from the front and sides is improved due to the light emitted from the housing support portion, and safety can be improved.

[Brief explanation of the drawing]

The drawings all relate to an embodiment of the bicycle speedometer of the present display device. Figure 1 is an overall view of the display device installed on a bicycle, Figure 2 is a view of the device installed on a mounting member, A is a front view, and B is a side cross-section. It is a diagram. 19...Transmissive liquid crystal display element, 11...Display housing, 20...Window hole, 23...Transparent plate, 24...
Diffused light transmission tape, 29...Light bulb.

Claims (1)

[Scope of utility model registration request] A window hole is bored in the back surface facing the display element of a display case using a liquid crystal display element as a display part, and a light-transmitting plate is attached to the window hole, and light is diffused on the inner surface of the perforated plate. A transparent tape is pasted, and a housing support part that supports the display housing is formed of a transparent synthetic resin, and a point light source is provided on the housing support part facing the window hole. A display device.