JPS6143275Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lighting device for a liquid crystal watch, particularly to a lighting device using self-luminous paint.

The display device of a liquid crystal watch has a liquid crystal cell sandwiched between polarizing plates stacked on top and bottom, and some are equipped with a self-luminous illumination device to make the characters visible even at night. As a type of such lighting device, the present applicant has proposed a device in which a lighting device sealed with a self-luminous paint made of a radioactive substance is disposed below a liquid crystal display device.

This device has the disadvantage that the overall thickness is large because the illumination device is disposed below the liquid crystal display device. Furthermore, in this device, a lid is provided on the top surface of the self-luminous paint, and since the illumination is transmitted through the lid, the light is attenuated and cannot be illuminated brightly.

The purpose of this invention is to reduce the thickness of the lighting device, eliminate the leakage of light emitted from the self-luminous paint, improve reflection efficiency, and further improve the lighting effect, thereby providing a lighting device for an LCD watch using self-luminous paint. That's true. The structure of the present invention is that a reflective member is provided on the lower side of the liquid crystal display device, and promethium is added to the periphery of the reflective member.
147, and the light from the self-luminous paint is reflected by the reflective coating layer of the reflective member and the reflective plate to illuminate the liquid crystal display device above.

This will be explained below with reference to the drawings.

1 and 2, reference numeral 1 denotes a liquid crystal display device, in which polarizing plates 4 and 5 are bonded to the upper and lower sides of liquid crystal cells 2 and 3, respectively. 6 is a lighting device according to the present invention disposed below the liquid crystal display device;
A self-luminous paint 9 made of the radioactive substance promethium 147 is applied around the reflective member 8 made of transparent resin.
is embedded in the reflective member 8, and a phosphorescent agent made of a fluorescent substance is dispersed within the reflective member 8.

A reflecting plate 11 is provided on the lower side of the reflecting member, and the upper surface of the reflecting plate 11 is coated with a white luminous agent or vapor-deposited with silver, aluminum, or the like. Reflector 1
1, the lower part of the display segment 12 of the liquid crystal cell is made rough, and the reflective part 11a has increased diffused reflection.
is formed. A reflective coating layer 13 is formed on the top and side surfaces of the reflective member 8, leaving a display window 7 on the top surface.
is deposited with silver, aluminum, etc.

FIG. 3 shows the device according to the invention described above housed in the watch body, with 14 representing the body 15 and the back cover, 16
is a module in which a display and lighting device is housed, an elastic rod-shaped conductive rubber 18 is placed on a step 17, and a large upper liquid crystal cell 2
is located on the conductive rubber 18. Upper polarizing plate 4
Place the presser metal 19 on the top surface of the module 16.
The conductive rubber 18 is fixed by screws 20 to
It can be compressed and fixed to the liquid crystal cell. A shielding film 23 is placed on the bottom surface of the glass 21, leaving a window 22 so that only the display part of the liquid crystal cell can be seen through.
is provided by printing. Note that the liquid crystal cell may be adhered to the glass 21.

With the above structure, the light emitted from the self-luminous paint 9 is reflected on the reflective coating layer 13 of the reflective member 8 and the reflective plate 11, regardless of whether it is day or night.
The liquid crystal cells 2 and 3 are directly illuminated from below through the window 7, making it possible to clearly see the characters. Moreover, since the luminescent agent is dispersed within the reflective member 8, the luminescent agent is excited by the light from the self-luminous paint and shines, further improving the illumination effect.

FIG. 4 and FIG. 5 show another embodiment of the present invention, in which the same parts as in the previous example are denoted by the same reference numerals, and detailed description thereof will be omitted. In this example, a white luminescent coating layer 10 is applied to the entire upper surface of the reflective member 8. With this configuration, the illumination effect is improved and it is possible to see more clearly. Furthermore, during the daytime, the white phosphorescent coating layer 10 provided on the top surface of the reflective member 8 blocks the interior and is excited by external light to glow, so that the boundary line 24 between the reflective coating layer portion and the window 7 fades, causing both parts to fade. It is possible to make the divisions between the two areas unclear and make the entire surface appear uniform and monochromatic.

As is clear from the above, according to the present invention, the light emitted from the self-luminous paint made of promethium-147 embedded in the reflective member is efficiently prevented from leaking to the outside by the reflective coating layer and reflective plate formed on the reflective member. Since it reflects well and illuminates the liquid crystal display device directly from below, it is possible to clearly see displays such as letters during the day and at night. Furthermore, since the phosphorescent agent is dispersed in the reflective member, the phosphorescent agent is excited by the light from the self-luminous paint, further improving the illumination effect. Furthermore, since the self-luminous paint is disposed on the side of the liquid crystal display device, the overall thickness can be reduced.

[Brief explanation of the drawing]

Figure 1 is a plan view showing one embodiment of the present invention;
The figure is a sectional view, FIG. 3 is a sectional view showing the display illumination device installed in the watch body, FIG. 4 is a sectional view showing another embodiment, and FIG. 5 is a plan view of FIG. 4. be. 1...Liquid crystal display device, 2, 6...Liquid crystal cell,
4, 5...Polarizing plate, 6...Lighting device, 7...Window,
8... Reflective member, 9... Self-luminous paint, 10... White phosphorescent coating layer, 11... Reflective plate, 12... Display segment, 11a... Reflective portion, 13... Reflective coating layer, 14... Body , 15... Back cover, 16... Module, 17... Step part, 18... Conductive rubber, 19
...Pressure metal, 20...Screw, 21...Glass, 2
2...window, 23...membrane.

Claims (1)

[Scope of utility model registration request] In an illumination device for a liquid crystal display device using self-luminous paint, a reflective member made of transparent resin is provided below the liquid crystal display device, a phosphorescent agent made of a fluorescent substance is dispersed in the reflective member, and A self-luminous paint made of the radioactive substance promethium 147 is embedded in the periphery, a reflective plate is provided below it, and silver, aluminum, etc. are coated on the top and side surfaces of the reflective member, leaving the central display area. An illumination device for a liquid crystal watch, characterized in that a vapor-deposited reflective coating layer is formed, and the light from the self-luminous paint is reflected on the reflective plate and the reflective coating layer to illuminate the liquid crystal display device from below.