JPH0263092A - Display device - Google Patents

Abstract

PURPOSE:To eliminate decrease in the brightness of an object of display on a display panel even if there is not a reflecting plate which is required before and to facilitate cleaning by providing a reflecting layer to a part of the external tube of a fluorescent lamp. CONSTITUTION:The display device embosses the display object on the display panel with light from the fluorescent lamp and the reflecting layer 32 is formed as a reflecting mirror film on part of the external tube 31 of the fluorescent lamp 30 by aluminum vapor deposition, etc. The majority of the light emitted by the fluorescent lamp 30 is used as light for the display of a liquid crystal display panel 10, so symbols are displayed on the liquid crystal display panel 10 with high brightness without increasing the number of fluorescent lamps 30 nor using a fluorescent lamp 30 with high brightness characteristics. Further, when stains sticking on the fluorescent lamp 30 are removed, the fluorescent lamp 30 in a detached state is only cleaned and the maintenance is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a display device used as a liquid crystal television, an illuminated signboard, or the like.

In recent years, it has become possible to display color TV images using liquid crystal displays, and in particular, amorphous 5i-
Active matrix type liquid crystal displays using TPT (thin film transistor) arrays are capable of displaying full-color TV images comparable to CRTs, and have the potential to be used in a wide range of fields such as personal TVs, various video equipment, and information terminals. be.

A liquid crystal color display will be taken as an example of a conventional display device and will be explained with reference to FIG. FIG. 8 is a side view of the liquid crystal color display.

A light diffusing plate 2 is provided on the back side of the liquid crystal display panel 10.
0 is provided, and a reflecting plate 80 is fixed with the fluorescent lamp 30 in between. Most of the light emitted from the fluorescent lamp 30 is reflected by the reflective plate 80 to the liquid crystal display panel 1.
0, and the display target on the liquid crystal display panel 10 is displayed with high brightness. Note that if dirt adheres to the reflective Fi 80, the light emitted from the fluorescent lamp 30 toward the reflection plate 80 will be absorbed by the adhered dirt, reducing the brightness on the liquid crystal display panel 10. In order to maintain brightness, it is necessary to clean the reflector 80 regularly.

However, in the case of the above-mentioned conventional example, it is usually necessary to clean the reflector plate 8o after removing peripheral parts including the fluorescent lamp 3o from the device, and this cleaning is very troublesome. There is a drawback. In addition, although an LCD color display without a reflector has an advantage in terms of maintenance, the light from the fluorescent lamp 30 diverges in all directions and is not used effectively. In order to compensate for the decrease in brightness, it is necessary to increase the number of fluorescent lamps 3o or to adopt fluorescent lamps 3o with high brightness characteristics, which has the disadvantage that there is a commensurate increase in cost. In particular, while the LCD color displays used in aircraft multi-purpose displays require extremely high brightness, the multi-purpose displays themselves are compact, which exacerbates these drawbacks. will be done.

The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a display device that does not have a structure that does not include a reflector, but does not cause a decrease in brightness on the display panel. .

The display device according to the present invention is a device that displays a display target on a display panel in a raised manner by transmitting light from a fluorescent lamp, and the display device is a device that displays a display target on a display panel in a raised manner by transmitting light from a fluorescent lamp, the display device comprising: A reflective layer is provided on the surface.

A portion of the light emitted from the light emitting part of the fluorescent lamp last month is reflected by the reflective layer and travels toward the display panel.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a display device according to the present invention will be described below with reference to the drawings. Figure 1 is an exploded perspective view of the liquid crystal color display, Figure 2 is a side view of the liquid crystal color display, and Figure 3 is a side view of the liquid crystal color display.
The figure is a side view of a fluorescent lamp, Figure 4 is a side view of a fluorescent lamp to explain a modification of the reflective layer, and Figure 5 is a side view of a liquid crystal color display to explain a modification of the method of fixing the fluorescent lamp. The main part side view, FIG. 6, and FIG. 7 are diagrams for explaining other embodiments of the liquid crystal color display. FIG. 6 is a diagram corresponding to FIG. 1, and FIG. 7 is a diagram corresponding to the second embodiment. FIG.

The liquid crystal color display listed here is used as a component of the multi-purpose display mounted on an aircraft, and is displayed to pilots through symbols displayed on the liquid crystal display panel 10 (corresponding to the display panel). Information necessary for navigation is transmitted. Each component of the liquid crystal color display will be explained below.

Symbol information to be transmitted to the pilot is generated by a symbol generator in a graphic processor (not shown), and is sequentially output to the drive circuit 40 at predetermined timing.

The drive circuit 40 is a circuit board for generating an image electrical signal based on the information of symbols introduced sequentially, and is configured to sequentially output the image electrical signal to the liquid crystal display panel 10 via a predetermined cable. It has become. Furthermore, between the drive circuit 40 and the liquid crystal display panel 10, a fluorescent lamp 30 and a light diffusion plate 20 are provided as shown in FIG. The 1013 fluorescent lamps 30 and the drive circuit 40 can each be fixed to predetermined portions of the housing (not shown).

The three fluorescent lamps 30 (equivalent to fluorescent lamps) and the light diffusion plate 20 constitute a backlight system for the liquid crystal color display, which irradiates the back side of the liquid crystal display panel 10 with homogeneous white light. It looks like this. Moreover, a reflective layer 32 is provided on a part of the outer bulb 31 of the fluorescent lamp 30, as shown in FIGS. 2 and 3.

The reflective layer 32 is a reflective mirror film formed by aluminum vapor deposition on the drive circuit side of the outer bulb 31 of the fluorescent lamp 30, and is a fluorescent paint film formed on the inner surface of the fluorescent lamp 30 as shown in FIG. 33
Among the light that is emitted and travels in all directions, the light that travels toward the drive circuit is reflected by the reflective layer 32 toward the light diffusing plate. Further, the reflective layer 32 may be formed on the inner surface of the fluorescent lamp 30 as shown in FIG.

In the liquid crystal color display configured as described above, most of the light emitted from the fluorescent lamps 30 becomes light for displaying the liquid crystal display panel IO, so the number of fluorescent lamps 30 may be increased or High brightness fluorescent lamp 30
Even if the LCD panel 10 is not adopted, the symbols on the liquid crystal display panel 10 can still be displayed with high brightness.

In addition, when cleaning dirt attached to the fluorescent lamp 30,
It is only necessary to clean the fluorescent lamp 30 after it has been removed, and the fact that the internal configuration is much simpler than that of a conventional liquid crystal color display equipped with a reflector 80 makes maintenance of the multi-purpose display easier. It can be simplified.

Next, a modification of the fluorescent lamp fixing method will be described with reference to FIG. 5. However, the drive circuit is not shown.

That is, the space between the reflective layer 32 of the fluorescent lamp 30 and the bottom plate 60 on the housing side is filled with a thermally conductive compound 70.
This fixes the three fluorescent lamps 30.

In the case of this modification, the heat emitted from the fluorescent lamp 30 can be efficiently radiated through the thermally conductive compound 70 and the bottom plate 60. Conventional liquid crystal color displays cannot adopt this type of display.

Next, another embodiment of the liquid crystal color display will be described with reference to FIGS. 6 and 7.

A light guide plate 50 made of glass or the like is arranged in a triangular shape between the liquid crystal display panel 10 and the drive circuit 40. - fluorescent lamps 30 are arranged on the sides of the light guide plate 50. It is set up. A portion a in the figure of the light guide plate 50 is formed in an R shape, and an aluminum reflective film or the like is formed on the surface indicated by the circle in the figure. That is, most of the light emitted from the fluorescent lamp 30 is collected on the section a of the light guide plate 50 and then reflected on the section b, and becomes light for displaying symbols on the liquid crystal display panel 10.

Therefore, in the case of the other embodiments described above, symbols with uniform brightness are displayed on the liquid crystal display panel 10 even if there are - number of fluorescent lamps 30, and the structure is relatively simple. A thin liquid crystal color display will be realized.

It should be noted that the display device according to the present invention can be applied not only to liquid crystal color displays but also to illuminated signboards and the like, and the type and structure of the fluorescent lamps are not limited.

As stated above, in the case of the display device according to the present invention, a reflective layer is provided on a part of the outer bulb of the fluorescent lamp, so there is no need for a reflective plate, which was conventionally required, and a large size is required. Even without increasing the number of fluorescent lamps, which would increase costs, the brightness of the displayed object on the display panel will not decrease. Moreover, dirt attached to the fluorescent lamp can be cleaned with the fluorescent lamp removed, so cleaning is easy.

[Brief explanation of the drawing]

1 to 5 are diagrams for explaining one embodiment of a display device according to the present invention, in which FIG. 1 is an exploded perspective view of a liquid crystal color display, and FIG. 2 is an exploded perspective view of a liquid crystal color display. FIG. 3 is a side view of a fluorescent lamp, FIG. 4 is a side view of a fluorescent lamp for explaining a modification of the reflective layer, and FIG. 5 is a side view of a fluorescent lamp.
The figure is a side view of a main part of a liquid crystal color display for explaining a modified example of a method of fixing a fluorescent lamp, and FIGS. 6 and 7 are diagrams for explaining other embodiments of a liquid crystal color display. FIG. 6 is a diagram corresponding to FIG. 1, FIG. 7 is a diagram corresponding to FIG. 2, and FIG. FIG. 3 is a side view of the display. 10...Liquid crystal display panel 30...Fluorescent lamp 31...Outer tube 32...Reflection layer

Claims (1)

[Claims] (1) A display device that displays a display object on a display panel in a raised manner by transmitting light from a fluorescent lamp, characterized in that a reflective layer is provided on the opposite side of the display panel of the outer tube of the fluorescent lamp. An indicator for