Illumination – Revolving
Reexamination Certificate
1999-12-07
2001-09-11
O'Shea, Sandra (Department: 2859)
Illumination
Revolving
C362S260000
Reexamination Certificate
active
06286971
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a back-light unit for a liquid crystal display wherein the back-light for a light-introducing plate is equalized in a display area of the liquid crystal display.
2. Description of the Related Art
Recently, concerning a liquid crystal display, particularly, used for a notebook personal computer, a display area becomes large and a frame becomes narrow, therefore, various techniques are used in order to match a size of a light-introducing plate with that of a luminous part of a lamp.
For example,
FIGS.3 and 4
show a conventional liquid crystal display. In this liquid crystal display, a fluorescent lamp
2
is positioned along a side of a light-introducing plate
1
. In this case, when the fluorescent lamp
2
is stored in a liquid crystal display frame
5
, the upper and lower sides of the display area
4
tend to be dark. Since both sides of the fluorescent lamp
2
are covered with silicon rubber (lamp-holders/electrode-insulators)
3
for holding and insulating the electrode and the lead connector of the thermionic emission part, the both sides become non-luminous parts.
In order to equalize the back-light in the display area (in order to make the whole display part equally bright), as shown in
FIG. 5
, a fluorescent lamp
2
A is made longer, and thereby parts to be covered with the silicon rubber
3
are positioned at the outsides of the light-introducing plate
1
.
However, the parts covered with the silicon rubbers
3
project from the liquid crystal display frame
5
. As a result, it is impossible to make the frame narrow.
In order to make the frame narrow, as shown in
FIG. 6
, both sides of a fluorescent lamp
2
B are bent, the electrodes and the lead connectors of the thermionic emission part, namely, the parts covered with the silicon rubber
3
are positioned along the upper and lower sides of the light-introducing plate
1
(for example, see Japanese Patent Application Laid-Open No. Hei8-160425).
However, it is impossible to make the frame narrow sufficiently.
Also, the structure is proposed wherein a substrate on which inverter lighting parts or the like are mounted by the fluorescent lamp is positioned along the side of the light-introducing plate (for example, see, Japanese Patent Application Laid-Open No. Hei6-313884).
However, in order to match the luminous part of the fluorescent lamp with the display area, it is necessary to use a pole lamp of which both sides are bent, therefore, the liquid crystal display frame must be widened to the lamp side so as to match the necks of the pole lamp of which both ends are bent.
SUMMARY OF THE INVENTION
In view of the above, it is an object of the present invention to provide a back-light unit for a liquid crystal display which can equalize and uniformly spread a back-light for a whole of a display area without changing a size of a frame of a liquid crystal display device.
According to an aspect of the present invention, there is provided a back-light unit for a liquid crystal display for equalizing and uniformly spreading back-light for a whole display area comprising:
a fluorescent lamp for emitting thermoelectrons composed of a pole lamp body, electrodes each being inserted from one face near each of both ends of the pole lamp body and lead connectors facing outside the lamp body and outside the back-light unit to apply electric power to the electrodes;
a light-introducing plate to introduce light emitted from said fluorescent lamp to the display area; and a lamp storing part positioned at a side edge of the light-introducing part having the display area on its surface to house the fluorescent lamp.
In the foregoing, a preferable mode is one that wherein further comprises reflector sheets mounted around the light-introducing plate and a lamp holder.
Also, a preferable mode is one wherein the lamp storing part is a long concave part having light-shielding walls at both ends within which the pole lamp body is positioned.
Also, a preferable mode is one wherein the lamp is a pole-like fluorescent lamp being filled with a small amount of mercury vapor and argon gas.
Also, a preferable mode is one wherein the reflector sheets reflect light emitted from the fluorescent lamp and introduce said light to the light-introducing plate.
Also, a preferable mode is one wherein the silicon rubber is used as insulation-holding means for insulating the electrodes and for holding the lead connectors.
Also, a preferable mode is one wherein the concave part is positioned at the left side of the light-introducing plate.
Also, a preferable mode is one wherein the concave part is positioned at the right side of the light-introducing plate.
Also, a preferable mode is one wherein the concave part is positioned at the upper side of the light-introducing plate.
Furthermore, a preferable mode is one wherein the concave part is positioned at the lower side of said light-introducing plate.
With the above configuration, a lamp of which its ends also emit lights is stored in the lamp storing part provided in the light-introducing part, therefore, it is possible to equalize the light for the display area without changing the liquid crystal display frame.
REFERENCES:
patent: 4811507 (1989-03-01), Blanchet
patent: 4860171 (1989-08-01), Kojima
patent: 4914553 (1990-04-01), Hamada et al.
patent: 5178447 (1993-01-01), Murase et al.
patent: 5982090 (1999-11-01), Kalmanash
patent: 6064455 (2000-05-01), Kim
patent: 52-167872 (1977-06-01), None
patent: 6313884 (1994-11-01), None
patent: 8160425 (1996-06-01), None
patent: 8-234676 (1996-09-01), None
Fernandez Maria
NEC Corporation
O'Shea Sandra
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