Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Reexamination Certificate
2000-02-04
2003-04-01
O'Shea, Sandra (Department: 2875)
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
C313S503000, C313S504000, C362S084000, C365S111000
Reexamination Certificate
active
06541911
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an electro-luminescence (EL) lamp, and more particularly to a dispersion type EL lamp emitting light in multiple colors.
BACKGROUND OF THE INVENTION
An example of dichroic emission-dispersion type EL lamp is described by reference to
FIG. 5
to
FIG. 7
as a conventional multi-color emission-dispersion type EL lamp.
For the ease of understanding of constitution, the drawings are shown in magnified dimensions in the thickness direction.
FIG. 5
is an outline perspective view of a conventional dichroic emission-dispersion type EL lamp.
FIG. 6
is a sectional view inverted in vertical and lateral direction along line
71
-
72
in FIG.
5
.
FIG. 7
is a sectional view inverted in vertical and lateral direction along line
81
-
82
in FIG.
5
.
In
FIG. 5
, FIG.
6
and
FIG. 7
, the conventional dichroic emission-dispersion type EL lamp comprises a luminous plane
1
of the EL lamp, a plurality of external lead-out electrodes
2
,
3
of light-permeable electrode layers composed inside, and an external lead-out electrode
4
of back electrode layer, and these external lead-out electrodes
2
,
3
and external lead-out electrode
4
are provided at the side of the luminous plane
1
.
In the magnified sectional views of FIG.
6
and
FIG. 7
, the conventional EL lamp comprises a transparent resin film
5
having a luminous plane
1
, a first light-permeable electrode layer
6
printed and formed on other side of the transparent resin film
5
, a first luminous material layer
7
printed and formed on the first light-permeable electrode layer
6
, a second light-permeable electrode layer
8
printed and formed n the first luminous material layer
7
, a luminous color converting layer
9
printed and formed on the second light-permeable electrode layer
8
, a third light-permeable electrode layer
10
printed and formed on the luminous color converting layer
9
, a second luminous material layer
11
printed and formed on the third light-permeable electrode layer
10
, a back electrode
12
printed and formed on the second luminous material layer
11
, and an insulating protective layer
13
for covering all layers.
The external lead-out electrodes
2
,
3
are connected to the first light-permeable electrode layer
6
, second light-permeable electrode layer
8
and third light-permeable electrode layer
10
. The external lead-out electrode
4
is connected to the back electrode layer
12
. The opposite side of the transparent resin film
5
forming the layers is the luminous plane
1
.
The first light-permeable electrode layer
6
contains a transparent resin and a tin indium oxide powder dispersed in this transparent resin. The first luminous material layer
7
contains a highly dielectric resin such as cyano resin or fluororubber resin, and a granular fluorescent material dispersed in this highly dielectric resin. The fluorescent material has copper-doped zinc sulfide or the like. The second light-permeable electrode layer
8
contains a transparent resin and a tin indium oxide powder dispersed in this transparent resin. The luminous color converting layer
9
contains a transparent resin and a fluorescent pigment or fluorescent dye dispersed in this transparent resin. The fluorescent pigment or fluorescent dye has a luminous color of a longer wavelength than the luminous color of the first luminous material layer. The third light-permeable electrode layer
10
contains a transparent resin and a tin indium oxide powder dispersed in this transparent resin. The second luminous material layer
11
contains a highly dielectric resin and a granular fluorescent material dispersed in this highly dielectric resin. The fluorescent material has copper-doped zinc sulfide or the like. The insulating protective layer
12
contains a silver resin system paste or carbon resin system paste.
The thickness of the constituent layers in
FIG. 5
, FIG.
6
and
FIG. 7
are magnified in view, and the actual thickness of each layer is about 1 &mgr;m to about 90 &mgr;m, except for the transparent resin film.
In such dichroic emission-dispersion type EL lamp, the fluorescent material for obtaining a practical emitting luminance and luminance life has cool colors such as blue and green. Therefore, the first luminous material layer
7
has a cool luminous color having a fluorescent material of blue or green luminous color dispersed in a synthetic resin. The second luminous material layer
11
also has cool luminous colors such as blue and green. The luminous color converting layer
9
has warm colors such as orange, red, pink and yellow of longer wavelength than cool luminous colors. The luminous color converting layer
9
has a function of converting the cool luminous color emitted from the second luminous material into a warm luminous color. In such constitution, when light is emitted from the first luminous material layer
7
, the cool luminous color is released from the luminous plane. When the second luminous material layer
11
is illuminated, the luminous color converted into a warm color tone is released from the luminous plane. Thus, different luminous colors are obtained. To illuminate the first luminous material layer
7
, a specified voltage is applied between the external lead-out electrode
2
and external lead-out electrode
3
. To illuminate the second luminous material layer
11
, a specified voltage is applied between the external lead-out electrode
3
and external lead-out electrode
4
.
Each one of the first luminous material layer
7
and second luminous material layer
11
has two-layers in order to enhance the emitting luminance. A first layer of the two layers contains a transparent highly dielectric resin, and a fluorescent powder dispersed in the resin, and a second layer has a highly dielectric resin, and a highly dielectric fine powder such as barium titanate dispersed in the resin.
In such conventional multi-color emission-dispersion type EL lamp, however, when the first luminous material layer
7
is illuminated, the light emitted from the first luminous material layer
7
is reflected by the luminous color converting layer
9
disposed at the back side of the first luminous material layer
7
, and this reflected light is released to the face side. Accordingly, the luminous color released to the face side of the first luminous material layer
7
is interfered by the reflected light. As a result, the original color of the first luminous material layer
7
is hardly released from the luminous plane.
For example, in the constitution in which the first luminous material layer
7
has a fluorescent material of blue luminous color, and the luminous color converting layer
9
has a fluorescent pigment of red luminous color, when the first luminous material layer
7
is illuminated, the blue luminous color released from the luminous plane
1
is interfered by the red reflected light of the luminous color converting layer
9
, and a nearly white color is released from the luminous plane. It was thus difficult to obtain the original blue luminous color.
In particular, when such conventional multi-color emission-dispersion type EL lamp is used as the backlight of a translucent type liquid crystal display device, the translucent film of the translucent type liquid crystal display device reflects about 70% to about 90% of the light released from the multi-color emission-dispersion type EL lamp. Therefore, the reflected light is reflected to the luminous color converting layer in the multi-color emission-dispersion type EL lamp, and its reflected light is released to the liquid crystal display device side. Such reflection is repeated. As a result, the color interference is further promoted, and the problem becomes more manifest.
It is hence an object of the invention to present a multi-color emission-dispersion type EL lamp capable of suppressing color interference by reflected light due to other colored constituent materials, and obtaining a plurality of clear luminous colors from the luminous plane side.
SUMMARY OF THE INVENTION
T
Chikahisa Yosuke
Tanabe Koji
Matsushita Electric - Industrial Co., Ltd.
McDermott & Will & Emery
Negron Ismael
O'Shea Sandra
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