JP2004355961A - Light emitting panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emitting panel in which translucency and luminescence can be compatible. <P>SOLUTION: A light-emitting panel (EL panel) having a luminous membrane in which a transparent electrode layer (2), a luminous layer (3), an insulating layer (4), and a rear electrode (5) are laminated in the order has a portion on which the luminous membrane is formed (non-translucent portion 8) and a portion having no luminous membrane (translucent portion 9) dispersed in a row. By this arrangement, the translucent portions can be mixed with the luminous portions in dispersion, and thereby the translucency and luminescence can be made compatible. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a light emitting panel, and more particularly, to a light emitting panel applicable to a vehicle window glass.
[0002]
[Prior art]
For example, the entire light emitting layer is made to emit light by applying an electric field to a light emitting layer formed by printing light emitting ink obtained by mixing phosphor fine particles made of copper-doped zinc sulfide into a binder on a glass plate or a transparent organic film. Such an electroluminescence (EL) sheet is known (see Japanese Patent Application Laid-Open No. 2002-124391).
[0003]
[Patent Document 1]
JP-A-2002-124391 (page 3, paragraph number 0012, FIG. 1)
[0004]
[Problems to be solved by the invention]
Since the light emitting layer of the EL sheet is an extremely thin film but is opaque, it has been practically impossible to apply the light emitting layer to a site that requires lighting, such as a window glass of an automobile.
[0005]
The present invention has been devised to solve such a problem of the related art, and a main object of the present invention is to provide a light-emitting panel that can achieve both light transmission and light emission.
[0006]
[Means for Solving the Problems]
In order to achieve such an object, in the first aspect of the present invention, the transparent electrode layer (2), the light emitting layer (3), the insulating layer (4), and the back electrode layer (5) are sequentially laminated. A light-emitting panel (EL panel 1) having a light-emitting film formed by disposing a portion (light-transmitting portion 9) that is not formed with respect to a portion (light-transmitting portion 8) on which the light-emitting film is formed is dispersed. It was assumed that.
[0007]
In this way, it is possible to collect light from a portion where the film is not formed (the light-transmitting portion 9) which is dispersed and illuminate the portion where the light-emitting film is formed. it can.
[0008]
The invention according to claim 2 is characterized in that the portion where the film is not formed is a dot-like pattern. This makes it possible to easily set the area ratio between the light-transmitting portion and the light-emitting portion by setting the size and density of points.
[0009]
The invention according to claim 3 is characterized in that the film-formed portion is a linear pattern. Thus, the area ratio between the light transmitting portion and the light emitting portion can be easily set by setting the thickness of the line and the space between the line gaps.
[0010]
The invention according to claim 4 is characterized in that the light-emitting panel is glass for a vehicle (sunroof panel 13). Thereby, for example, it is possible to use the glass sunroof as a room light by illuminating the inner surface of the sunroof panel while securing the lighting property of the glass sunroof.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.
[0012]
FIG. 1 is a cross-sectional view showing a schematic structure of an EL sheet as a luminous body to which the present invention is applied. The EL sheet 1 is formed by sequentially laminating a transparent electrode layer 2, a light emitting layer 3, an insulating layer 4, and a back electrode layer 5, and is sandwiched between a pair of front and back plate glasses 6a and 6b. Enclosed in the form
[0013]
The transparent electrode layer 2 is formed of a thin film of a conductive polymer such as polyacetylene, polythiophene, and polypyrrole.
[0014]
The light emitting layer 3 is formed by, for example, applying a light emitting ink obtained by mixing and stirring fluorescent fine particles to a fluororesin binder on the surface of the transparent conductive film using, for example, a silk screen printing method.
[0015]
The insulating layer 4 is formed by, for example, mixing and stirring a high dielectric substance with a fluororesin binder on the film surface of the light emitting layer 3 in the same manner as the light emitting layer 3.
[0016]
The back electrode layer 5 is formed by laminating a carbon fine powder mixed with, for example, a polyester resin binder on the film surface of the insulating layer 4 in the same manner as the light emitting layer 3.
[0017]
By applying an alternating current to the transparent electrode layer 2 and the back electrode layer 5 via the inverter 7, the phosphor of the light emitting layer 3 is excited, so that the entire surface of the light emitting layer 3 emits light. ing.
[0018]
The print patterns P of the respective layers are made equal to each other, and as shown in FIGS. 2 and 3, the opaque portions 8 on which the respective inks are applied in an overlapping manner, and the hexagonal dots (dots) without the application of the inks. The light-transmitting portions 9 are formed in a white pattern and the light-transmitting portions 9 are dispersed uniformly over the entire printing surface, for example. By appropriately setting the size of the dots, the ratio of the area of the non-light-transmitting portion 8 to the area of the light-transmitting portion 9 as a light-emitting portion is changed, and accordingly, the amount of collected light and the amount of light emission are set appropriately. You can do it.
[0019]
Needless to say, the shape of the dot is not limited to the hexagon illustrated, but the opaque portion 8 needs to be continuous to the extent that current flows.
[0020]
If the panel configured as described above is applied to a sunroof panel 13 that opens and closes by sliding an opening 12 provided in a roof 11 of a vehicle shown in FIG. Can be emitted, so that it can be used as a room light capable of uniformly illuminating a room over a wide range. In addition, if a room light of a conventional type is used in combination as a spotlight, etc., the variety of indoor lighting can be expanded.
[0021]
The EL sheet has a drawback that it is weak against humidity and ultraviolet rays. However, if the EL sheet is sealed in an ultraviolet absorbing glass, for example, these weak points can be compensated.
[0022]
As illustrated in FIGS. 5 to 8, the pattern of the opaque portion 8 serving as the light emitting unit may be a combination of linear patterns such as a grid pattern or a stripe.
Also in this case, the amount of light to be collected and the amount of luminescence can be appropriately set by setting the thickness of the line and the space between the lines.
[0023]
Since the EL sheet 1 formed by sequentially laminating the transparent electrode layer 2, the light emitting layer 3, the insulating layer 4, and the back electrode layer 5 is made of an extremely thin film, the opaque portion 8 and the translucent portion 9 are formed. Can be formed not only by the above-mentioned printing pattern but also by, for example, forming a light-emitting surface on the entire sheet and cutting out only a portion of the sheet that is desired to transmit light by, for example, manufacturing a punching metal. It is.
[0024]
【The invention's effect】
As described in detail above, according to the present invention, a portion where a light emitting film is not formed is dispersedly arranged with respect to a portion where a light emitting film is formed (claim 1). It is possible to achieve both light transmission and light emission. In particular, if the portion where the film is not formed is a dot pattern (Claim 2) or the portion where the film is formed is a linear pattern (Claim 3), the area ratio between the light transmitting portion and the light emitting portion can be easily increased. Can be set to When this light-emitting panel is used for glass for vehicles (claim 3), it can be used as a room light by illuminating the inner surface of the glass while securing the light-collecting property from the glass surface. As described above, according to the present invention, a great effect can be obtained in expanding the adaptability of the EL sheet.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view showing the structure of an EL sheet. FIG. 2 is an example of a film forming pattern. FIG. 3 is another example of a film forming pattern. FIG. 4 is a perspective view of a main part of a vehicle with a sunroof to which the present invention is applied. FIG. 5: Another example of a film formation pattern. FIG. 6: Another example of a film formation pattern. FIG. 7: Another example of a film formation pattern. FIG. 8: Another example of a film formation pattern.
DESCRIPTION OF SYMBOLS 1 EL panel 2 Transparent electrode layer 3 Light emitting layer 4 Insulating layer 5 Back electrode layer 8 Non-light-transmitting part 9 Light-transmitting part 13 Sunroof panel

Claims (4)

A light-emitting panel having a light-emitting film in which a transparent electrode layer, a light-emitting layer, an insulating layer, and a back electrode layer are sequentially stacked,
A light-emitting panel, wherein a portion where the light-emitting film is not formed is dispersed with respect to a portion where the light-emitting film is formed. The light emitting panel according to claim 1, wherein the portion where the film is not formed is a dot pattern. The light-emitting panel according to claim 1, wherein the film-formed portion has a linear pattern. The light emitting panel according to any one of claims 1 to 3, wherein the light emitting panel is glass for a vehicle.

Images