JP2772679B2 - Full color EL panel - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a full-color EL panel.

[Conventional technology]

Usually, a thin film EL panel is, for example, a light emitting diode (LE
Compared with D), the performance is insufficient in terms of colorization and emission luminance. However, the thin-film EL panel has advantages that it is easy to increase the size and the cost per pixel is low. For this reason, in recent years, research institutes have been actively developing the development of full-color thin-film EL panels and improvement of the light emission luminance thereof. For example, in a ZnS-based EL, monochromatic light such as yellow-orange (Mn-doped), green (TbF3-doped), etc.
It is in the practical stage. In addition, red orange (SmF3 dope), yellow (Dy
Development of monochromatic light such as F3 dope, white (PrF3 dope), blue (TmF3 dope), green (ErF3 and HoF3 dope), and mixed color light thereof are also underway. By changing the magnitude of the applied voltage, in addition to the colorization by the operation of the activator,
Example of achieving red, yellow and green, and furthermore, EL tanks are stacked in two stages,
There have been reports of achieving mixed-color light. The actual colorization in the prior art will be described with reference to FIG. In the figure, a light emitting layer 4 includes a red (hereinafter R) light emitting layer (ZnS: Sm), a green (hereinafter G) light emitting layer (ZnS: Tb) and a blue (hereinafter B) which are three primary colors of light. Light-emitting layer (ZnS: C
e) and mosaic are arranged. These light emitting layers 4
Are the electrodes of the thin-film EL panel (transparent conductive film 2 (made of ITO in this example)) interposed in a grid pattern with the insulator 3 interposed therebetween.
And a voltage between the back electrode 5 (in this example, made of Al)
By mixing and emitting light, a desired color (that is, full color) is obtained.

[Problems to be solved by the invention]

As mentioned above, various announcements have been made on full-color thin-film EL panels. However, it is difficult to increase the emission luminance in full color to a practical stage.

SUMMARY OF THE INVENTION An object of the present invention is to provide a full-color EL panel having a high luminance that can be used practically, focusing on the above-mentioned conventional problems.

[Means for solving the problem]

In order to achieve the above object, the full color according to the present invention is used.
The EL panel will be described with reference to FIG.
Each of the species (R, G, B) has a configuration in which an ultraviolet-excited phosphor 6 emitting one of the three primary colors of light is interposed in a mosaic manner. Further, as shown in FIG. 2, in the thin-film EL panel, a white light emitting ultraviolet excitation phosphor 61 is interposed between the glass substrate 1 and the transparent conductive film 2, and the surface of the white light emitting ultraviolet excitation phosphor 61 is provided. , Three types (R, G,
B) Each of the filters 7 transmits one of the three primary colors of light.
May be arranged in a mosaic shape. Further, as shown in FIGS. 3 and 4, in the above two configurations,
The configuration “between the glass substrate 1 and the transparent conductive film 2” may be “on the back electrode 5”. In the above configuration, the light emitting layer 41 of the thin film EL panel may be made of ZnS: Gd.

[Action]

According to the above configuration, in FIGS.
The light emitting layer 41 of the thin film EL panel emits ultraviolet light.
Claim 4). In particular, when the light emitting layer is ZnS: Gd, the emission luminance of the ultraviolet excitation phosphor is remarkable (claim 4). Next, this ultraviolet light is applied to the ultraviolet-excited phosphor 6 (Claims 1 and 3) disposed at the lower portion (Claims 1 and 2) or the upper portion (Claim 3) of the thin-film EL panel. It is absorbed by the white-light-emitting ultraviolet-excited phosphor 61 (claims 2 and 3), and the luminescent center in the phosphor is excited to emit light in a color corresponding to each material. When the phosphor is an ultraviolet-excited phosphor 6, the emitted colors emit three primary colors of light (R, G, and B), and these are arranged in a mosaic pattern. In the description of the present invention, "mosaic"
It is a shape obtained by looking up or down looking at each drawing). Then, by applying a voltage to a desired electrode grid of the thin-film EL panel, the light-emitting layer 41 emits ultraviolet light, and the ultraviolet-excited phosphor 6 at the corresponding position emits light. Since the positions of the three primary colors (R, G, B) of light are known in advance,
By freely changing the position of the application electrode, it becomes possible to project a desired primary color or mixed color and a free color image based on the desired primary color or mixed color (that is, it is possible to achieve full color). On the other hand, when the phosphor is a white light emitting ultraviolet excitation phosphor 61, by applying a voltage to the electrode of the thin film EL panel, the light emitting layer 41 emits ultraviolet light, and the white light emitting ultraviolet excitation fluorescent The body 61 emits light.
However, since the white light emitting ultraviolet excitation phosphor 61 itself emits white light, which is a mixed color of the three primary colors of light, it is necessary to once divide it into each of the three primary colors of light. For this reason,
The red R, green G, and blue B filters 7 are arranged in a mosaic pattern above or below the white light emitting ultraviolet excitation phosphor 61 in the figure. Since the positional relationship of R, G or B of these filters 7 is known in advance, the desired primary colors or mixed colors can be freely changed by freely changing the voltage application positions of the electrode grids of the thin film EL panel. An image can be displayed (that is, full colorization can be achieved). Note that, of the above, the position of the filter 7 is not limited to the position adjacent to the white light emitting ultraviolet excitation phosphor 61. This may be anywhere, as described in the claims "corresponding to the surface of the white light emitting ultraviolet excitation phosphor 61". However, between the electrodes (2
It is not permissible only to place them anywhere in 5) and 5).

As can be seen from the above operation, the color tone can be finely changed by controlling the applied voltage in the above configuration.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, a thin film EL panel which is the basis of each embodiment will be described. This is shown in FIG. 1 to FIG.
The transparent conductive film 2 of the side electrode, the transparent insulating film 3, and the light emitting layer 41
And a transparent insulating film 3, a metal electrode 5 on the other side, and a protection film (not shown) for preventing mechanical damage. Although not shown, if each figure is viewed upward or downward, the electrode 2,
Numerals 5 are tens of lines each on the surface of the thin film EL panel, and are in a lattice shape orthogonal to each other.

According to the structure of the embodiment of claim 1, in the thin film EL panel having such a structure, as shown in FIG. 1, between the glass substrate 1 and the transparent conductive film 2, red R, green G and three primary colors of light, The blue-B ultraviolet-excited phosphors 6 are arranged in a mosaic pattern. In the fluorescent layer, red R is Y ₂ O ₃ : Eu, and green G is La ₂ O ₃ .0.2SiO _2.
0.9P ₂ O ₅ : Ce, Tb, blue B is Sr ₁₀ (PO ₄ ) ₆ Cl ₂ .nB ₂ O ₃ : Eu. Each of these ultraviolet-excited phosphors 6 is arranged vertically and horizontally,..., R, G, BR, G, B,.
And a mosaic-like configuration. In another embodiment, the ultraviolet-excited phosphor 6 has a red R of Y (P, V).
When O ₄ : Eu, green G is CeMgAl ₁₁ O ₁₉ : Tb,
The case where blue B is BaMg ₂ Al ₁₆ O ₂₇ : Eu can be cited. The three primary colors of light can be created by changing the combination of these materials. Next, the operation of the embodiment will be described. In the above configuration, when a voltage is applied to the desired electrode grids 2 and 5, the light emitting layer 41 at that portion emits ultraviolet light, and the ultraviolet excitation phosphor 6 at a position corresponding to this portion absorbs ultraviolet light and emits light. Huh. Therefore, by freely changing the position and range of the application electrode, it becomes possible to project a desired primary color or mixed color in a free image (that is, to achieve full color).

Next, in the embodiment of claim 2, in the above-mentioned thin film EL panel, as shown in FIG. 2, a white light emitting ultraviolet excitation phosphor 61 is interposed between the glass substrate 1 and the transparent conductive film 2,
In addition, a filter 7 in which each of the three types (R, G, B) transmits one of the three primary colors of light is arranged in a mosaic shape so as to correspond to the surface of the white light emitting ultraviolet excitation phosphor 61. Has become. That is, the white-light-emitting ultraviolet-excited phosphor 61 is made of the material of the phosphor layer of the embodiment of claim 1 (for R, Y ₂
For green G such as O ₃ : Eu or Y (P, V) O ₄ : Eu, La ₂ O ₃
・ 0.2SiO ₂・ 0.9P ₂ O ₅ : Ce, Tb or CeMgAl ₁₁ O ₁₉ : Tb, blue B, Sr ₁₀ (PO ₄ ) ₆ Cl ₂・ nB ₂ O ₃ : Eu or BaMg ₂ Al ₁₆ O
₂₇ : Eu etc.). Next, the operation of the embodiment will be described. In the above configuration, when a voltage is applied to a desired electrode grid of the thin-film EL panel, the light emitting layer 41 at that portion emits ultraviolet light, and the white light emitting ultraviolet excitation phosphor 61 at the corresponding position emits white light. Therefore, this is once divided into each of the three primary colors of light. For this reason, the white light emitting ultraviolet excitation phosphor 61 (lower part in the figure) is provided with red R, green G,
R, G, B, R, G, B
・ They are arranged in a mosaic pattern. These filters 7
And the positional relationship between the transmitted light R, G and B is known in advance, so that a color image with a desired primary color or mixed color can be projected by freely changing the voltage application position of the electrode grid of the thin film EL panel. Becomes possible. In addition, among the above, as shown in the figure, the position of the filter 7 is limited to the lower part of the illustrated white light emitting ultraviolet excitation phosphor 61 if it is a position other than between the electrodes (2 and 5). There is no.

Next, in the third embodiment, the ultraviolet-excited phosphor 6 is replaced with "on the back electrode 5" from the position "between the glass substrate 1 and the transparent conductive film 2" in the first embodiment. (FIG. 3). In the embodiment of the second aspect, the white light emitting ultraviolet excitation phosphor 61 and the filter 7 may be used.
Are replaced with “on the back electrode 5” from the position “between the glass substrate 1 and the transparent conductive film 4” (fourth embodiment).
Figure). The position of the filter 7 in the latter case may be any position other than between the electrodes (2 and 5) as described above.

Next, an embodiment of claim 4 is the same as the above embodiment,
The light emitting layer 41 of the thin film EL panel is made of ZnS: Gd.

To summarize the effects of this embodiment, the light emission luminance can be obtained according to the light emission luminance of the light emitting layer. As a result, a practical full-color EL panel is obtained. In particular, when the light emitting layer is ZnS: Gd, full-color light emission luminance is remarkable. In addition, as can be seen from the above operation, the hue can be finely changed by controlling the applied voltage.

〔The invention's effect〕

As described above, the full-color EL panel according to the present invention can have a practically high luminance.

[Brief description of the drawings]

FIG. 1 is a sectional view of a full-color EL panel according to an embodiment of the present invention. FIG. 2 is a sectional view of a full-color EL panel according to an embodiment of the present invention. FIG.... Cross-sectional view of a full-color EL panel according to a first embodiment of the present invention according to claim 3. FIG. 4. Cross-sectional view of a full-color EL panel according to a second embodiment of the present invention. Figure 1 Cross section of conventional color EL panel 1 Glass substrate 2 Transparent conductive film 41 Light-emitting layer 5 Back electrode 6 UV-excited phosphor 61 White-emitting UV-excited phosphor 7 ……filter

Claims (4)

(57) [Claims] In a thin-film EL panel, an ultraviolet-excited phosphor that emits one of three primary colors of light (R, G, B) is provided between a glass substrate and a transparent conductive film. A full-color EL panel featuring a mosaic structure. 2. In a thin-film EL panel, a white light emitting ultraviolet excitation phosphor 61 is interposed between a glass substrate 1 and a transparent conductive film 2 so as to correspond to the surface of the white light emitting ultraviolet excitation phosphor 61. 3. A full-color EL panel characterized in that filters (R, G, B) of three types, each of which transmits one of the three primary colors of light, are arranged in a mosaic pattern. 3. "Between glass substrate 1 and transparent conductive film 2"
3. The full-color EL panel according to claim 1 or 2, wherein “is above the back electrode 5”. 4. The full-color EL panel according to claim 1, wherein the light-emitting layer 41 of the thin-film EL panel is made of ZnS: Gd.